JP6445732B1 - Absorbent articles - Google Patents

Abstract

An object of the present invention is to improve the absorption performance while improving the feel of a surface sheet.
In an absorbent article, a top sheet (2) includes a first fiber layer (2a) containing water-retaining fibers, and a second fiber containing hydrophobic fibers and water-retaining fibers adjacent to the non-skin side of the first fiber layer. And a fiber layer 2b. The skin side surface of the first fiber layer constitutes the skin side surface of the top sheet. The ratio of the water retention fiber in the fibers constituting the first fiber layer is larger than the ratio of the water retention fiber in the fibers constituting the second fiber layer. The average fiber length of the water retention fibers of the second fiber layer is shorter than the average fiber length of the water retention fibers of the first fiber layer.
[Selection] Figure 2

Description

  The present invention relates to an absorbent article.

  As a surface sheet of an absorbent article, a sheet containing water-retaining fibers that absorb and retain moisture such as cotton fibers is known. For example, Patent Document 1 discloses a fiber sheet containing cotton fibers used as a surface sheet. This fiber sheet includes a cotton fiber layer and a synthetic fiber nonwoven fabric, and is formed in a state in which the cotton fiber layer partially enters the nonwoven fabric.

  In general, water-retaining fibers such as cotton fibers have a good touch, and are therefore suitably used for underwear that comes into contact with the skin. However, since cotton fibers have high water retention, when a sheet containing cotton fibers is used as a top sheet of an absorbent article, the top sheet absorbs liquid excretion (liquid excrement) excreted from the wearer. However, there is a possibility that the wet state is maintained. When this happens, the wearer may continue to contact the wet and damp surface sheet, which may cause discomfort. That is, when a sheet containing cotton fibers is used for the top sheet, there is a problem that the dryness is low.

  According to the description of Patent Document 1, the fiber sheet including the cotton fiber disclosed in Patent Document 1 has the following characteristics. In the fiber sheet, since the cotton fiber layer penetrates into the inside of the nonwoven fabric in the thickness direction, the fiber amount gradually increases from the cotton fiber layer toward the center of the fiber sheet in the thickness direction, that is, the interfiber distance gradually increases. Get smaller. As a result, the capillary force gradually increases from the cotton fiber layer toward the center in the thickness direction of the fiber sheet, and the drawability of the liquid from the cotton fiber layer to the inside of the sheet increases. Therefore, the dryness of the surface of the fiber sheet can be enhanced.

JP 2004-324038 A

  However, the fiber sheet containing the cotton fiber of Patent Document 1 has the following problems. The synthetic fiber layer located on the opposite side of the cotton fiber layer across the central portion in the thickness direction of the fiber sheet is a layer containing only synthetic fibers. Therefore, the fiber amount gradually decreases from the central portion in the thickness direction of the fiber sheet toward the synthetic fiber layer, that is, the inter-fiber distance gradually increases. As a result, the capillary force gradually decreases from the central portion in the thickness direction of the fiber sheet toward the synthetic fiber layer. Then, the fiber sheet can draw the liquid absorbed from the cotton fiber layer side to the central part in the thickness direction of the fiber sheet, but it is difficult to transfer to the synthetic fiber layer side. Therefore, when the fiber sheet is used as a surface sheet of an absorbent article, the surface sheet can draw liquid excretion excreted from the wearer from the cotton fiber layer to the center in the thickness direction, but in the thickness direction. It becomes difficult to shift from the central portion to the synthetic fiber layer. That is, it becomes difficult for liquid excrement to transfer from the top sheet to the absorbent body, and there is a possibility that the absorption performance of the absorbent article is reduced, for example, the absorption rate is reduced or the amount of absorption is reduced.

  The objective of this invention provides the absorbent article which can improve absorption performance, making the touch of a surface sheet favorable.

  The absorbent article of the present invention is as follows. (1) An absorbent article comprising a top sheet, a back sheet, and an absorbent body positioned between the top sheet and the back sheet, wherein the top sheet includes a water retention fiber. And a second fiber layer that is adjacent to the non-skin side of the first fiber layer and includes hydrophobic fibers and water retention fibers, and the skin side surface of the first fiber layer is formed of the top sheet. The water-retaining fiber of the fibers constituting the skin-side surface, the non-skin-side surface of the second fiber layer constituting the non-skin-side surface of the topsheet, and constituting the first fiber layer Is greater than the proportion of the water retaining fibers in the fibers constituting the second fiber layer, and the average fiber length of the water retaining fibers of the second fiber layer is the water retaining capacity of the first fiber layer. Absorbent articles that are shorter than the average fiber length of the reactive fibers.

In this absorbent article, since the ratio of the water retention fiber in the 1st fiber layer located in the skin side of a surface sheet is relatively high, the touch of a surface sheet can be made favorable. Moreover, since the average fiber length of the water-retaining fibers contained in the first fiber layer is relatively long, it is possible to suppress a situation in which the average fiber length is too short and the entanglement between the fibers is insufficient and fluff is generated. A decrease in the feel of the sheet can be suppressed.
At that time, since the average fiber length of the water retention fibers contained in the second fiber layer is shorter than the average fiber length of the water retention fibers contained in the first fiber layer, the fibers constituting the second fiber layer are closer to each other. Can be made. Therefore, since the average distance between the fibers of the second fiber layer can be shortened compared to the average distance between the fibers of the first fiber layer, capillary action can be more strongly generated in the second fiber layer, and the first fibers The liquid excretion excreted on the skin side surface of the layer can be quickly drawn into the second fiber layer. And the liquid excretion drawn in to the 2nd fiber layer can be made to move to an absorber via a 2nd fiber layer quickly with a hydrophobic fiber.
At that time, in the first fiber layer, the liquid excrement can be drawn into the second fiber layer while being widely diffused in the plane direction by the water retention fiber having a relatively long average fiber length. Thereby, since the liquid excrement diffused widely in the plane direction by the top sheet can be absorbed in a wide area in the plane direction in the absorber, the absorption performance can be enhanced.
Thereby, absorption performance can be improved, making the touch of a surface sheet favorable.

  In the absorbent article of the present invention, (2) an absorbent article comprising a top sheet, a back sheet, and an absorbent body positioned between the top sheet and the back sheet, the top sheet is water retaining A first fiber layer including a conductive fiber; and a second fiber layer adjacent to the non-skin side of the first fiber layer and including a hydrophobic fiber and a water retention fiber, the skin side of the first fiber layer The surface of the surface sheet constitutes the surface of the surface sheet on the skin side, the surface of the second fiber layer on the non-skin side constitutes the surface of the surface sheet on the non-skin side, and constitutes the first fiber layer. The ratio of the water-retaining fibers in the fibers is greater than the ratio of the water-retaining fibers in the fibers constituting the second fiber layer, and the fiber density of the first fiber layer is that of the second fiber layer. The absorbent article may be smaller than the fiber density. Here, the fiber density is the density of the number of fibers.

In this absorbent article, since the ratio of the water retention fiber in the 1st fiber layer located in the skin side of a surface sheet is relatively high, the touch of a surface sheet can be made favorable.
At that time, since the fiber density of the second fiber layer is higher than the fiber density of the first fiber layer, the fibers constituting the second fiber layer can be brought closer to each other. Therefore, since the average distance between the fibers of the second fiber layer can be shortened compared to the average distance between the fibers of the first fiber layer, capillary action can be more strongly generated in the second fiber layer, and the first fibers The liquid excretion excreted on the skin side surface of the layer can be quickly drawn into the second fiber layer. And the liquid excretion drawn in to the 2nd fiber layer can be made to move to an absorber via a 2nd fiber layer quickly with a hydrophobic fiber.
At that time, in the first fiber layer, the liquid excrement can be drawn into the second fiber layer while being widely diffused in the plane direction by the water retention fiber. Thereby, since the liquid excrement diffused widely in the plane direction by the top sheet can be absorbed in a wide area in the plane direction in the absorber, the absorption performance can be enhanced.
Thereby, absorption performance can be improved, making the touch of a surface sheet favorable.

The absorbent article of the present invention is (3) further comprising an auxiliary sheet having a fiber density higher than the fiber density of the second fiber layer between the top sheet and the absorbent body. Absorbent article.
Since this absorbent article further includes an auxiliary sheet having a fiber density higher than the fiber density of the second fiber layer, the liquid excretion drawn into the second fiber layer is stabilized in the auxiliary sheet by capillary action. Can be migrated. Thereby, the liquid excretion can be more stably transferred from the top sheet to the absorbent body via the auxiliary sheet, and thus the absorption performance can be improved while improving the touch of the top sheet.

The absorbent article of the present invention is any one of (1) to (3), wherein (4) the hydrophobic fibers included in the second fiber layer include heat-fusible fibers that are heat-bonded to each other. Or an absorbent article according to any one of the above.
In this absorbent article, in the second fiber layer, the heat-fusible fibers are heat-bonded to each other, so that the shape of the second fiber layer can be stably maintained. Therefore, even if the average fiber length of the water-retaining fibers contained in the second fiber layer is relatively short, the water-retaining fibers can be stably held without unevenness among the hydrophobic fibers. Thereby, the liquid excretion drawn into the second fiber layer can be stably transferred to the absorbent body without unevenness, and the absorption performance can be improved.

In the absorbent article of the present invention, (5) at least a part of the heat-fusible fiber of the second fiber layer is exposed on the skin side surface of the first fiber layer. The absorbent article described may be used.
In the present absorbent article, the water retaining fiber of the first fiber layer is present in the first fiber layer so that a part of the heat-fusible fiber of the second fiber layer is exposed on the surface of the first fiber layer. Can be stably held between the heat-fusible fibers. Thereby, even if the average distance between the fibers of the first fiber layer is relatively long and the strength of the first fiber layer is relatively weak, it is possible to suppress the sagging. Further, by holding the water retaining fibers of the first fiber layer between the heat-fusible fibers, it becomes possible to suppress fuzzing. Thereby, the touch of the first fiber layer can be improved. In addition, since a part of the heat-fusible fiber having no water retention in the second fiber layer is present in the first fiber layer, the first fiber layer to the second fiber layer via the heat-fusible fiber. The transfer of liquid excreta to can be promoted. Thereby, liquid excretion can be stably transferred to an absorber.

The absorbent article of the present invention has (6) a pressing part in which the topsheet and the absorbent body are compressed in the thickness direction of the absorbent article, and the heat-fusible property of the second fiber layer. The absorbent article according to (4) or (5) above, wherein at least a part of the fiber is exposed on the inner surface of the pressing portion.
In the present absorbent article, a part of the heat-fusible fiber of the second fiber layer is present in the first fiber layer so as to be exposed on the inner surface of the squeezed part, whereby the first fiber layer in the squeezed part. The water retaining fiber can be stably held between the heat-fusible fibers. Thereby, even if the intensity | strength of the 1st fiber layer in a pressing part is relatively weak, it can suppress that it sags and fuzzs, and can improve the touch of the 1st fiber layer in a pressing part. Moreover, the 1st fiber in the pressing part via a heat-fusible fiber exists in the 1st fiber layer in a pressing part because a part of heat-fusible fiber which does not have the water retention in a 2nd fiber layer exists. It is possible to promote the transfer of liquid excreta from the layer to the second fiber layer. Thereby, liquid excretion can be more stably moved to an absorber.

In the absorbent article of the present invention, (7) the pressing part includes a low density part having a shallow depth in the thickness direction of the absorbent article and a high density part having a deep depth in the thickness direction of the absorbent article. And at least a part of the heat-fusible fiber of the second fiber layer is exposed on the surface of the low-density part. Good.
In the present absorbent article, a part of the heat-fusible fiber of the second fiber layer is present in the first fiber layer so as to be exposed on the surface of the low-density part, whereby the first fiber layer in the low-density part. The water retaining fiber can be stably held between the heat-fusible fibers. Thereby, even if the intensity | strength of the 1st fiber layer in a low density part is comparatively weak, it can suppress that it becomes sagging and fuzzing, and can improve the touch of the 1st fiber layer in a low density part. . In addition, since a part of the heat-fusible fiber having no water retention in the second fiber layer is present in the first fiber layer in the low-density part, the first part in the low-density part through the heat-fusible fiber is used. Migration of liquid excreta from the first fiber layer to the second fiber layer can be promoted. Thereby, the liquid excretion can be finally transferred to the absorber more stably.

In the absorbent article of the present invention, (8) the top sheet extends along a longitudinal direction of the absorbent article, and has a plurality of protrusions positioned at intervals in the width direction of the absorbent article; A plurality of concave portions extending between adjacent convex portions extending in the longitudinal direction of the adhesive article, wherein the top sheet has a fiber density of S1, and the bottom portion of the concave portion has fibers. Any of (1) to (7) above, where S1 is S2 and S3 is the fiber density of the region between the top of the convex part and the bottom of the concave part, S1 <S3 <S2. Or an absorbent article according to any one of the above.
In the absorbent article according to claim 8, in the surface sheet, the fiber density passes through the region between the top of the convex part with a low fiber density and the top part of the convex part with a medium fiber density and the bottom part of the concave part. Capillary action works toward the bottom of the dense recess. Therefore, the liquid excretion excreted on the surface closest to the skin (the top of the convex portion or the vicinity thereof) in the top sheet can be more easily drawn into the bottom of the concave portion located in the vicinity of the non-skin side surface in the top sheet. Thereby, the liquid excretion can be more stably transferred from the skin-side surface of the topsheet to the absorbent body via the non-skin-side surface of the topsheet. Moreover, the liquid excrement once absorbed can be made difficult to rewet back by the gradient of the fiber density. Furthermore, since the fiber density of a convex part is low, a wearer can feel softness. Therefore, the absorption performance can be improved while making the surface sheet feel good.

In the absorbent article of the present invention, (9) in the top sheet, the first fiber layer and the second fiber layer are compressed in the thickness direction of the absorbent article in each of the plurality of recesses. The absorbent article according to (8) above, which has a plurality of depressions.
In the present absorbent article, the first fiber layer and the second fiber layer are squeezed and fixed to each other in the plurality of depressions, and thus the water retention fibers of the first fiber layer are compressed. Thereby, the fuzz of a water retention fiber can be suppressed and the touch of a surface sheet can be maintained favorable.

In the absorbent article of the present invention, (10) the average fiber length of the hydrophobic fibers of the second fiber layer is longer than the average fiber length of the water retention fibers of the first fiber layer and the second fiber layer. The absorbent article according to any one of (1) to (9) above may be used.
In the present absorbent article, the average fiber length of the hydrophobic fibers of the second fiber layer is longer than the average fiber length of the water retention fibers of the first fiber layer and the second fiber layer. Therefore, at least a part of the hydrophobic fibers of the second fiber layer can reach the inside of the first fiber layer. Thereby, the liquid excrement of the first fiber layer can be more easily transferred to the second fiber layer, and the liquid excretion transferred to the second fiber layer can be more easily transferred to the absorber. it can.

The absorbent article of this invention is (11) The said water retention fiber contained in the said surface sheet is a cellulosic fiber, The said absorber contains a cellulosic fiber (except a pulp fiber), and is contained in the said surface sheet. The absorbent article according to any one of (1) to (10), wherein a part of the cellulosic fiber is in contact with the cellulosic fiber contained in the absorber. .
In the present absorbent article, cellulosic fibers having high liquid diffusibility are communicated from the first fiber layer of the topsheet to the absorber through the second fiber layer. Therefore, the liquid excrement can be directly diffused from the top sheet to the absorber by utilizing the liquid diffusion of the liquid excretion by the cellulosic fiber. Thereby, absorption performance can be improved.

In the absorbent article of the present invention, (12) the fibers constituting the topsheet are longer in the widthwise direction of the topsheet than in the widthwise center of the topsheet. The absorbent article according to any one of (1) to (11) above, which is oriented in a direction.
In this absorbent article, the fiber orientation of the top sheet is random in the center, so that liquid excrement can be evenly diffused concentrically and the fiber orientation is oriented in the longitudinal direction at both ends. By doing so, the liquid excrement reaching both ends can be diffused in the longitudinal direction. That is, the absorbent article can be used as a whole, and the absorption performance can be improved. Moreover, since the number of fibers exposed from the edge decreases at both ends of the surface sheet, friction to the skin is reduced, and a decrease in touch can be suppressed.

The absorbent article of the present invention is (13) the absorbent article according to any one of (1) to (12) above, wherein the water retention fiber contained in the top sheet is cotton. Good.
In the present absorbent article, since the water retention fiber is cotton, it is possible to maintain or improve the absorption performance while making the surface sheet feel better.

The absorbent article of the present invention further includes (14) an auxiliary sheet positioned between the top sheet and the absorber, and the width direction dimension of the top sheet is the width direction dimension of the auxiliary sheet. The absorbent article according to any one of (1) to (13), which is smaller than the above.
When the edge of the surface sheet containing a large amount of water-retaining fibers is rubbed, the water-retaining fibers are easily released from the edges and easily fall off. Therefore, in the present absorbent article, the dimension in the width direction of the auxiliary sheet is larger than the dimension in the width direction of the top sheet containing a large amount of water retaining fibers. That is, in a plan view, a pair of extending portions are formed outside the both end edges in the width direction of the top sheet in the auxiliary sheet. Therefore, the force received by the absorbent article from the thigh of the wearer can be received by the pair of extending portions at both ends in the width direction of the auxiliary sheet, Can be made difficult to rub. Thereby, it can suppress that the both-ends edge of the width direction of a surface sheet rubs, and a water retaining fiber can be released from the both-ends edge of the width direction of a surface sheet, and can fall, and the fall of the touch can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can improve absorption performance can be provided, making the touch of a surface sheet favorable.

It is a top view which shows the structural example of the absorbent article which concerns on embodiment. It is sectional drawing which follows the II-II line | wire of FIG. It is the top view and sectional drawing which show the structural example of the surface sheet which concerns on embodiment. It is a schematic diagram which shows the structural example of the manufacturing apparatus of the absorbent article which concerns on embodiment. It is sectional drawing explaining the manufacturing method of the absorbent article which concerns on embodiment.

  The absorbent article according to the embodiment will be described using a sanitary napkin as an example. However, the type and use of the absorbent article of the present invention are not limited to the examples, and can be applied to other absorbent articles without departing from the scope of the subject matter of the present invention. Examples of other absorbent articles include panty liners, light incontinence pads, and disposable diapers.

(First embodiment)
1-2 is a figure which shows the structural example of the sanitary napkin 1 which concerns on embodiment. FIG. 1 is a plan view showing a state in which the sanitary napkin 1 is unfolded, FIG. 2 (a) is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2 (b) is FIG. FIG. The sanitary napkin 1 of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other. In the sanitary napkin 1 depicted in FIG. 1, the upper side and the lower side in the drawing are the front side and the rear side in the longitudinal direction L, respectively, the left side and the right side are the left side and the right side in the width direction W, respectively, And the rear side are the upper side and the lower side in the thickness direction T, respectively. The sanitary napkin 1 has a longitudinal center line C _L (virtual line) extending in the longitudinal direction L through the center in the width direction W and a width direction center line C _W (imaginary line) extending in the width direction W through the center in the longitudinal direction L. Line). Longitudinal center line C _L-going direction and sides were respectively inward and inside in the width direction W, the outward and outer away orientation and a side each width direction W. On the other hand, the direction and the side toward the width direction center line _CW are respectively inward and inner in the longitudinal direction L, and the direction and the side away from each other are respectively outward and outward in the longitudinal direction L. Viewing the sanitary napkin 1 placed on a plane including the longitudinal direction L and the width direction W from above the thickness direction T is referred to as “planar view”, and the shape grasped in plan view is referred to as “planar shape”. An arbitrary direction in a plane including the longitudinal direction L and the width direction W is referred to as a “plane direction”. When the wearer put on the sanitary napkin 1 is worn, the side that is relatively close to and far from the wearer's skin surface in the thickness direction T is defined as “skin side” and “non-skin side”. That's it. These definitions are commonly used for each material of the sanitary napkin 1.

  In the present embodiment, the sanitary napkin 1 (excluding the wing portion) has a substantially rectangular shape that is long in the longitudinal direction L and short in the width direction W, and both end edges in the longitudinal direction L have a substantially semicircular shape in plan view. . However, the shape is not particularly limited as long as it is long in the longitudinal direction L and short in the width direction W, and examples thereof include a rounded rectangle, an ellipse, an hourglass shape, and similar shapes. The sanitary napkin 1 includes a wing portion 9 that extends outward in the width direction W from a substantially rectangular portion, and the wing portion 9 has a substantially trapezoidal shape. However, the shape of the wing part 9 may be, for example, a semicircular shape or a semi-elliptical shape.

  In the present embodiment, the sanitary napkin 1 includes a top sheet 2 that constitutes the skin-side surface of the sanitary napkin 1, a back sheet 3 that constitutes the non-skin-side surface of the sanitary napkin 1, and a top sheet 2. And an absorber 4 disposed between the back sheet 3 and the back sheet 3. In the present embodiment, the sanitary napkin 1 further includes an auxiliary sheet 5 and a pair of side sheets 6 and 6. The auxiliary sheet 5 is disposed so as to overlap the non-skin side of the top sheet 2. Each of the pair of side sheets 6 and 6 is joined to each of both end portions in the width direction W on the non-skin side of the auxiliary sheet 5 so that end portions on the inner side in the width direction W overlap each other. It is extended. Therefore, in this embodiment, the absorber 4 is located between the top sheet 2, the auxiliary sheet 5, and the pair of side sheets 6 and 6 and the back sheet 3. However, an exterior sheet may be provided on the non-skin side of the back sheet 3.

  The top sheet 2 is a liquid-permeable sheet and includes a first fiber layer 2a and a second fiber layer 2b. The skin side surface of the first fiber layer 2 a constitutes the skin side surface of the top sheet 2. The second fiber layer 2b is adjacent to the non-skin side of the first fiber layer 2a. In the present embodiment, the non-skin side surface of the second fiber layer 2b constitutes the non-skin side surface of the top sheet 2, and thus the top sheet 2 has a two-layer structure. However, the second fiber layer 2b may include one or a plurality of fiber layers on the non-skin side, and thus the surface sheet 2 may have a three-layer or multilayer structure as a whole.

The first fiber layer 2a contains water retention fibers.
The water retention fiber is not particularly limited as long as it has a property of absorbing and retaining moisture (water retention property). Examples of the water retention fiber include cellulosic fibers. The cellulosic fiber is not particularly limited as long as it is a fiber containing cellulose, and examples thereof include natural cellulose fiber, regenerated cellulose fiber, purified cellulose fiber, and semi-synthetic cellulose fiber. Examples of natural cellulose fibers include plant fibers such as seed hair fibers (example: cotton), bark fibers (example: hemp), vein fibers (example: Manila hemp), and fruit fibers (example: palm). Examples of cotton include hirssum cotton (eg, Upland cotton), barbadense cotton, arborium cotton, and herbaum cotton. The cotton may be organic cotton or pre-organic cotton (trademark). However, the organic cotton means cotton that has been certified by GOTS (Global Organic Textile Standard). Examples of the regenerated cellulose fiber include fibers such as rayon, for example, viscose rayon obtained from viscose, polynosic and modal, copper ammonia rayon obtained from a copper ammonia salt solution of cellulose (also referred to as “cupra”), and the like. . As refined cellulose fiber, lyocell, specifically, pulp is dissolved in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope and extruded into a dilute solution of N-methylmorpholine N-oxide. The thing made into the fiber is mentioned. Purified cellulose is commercially available, for example, as Tencel (trademark). Semi-synthetic cellulose fibers include semi-synthetic cellulose, for example, acetate fibers such as triacetate and diacetate. Among these, from the viewpoints of water retention and touch, natural cellulose fibers are preferred, cotton is more preferred, and Hiltzum seed cotton is even more preferred. In the present embodiment, the water-retaining fiber is hirutsusum cotton (hereinafter also simply referred to as “cotton”).

The second fiber layer 2b includes hydrophobic fibers and water retention fibers.
The hydrophobic fiber is not particularly limited as long as it is a fiber having hydrophobicity. Examples of hydrophobic fibers include thermoplastic resin fibers. The thermoplastic resin fiber is not particularly limited as long as it is a fiber containing a thermoplastic resin. Examples of the thermoplastic resin include olefin resins such as polyethylene (PE), polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA), and polyester resins such as polyethylene terephthalate (PET) and polylactic acid (PLA). Known resins such as resins and polyamide-based resins such as 6-nylon may be mentioned, and these resins may be used alone or in combination of two or more kinds. Further, the structure of the fiber made of such a thermoplastic resin is not particularly limited. For example, a composite fiber such as a core-sheath type fiber, a side-by-side type fiber, an island / sea type fiber; a hollow type fiber; Non-uniform cross-section type fibers such as flat, Y-shaped and C-shaped; three-dimensional crimped fibers of latent crimp or actual crimp; split fibers divided by physical load such as water flow, heat, embossing, etc. The fibers having a structure may be used alone or two or more kinds of fibers may be used in combination. In the present embodiment, the hydrophobic fiber is a PET / PE core-sheath type composite fiber. The water retention fiber is the same as the water retention fiber of the first fiber layer 2a. “Hydrophobic” refers to the property that it is difficult to adjust to water or to retain moisture. For example, the contact angle with ion-exchanged water (example: specific resistance value 10 MΩ · cm) is 80 ° to 100 °. It is something that becomes a degree.

  In the 1st fiber layer 2a and the 2nd fiber layer 2b, the ratio of the water retention fiber in the fiber which comprises the 1st fiber layer 2a is from the ratio of the water retention fiber in the fiber which comprises the 2nd fiber layer 2b. There are many. Thereby, at least the touch of the surface sheet 2 can be made favorable. Furthermore, in the 1st fiber layer 2a and the 2nd fiber layer 2b, the average fiber length of the water retention fiber of the 2nd fiber layer 2b is shorter than the average fiber length of the water retention fiber of the 1st fiber layer 2a. Thereby, at least the fibers constituting the second fiber layer 2b can be brought closer to each other, that is, the distance between the fibers can be shortened, and the capillary phenomenon can be caused more strongly, so that the liquid excrement can be strongly drawn. Specifically, for example, as shown below.

  70-100 mass% is preferable from a viewpoint of raising the touch of the surface sheet 2, and the ratio of the water retention fiber of the fibers which comprise the 1st fiber layer 2a is more preferable, and 80-100 mass% is 90-100 mass. % Is more preferable. Since it becomes easy for a wearer to recognize the 1st fiber layer 2a as a water retention fiber by setting it as 70 mass% or more, the good touch feeling can be ensured. Of the fibers constituting the first fiber layer 2a, the fibers other than the water retention fibers are not particularly limited as long as they can form a liquid-permeable layer, and examples thereof include thermoplastic resin fibers. In this embodiment, the ratio of the water retention fiber is 100% by mass.

  The fineness of the water retention fiber of the first fiber layer 2a is not particularly limited, and examples thereof include 0.8 to 15 dtex. As for the fiber length of the water retention fiber of the 1st fiber layer 2a, 10-80 mm is mentioned, for example. When the length is less than 10 mm, the fiber length is too short and it becomes difficult for the fibers to be entangled with each other, and sufficient strength may not be obtained. If it exceeds 80 mm, some of such fibers may extend in the width direction W, resulting in bridging the fibers from the wearer's thigh edge to the other thigh edge, In that case, the liquid excretion adhering to the central part in the width direction W of the sanitary napkin 1 may diffuse to both thighs due to the diffusion effect of the liquid of the water retention fiber, which may cause discomfort to the wearer. . The fiber length is preferably 15 to 60 mm, and more preferably 20 to 40 mm. Correspondingly, the average fiber length of the water retention fibers of the first fiber layer 2a is, for example, 15 to 50 mm, preferably 20 to 45 mm, and more preferably 25 to 40 mm.

  In addition, the latitude, fiber length, and average fiber length of the fibers other than the water retention fiber in the first fiber layer 2a are also the same as those of the water retention fiber (0.5 to 2) from the viewpoint of not adversely affecting the feel of the water retention fiber. In the range of 2 times). However, in this embodiment, fibers other than the water retention fiber are not used.

  If the ratio of the water retention fiber of the fiber which comprises the 2nd fiber layer 2b is less than the ratio of the water retention fiber of the 1st fiber layer 2a, it will not restrict | limit in particular. As a ratio of water retention fiber, 50-90 mass% is mentioned, for example. When the amount is less than 50% by mass, the touch feeling may be reduced when pressure is applied in the thickness direction. When it exceeds 90 mass%, there exists a possibility that the effect which prevents the fluff by a hydrophobic fiber may fall. 60-85 mass% is preferable and, as for the ratio of a water retention fiber, 70-80 mass% is more preferable. Correspondingly, the ratio of the hydrophobic fibers in the second fiber layer 2b is, for example, 10 to 50% by mass, preferably 15 to 40% by mass, and more preferably 20 to 30% by mass. The second fiber layer 2b may include a third fiber in addition to the water retention fiber and the hydrophobic fiber.

The fineness of the water retention fiber of the second fiber layer 2b is not particularly limited, and examples thereof include 0.8 to 15 dtex. If the average fiber length is shorter than the average fiber length of the water retention fiber of the 1st fiber layer 2a, the fiber length of the water retention fiber of the 2nd fiber layer 2b will not be restrict | limited, For example, 3-40 mm will be mentioned. When the length is less than 3 mm, the fiber length is too short to make it difficult to interlace the fibers, and sufficient strength cannot be obtained. If it exceeds 40 mm, the dynamic freedom of the fibers in the web state during the production of the second fiber layer 2b is low, and the water retention fibers cannot enter the gaps between the hydrophobic fibers, and as a result, the second fiber layer It becomes difficult to shorten the distance between the fibers in 2b, and thus it is difficult to increase the fiber density. As fiber length of the water retention fiber of the 2nd fiber layer 2b, 5-35 mm is preferred and 10-35 mm is more preferred. Correspondingly, the average fiber length of the water retention fibers of the second fiber layer 2b is, for example, 5 to 30 mm, preferably 10 to 25 mm, and more preferably 15 to 20 mm.
Furthermore, a mixed water-retaining fiber obtained by mixing at least two types of water-retaining fibers having a fiber length falling in the above range and having a long fiber length and a water-retaining fiber having a short fiber length can also be used. As an example, a water-retaining fiber having a long fiber length is, for example, 15 to 40 mm (preferably 20 to 35 mm), and a water-retaining fiber having a short fiber length is, for example, 3 to 25 mm (preferably 5 to 20 mm). Can be long. In this case, the interfiber distance of the second fiber layer 2b can be increased with the water-retaining fiber having a short fiber length while the water retention property and the touch in the second fiber layer 2b are increased with the water-retaining fiber having a long fiber length.

The latitude of the hydrophobic fiber of the second fiber layer 2b is not particularly limited, and examples thereof include 1.1 to 8.8 dtex. However, the ease of entanglement between the hydrophobic fibers of the second fiber layer 2b and the water retention fibers that are the main fibers of the first fiber layer 2a, that is, the ease of transfer of liquid excreta from the first fiber layer 2a From the viewpoint of preventing peeling between the first fiber layer 2a and the second fiber layer 2b, the latitude of the hydrophobic fibers of the second fiber layer 2b is more than the fineness of the water retention fibers of the first fiber layer 2a. It is preferable that it is small (thin fiber diameter).
Moreover, the fiber length in particular of the hydrophobic fiber of the 2nd fiber layer 2b is not restrict | limited, For example, 10-80 mm is mentioned. However, the ease of entanglement between the hydrophobic fibers of the second fiber layer 2b and the water retention fibers that are the main fibers of the first fiber layer 2a, that is, the ease of transfer of liquid excreta from the first fiber layer 2a From the viewpoint of preventing peeling between the first fiber layer 2a and the second fiber layer 2b, the fiber length of the hydrophobic fibers of the second fiber layer 2b is the water retention of the first fiber layer 2a and the second fiber layer 2b. It is preferable that the length is longer than the fiber length of the conductive fiber. Correspondingly, the average fiber length of the hydrophobic fibers of the second fiber layer 2b is, for example, 15 to 50 mm.

  Each thickness of the 1st fiber layer 2a and the 2nd fiber layer 2b is not restrict | limited in particular, For example, 0.05-4 mm is mentioned, 0.1-3 mm is preferable and 0.2-2 mm is more preferable. However, from the viewpoint of improving the feel of the first fiber layer 2a and suppressing the rewet back to the wearer's skin, the thickness of the first fiber layer 2a is relatively thick, and the second fiber layer 2b It is preferable that the thickness is relatively thin. Moreover, the thickness in particular of the surface sheet 2 is not restrict | limited, For example, 0.1-5 mm is mentioned, 0.4-4 mm is preferable and 0.8-3 mm is more preferable.

However, the ratio of the kind of fiber in a sheet like a fiber layer is measured as follows.
That is, the ratio of the kind of fiber is measured by coloring the water retaining fiber and the hydrophobic fiber with different colors. (1) The top sheet 2 is cut into a size of 70 mm × 70 mm to obtain a sample. (2) By carrying out a coloring process with the reagent Kaystein Q (Color Dye Co., Ltd.), only the water retaining fiber is dyed blue and only the hydrophobic fiber is colored yellow. (3) By measuring the ratio of blue and yellow when viewed from the skin side surface (first fiber layer 2a) of the sample with a digital microscope VHX-100 manufactured by Keyence Corporation, in a range of 50 mm x 50 mm, It is set as the ratio of the kind of fiber in the 1st fiber layer 2a. On the other hand, by measuring the ratio of blue and yellow when viewed from the non-skin surface (second fiber layer 2b) in a range of 50 mm × 50 mm, the ratio of the types of fibers in the second fiber layer 2b is obtained.

  Moreover, the distance between the fibers in a sheet such as a fiber layer is measured according to the following measuring method. (1) The top sheet 2 is cut into a size of 10 mm × 10 mm to obtain a sample. (2) Using a digital microscope VHX-100 (lens VH-Z20R + variable illumination attachment VH-K20) manufactured by Keyence Co., Ltd., an imaging magnification: 200 times, a measurement area: 1300 μm in length × 1735 μm in width, a surface sheet Images are taken from the front surface (first fiber layer 2a) and the back surface (second fiber layer 2b). At that time, images are taken a total of five times for each 20 μm depth in the range of 0-100 μm depth for each of the front and back surfaces. (3) The area of the part where no fiber is present is determined from each of the obtained images. At that time, the presence / absence of fibers in the imaging region in each image is determined by determining the presence / absence of fibers in each pixel based on whether the luminance at each pixel in the obtained images is lower or higher than a predetermined luminance (threshold). Determine. However, light is transmitted only in a portion where no fiber is present and bright, that is, the luminance is increased. Thereby, the area of the region where no fiber exists in the imaging region is obtained. (4) The void ratio is calculated by subtracting the calculated area of the region where there is no fiber from the area of the imaging region (measurement area) and dividing by the area of the imaging region (measurement area). The calculation is performed for each image having a depth of 20 μm, and five void ratios are calculated. (5) By calculating the average of the five porosity, the porosity of each of the surface (first fiber layer 2a) and the back surface (second fiber layer 2b) of the topsheet 2 is determined. By comparing the porosity, the size of the interfiber distance can be determined. That is, when the porosity is large, it can be seen that the interfiber distance is large. For example, the porosity of the surface of the top sheet 2, that is, the skin surface side (first fiber layer 2 a: for example, the surface of Cotton 100%) is 25.4%, and the back surface, that is, the non-skin surface side (second fiber layer 2 b: for example, In the case of Cotton 60% + synthetic fiber 40%, the porosity was 24.5%.

  Further, the fiber length and the average fiber length of the fiber of the sheet such as the fiber layer are determined in accordance with “A7.1.1 A method (standard method)” of “A7.1 Measurement of fiber length” in Annex A of JIS L 1015: 2010. ) "Measurement method according to the method of measuring the length of individual fibers on a graduated glass plate". The above method is a test method corresponding to ISO 6989 issued in 1981.

  Moreover, the basic weight of a sheet | seat like a fiber layer is measured in accordance with the following measuring methods. A fiber layer for one layer is prepared, the fiber layer is cut into a size of 5 cm × 5 cm, and used as a sample, and the mass is measured after drying in an atmosphere of 100 ° C. or higher. Next, the basis weight of the sample is calculated by dividing the measured mass by the area of the sample. A value obtained by averaging the basis weights of 10 samples is defined as the basis weight of the sheet.

  The thickness of the sheet such as the fiber layer is measured according to the following measuring method. An enlarged image is taken from a direction perpendicular to the cut surface of the top sheet 2 using a digital microscope VHX-100 manufactured by Keyence Corporation. The magnified image is an image that has been magnified so that the entire surface sheet 2 in the thickness direction T can be photographed, and the magnification is, for example, 20 to 50 times. In the 2D image converted from the obtained 3D image, the thickness of each fiber layer is measured. The average value of the thicknesses measured at three different cut surfaces is taken as the thickness of the topsheet 2.

As described above, in the sanitary napkin 1, the ratio of the water-retaining fibers in the first fiber layer 2a located on the skin side of the topsheet 2 is relatively high, so that the touch of the topsheet 2 can be improved. . In addition, since the average fiber length of the water retention fibers contained in the first fiber layer 2a is relatively long, the average fiber length is too short, and the situation where fluff occurs due to insufficient entanglement between fibers can be suppressed, A decrease in the touch of the top sheet 2 can be suppressed.
At that time, since the average fiber length of the water retention fibers included in the second fiber layer 2b is shorter than the average fiber length of the water retention fibers included in the first fiber layer 2a, the fibers constituting the second fiber layer 2a are You can get closer to each other. Therefore, since the average distance between the fibers of the second fiber layer 2b can be shortened compared to the average distance between the fibers of the first fiber layer 2a, the capillary phenomenon can be caused more strongly in the second fiber layer 2b. The liquid excretion excreted on the skin side surface of the first fiber layer 2a can be quickly drawn into the second fiber layer 2b. And the liquid excrement drawn in to the 2nd fiber layer 2b can be rapidly moved to the absorber 4 via the 2nd fiber layer 2b with a hydrophobic fiber.
At that time, in the first fiber layer 2a, the liquid excrement can be drawn into the second fiber layer 2b while being widely diffused in the plane direction by the water retention fibers having a relatively long average fiber length. Thereby, since the liquid excrement diffused widely in the plane direction by the surface sheet 2 can be absorbed in a wide region in the plane direction of the absorber 4, the absorption performance can be enhanced.
By these, the absorption performance of the sanitary napkin 1 can be improved while making the surface sheet 2 feel good.

  In addition, when the second fiber layer 2b includes one or a plurality of fiber layers on the non-skin side, that is, when the surface sheet 2 has a three-layer or multi-layer structure as a whole, from the viewpoint of further improving liquid permeability, It is preferable that the fiber layer closer to the non-skin side surface of the topsheet 2 has a relatively low ratio of water retention fibers and a short average fiber length of the water retention fibers.

In the present embodiment, the fiber density of the first fiber layer 2a is smaller than the fiber density of the second fiber layer 2b. That is, there is a fiber density gradient so that the fiber density increases from the first fiber layer 2a to the second fiber layer 2b.
In the sanitary napkin 1 having such a configuration, first, the liquid excretion excreted on the skin-side surface of the topsheet 2, that is, the surface of the first fiber layer 2a when worn is drawn into the first fiber layer 2a. Can do. Thereafter, the liquid excrement drawn into the first fiber layer 2a can be stably transferred to the second fiber layer 2b due to the gradient of the fiber density. Thereby, from the 1st fiber layer 2a containing relatively much water retention fiber, the layer (2) which touches the non-skin side of the 2nd fiber layer 2b via the 2nd fiber layer 2b containing relatively few water retention fiber ( Example: Liquid excreta can be stably transferred to the auxiliary sheet, absorber 4). Therefore, absorption performance can be improved, making the surface sheet 2 feel good. The top sheet 2 of the sanitary napkin 1 may not have such a fiber density gradient.
However, when one or more fiber layers are further provided on the non-skin side surface of the second fiber layer 2b, that is, when the top sheet 2 has a three-layer or multilayer structure, the non-skin side surface of the top sheet 2 It is preferable that the fiber layer closer to the fiber density is relatively high. Thereby, the liquid permeability from the fiber layer on the skin side to the fiber layer on the non-skin side can be further increased, and liquid excrement can be more stably transferred to the auxiliary sheet or the absorbent body 4.

  However, when the second fiber layer 2b includes one or a plurality of fiber layers on the non-skin side, that is, when the top sheet 2 has a three-layer or multilayer structure as a whole, the non-skin side of the top sheet 2 The fiber layer closer to the surface preferably has a relatively high fiber density. Thereby, the liquid permeability from the fiber layer on the skin side to the fiber layer on the non-skin side can be further increased, and liquid excrement can be more stably transferred to the auxiliary sheet or the absorbent body 4.

In addition, the fiber density of a sheet | seat like a fiber layer is measured with the following measuring methods, for example.
(1) The top sheet 2 is cut into a size of 10 mm × 10 mm to obtain a sample. (2) The cut surface parallel to the thickness direction T of the sample is enlarged and observed using a scanning electron microscope (JEOL Ltd .: JCM-5100). The magnification is a magnification (example: 150 to 500 times) at which a cross section of 30 to 60 fibers can be measured within one screen. (3) The observation area is divided into three in the thickness direction T into a skin-side layer, an intermediate layer, and a non-skin-side layer, and the skin-side layer is defined as the first fiber layer 2a. Then, the number of cross-sections of the fibers in each fiber layer is measured. That is, the number of cross-sections of the cut fibers is counted on a cut surface having a predetermined area. (4) The number of cross sections of the obtained fiber is converted into the number of cross sections of the fiber per 1 mm ² , and this is defined as the fiber density (lines / mm ² ). Measurement is performed at three locations, and the average value of the measured values is defined as the fiber density of the sample. That is, the density of the number of fibers is used as the fiber density. In other words, the number of fibers per unit area in a cross section parallel to the thickness direction T is used as the fiber density. The number of fibers per unit volume may be used as the fiber density. The number of fibers per unit volume can be determined, for example, by analysis using X-ray CT. Although the numerical value is different between the fiber density per unit area and the fiber density per unit volume, the fiber density between the fiber layers is the same in the relative comparison (example: large and small comparison).

In the present embodiment, the hydrophobic fibers included in the second fiber layer 2b include heat-fusible fibers that are heat-bonded to each other. That is, the heat-fusible fiber contained in the hydrophobic fiber has a joint point (fusion point) where the heat-fusible fibers are joined to each other by heat fusion at a place where the heat-fusible fibers are in contact with each other. Such heat-bonding fibers bonded to each other can be regarded as forming a kind of matrix of thermoplastic resin fibers in the second fiber layer 2b.
In the sanitary napkin 1 having such a configuration, the shape of the second fiber layer 2b can be stably held by the heat-fusible fibers that are heat-fused to each other in the second fiber layer 2b. Therefore, even if the average fiber length of the water-retaining fibers contained in the second fiber layer 2b is relatively short, the water-retaining fibers can be stably held without being biased between the heat-fusible fibers (in the matrix). Thereby, the liquid excretion drawn into the 2nd fiber layer 2b can be transferred to the absorber 4 (and auxiliary sheet 5) stably without unevenness, and absorption performance can be improved. In addition, the hydrophobic fiber of the sanitary napkin 1 may not include such heat-fusible fibers that are heat-bonded to each other.

In the present embodiment, at least a part of the heat-fusible fiber of the second fiber layer 2b is exposed on the skin side surface of the first fiber layer 2a. That is, the heat-fusible fiber of the second fiber layer 2b maintains the shape of the second fiber layer 2b stably, and at least a part thereof continuously from the second fiber layer 2b to the first fiber layer 2a. Intrusion further reaches the skin side surface of the first fiber layer 2a.
In the sanitary napkin 1 having such a configuration, the heat-fusible fiber of the second fiber layer 2b continuously extends into the first fiber layer 2a, whereby the water retention fiber of the first fiber layer 2a. Can be stably held between the heat-fusible fibers. Thereby, even if the average distance between the fibers of the first fiber layer 2a is relatively long and the strength of the first fiber layer 2a is relatively weak, it is possible to suppress the sagging. Further, by holding the water retaining fibers of the first fiber layer 2a between the heat-fusible fibers, it becomes possible to suppress fuzz. Thereby, the touch of the 1st fiber layer 2a can be improved. In addition, since a part of the heat-fusible fiber having no water retention property in the second fiber layer 2b is present in the first fiber layer 2a, the first fiber layer 2a through the heat-fusible fiber is used. It is possible to promote the transfer of liquid excrement to the two-fiber layer 2b. Thereby, liquid excretion can be stably moved to absorber 4 (and auxiliary sheet 5). The heat-fusible fiber of the second fiber layer 2b of the sanitary napkin 1 may not be exposed on the surface of the first fiber layer 2a.

In the present embodiment, the fibers constituting the topsheet 2 are oriented in the longitudinal direction L of the topsheet 2 at both ends in the widthwise direction W of the topsheet 2 rather than in the center of the topsheet 2 in the width direction W. doing. That is, in the width direction W, in the topsheet 2, the fibers in the central portion have a relatively small orientation in the longitudinal direction L, and the fibers at both ends have a relatively large orientation in the longitudinal direction L.
In the sanitary napkin 1 having such a configuration, since the fiber orientation of the top sheet 2 is relatively random at the center, liquid excreta can be diffused substantially concentrically, and the fiber orientation is at the longitudinal direction L at both ends. Therefore, the liquid excrement reaching both ends can be diffused in the longitudinal direction L. That is, the sanitary napkin 1 can be used as a whole, and the absorption performance can be improved. Moreover, since the number of fibers exposed from the edge decreases at both ends in the width direction W of the surface sheet 2, friction to the skin is reduced, and a decrease in touch can be suppressed. In addition, as for the fiber orientation of the surface sheet 2 of the sanitary napkin 1, the orientation of the longitudinal direction L does not need to be relatively large at both ends in the width direction W.

  In the sanitary napkin 1, the excretory opening contact area XA is set at the center in the longitudinal direction L slightly in front of the center in the width direction W in plan view. The excretion opening contact area XA is an area that faces or contacts the wearer's excretion opening when the sanitary napkin 1 is worn. The excretory opening contact area XA is set according to the type and application of the absorbent article. The excretory opening contact area XA is, for example, about 1/4 to 1/2 of the entire length in the longitudinal direction L of the absorbent body 4 in the longitudinal direction L and slightly in front of the absorbent body 4 in the width direction W. In the approximate center of the absorber 4, the width of the absorber 4 is set to about 1/2 to 1/3 of the entire length in the width direction W.

  In the present embodiment, the sanitary napkin 1 includes a pair of pressing portions (squeezing grooves) 12 and 12 that are continuously or intermittently positioned on both outer sides in the width direction W of the excretory opening contact area XA. In the present embodiment, the sanitary napkin 1 further includes a pair of squeezing parts (squeezing grooves) 13 and 13 behind the pair of squeezing parts 12 and 12 in the longitudinal direction L, and the length of the excretory opening contact area XA. Squeezed portions (squeezed grooves) 11 and 14 are provided in the front and rear in the direction L, respectively, and a plurality of dotted squeezed portions 15 are provided in the excretory opening contact area XA. The pressing parts 11 to 15 are formed by compressing the top sheet 2 and the absorbent body 4 in the thickness direction T. That is, the top sheet 2, the auxiliary sheet 5, and the absorbent body 4 (skin-side core wrap 4 b and absorbent core 4 a) are pressed in the thickness direction T to be formed. At that time, each squeezing part is weakly squeezed and formed at a shallow position, and the fiber density is relatively low, and the squeezed part is strongly squeezed and formed at a deep position, and the fiber density is relatively high. It has a high density part HPA. However, the criteria of “shallow” and “deep” are the skin-side surface of the topsheet 2. It can be said that the low density part LPA and the high density part HPA are the bottom part of the shallow position and the bottom part of the deep position in each pressing part. The low density part LPA and high density part HPA of the pressing parts 11-15 are located in the absorptive core 4a. However, the high density part HP may reach the core wrap 4b on the non-skin side. In addition, the shape of the pressing parts 11-15 is arbitrary. In addition, the sanitary napkin 1 does not need to be provided with at least one pressing part 11-15.

In this embodiment, at least one part of the heat-fusible fiber of the 2nd fiber layer 2b is exposed to the surface inside the pressing part in at least one of the pressing parts 11-15.
In the sanitary napkin 1 having such a configuration, since the heat-fusible fiber is present in the first fiber layer 2a so as to be exposed on the inner surface of the pressing part, the first fiber layer 2a is also formed in the pressing part. The water retaining fiber can be stably held between the heat-fusible fibers. Thereby, even if the intensity | strength of the 1st fiber layer 2a is relatively weak also in the pressing part, it can suppress that it becomes sagging and fuzzing, and the touch of the 1st fiber layer 2a in a pressing part can be made better. it can. In addition, since a part of the heat-fusible fiber having no water retention in the second fiber layer 2b is present in the first fiber layer 2a in the pressing part, the second part in the pressing part via the heat-fusible fiber is used. Migration of liquid excreta from the first fiber layer 2a to the second fiber layer 2b can be promoted. Thereby, liquid excretion can be more stably moved to absorber 4 (and auxiliary sheet 5). In the sanitary napkin 1, the heat-fusible fiber may not be exposed on the inner surface of the pressing portion.

In the present embodiment, at least a part of the heat-fusible fiber of the second fiber layer 2b is exposed on the surface of the low-density part LPA of the compressed part in at least one of the compressed parts 11-15.
In the sanitary napkin 1 having such a configuration, the heat-fusible fiber is present in the first fiber layer 2a so as to be exposed on the surface of the low-density part LPA, whereby the first fiber layer in the low-density part LPA. The water-retaining fiber 2a can be stably held between the heat-fusible fibers. Thereby, even if the intensity | strength of the 1st fiber layer 2a in the low density part LPA is relatively weak, it can suppress that it becomes sagging and fuzzing, and the touch of the 1st fiber layer 2a in the low density part LPA is improved. be able to. Further, a part of the heat-fusible fiber having no water retention in the second fiber layer 2b is present in the first fiber layer 2a in the low-density portion LPA, so that the low-temperature through the heat-fusible fiber is reduced. Migration of liquid excretion from the first fiber layer 2a in the density part LPA to the second fiber layer 2b can be promoted. Thereby, a liquid excretion can be finally moved to the absorber 4 (and auxiliary sheet 5) more stably. In the sanitary napkin 1, the heat-fusible fiber may not be exposed on the surface of the low density portion LPA.

  In the present embodiment, the top sheet 2 has an uneven structure. FIG. 3 shows a configuration example of the topsheet 2 according to the embodiment, FIG. 3A is a plan view of the topsheet 2, and FIG. 3B is a cross section taken along line IIb-IIb in FIG. FIG. The first fiber layer 2a has a first upper surface 2aE on the upper side in the thickness direction T and a lower first lower surface 2aF, and the second fiber layer 2b is on the lower side with the second upper surface 2bE on the upper side in the thickness direction T. The second lower surface 2bF. The first lower surface 2aF and the second upper surface 2bE are virtual boundaries between both fiber layers, but some of the fibers in both fiber layers are not strict boundaries because they enter each other by interlacing. The first fiber layer 2a extends continuously along the longitudinal direction L on the first upper surface 2aE, and continuously along the longitudinal direction L, with a plurality of convex portions 21 positioned at intervals in the width direction W. A plurality of recesses 22 extending between the adjacent protrusions 21. In the present embodiment, each of the plurality of convex portions 21 is formed solid. Since each of the plurality of convex portions 21 is formed solid in this way, each convex portion 21 is not easily crushed and the liquid is transferred from each convex portion 21 that is easily in contact with the wearer's body to the absorbent body 4. Since it is excellent in the property, the dryness of the surface of each convex part 21 can be improved.

  The 2nd fiber layer 2b is a substantially flat shape except the hollow part 23 (after-mentioned) formed by pressing. However, the second upper surface 2bE may be slightly raised upward in the thickness direction T at a position corresponding to the convex portion 21. In addition, the 2nd fiber layer 2b is continuously extended along the longitudinal direction L to the 2nd lower surface 2bF similarly to the 1st fiber layer 2a (however, it is thickness direction T reverse direction), and is space | interval in the width direction W There may be a plurality of convex portions that are spaced apart from each other, and a plurality of concave portions that extend continuously along the longitudinal direction L and are positioned between adjacent convex portions. In that case, it is preferable that the position of the convex part 21 and the recessed part 22 of the 1st fiber layer 2a and the position of the convex part and recessed part of the 2nd fiber layer 2b are the same by planar view.

  The first fiber layer 2a and the second fiber layer 2b are joined to each other by entanglement. Examples of the entanglement method include a spunlace method and a water jet method. However, the confounding method is not limited to this example, and other confounding methods such as an air through method may be used.

In the present embodiment, the fiber density of the top portion 21T of the convex portion 21 is S1, the fiber density of the bottom portion 22B of the concave portion 22 is S2, and the region MP between the top portion 21T of the convex portion 21 and the bottom portion 22B of the concave portion 22 When the fiber density is S3, S1 <S3 <S2.
In the sanitary napkin 1 having such a configuration, the top sheet has a dense fiber density S3 from the top portion 21T of the convex portion 21 having a sparse fiber density S1 through a region MP having a medium fiber density S2. Capillary action works toward the bottom 22 </ b> B of the recess 22. Therefore, the bottom 22B of the recessed part 22 located in the vicinity of the non-skin side surface in the surface sheet 2 is the liquid excretion excreted on the most skin side surface (the top 21T of the convex part 21 or the vicinity thereof) in the top sheet 2. It can be easily pulled in. Thereby, the liquid excretion can be more stably transferred from the skin side surface of the top sheet 2 to the absorbent body 4 (and the auxiliary sheet 5) via the non-skin side surface of the top sheet 2. Further, the liquid excrement once absorbed can be made difficult to rewet back by the above-described fiber density gradient (S1 <S3 <S2). Furthermore, since the fiber density of the convex part 21 is low, a wearer can feel softness. Therefore, the absorption performance can be improved while making the surface sheet feel good. In addition, the sanitary napkin 1 does not need to have said uneven structure in the surface sheet 2, and does not need to have said fiber density gradient.

In the present embodiment, the topsheet 2 has a plurality of indentations 23 in which the first fiber layer 2a and the second fiber layer 2b are compressed in the thickness direction T in each of the plurality of recesses 22. The plurality of depressions 23 are arranged intermittently along the longitudinal direction L in each recess 22 and at equal intervals or non-equal intervals. The recess 23 may be at the same position in the longitudinal direction L or not at the same position in the recesses 22 adjacent in the width direction W. In the present embodiment, the concave portions 22 are arranged in a checkered pattern. Further, the shape of the recess 23 in plan view is arbitrary such as an ellipse.
In the sanitary napkin 1 having such a configuration, the first fiber layer 2 and the second fiber layer 2b are fixed by pressing in the thickness direction T in the plurality of depressions 23. Fiber is compressed. Thereby, the fuzz of a water retention fiber can be suppressed and the touch of a surface sheet can be maintained favorable. In addition, the sanitary napkin 1 does not need to be provided with the hollow part 23 in the surface sheet 2. FIG.

  In the present embodiment, the auxiliary sheet 5 is a liquid-permeable sheet. Examples of the auxiliary sheet 5 include liquid permeable nonwoven fabrics and woven fabrics, and composite sheets thereof. The auxiliary sheet 5 has a slightly larger shape in the width direction W than the top sheet 2. The auxiliary sheet 5 has a pair of loop portions 5L and 5L at both ends in the width direction W. In the pair of loop portions 5L and 5L, both side portions in the width direction W of the auxiliary sheet 5 are folded in a loop shape inside the width direction W of the auxiliary sheet 5 and on the non-skin side (below the thickness direction T). Is formed. The end portions on both sides of the folded auxiliary sheet 5 are a pair of adhesive portions (not shown) that extend intermittently or continuously along the longitudinal direction L to a pair of inner end portions facing the pair of side sheets 6, 6. )). The loop portion 5L does not include an elastic member. Further, the end portions of both sides of the folded auxiliary sheet 5 are joined to the non-skin side surface of the auxiliary sheet 5 by a pair of adhesive portions extending intermittently or continuously along the longitudinal direction L.

  In the surface sheet 2 containing a large amount of water-retaining fibers according to the present embodiment, when the edge is rubbed, the water-retaining fibers are easily released from the edge and easily fall off. Here, in this embodiment, the dimension of the auxiliary sheet 5 in the width direction W is larger than the dimension of the top sheet 2 in the width direction W. That is, in plan view, portions of the auxiliary sheet 5 outside the both end edges in the width direction W of the top sheet 2 extend outward in the width direction W to form a pair of extending portions. In the present embodiment, a pair of loop portions 5L and 5L are formed at both ends of the auxiliary sheet 5 in the width direction W as the pair of extending portions. Thereby, the force which sanitary napkin 1 receives from a wearer's thigh can be received by a pair of loop parts 5L and 5L (a pair of extension parts), and both ends of the width direction W of surface sheet 2 are large. It is possible to make it difficult to rub the thigh. Thereby, it can suppress that the both-ends edge of the width direction W of the surface sheet 2 rubs, and a water retention fiber can be released from the both-ends edge of the width direction W of the surface sheet 2, and can fall, and the fall of the touch can be suppressed. In particular, when a pair of loop portions 5L and 5L is used as a pair of extending portions, the force received by the sanitary napkin 1 from the wearer's thigh is softly received by the cushioning action of the pair of loop portions 5L and 5L. It is possible to improve the feel of the wearer. In particular, when the water-retaining fiber is cotton, those effects are remarkable.

  In the present embodiment, the auxiliary sheet 5 has a fiber density higher than that of the second fiber layer 2b. In the sanitary napkin 1 having such a configuration, the liquid excrement drawn into the second fiber layer 2b can be stably transferred by the auxiliary sheet 5 by capillary action. Thereby, a liquid excretion can be more stably transferred from the surface sheet 2 to the absorber 4 via the auxiliary sheet 5, and the absorption performance can be improved while improving the touch of the surface sheet 2. Further, when the fiber density of the first fiber layer 2a <the fiber density of the second fiber layer 2b <the fiber density of the auxiliary sheet 5, the liquid excrement is further stabilized in the auxiliary sheet 5 due to capillary action. This is preferable because it can be shifted. The sanitary napkin 1 may not include the auxiliary sheet 5 or the loop portion 5L.

  In the present embodiment, the auxiliary sheet 5 includes water retaining fibers corresponding to the surface sheet 2, and when the surface sheet 2 includes cellulosic fibers (preferably cotton), cellulosic fibers (preferably cotton) are included. It is preferable to include. In the sanitary napkin 1 having such a configuration, the water-retaining fiber having high liquid diffusibility, preferably cellulosic fiber, and more preferably cotton is formed from the first fiber layer of the top sheet 2 through the second fiber layer to the auxiliary sheet 5. To communicate. Therefore, the liquid excrement can be more stably transferred from the surface sheet 2 to the absorber 4 through the auxiliary sheet 5 by utilizing the liquid diffusion of the liquid excrement by these fibers, and the touch of the surface sheet 2 Can improve the absorption performance. In the sanitary napkin 1, the auxiliary sheet 5 may not contain water-retaining fibers, cellulosic fibers, or cotton. In this case, as the auxiliary sheet 5, for example, a nonwoven fabric of hydrophobic fibers is used, and among them, a nonwoven fabric of thermoplastic resin fibers is publicly used.

  The absorber 4 is a layer having liquid absorption performance and liquid retention performance. In the present embodiment, the absorbent body 4 is long in the longitudinal direction L in plan view, and both end portions in the longitudinal direction L have a substantially semicircular shape. In the present embodiment, the absorbent body 4 includes an absorbent core 4a and a core wrap 4b that covers the absorbent core 4a. Examples of the absorbent core 4a include a liquid-retaining substance containing water-absorbing fibers such as pulp fibers and a water-absorbing material such as a superabsorbent polymer (SAP). Examples of the core wrap 4b include a liquid-permeable sheet including a hydrophilic nonwoven fabric such as a tissue.

In the present embodiment, when the topsheet 2 includes cellulosic fibers (preferably cotton), the absorbent body 4 preferably includes cellulosic fibers (preferably cotton) corresponding to the topsheet 2. In that case, it is preferable that a part of the cellulosic fibers contained in the surface sheet 2 is in contact with the cellulosic fibers contained in the absorbent body 4.
In the sanitary napkin 1 having such a configuration, cellulosic fibers having high liquid diffusibility are passed through the first fiber layer 2a to the second fiber layer 2b of the top sheet 2 (in some cases, via the auxiliary sheet 5). It communicates to the absorber 4. Therefore, the liquid excrement can be directly diffused from the top sheet 2 to the absorber 4 by utilizing the liquid diffusion of the liquid excretion by the cellulosic fiber. Thereby, absorption performance can be improved. In the sanitary napkin 1, the absorbent body 4 may not contain cellulosic fibers or cotton.

  In the present embodiment, the side sheet 6 is a water-repellent sheet. Examples of the side sheet 6 include a nonwoven fabric subjected to water repellent treatment and a synthetic resin film having air permeability. In the present embodiment, the back sheet 3 is a liquid-impermeable sheet. Examples of the back sheet 3 include liquid-impermeable nonwoven fabrics, synthetic resin films, and composite sheets thereof. In the present embodiment, the wing portion 9 is formed by the side sheet 6 and the back sheet 3.

  In the sanitary napkin 1 of the present embodiment, the top sheet 2 is joined to the auxiliary sheet 5 with an adhesive (eg, hot melt adhesive), and faces the absorber 4 in the auxiliary sheet 5 and the pair of side sheets 6 and 6. The portion is bonded to the absorbent body 4 with an adhesive. The portions of the pair of side sheets 6 and 6 and the absorber 4 that face the back sheet 3 are joined to the back sheet 3 with an adhesive or the like.

  In the present embodiment, the sanitary napkin 1 further includes a plurality of adhesive portions 7 and a pair of adhesive portions 8 and 8. The plurality of adhesive portions 7 have, for example, a substantially rectangular shape, and are arranged on the non-skin side surface of the back sheet 4 so as to overlap the absorber 4 in plan view, continuously extending in the longitudinal direction L, and in the width direction. Lined up W intermittently. The pair of adhesive portions 8, 8 have, for example, a substantially rectangular shape, and are arranged on the non-skin side surface of the back sheet 4 so as to overlap the pair of wing portions 9, 9 in plan view, and are continuous in the longitudinal direction L. Extended. Examples of the adhesive portions 7 and 8 include hot melt adhesives.

  Next, an example of a method for manufacturing the sanitary napkin 1 according to the present embodiment will be described.

  FIG. 4 is a schematic diagram illustrating a configuration example of a manufacturing apparatus 300 for the sanitary napkin 1. FIG. 5 is a diagram schematically illustrating a method for manufacturing the sanitary napkin 1. The manufacturing apparatus 300 has a conveyance direction MD, a transverse direction CD, and a vertical direction TD regarding conveyance of materials such as sheets and semi-finished products. In the present embodiment, the longitudinal direction, the width direction, and the thickness direction of the material and the semi-finished product are all the same as the transport direction MD, the transverse direction CD, and the vertical direction TD.

First, the second card web 110 forms the second fiber web P11 corresponding to the second fiber layer 2b. The first card machine 110 is a dry roller card using a single card or a double card generally used for forming a fiber web. The second fiber web P11 includes water retention fibers and hydrophobic fibers. The second fiber web P11 is transported in the transport direction MD by a transport device (not shown).
Next, a first fiber web P12 corresponding to the first fiber layer 2a is formed by the second card machine 120. The second card machine 120 is also a dry roller card similar to the first card machine 110. The first fiber web P12 contains water retention fibers. The 1st fiber web P12 is laminated | stacked on the 2nd fiber web P11 currently conveyed with a conveying apparatus. Thereby, the composite fiber web P13 having a two-layer structure in which the first fiber web P12 and the second fiber web P11 are laminated is formed and conveyed in the conveyance direction MD by the conveyance device. In addition, the ratio of each fiber in each fiber web is controllable by the ratio of the raw material fiber supplied to each card machine.

  Next, the composite fiber web P13 having a two-layer structure is subjected to water jet processing by the water jet processor 130, and the fibers are entangled. Thereby, the 1st continuous sheet (spun lace nonwoven fabric) P14 is formed. Here, in the water jet treatment, the composite fiber web P13 is placed on a continuously moving mesh belt, and a high-pressure jet water stream is jetted from the upper surface side of the composite fiber web P13 to interlace the fibers. The properties of the first continuous sheet P14 obtained by the water jet treatment can be appropriately adjusted and changed according to the mass of each fiber web, the hole diameter of the injection nozzle, the number of holes (pitch) of the injection nozzle, the passing speed of the fiber web, and the like. . Thereafter, the first continuous sheet P <b> 14 that has passed through the water jet processor 130 is dried by the dryer 140. The dried first continuous sheet P15 is transported in the transport direction MD by the transport device.

  In addition, the formation method of the fiber web corresponding to each fiber layer is not limited to the above-mentioned method, For example, you may employ | adopt a wet method etc. Further, the web joining method is not limited to the above-described method, and for example, a hydroentanglement method or a needle punch method may be employed. In addition, the first continuous sheet P15 is manufactured in a manufacturing plant different from the manufacturing plant of the sanitary napkin 1 and wound around a roll, and then supplied to the manufacturing plant of the sanitary napkin 1 in a roll state. Also good.

  Next, the first continuous sheet P16 which is the first continuous sheet P15 conveyed by a conveying device (not shown) or rewound from a roll (not shown) is shaped while being conveyed in the conveying direction MD. Supplied to the apparatus 210. Here, the shaping apparatus 210 is provided with shaping rolls 210a and 210b having concavo-convex portions extending in the circumferential direction and meshing with each other on the outer peripheral surface. And the 1st continuous sheet P16 is clamped by the uneven | corrugated | grooved part of the shaping rolls 210a and 210b, and the uneven structure extended in the conveyance direction MD is shaped. Thereafter, the first continuous sheet P16 is conveyed in the conveyance direction MD. Thereby, the continuous surface sheet P16 for the surface sheet 2 is formed.

  Next, the continuous auxiliary sheet AS for the auxiliary sheet 5 unwound from the material roll WR3 is supplied to the heating device 220 while being conveyed in the conveyance direction MD. Next, the continuous auxiliary sheet AS is supplied to the coating apparatus 302 after being subjected to heat treatment to recover the bulk. Then, the continuous auxiliary sheet AS is coated with an adhesive (eg, hot melt adhesive) in a predetermined pattern (eg, spiral pattern) on one surface. Thereafter, the continuous auxiliary sheet AS and the continuous surface sheet P16 are supplied to the bonding apparatus 230 while being conveyed in the conveyance direction MD, and are sandwiched and bonded between the pair of bonding rolls 230a and 230b of the bonding apparatus 230. Thereby, as shown to Fig.5 (a), the continuous surface sheet P17 is formed.

  Next, the continuous surface sheet P17 is supplied to the coating device 303 while being conveyed in the conveyance direction MD. Then, the continuous surface sheet P17 has an adhesive (for example, hot melt bonding) along the conveying direction MD on the lower surface of the continuous surface sheet P17 (continuous auxiliary sheet AS) in the vertical direction TD and at the end in the transverse direction CD. Agent) is applied in a predetermined pattern. Next, the continuous surface sheet P17 is supplied to the loop forming device 240 while being conveyed in the conveyance direction MD. Then, both end portions in the transverse direction CD of the continuous auxiliary sheet AS of the continuous surface sheet P17 are folded back in a loop shape toward the central portion by a folding jig such as a sailor of the loop forming device 240. As a result, a pair of side portions ASL and ASL corresponding to the pair of loop portions 5L and 5L are formed on both sides of the continuous surface sheet P17 in the transverse direction CD. Thereby, as shown in FIG.5 (b), the continuous surface sheet P18 is formed.

  Next, the continuous side sheet SS for the side sheet 6 unwound from the material roll WR4 is supplied to the cutting device 250 while being conveyed in the conveyance direction MD. Then, the continuous side sheet SS is cut into two equal parts in the transverse direction CD along the conveying direction MD at the center position in the transverse direction CD to form a pair of continuous side sheets SSa and SSb adjacent to the transverse direction CD. Is done. Thereafter, the pair of continuous side sheets SSa and SSb are supplied to the pair of coating devices 303a and 303b. Each of the pair of continuous side sheets SSa and SSb is coated with an adhesive (example: hot melt adhesive) in a predetermined pattern (example: stripe pattern) at the inner end in the transverse direction CD. Next, the pair of continuous side sheets SSa and SSb and the continuous surface sheet P8 are supplied to the joining device 260 while being transported in the transport direction MD, and are sandwiched between the pair of joining rolls 260a and 260b of the joining device 260, Be joined. Thereby, a pair of side part ASL and ASL and a pair of continuous side sheet | seat SSa and SSb in the continuous surface sheet P18 are joined, respectively. Thereby, as shown in FIG.5 (c), the continuous surface sheet P2 is formed.

  Next, the continuous surface sheet P2 is supplied to the coating device 305, and an adhesive (for example, hot melt adhesive) is applied in a predetermined pattern on the surface near the pair of continuous side sheets SSa and SSb. Next, the continuous surface sheet P2 and the absorbent body P3 arranged in the transport direction MD at a predetermined interval are supplied to the joining device 270 while being transported in the transport direction MD. And continuous surface sheet P2 and absorber P3 are pinched between a pair of joining rolls 270a and 270b of joining device 270, and are joined. Thereby, the semi-finished product P4 is formed. Subsequently, the semi-finished product P4 is supplied to the pressing device 280 while being transported in the transport direction MD. In the pressing device 280, an embossing roll 280a having a convex portion for pressing on the outer peripheral surface and an anvil roll 280b are disposed facing each other. And the semi-finished product P4 is pinched between the embossing roll 280a and the anvil roll 280b, and is squeezed. As a result, pressing parts 11 to 15 extending from the continuous surface sheet P2 to the absorbent body P3 in the vertical direction TD are formed, thereby forming a semi-finished product P5. In addition, each pressing part may be compressed with a mutually different pressing device. Next, the continuous back sheet BS for the back sheet 3 is supplied from the fourth material roll WR4 to the bonding apparatus 290 while being transported in the transport direction MD. An adhesive (for example, hot melt adhesive) is applied to one surface of the continuous back sheet BS by a coating device 306. On the other hand, the semi-finished product P5 is supplied to the bonding apparatus 290 while being transported in the transport direction MD. Then, the continuous back sheet BS and the semi-finished product P5 are sandwiched and bonded between the pair of bonding rolls 290a and 290b of the bonding apparatus 290. Thereby, as shown in FIG.5 (d), the semi-finished product P6 by which the continuous back surface sheet BS and the semi-finished product P5 were laminated | stacked on the up-down direction TD is formed. Thereafter, the release sheet CT (adhesive portions 7, 8) with the adhesive is joined to the semi-finished product P6, and the peripheral portion of the semi-finished product P6 to which the release sheet CT is joined is cut into the shape of the sanitary napkin 1, A napkin 1 is formed.

  The sanitary napkin 1 is manufactured as described above.

  However, as a method of interlacing the composite fiber web P13 having a two-layer structure, an air-through method may be used. That is, the composite fiber web P13 is conveyed to a heating device, and the fibers of the composite fiber web P13 are entangled with the heated air in the heating device.

(Second Embodiment)
Hereinafter, differences between the sanitary napkin 1 of the second embodiment and the sanitary napkin 1 of the first embodiment will be mainly described. The sanitary napkin 1 of the present embodiment is different from the sanitary napkin 1 of the first embodiment in that the fiber density of the first fiber layer 2a is smaller than the fiber density of the second fiber layer 2b. That is, in the sanitary napkin 1 of the present embodiment, there is a fiber density gradient so that the fiber density increases from the first fiber layer 2a toward the second fiber layer 2b. Here, the fiber density is the density of the number of fibers.

In the sanitary napkin 1 having such a configuration, since the fiber density of the second fiber layer 2b is higher than the fiber density of the first fiber layer 2a, the fibers constituting the second fiber layer 2b can be brought closer to each other. it can. Therefore, since the average distance between the fibers of the second fiber layer 2b can be shortened compared to the average distance between the fibers of the first fiber layer 2a, the capillary phenomenon can be caused more strongly in the second fiber layer 2b. The liquid excretion excreted on the skin side surface of the top sheet 2, that is, the surface of the first fiber layer 2a when worn can be drawn into the first fiber layer 2a. And the liquid excrement drawn in to the 2nd fiber layer 2b can be rapidly moved to the absorber 4 via the 2nd fiber layer 2b with a hydrophobic fiber. Thereby, from the 1st fiber layer 2a containing relatively much water retention fiber, the layer (2) which touches the non-skin side of the 2nd fiber layer 2b via the 2nd fiber layer 2b containing relatively few water retention fiber ( Example: Liquid excreta can be stably transferred to the auxiliary sheet, absorber 4).
At that time, in the first fiber layer 2a, the liquid excrement can be drawn into the second fiber layer 2b while being widely diffused in the plane direction by the water retention fiber. Thereby, since the liquid excrement diffused widely in the plane direction by the surface sheet 2 can be absorbed in a wide region in the plane direction of the absorber 4, the absorption performance can be enhanced.
Therefore, absorption performance can be improved, making the surface sheet 2 feel good.

  In this embodiment, as in the first embodiment, the average fiber length of the water retention fibers of the second fiber layer 2b may be shorter than the average fiber length of the water retention fibers of the first fiber layer 2a. It is not necessary to be short. In the case of being short, the same effect as in the case where the fiber density of the first fiber layer 2a is smaller than the fiber density of the second fiber layer 2b in the first embodiment can be obtained.

  On the other hand, when not short, the fiber length of the water retention fiber of the second fiber layer 2b is not particularly limited, and can take the same value as in the case of the first fiber layer 2a, for example, 10 to 80 mm. Can be mentioned.

  The absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined and changed within a range not departing from the object and spirit of the present invention.

1 Sanitary napkin (absorbent article)
2 Top sheet 2a 1st fiber layer 2b 2nd fiber layer

Claims (14)

An absorbent article comprising a top sheet, a back sheet, and an absorbent body positioned between the top sheet and the back sheet,
The surface sheet is
A first fiber layer containing water retention fibers;
A second fiber layer adjacent to the non-skin side of the first fiber layer and comprising hydrophobic fibers and water retention fibers;
With
The skin side surface of the first fiber layer constitutes the skin side surface of the top sheet,
The non-skin side surface of the second fiber layer constitutes the non-skin side surface of the top sheet,
The ratio of the water retention fiber in the fibers constituting the first fiber layer is greater than the ratio of the water retention fiber in the fibers constituting the second fiber layer,
Average distance between textiles of the second fiber layer is less than the average distance between the textiles of the first fibrous layer,
Absorbent article. An absorbent article comprising a top sheet, a back sheet, and an absorbent body positioned between the top sheet and the back sheet,
The surface sheet is
A first fiber layer containing water retention fibers;
A second fiber layer adjacent to the non-skin side of the first fiber layer and comprising hydrophobic fibers and water retention fibers;
With
The skin side surface of the first fiber layer constitutes the skin side surface of the top sheet,
The non-skin side surface of the second fiber layer constitutes the non-skin side surface of the top sheet,
The ratio of the water retention fiber in the fibers constituting the first fiber layer is greater than the ratio of the water retention fiber in the fibers constituting the second fiber layer,
The fiber density of the first fiber layer is smaller than the fiber density of the second fiber layer,
Absorbent article. An auxiliary sheet having a fiber density higher than the fiber density of the second fiber layer is further provided between the surface sheet and the absorber.
The absorbent article according to claim 2. The hydrophobic fibers included in the second fiber layer include heat-fusible fibers that are heat-sealed to each other.
The absorbent article as described in any one of Claims 1 thru | or 3. At least a part of the heat-fusible fiber of the second fiber layer is exposed on the skin side surface of the first fiber layer,
The absorbent article according to claim 4. In the thickness direction of the absorbent article, the surface sheet and the absorbent body have a compressed portion compressed,
At least a part of the heat-fusible fiber of the second fiber layer is exposed on the inner surface of the pressing part,
The absorbent article according to claim 4 or 5. The pressing part is
A low density portion having a shallow depth in the thickness direction of the absorbent article;
A high-density portion having a deep depth in the thickness direction of the absorbent article;
Including
At least a part of the heat-fusible fiber of the second fiber layer is exposed on the surface of the low density portion,
The absorbent article according to claim 6. The surface sheet is
A plurality of protrusions extending along the longitudinal direction of the absorbent article and positioned at intervals in the width direction of the absorbent article;
A plurality of recesses extending along the longitudinal direction of the absorbent article and positioned between adjacent protrusions;
Have
In the topsheet, the fiber density of the top of the convex part is S1, the fiber density of the bottom of the concave part is S2, and the fiber density of the region between the top of the convex part and the bottom of the concave part is S3, and When S1 <S3 <S2,
The absorbent article as described in any one of Claims 1 thru | or 7. The top sheet has a plurality of depressions compressed from the first fiber layer toward the second fiber layer in the thickness direction of the absorbent article in each of the plurality of recesses.
The absorbent article according to claim 8. The average fiber length of the hydrophobic fibers of the second fiber layer is longer than the average fiber length of the water retention fibers of the first fiber layer and the second fiber layer,
The absorbent article as described in any one of Claims 1 thru | or 9. The water retention fiber contained in the surface sheet is a cellulosic fiber,
The absorbent includes cellulosic fibers;
A part of the cellulosic fibers contained in the surface sheet is in contact with the cellulose fibers contained in the absorber,
The absorbent article as described in any one of Claims 1 thru | or 10. The fibers constituting the surface sheet are oriented in the longitudinal direction of the surface sheet at both ends in the width direction of the surface sheet, rather than in the center part in the width direction of the surface sheet.
The absorbent article as described in any one of Claims 1 thru | or 11. The water retention fiber contained in the surface sheet is cotton,
The absorbent article as described in any one of Claims 1 thru | or 12. An auxiliary sheet positioned between the top sheet and the absorber;
The widthwise dimension of the top sheet is smaller than the widthwise dimension of the auxiliary sheet,
The absorbent article as described in any one of Claims 1 thru | or 13.

Images