KR102475638B1 - absorbent article - Google Patents

Abstract

An absorbent article capable of suppressing leakage of bodily fluid by continuously wearing it in an appropriate position with respect to the body while reducing dampness and improving wearing comfort is provided. The absorbent article 1 includes a longitudinal direction (L) and a width direction (W) orthogonal to each other, a liquid-permeable topsheet 10, an air permeable and liquid-impermeable backsheet 20, and at least pulp 31. and a superabsorbent polymer 32, and an adhesive portion 50 disposed on the non-skin facing surface of the backsheet. The outer edge of the absorber is located inside the outer edge of the absorbent article. In the outer region RO between the outer edge of the absorber and the outer edge of the absorbent article, an overlapping portion P1 is provided in which the superabsorbent polymer and the adhesive portion overlap each other in the thickness direction.

Description

absorbent article

The present invention relates to absorbent articles such as panty liners and light incontinence pads that are attached to underwear and used.

BACKGROUND ART Conventionally, an absorbent article that is attached to underwear and absorbs bodily fluids such as clams, sweat, and urine has been used. The absorbent article of Patent Literature 1 includes a top sheet, a back sheet, an absorbent body disposed between the top sheet and the back sheet and having at least pulp and a superabsorbent polymer, and an adhesive portion disposed on the non-skin facing surface of the back sheet. have The backsheet of Patent Literature 1 is made of a non-breathable or breathable film (paragraph 0019 of Patent Literature 1).

Patent Document 1: Japanese Unexamined Patent Publication No. 2015-154881

Patent Literature 1 describes that dampness can be reduced by configuring the backsheet with a breathable film. However, an adhesive portion is provided on the non-skin facing surface of the backsheet, and moisture may reach the adhesive portion through the air permeable backsheet. When moisture reaches the adhesive portion, there is a possibility that the adhesive strength of the adhesive portion may be weakened. For this reason, there have been cases where the absorbent article is unintentionally displaced from the undergarment and cannot be continuously worn in an appropriate position with respect to the body, resulting in leakage of body fluid.

Therefore, there is a demand for an absorbent article capable of suppressing leakage of body fluid by continuously wearing the absorbent article at an appropriate position with respect to the body while reducing dampness and improving wearing comfort.

An absorbent article according to one aspect is provided with a longitudinal direction and a transverse direction orthogonal to each other, a liquid-permeable topsheet, an air permeable and liquid-impervious backsheet, and disposed between the topsheet and the backsheet, wherein at least pulp and solid material are present. An absorbent article having an absorbent body having an absorbent polymer and an adhesive portion disposed on a non-skin facing surface of the backsheet, wherein an outer edge of the absorbent body is located inside the outer edge of the absorbent article, and the outer edge of the absorbent body and the absorbent article An overlapping portion in which the superabsorbent polymer and the adhesive portion overlap each other in a thickness direction is provided in an outer region between outer edges of the outer portion.

1 is a plan view of an absorbent article according to an embodiment seen from the side facing the skin.
FIG. 2 is a plan view of the absorbent article shown in FIG. 1 seen from the side of the non-skin facing side.
Fig. 3 is a schematic cross-sectional view along AA section of the absorbent article shown in Fig. 1;
Fig. 4 is a schematic cross-sectional view along the BB section of the absorbent article shown in Fig. 1;

(1) Outline of Embodiment

From the description of this specification and accompanying drawings, at least the following matters become clear.

An absorbent article according to one aspect is provided with a longitudinal direction and a transverse direction orthogonal to each other, a liquid-permeable topsheet, an air permeable and liquid-impervious backsheet, and disposed between the topsheet and the backsheet, wherein at least pulp and solid material are present. An absorbent article having an absorbent body having an absorbent polymer and an adhesive portion disposed on a non-skin facing surface of the backsheet, wherein an outer edge of the absorbent body is located inside the outer edge of the absorbent article, and the outer edge of the absorbent body and the absorbent article An overlapping portion in which the superabsorbent polymer and the adhesive portion overlap each other in a thickness direction is provided in an outer region between outer edges of the outer portion.

According to this aspect, the superabsorbent polymer is disposed in the region where the absorber is disposed and in the outer region. Therefore, even when urine is discharged beyond the absorber, urine and the like can be retained by the superabsorbent polymer in the outer region. In addition, since the backsheet has air permeability, it is easy to discharge moisture out of the absorbent article through the backsheet when absorbing urine or sweat. Therefore, it is possible to reduce the moisture content and improve the wearing feeling. An overlapping portion in which the superabsorbent polymer and the adhesive portion overlap in the thickness direction is provided in the outer region. When bodily fluid reaches the overlapping portion, it is difficult for the bodily fluid to reach the backsheet because the superabsorbent polymer holds the bodily fluid. Therefore, it is difficult for moisture from the backsheet side to reach the adhesive portion in the overlapping portion, and the adhesive force can be maintained. It can be continuously worn at an appropriate position with respect to the body, and leakage of bodily fluid can be suppressed.

According to a preferred aspect, a non-displacement portion in which the superabsorbent polymer and the adhesive portion are not disposed may be provided in the outer region.

According to this aspect, since the superabsorbent polymer and the adhesive portion are not disposed in the non-displacement portion, it has high air permeability compared to the portion where the superabsorbent polymer is disposed and the portion where the adhesive portion is disposed. Air permeability can be ensured by the said non-disposition part. Moisture content can be further reduced, and the wearing feeling can be improved.

In the absorbent article according to another aspect, a polymer placement portion in which the superabsorbent polymer is disposed and the adhesive portion is not disposed may be provided in the outer region.

According to this aspect, since the polymer placement portion does not have an adhesive portion and is a portion that easily moves relative to the underwear, the superabsorbent polymer is easily deformed (swelled). The superabsorbent polymer disposed in the polymer placement portion is more likely to swell than the superabsorbent polymer disposed in the overlapping portion, so that body fluid absorption performance can be secured.

According to a preferred aspect, the outer region is provided with an adhesive portion in which the adhesive portion is disposed and the superabsorbent polymer is not disposed, and the adhesive portion and the polymer portion are provided in a planar view. may be adjacent.

According to this aspect, not only bodily fluid reaching the polymer placement part but also surrounding moisture can be absorbed by the superabsorbent polymer of the polymer placement part. Therefore, it is possible to reduce moisture in the adhesive placement portion adjacent to the polymer placement portion. In the adhesively placed portion, air can be transmitted without moisture passing through, so that the adhesive force of the adhesive portion can be maintained.

According to a preferred aspect, the outer region has a first region on the side of the absorbent article and a second region on the outer edge side of the absorbent article, and the density of the superabsorbent polymer in the first region is equal to or greater than the second region. It may be higher than the density of the superabsorbent polymer of the region.

According to this aspect, the first region has a high density of the superabsorbent polymer and can retain body fluid that the absorber cannot retain. The second region is in contact with a region prone to sweat away from the excretory unit. The second area can reliably absorb sweat, which is less water than excretion. In addition, since the density of the superabsorbent polymer in the second region is low, it is possible to reduce discomfort to the skin due to unevenness when the superabsorbent polymer expands.

According to a preferred aspect, the absorber has a central region including the center of the absorber in the thickness direction and a surface-side region located outside the central region in the thickness direction, and the high The density of the water absorbent polymer may be higher than that of the superabsorbent polymer in the surface side region.

According to a preferred aspect, the hydrophilicity on the side of the skin-facing surface of the absorber may be higher than the hydrophilicity on the side of the non-skin-facing surface of the absorber.

According to this aspect, since the absorber has high hydrophilicity on the skin-facing surface, body fluids excreted on the topsheet can be quickly drawn in, and the body fluids can be retained by the superabsorbent polymer in the absorber. Further, since the absorber has a low hydrophilicity on the non-skin facing side, it is difficult for body fluids in the absorber to reach the backsheet. Accordingly, it is difficult for moisture in the body fluid to reach the adhesive portion, suppressing a decrease in adhesive force due to the arrival of moisture, and suppressing twisting of the absorbent article.

According to this aspect, the density of the superabsorbent polymer in the central region is high, so that the central region easily swells when body fluid is absorbed. Therefore, the capacity for absorbing body fluids can be secured. In addition, since the density of the superabsorbent polymer in the surface-side region is low, the surface-side region is less likely to swell when bodily fluid is absorbed. Since unevenness due to swelling of the superabsorbent polymer is difficult to form in the surface-side region, it is difficult for the unevenness of the absorbent body to be transmitted to the topsheet or backsheet located outside the absorber in the thickness direction. It is possible to reduce discomfort at the time of wearing due to transmission of the unevenness to the top sheet or the back sheet.

According to a preferred aspect, a crimping portion for compressing at least the topsheet and the backsheet in the thickness direction is provided in the outer region, and the crimping portion may be disposed along the periphery of the absorbent article.

According to this aspect, even if bodily fluid reaches the crimping part, the bodily fluid diffuses in the crimping part having a high density, and it becomes difficult for the bodily fluid to reach the outside of the crimping part.

According to a preferred aspect, in the compression portion, the topsheet, the backsheet, and the adhesive portion may be compressed in the thickness direction.

According to this aspect, since the backsheet, the topsheet, and the adhesive portion are compressed together, both the backsheet and the adhesive portion enter the concave portion by the crimping portion, so even if moisture reaches the adhesive portion and the adhesiveness is lowered, the adhesive portion and the backsheet is difficult to peel off.

According to a preferred aspect, the tensile strength of the backsheet may be lower than the tensile strength of the topsheet.

According to this aspect, when forming the crimping portion, the backsheet is unlikely to stretch and the backsheet is unlikely to become thin. Therefore, it is difficult for moisture to permeate through the crimping portion, and the decrease in strength of the adhesive portion due to the arrival of moisture can be suppressed. Further, since the tensile strength of the backsheet is low, the height of the unevenness by the crimping part on the backsheet side is lower than the height of the unevenness by the crimping part on the topsheet side. Therefore, the gap between the undergarment and the backsheet can be made small, and the absorbent article can be stably fixed to the undergarment.

According to a preferred aspect, the ratio of the tensile strength of the backsheet in the width direction to the tensile strength of the backsheet in the longitudinal direction may be 0.7 or more and 1.3 or less.

According to this aspect, the difference between the elongation strength in the longitudinal direction and the elongation strength in the width direction of the backsheet is small, and the backsheet is less likely to sink in the thickness direction when forming the crimping portion. Therefore, the gap between the undergarment and the backsheet can be made small, and the absorbent article can be stably fixed to the undergarment.

According to a preferred aspect, both the tensile strength of the backsheet in the longitudinal direction and the tensile strength of the backsheet in the width direction may be 2.0 N/25 mm or more.

According to this aspect, the tensile strength of the backsheet in the longitudinal direction and the tensile strength of the backsheet in the width direction are greater than the force applied to the backsheet when peeling the absorbent article from the underwear, so that the backsheet is suppressed from being unintentionally torn. can do.

According to a preferred aspect, the absorbent article has a third region located at the center in the longitudinal direction and a fourth region located outside the third region in the longitudinal direction, wherein the fourth region is located in the width direction The maximum width of is longer than the maximum width of the third region in the width direction, the crimping portion of the fourth region has a wide portion longer in the width direction than the crimping portion in the third region, and the wide width The portion may be provided at a position of the maximum width of the fourth region.

The outer edge of the absorbent article at the maximum width of the fourth region is easily subjected to an external force such as leg force. Since the wide part is provided at the position of the maximum width, the rigidity of the position of the maximum width can be increased by the wide part of the crimping part, and the problem that the absorbent article is twisted or twisted from the underwear due to external force can be suppressed.

According to a preferred aspect, the adhesive portion extends along the width direction and is provided in plurality at intervals in the longitudinal direction, and the adhesive portion located at the outermost side in the longitudinal direction is the wide width portion in the width direction. may overlap with

The adhesive portion located at the outermost side in the longitudinal direction is likely to receive force along the longitudinal direction from the body or underwear. Since the adhesive portion overlaps the wide width portion in the width direction, the rigidity of the outermost adhesive portion can be increased by the wide width portion of the crimping portion, thereby suppressing the problem of the absorbent article being twisted or distorted from the underwear due to external force. can do.

According to a preferred aspect, the adhesive portion located at the outermost side in the longitudinal direction may reach the periphery of the absorbent article and may overlap the wide portion in the thickness direction.

According to this aspect, the rigidity of the outermost adhesive portion can be further increased by the wide width portion of the crimping portion, and problems such as twisting of the absorbent article or twisting from the underwear due to external force can be suppressed.

According to a preferred aspect, in the outer region, the skin facing surface of the backsheet may be provided with an adhesive portion coated with an adhesive for adhering the topsheet and the backsheet.

According to this aspect, the superabsorbent polymer is adhered to the backsheet by the adhesive portion on the backsheet side. The body fluid can be held immediately before the body fluid reaches the adhesive portion provided on the back sheet, and the adhesive force of the adhesive portion is more easily maintained. In addition, since the superabsorbent polymer and the topsheet are not bonded, a space where the superabsorbent polymer swells is easily formed on the topsheet side, and the superabsorbent polymer easily swells.

According to another aspect, in the outer region, an adhesive portion coated with an adhesive for adhering the topsheet and the backsheet may be provided on the non-skin facing surface of the topsheet.

According to this aspect, the superabsorbent polymer is adhered to the topsheet by the adhesive portion on the topsheet side. Therefore, the body fluid permeating through the topsheet can be immediately absorbed from the topsheet side. In addition, since the superabsorbent polymer and the backsheet are not bonded, a space where the superabsorbent polymer swells is easily formed on the backsheet side, and the superabsorbent polymer easily swells.

(2) Overall outline of the absorbent article

Hereinafter, the absorbent article according to the embodiment will be described with reference to the drawings. In addition, in description of the following drawings, the same or similar code|symbol is attached|subjected to the same or similar part. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from reality. Therefore, specific dimensions and the like must be determined in consideration of the following description. In addition, even between the drawings, parts having different dimensional relationships or ratios may be included.

The absorbent article is a pantyliner. Further, the absorbent article according to the present invention may be an absorbent article used by being attached to underwear, and may be, for example, a light incontinence pad. Fig. 1 is a plan view of the absorbent article 1 according to the present embodiment, seen from the side facing the skin. Fig. 2 is a plan view of the absorbent article shown in Fig. 1 viewed from the side of the non-skin facing surface. Fig. 3 is a schematic cross-sectional view along the A-A section of the absorbent article shown in Fig. 1; Fig. 4 is a schematic sectional view taken along a BB cross section of the absorbent article shown in Fig. 1;

The absorbent article 1 has a longitudinal direction L and a width direction W that are orthogonal to each other. The longitudinal direction L is defined by directions extending to the front side of the body and the rear side of the body. In other words, the longitudinal direction L is a direction extending forward and backward in the unfolded absorbent article 1 . In addition, the absorbent article 1 has a thickness direction T in which both the longitudinal direction L and the width direction W cross at right angles. The thickness direction T extends to a skin-facing surface side T1 toward the wearer side and a non-skin-facing surface side T2 opposite to the skin-facing surface side.

The absorbent article 1 has at least a top sheet 10, a back sheet 20, and an absorber 30. The topsheet 10 may be formed of, for example, a liquid-permeable sheet such as nonwoven fabric or perforated plastic film. The topsheet 10 may be configured by stacking a plurality of sheets, or may have a second sheet. For example, the topsheet 10 may be constituted by a skin-side sheet formed by laminating a cotton sheet containing cotton fibers and a sheet made of rayon and polyethylene, and the skin-side sheet and a second sheet made of an air-through nonwoven fabric The topsheet 10 may be constituted by The topsheet 10 of this embodiment is made of an air-through nonwoven fabric. More preferably, the absorber-side surface of the topsheet 10 may be made of an air-through nonwoven fabric. Air-through nonwoven fabrics have relatively large voids between fibers, making it easy to uniformly dispose the superabsorbent polymer of the absorber described later. Accordingly, the superabsorbent polymer easily swells over the entire absorbent article, and the absorbent performance can be improved.

The backsheet 20 may be formed of, for example, a breathable and liquid-impermeable sheet such as a plastic film. Since the backsheet 20 has air permeability, it is easy to discharge moisture out of the absorbent article through the backsheet 20 when absorbing urine or sweat. Therefore, it is possible to reduce the moisture content and improve the wearing feeling. The top sheet 10 and the back sheet 20 reach the outer edge of the absorbent article. In this embodiment, the outer edge is the outer edge in the width direction W, the front edge is the front edge, and the rear edge is the rear edge. In addition, the outer edge is the edge of the entire outer periphery including the outer edge, the front edge, and the rear edge.

On the non-skin facing surface of the backsheet 20, an adhesive portion 50 for attaching the absorbent article 1 to underwear is disposed. The adhesive portion 50 extends in the width direction W and is provided in plurality at intervals in the longitudinal direction L. The adhesive portion 50 may reach the outer edge 1E of the absorbent article 1 . The adhesive portion 50 has an adhesive portion 51 located at the outermost side in the longitudinal direction L. The adhesive portion 51 located at the outermost side in the longitudinal direction L may be located outside the maximum width PM of the absorbent article 1 in the longitudinal direction L. The maximum width (PM) of this absorbent article is the maximum width of a fourth region described later. Further, in a modified example, the adhesive portion 50 may extend in the longitudinal direction L and may be disposed at intervals in the width direction W.

The absorber 30 is disposed between the top sheet 10 and the back sheet 20 . The absorber 30 has an absorbent material such as at least pulp 31 and superabsorbent polymer (SAP) 32. The absorber has a pulp, and the pulp can absorb the shrimp. In addition, the absorbent body has a superabsorbent polymer 32, and urine and sweat can be absorbed by the superabsorbent polymer 32. The absorber 30 may be a sheet-shaped absorber. The absorber 30 may have a core wrap surrounding the absorbent material. As shown in FIG. 3 , the absorber 30 includes a central region RC including the center of the absorber in the thickness direction, and a surface-side region located outside the central region RC in the thickness direction T ( RS). The surface side region RS is provided on the skin facing surface side T1 and the skin non-facing surface side T2 of the center region RC, respectively. The boundary between the surface side region RS and the center region RC is a boundary that divides the absorber 30 into thirds in the thickness direction.

The outer edge 30E of the absorbent body 30 is located inside the outer edge 1E of the absorbent article 1 . That is, the front edge 30F of the absorbent article 30 is located on the rear side of the front edge 1F of the absorbent article 1, and the rear edge 30R of the absorbent article 30 is the rear edge 1R of the absorbent article 1. ), and the outer edge 30S of the absorbent body 30 is located inside the outer edge 1S of the absorbent article 1 in the width direction W. An outer region RO is provided between the outer edge 30E of the absorber 30 and the outer edge 1E of the absorbent article 1 . The outer region RO is a region hatched in FIG. 1 . The top sheet 10 and the back sheet 20 are disposed in the outer region RO. In the outer region RO, the pulp 31 is not disposed, and the superabsorbent polymer 32 is disposed. The superabsorbent polymer 32 is disposed in the region where the absorber is disposed and in the outer region. Therefore, even when urine is discharged beyond the absorber, urine and the like can be retained by the superabsorbent polymer 32 . In addition, the superabsorbent polymer 32 can adsorb the ammonia component dissolved in water and gaseous ammonia, and the odor can also be reduced.

The absorbent article of this embodiment is used as a panty liner over a long period of time. In addition to absorbing body fluids such as clams and sweat by the pulp, body fluids caused by light incontinence can also be absorbed by the superabsorbent polymer 32 . Even if the absorbent article of this embodiment absorbs not only clams but also urine, it is possible to push moisture out of the air permeable backsheet 20 and maintain a dry wearing feeling.

4 is a diagram schematically showing a cross section of the absorbent article in the outer region RO. In the outer region RO, an overlapping portion P1 is provided in which the superabsorbent polymer 32 and the adhesive portion 50 overlap each other in the thickness direction T. In the overlapping portion P1, the topsheet 10, the superabsorbent polymer 32, the backsheet 20, and the adhesive portion 50 are disposed from the skin facing side T1 to the skin non-facing side T2. has been When bodily fluid reaches the overlapping portion P1, the superabsorbent polymer 32 retains the bodily fluid, making it difficult for the bodily fluid to reach the backsheet 20. Therefore, it is difficult for moisture from the backsheet 20 side to reach the adhesive portion 50 in the overlapping portion P1, and the adhesive force can be maintained. The adhesive force of the adhesive portion 50 can be maintained in the overlapping portion P1, and unintentional twisting of the absorbent article 1 relative to the underwear can be suppressed. It can be continuously worn at an appropriate position with respect to the body, and leakage of bodily fluid can be suppressed. Accordingly, leakage of bodily fluid can be suppressed by continuing to wear the device at an appropriate position with respect to the body while reducing the feeling of moisture and improving the wearing feeling.

In the outer region RO, a non-displacement portion P2 in which the superabsorbent polymer 32 and the adhesive portion 50 are not disposed may be provided. In the non-arrangement portion P2, the top sheet 10 and the back sheet 20 are disposed from the skin facing surface side T1 toward the skin non-facing surface side T2. Since the superabsorbent polymer 32 and the adhesive portion 50 are not disposed in the non-displacement portion P2, the superabsorbent polymer 32 and the adhesive portion 50 are disposed at a high level compared to the portion where the superabsorbent polymer 32 and the adhesive portion 50 are disposed. have permeability. Air permeability can be ensured by the non-disposition part P2. It is possible to further reduce the moisture content and improve the wearing feeling.

In the outer region RO, a polymer placement portion P3 in which the superabsorbent polymer 32 is disposed and the adhesive portion 50 is not disposed may be provided. In the polymer placement portion P3, the top sheet 10 and the back sheet 20 are disposed from the skin facing surface side T1 toward the skin non-facing surface side T2. Since the adhesive portion 50 is not disposed in the polymer placement portion P3, it is not bonded to the underwear and is relatively easily movable, and the superabsorbent polymer 32 is easily deformed (swelled). The superabsorbent polymer 32 disposed in the polymer placement portion swells more easily than the superabsorbent polymer 32 disposed in the overlapping portion, and thus the body fluid absorption performance can be secured.

In the outer region RO, an adhesive arranging portion P4 in which the adhesive portion 50 is disposed and the superabsorbent polymer 32 is not disposed may be provided. In the adhesive mounting portion P4, the top sheet 10, the back sheet 20, and the adhesive portion 50 are disposed from the skin facing surface side T1 toward the skin non-facing surface side T2. The polymer disposition portion P3 may be adjacent to at least one of the adhesive disposition portion P4 and the non-disposition portion P2 in a planar view. The superabsorbent polymer 32 of the polymer placement part P3 can absorb not only bodily fluids reaching the polymer placement part P3 but also surrounding moisture. Therefore, it is possible to reduce moisture in the adhesive placement portion P4 or the non-dispatching portion P2 adjacent to the polymer placement portion P3. According to this structure, air can be permeated without passing moisture in the adhesive mounting portion P4, and the adhesive force of the adhesive portion 50 can be maintained.

A crimping portion 60 in which the top sheet 10 and the back sheet 20 are compressed in the thickness direction T may be provided in the outer region RO. The crimping portion 60 may be provided along the outer edge 1E of the absorbent article 1 . A plurality of crimping portions 60 are provided inside the outer edge 1E of the absorbent article 1, and may be disposed along the outer edge 1E at intervals. By providing the compression portion 60, even if bodily fluid reaches the compression portion 60 of the outer region RO, the body fluid spreads in the compression portion 60 having a high density, so that It becomes difficult for body fluids to reach the outside. In addition, the superabsorbent polymer 32 is not disposed in the non-displaced portion and the adhesively disposed portion of the outer region RO, and the back sheet or the like is not easily torn when the crimping portion 60 is formed. Therefore, it is possible to ensure adhesiveness to undergarments and to suppress leakage of bodily fluid due to tearing of the sheet.

In the crimping portion 60, the top sheet 10, the back sheet 20, and the adhesive portion 50 may be compressed in the thickness direction. Since the backsheet 20, the topsheet 10, and the adhesive portion 50 are compressed together, the backsheet 20 and the adhesive portion 50 enter the concave portion formed therein, so that, for example, moisture is not absorbed into the adhesive portion 50. , the adhesive portion 50 and the backsheet 20 are difficult to separate even when the adhesiveness decreases.

The tensile strength of the backsheet 20 may be higher than that of the topsheet 10 . More preferably, the tensile strength of the backsheet 20 may be higher than that of other materials constituting the absorbent article (topsheet, absorbent body, etc.). Here, the tensile strength is a value indicating the difficulty of stretching the sheet in the planar direction, and can be specifically measured by the following measuring method. It is performed using (1) a tensile tester and (2) a punching frame (rectangular frame length 44 mmХ width 25 mm). In order, first, a test piece is prepared. A test piece is prepared by immersing an absorbent article in toluene, dividing it into a top sheet and a back sheet, and punching the sheet to be measured with a punching frame with a dimension of 45 mmХ25 mm. Each handle part is provided at a length of 7 mm from both ends in the longitudinal direction (45 mm) of the test piece so that a chuck interval of 30 mm is taken in the center of the test piece. The handle portion is created by holding a test piece between both sides with an aluminum tape having a length of 50 mm and a width of 30 mm. Subsequently, measurements were made at a chuck interval of 30 mm and a tensile speed of 500 mm/min. Strength (N/25 mm) and maximum elongation strength (N/25 mm) at 5% elongation in each of the longitudinal and transverse directions are measured.

The relationship between the tensile strength of the top sheet and the back sheet in the present invention is defined as follows. The 5% elongation strength in the longitudinal direction of the topsheet is higher than the 5% elongation strength in the longitudinal direction of the backsheet, and the 5% elongation strength in the width direction of the topsheet is 5% elongation in the width direction of the backsheet. If it is higher than the strength, it is assumed that the tensile strength of the top sheet 10 is higher than that of the back sheet. On the other hand, the 5% elongation strength of the topsheet in the longitudinal direction is higher than the 5% elongation strength of the backsheet in the longitudinal direction, and the 5% elongation strength in the width direction of the topsheet is 5% in the width direction of the backsheet. When the elongation strength of 5% in the longitudinal direction of the topsheet is lower than the 5% elongation strength in the longitudinal direction of the backsheet, and the elongation strength of 5% in the width direction of the topsheet is lower than that of the backsheet When the elongation strength of 5% in the longitudinal direction of the topsheet is lower than the elongation strength of 5% in the longitudinal direction of the topsheet, and the elongation strength of 5% in the longitudinal direction of the backsheet is lower than the elongation strength of 5% in the longitudinal direction of the topsheet. When the elongation strength is higher than the elongation strength of 5% in the width direction of the backsheet, the elongation strength of the backsheet 20 is higher than the elongation strength of the topsheet 10 in all cases.

Since the tensile strength of the backsheet 20 is higher than the tensile strength of the topsheet 10, the backsheet 20 is less likely to be stretched when forming the crimping portion 60, and the backsheet 20 is less likely to become thin. Therefore, it is difficult for moisture to permeate through the crimping portion 60, and the decrease in strength of the adhesive portion 50 due to the arrival of moisture can be suppressed. In addition, since the backsheet 20 has high tensile strength and is difficult to stretch, the height of the unevenness by the crimping portion on the backsheet 20 side is higher than the height of the unevenness by the crimping portion on the topsheet 10 side. It gets lower. Therefore, the gap between the undergarment and the backsheet can be made small, and the absorbent article can be stably fixed to the undergarment. Further, the top sheet of the present embodiment is configured to be stretched in only one of the longitudinal direction or the width direction, and the back sheet is configured to be stretched in both the longitudinal direction and the width direction. Stretching strength tends to be low because it can be stretched in both directions.

The ratio of the tensile strength in the width direction of the backsheet to the tensile strength in the longitudinal direction of the backsheet may be 0.7 or more and 1.3 or less. More suitably, the said ratio may be 0.9 or more and 1.1 or less. When the ratio of the tensile strength of the backsheet in the width direction to the tensile strength in the longitudinal direction of the backsheet is 0.7 or more and 1.3 or less, the difference between the tensile strength in the longitudinal direction and the tensile strength in the width direction of the backsheet is small, and the crimping portion During formation, the back sheet becomes difficult to sink in the thickness direction. Therefore, the gap between the undergarment and the backsheet can be made small, and the absorbent article can be stably fixed to the undergarment.

The tensile strength of the backsheet in the longitudinal direction and the tensile strength of the backsheet in the width direction may both be 2.0 N/25 mm or more, more preferably 5.0 N/25 mm or more. When the backsheet has a tensile strength of 2.0 N/25 mm or more, it is stronger than the force applied to the backsheet when peeling the absorbent article from the undergarment, and unintentional tearing of the backsheet can be suppressed.

As shown in FIG. 3 , the outer region RO has a first region R1 on the absorber 30 side and a second region R2 on the outer edge 1E side of the absorbent article 1 . The boundary between the first region R1 and the second region R2 is the center of the outer edge 1E of the absorbent article 1 and the outer edge 30E of the absorbent body 30 . The density of the super absorbent polymer 32 in the first region R1 may be higher than that of the super absorbent polymer 32 in the second region R2. The first region R1 has a high density of the superabsorbent polymer 32 and can retain body fluid that the absorber 30 cannot retain. The second region R2 contacts an area prone to sweat away from the excretory area. The second region R2 can reliably absorb sweat, which produces less water than excretion. In addition, since the density of the superabsorbent polymer in the second region R2 is low, it is possible to reduce discomfort to the skin due to unevenness when the superabsorbent polymer 32 expands. In addition, as the method for measuring the density, the density can be measured by cutting out a test piece having the same area in each of the first area and the second area, taking out the superabsorbent polymer contained in the test piece, and measuring the weight. .

The density of the superabsorbent polymer 32 in the outer region RO located outside the absorber 30 in the width direction W is the outer region located outside the absorber 30 in the longitudinal direction L. RO) may be higher than the density of the superabsorbent polymer 32 in the second region. The outside region RO located outside the absorber 30 in the width direction W is easy to come into contact with the wearer's leg. Moisture due to sweat or the like can be absorbed in the area that touches the base of the leg, which is relatively prone to sweating. Further, as the method for measuring the density, as in the method for measuring the first region and the second region, a test piece having the same area is cut out in each region, and the superabsorbent polymer contained in the test piece is taken out and the weight is measured. , the density can be measured.

The density of the superabsorbent polymer 32 in the absorber may be constant or different. As shown in FIG. 3, the density of the super absorbent polymer 32 in the central region RC of the absorber 30 is the density of the super absorbent polymer 32 in the surface side region RS of the absorber 30. It may be higher. Since the density of the superabsorbent polymer 32 in the central region is high, the central region RC is easily swollen when bodily fluid is absorbed. Therefore, the capacity for absorbing body fluids can be secured. In addition, since the density of the superabsorbent polymer 32 in the surface-side region RS is low, it is difficult for the surface-side region RS to swell when bodily fluid is absorbed. Since unevenness due to swelling of the superabsorbent polymer 32 is difficult to form in the surface-side region RS, the topsheet 10 or the backsheet 20 positioned outside the absorber in the thickness direction are provided with irregularities of the absorber. This becomes difficult to convey. It is possible to reduce discomfort at the time of wearing due to the transfer of irregularities to the topsheet 10 or the backsheet 20 . In addition, as the method for measuring the density, the absorbent article is cut into a cross section along the thickness direction, the cross section is photographed with an electrophotograph, and the number of super absorbent polymers included in the same area is measured in each region. It can be measured as a thing which a density becomes high, so that there are many.

The hydrophilicity of the skin-facing surface side T1 of the absorber 30 may be higher than the hydrophilicity of the non-skin-facing surface side T2 of the absorber 30 . Here, hydrophilicity means the strength with which an absorber attracts water, and the power of absorbing liquid becomes stronger on the side with high hydrophilicity compared to the side with low hydrophilicity. Since the skin-facing surface side T1 of the absorber 30 has high hydrophilicity, the body fluid excreted on the topsheet 10 can be quickly drawn in and the body fluid can be retained by the superabsorbent polymer 32 in the absorber 30. have. In addition, since the hydrophilicity of the non-skin facing side T2 of the absorber 30 is low, it is difficult for the body fluid in the absorber 30 to reach the backsheet 20. Therefore, it is difficult for moisture in the body fluid to reach the adhesive portion 50, and the decrease in adhesive force due to the arrival of moisture can be suppressed, and twisting of the absorbent article can be suppressed.

As a method of varying the hydrophilicity of the absorber in the thickness direction, for example, the absorber is composed of two layers, an upper layer on the skin-facing surface side and a lower layer on the skin-non-facing surface side, and the hydrophilicity of a binder for hardening the absorbent material is set to the upper layer. and can be made different by the lower layer. A binder containing a hydrophilic agent is used as an upper binder, and a binder containing no hydrophilic agent is used as a lower binder.

In addition, hydrophilicity can be measured by the following method. (1) Five filter papers are overlapped and placed horizontally, and the test piece to be measured is placed on top of the filter paper. (2) Mark the test piece at 2 cm intervals in each of the vertical and horizontal directions. 1 drop (about 0.05 g) of artificial urine is dripped at 20 locations with a pipette. Artificial urine is dripped at 20 locations for 1 minute and 10 seconds. (3) After leaving 20 places to stand for 30 seconds from the end of dropping, count the places absorbed by the test piece. The more absorption sites of the test piece, the higher the hydrophilicity.

In the outer region RO, on the surface facing the skin of the backsheet 20, an adhesive portion 70 may be provided to which an adhesive for adhering the topsheet 10 and the backsheet 20 is applied. As the adhesive, for example, a hot melt type adhesive can be exemplified. The superabsorbent polymer 32 is adhered to the backsheet 20 by the adhesive portion on the backsheet side. Since bodily fluid can be retained just before the bodily fluid reaches the adhesive portion 50 provided on the backsheet 20, the adhesive force of the adhesive portion 50 can be more easily maintained. In addition, since the superabsorbent polymer 32 and the topsheet 10 are not bonded, a space where the superabsorbent polymer 32 swells is easily formed on the topsheet 10 side, and the superabsorbent polymer 32 It becomes easy to swell.

As shown in FIG. 1, the absorbent article 1 has a third region R3 located at the center in the longitudinal direction L and a fourth region located outside the third region in the longitudinal direction L. (R4). The boundary between the third region R3 and the fourth region R4 is a boundary that divides the absorbent article into thirds in the longitudinal direction L. The maximum width of the fourth region in the width direction W is greater than the maximum width of the third region in the width direction W.

The crimping portion 60 may be provided across the third region R3 and the fourth region R4. The crimping portion 60 in the fourth region R4 has a wider width portion 61 longer in the width direction W than the crimping portion 60 in the third region R3. The wide portion 61 is an area shaded in FIG. 2 . The compression portion 60 of the third region R3 and the compression portion 60 located inside the longitudinal direction L of the wide width portion 61 in the fourth region R4 are linear in which a plurality of circular arcs are connected. It is constituted by a crimping part 65 and a point-shaped crimping part 66 disposed inside the linear crimping part 65 and along the linear crimping part 60 . That is, two rows of crimping parts are disposed. In contrast, in the wide portion 61, point-shaped crimping parts 66 disposed along the linear crimping part 65 are provided on the outer and inner sides of the linear crimping part 65 in which a plurality of circular arcs are connected, respectively. have. That is, three rows of crimping parts are disposed. The wide portion 61 may be provided at a position of the maximum width PM of the fourth region. The outer edge of the absorbent article at the maximum width of the fourth region is easily subjected to an external force such as leg force. Since the wide part 61 is provided at the position of the maximum width, the rigidity of the position of the maximum width can be increased by the wide part 61 of the crimping part 60, so that the absorbent article is not twisted or twisted from the underwear by external force. You can suppress the problem of losing.

Further, the wide width portion 61 may overlap in the width direction W with the adhesive portion 51 located at the outermost side in the longitudinal direction L. The overlapping state in the width direction W is a state in which the adhesive portion 51 is disposed on an extension line extending in the width direction W of the wide width portion 61 . The adhesive portion 51 located at the outermost side in the longitudinal direction is likely to receive force along the longitudinal direction L from the body or undergarments. Since the adhesive portion 51 overlaps the wide width portion 61 in the width direction W, the stiffness of the outermost adhesive portion 51 is reduced by the wide width portion 61 of the compression portion 60. It can be raised, and problems such as twisting of the absorbent article or twisting from the undergarment due to external force can be suppressed.

More preferably, the adhesive portion 51 located at the outermost side in the longitudinal direction L may reach the outer edge 1E of the absorbent article and overlap the wide width portion 61 in the thickness direction T. . The rigidity of the outermost adhesive portion 50 can be further increased by the wide width portion 61 of the crimping portion 60, and the problem of the absorbent article being twisted or distorted from the underwear due to external force can be suppressed. have.

As mentioned above, although this invention was demonstrated in detail using the above-mentioned embodiment, it is clear to those skilled in the art that this invention is not limited to the embodiment demonstrated in this specification. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description in this specification is for the purpose of illustrative explanation, and does not have any limiting meaning with respect to the present invention.

For example, in the absorbent article according to the modified example, an adhesive for adhering the topsheet 10 and the backsheet 20 is applied to the non-skin facing surface of the topsheet 10 in the outer region RO, and an adhesive portion is applied. may be provided The superabsorbent polymer 32 is adhered to the topsheet 10 by the adhesive portion on the topsheet 10 side. Accordingly, bodily fluids permeating through the topsheet 10 can be immediately absorbed from the topsheet 10 side. In addition, since the superabsorbent polymer 32 and the backsheet 20 are not bonded, a space in which the superabsorbent polymer 32 swells is easily formed on the backsheet 20 side, so that the superabsorbent polymer 32 It becomes easy to swell. In addition, when the skin-facing non-woven fabric of the topsheet 10 is made of an air-through nonwoven fabric, the superabsorbent polymer 32 easily enters the nonwoven fabric, which is relatively bulky and has large voids between fibers. Accordingly, a space for swelling of the superabsorbent polymer 32 is more easily formed on the backsheet 20 side, and the water absorption performance can be improved.

All contents of Japanese Patent Application No. 2018-052339 filed on March 20, 2018 are incorporated herein by reference.

ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide an absorbent article capable of suppressing leakage of bodily fluid by continuously wearing it in an appropriate position with respect to the body while reducing dampness and improving wearing comfort.

1: absorbent article
10: surface sheet
20: back sheet
30: absorber
31: Pulp
32: super absorbent polymer
50: adhesive part
51: adhesive part located on the outermost side in the longitudinal direction
60: compression part
61: wide part
70: adhesive part
RO: outer region
R1: first area
R2: Second area
R3: Third area
R4: 4th area
RC: central region
RS: surface side area
P1: overlapping part
P2: non-placement unit
P3: polymer placement unit
P4: adhesive placement unit
PM: maximum width

Claims (17)

A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A breathable and liquid impermeable back sheet;
an absorbent body disposed between the top sheet and the back sheet and having at least pulp and a superabsorbent polymer;
An absorbent article having an adhesive portion disposed on the non-skin facing surface of the back sheet,
The outer edge of the absorber is located inside the outer edge of the absorbent article,
In the outer region between the outer edge of the absorbent body and the outer edge of the absorbent article,
an overlapping portion in which the superabsorbent polymer and the adhesive portion overlap each other in a thickness direction;
a polymer placement portion in which the superabsorbent polymer is disposed and the adhesive portion is not disposed;
an adhesive placement portion in which the adhesive portion is disposed and the superabsorbent polymer is not disposed;
The absorbent article according to claim 1 , wherein the adhesive placement portion and the polymer placement portion are adjacent to each other in a planar view. A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A breathable and liquid impermeable back sheet;
an absorbent body disposed between the top sheet and the back sheet and having at least pulp and a superabsorbent polymer;
An absorbent article having an adhesive portion disposed on the non-skin facing surface of the back sheet,
The outer edge of the absorber is located inside the outer edge of the absorbent article,
In the outer region between the outer edge of the absorbent body and the outer edge of the absorbent article,
an overlapping portion in which the superabsorbent polymer and the adhesive portion overlap each other in a thickness direction;
a crimping portion for compressing at least the top sheet and the back sheet in the thickness direction;
The compression unit is disposed along an outer periphery of the absorbent article,
The absorbent article according to claim 1 , wherein, in the compression portion, the top sheet, the back sheet, and the adhesive portion are compressed in the thickness direction. The absorbent article according to claim 2, wherein the backsheet has a higher tensile strength than the topsheet. The absorbent article according to claim 3, wherein a ratio of the tensile strength of the backsheet in the width direction to the tensile strength of the backsheet in the longitudinal direction is 0.7 or more and 1.3 or less. The absorbent article according to claim 3 or 4, wherein both the tensile strength of the backsheet in the longitudinal direction and the tensile strength of the backsheet in the width direction are 2.0 N/25 mm or more. The absorbent article according to any one of claims 2 to 4, wherein the absorbent article has a third region located at the center in the longitudinal direction and a fourth region located outside the third region in the longitudinal direction. ,
The maximum width of the fourth region in the width direction is longer than the maximum width of the third region in the width direction;
The compression portion of the fourth region has a wide width portion that is longer in the width direction than the compression portion of the third region,
The absorbent article according to claim 1 , wherein the wide portion is provided at a position of the maximum width in the fourth region. The method according to claim 6, wherein the adhesive portion extends along the width direction and is provided in plurality at intervals in the longitudinal direction,
The absorbent article according to claim 1 , wherein the adhesive portion located at the outermost side in the longitudinal direction overlaps the wide portion in the width direction. The absorbent article according to claim 7, wherein the adhesive portion located at the outermost side in the longitudinal direction reaches an outer edge of the absorbent article and overlaps with the wide portion in the thickness direction. The absorbent article according to any one of claims 1 to 4, wherein in the outer region, the skin facing surface of the backsheet is provided with an adhesive portion coated with an adhesive for adhering the topsheet and the backsheet. The absorbent article according to any one of claims 1 to 4, wherein an adhesive portion coated with an adhesive for adhering the topsheet and the backsheet is provided on the non-skin facing surface of the topsheet in the outer region. The absorbent article according to any one of claims 1 to 4, wherein the outer region is provided with a non-displacement portion in which the superabsorbent polymer and the adhesive portion are not disposed. The outer region according to any one of claims 1 to 4, wherein the outer region has a first region on the side of the absorbent body and a second region on the outer edge side of the absorbent article;
An absorbent article in which the density of the super absorbent polymer in the first region is higher than that of the super absorbent polymer in the second region. The absorber according to any one of claims 1 to 4, wherein the absorber has a central region including a center of the absorber in the thickness direction and a surface region located outside the central region in the thickness direction. ,
The absorbent article of claim 1 , wherein a density of the super absorbent polymer in the central region is higher than that of the super absorbent polymer in the surface side region. The absorbent article according to any one of claims 1 to 4, wherein the absorbent body has a higher hydrophilicity than the skin-facing surface side of the absorber. delete delete delete

Images