JP2019170546A - Absorbent article - Google Patents

Abstract

An absorbent article provided with a deodorizing sheet capable of taking in and adsorbing odor components by itself. An absorbent article includes an absorbent body including a superabsorbent polymer, and a deodorizing sheet disposed on a non-skin facing side of the absorbent body. The deodorizing sheet 51 contains 5% or more of cellulose fibers having a freeness of 30 mL or more and 200 mL or less. [Selection] Figure 2

Description

  The present invention relates to absorbent articles such as paper diapers and urine pads.

  Conventionally, absorbent articles, such as a paper diaper, a urine pad, and a sanitary napkin, are known. The absorbent article is provided with an absorber that absorbs liquid such as urine and menstrual blood excreted from the wearer. Among excreta excreted from the wearer, liquid water such as urine and menstrual blood (hereinafter referred to as “excreted water”) is absorbed and held by the absorber.

  In the absorbent article, odor components may be generated from excreted water retained in the absorbent body or solid components that are not absorbed by the absorbent body such as feces, and may leak to the outside of the absorbent article. In addition, the odor diffuses to the outside, which may cause discomfort to the person and those around him. Thus, it has been proposed to adsorb odors by activated carbon by arranging a sheet containing activated carbon in an absorbent article (see Patent Document 1).

Japanese Patent Laying-Open No. 2015-070995

  An object of the present invention is to provide an absorbent article including a deodorizing sheet in which the sheet itself can take in and adsorb odor components.

  The absorptive article indicated here is provided with the absorber containing a superabsorbency polymer, and the deodorizing sheet arranged on the skin non-opposing surface side of the absorber. The deodorizing sheet contains 5% by mass or more of cellulose fibers having a freeness of 30 mL to 200 mL.

  According to the absorbent article shown in the present case, the odor can be suppressed by taking in and adsorbing the odor component by the deodorizing sheet itself.

It is an expanded view of the paper diaper (absorbent article) regarding embodiment. It is II-II arrow sectional drawing of FIG.

Hereinafter, the form for implementing this case is demonstrated. The following embodiment is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in this embodiment. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit thereof. Also,
They can be selected as necessary, and can be appropriately combined.

  The absorbent article described in the embodiment is a sanitary article that is attached to a wearer and absorbs and retains liquid moisture such as urine and menstrual blood excreted from the wearer. In addition to absorbent articles such as tape-type and pants-type disposable diapers (so-called “disposable diapers”), the absorbent article includes absorbent bodies such as urine pads, sanitary napkins, and panty liners. Also includes sex goods. In the following embodiment, a pants-type paper diaper is illustrated as an absorbent article.

  In this embodiment, about a paper diaper, let the direction which connects the front body arrange | positioned facing a wearer's abdomen and the back body arrange | positioned facing a back part be a longitudinal direction. Between these front body and back body (the center in the longitudinal direction), a crotch part disposed at the wearer's crotch (arranged facing the crotch) is located. In a state where a paper diaper is worn by the wearer (hereinafter abbreviated as “wearing state”), the side facing the wearer's skin (inner side) is defined as the skin facing surface side, and the opposite side (outer side) of the skin facing surface side. Is the non-skin facing side. Furthermore, a direction connecting the skin facing surface side and the skin non-facing surface side is a thickness direction, and a direction orthogonal to both the longitudinal direction and the thickness direction is a width direction. In addition, viewing from the thickness direction is a plan view.

  About the direction of each structure in a paper diaper, when expressing along a longitudinal direction, for example, it shall include not only parallel to a longitudinal direction but substantially parallel to a longitudinal direction. Specifically, it is assumed that the inclination angle with respect to the longitudinal direction extends below 45 ° along the longitudinal direction. Similarly, in the case where it is expressed along each direction such as the width direction and the thickness direction, it means that the inclination angle with respect to each direction extends below 45 °. In the present specification, for example, the description of a numerical range of “1 to 100” includes both the lower limit value “1” and the upper limit value “100”. This also applies to other numerical range notations.

[1. Constitution]
With reference to FIG.1 and FIG.2, the basic structure of the paper diaper 100 is demonstrated. In the cross-sectional view of FIG. 2, the thickness of each sheet is exaggerated in order to make it easy to grasp each configuration.

  In FIG. 1, a paper diaper 100 is formed symmetrically with respect to a center line A in the width direction. The paper diaper 100 is roughly divided into three regions along the longitudinal direction: a front body 100A, a crotch 100B, and a back body 100C. The crotch part 100B is an area located in the crotch of the wearer when the paper diaper 100 is worn.

The paper diaper 100 includes a laminated body 10 in a crotch part 100B. The laminate 10 includes an absorbent body 20 having an absorbent core 21. Moreover, the laminated body 10 includes a top sheet 31 provided on one main surface side of the absorbent body 20. Moreover, the laminated body 10 includes a back sheet 41 provided on the other main surface side of the absorbent body 20. That is, the laminate 10 is a mat-like laminate structure in which the top sheet 31, the absorber 20, and the back sheet 41 are laminated at least in this order. Further, the paper diaper 100 includes a deodorizing sheet 51 disposed on the non-skin facing surface side of the absorbent body 20.
Hereinafter, each component of the paper diaper 100 is demonstrated.

[Absorbent core]
The absorbent core 21 is a mat-like member that absorbs and holds a liquid. The absorbent core 21 includes a superabsorbent polymer (also called a superabsorbent polymer (SAP), a superabsorbent polymer or a superabsorbent resin) 22, and a fiber material 23. The absorbent core 21 is formed by mixing the superabsorbent polymer 22 with the fiber material 23. The fiber material 23 is formed by entwining ultrafine fibers having hydrophilicity. The superabsorbent polymer 22 is usually embedded and held in the fiber material 23 by being mixed with the fiber material 23. The superabsorbent polymer 22 can absorb and retain the liquid diffused by the fiber material 23.

<Superabsorbent polymer>
As the superabsorbent polymer 22, various known polymers that are used as absorbent materials in absorbent articles such as disposable diapers and urine pads can be used. Examples of the superabsorbent polymer 22 include starch systems such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and saponified starch-ethyl acrylate graft copolymer; sodium Cellulose-based materials such as a crosslinked product of carboxymethyl cellulose; synthetic polymer-based materials such as a crosslinked product of acrylic acid (salt) polymer and polyvinyl alcohol-maleic anhydride reaction can be used. These may be used individually by 1 type and may be used in combination of 2 or more type. The shape of the superabsorbent polymer 22 is not particularly limited, and for example, a granular shape, a powder shape, a pellet shape, a sol shape, a film shape, a fiber shape, and the like can be used.

<Fiber material>
Examples of the fiber material 23 include cellulosic fibers such as pulp fibers, rayon fibers, and cotton fibers; and synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate that have been subjected to a hydrophilic treatment. These may be used individually by 1 type and may be used in combination of 2 or more type.

〔Absorber〕
The absorbent body 20 is a mat-like (or pad-like) member having liquid absorbency that absorbs and retains liquid moisture such as urine and menstrual blood excreted from the wearer (hereinafter referred to as “excreted moisture”). As shown in FIG. 1, the disposable diaper 100 incorporates an absorbent body 20 that extends in the longitudinal direction over the front body 100A, the crotch 100B, and the back body 100C. Here, the hourglass-shaped absorber 20 in which the crotch part 100B is smaller in the width direction than the front body 100A and the back body 100C is illustrated. However, the shape of the absorbent body 20 in plan view is not limited to the hourglass shape as described above, but may be rectangular (that is, the dimension in the width direction is constant) in plan view, and each of the circular front body 100A and back body 100C. A dumbbell shape may be used.

  The absorbent body 20 has an absorbent core 21 and a wrap sheet 24. The absorbent body 20 is formed by encapsulating (wrapping) the absorbent core 21 with a wrap sheet 24. The wrap sheet 24 covers the entire absorbent core 21 including the skin facing surface side (upper surface side in FIG. 2) of the absorbent core 21 and the skin non-facing surface side (lower surface side in FIG. 2). is doing.

<Lap sheet>
The wrap sheet 24 is a sheet-like member that covers the absorbent core 21. Since the absorbent core 21 is encapsulated by the wrap sheet 24, the regularity of the absorbent core 21 is ensured.

  The wrap sheet 24 can be formed of a known material used for absorbent articles. For example, paper such as tissue paper; spunbond nonwoven fabric, needle punched nonwoven fabric, spunlace nonwoven fabric, air-through nonwoven fabric, SMS (Spunbound Meltblown Spunbound) nonwoven fabric and the like can be used.

[Laminate]
The laminated body 10 is a laminated structure in which a top sheet 31 and a back sheet 41 are respectively disposed on both main surface sides of the absorbent body 20. Among these, the top sheet 31 is disposed on the surface of the absorbent body 20 on the skin facing surface side. Further, the back sheet 41 is disposed on the surface of the absorbent body 20 on the skin non-facing surface side. The top sheet 31 and the back sheet 41 and the absorbent body 20 can be fixed by a known adhesive such as a hot melt adhesive.

<Top sheet>
The top sheet 31 is a sheet-like member that is disposed on the most skin facing surface side in the laminate 10. The top sheet 31 has a width dimension larger than that of the absorbent body 20 and covers the absorbent body 20 from the skin facing surface side. Moreover, the top sheet 31 contacts the wearer's skin in a state where the paper diaper 100 is mounted, and allows the absorbent 20 to absorb excretion moisture. For this reason, the top sheet 31 is made of a material having water permeability at least partly or entirely. Moreover, it is preferable that the top sheet 31 is comprised with a highly flexible material for the fitting property at the time of wear. Moreover, in order to suppress the stuffiness in a mounting state, it is preferable to be comprised with the material which has air permeability.

  As a material constituting the top sheet 31, for example, a woven fabric, a nonwoven fabric, a porous film, or the like can be used. Alternatively, the top sheet 31 may be a nonwoven fabric obtained by subjecting fibers of thermoplastic resin such as polypropylene, polyethylene, polyester, and nylon to a hydrophilic treatment. As the nonwoven fabric constituting the top sheet 31, a spunbond nonwoven fabric, a needle punched nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, a melt blown nonwoven fabric, an SMS nonwoven fabric, or the like can be used.

<Back sheet>
The back sheet 41 is a sheet-like member that is disposed on the most skin non-facing surface side in the laminate 10. The back sheet 41 prevents excrement from leaking from the absorbent body 20 to the skin non-facing surface side. For this reason, the backsheet 41 is made of a material having non-water permeability. Further, the backsheet 41 is preferably made of a material having moisture permeability in order to suppress stuffiness in the mounted state.

  As a material constituting the back sheet 41, for example, a thermoplastic resin sheet such as polyethylene or polypropylene can be used. Among them, as the back sheet 41, it is preferable to use a microporous thermoplastic resin sheet in which a plurality of fine pores of 0.1 to 0.4 μm are formed. As such a sheet, for example, a sheet obtained by kneading an inorganic filler in a thermoplastic resin and molding the sheet and then stretching the sheet can be used.

[Deodorization sheet]
The deodorizing sheet 51 is a sheet-like member that can reduce or remove odor. Although the mechanism of the odor suppression function by the deodorizing sheet 51 of this embodiment is not limited to this, it is estimated that it is based on the effect | action which adsorb | sucks an odor component physically by the cellulose fiber contained in the deodorizing sheet 51. FIG. The deodorizing sheet 51 contains 5% or more of cellulose fibers having a freeness of 30 mL to 200 mL. The deodorizing sheet 51 may contain, in addition to cellulose fibers having a freeness of 30 mL or more and 200 mL or less, cellulose fibers having a freeness of less than 30 mL, or cellulose fibers having a freeness of more than 200 mL. , Synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate may be included.

  The content of cellulose fibers having a freeness of 30 mL or more and 200 mL or less is usually 5% by mass or more, preferably 30% by mass or more, more preferably 50% by mass or more, in terms of solid content with respect to the total amount of the deodorizing sheet 51. Preferably it is 70 mass% or more, Usually 99 mass% or less, Preferably it is 95 mass% or less, More preferably, it is 90 mass% or less, More preferably, it is 80 mass% or less. When the content of the cellulose fiber is within the above range, the deodorizing action by the deodorizing sheet 51 is easily exhibited.

<Cellulose fiber>
As the cellulose fiber, various cellulose fibers used for the fiber material 23 can be used. Although it does not specifically limit as a material of a cellulose fiber, For example, natural cellulose fibers, such as a pulp, cotton, hemp, and wool; Regenerated cellulose fibers, such as rayon and a cupra; Purified cellulose fibers, such as a lyocell, etc. are mentioned. Among these, natural cellulose fiber is preferable and pulp fiber is more preferable in terms of fiber length, productivity, raw material price, and the like.

  Although it does not specifically limit as a raw material of a pulp fiber, For example, Wood pulp, such as a conifer, a hardwood; Non-wood pulp, such as kenaf, hemp, bamboo, firewood, bagasse; Waste paper pulp, such as deinked pulp which uses a waste paper as a raw material; The thing obtained from raw material pulps, such as these, is mentioned. Moreover, the manufacturing method of a pulp is not specifically limited, either, for example, mechanical pulp, such as groundwood pulp (GP), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP); kraft pulp (KP) , Sulfide pulp (SP), etc .; These may be used individually by 1 type and may be used in combination of 2 or more type. The pulp fiber may be unbleached pulp or bleached pulp. Further, it may be beaten or not beaten. Among these, mechanical pulp is preferable from the viewpoint of being relatively low-density and bulky and obtaining the desired freeness described later. That is, it is preferable to contain mechanical pulp fibers derived from mechanical pulp as cellulose fibers.

  The content of the mechanical pulp fiber in the fiber composition contained in the deodorizing sheet 51 is not particularly limited, but is preferably 50% by mass or more, more preferably 70% by mass or more, preferably 100% by mass or less, more preferably 80%. It is below mass%. In the present specification, the content of mechanical pulp means a value obtained by measuring a test piece of the deodorizing sheet 51 according to a paper, paperboard and pulp-fiber composition test method (JIS P 8120: 1998).

<Basis weight>
The basis weight of the deodorizing sheet 51 is not particularly limited, but is preferably 20 g / m ² or more, more preferably 30 g / m ² or more, further preferably 40 g / m ² or more, preferably 200 g / m ² or less. Preferably it is 150 g / m ² or less, more preferably 100 g / m ² or less. When the basis weight of the deodorizing sheet 51 is equal to or more than the above lower limit, an odor suppressing function is easily exhibited. Moreover, it is easy to obtain a sufficient strength against deformation caused by use. When the basis weight of the deodorizing sheet 51 is equal to or less than the above upper limit, the stickiness is suppressed and the fit feeling tends to be good.

<Drainage>
The freeness represents the roughness of the network structure of the cellulose fibers contained in the deodorizing sheet 51. When the drainage is low, the pulp fibers contained in the cellulose fibers tend to be fine and have a dense network structure. Therefore, in this case, the surface area in the deodorizing sheet 51 is relatively large, and the adsorption performance of odor components tends to be high. When the drainage is high, the pulp fibers contained in the cellulose fibers tend to be thick and have a coarse network structure. Therefore, in this case, the surface area in the deodorizing sheet 51 is relatively small, and the odor component adsorption performance tends to be low.

  In this specification, the freeness is a value obtained by measuring an aqueous suspension of a raw material of pulp fiber used for the preparation of the deodorizing sheet 51 in accordance with the Canadian Standard Freeness Method (JIS P8121-2: 2012). means. The freeness of the deodorizing sheet 51 can be controlled to a desired value by adjusting the type of pulp fiber to be used and the beating conditions when beating the raw material to produce cellulose fibers. In the deodorizing sheet 51 of this embodiment, the freeness is adjusted to a desired value by using mechanical pulp fibers. When two or more kinds of pulp are used, the pulps beaten separately may be mixed to bring the freeness to the above range, and the premixed pulp is beaten to adjust the freeness to the above range. Also good.

  The freeness is usually 30 mL or more, preferably 40 mL or more, more preferably 50 mL or more, further preferably 70 mL or more, and is usually 200 mL or less, preferably 150 mL or less, more preferably 120 mL or less. When the freeness is equal to or more than the above lower limit value, sufficient voids are generated in the deodorizing sheet 51 between the cellulose fibers contained in the deodorizing sheet 51 and the surface area tends to increase. Therefore, it is easy to adsorb odor components inside. When the freeness is not more than the above upper limit, the fiber becomes thick but the surface area does not become too small, and a sufficient deodorizing function can be expressed.

<Porous particles>
The deodorizing sheet 51 may contain porous particles as a filler in addition to cellulose fibers. The porous particles have a porous structure having pores therein, and improve the deodorizing function by physically adsorbing odor components.

  As the porous particles, inorganic or organic particles having a known porous structure can be used. Specific examples of the porous particles include carbonaceous particles such as activated carbon, charcoal and carbon; mineral particles such as diatomaceous earth, talc and zeolite; metal oxides such as silica, alumina, titanium oxide, magnesium oxide and zirconium oxide. Particles; metal carbonate particles such as sodium carbonate, calcium carbonate, barium carbonate; metal hydroxides such as aluminum hydroxide, calcium hydroxide, and magnesium hydroxide; metal silicate particles such as aluminum silicate and calcium silicate; Examples thereof include metal phosphate particles such as calcium phosphate and zirconium phosphate. These may be used individually by 1 type and may be used in combination of 2 or more type. Among these, metal oxide particles are preferable and silica is more preferable from the viewpoint of adsorption performance of odor components and cost.

  The average particle diameter of the porous particles is not particularly limited, but is preferably 0.1 μm or more, more preferably 1 μm or more, preferably 500 μm or less, more preferably 100 μm or less. When the average particle diameter of the porous particles is not less than the above lower limit, the deodorizing function is likely to be enhanced. When the average particle size of the porous particles is not more than the above upper limit, the formability of the deodorizing sheet 51 during papermaking is likely to be improved.

  The content of the porous particles is not particularly limited, but is preferably 0.1% by mass or more, more preferably 1% by mass or more, and preferably 20% by mass or less in terms of solid content with respect to the total amount of the deodorizing sheet 51. More preferably, it is 10 mass% or less. When the content of the porous particles is not less than the above lower limit value, the deodorizing function tends to be enhanced. When the content of the porous particles is not more than the above upper limit value, the formability during papermaking is easily improved, which is preferable from the viewpoint of cost.

<Other additives>
The deodorizing sheet 51 may contain various known additives in addition to cellulose fibers. By including an additive, the physical properties and surface performance of the deodorizing sheet 51 can be adjusted.

  Examples of the additive include an internal sizing agent, a yield improver, a freeness improver, a dry paper strength enhancer, a wet paper strength enhancer, a bulking agent, a softener, a pH adjuster, an antifoaming agent, and a coagulant. , Pitch control agents, slime control agents, colorants, dyes, fluorescent dyes and the like.

<Manufacturing method>
The deodorizing sheet 51 can be manufactured using a known paper manufacturing method. For example, it can be manufactured by mixing raw materials of cellulose fibers such as pulp fibers, and if necessary, porous particles and additives and making paper using a paper machine.

[Side sheet, cover sheet]
The paper diaper 100 further includes a side sheet 61 and a cover sheet 62 that are stacked on the stacked body 10. The side sheet 61 is disposed on the lateral side of the stacked body 10.
Further, the cover sheet 62 is disposed on the skin non-facing surface side of the laminate 10. The side sheet 61, the cover sheet 62, and the laminated body 10 can be fixed by a known adhesive such as a hot melt adhesive.

<Side sheet>
The side sheet 61 is a member for forming the three-dimensional gathers 71 on both sides of the laminated body 10. The side sheet 61 is provided on each side of the sheets 31 and 41 in the width direction. The side sheet 61 is laminated on the skin facing surface side in the width direction side portion of the top sheet 31, and is laminated on the skin facing surface side in the width direction side portion of the back sheet 41.

  The side sheet 61 is preferably made of a non-permeable material in order to prevent liquid leakage to the side in the width direction. As the side sheet 61, a spunbond nonwoven fabric can be used. Further, a part of the side sheet 61 is disposed on the most skin-facing surface side in the paper diaper 100 (for this reason, the side sheet 61 is also referred to as a “top sheet” similarly to the top sheet 31). As the side sheet 61 that can come into contact with the wearer in this way, a spunbonded nonwoven fabric with improved flexibility is used by including a meltblown layer such as an SMS nonwoven fabric or an SMMS (Spunbound Meltblown Meltblown Spunbound) nonwoven fabric. Is preferred. Or it is preferable to use the spunbond nonwoven fabric which improved the softness | flexibility by suppressing the fineness and the fabric weight of the fiber which make a spunbond nonwoven fabric.

The “fineness” is a parameter corresponding to the fiber diameter (thickness) and the cross-sectional area of the fiber, and is represented by the weight per predetermined length. For example, the number of grams per 9000 m (denier) for one fiber is used as the “fineness”.
Further, the “weight per unit area” is a parameter corresponding to the thickness of the sheet or the degree of lamination, and is represented by the weight per unit area. For example, the number of grams per square meter is used as the “weight per unit area”.

<Cover sheet>
The cover sheet 62 is a sheet-like member that covers the laminated body 10 from the skin non-facing surface side. The cover sheet 62 is used to reinforce the back sheet 41 and improve the feel (tactile sensation) of the back sheet 41 by being disposed on the non-skin facing surface side of the paper diaper 100. Here, the cover sheet 62 is overlapped via the side sheet 61 on the side in the width direction of the back sheet 41. As the cover sheet 62, three of a first cover sheet 63, a second cover sheet 64, and a third cover sheet 65 are laminated in this order from the skin facing surface side to the skin non-facing surface side.

The first cover sheet 63 covers the absorbent body 20 from the skin non-opposing surface side through the back sheet 41 (from this, the first cover sheet 63 is also referred to as “pad cover sheet”).
The second cover sheet 64 and the third cover sheet 65 are set to have a size in the width direction larger than that of the first cover sheet 63 in the front body 100A and the back body 100C (see FIG. 1). Placed around the belly, etc. The third cover sheet 65 is disposed on the most skin non-facing surface side in the paper diaper 100 (the third cover sheet 65 is also referred to as an “outer cover sheet”, and the second cover sheet 64 is the “inner cover sheet”. ").

  Examples of the material constituting the cover sheet 62 include a woven fabric and a non-woven fabric. Especially, it is preferable to use the nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester. In particular, a spunbonded nonwoven fabric can be suitably used as the cover sheet 62 from the viewpoint of flexibility in order to ensure a feeling of touch (hand).

  As shown in FIG. 1, the cover sheet 62 in the front body 100A and the cover sheet 62 in the back body 100C are attached to each other in the width direction edge 62a (so-called “side seal”). In this manner, the cover sheets 62 of the front body 100A and the back body 100C are continuously provided, and the pant-type paper diaper 100 is formed.

〔gather〕
Next, the gathers 70 of the disposable diaper 100 will be described with reference to FIGS. 1 and 2.
Gather 70 is a sheet composite that has elasticity by sandwiching a stretchable member (stretchable member) such as rubber, polyurethane, and stretchable film between sheets of nonwoven fabric in a stretched state and fixing with hot melt or the like. Consists of This sheet composite is in a state in which fine wrinkles are offset on a sheet such as a nonwoven fabric by a force (restoring force, elastic force) for the elastic member to return from the stretched state to the original (natural length state). Here, a thread-like rubber member (hereinafter abbreviated as “thread rubber”) 80 is exemplified as the stretchable member.

  In this paper diaper 100, three types of gathers 71, 72, 73 to which stretchability is imparted by three types of thread rubbers 81, 82, 83 are illustrated as gathers 70 formed of the thread rubber 80. One is a three-dimensional gather 71 (also referred to as “side gather”) in which the skin facing surface side edge portion of the side sheet 61 is gathered together by the first thread rubber 81. The other is a tammy gather 72 in which the second cover sheet 64 and the third cover sheet 65 (see FIG. 2) are gathered together by the second rubber thread 82 (a reference numeral is attached to only one place). The other is a second three-dimensional gather 73 (not shown in FIG. 1) in which the edge in the width direction is crushed by the third thread rubber 83 (not shown in FIG. 1) on the side of the side sheet 61 that is not facing the skin. is there.

  The three-dimensional gather 71 is provided in order to prevent the excrement from leaking to the side in the width direction by enhancing the followability to the wearer at the periphery of the excretion location. Specifically, as shown in FIG. 2, in the three-dimensional gather 71, the sheet portions 61 a and 61 b located at the inner edge in the width direction on the skin facing surface side of the side sheet 61 are folded and overlapped. The first thread rubber 81 extending in the longitudinal direction is surrounded by the sheet portions 61a and 61b.

  The tammy gather 72 is provided in order to enhance the followability to the wearer's buttocks and lower abdomen. More specifically, in the Tammy gather 72, a plurality of second thread rubbers 82 extending in the width direction, such as warp yarns or warp yarns in a plain woven fabric, are formed on the second cover sheet 64 and the third cover sheet 65 (see FIG. 2). Intervened in between.

The second three-dimensional gather 73 is provided in order to improve followability in the crotch part 100B. More specifically, in the second three-dimensional gather 73, the third thread rubber 83 is provided at the outer edge portion in the width direction on the skin non-facing surface side of the side sheet 61.
In addition, in addition to or in place of the above-described gathers 71, 72, 73, leg gathers may be provided for enhancing the follow-up of the wearer's legs.

[2. Action and effect]
Since the disposable diaper 100 of the present embodiment is configured as described above, the following operations and effects can be obtained.

(1) The paper diaper 100 includes an absorbent body 20 and a deodorizing sheet 51 disposed on the skin non-facing surface side of the absorbent body 20. The deodorizing sheet 51 contains a predetermined amount of cellulose fibers having a predetermined freeness, so that there is a gap between the fiber structures of the cellulose fibers included in the deodorizing sheet 51, and the surface area of the sheet is increased. Therefore, the odor component produced from the wearer's excrement can be taken into and adsorbed in the gap. Therefore, when the disposable diaper 100 is worn, the deodorized sheet 51 disposed on the outer side of the absorbent body 20 with respect to the skin surface of the wearer, or the excrement held by the absorbent body 20 or the absorbent body 20 and the skin surface. It is possible to suppress the spread of odors from excreta present in between. Moreover, after use, the absorbent body 20 can be wrapped together with the excrement by curling the paper diaper 100 with the absorbent body 20 on the inner side and the deodorizing sheet 51 on the outer side, and the spread of odor can be suppressed. Moreover, according to the deodorizing sheet 51, an odor component can be adsorbed by the deodorizing sheet 51 itself. For this reason, compared with the case where a deodorizer like activated carbon is enclosed in the inside of a bag-like deodorizing bag, for example, thickness becomes thin and the paper diaper 100 can be made compact. Moreover, by using the deodorization sheet | seat 51, even if thickness is comparatively thin, an odor can be suppressed and it can prevent that the fall of a feeling of fitting at the time of wear and obstruction of a wearer's operation | movement are prevented. Moreover, according to the deodorizing sheet 51, even if the paper diaper 100 is damaged and the deodorizing sheet 51 is broken, the deodorant like the above-described deodorizing bag is not scattered.

(2) Moreover, in the paper diaper 100, the cellulose fiber contains the mechanical pulp fiber. Thereby, a cellulose fiber is comparatively bulky and has a low density. Therefore, the odor component is taken into the deodorizing sheet 51 and is easily adsorbed. Therefore, the paper diaper 100 can further improve the odor suppressing function.

(3) Moreover, in the paper diaper 100, the deodorizing sheet 51 contains porous particles. Thereby, in addition to cellulose fiber, an odor component can be taken in and adsorbed by porous particles. Furthermore, because of the large surface area of the cellulose fiber itself, a large number of porous particles can be held on the inner surface of the deodorizing sheet 51. Therefore, the paper diaper 100 can synergistically improve the odor suppressing function.

(4) Furthermore, the paper diaper 100 includes a water-impermeable back sheet 41. The back sheet 41 is disposed on the skin non-facing surface side of the absorbent body 20 and on the skin facing surface side of the deodorizing sheet 51. Thus, by providing the back sheet 41 between the absorbent body 20 and the deodorizing sheet 51, moisture such as urine contained in the absorbent body 20 can be prevented from penetrating into the deodorizing sheet 51. Thereby, the water | moisture content osmose | permeates the inside of the deodorizing sheet | seat 51, and it can prevent the situation which the penetration | infiltrated water | moisture content interferes and it becomes difficult to take in an odor component. In this way, in the paper diaper 100, the back sheet 41 can suppress a decrease in the odor suppression function. Moreover, since the deodorizing sheet 51 is provided so as to cover the entire skin non-opposing surface side of the absorbent body 20 in plan view, the absorbent body 20 can be encapsulated from the skin non-opposing surface side. Therefore, after use, by wrapping the paper diaper 100 with the absorbent body 20 on the inside and the deodorizing sheet 51 on the outside, the absorbent body 20 is wrapped together with the excrement, and the spread of odor can be further suppressed. it can.

[3. Others]
[About layer structure]
In the above description, the case where the layers of the top sheet 31, the absorbent body 20, the back sheet 41, the deodorizing sheet 51, and the cover sheet 62 are laminated in this order has been described as an example. If the paper diaper 100 is a layer structure provided with the deodorizing sheet 51, it will not be limited to this, You may change suitably. For example, the paper diaper 100 may include a plurality of deodorizing sheets 51 instead of only one. Further, a deodorizing sheet 51 may be provided between the absorbent body 20 and the back sheet 41. Moreover, the deodorizing sheet 51 may be provided on the skin non-facing surface side of the cover sheet 62, that is, on the outermost surface side of the disposable diaper 100. Moreover, the back sheet | seat 41 may function as the deodorizing sheet | seat 51 by containing the cellulose fiber mentioned above. However, in this case, it is preferable that the back sheet 41 has both water permeability and moisture permeability. Moreover, the cover sheet 62 may function as the deodorizing sheet 51 by containing the cellulose fibers described above.

[About deodorizing sheet]
In the above description, the case where the length in the width direction of the deodorizing sheet 51 is substantially the same as the length in the width direction of the side sheet 61 has been described with reference to FIG. The shape of the deodorization sheet | seat 51 is not limited to this, You may change suitably. For example, the deodorizing sheet 51 may wrap around the edge in the width direction of the side sheet 61 and further extend upward in the thickness direction. In this case, the deodorization sheet | seat 51 can be located not only below the absorber 20 and the side sheet | seat 61 but a side, and can surround those circumference | surroundings. Therefore, when wearing the paper diaper 100, in addition to the odor spreading from below the absorber 20, the odor spreading from the side of the absorber 20 can be taken in and adsorbed without leaking.

  Hereinafter, the present invention will be specifically described with reference to examples. In addition, the material, usage-amount, ratio, the processing content, processing procedure, etc. which are shown in the following Examples can be suitably changed unless it deviates from the meaning of this invention. Therefore, the present invention is not limited to the following examples.

[Evaluation method]
About the absorbent article obtained from the following example and the comparative example, physical property evaluation was performed according to the following evaluation method and evaluation criteria.

<Drainage>
The pulp fibers obtained in the production examples were measured according to the Canadian standard freeness method (JIS P8121-2: 2012).

<Odor test>
A solution in which 0.1 mg of urease is dissolved in 80 ml of fresh urine is added, dripped onto the center of the absorbent article, sealed in a 5-liter wide-mouth bottle, and stored in a thermostat set at 37 ° C. for 10 hours. Thereafter, the bottle lid is opened in the odorless room to smell the odor, and the odor intensity is evaluated in the following six stages. Evaluation is carried out by 10 panelists whose odor judgment ability has been confirmed by the T & T olfactometer method, and the average value is obtained.
5: There is no smell.
4: The odor is slightly felt.
3: Odor is felt.
2: The odor is felt strongly.
1: The odor is felt intensely.

[Production Example 1: Method for producing mechanical pulp fiber]
A commercially available bleached thermo-chemimechanical pulp (hereinafter BCTMP) was beaten with a single disc refiner to a CSF (Canadian Standard Freeness) of 35 mL with a pulp concentration of 4% to obtain a pulp fiber of Production Example 1. The freeness of the obtained pulp fiber was evaluated. The evaluation results are shown in Table 1.

[Production Example 2: Method for producing mechanical pulp fiber]
A commercially available bleached thermochemimechanical pulp (hereinafter BCTMP) was beaten with a single disc refiner at a pulp concentration of 4% to CSF of 120 mL to obtain pulp fibers of Production Example 2. The freeness content of the obtained pulp fiber was evaluated. The evaluation results are shown in Table 1.

[Production Example 3: Method for producing mechanical pulp fiber]
A commercially available bleached thermo-chemimechanical pulp (hereinafter BCTMP) was beaten with a single disc refiner at a pulp concentration of 4% to CSF 20 mL to obtain pulp fiber of Production Example 3. The freeness content of the obtained pulp fiber was evaluated. The evaluation results are shown in Table 1.

[Production Example 4: Production method of kraft pulp fiber]
A commercially available bleached kraft pulp (hereinafter BCTMP) was beaten with a single disc refiner at a pulp concentration of 4% up to 300 mL of CSF to obtain pulp fibers of Production Example 4. The freeness content of the obtained pulp fiber was evaluated. The evaluation results are shown in Table 1.

[Example 1]
Using the pulp fibers of Production Example 1, other fibers and porous particles were blended so as to have the contents shown in Table 1, and papermaking was performed. Subsequently, drying treatment etc. were performed and the deodorizing sheet was obtained. Using the obtained deodorizing sheet, the disposable diaper of Example 1 having the configuration shown in FIG. 2 was produced.
As the absorber, a rectangular absorber (width 100 mm × length 395 mm × thickness 4 mm) was used. The absorptive core contained in this absorber is obtained by blending 85 parts by mass of SAP with respect to 100 parts by mass of fluff pulp.
As the top sheet, a commercially available air-through nonwoven fabric (weight per unit area: 25 gsm) subjected to hydrophilic treatment was used.
As a backsheet, a polyethylene film (thickness: 25 μm) in which many micropores were formed was used.
A commercially available SMS polypropylene non-woven fabric (weight per unit area 13 gsm, water pressure resistance 200 mmH ₂ O) was used as the side sheet.
As the cover sheet, a commercially available spunbond nonwoven fabric (weight per unit area: 15 gsm) was used.
As an adhesive between sheets, a hot melt resin containing 20% by mass of a hydrogenated derivative of a styrene-diene block copolymer, 50% by mass of a tackifier (petroleum resin) and 30% by mass of a plasticizer (paraffinic oil) is used. It was.
The odor test was evaluated for the obtained absorbent article. The evaluation results are shown in Table 1.

[Examples 2 and 3, Comparative Example 1]
Absorbency of Example 2 in the same manner as in Example 1 except that the pulp fiber of Production Example 1 in Example 1 and the content of other fibers were changed to the contents of Table 1 to obtain a deodorizing sheet. An article was obtained. Moreover, the pulp fiber of the manufacture example 1 in Example 1 was changed into the pulp fiber of the manufacture example 2, and the content of pulp fiber and another fiber was changed into content of Table 1, and the deodorizing sheet was obtained. In the same manner as in Example 1, an absorbent article of Example 3 was obtained. Furthermore, the absorbent article of Comparative Example 1 was obtained in the same manner as in Example 3 except that the content of pulp fibers and other fibers was changed to the content shown in Table 1 to obtain a deodorizing sheet.
The odor test was evaluated for the obtained absorbent article. The evaluation results are shown in Table 1.

[Comparative Example 2]
An absorbent article of Comparative Example 2 was obtained in the same manner as in Example 2 except that the pulp fiber of Production Example 1 in Example 2 was changed to the pulp fiber of Production Example 3 to obtain a deodorizing sheet.
The odor test was evaluated for the obtained absorbent article. The evaluation results are shown in Table 1.

[Comparative Example 3]
An absorbent article of Comparative Example 3 was obtained in the same manner as in Example 2 except that the pulp fiber of Production Example 1 in Example 2 was changed to the pulp fiber of Production Example 4 to obtain a deodorizing sheet.
The odor test was evaluated for the obtained absorbent article. The evaluation results are shown in Table 1.

〔Consideration〕
As shown in Table 1, although the freeness included cellulose fibers having a predetermined range, Comparative Example 1 having a low content had an insufficient odor suppressing function. Moreover, also in the comparative example 2 containing the cellulose fiber with low freeness, the odor suppression function was insufficient. Furthermore, even in Comparative Example 3 including cellulose fibers having a high freeness, the function of suppressing odor was insufficient.
On the other hand, in Examples 1 to 3 including a predetermined amount of cellulose fiber having a freeness within an appropriate range, the function of suppressing odor was exhibited.

DESCRIPTION OF SYMBOLS 100 Paper diaper 10 Laminated body 20 Absorber 21 Absorbent core 22 Superabsorbent polymer 23 Fiber material 24 Wrap sheet 31 Top sheet 41 Back sheet 51 Deodorizing sheet 61 Side sheet 62 Cover sheet 70 Gather 80 Yarn rubber (elastic member)

Claims (4)

An absorber comprising a superabsorbent polymer;
A deodorizing sheet disposed on the skin non-facing surface side of the absorber,
The said deodorizing sheet contains 5 mass% or more of cellulose fibers whose freeness is 30 mL or more and 200 mL or less, Absorbent article characterized by the above-mentioned. The cellulose fiber contains mechanical pulp fiber,
The absorbent article according to claim 1. The deodorizing sheet contains porous particles;
The absorbent article according to claim 1 or 2. A non-permeable back sheet disposed on the skin non-facing surface side of the absorbent body and the skin facing surface side of the deodorizing sheet;
The deodorizing sheet covers the entire skin non-opposing surface side of the absorber in plan view, and the absorber can be encapsulated from the skin non-opposing surface side.
The absorptive article according to any one of claims 1 to 3.

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