TWI837420B - Functional sheets, absorbent articles containing the functional sheets, and methods of manufacturing the same - Google Patents

Abstract

The problem to be solved by the present invention is to provide a functional sheet and an absorbent article having the functional sheet, and a method for manufacturing the functional sheet, wherein the functional sheet improves softness without hindering the moisture absorption and other properties of micro-fibrous cellulose as much as possible. In order to solve this problem, the functional sheet of the present invention is characterized in that at least one of the aggregates of micro-fibrous cellulose and its aggregated particles containing a moisturizing agent is attached to the sheet. Furthermore, the absorbent article of the present invention is characterized in that it comprises: a liquid-permeable top sheet 30 covering the inner surface of an absorbent body 56; a liquid-impermeable resin film 11 having moisture permeability covering the outer surface of the absorbent body 56; and a moisture-permeable outer nonwoven fabric 12 covering the outer surface of the liquid-impermeable resin film; wherein at least any one of the liquid-permeable top sheet 30, the liquid-impermeable resin film 11 and the outer nonwoven fabric 12 is the functional sheet.

Description

Functional sheet and absorbent article having the same, and method for producing the same

The present invention relates to functional sheets, disposable diapers such as pants-type diapers and adhesive diapers, absorbent articles such as sanitary napkins, and methods for producing the same.

In order to add moisture absorption function to absorbent articles such as disposable diapers and sanitary napkins (Patent Documents 2 and 3), an absorbent article has been proposed in which an aqueous dispersion of microfibrillar cellulose is applied to a desired area and then dried (for example, see Patent Document 1).

However, the fine fibrous cellulose aggregate particles obtained by drying the aqueous dispersion of fine fibrous cellulose are hard, and if they are attached to a somewhat soft sheet such as a nonwoven fabric or a resin film (most of the sheets used in absorbent articles are such sheets), there is a problem that the attached portion becomes hard.

[Prior technical documents] (Patent documents) Patent document 1: Japanese Patent No. 6442098 Patent document 2: Japanese Patent No. 2005-504591 Patent document 3: Japanese Patent No. 6445732

[Problems that the invention aims to solve] Thus, the main problem that the invention aims to solve is to minimize the obstruction of the moisture absorption and other properties of micro-fibrous cellulose and to improve the softness.

[Technical means for solving the problem] The functional sheet that solves the above-mentioned problem, the absorbent article having the functional sheet, and the manufacturing method thereof are as follows.

<First Aspect> A functional sheet characterized in that at least one of the aggregates of micro-fibrous cellulose and aggregated particles thereof containing a moisturizing agent is attached to the sheet.

(Effect) This functional sheet has the characteristic that at least one of the micro-fibrous cellulose and its aggregated particles is attached to the sheet as an aggregate that has not yet completely dried and solidified using a moisturizing agent. This aggregate is moist and difficult to dry, so it becomes a soft aggregate. In addition, the micro-fibrous cellulose is made into an aggregate containing a moisturizing agent and attached to the sheet, so it becomes an aggregate that is not easy to damage the characteristics such as moisture absorption.

<Second Aspect> The functional sheet as described in the first aspect, wherein the agglomerate comprises: 0.25 to 1.0 parts by mass of the micro-fibrous cellulose and its aggregated particles relative to 1 part by mass of the moisturizing agent.

(Effects) The blending of the amount of plasticizer and the amount of micro-fibrous cellulose in this functional sheet is suitable for ensuring the softness of the functional sheet. In addition, the functional sheet containing the aggregates of this blending becomes a sheet material that hardly feels sticky.

<Third Aspect> An absorbent article characterized by comprising: a liquid-permeable top sheet covering the inner surface of an absorbent body; a liquid-impermeable resin film having moisture permeability covering the outer surface of the absorbent body; and, a moisture-permeable outer nonwoven fabric covering the outer surface of the liquid-impermeable resin film; wherein, at least any one of the liquid-permeable top sheet, the liquid-impermeable resin film and the outer nonwoven fabric is a functional sheet as described in the first aspect or the second aspect.

(Effect) If micro-fibrous cellulose is placed on a liquid-permeable and moisture-permeable sheet, moisture emitted from an absorbent body that absorbs excrement etc. is absorbed by the micro-fibrous cellulose. This promotes the drying of the functional sheet constituting the absorbent article, and as a result, it is possible to suppress stuffiness. In addition, since the aggregate contains a moisturizing agent, even if the functional sheet (the functional sheet in this case may be any of a top sheet, a liquid-impermeable resin film, and an outer nonwoven fabric) has micro-fibrous cellulose, it can be a soft absorbent article that is not hard.

<Fourth Aspect> An absorbent article as described in the third aspect, wherein the outer nonwoven fabric is a functional sheet as described in the first aspect or the second aspect, the agglomerate is provided on one surface of the functional sheet, the coating amount of the agglomerate is set to be less than 13.0 g/ ^m2 , and the one surface is the outer surface of the outer nonwoven fabric.

(Effect) The amount of agglomerates applied is less than 13.0g/ ^m2 , so even if the skin touches the outer layer of the product, it will not feel sticky or hard. The outer nonwoven fabric is soft, and the wrinkles formed by the previous micro-fibrous cellulose (wrinkles will be described later) are not conspicuous, making it an absorbent article with a natural touch outer layer.

Furthermore, in conventional absorbent articles, increasing the moisture permeability of the liquid-impermeable resin film in order to prevent stuffiness has the opposite effect. If the moisture released by the excrement absorbed into the absorbent body is retained by the outer surface of the product or underwear, it may be mistakenly perceived as wet when touched by hand. This problem can be solved by reducing the moisture permeability of the liquid-impermeable resin film, but this cannot avoid reducing the ability to prevent stuffiness.

In this aspect, micro-fibrous cellulose is provided on the outer surface of the outer non-woven fabric covering the outer surface of the product. Moisture that has passed through the liquid-impermeable resin film is absorbed by the micro-fibrous cellulose. Therefore, the outer non-woven fabric itself does not get wet, and it becomes a product that is not easy to feel that the outer side of the product is wet.

<Fifth Aspect> The absorbent article as described in the third aspect, wherein the outer nonwoven fabric is a functional sheet as described in the first aspect or the second aspect, the agglomerate is provided on one surface of the functional sheet, the one surface being the inner surface of the outer nonwoven fabric.

(Effect) If the amount of condensate applied is more than 13g/ ^m2 and it feels sticky, the inner surface of the outer nonwoven fabric does not touch the skin, so the user does not feel sticky. In addition, if the condensate is applied as much as possible, the amount of micro-fibrous cellulose contained in the condensate is large, so it can absorb more moisture.

<Sixth Aspect> An absorbent article as described in any one of the third to fifth aspects, wherein the liquid-permeable top sheet is a functional sheet as described in the first or second aspect, the agglutinate is provided on one surface of the functional sheet, the coating amount of the agglutinate is set to be less than 13.6 g/ ^m2 , and the one surface is the inner surface of the liquid-permeable top sheet.

(Effect) The inner surface of the top sheet is the part that directly contacts the crotch of the wearer, and it is desired that the top sheet prevents the wearer's skin from getting irritated even in hot weather. In this way, the top sheet can also be a sheet with moisture absorption, but the top sheet with cellulose fibers disclosed in the previous patent document 1 is hard and not a sheet with good touch.

In this aspect, even if micro-fibrous cellulose and aggregated particles thereof are attached to the top sheet, the top sheet still has excellent softness because it contains a moisturizer. Furthermore, the micro-fibrous cellulose absorbs moisture due to its hygroscopicity, thereby suppressing stuffiness and making the skin part in contact with the top sheet less likely to be inflamed.

<Seventh Aspect> The absorbent article as described in the sixth aspect, wherein the aforementioned agglomerate disposed on the aforementioned inner surface of the aforementioned moisture-permeable top sheet has a linear portion continuous in the front-to-back direction and a stripe-like portion arranged at intervals in the width direction.

(Effect) In conventional absorbent articles, excrement passes through the top sheet toward the absorbent body and is absorbed. However, if the wearer excretes in an unbalanced posture, the excrement may flow in the width direction of the top sheet, which may cause leakage. According to this aspect, the aforementioned agglomerates are arranged in stripes in the front-to-back direction at intervals in the width direction, and the moisture adsorption effect of the micro-fibrous cellulose makes it easy for the excrement to diffuse in the front-to-back direction where the agglomerates are arranged, resulting in the effect of suppressing the excrement from flowing in the width direction.

<Eighth Aspect> A method for manufacturing an absorbent article, characterized by comprising: a step of mixing a micro-fibrous cellulose dispersion with a moisturizing agent to obtain an aggregate; a step of applying the aforementioned aggregate on a sheet to obtain a functional sheet; and, a step of setting the aforementioned functional sheet as at least one of a liquid-permeable top sheet, a liquid-impermeable resin film, and an outer nonwoven fabric in the absorbent article; wherein, the absorbent article comprises: the aforementioned liquid-permeable top sheet, which covers the inner surface of the absorbent body; the aforementioned liquid-impermeable resin film with moisture permeability, which covers the outer surface of the absorbent body; and the aforementioned outer nonwoven fabric with moisture permeability, which covers the outer surface of the liquid-impermeable resin film.

(Effect) The effect described in any of the third to seventh aspects can be exerted.

[Effect of the invention] According to the present invention, a functional sheet and an absorbent article having the functional sheet, as well as a method for manufacturing the functional sheet, are provided, wherein the functional sheet has improved softness while minimizing the hygroscopicity of micro-fibrous cellulose.

Hereinafter, as a mode for implementing the invention, an example of a stick-on disposable diaper is shown and described. Figures 1 to 7 show an example of a stick-on disposable diaper. The symbol X in the figure represents the full width of the diaper excluding the connecting tape, and the symbol L represents the full length of the diaper. The components in the cross-sectional view are joined by an adhesive as a joining means. The adhesive can be formed by applying the hot melt adhesive to the entire surface, bead coating, curtain coating, key area coating, spiral coating, or pattern coating (transferring the hot melt adhesive by relief printing), or, alternatively or in parallel, can be applied to the outer peripheral surface of the elastic member by applying the hot melt adhesive to the fixing portion of the elastic member by comb-type spray gun or rubber band nozzle coating. As the hot melt adhesive, there are no particular restrictions, and there are types of hot melt adhesives such as EVA (ethylene-vinyl acetate copolymer), adhesive rubber (elastic system), olefin, polyester and polyamide. As a means of fixing or joining the components, a material welding means such as heat sealing and ultrasonic sealing can be used. The mass per unit area of the hot melt adhesive can be set to 1 to 40 g/ ^m2 . By setting it within this range, the adhesive application parts on the opposing surfaces of the two adjacent components can be firmly bonded.

The adhesive type disposable diaper has an absorbent body 56, a liquid permeable top sheet 30 covering the inner surface of the absorbent body, a liquid impermeable resin film 11 covering the outer surface of the absorbent body 56, and an outer nonwoven fabric 12 covering the outer surface of the liquid impermeable resin film and constituting the outer surface of the product. Symbol F represents the abdominal part located more forward than the center in the front-back direction, and symbol B represents the back part located more backward than the center in the front-back direction.

The raw materials and characteristic parts of each component are described in order below. (Absorbent) The absorbent 56 is a part that absorbs and retains body fluids such as excrement and blood, and can be formed by fiber aggregate particles. As the fiber aggregate particles, in addition to the short fibers such as cotton pulp and synthetic fibers being fiberized, long fiber aggregate particles can also be used, which are obtained by opening the filament bundles (fiber bundles) of synthetic fibers such as cellulose acetate as needed. As for the mass per unit area of the fiber, when cotton pulp or short fibers are fiberized, it can be set to, for example, about 100 to 300 g/ ^m2 , and when it is a long fiber aggregate particle, it can be set to, for example, about 30 to 120 g/ ^m2 . When it is a synthetic fiber, the fiber density is, for example, 1 to 16 dtex, preferably 1 to 10 dtex. When it is a long fiber aggregate particle, the long fiber can be a non-curled fiber, but preferably a curly fiber. The curvature of the curly fiber can be, for example, about 5 to 75 per 2.54 cm, preferably about 10 to 50, and more preferably about 15 to 50. In addition, a uniformly curled curly fiber can be used.

(Superabsorbent polymer particles) A part or all of the absorbent body 56 may contain superabsorbent polymer particles. In addition to "particles", superabsorbent polymer particles also include "powders". As superabsorbent polymer particles, superabsorbent polymer particles used in this absorbent article can be used directly. The particle size of the superabsorbent polymer particles is not particularly limited. For example, when a 500 μm standard sieve (JIS Z8801-1: 2006) is used for screening (5 minutes of vibration), and the particles falling below the sieve are screened (5 minutes of vibration) using a 180 μm standard sieve (JIS Z8801-1: 2006), it is desired that the ratio of particles remaining on the 500 μm standard sieve is less than 30% by weight, and the ratio of particles remaining on the 180 μm standard sieve is more than 60% by weight.

Although the material of the superabsorbent polymer particles is not particularly limited, superabsorbent polymer particles with a water absorption of 30 g/g or more can be used appropriately. As superabsorbent polymer particles, starch-based, cellulose-based, and synthetic polymer-based materials can be used, and starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer saponification products, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer particles, a commonly used powdery or granular body is appropriate, and other shapes are also possible.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less can be appropriately used. If the water absorption rate is too slow, the liquid supplied to the absorbent body 56 is likely to return to the outside of the absorbent body 56 and so-called back-seepage occurs.

Furthermore, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more can be appropriately used. Thereby, even when a fluffy absorbent body 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The mass per unit area of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56. Therefore, although it cannot be generalized, it can be set to 50 to 350 g/ ^m2 . If the mass per unit area of the polymer is lower than this range, it is difficult to ensure the absorption amount. If it is higher than this range, not only will the effect be saturated, but too many superabsorbent polymer particles will cause a sense of incompatibility due to the friction of small particles (producing a rustling sound).

(Wrapping sheet) In order to prevent the superabsorbent polymer particles from falling off or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be wrapped with a wrapping sheet 58 to form an absorbent member 50 and house it. As the wrapping sheet 58, a tissue paper, especially a wrinkled paper, a nonwoven fabric, a laminated nonwoven fabric, a sheet with small holes, etc. can be used. Among them, it is desirable to use a sheet from which the superabsorbent polymer particles will not fall off. When a nonwoven fabric is used instead of wrinkled paper, it is particularly desirable to use a hydrophilic SMMS nonwoven fabric (spunbond/meltblown/meltblown/spunbond), and its material can be polypropylene, polyethylene/polypropylene, etc. The desired mass per unit area is 5 to 40 g/ ^m2 , and it is particularly desirable to be 10 to 30 g/ ^m2 .

As shown in Fig. 3, the wrapping sheet 58 may be formed of a single sheet to wrap the entire absorbent body 56, or may be formed of a plurality of sheets such as two sheets above and below to wrap the entire absorbent body 56. The wrapping sheet 58 may also be omitted.

(Top sheet) The top sheet 30 is liquid-permeable, and can be made of, for example, porous or non-porous nonwoven fabrics, porous plastic sheets, etc. Moreover, the raw material fiber of the nonwoven fabric is not particularly limited. For example, it can be cited: olefins such as polyethylene and polypropylene; synthetic fibers such as polyester and polyamide; regenerated fibers such as rayon and copper ammonium fibers; natural fibers such as cotton; and mixed fibers and composite fibers made by using two or more of these. Furthermore, the nonwoven fabric can be manufactured by any processing. As processing methods, known methods can be cited, such as: hydroentanglement, spunbonding, thermal bonding, meltblowing, needle punching, hot air, and point bonding. For example, if softness and drape are required, the spunlace method is the better processing method; if fluffiness and softness are required, the hot bonding method is the better processing method.

The top sheet 30 extends from the front end to the rear end of the product in the front-to-rear direction and extends further laterally than the absorbent body 56 in the width direction WD. However, if, for example, the starting point of the later-described standing pleats 60 is located closer to the center side in the width direction than the side edge of the absorbent body 56, appropriate changes such as setting the width of the top sheet 30 to be shorter than the full width of the absorbent body 56 may be made as needed.

(Middle sheet) In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent, a middle sheet (also called "second sheet") 40 with a faster liquid permeation speed than the top sheet 30 can be provided. This middle sheet 40 can not only quickly transfer the liquid to the absorbent to improve the absorption performance of the absorbent, but also prevent the absorbed liquid from "seeping back" from the absorbent. The middle sheet 40 can also be omitted.

As the middle sheet 40, for example: the same raw material as the top sheet 30, or spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point-bonded nonwoven fabric, or wrinkled paper. In particular, hot air nonwoven fabric is more fluffy and therefore preferred. Hot air nonwoven fabric preferably uses a composite fiber with a core-sheath structure. In this case, the resin used for the core can be polypropylene (PP), preferably polyester (PET) with high rigidity. The mass per unit area is preferably 17 to 80 g/ ^m2 . The coarseness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric fluffy, it is preferred to use a coreless eccentric fiber, a hollow fiber, or a coreless and hollow fiber as the mixed fiber for all or part of the raw fiber.

The middle sheet 40 of the example shown in the figure is shorter than the width of the absorbent body 56 and is arranged in the center, but it can also be set to cover the entire width. The middle sheet 40 can be set to cover the entire length of the diaper, or it can be set only in the middle part including the excretion position as shown in the example shown in the figure.

(Liquid-impermeable resin film) The liquid-impermeable resin film 11 is not particularly limited as long as it is moisture-permeable. For example, a microporous sheet obtained by kneading an inorganic filler into an olefin resin such as polyethylene and polypropylene, forming it into a sheet, and then extending it in a uniaxial or biaxial direction can be appropriately used. The liquid-impermeable resin film 11 is particularly a resin film that is moisture-permeable in the thickness direction. Of course, the liquid-impermeable resin film 11 does not include a material that uses a non-woven fabric as a base material and improves waterproofness. In the liquid-impermeable resin film 11 composed of a moisture-permeable resin film, in addition to continuous decorative printing, intermittent decorative printing can also be applied. When implementing these decorative printings, it is desired that the liquid-impermeable resin film 11 has a small degree of stretch. The continuous decorative printing is composed of a plurality of constituent units of text (size, brand name, manufacturer name, name of pattern, etc.) or patterns that are regularly repeated in the front-to-back direction LD and the width direction WD. The intermittent decorative printing is a product logo, a picture of a character, a photo, etc. that is only arranged on either or both sides of the front and back of the product.

The liquid-impermeable resin film 11 is expected to extend in the same manner as the absorbent body 56 in the front-to-back direction LD and the width direction WD or over a wider range. When there are other waterproofing means, it can be set to a form that does not cover the ends of the absorbent body 56 in the front-to-back direction LD and the width direction WD as needed.

(Exterior nonwoven fabric) The exterior nonwoven fabric 12 covers the entire outer surface of the liquid-impermeable resin film 11 and makes the exterior of the product look like cloth. The exterior nonwoven fabric 12 is not particularly limited as long as it has moisture permeability; as raw material fibers, for example, in addition to being able to use olefins such as polyethylene or polypropylene, polyesters, polyamides and other synthetic fibers, it is also possible to use regenerated fibers such as rayon and copper ammonium fibers, and natural fibers such as cotton; as processing methods, it is possible to use spunlace, spunbond, thermal bonding, hot air, needle punching, etc. Among them, spunbond nonwovens or long-fiber nonwovens such as SMS nonwovens and SMMS nonwovens are suitable for achieving both skin-friendly feel and strength. In addition to using a single sheet of nonwovens, multiple sheets can also be used in a stacked manner. In the latter case, it is preferred to bond the nonwovens to each other using a hot melt adhesive. When using nonwovens, the fiber mass per unit area is preferably 15 to 25 g/m ² , and particularly preferably 18 to 20 g/m ² .

(Standing pleats) In order to prevent the lateral movement of excrement transferred on the top sheet 30 and prevent so-called side leakage, it is preferable to provide standing pleats 60 which stand up toward the skin side of the wearer on both sides of the width direction WD of the inner surface. Of course, the standing pleats 60 can also be omitted.

When the standing pleats 60 are used, their structure is not particularly limited and various known structures can be used. The standing pleats 60 shown in the figure is composed of a pleated sheet 62 that is substantially continuous in the width direction WD and a thin elongated pleated elastic member 63 fixed to the pleated sheet 62 in a state of being stretched along the front-rear direction LD. A water-repellent non-woven fabric can be used as the pleated sheet 62, and a rubber thread or the like can be used as the pleated elastic member 63. In addition to providing a plurality of elastic members on each side as shown in FIG. 1 and FIG. 2, a single elastic member can also be provided on each side.

The inner surface of this pleated sheet 62 has a joining starting point in the width direction WD on the side of the top sheet 30, and the portion from this joining starting point to the outside in the width direction WD is joined to the inner surface of each side wing portion SF by a hot melt adhesive or the like, that is, the side of the liquid-impermeable resin film 11 in the illustrated example and the side of the outer non-woven fabric 12 located on the outside in the width direction thereof.

In the leg circumference, it is fixed to the top piece 30 at both ends in the front-rear direction of the product, closer to the inner side in the width direction than the joining starting point of the standing pleat 60, and the part in between is a non-fixed free part. This free part stands up by the contraction force of the elastic component 63 and fits tightly to the body surface.

(End wings, side wings) The illustrated disposable diaper has a pair of end wings EF and a pair of side wings SF. The end wings EF extend respectively to the front and rear sides of the absorbent body 56 and do not have the absorbent body 56. The side wings SF extend further to the side than the side edges of the absorbent body 56 and do not have the absorbent body 56.

(Plane pleats) A leg elastic member 64 made of a thin elastic member such as rubber thread is fixed to each side wing SF in a state of being stretched along the front-rear direction LD, thereby forming the leg portion of each side wing SF into a plane pleat. The leg elastic member 64 can be set between the liquid-impermeable resin film 11 and the outer non-woven fabric 12 in the side wing SF, in addition to being set on the outer side of the width direction near the joining starting point in the joining portion of the pleated sheet 62 and between the pleated sheet 62 and the liquid-impermeable resin film 11 as shown in the example shown in the figure. In addition to being set in multiple pieces on each side as shown in the example shown in the figure, only one leg elastic member 64 can be set on each side.

(Connection belt) The side wings SF in the back part B are provided with connection belts 13, which are connected to the outer surface of the abdominal part F in a removable manner. When the diaper is worn, the connection belts 13 are wound around the outer surface of the abdominal part F from both sides of the waist, and the connection part 13A of the connection belt 13 is connected to the appropriate place of the outer surface of the abdominal part F.

The structure of the connecting belt 13 is not particularly limited. In the illustrated example, it has a sheet base material and a connecting portion 13A. The sheet base material is composed of a belt mounting portion 13C fixed to the side wing portion SF, and a belt main body portion 13B protruding from the belt mounting portion 13C. The connecting portion 13A is arranged in the middle portion of the belt main body portion 13B in the width direction of the sheet base material and faces the abdomen. The portion closer to the end side than the locking portion 13A is formed into a gripping portion.

As the connecting portion 13A, in addition to the hook material (convex part) of the mechanical fastener (Hook and Loop), an adhesive layer may also be provided. The hook material has a plurality of engaging protrusions on its connecting surface. As the shape of the engaging protrusion, there are (A) Japanese レ shape, (B) J shape, (C) mushroom shape, (D) T shape, (E) double J shape (a shape formed by connecting J-shaped structures back to back), etc., and any shape is also possible.

Furthermore, as the sheet base material forming the belt attachment portion 13C to the belt body portion 13B, nonwoven fabric, plastic film, laminated nonwoven fabric, paper, or a composite material thereof can be used, preferably a spunbond nonwoven fabric, air-through nonwoven fabric, or spunlace nonwoven fabric having a fineness of 1.0 to 3.5 dtex, a mass per unit area of 60 to 100 g/m ² , and a thickness of 1.0 mm or less.

(Target piece) It is preferable to set a target piece 20 at the stopper of the connecting belt 13 in the ventral part F, and the target piece 20 has a target that makes the connection easier. When the connecting part 13A is a hook, the target piece 20 can use a target piece having a plurality of loops provided on the surface of a sheet substrate made of a plastic film or a non-woven fabric for the hook to be caught by the engaging protrusion; and when the stopper 13A is an adhesive layer, the target piece 20 can use a target piece having an adhesive surface obtained by performing a peeling treatment on the surface of a sheet substrate made of a smooth plastic film. Furthermore, when the attachment portion of the connecting belt 13 in the abdominal portion F is made of nonwoven fabric, for example, in the case of the outer nonwoven fabric 12 as shown in the figure, the target piece 20 can be omitted, and the hook material can be entangled and attached to the fibers of the outer nonwoven fabric 12. In this case, the target piece 20 as a visual mark can also be set between the outer nonwoven fabric 12 and the liquid-impermeable resin film 11.

(Micro-fibrous cellulose) Micro-fibrous cellulose refers to fine cellulose fibers obtained by fibrillating pulp fibers. It generally refers to cellulose fibers containing cellulose fine fibers with an average fiber width of nanometer size (1 nm or more and 1000 nm or less), preferably cellulose fibers with an average fiber width (medium size) of 100 nm or less (generally referred to as cellulose nanofibers (CNF)), and particularly preferably cellulose fibers with a width of 10 to 60 nm. Cellulose fibers are countless β-glucose, mainly linked to a chain by β-1,4 glycosidic bonds. β-Glucose has -H groups, -OH groups, etc.

Micro-fibrous cellulose has the effect of adsorbing and absorbing moisture (water molecules, etc.) and reducing odor. The reason why micro-fibrous cellulose has the effect of absorbing moisture and deodorizing is unknown. However, one of the reasons may be that moisture components and odor components are physically adsorbed and retained on the surface of micro-fibrous cellulose, and their freedom is taken away. In addition, micro-fibrous cellulose has a molecular structure with many -OH groups, so micro-fibrous cellulose has a high affinity with moisture (water molecules, etc.).

The dispersion of micro-fibrous cellulose is a liquid in which micro-fibrous cellulose is dispersed in a solvent. The concentration (mass/volume) of the dispersion of micro-fibrous cellulose is preferably 0.1 to 10%, more preferably 1.0 to 5.0%, and particularly preferably 1.5 to 3.0%. A dispersion exceeding 10% is difficult to manufacture or excessively consumes manufacturing costs. A dispersion below 0.1% has too low a concentration of micro-fibrous cellulose to be useful. The solvent for dispersing micro-fibrous cellulose is not particularly limited, and in addition to water, ethanol and other lower alcohols, volatile organic solvents such as acetone can also be used.

The B-type viscosity (60 rpm (rotation per minute), 20° C.) of the dispersion of micro-fibrous cellulose is, for example, 700 cps or less, preferably 200 cps or less, and more preferably 50 cps or less. In this way, the B-type viscosity of the dispersion of micro-fibrous cellulose is suppressed to a low level, thereby uniformly imparting the aggregates 15 on the surface of the sheet, thereby uniformly improving the surface properties of the sheet.

The method for measuring the average fiber width of micro-fibrous cellulose is described. First, 100 ml of an aqueous dispersion of micro-fibrous cellulose having a solid content of 0.01 to 0.1% is filtered using a membrane filter made of Teflon (registered trademark), and the solvent is replaced once with 100 ml of ethanol and three times with 20 ml of t-butanol. Then, freeze-drying and silicon coating are performed to prepare a sample. For this sample, the SEM image of the electron microscope is observed at any magnification of 5000 times, 10000 times, or 30000 times (30000 times in this embodiment) corresponding to the width of the fiber. Specifically, two diagonal lines are drawn on the observation image, and three straight lines passing through the intersection of the diagonal lines are drawn at random. Thus, a total of 100 fiber rods intersecting with these three straight lines are measured visually. Furthermore, the median diameter (median diameter) is set as the average fiber width. In addition, it is not limited to the median diameter of the measured value, for example, the number average diameter or the maximum frequency diameter (multiple diameter) can also be set as the average fiber width.

Examples of pulp fibers that can be used to produce microfibrous cellulose include broadleaf pulp (LBKP), conifer pulp (NBKP) and other chemical pulps, bleached thermomechanical pulp (BTMP), stone-ground wood pulp (SGP), pressurized stone-ground wood pulp (PGW), refined ground wood pulp (RGP), chemical ground wood pulp (CGP), thermo-ground wood pulp (TGP), ground wood pulp (GP), Mechanical pulps such as thermo-turbine mechanical pulp (TMP), chemical thermo-turbine mechanical pulp (CTMP), and refined mechanical pulp (RMP), waste paper pulp made from brown waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, carton waste paper, premium white waste paper, Kent waste paper, imitation waste paper, bond waste paper, and wood waste paper, and deinked pulp (DIP) obtained by deinking waste paper pulp. As long as the effects of the present invention are not impaired, these pulps may be used alone or in combination. Furthermore, micro-fibrous cellulose obtained by subjecting the above-mentioned pulp fibers to a chemical treatment such as carboxymethylation may also be used.

As a method for producing micro-fibrous cellulose, there are mechanical methods such as high-pressure homogenizer method, microfluidizer method, grinder grinding method, bead mill freeze pulverization method, ultrasonic fiber opening method, etc., but it is not limited to these methods. In addition, TEMPO (tetramethylpiperidinyl N-oxide, 2,2,6,6-Tetramethylpiperidinooxy) oxidation treatment, phosphate esterification treatment, acid treatment, etc. are used to promote microfibrillation.

(Agglomerates) The agglomerates of this type include a moisturizer and at least one of micro-fibrous cellulose and aggregated particles thereof (hereinafter also referred to as "micro-fibrous cellulose, etc." in this specification).

For example, in 100 parts by mass of the aggregate, the total amount of at least one of the fine fibrous cellulose and aggregated particles thereof and the moisturizer contained is 4 to 100 parts by mass, preferably 6 to 24 parts by mass, and more preferably 9 to 13 parts by mass.

Furthermore, the aggregate may contain 0.25 mass parts, preferably 0.4 mass parts, and more preferably 1.0 mass parts of the aforementioned micro-fibrous cellulose and aggregated particles thereof relative to 1 mass part of the moisturizing agent. If it is greater than 1.0 mass part, the hard nature of the micro-fibrous cellulose will make the aggregate hard.

A polyol can be included in the moisturizer. The moisturizer may be composed entirely of polyols or partly of polyols. The polyol may be soluble in water. The polyol can be separated from a solution of water and polyols by a known chemical separation method. In one example, polyols and water have different boiling points and freezing points, so they can be separated by a method based on distillation or a solidification method based on cooling. Furthermore, when the moisturizer is extracted from the coagulant, it can be extracted by a known extraction method based on an organic solvent. The extracted substance is separated and concentrated by a known method, and the various components contained in the moisturizer can be measured qualitatively and quantitatively.

As a substance other than polyol that can be included in a moisturizer, for example, ethanol can be cited. Ethanol has a certain degree of volatility and can suppress excessive viscosity of the moisturizer. In addition, a moisturizer containing ethanol is preferred because its quick-drying property is relaxed and it has high moisturizing properties.

When ethanol is included in the moisturizing agent, the volume ratio of ethanol to polyol may be, for example, 1:1.5 to 1:4.

As the polyol, known polyols can be used appropriately. For example, glycerin, diglycerin, ethylene glycol, polyethylene glycol, propylene glycol, 1,3-butylene glycol, hexylene glycol, mannitol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,2-pentanediol, 1,3-propanediol, sorbitol, and polyethylene glycol. In particular, diglycerin, polyethylene glycol, dipropylene glycol, and 1,3-butylene glycol are preferred because they have high moisturizing power and transparency. Furthermore, if diglycerin, polyethylene glycol, dipropylene glycol, and 1,3-butylene glycol, which have high transparency, are used as the aggregate as the main component, it is difficult to distinguish between the coated part of the aggregate and the uncoated part. Therefore, for example, there is an advantage that even if the aggregate is set on a liquid-impermeable resin film that has been designed, the visibility will not be impaired. These polyols may be used alone or in combination of two or more. However, the polyols are not limited to those listed above.

In addition, as a substance that can be contained in the aggregate other than the micro-fibrous cellulose and the moisturizer, a nonionic surfactant can be exemplified. The nonionic surfactant shown below is preferred because it has transparency and has the effect of dispersing the micro-fibrous cellulose and suppressing stickiness. Examples of nonionic surfactants include polyoxyethylene hydrogenated castor oil represented by hydrogenated castor oil of PEG-40 to PEG-60, PEG-20 sorbitan isostearate, sorbitan fatty acid esters, glycerol fatty acid esters, polyglycerol fatty acid esters, propylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene glycerol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene phytosterols, polyoxyethylene castor oil, polyoxyethylene alkylamines, polyoxyethylene fatty acid amides, and alkyl glycosides. These nonionic surfactants may be used alone or in combination of two or more.

If 0.01 to 4% by mass of a nonionic surfactant is contained in 100% by mass of an aggregate, the aggregate will have a transparent feel and can suppress a sticky feeling, so it is preferable. Hydrogenated castor oils of PEG-40 to PEG-60 are in a paste-like form, so they can be particularly suitably contained in the aggregate. At this time, any one of the hydrogenated castor oils of PEG-40 to PEG-60 can be mixed with other nonionic surfactants in a mass ratio of 1:1 to 1:5.

Furthermore, the following substances can also be included in the moisturizer. Specifically, examples include vaseline, axle oil, castor oil, olive oil, refined mineral oil, liquid wax, polybutene, α-olefin, oligomer or oligopolymer of α-olefin, dimethyl silicone oil, methylphenyl silicone oil, amino-modified silicone oil, polyether-modified silicone oil, fatty acid-modified silicone oil, etc. (hereinafter also referred to as "vaseline and other substances"), and one or more of them can be used in combination.

The moisturizer may be thickened to an appropriate viscosity by adding a thickener. Examples of the thickener include silica with a hydrophobic surface treatment, micro-silica with a methylated surface treatment, aluminum silicate, expanded mica, clay-based thickeners such as bentonite or montmorillonite with a hydrophobic surface treatment, fatty acid metal soaps such as magnesium stearate, calcium stearate, aluminum stearate, and zinc stearate, tribenzylidene sorbitol, fatty acid amide, amide-modified polyethylene wax, hydrogenated castor oil, dextrin-based compounds such as fatty acid dextrin, and cellulose-based compounds.

The moisturizer may also contain water. Examples of moisturizers include gel, colloid, paste, slurry, block, cream, and latex that are not volatile, but are not limited to these forms. The moisturizer may be sticky or non-sticky. Furthermore, the moisturizer may be deformed when an external force is applied, or may be deformed even when no external force is applied. Preferably, it is not easily deformed when no pressure is applied. An absorbent article having a functional sheet, wherein the functional sheet has agglomerates such as micro-fibrous cellulose attached thereto, and the agglomerates contain the moisturizer that is not easily deformed. For example, even when placed vertically or horizontally for a long time, the agglomerates remain at the position where they were originally attached, so it is a particularly good form. Of course, even in the case of a moisturizing agent that is not easily deformed, micro-fibrous cellulose has the effect of anchoring the moisturizing agent and the sheet (anchoring effect), so if a moisturizing agent that is not easily deformed is attached to the functional sheet, the absorbent article having the functional sheet will remain at the position where it was originally attached even if it is placed in any way, so it is a better form.

The following is an example of a mixed form of the fine fibrous cellulose 101 and the fine fibrous cellulose aggregate particles 102 in the aggregate and other components (for example, moisturizer 103). However, the present invention is not limited to the following form.

Referring to FIG. 15 and explaining the bonding morphology, it is possible to exemplify a morphology in which the first micro-fibrous cellulose 101 or its aggregated particle 102 and the second micro-fibrous cellulose 101 or its aggregated particle 102 are connected via other components (e.g., moisturizing agent 103). Other components (e.g., moisturizing agent 103) may be attached to a part of the micro-fibrous cellulose 101 or its aggregated particle 102, or may be attached to the entire micro-fibrous cellulose 101 or its aggregated particle 102. In addition, it is also possible to have other components (e.g., moisturizing agent 103) attached to the entire surface of the micro-fibrous cellulose 101 or the entire surface of its aggregated particle 102. In addition, the micro-fibrous cellulose 101 indicated by the dotted line in FIG. 15( b ) indicates that other components (eg, moisturizing agent 103 ) are attached to the entire surface of the micro-fibrous cellulose 101 .

(Functional sheet) Functional sheets can be used on sheets of various parts constituting absorbent articles. For example, the functional sheet is used on at least one of the liquid-permeable top sheet 30, the middle sheet 40, the liquid-impermeable resin film 11, and the outer nonwoven fabric 12.

The amount of the cellulose-containing aggregate applied to the nonwoven fabric (the amount applied per unit area) may be different depending on the purpose of the nonwoven fabric, or may be the same regardless of the purpose of the nonwoven fabric. For example, when the nonwoven fabric is used as the outer surface of the top sheet 30 or the outer nonwoven fabric 12, the amount of adhesion may be set to 13 g/ ^m2 or less, preferably 10 g/ ^m2 or less. Alternatively, the amount of adhesion may be set to 2 g/ ^m2 or more. If the amount of adhesion is set to 13 g/ ^m2 or less, the adhesion portion will not have a sticky impression, so that the touch becomes good. As long as the same aggregate is attached to the nonwoven fabric, there is no rigid requirement to set a lower limit for the amount of attachment. For example, if it is set to 2 g/m ² or more, the moisture absorption effect of the micro-fibrous cellulose becomes particularly good.

When the same condensate is applied to the inner surface of the outer non-woven fabric 12, the application amount (adhesion amount) can be set to more than 13 g/m ^2. The inner surface of the outer non-woven fabric 12 is located inside the product, and the skin does not touch the inner surface of the outer non-woven fabric 12, so it is not easy to feel sticky.

Furthermore, the same coagulant can be applied to the inner surface or the outer surface of the top sheet 30. In particular, in a product in which the inner surface of the top sheet 30 is coated (attached) with the same coagulant, the coated surface of the coagulant, that is, the inner surface of the top sheet 30, will contact the skin. Even in this case, as long as the amount of the same coagulant applied (the amount of attachment) is set to less than 13 g/ ^m2 , the coated portion will not easily feel sticky. Furthermore, even in a product in which the outer surface of the top sheet 30 is coated with the same coagulant, the amount of the same coagulant applied can be set to less than 13 g/ ^m2 . It is preferable that the excrement discharged onto the top sheet 30 quickly passes through and is absorbed into the absorbent 56. If the coagulant is applied on the outer surface of the top sheet 30 in an amount exceeding 13 g/ ^m2 , the coagulant may prevent the excretion fluid from penetrating quickly.

In particular, in a product in which the same agglutinate is applied on the inner surface of the top sheet 30, the surface on which the agglutinate is applied, that is, the inner surface of the top sheet 30, contacts the skin. Even in this case, as long as the amount of the same agglutinate applied (the amount of adhesion) is set to 13 g/m ² or less, the applied portion is not likely to feel sticky. In addition, in a product in which the same agglutinate is applied on the outer surface of the top sheet 30, the amount of the same agglutinate applied (the amount of adhesion) can also be set to 13 g/m ² or less. It is preferred that the excretion fluid excreted on the top sheet 30 quickly penetrates and is absorbed into the absorbent 56. If more than 13 g/m ² of coagulant is applied to the outer surface of the top sheet 30, the coagulant may prevent the rapid penetration of excreta.

Furthermore, the same coagulant can be applied to the inner surface or outer surface of the middle sheet 40. The middle sheet 40 is a sheet material that allows the liquid that has passed through the top sheet 30 to be quickly transferred to the absorbent and improves the absorption performance of the absorbent. Glycerin is easily soluble in water. If the coagulant is applied on the middle sheet 40, the liquid can dissolve into the coagulant due to the solubility of the glycerin, and promote the diffusion of the liquid in the front-to-back direction and/or the width direction of the middle sheet 40. As a result, the transfer of the liquid to the absorbent becomes smoother, and the back-seepage of the liquid is suppressed. The amount of coagulant applied to the inner surface or outer surface of the middle sheet 40 can be set to, for example, less than 13 g/ ^m2 . If it exceeds 13 g/ ^m2 , the bonding strength with other functional sheets may be weakened.

(Joining) The components in the cross-sectional views of Fig. 3 to Fig. 7 are joined by an adhesive as a joining means. For example, the liquid-permeable top sheet 30 and the middle sheet 40 are joined on their respective sides, the liquid-permeable top sheet 30 or the middle sheet 40 and the absorbent body 56 are joined on their respective sides, the absorbent body 56 and the liquid-impermeable resin film 11 are joined on their respective sides, and the liquid-impermeable resin film 11 and the outer nonwoven fabric 12 are joined on their respective sides. However, the joining portion is not limited to these respective sides listed.

When the components are joined together, if a coagulant is applied on one of the opposing surfaces, the joining by the adhesive will be weakened in the portion where the coagulant is applied. In this case, the joining can be achieved by reducing the amount of coagulant applied. However, even if the amount of coagulant applied is not reduced, the joining of the components can be achieved by increasing the amount of adhesive applied. Regarding the application of the coagulant on the sheet, it can be applied on both the inner and outer surfaces of the sheet, or it can be applied only on the inner or outer surface.

As shown in FIG. 14, for the coating pattern of the coagulant, the coagulant 15 is arranged on both or one side of the sheet 111 in such a manner that the linear portion continuous in the front-to-back direction becomes a stripe-shaped portion arranged at intervals in the width direction, and the adhesive 81 in the front-to-back direction is arranged in the intervals between the coagulants. That is, it is possible to list the form in which the adhesive 81 is arranged in a stripe-shaped portion. Furthermore, it is also possible to cover one side of the sheet 111 with another sheet and join the sheets together. In this way, in the joint between the sheets, there is no coagulant 15 interposed, so that the sheets can be firmly bonded by the adhesive 81, so that the bonding strength between the constituent components will not be weakened.

As another coating pattern, as shown in FIG. 16 , it is possible to exemplify a state in which the coagulate 15 is arranged in a grid pattern on the sheet 111. Furthermore, the adhesive 81 is arranged in a manner such that the linear portion continuous in the front-rear direction becomes a stripe-shaped portion arranged at intervals in the width direction. The adhesive 81 can be arranged in a manner such that it passes through the grid holes where the coagulate is not arranged (not blocked by the coagulate), but is not limited to this. Moreover, although not shown in the figure, the adhesive 81 can also be arranged only in the grid holes.

In the above-mentioned joining example, the condensate 15 is arranged in a linear shape continuous in the front-back direction on one surface of the sheet 111, but the present invention is not limited to this aspect, and the condensate 15 can also be arranged in a manner that the linear portion continuous in the width direction becomes a stripe-shaped portion arranged at intervals in the front-back direction. In addition, the condensate 15 can also be arranged in a manner that the distribution direction is set to be continuous in the oblique direction on the paper surface.

Alternatively, the agglomerates 15 may be arranged in dots at a plurality of intervals on one surface of the sheet 111 as shown in FIG8 . Although not particularly limited, in one example, it is appropriate to set the size of each dot to 1.0 to 4.0 mm and the interval between the dots to 5 to 30 mm. The arrangement of the dots of the agglomerates 15 is not particularly limited, and in one example, it is possible to show an arrangement in a rhombus grid (FIG. 8(a), FIG. 8(b), FIG. 8(e)), or an arrangement in a grid (FIG. 8(c), FIG. 8(d)). In this case, an adhesive 81 may be appropriately provided in the portion where the dots are not arranged.

When the condensate is applied to the sheet, it may be applied only on one side of the sheet or on both sides of the sheet. In addition, the condensate may be applied to the entire surface of the sheet without leaving any blank space, or the condensate may be applied to a part of the surface of the sheet. For example, the condensate may be applied to at least the portion of the sheet surface that overlaps with the absorbent body 56. The absorbent body 56 is where the excrement is absorbed, considering that the humidity is high after excretion. If micro-fibrous cellulose or the like is provided on the portion of the sheet surface that overlaps with the absorbent body 56, the humidity emitted from the absorbent body 56 will be effectively absorbed by the micro-fibrous cellulose or the like, and the dryness of the sheet will be maintained.

(Wrinkles) Previously, a portion of the sheet surface coated with a micro-fibrous cellulose dispersion was coated. If the dispersion dried, wrinkles in a concave and convex shape would be formed on the sheet along the coated portion (see Figure 12). Figure 12 shows a region 80 coated with a micro-fibrous cellulose dispersion, which does not contain a moisturizer. In region 80, the whiter portion 31 forms wrinkles that are convex in front of the longitudinal depth direction when viewed from above. In addition, the darker portion 32 forms wrinkles that are convex in the depth direction of the longitudinal depth when viewed from above (concave in front), and the entire region 80 forms wrinkles in a concave and convex shape. The feel of the sheet is the hardening of the attached paste after drying, which is the so-called hard touch.

On the other hand, the portion of the sheet surface coated with the coagulant remains moist even after several weeks, and does not form wrinkles like the uneven surface shown in FIG. 12 (see FIG. 13). FIG. 13 shows a region 90 coated with the coagulant, and the ratio of the micro-fibrous cellulose in the coagulant to the moisturizer is 3:10. There are almost no uneven surfaces in the region 90. The feel of the sheet is almost non-sticky, and a smooth impression is given.

(Manufacturing) The manufacturing method of the functional sheet and the absorbent article is not particularly limited, and as an example, it can be carried out by the following steps. (1) A step of mixing a micro-fibrous cellulose dispersion with a moisturizing agent to obtain an aggregate. (2) A step of applying the above-mentioned aggregate on a sheet to obtain a functional sheet. (3) The step of setting the functional sheet as at least one of the liquid-permeable top sheet, liquid-impermeable resin film and outer nonwoven fabric in the absorbent article; Wherein, the absorbent article has: the liquid-permeable top sheet, which covers the inner surface of the absorbent body; the moisture-permeable liquid-impermeable resin film, which covers the outer surface of the absorbent body; and the moisture-permeable outer nonwoven fabric, which covers the outer surface of the liquid-impermeable resin film. The absorbent article can be manufactured through the above steps.

Specifically, for the manufacture of the functional sheet, first, a micro-fibrous cellulose dispersion is mixed with other ingredients (for example, a moisturizer) to form a mixed solution. The mixing ratio can also be set as described above. The concentration of micro-fibrous cellulose contained in the micro-fibrous cellulose dispersion can also be set to, for example, 2 to 3%. It is preferred to stir and mix using a stirring device such as a magnetic stirrer or a glass rod so that the mixed solution becomes a uniform concentration. Non-ionic surfactants, vaseline and other substances, thickeners can be appropriately mixed in this mixed solution. The agglomerate obtained by stirring and mixing is applied to one or both sides of the target sheet. Thereafter, after 3 hours of drying, the water in the agglomerate is evaporated to obtain a functional sheet. Drying methods include air drying, using a dryer or blowing hot air.

(Application of functional sheets to absorbent articles) At least one of a liquid-permeable top sheet, a liquid-impermeable resin film, and an outer nonwoven fabric is used as a functional sheet, and an absorbent article is manufactured by a known method. For example, when a functional sheet coated with an aggregate on one side is used as an outer nonwoven fabric, when the coated surface is set as the outer surface of the absorbent article, the surface of the outer nonwoven fabric that is not the coated surface can also be joined to a component (e.g., a liquid-impermeable resin film) provided on the inner side of the absorbent article. In this way, the coated surface of the outer nonwoven fabric becomes the outer surface of the product.

(Example) (Preparation of samples) (1) Coagulation is uniformly applied in a square of 10 cm on the surface of a nonwoven fabric in such a manner that the application amount after air drying becomes 4 g/m ^2. Here, air drying means drying in a laboratory at 23±1°C and normal pressure for 3 hours. The raw material of this nonwoven fabric is polypropylene fiber (PP), which has been spunbonded and has a mass per unit area of 15 g/m ^2. The mixing ratio of the amount (g) of micro-fibrous cellulose (CNF) in an absolute dry state to the amount (g) of glycerol is changed in various ways as shown in Table 1 to prepare coagulation (Examples 1 to 5 shown in Table 1). As a comparative example, an aggregate consisting only of glycerol is taken as comparative example 1, and an aggregate consisting only of micro-fibrous cellulose is taken as comparative example 2. In addition, the absolutely dry state refers to a state in which the nonwoven fabric is dried at 105°C for 1 hour and then cooled to room temperature in a dryer. (2) The coated nonwoven fabric is air-dried at 23±1°C and normal pressure for 3 hours to prepare a sample (an example or a comparative example). In addition, the inventors have found that the coated nonwoven fabric does not reduce its mass below the necessary mass and becomes almost constant when it is air-dried at 23±1°C and normal pressure for more than 3 hours or dried in a dryer. (3) The softness, elimination of stickiness, transfer amount, and moisture absorption of the obtained samples were measured.

(Softness) Hold the two ends of the sample with both hands, bend the sample several times, twist it several times, and evaluate the softness. The evaluation method is as follows. "◎": No hard feeling, and a soft impression is felt. "○": Almost no hard feeling, and a slightly soft impression is felt. "△": There is a slightly hard feeling, and part of the coating has cracks, but it has not split. "×": There is a strong hard feeling, and part of the coating has cracks, and it has split.

(Elimination of stickiness) The applied area was touched with the skin, and the elimination of the stickiness of the applied area was evaluated. "◎": There was no stickiness at all on the applied area, and the impression of stickiness was not felt at all. "○": There was almost no stickiness at the applied area, and the impression of stickiness was almost not felt. "△": There was a slight stickiness at the applied area, and the impression of stickiness was slightly felt. "×": There was a strong stickiness at the applied area, and the impression of stickiness was strongly felt.

(Transfer amount) Place the coating part on a flat plate, cover the entire coating part with a filter paper of known mass, place a 1kg weight on the filter paper, and leave it for one minute. After that, remove the weight and the flat plate, and measure the mass of the filter paper. Then, calculate the transfer amount using the following formula. Transfer amount (g) = mass of filter paper (mass after transfer (g)) - mass of filter paper (mass before transfer (g))

(Moisture absorption) Put the sample coated with condensate in a constant temperature and humidity chamber adjusted to 40℃ and 90% humidity. After leaving it for 1 hour, measure the mass of the sample. Then, calculate the moisture absorption using the following formula. Moisture absorption (g) = mass of the sample after being placed in the constant temperature and humidity chamber for 1 hour (mass after moisture absorption (g)) - mass of the sample before being placed in the constant temperature and humidity chamber (mass before moisture absorption (g))

[Table 1]

The invention implemented by the inventor is described above as an embodiment. However, the description or drawings shown in this embodiment should not limit the present invention. The present invention also includes other embodiments implemented by the industry based on this embodiment.

<Explanation of terms used in this manual> When the following terms are used in this manual, they have the following meanings unless otherwise specified in this manual. ・"Anterior-posterior (longitudinal) direction" refers to the direction connecting the ventral side (front side) and the dorsal side (back side), and "width direction" refers to the direction perpendicular to the posterior-posterior direction (left-right direction).

・“Inner side” refers to the side closer to the wearer’s skin; “outer side” refers to the side farther from the wearer’s skin. “Inner surface” refers to the side of the component closer to the wearer’s skin; “outer surface” refers to the side of the component farther from the wearer’s skin.

・"LD direction" and "WD direction" refer to the flow direction (LD direction) in the manufacturing equipment and the transverse direction (WD direction) orthogonal thereto, with one of them being the front-to-back direction of the product and the other being the width direction of the product. The LD direction of nonwoven fabrics is the direction in which the fibers of the nonwoven fabrics are oriented. Fiber orientation refers to the direction in which the fibers of nonwoven fabrics extend, and fiber orientation can be determined by, for example, a fiber orientation test method based on zero-distance tensile strength according to TAPPI (Technical Association of the Pulp and Paper Industry) standard method T481, and a simple measurement method that determines the direction of fiber orientation based on the ratio of tensile strength in the front-to-back direction and the width direction.

・The "expanded state" refers to a state in which the body is flatly expanded without contraction or relaxation.

・"Gel strength" is measured in the following manner. 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine (mixed by 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate and 97.09 wt% ion exchange water) and stirred with a stirrer. The generated gel is placed in a constant temperature and humidity chamber at 40°C × 60% RH (relative humidity) for 3 hours and then returned to room temperature. The gel strength is measured using a curdmeter (manufactured by I. technoEngineering: Curdmeter-MAX ME-500).

・The "mass per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a standard test room or device (the temperature of the test site is 23±1℃ and the relative humidity is 50±2%) to make it a constant state. Pre-drying means that the sample or test piece is kept constant in an environment with a temperature of 100℃. In addition, for fibers with a standard moisture regain of 0.0%, pre-drying is not required. Using a template for sample selection (100mm×100mm), cut a sample of 100mm×100mm from the test piece that has become a constant state. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter as the mass per unit area.

・The thickness is measured automatically using an automatic thickness tester (KES-G5 portable compression tester) at a load of 0.098N/ ^cm2 and a compression area of ^2cm2 .

・“Water absorption” is measured according to JIS K7223-1996 “Test method for water absorption of highly water-absorbent resins”.

・The "water absorption rate" is the "time until the end point" when using 2g of super absorbent polymer and 50g of physiological saline in accordance with JIS K7224-1996 "Test method for water absorption rate of super absorbent resins".

・The amount of aggregate applied is the value after air drying and its unit is g/m ² .

・In the absence of any description of the environmental conditions during the test or measurement, the test or measurement is carried out in a test room or device under standard conditions (test site at a temperature of 23±1℃ and a relative humidity of 50±2%).

・The dimensions of each part are in the unfolded state, not the natural length, unless otherwise specified.

[Industrial Applicability] The present invention can be used in all disposable diapers, such as pants-type disposable diapers, in addition to the above-mentioned disposable diapers, and of course, in all absorbent articles, such as sanitary napkins.

11: Liquid-impermeable resin film 12: Outer nonwoven fabric 13: Connecting belt 13A: Connecting part 13B: Belt body 13C: Belt mounting part 15: Agglutination 20: Target sheet 30: Top sheet 31: Whiter part 32: Darker part 40: Middle sheet 50: Absorbent member 56: Absorber 56W: Width of absorber 58: Packing sheet 60: Rising pleats 62: Pleated sheet 63: Pleated elastic member (elastic member) 64: Leg elastic member 8 0: Area coated with micro-fibrous cellulose dispersion 81: Adhesive 90: Area coated with aggregates 101: Micro-fibrous cellulose 102: Micro-fibrous cellulose aggregate particles 103: Moisturizer 111: Sheet B: Dorsal part F: Ventral part SF: Side wing part EF: End wing part WD: Width direction LD: Front-back direction L: Full length of diaper X: Full width of diaper excluding connecting tape 5-5, 6-6, 7-7, 8-8, 9-9: Section line

FIG. 1 is a plan view showing the unfolded state of the inner surface of the adhesive type disposable diaper. FIG. 2 is a plan view showing the unfolded state of the outer surface of the adhesive type disposable diaper. FIG. 3 is a cross-sectional view along line 6-6 in FIG. 1. FIG. 4 is a cross-sectional view along line 7-7 in FIG. 1. FIG. 5 is a cross-sectional view along line 8-8 in FIG. 1. FIG. 6 is a cross-sectional view along line 9-9 in FIG. 1. FIG. 7 is a cross-sectional view along line 5-5 in FIG. 1. FIG. 8 is an explanatory view showing the configuration of micro-fibrous cellulose aggregate particles. FIG. 9 is an explanatory view showing other coating examples of micro-fibrous cellulose. FIG. 10 is an explanatory view showing other coating forms of micro-fibrous cellulose. FIG. 11 is an explanatory diagram showing other coating forms of micro-fibrous cellulose. FIG. 12 is a diagram showing a nonwoven fabric coated with only micro-fibrous cellulose. FIG. 13 is a diagram showing a nonwoven fabric coated with a coagulant. FIG. 14 is an explanatory diagram showing one form of a coating pattern of a coagulant and an adhesive. FIG. 15 is a schematic diagram of a coagulant. FIG. 16 is an explanatory diagram showing other forms of a coating pattern of a coagulant and an adhesive.

Domestic storage information (please note the storage institution, date, and number in order) None

Overseas storage information (please note the storage country, institution, date, and number in order) None

90: Areas coated with agglomerates

Claims (7)

An absorbent article, characterized in that it comprises: a liquid-permeable top sheet covering the inner surface of an absorbent body; a moisture-permeable liquid-impermeable resin film covering the outer surface of the absorbent body; and a moisture-permeable outer nonwoven fabric covering the outer surface of the liquid-impermeable resin film; the liquid-permeable top sheet is a functional sheet, and the functional sheet is formed by attaching agglomerates of at least one of micro-fibrous cellulose and aggregated particles thereof containing a moisturizing agent to a sheet material. An absorbent article, characterized in that it has: a liquid-permeable top sheet covering the inner surface of an absorbent body; a moisture-permeable liquid-impermeable resin film covering the outer surface of the absorbent body; and a moisture-permeable outer nonwoven fabric covering the outer surface of the liquid-impermeable resin film; the outer nonwoven fabric is a functional sheet, and the functional sheet is formed by attaching at least one of the aggregates of micro-fibrous cellulose and aggregated particles thereof containing a moisturizing agent to a sheet material, and the aggregates are provided on one surface of the functional sheet, and the one surface is the outer surface of the outer nonwoven fabric. The absorbent article as described in claim 1 or 2, wherein the aforementioned agglomerate comprises: relative to 1 mass part of the aforementioned moisturizing agent, a total of 0.25 to 1.0 mass parts of the aforementioned micro-fibrous cellulose and its aggregated particles. The absorbent article as claimed in claim 1 or 2, wherein the agglomerate is set to be 13.0 g/ ^m2 or less. An absorbent article as described in claim 1 or 2, wherein the aforementioned aggregate disposed on the aforementioned functional sheet has a linear portion continuous in the front-to-back direction and a stripe-like portion arranged at intervals in the width direction. A method for manufacturing an absorbent article, characterized in that it comprises: a step of mixing a micro-fibrous cellulose dispersion and a moisturizing agent to obtain an aggregate; a step of applying the aggregate on a sheet to obtain a functional sheet; and a step of setting the functional sheet as a liquid-permeable top sheet in the absorbent article; wherein the absorbent article comprises: the liquid-permeable top sheet covering the inner surface of the absorbent body; a liquid-impermeable resin film having moisture permeability covering the outer surface of the absorbent body; and a moisture-permeable outer nonwoven fabric covering the outer surface of the liquid-impermeable resin film. A method for manufacturing an absorbent article, characterized in that it comprises: a step of mixing a micro-fibrous cellulose dispersion and a moisturizing agent to obtain an aggregate; a step of applying the aggregate on a sheet to obtain a functional sheet; and a step of setting the functional sheet as an outer nonwoven fabric in the absorbent article; wherein the absorbent article comprises: a liquid-permeable top sheet covering the inner surface of the absorbent body; a moisture-permeable liquid-impermeable resin film covering the outer surface of the absorbent body; and the moisture-permeable outer nonwoven fabric covering the outer surface of the liquid-impermeable resin film; the aggregate is set on one side of the functional sheet, and the one side is the outer surface of the outer nonwoven fabric.