WO2015046589A1 - Absorbent article - Google Patents

Abstract

The objective of the present invention is to achieve an absorbent article which is capable of effectively utilizing the whole of an absorbent to improve the absorption capacity for discharged liquid while securing the capacity to repeatedly diffuse the discharged liquid in a liquid diffusion sheet. That is, a liquid-permeable sheet (11) has, on a face of the liquid-permeable sheet (11) opposite an absorbent (4), multiple protrusions (11a) that rise in a direction opposite the absorbent (4) and multiple depressions (11b) provided between adjacent protrusions (11a, 11a). In addition, a liquid diffusion sheet (13) that extends in a longitudinal direction of the absorbent (4) is disposed between the absorbent (4) and a non-liquid-permeable sheet (12), and the liquid diffusion sheet (13) is provided with an evaporation portion (20, 21) on at least one longitudinal end of the liquid diffusion sheet (13), the evaporation portion (20, 21) extending outward of the absorbent (4) from a longitudinal end of the absorbent (4) and allowing water contained in the liquid diffusion sheet (13) to evaporate to the outside.

Description

Absorbent articles

The present invention relates to absorbent articles such as disposable diapers, sanitary napkins and incontinence pads, and more particularly to absorbent articles excellent in breathability.

As an absorbent article, for example, a disposable diaper for absorbing excrement fluid such as urine is a liquid-permeable sheet (so-called top sheet) located on the skin side of the wearer, and a liquid-impermeable sheet (so-called In general, a back sheet) and an absorber provided between the liquid-permeable sheet and the liquid-impermeable sheet are provided.
When such a diaper is actually worn, the absorbent body in the disposable diaper is curved in a substantially U shape along the wearer's body, usually extending from the ventral side to the crotch portion and the dorsal side. is there.

At this time, the crotch portion of the diaper, which is a portion mainly receiving the excretory fluid, is at the lowest position, while the ventral side and the back side are at a higher position than the crotch portion. Therefore, when no measures are taken, when the excrement fluid is discharged to the diaper, most of the excrement fluid is absorbed and held by the crotch, while the excrement fluid diffuses to the ventral side and the dorsal side. There is almost no
Therefore, among the absorbers, only the crotch is actually used, and the other ventral side and back side are not usefully used, and the desired absorption and retention amount for the excretory fluid is obtained. It is the fact that there is not.

In order to solve this problem, for example, as described in Patent Document 1, the excretory fluid that can not be absorbed by the liquid permeable sheet side of the absorbent is disposed on the liquid impermeable sheet side of the absorbent. Is known to absorb by the liquid diffusion sheet and diffuse the liquid absorbed by the liquid diffusion sheet to the liquid impermeable sheet side of the absorber so that the absorbent can absorb and retain the liquid from the liquid impermeable sheet side. It is done.
The technique described in the patent document 1 utilizes the liquid-impervious sheet side of the absorber which is difficult to use, and diffuses the excrement fluid to the ventral side and the back side of the absorber to make the excretory fluid of the absorber It is intended to increase the absorption area and to increase the rate and amount of absorption of waste fluid.

Generally, in the diaper provided with the liquid diffusion sheet, the diffusion of the excretory fluid by the liquid diffusion sheet is performed in the following manner.
That is, since the excretory fluid from the wearer is mainly supplied to the crotch portion of the absorber, it moves from the liquid diffusion sheet side of the absorber of the crotch portion toward the liquid impermeable sheet side. Then, the excretory fluid that has not been absorbed and held by the absorbent during movement reaches the liquid impermeable sheet side, and the excretory fluid that has reached the liquid impermeable sheet side is absorbed by the liquid diffusion sheet. , Move in multiple directions in the liquid diffusion sheet.
At this time, since the liquid diffusion sheet extends along the longitudinal direction of the absorber, that is, the direction from the ventral side to the back side of the absorber, the waste liquid absorbed by the liquid diffusion sheet is mainly an absorbent. Move to the ventral and dorsal sides of the And the excretory fluid which moved to the ventral side and the back side of the absorber in a liquid diffusion sheet will move to the liquid impervious sheet side of an absorber, and will be absorbed and held.
As a result, the waste fluid can be diffused to the ventral side and the dorsal side of the absorber, and the entire absorber can be used for absorption of the waste fluid.

By the way, the liquid diffusion sheet absorbs waste liquid from the wearer once from the liquid impermeable sheet side of the crotch of the absorbent body, and then diffuses it to the ventral side or back side of the absorbent body to absorb the liquid again. By moving it to the ventral side or dorsal side of the body, it is possible to restore the ability to absorb and diffuse waste fluid again.
Thereby, even if the wearer excretes a plurality of times, it is possible to diffuse the excretory fluid to the ventral side or the dorsal side of the absorber as long as the absorption and diffusion ability of the liquid diffusion sheet is recovered.

Here, when the liquid diffusion sheet continues to diffuse the excrement fluid toward the ventral side or the back side of the absorber, the amount of the excretory fluid moving from the liquid diffusion sheet to the absorber decreases, so the liquid diffusion sheet The excreted fluid held by is not easily absorbed by the absorber, and the recovery of absorption and diffusion capacity of the liquid diffusion sheet tends to be delayed. However, in this case, the part used for absorption and retention of the excrement fluid in the absorber is only the part in contact with the liquid-permeable sheet on the ventral side or the back side of the absorber or the vicinity thereof However, in fact, the more internal part of the absorber is likely to be less used for absorption and retention of waste fluid. Therefore, as the whole absorbent body, there are many cases where the ability to absorb and hold excretory fluid still has excess capacity.
Therefore, in order to effectively use the entire absorber for absorption and retention of waste fluid, the absorption and diffusion ability of the liquid-permeable sheet is restored as early as possible, and waste fluid is discharged to the ventral side and the dorsal side of the absorber. It is preferable to be able to maintain the state of being able to sequentially diffuse and absorb.

However, since the diaper is in close contact with the skin around the wearer's belly, thigh and crotch (footsteps), usually when the excretory fluid is discharged from the wearer, the wearer and the diaper The internal space between (especially between the wearer and the liquid-impervious sheet) becomes significantly humid and humidified.
In this case, the liquid-permeable sheet hardly recovers its absorption / diffusion ability unless the absorbent absorbs the excretory fluid held by the liquid-permeable sheet, and conversely, the moisture is absorbed. It may inhibit the recovery of absorption and diffusion capacity.
Therefore, only a part of the absorber is used for absorption and retention of the excrement fluid, whereby a desired absorption and retention amount can not be obtained, and excrement fluid that can not be absorbed may leak from the diaper. possible.

Also in the diaper described in Patent Document 1, since the liquid diffusion sheet is contained in the internal space between the wearer and the liquid impermeable sheet, it is greatly affected by the environment in the internal space when worn. It will be.
Therefore, problems occur that the absorption and diffusion ability of the liquid diffusion sheet is difficult to recover or the recovery speed is slowed, and it may be difficult to recover the absorption and diffusion functions of the liquid diffusion sheet at an early stage. is there. Thereby, it is possible that the excretory fluid leaks out without being able to effectively utilize the whole absorber.

JP, 2008-284167, A

The technical problem of the present invention is to provide an absorbent article capable of ensuring the ability of the liquid diffusion sheet to repeatedly diffuse waste fluid and effectively utilizing the whole absorbent body to improve the ability to absorb waste fluid. It is.

In order to solve the above problems, the absorbent article of the present invention comprises a liquid-permeable sheet, a liquid-impermeable sheet disposed on one side of the liquid-permeable sheet, and a liquid-impermeable sheet having no liquid An absorbent article provided with a unidirectionally long absorbent body disposed between the permeable sheet and the absorbent sheet, wherein the absorbent body is provided on the side opposite to the absorbent body in the liquid-permeable sheet. Has a plurality of raised portions rising in opposite directions, and a plurality of recessed portions provided between adjacent raised portions, and the absorption is performed between the absorber and the liquid impermeable sheet A liquid diffusion sheet extending in the longitudinal direction of the body is disposed, and the liquid diffusion sheet is attached to at least one end side in the longitudinal direction of the liquid diffusion sheet from an end portion in the longitudinal direction of the absorber outside the absorber. The transpiration unit extends to the side and transpires the water contained in the liquid diffusion sheet to the outside. Those are example.

In the present invention, the liquid diffusion sheet may have the transpiration portion formed at both end portions in the longitudinal direction.

Further, in the present invention, the liquid-permeable sheet is provided with an extension area extending outward of the absorber from an end of the absorber in the longitudinal direction, and the extension area and the liquid diffusion sheet Can be mutually connected with the transpiration part of
In this case, the extension area of the liquid-permeable sheet and the transpiration portion of the liquid diffusion sheet may be mutually bonded by embossing.

In the present invention, the transpiration part of the liquid diffusion sheet includes a plurality of ridges extending in the longitudinal direction of the liquid diffusion sheet, which are formed by alternately bending the transpiration parts in opposite directions. can do.
Further, in the present invention, the liquid diffusion sheet is formed in the longitudinal direction of the liquid diffusion sheet, which is formed by alternately bending the liquid permeable sheet in the opposite direction at least at a portion in contact with the liquid permeable sheet. A plurality of extending barbs may be provided.

In the present invention, the liquid impermeable sheet preferably has a moisture permeability of 300 g / m ² · 24 h or more.

In the present invention, the liquid diffusion sheet can be formed of a spunlaced non-woven fabric containing cellulose fibers.
In the present invention, the liquid diffusion sheet may have a basis weight of 30 to 50 g / m ² .
Furthermore, in the present invention, the liquid diffusion sheet has a liquid absorption height of 120 mm or more after 5 minutes in artificial urine and a water absorption capacity of 2.0 times or more in the water absorption test by the Klemm method. It is preferable to do.

In the present invention, the absorbent article comprises a ventral waistline covering a waist side of a wearer, a back waistline covering a waist side, and a ventral waistline and a back waistline. It is a disposable diaper provided with a covering part which has a crotch part provided between, and the above-mentioned absorber is arranged by the wearer's skin side in this covering part, and a crotch part from a belly side waist part It can pass through and be formed long in the direction of the back waist.
In this case, the covering portion is provided on one side of the ventral waist portion or the back waist portion, and is provided with a fastening tape extending outward in the short direction of the absorber. And a target tape provided on the other side to which the fastening tape is detachably fastened, and the target tape is preferably made of a non-woven fabric.

According to the present invention, the liquid diffusion sheet provided between the absorber and the liquid impermeable sheet is formed at least at one end side in the longitudinal direction of the liquid diffusion sheet from the end portion in the longitudinal direction of the absorber. A transpiration unit is provided which extends outward of the absorber and evaporates the water contained in the liquid diffusion sheet to the outside. Therefore, since the liquid diffusion sheet can release part of the contained moisture to the outside of the absorbent body through the transpiration section, the liquid diffusion sheet can be released between the wearer and the liquid impermeable sheet of the absorbent article. The absorption and diffusion ability can be restored at an early stage regardless of the environment of the inner space.
Moreover, the liquid-permeable sheet rises on the surface of the liquid-permeable sheet opposite to the absorber, in the direction opposite to the absorber, and extends in the direction along the longitudinal direction of the absorber. A plurality of raised portions and a plurality of recessed portions provided between adjacent raised portions.
Therefore, when worn, when the ridge contacts the skin of the wearer, it is possible to more efficiently transpiration water to the outside by the transpiration portion of the liquid diffusion sheet through the recess, whereby liquid diffusion The ability of the sheet to absorb and diffuse waste fluid can be recovered more effectively and earlier.
Therefore, the liquid-permeable sheet can stably maintain a state capable of absorbing and diffusing the excretory fluid, and the entire absorbent can be effectively used for absorption and retention of the excretory fluid.

FIG. 1 is a partially broken perspective view schematically showing an embodiment of the absorbent article according to the present invention. However, the state seen from the liquid-permeable sheet side is shown. FIG. 2 is a partially broken perspective view seen from a direction different from FIG. However, the state as viewed from the covering portion side is shown. FIG. 3 is a plan view schematically showing an embodiment of the absorbent article according to the present invention. FIG. 4 is an enlarged end view of an essential part along line A-A 'in FIG. FIG. 5 is an enlarged end view of an essential part of FIG. However, the covering sheet is omitted. FIG. 6 is an enlarged sectional view of an essential part along the line B-B 'in FIG. However, the ridges and recesses of the liquid-permeable sheet and the covering sheet are omitted. FIG. 7 is an end view of the absorbent article cut along the central portion in the width direction. However, it shows a curved state as a whole (a state when worn by a wearer). FIG. 8 is a view for explaining the movement of waste fluid or water in the absorbent article according to the present invention. However, the white arrow in the figure is the movement direction of the excretory fluid, and the arrow by the broken line is the movement direction of the evaporated water.

1 to 8 show an embodiment of the absorbent article of the present invention, and in this embodiment, the case of a disposable diaper as an absorbent article will be described.
That is, the diaper 1 of this embodiment is attached to the covering portion 2 which covers the skin of the wearer from the waist side to the waist side and the waist side of the wearer's waist and the wearer's portion of the covering portion 2 The absorbent structure 3 which has the absorber 4 which absorbs and hold | maintains waste liquids, such as a urine of a wearer, is provided.

The covering portion 2 forms an exterior of the diaper 1 formed of a material such as a non-woven fabric having air permeability as a whole, and a ventral torso surrounding portion 5 covering a ventral torso and a back side (the heel side) And a crotch 7 provided between the ventral waist portion 5 and the dorsal waist portion 6 from the ventral waist portion 5 to the back waist portion. It is long in the direction of 6.
The ventral waist portion 5 and the back waist portion 6 cover the waist portions of the wearer on the ventral side and the back side, respectively, and by connecting the ventral waist portion 5 and the back waist portion 6 to each other, It is possible to wear the diaper 1 on the wearer. Further, the crotch portion 7 is formed to have a smaller length in the lateral direction than the ventral waistline portion 5 and the back waistline portion 6 so as to fit the crotch region of the wearer.

The absorbent structure 3 is opposite to the liquid-permeable sheet 11 located on the skin side of the wearer and one side of the liquid-permeable sheet 11, that is, opposite to the wearer's skin side in the liquid-permeable sheet 11. A liquid-impervious sheet 12 disposed on the side surface side, and the absorber 4 long in one direction disposed between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12 Have.
The absorbing structure 3 is formed by various bonding means such as adhesion using a hot melt adhesive or the like in a state where the liquid impermeable sheet 12 and the surface of the covering portion 2 on the skin side of the wearer are in close contact with each other. It is joined and is in a state of being attached to the cover 2 by this.
Further, in the absorbent structure 3, a liquid diffusion sheet 13 extending in the longitudinal direction of the absorbent body 4 is disposed between the absorbent body 4 and the liquid impermeable sheet 12. The liquid diffusion sheet 13 and the liquid diffusion sheet 13 are both covered with a liquid-permeable covering sheet 14 in close contact with each other.

Further, on the surface of the liquid-permeable sheet 11 on the skin side of the wearer, a pair of leak- proof walls 15, 15 extending along both ends in the short direction of the absorber 4 are provided. The pair of leak- proof walls 15, 15 fit the crotch portion of the wearer when worn, so that it is possible to prevent leakage of urine, loose feces, etc. from the crotch portion of the diaper 1.
In addition, the pair of leak preventing walls 15, 15 is a side fixed to the surface of the covering portion 2 on the skin side of the wearer so as to cover a part of both end sides in the short direction of the liquid permeable sheet 11 It is an aspect integrally provided in the edge part side by the side of the absorber of sheets 16 and 16.

The absorbent body 4 includes a water absorbing material such as pulp and a highly absorbent material such as a water absorbing polymer, and the dorsal side waist portion from the belly side waist portion 5 in the covering portion 2 through the crotch portion 7 In the direction of 6, it is formed in the shape of a belt which extends long along the wearer's skin-side surface of the covering portion 2 and has a certain thickness. Therefore, this absorber 4 is an aspect arranged so as to cover from the ventral side of the wearer to the crotch and the dorsal side.

In the present invention, as the water absorbing material forming the absorber, for example, wood pulp obtained using softwood or hardwood as a raw material (for example, mechanical pulp such as groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp, etc. Kraft pulp, sulfide pulp, chemical pulp such as alkaline pulp; semi-chemical pulp, etc.) Mercerized pulp or crosslinked pulp obtained by subjecting wood pulp to chemical treatment; bagasse, kenaf, bamboo, hemp, cotton (eg cotton linters) And non-wood pulp; regenerated cellulose such as rayon and fibril rayon; and semi-synthetic cellulose such as acetate and triacetate. However, ground pulp is preferable because it is low in cost and easy to form.

Examples of the superabsorbent materials include starch-based, cellulose-based, and synthetic polymer-based superabsorbent materials. Examples of starch-based or cellulose-based superabsorbent materials include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, etc. Synthetic polymers Examples of superabsorbent materials of the type include polyacrylates, polysulfonates, anhydrides maleates, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates and polyglutamates. And polyalginate-based, starch-based, and cellulose-based superabsorbent polymers (Superabsorbent Polymers: SAP), among which, among these, polyacrylate-based (especially, sodium polyacrylate-based) superabsorbent Resins are preferred. Examples of the shape of the superabsorbent material include particles, fibers, scaly and the like, and in the case of particles, the particle size is preferably 50 to 1000 μm, more preferably 100 to 600 μm. .

The covering sheet is not particularly limited as long as it has liquid permeability and absorber retention, but from the viewpoint of low cost and absorber retention, a tissue formed by a wet method using crushed pulp as the main material is used. preferable.

The liquid-permeable sheet 11 is in contact with the skin of the wearer, absorbs the urine of the wearer quickly, and is transferred to the absorber 4, and any bonding means such as adhesion using a hot melt adhesive Thus, the absorber 4 and the covering sheet 14 are joined to each other.
The liquid-permeable sheet 11 is formed of a non-woven fabric, a woven fabric, a synthetic resin film having liquid permeation holes, a net-like sheet having a mesh, and the like, and is elongated in the longitudinal direction of the absorber. It is an aspect.
In the present invention, the non-woven fabric used for the liquid-permeable sheet includes, for example, natural fibers (eg, wool, cotton etc.), regenerated fibers (eg, rayon, acetate etc.), synthetic resin fibers (eg polyethylene, polypropylene, polybutylene, etc.) Polyolefins such as ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin, etc .; Polyester such as polyethylene terephthalate, polybutylene terephthalate, polybutylene terephthalate, polylactic acid, etc. And polyamides such as nylon).
Non-woven fabrics include core-sheath fibers, side-by-side fibers, composite fibers such as island / sea fibers, hollow fibers, flat fibers, irregular fibers such as Y-type and C-type, latent crimp or overt A crimped three-dimensional crimped fiber; a split fiber etc. which is divided by physical load such as water flow, heat, embossing etc. may be mixed.

On the other hand, the liquid impermeable sheet 12 prevents permeation of discharged excrement fluid to prevent leakage to the outside, and absorption is performed by any bonding means such as adhesion using a hot melt adhesive. The body 4 is joined to one another via the covering sheet 14. In addition, about the surface on the opposite side to the absorber 4 in the liquid impermeable sheet 12, it is joined with the said coating | coated part 2 as mentioned above.
The liquid impermeable sheet 12 is formed larger than the absorber 4 as a whole, and the length of the liquid impermeable sheet 12 along the longitudinal direction and the short direction of the absorber 4 is the absorption. It is longer than the longitudinal length and the latitudinal length of the body 4.
In addition, as this liquid impermeable sheet, for example, a non-woven fabric subjected to waterproofing treatment, a synthetic resin (eg, polyethylene, polypropylene, polyethylene terephthalate etc.) film, a highly water-resistant meltblown non-woven fabric is sandwiched by strong spunbond non-woven fabrics. SMS nonwoven fabric etc. can be used.

The liquid diffusion sheet 13 has a generally rectangular shape in plan view extending in a direction along the longitudinal direction of the absorber 4, and in this embodiment, as shown in FIG. 1 to FIG. 3 and FIG. The length in the longitudinal direction is longer than the length in the longitudinal direction of the absorber 4 and the length in the short direction is smaller than the length in the short direction of the absorber 4. Are disposed at the center position of the absorber 4 in the short direction.
Further, the liquid diffusion sheet 13 is mutually joined to the absorbent body 4 in a state of being in close contact with the absorbent body 12 by any bonding means such as adhesion with a hot melt type adhesive, , And is coated with the absorbent sheet 4 by the covering sheet 14. The liquid diffusion sheet 13 and the cover sheet 14 are adhered to each other by any bonding means such as adhesion using a hot melt adhesive.

The reason why the length in the short direction of the liquid diffusion sheet 13 is made smaller than the length in the short direction of the absorber 4 facilitates the wearing of the diaper and also makes it easier to move the legs, the wearer Not to disturb the fit of the diaper. Moreover, it is for suppressing the usage-amount of the material for manufacture of the liquid diffusion sheet 13, and reducing manufacturing cost.

In general, the liquid diffusion sheet is a little harder and harder to bend than liquid-permeable sheets, liquid non-diffusion sheets, and absorbers, so the portion where the liquid diffusion sheet is present tends to be difficult to deform as compared to the non-existent portion. It is in. Thereby, when it has the short direction length equal to or more than the absorber, the entire diaper is less likely to be deformed, so it becomes difficult to make necessary deformation when the diaper is worn, and the diaper is worn It is difficult for people to wear it. In addition, even after wearing, the diaper may be difficult to fit on the wearer's body, or the wearer may have difficulty moving the legs freely.
On the other hand, the liquid diffusion sheet itself requires a great deal of labor in manufacturing in order to ensure absorbency and diffusion, and since the material is also relatively expensive, a length in the width direction equal to or greater than that of the absorber is ensured. Attempting to do so may increase the manufacturing cost.
Therefore, in this embodiment, the length in the short direction of the liquid diffusion sheet is made smaller than the length in the short direction of the absorber, and the ease of wearing of the diaper, the ease of movement of the legs, and the like In addition to securing the fit of the diaper to the wearer and the like, the amount of materials used for manufacturing the liquid diffusion sheet is suppressed to reduce the manufacturing cost.

The liquid diffusion sheet 13 is disposed at the central position in the short direction of the absorber 4 because the excretory fluid excreted from the wearer is efficiently diffused to the ventral side and the dorsal side of the absorber 4. It is for.
That is, when the diaper is worn, the excrement fluid from the wearer is mainly excreted at about the center position in the short side direction of the absorber, so the liquid diffusion sheet is disposed at the center position in the short side direction of the absorber By doing this, the liquid diffusion sheet can diffuse the waste fluid efficiently.

Here, in the present invention, a non-woven fabric containing cellulose fiber as a main raw material and containing beaten pulp is used as the liquid diffusion sheet, and a wet spunlace non-woven fabric is particularly preferable.
In this case, the beaten pulp is preferably fibrillated. In the present invention, “fibrillation” means that a microfiber portion having a submicron-sized fiber diameter is partially exfoliated from the surface of the main portion of the fiber and extends from the surface of the main portion of the fiber. means.

In the present invention, the cellulose fiber contained in the liquid diffusion sheet is not particularly limited, and examples thereof include natural cellulose, regenerated cellulose, semi-synthetic cellulose and the like.
As the natural cellulose, pulp, for example, wood pulp obtained using softwood or hardwood as a raw material (for example, mechanical pulp such as groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp, etc .; kraft pulp, sulfide pulp, alkali Chemical pulp such as pulp; Semi-chemical pulp etc. Mercerized pulp or crosslinked pulp obtained by subjecting wood pulp to chemical treatment; Non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (eg cotton linters) etc. It can be mentioned.
As the above-mentioned regenerated cellulose, rayon, for example, viscose rayon obtained from viscose, polynozic and modal, copper ammonia rayon obtained from copper ammonia salt solution of cellulose (also referred to as "cupra"); organic compound and water Examples thereof include lyocell and tencel which are obtained by an organic solvent spinning method using an organic solvent which is a mixed solution and which does not pass through a cellulose derivative.
Semi-synthetic celluloses include, for example, acetate fibers such as triacetate and diacetate.

When pulp is used as these natural cellulose and rayon is used as regenerated cellulose, the mixing ratio of these pulp and rayon is preferably 10 to 70 parts by mass of rayon, and more preferably 15 to 65 parts by mass. It is preferable to do. The cellulose fiber and the beaten pulp are preferably contained in a ratio of 60 to 90 parts by mass and 10 to 40 parts by mass, more preferably a ratio of 65 to 75 parts by mass and 25 to 35 parts by mass (however, And the total of cellulose fiber and beaten pulp does not exceed 100 parts by mass).

The liquid diffusion sheet 13 has a basis weight of 20 to 70 g / m ² . By setting the basis weight of the liquid diffusion sheet 13 in this range, a difference in density occurs between the absorber and the liquid diffusion sheet, and the transition of the waste fluid from the absorber to the liquid diffusion sheet becomes smoother. Moreover, as described later, since more capillaries can be formed in relation to the density, it is possible to efficiently diffuse the liquid.
When the basis weight of the liquid diffusion sheet is less than 20 g / m ^{2, the} amount of fibers decreases and the amount of capillary tube formation is insufficient and both the liquid transport amount and distance become short, and when it exceeds 70 g / m ² , the fiber amount becomes too large The material hardness is noticeable, causing a problem in wearability.
The basis weight of the liquid diffusion sheet 13 is more preferably 30 to 60 g / m ^2, and still more preferably 35 to 55 g / m ² .

Furthermore, the liquid diffusion sheet 13 has a density of about 50 to 280 mg / cm ³ , preferably a density of 60 to 200 mg / cm ³ .
By setting the density of the liquid diffusion sheet 13 in this range, it is possible to form many capillaries suitable for diffusing the absorbed waste fluid between the fibers in the liquid diffusion sheet. Thus, it is considered that the liquid diffusion sheet can more efficiently carry out the capillary movement of the excretory fluid, and the liquid diffusibility is further enhanced.
On the other hand, if the density exceeds 280 mg / cm ³ , the number of voids in the liquid diffusion sheet becomes too small to make it difficult to form a capillary, so that the liquid diffusibility is lowered. On the other hand, if the density is less than 50 mg / cm ^3, although the voids in the liquid diffusion sheet increase, capillary action is less likely to occur, and the movement of the excretory fluid becomes slow, and the liquid diffusivity also decreases.

The liquid diffusion sheet 13 preferably has a liquid absorption height of 120 mm or more, more preferably 135 mm or more, and still more preferably 140 mm or more in the water absorption test by the Klem method after 5 minutes of artificial urine. is there. Furthermore, the water absorption capacity is preferably 2.0 times or more, more preferably 2.6 times or more, and still more preferably 3.0 times or more.
If the liquid absorption height is too small, the absorbent can not be efficiently wetted. If the water absorption capacity is too small, the liquid can not be efficiently transferred to the pulp / superabsorbent polymer forming the absorbent core.
In addition, the water absorption test by a Klem method is performed according to JISP 8141: 2004.

Usually, paper is manufactured through processes such as paper making (including heat fusible fibers and binders), drying, and optionally thermocompression bonding, so that it has a uniform cross-sectional structure, and in general, when the density decreases, the interfiber voids Is considered to be large and the capillary diameter is to be large. Also, it is considered that the suction height decreases and the suction amount increases.
However, when the liquid diffusion sheet is made into a wet spunlace non-woven fabric as described above, this wet spunlace non-woven fabric already has a dense structure by papermaking, water jet and drying steps (by hydroentanglement The confounding part is in a dense state). By the subsequent drying process, the bulk of the non-woven fabric comes out to form a sparse portion due to the state of bulk other than the water flow entangled portion.
Therefore, in the liquid diffusion sheet using the wet spunlace non-woven fabric, since the dense / dense structure is already formed, if the density between the entangled parts which are sparse is lowered, the suction amount is increased and the density is high. It is considered that the entangled portion is supplied with liquid from between the entangled portions, and the suction height is further increased.

Here, the liquid diffusion sheet 13 extends from the end portion in the longitudinal direction of the absorbent body 4 to the outer side of the absorbent body 4 at both end sides in the longitudinal direction of the liquid diffusion sheet 13. Transpiration units 20 and 21 for transpiration the water contained in the outside to the outside.
That is, the liquid diffusion sheet 13 is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the absorber 4 and both end sides in the longitudinal direction are both end portions in the longitudinal direction of the absorber 4, ie, In the state where each of the absorbers 4 extends outward from the ventral side to the outside of the absorber, the extended portions form the transpiration portion 20 on the ventral side and the transpiration portion 21 on the dorsal side. Therefore, the transpiration units 20 and 21 themselves are not in contact with the absorber 4 at all, and the transpiration units 20 and 21 do not cause adhesion of water by direct contact with the absorber 4.

The reason that the transpiration sections 20 and 21 are formed at the end of the liquid diffusion sheet 13 in the longitudinal direction is to restore the absorption and diffusion ability of the liquid diffusion sheet 13 at an early stage.
That is, as described above, when the liquid diffusion sheet continues diffusing the waste liquid toward the ventral side or the back side of the absorber, the amount of waste liquid moving from the liquid diffusion sheet to the absorber gradually decreases, Since the rate of absorption of waste fluid held by the liquid diffusion sheet into the absorber decreases, recovery of the liquid diffusion sheet's absorption and diffusion ability is delayed.
In this case, the portion of the absorber used for absorption and retention of the excrement is the portion in contact with the liquid diffusion sheet on the ventral side or the dorsal side of the absorber or only the portion in the vicinity thereof. In fact, the more internal part of is not used for absorption and retention of waste fluid. Therefore, the absorption and retention capacity of the excretory fluid as a whole is still often surplus.
Therefore, in order to effectively use the entire absorber for absorption and retention of waste fluid, the waste fluid held by the liquid diffusion sheet is sequentially moved to the inside of the absorber to absorb the liquid diffusion sheet. By recovering the diffusion ability as early as possible, it is ideal to maintain a state in which waste fluid can be sequentially diffused and absorbed on the ventral side and the dorsal side of the absorber.

However, as described above, when the amount of waste fluid held by the absorber increases, the amount and movement speed of the waste fluid moving from the liquid diffusion sheet to the absorber decrease. The fact is that the recovery of absorption and diffusion capacity is gradually delayed.
On the other hand, when the diaper is worn, the wearer's belly, thigh or crotch (footrest) is in close contact with the skin, so the wearer usually discharges the excretory fluid from the wearer. The internal space between the diaper and the diaper (especially between the wearer and the liquid-impervious sheet) has a significant increase in humidity and becomes moist. In this case, the liquid diffusion sheet may absorb the moisture, which may hinder the recovery of the absorption / diffusion ability of the liquid diffusion sheet.
In this case, the liquid diffusion sheet may considerably slow or hardly recover the absorption and diffusion ability, and it is substantially difficult to maintain a state in which the excretory fluid can be sequentially diffused and absorbed. It becomes.

Therefore, in the present invention, the end of the liquid diffusion sheet in the direction along the longitudinal direction of the absorber is provided with a transpiration part extending from the end in the longitudinal direction of the absorption body, and the liquid diffusion sheet through the transpiration part It is configured to be able to diffuse the water contained in to the outside. As a result, the absorption of the liquid diffusion sheet and the recovery of the diffusion ability are promoted, and the state capable of sequentially absorbing and diffusing the excretory fluid can be maintained as much as possible.

By the way, the liquid-permeable sheet 11 is both end sides in a direction along the longitudinal direction of the absorber 4, that is, each end of the covering side 2 on the belly side waist side 5 side and the back side waist side 6 side. In addition, extending regions 25 and 26 extending outward of the absorber 4 from the longitudinal end of the absorber 4 are provided.
In this embodiment, the length in the longitudinal direction of the liquid-permeable sheet 11 is formed to be longer than the length in the longitudinal direction of the absorber 4, and the longitudinal direction of the absorber 4 in the liquid-permeable sheet 11 is The portions extending from both end portions of the liquid permeable sheet 11, that is, the portions not formed in contact with the absorber 4 and formed on the both end sides in the longitudinal direction of the liquid permeable sheet 11 become the extended regions 25 and 26, respectively. There is.
The liquid-permeable sheet 11 and the liquid diffusion sheet 13 are each formed in a length such that the positions of both ends in the longitudinal direction substantially coincide with each other, and the transpiration portion 20 on the ventral side extends on the ventral side From the region 25, the transpiration part 21 on the back side does not protrude from the extension region 26 on the back side, and is in a state of being contained within the range of the extension regions 25 and 26.

Further, the extension regions 25 and 26 are joined to the transpiration units 20 and 21 of the liquid diffusion sheet 13, and from the transpiration units 20 and 21 at the contact portions with the transpiration units 20 and 21. It is possible to absorb or permeate the evaporated water and finally release the water to the outside of the diaper.
On the other hand, these extended regions 25 and 26 are not in contact with the absorber 4 at the portions in contact with the transpiration units 20 and 21, and thus are in contact with the respective transpiration units 20 and 21. In the portion where it does, adhesion of water by direct contact with absorber 4 does not occur.
The extended areas 25 and 26 and the transpiration units 20 and 21 are joined to each other by adhesion using a hot melt adhesive, and the transpiration units 20 and 21 are connected to the extended areas 25 and 26. And the liquid impervious sheet 12 in a state of overlapping.

Furthermore, as shown in FIG. 1 and FIG. 7, the extension regions 25, 26 are in the state of being closer to the transpiration part 20, 21 side of the liquid diffusion sheet 13 by the thickness of the absorber 4. It is joined with the transpiration units 20 and 21 respectively. Therefore, when the diaper 1 is worn, spaces 28 and 29 are formed by the thickness t of the absorber 4 on the wearer's skin side of the wearer and the extension areas 25 and 26 of the liquid-permeable sheet 11 It has become so.
Thereby, the space for the thickness of the absorber 4 formed between the wearer and the surface on the skin side of the wearer in the extension regions 25 and 26 for the water to be transpirationed from the transpiration units 20 and 21. It is made easy to discharge | release to the exterior of the diapar 1 through 28,29, and promotion of the transpiration of the water | moisture content by this transpiration part 20,21 is achieved. As a result, the absorption and diffusion capabilities of the liquid diffusion sheet 13 can be efficiently recovered.

Further, the transpiration portions 20 and 21 of the liquid diffusion sheet 13 and the extension regions 25 and 26 of the liquid permeable sheet 11 are bonded by embossing separately from the bonding using the above-described hot melt adhesive or the like. It is carried out, and bonding is made in close contact with each other.
Specifically, the transpiration sections 20 and 21 of the liquid diffusion sheet 13 and the extension areas 25 and 26 of the liquid-permeable sheet 11 are embossed by embossing in a state in which opposing surfaces are in contact with each other. The thickness direction of the ventral side transpiration part 20 and ventral side extension region 25 and the thickness direction of the transpiration part 21 on the back side and the extension region 26 on the back side are respectively compressed, and these transpiration parts 20 , 21 and the extension areas 25 and 26 are crimped.
Thereby, the separation between the transpiration units 20 and 21 and the extension regions 25 and 26 can be prevented, and the water evaporated at the transpiration units 20 and 21 can be stably released through the extension regions 25 and 26. There is. Furthermore, when a small amount of water such as sweat from the wearer adheres to the extension areas 25 and 26, the water is efficiently moved and absorbed from the extension areas 25 and 26 to the transpiration units 20 and 21. The liquid return (rewet) to the liquid permeable sheet 11 is suppressed, and the discomfort to the wearer due to sweat or the like can be suppressed.

There is no particular limitation on the embossing pattern used for the embossing, but for example, a lattice shape in plan view (for example, when embossing, a substantially rectangular frame portion is a recess, and a portion surrounded by the recess is a protrusion Or a dot-like pattern can be used.

Furthermore, the liquid-permeable sheet 11 rises on the surface of the liquid-permeable sheet 11 opposite to the absorbent 4 in the direction opposite to the absorbent 4 and is adjacent to the plurality of raised portions 11 a. A plurality of recesses 11b are provided between the corresponding protrusions 11a and 11a.
In this embodiment, each of the plurality of raised portions 11a is configured to extend in the direction along the longitudinal direction of the absorbent body 4, and is spaced from the adjacent raised portions 11a by a predetermined distance. Are arranged in Further, the concave portion 11b is in the form of a groove formed between the adjacent protruding portions 11a and 11a and extending in the direction along the longitudinal direction of the absorber 4.
Therefore, in the surface of the liquid-permeable sheet 11 on the skin side of the liquid-permeable sheet 11 on which the protuberances 11 a and the recesses 11 b are formed, the irregularities as a whole continue alternately in the width direction of the absorber 4. It has been formed.
When the diaper 1 is worn, the top of the raised portion 11a abuts on the skin of the wearer while the recess 11b does not abut on the skin of the wearer at least in part. A space is formed between the skin and the skin, and the passage of air communicating the internal space between the wearer and the diaper 1 with the outside of the diaper 1.
In this embodiment, the protuberances 11a are tapered in the direction of the skin side of the wearer, and have a cross-sectional shape in which the top is gently curved. Further, the bottom portion of the concave portion 11 b is formed in a gently curved cross section.

Here, the reason that the ridges 11a and the recesses 11b are formed on the skin-side surface of the liquid-permeable sheet 11 is the internal space between the diaper 1 and the skin of the wearer and the outside of the diaper. It is for the purpose of allowing air to flow between the interior space so that the moisture in the internal space can be released to the outside of the diaper 1 as much as possible.
Specifically, when the wearer wears a diaper, the liquid-permeable sheet abuts on the wearer's skin, and the ventral waistline portion and the back waistline portion in the covering portion of the diaper are worn to some extent by the wearer It is normal for the wearer to be in intimate contact with the wearer. Then, if no measures are taken, moisture from the wearer's excrement or moisture from sweat or the like will continue to stay in the internal space between the diaper and the wearer's skin, so the humidity will be extremely high. There is a possibility that the skin of the wearer may get stuffy by raising.
On the other hand, most of the water evaporated from the transpiration part of the liquid diffusion sheet is released to the outside through the liquid diffusion sheet. At this time, when the wearer's skin-side surface of the liquid-permeable sheet is in close contact with the wearer, moisture taken away from the transpiration part is released to the outside of the diaper if no measures are taken. There is a possibility of getting into the internal space between the diaper and the wearer's skin again.
Therefore, in the present invention, the ridge and the recess form a gas passage which can be constantly ventilated between the inner space between the wearer's skin and the diaper and the outside of the diaper when the diaper is worn. Thus, the moisture in the internal space and the moisture transpirationed from the transpiration portion of the liquid diffusion sheet can be reliably released to the outside of the diaper.

In addition, when forming the protruding part 11a and the recessed part 11b in the said liquid-permeable sheet 11, although an arbitrary method can be used, it can form by embossing using a pair of embossing roll, for example. In this case, on the outer peripheral surface of one emboss roll, the circumferentially extending concave and convex portions forming the protuberances 11a and the concaves 11b are alternately disposed to form the other emboss roll having a flat outer peripheral surface. The ridges and recesses can be continuously formed on the liquid-permeable sheet by passing the liquid-permeable sheet having flat surfaces on both sides during the period.
Alternatively, heated air is continuously jetted from a nozzle disposed at a constant interval to one surface side of the liquid-permeable sheet continuously transported in a predetermined direction, and the liquid-permeable sheet It can be formed by scraping the fibers on one side in the direction orthogonal to the transport direction of the liquid-permeable sheet. At this time, on one surface of the liquid-permeable sheet, the portion where air hits is between the concave portion and the adjacent concave portion, and the raised fiber is the raised portion where the scraped fibers are stacked and raised.

Further, the liquid impermeable sheet 12 has a moisture permeability of 300 g / m ² · 24 h or more and does not allow liquid to permeate, but it is possible to permeate moisture that has become gas, that is, water vapor. .
Thereby, the liquid impermeable sheet 12 is made to permeate | transmit a part of the moisture (water vapor) of transpiration among the water | moisture contents which the liquid diffusion sheet 13 contains including the said transpiration part 20,21, and the water vapor is It can be discharged to the outside of the diaper through the covering portion 2.
As a result, the transpiration of the water contained in the liquid permeable sheet is promoted, and the ability of the liquid permeable sheet to absorb and diffuse the excretory fluid can be recovered earlier.
Here, if the moisture permeability of the liquid impermeable sheet is less than 300 g / m ² · 24 h, it is difficult for the liquid permeable sheet to permeate the evaporated water, so that the diaper can be made to permeate the liquid impermeable sheet. It is difficult to release the water outward.
The moisture permeability of the liquid impermeable sheet is preferably 2000 g / m ² · 24 h or more. Further, the upper limit of the moisture permeability is not particularly limited as long as it does not allow liquid to permeate but water vapor to permeate.
In addition, the measurement of this moisture permeability is performed based on the moisture permeability test method of JISZ0208.

Furthermore, in the absorption structure 3, the liquid diffusion sheet 13 and the liquid-permeable sheet are provided in the transpiration portion 21 on the back side of the liquid diffusion sheet 13 and the extension region 26 on the back side of the liquid-permeable sheet 11. There are formed ridge- like portions 31 and 32 extending in substantially the longitudinal direction of 11.
Specifically, in the transpiration part 21 on the back side, the transpiration parts 21 on the back side are alternately reversed, that is, a direction on the liquid permeable sheet 11 side and a direction on the liquid impermeable sheet 12 side. A plurality of transpiration part side weir-like parts 31 extending in the longitudinal direction of the liquid diffusion sheet 13 which are formed by bending into two or more are provided.
On the other hand, in the extension area 26 on the back side, the extension areas 26 on the back side are alternately bent in the reverse direction, that is, alternately, in the direction of the wearer's skin and in the direction of the liquid impermeable sheet 12 A plurality of extension region side ridges 32 extending in the longitudinal direction of the liquid-permeable sheet 11 are provided.

As described above, in this embodiment, since the transpiration part 21 on the back side and the extension region 26 on the back side are mutually connected, as shown in FIG. In the part where the transpiration part 21 and the extension area 26 on the back side are connected, the transpiration part 21 and the extension area 26 are alternately alternately bent in an overlapping state.
Therefore, at the portion where the transpiration part 21 on the back side is in contact with the extension area 26 on the back side, the transpiration part side weir-like part 31 and the extension area side weir-like part 32 integrally overlap. It has been formed.
The transpiration part side weir-like part 31 is formed in the entire transpiration part 21 on the back side, and the extension region side weir-like part 32 is formed on the entire back extension area 26. Therefore, in the extension region 26 on the back side, the extension region side weir-like portion 32 is formed even in a portion not in contact with the transpiration part 21 on the back side.

Between the adjacent transpiration-portion-side ridge-like portions, the transpiration-portion-side ridge-like portions are provided (in the case of this embodiment, the adjacent extension-region-side ridge-like portions 32, 32) By forming a space in between), so that the entire skin-side surface (i.e., the surface on the liquid-permeable sheet side) of the transpiration part does not conform to the skin of the wearer.
That is, when the liquid diffusion sheet absorbs and diffuses the excrement liquid, the transpiration part also contains moisture and becomes wet, but the surface of the wearer of the moist transpiration part is the wearer Along the skin, moisture can contact the wearer's skin through the liquid permeable sheet. In particular, in the transpiration part, when the diaper is worn, a fastening tape to be described later provided on the covering part is fixed to the target tape, and pressed against the skin side of the wearer from the ventral waistline and back waistline. Therefore, it is conceivable that moisture contained in the transpiration portion comes in contact with the skin of the wearer and is steamed.
Therefore, in this embodiment, the transpiration part side weir-like part 31 is provided in the transpiration part 21 of the back side, and the surface of the wearer's skin side of the transpiration part 21 is along the skin of the wearer. By doing so, the skin's skin is kept as cold as possible.

Also, another reason for providing the transpiration part side weir is that the water formed in the transpiration part can be efficiently removed from the diaper using the space formed between the adjacent transpiration part side weirs. To release it.
On the other hand, the extension region side ridge portion is provided by using the space formed between the adjacent extension region side ridge portions to the outer side of the diaper of the water which has been evaporated at the transpiration portion. Release into the diaper, as well as ensuring ventilation between the interior space between the wearer's skin and the diaper and the exterior of the diaper to release the moisture in the interior space directly to the exterior of the diaper It is for.

In this embodiment, as shown in FIGS. 1, 2 and 6, the extension region 26 on the back side of the liquid-permeable sheet 11 and the extension on the back side of the liquid-impermeable sheet 12 A stretchable elastic member 33 is disposed between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12 and extends in the short direction of the liquid-permeable sheet 11 and the liquid-impervious sheet 12. Then, both the transpiration portion side weir-like portion 31 and the extension region side weir-like portion 32 are formed by utilizing elastic expansion and contraction in the axial direction of the elastic member 33.
Specifically, the extension region 26 on the back side of the liquid-permeable sheet 11 and the transpiration portion 21 on the back side of the liquid diffusion sheet 13 with the elastic member 33 extended, and the liquid-impermeable sheet 12 The elastic member 33 is contracted after fixing in between. Then, when the elastic member 33 contracts to a non-elongating state, the transpiration portion 21 on the back side, the extension region 26 on the back side, and further, the transpiration portion 21 and the extension region 26 in the liquid impermeable sheet 12. In this embodiment, both the transpiration part side weir-like part 31 and the extension region side weir-like part 32 are formed. At this time, with regard to the liquid impermeable sheet 12 and the covering portion 2 joined to the liquid impermeable sheet 12 as well, in the area where the elastic member 33 is provided and in the vicinity thereof, the transpiration portion side creases The hooked portion is integrally formed with the hooked portion 31 and the extension region side hooked portion 32.
In addition, as the elastic member 33, an elastically stretchable sheet-like member, an elastically stretchable urethane film, or the like formed of a material such as polyurethane foam, synthetic rubber foam, polystyrene foam or the like may be used. Can.

Further, the covering portion 2 is extended toward the outside in the short direction of the absorber 4 provided on either one of the ventral waist portion 5 and the back waist portion 6. The fastening tapes 35, 35 and the target tape 36 provided on the other side to which the fastening tapes 35, 35 are detachably fastened are provided.
In this embodiment, the fastening tapes 35, 35 are respectively provided on both ends of the back waistline 6 along the short direction of the absorber 4, while the outer surface of the belly waistline 5 A target tape 36 is provided on the side.
The fastening tape 35 is provided with a plurality of small hooks (not shown) on the side of the ventral waist part 5 that contacts the target tape 36, and these hooks are hooked on the fibers of the target tape 36. Thus, the fastening tape 35. 35 and the target tape 36 are detachably connected.
The target tape 36 is disposed at a position overlapping with the position of the transpiration portion 20 on the ventral side of the liquid diffusion sheet 13 in the ventral waistline portion 5.

Here, the target tape 36 is formed of a non-woven fabric having excellent breathability.
The target tape 36 is formed of a non-woven fabric in order to ensure the air permeability of the portion of the covering portion 2 where the target tape 36 is disposed.
As described above, in this embodiment, the water permeability of the liquid impermeable sheet 12 of the absorbent structure 3 is set to 300 g / m ² · 24 h or more, and the water absorbed by the liquid diffusion sheet 13 is evaporated. Can be released to the outside of the diaper 1 through the liquid impermeable sheet 12 and the covering portion 2.
However, the presence of the target tape on the outer surface side of the covering portion may prevent the evaporated water from being released to the outside of the diaper if the covering portion loses the air permeability at the position where the target tape is disposed. There is sex. In particular, in the position where the target tape is disposed, the ventral waistline portion and the back waistline portion of the covering portion are crimped to the waistline of the wearer by the fastening tape, and the transpiration portion of the liquid diffusion sheet is positioned Since it is a part, in order to suppress steaming and not to inhibit the transpiration of water from the transpiration part, it is necessary to secure air permeability also for the target tape itself.
Therefore, in this embodiment, the target tape 36 is formed of a non-woven fabric having excellent breathability so that the breathability of the covering portion 2 is secured.

The fibers constituting the non-woven fabric forming the target tape include, for example, natural fibers (eg, wool, cotton etc.), regenerated fibers (eg, rayon, acetate etc.), synthetic resin fibers (eg polyethylene, polypropylene, polybutylene, ethylene- Polyolefins such as vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; Polyester such as polyethylene terephthalate, polybutylene terephthalate, polybutylene terephthalate, polylactic acid, etc .; Nylon And the like). Non-woven fabrics include core / sheath fibers, side-by-side fibers, composite fibers such as island / sea fibers; hollow fibers; flat fibers, irregular fibers such as Y-type and C-type; latent crimp or overt presence A crimped three-dimensional crimped fiber; split fibers divided by physical load such as water flow, heat, embossing, etc. may be mixed.

As shown in FIG. 8, when the excretory fluid is discharged from the wearer, the diaper 1 as the absorbent article having the above configuration absorbs the excrement fluid through the liquid permeable sheet 11 in the absorbent material 4 of the crotch portion. However, since the excretory fluid that can not be absorbed at this time reaches the liquid impermeable sheet 12 side, it is absorbed by the liquid diffusion sheet 13. Then, the waste liquid absorbed by the liquid diffusion sheet 13 starts to move through the liquid diffusion sheet 13 by capillary action. At this time, the waste fluid absorbed by the liquid diffusion sheet 13 moves and diffuses regardless of the gravity also in the longitudinal direction of the liquid diffusion sheet 13, and finally, the absorption on the ventral side or the dorsal side of the absorber 4 It will be absorbed and held by the body 4.

At this time, the liquid diffusion sheet 13 extends from the end portion in the longitudinal direction of the absorbent body 4 to the outer side of the absorbent body 4 at both end sides in the longitudinal direction, and the water contained in the liquid diffusion sheet 13 The liquid diffusion sheet 13 can release most of the contained water to the outside through the transpiration units 20, 21 instead of the absorber, because the .
Thereby, regardless of the environment of the internal space between the wearer and the liquid impermeable sheet 12 of the diaper 1, the moisture contained in the liquid diffusion sheet 13 can be transmitted to the diaper 1 through the transpiration units 20 and 21. Since the liquid diffusion sheet 13 can be released to the outside, the absorption and diffusion ability of the liquid diffusion sheet 13 can be recovered at an early stage.

Moreover, the liquid-permeable sheet 11 is adjacent to a plurality of raised portions 11 a provided on the surface of the liquid-permeable sheet 11 opposite to the absorber 4 and extending in the direction along the longitudinal direction of the absorber 4. When the diaper 1 is worn, the plurality of recessed portions 11b provided between the protruding portions 11a and 11a makes the protruding portion 11a contact the wearer's skin while the recess 11b is the wearer's skin and the diaper It becomes a space which makes the interior space between 1 connect with the diaper exterior.
Therefore, the ventilation between the wearer's skin and the internal space between the diaper 1 and the outside of the diaper can be ensured, and the release of the water transpired in the transpiration units 20 and 21 to the outside can be made more efficiently. The ability to absorb and diffuse waste fluid in the liquid diffusion sheet 13 can be recovered more effectively and earlier.

As a result, it is possible to stably maintain a state in which the liquid diffusion sheet 13 can absorb and diffuse the excrement fluid, and it becomes possible to effectively use the entire absorber 4 for absorption and retention of the excrement fluid.

In the above embodiment, although the transpiration sections 20 and 21 are provided on both ends in the longitudinal direction of the liquid diffusion sheet 13, the transpiration sections do not necessarily have to be provided on both ends in the longitudinal direction. And at least one end of the liquid diffusion sheet in the longitudinal direction.
Furthermore, in the above-described embodiment, one liquid diffusion sheet 13 having a longitudinal length longer than the longitudinal length of the absorber 4 is used, but a plurality of the liquid diffusion sheets may be disposed. You may

Further, the liquid diffusion sheet 13 does not necessarily need to be continuous in the longitudinal direction of the absorber 4, and a plurality of liquid diffusion sheets whose longitudinal length is shorter than the longitudinal length of the absorber may be used. One end side in the longitudinal direction of the diffusion sheet may be a transpiration portion, and the evaporation sheet may be extended outward from the end portion in the longitudinal direction of the absorber.
In this case, for example, with the two liquid diffusion sheets whose longitudinal length is shorter than the longitudinal length of the absorber, the ventral side and the back side of the absorbent body being separated from each other at the center position in the lateral direction. For the liquid diffusion sheet on the ventral side, the transpiration part is extended from the end of the longitudinal side of the absorber in the longitudinal direction, while for the liquid diffusion sheet on the back side, the transpiration part is the longitudinal back of the absorbent body It can be made into the aspect made to extend from the side edge part. As a result, each liquid diffusion sheet can diffuse the excretory liquid, and can evaporate water at each transpiration part, so that the same effect as that of the above-described embodiment can be obtained. However, for each liquid diffusion sheet, it is important that the end in the longitudinal direction on the side where the transpiration part was present be located in the part where the excretory liquid is discharged in a large amount in the absorber, that is, the crotch part or its vicinity. .

Furthermore, in the above-mentioned embodiment, although the transpiration part 20 and 21 of the liquid diffusion sheet 13 and the extension area 25 and 26 of the liquid permeable sheet 11 are joined, these transpiration part and the extension area And does not necessarily have to be joined. Moreover, it is not necessary to mutually bond a transpiration part and an extension area | region by embossing, and it is not necessary to press-fit these transpiration part and extension area | region by embossing.

Moreover, about the said embodiment, the transpiration part side ridge-like part 31 and liquid permeability in the transpiration part 21 of the back side of the said liquid diffusion sheet 13 and the extension area | region 26 of the back side of the liquid permeable sheet 11 respectively Although the sheet side weirs 32 are formed, these weirs may be provided on the ventral side transpiration part or the ventral side extension region, or the weir may not be provided. Further, the bowl-shaped portion may be provided only in the transpiration portion or only in the extension region.

In the embodiment described above, the liquid impermeable sheet 12 used has a permeability of 300 g / m ² · 24 h, but the permeability can permeate the evaporated water but does not permeate the liquid. If it is a range, it can be made into arbitrary permeability. Alternatively, the liquid impermeable sheet may not necessarily be capable of transmitting the evaporated water.

In the embodiment, the liquid diffusion sheet 13 is formed of a wet spunlace non-woven fabric, but the liquid permeable sheet can diffuse the excretory fluid, It may be a dry spunlace nonwoven fabric or a tissue.
With regard to the liquid diffusion sheet, it is possible to arbitrarily set the basis weight, the liquid absorption height and the water absorption capacity, etc. in the water absorption test by the Klem method, as long as waste liquid can be absorbed and diffused reliably and stably. it can.

In the embodiment, each of the raised portions 11a of the liquid-permeable sheet 11 is configured to extend in the direction along the longitudinal direction of the absorber 4, and the recessed portions 11b are adjacent to the raised portions 11a and 11a. The groove formed in the longitudinal direction of the absorber 4 is formed between them.
However, the raised portions do not necessarily have to extend in the direction along the longitudinal direction of the absorber; for example, they have a substantially circular shape in plan view (the state viewed from the wearer's skin side of the liquid permeable sheet) The shape may be various shapes such as a substantially elliptical shape or various polygonal shapes such as a substantially square shape and a hexagonal shape.
On the other hand, the recess is provided between the adjacent ridges, and when the top of the ridge is in contact with the skin of the wearer, at least a part does not contact the skin of the wearer A space is formed between the wearer's skin and the wearer's skin, as long as it can be a passage of air that communicates the interior space between the wearer and the diaper with the exterior of the diaper. Can. For example, when the raised portion has a substantially circular shape in plan view, a recess may be formed so as to surround the periphery of the raised portion.

Moreover, although the said embodiment demonstrated the case of the expansion | deployment type diaper worn by fastening a fastening tape to a target as an absorbent article, the absorbent article of this invention is a pants-type diaper. In addition to diapers, various absorbent articles such as sanitary napkins and incontinence pads may be used.

1 Absorbent articles (disposable diapers)
2 Covering part 3 Absorbent structure 4 Absorbing body 5 Abdominal waistline part 6 Backside waistline part 7 Crotch part 11 liquid permeable sheet 11a raised part 11b recessed part 12 liquid impermeable sheet 13 liquid diffusion sheet 20, 21 transpiration part 25, 26 extension area 31, 32 ridge 35 fastening tape 36 target tape

Claims (12)

1. A liquid-permeable sheet, a liquid-impermeable sheet disposed on one side of the liquid-permeable sheet, and one direction disposed between the liquid-permeable sheet and the liquid-impermeable sheet An absorbent article comprising a long absorbent body,
   The liquid-permeable sheet is provided between a plurality of raised portions provided on the surface of the liquid-permeable sheet opposite to the absorber and rising in the direction opposite to the absorber and an adjacent raised portion. And a recess provided in the
   A liquid diffusion sheet extending in the longitudinal direction of the absorber is disposed between the absorber and the liquid impermeable sheet, and the liquid diffusion sheet is disposed on at least one end side in the longitudinal direction of the liquid diffusion sheet. An absorbent article, comprising: a transpiration part extending outward of the absorbent body from an end in the longitudinal direction of the absorbent body and allowing the water contained in the liquid diffusion sheet to evaporate to the outside.
2. The absorbent article according to claim 1, wherein the transpiration portion is formed at both end portions in the longitudinal direction of the liquid diffusion sheet.
3. The liquid-permeable sheet is provided with an extension region extending outward of the absorber from the end in the longitudinal direction of the absorber, and the extension region and the transpiration part of the liquid diffusion sheet are mutually joined. The absorbent article according to claim 1 or 2, which is
4. The absorbent article according to claim 3, wherein the extension area of the liquid-permeable sheet and the transpiration portion of the liquid diffusion sheet are bonded to each other by embossing.
5. The transpiration part of the liquid diffusion sheet includes a plurality of ridges extending in the longitudinal direction of the liquid diffusion sheet, which are formed by alternately bending the transpiration parts in opposite directions. The absorbent article according to any one of the items.
6. The liquid diffusion sheet has a plurality of ridges extending in the longitudinal direction of the liquid diffusion sheet, formed by alternately bending the liquid permeable sheets in opposite directions at least at a portion in contact with the liquid permeable sheet. The absorbent article according to any one of claims 1 to 5, comprising:
7. The absorbent article according to any one of claims 1 to 6, wherein the liquid impermeable sheet has a moisture permeability of 300 g / m ² · 24 h or more.
8. The absorbent article according to any one of claims 1 to 7, wherein the liquid diffusion sheet is formed of a spunlaced non-woven fabric containing cellulose fibers.
9. The absorbent article according to any one of claims 1 to 8, wherein the liquid diffusion sheet has a basis weight of 30 to 50 g / m ² .
10. The liquid diffusion sheet according to any one of claims 1 to 9, wherein a liquid absorption height after 5 minutes of artificial urine is 120 mm or more and a water absorption capacity is 2.0 times or more in a water absorption test by the Klem method. The absorbent article according to item 1.
11. The absorbent article is provided between a ventral waistline covering the waist side of the wearer, a back waistline covering the back waist, and the ventral waistline and the back waistline. It is a disposable diaper provided with the covering part which has a crotch part, and the above-mentioned absorber is allocated by the skin side of the wearer in this covering part, and it passes through the crotch from the ventral waist part to the back waist part. The absorbent article according to any one of claims 1 to 10, which is elongated in the direction of the part.
12. The covering portion is provided on one side of the ventral waistline portion or the back waistline portion, and is provided on a fastening tape extending outward in the short direction of the absorbent body, The absorbent article according to claim 11, further comprising: a target tape that is provided and to which the fastening tape is detachably fastened, wherein the target tape is formed of a non-woven fabric.

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