WO2016148192A1

WO2016148192A1 - Absorbent article

Info

Publication number: WO2016148192A1
Application number: PCT/JP2016/058324
Authority: WO
Inventors: 涼子栗原
Original assignee: 大王製紙株式会社
Priority date: 2015-03-16
Filing date: 2016-03-16
Publication date: 2016-09-22
Also published as: JP6047606B2; JP2016168299A

Abstract

The present invention is capable of preventing leakage along a concave trench and maintaining diffusibility and absorption speed even when a large amount of urine is discharged at once. An upper layer absorber (4A) is provided with, at an area including a portion where a concave trench (22) is to be formed, a slit (25) penetrating the skin side surface and the non-skin side surface. Embossing is performed from the skin side on an area including the slit (25) but broader than the slit (25) while not reaching the margin, to provide a lower layer absorber (4B) with a mesh-like embossed trench (26) having a continuous mesh-like pattern and to form at least the area provided with the mesh-like embossed trench (26) into a concave part (27) that is depressed from the margin. As a result of forming the concave part (27), a hollow part (30) is formed between the upper layer absorber (4A) and the lower layer absorber (4B). The hollow part (30) is set as a temporary storage space for urine.

Description

Absorbent articles

The present invention relates to an absorbent article mainly used for incontinence pads, disposable diapers and the like, and more particularly to an absorbent article having a groove formed along the longitudinal direction on the skin side.

Conventionally, as the absorbent article, an absorbent body is interposed between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. It has been known.

Many improvements have been made to this type of absorbent article, and various products having means for quickly absorbing the discharged urine have been developed. For example, in the following Patent Document 1, the absorber includes an upper layer absorber on the skin contact surface side and a lower layer absorber on the non-skin contact surface side, and the upper layer absorber and the lower layer absorber form. An absorptive article is disclosed in which a middle and high portion located at a substantially central portion of the lower layer absorbent body has a recess extending in a longitudinal direction formed at a substantially central portion on the skin contact surface side.

Moreover, in the following Patent Document 2, the absorber has an upper layer and a lower layer in order from the surface material side, and a concave portion continuous in a honeycomb shape is compressed at a portion corresponding to the upper layer on the upper surface of the lower layer. A body fluid absorbent article is disclosed in which the density of the upper layer and the density of the portion corresponding to the upper layer in the lower layer are set to predetermined densities, respectively.

Japanese Patent No. 5132264 Japanese Patent No. 3816429

In the absorbent article in which a groove is formed along the longitudinal direction on the skin side described in Patent Document 1 and the like, a large amount of urine discharged at a time is temporarily stored in the groove, and this temporarily stored It is known that the absorption speed is increased because urine is absorbed by the absorber while diffusing in the longitudinal direction along the groove.

However, just providing the groove as in Patent Document 1 above, the temporary storage space is only the groove, so that when a large amount of urine is discharged, the urine overflows from the groove and is likely to leak. Increasing the width and length of the groove makes it easier to temporarily store urine, but since the contact area with the skin is reduced, there is a drawback that urine tends to leak through the groove.

In the absorbent article described in Patent Document 2, the density of the upper layer and the lower layer is set to a predetermined density so that the discharged body fluid can quickly pass through the upper layer and reach the surface of the lower layer. When a large amount of urine is discharged at once, there is a risk of leakage through the surface before being absorbed by the absorber.

Therefore, the main problem of the present invention is that in an absorbent article in which concave grooves are formed along the longitudinal direction on the skin side, leakage along the concave grooves is prevented, and even when a large amount of urine is discharged at once, diffusion It is providing the absorbent article which can maintain property and absorption speed.

In order to solve the above problems, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and a groove is formed along the longitudinal direction on the skin side. And in the absorbent article in which the liquid-permeable surface sheet is disposed along the concave groove,
The absorber comprises an upper layer absorber disposed on the skin side and a lower layer absorber disposed on the non-skin side,
The upper layer absorbent body is provided with a slit penetrating the skin side surface and the non-skin side surface in a region including a portion where the concave groove is to be formed.
The lower layer absorber is provided with a mesh-like embossed groove having a continuous mesh-like pattern by embossing from the skin side in a region that is wider than the slit including the slit and does not reach the peripheral edge, and at least the An absorbent article is provided in which a region where the mesh-like embossed groove is provided is a recess recessed from the peripheral edge.

In the first aspect of the present invention, the absorber includes an upper layer absorber disposed on the skin side and a lower layer absorber disposed on the non-skin side. And the upper layer absorber is provided with a slit penetrating the skin side surface and the non-skin side surface in a region including the portion where the concave groove is to be formed, and the lower layer absorber is a region wider than the slit including the slit. In the region that does not reach the peripheral edge, embossing from the skin side is provided with a mesh-like embossed groove of a continuous mesh-like pattern, and at least a concave portion in which the application region of the mesh-like embossed groove is recessed from the peripheral edge portion. Has been. By forming the concave portion in the lower layer absorber, when the upper layer absorber is laminated on the skin side, a hollow portion is formed between the upper layer absorber and the lower layer absorber. This hollow portion is opened toward the side wall of the groove in a state where the groove is formed, and urine can permeate through the liquid-permeable surface sheet from inside the groove. Therefore, since urine that has entered the hollow portion from the concave groove is temporarily stored in the hollow portion, diffusivity and absorption speed can be maintained even when a large amount of urine is discharged at one time. The urine in the hollow portion is diffused by diffusing with the mesh-like embossed groove as a flow path.

In addition, since the hollow portion secures a temporary storage space for urine, the size of the concave groove can be reduced, and problems such as urine leaking back through the concave groove in a supine posture can be prevented. .

Furthermore, even when the slit outer periphery of the upper layer absorber falls on the upper surface of the lower layer absorber, urine diffuses into the hollow portion using the mesh-like embossed groove as a flow path, so that diffusibility and absorption speed can be maintained. Become.

As this invention which concerns on Claim 2, the said ditch | groove is formed by providing the embossing part for ditch | groove in the inside of the said slit and the said recessed part by the embossing from the skin side of the said liquid-permeable surface sheet. An absorbent article according to claim 1 is provided.

The invention according to claim 2 is means for forming the concave groove, and a liquid-permeable topsheet is coated on a laminate of an upper layer absorbent body provided with the slit and a lower layer absorbent body provided with the concave portion. In this state, it is preferable to form by embossing from the skin side of the liquid-permeable surface sheet by providing an embossed portion for a concave groove inside the slit and the concave portion.

According to a third aspect of the present invention, the both side embossed grooves that are continuous with the mesh-like embossed grooves are respectively provided on both sides of the mesh-like embossed grooves along the longitudinal direction of the absorbent article. An absorbent article according to any of the above is provided.

In the invention according to the third aspect, the mesh embossing is provided by providing both side embossing grooves continuous with the mesh embossing groove along the longitudinal direction of the absorbent article on both sides of the mesh embossing groove. Since urine diffused in the width direction along the groove is diffused in the longitudinal direction by the both-side embossed grooves, leakage from both sides in the width direction can be prevented. In addition, the area | region where the said both-sides embossed groove | channel was provided also comprises the recessed part of a lower layer absorber.

As the present invention according to claim 4, the mesh embossing groove has a portion extending obliquely forward or obliquely rearward with respect to the width direction of the absorbent article. A sex article is provided.

In the invention according to claim 4, since the mesh embossed groove has a portion extending obliquely forward or obliquely rearward with respect to the width direction of the absorbent article, the width along the mesh embossed groove. The urine diffused in the direction is prevented from going straight in the width direction, and side leakage is reduced.

According to a fifth aspect of the present invention, the mesh embossed groove is provided in a region wider than the concave groove and extending on both sides of the concave groove. An absorbent article as described in 1 above is provided.

In the invention of claim 5, the urine in the concave groove is easy to flow into the hollow portion through the mesh-like embossed groove, so that the mesh-like embossed groove is a region wider than the concave groove. , And are applied to regions extending on both sides of the groove.

As the present invention according to claim 6, the concave portion is formed so as to be recessed from a peripheral portion by compressing the lower layer absorber in the entire region to which the mesh embossed groove is provided, or the mesh embossed groove. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article according to any one of claims 1 to 5 is formed so as to be recessed from a peripheral edge portion due to depression of a portion surrounded by the mesh-like embossed grooves due to the effect of applying .

The invention described in claim 6 shows two means for forming a recess recessed from a peripheral edge portion in the lower layer absorber. The first one is formed by compressing the lower layer absorbent in the entire region where the mesh-like embossed grooves are provided. The second is an effect when the mesh-like embossed grooves are provided, and is formed when the portion surrounded by the mesh-like embossed grooves is recessed. In order to surely form the recess recessed from the peripheral edge, the first means is more preferable.

As an aspect of the present invention according to claim 7, there is provided the absorbent article according to any one of claims 1 to 6, wherein the length of the concave groove is 50 mm to 100 mm centering on the body fluid discharge portion of the wearer.

In the invention according to claim 7, the length of the concave groove is set to 50 mm to 100 mm with the body fluid discharge part of the wearer as the center. In the present absorbent article, since the urine temporary storage space is secured by the hollow portion formed between the upper layer absorber and the lower layer absorber, the concave grooves used as the urine temporary storage space as in the past are used. There is no need to lengthen the longitudinal dimension, and the length of the groove can be shortened. As a result, it is possible to prevent the contact area between the surface of the absorbent article and the skin surface from being reduced, and to prevent leakage of urine transmitted through the skin.

As the present invention according to claim 8, both side portions of the mesh-like embossed groove are respectively provided with both-side embossed grooves continuous with the mesh-like embossed groove along the longitudinal direction of the absorbent article. By embossing from the skin side of the surface sheet, surface embossed grooves made of curves that swell along the width direction of the absorbent article and bulge outward in the longitudinal direction are given to the longitudinal front and rear portions of the concave grooves, respectively. ,
The absorbent article according to any one of claims 1 to 7, wherein the both-side embossed grooves and the surface embossed grooves are arranged in a substantially annular shape surrounding the recessed grooves.

In the invention described in claim 8, the both-side embossed grooves provided in the lower layer absorber and the surface embossed grooves formed by pressing from the surface side of the liquid-permeable surface sheet are substantially annular surrounding the recessed grooves. When the urine temporarily stored in the hollow part diffuses in the hollow part, it is blocked by the both-side embossed grooves or the surface embossed grooves, and can be prevented from diffusing and leaking outside. Become.

As the present invention according to claim 9, by embossing from the skin side of the liquid-permeable surface sheet, along the longitudinal direction of the longitudinal direction of the concave groove, respectively, along the width direction of the absorbent article, and outward in the longitudinal direction. A surface embossed groove consisting of a bulging curve is given to
The absorbent article according to any one of claims 1 to 8, wherein the mesh embossing groove is not provided in a portion where the surface embossing groove overlaps with a formation region of the mesh embossing groove.

In the invention according to claim 9, when the surface embossed groove is provided, the surface embossed groove is provided on the portion where the surface embossed groove overlaps with the formation region of the mesh embossed groove, and further the surface embossed groove is provided. As a result, the surface embossed grooves are difficult to enter, so that the mesh embossed grooves in this portion are not provided.

As described above in detail, according to the present invention, it is possible to prevent leakage through the groove and maintain diffusivity and absorption speed even when a large amount of urine is discharged at one time.

It is a partially broken developed view of the incontinence pad 1 according to the present invention. It is the II-II arrow directional view of FIG. FIG. 3 is a view taken along the line III-III in FIG. 1. The upper layer absorbent body 4A is shown, (A) is a plan view, and (B) is a view taken along the line BB of (A). The lower layer absorber 4B is shown, (A) is a plan view, and (B) is a view taken along the line BB of (A). 3 is a plan view showing a diffusion state of body fluid in the hollow portion 30. FIG. It is sectional drawing of the absorber 4 which shows the state which 4A of upper layer absorbers fell in the lower layer absorber 4B. (A) to (C) are plan views of the mesh embossed groove 26. FIG. 5 is a plan view of an undesired mesh emboss groove 26. It is a top view of the mesh-like embossed groove | channel 26 which concerns on another form example. (A), (B) is a top view of the absorber 4 which concerns on another form example. This is a first means for providing the mesh embossed grooves 26 to the lower layer absorbent body 4B. This is a second means for providing the mesh embossed groove 26 to the lower layer absorbent body 4B. (A)-(C) are the expanded views of the incontinence pad 1 which shows the other example of the groove 22. (A)-(C) are the expanded views of the incontinence pad 1 which shows the other example of the groove 22. (A)-(F) are the expanded views of the incontinence pad 1 which shows the other example of the groove 22.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic configuration of incontinence pad 1]
As shown in FIGS. 1 to 3, an incontinence pad 1 according to the present invention includes a liquid-impervious back sheet 2 made of a polyethylene sheet and the like, a liquid-permeable front sheet 3 that allows urine to permeate quickly, and the like. Absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between both

sheets

2 and 3, and crepe paper or non-woven fabric surrounding the absorbent body in order to maintain the shape and improve the diffusibility of the absorbent body 4 And the like, and a substantially side edge portion of the absorbent body 4 as an upright base end, and provided at least in a predetermined section in the longitudinal direction so as to include the urine discharge site H. It is mainly composed of a pair of left and right three-dimensional gathers BS, side

nonwoven fabrics

7 and 7 forming the BS, and around the absorbent body 4, the liquid-impervious back sheet 2 and the transparent material are disposed at the longitudinal edges. Liquid surface sheet 3 and The liquid-impervious back sheet 2 and the side nonwoven fabric whose outer edge portions are bonded by an adhesive such as hot melt or an adhesive means such as heat seal, and whose both side edge portions extend laterally from the absorbent body 4. 7 is bonded by an adhesive such as hot melt or an adhesive means such as heat sealing. In addition, a hydrophilic second sheet can be arrange | positioned between the said liquid-permeable surface sheet 3 and the absorber 4 as needed.

Hereinafter, the structure of the incontinence pad 1 will be described in detail.
The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

Next, the liquid-permeable surface sheet 3 is preferably a porous or non-porous nonwoven fabric or a porous plastic sheet. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulkiness and high compression recovery.

The absorbent body 4 is composed of, for example, absorbent fibers such as cotton pulp and a highly water-absorbing polymer, and in the illustrated example, the planar shape is an oblong shape that is long in the longitudinal direction of the pad. The superabsorbent polymer is, for example, granular powder, and is dispersed and mixed in the pulp constituting the absorber 4. The absorber 4 will be described in detail later.

Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. In this incontinence pad 1, since the absorbent body 4 is surrounded by the encapsulating sheet 5, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The excellent encapsulating sheet 5 diffuses urine quickly and prevents the urine from returning. The basis weight of the pulp is 100 g / m ² to 600 g / m ² , preferably 200 g / m ² to 500 g / m ² .

Examples of the superabsorbent polymer include a cross-linked polyacrylate, a self-crosslinked polyacrylate, a saponified acrylate-vinyl acetate copolymer cross-linked, an isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water-absorbing performance can be adjusted in absorption capacity (water-absorbing power) and absorption rate by adjusting the crosslinking density and the crosslinking density gradient.

Further, synthetic fibers may be mixed in the absorber 4. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilizing agent so as to have affinity for urine.

The encapsulating sheet 5 can be a paper material such as tissue or a liquid-permeable sheet such as a nonwoven fabric. In particular, it is preferable to use a nonwoven fabric that does not easily cause destruction (breaking) of materials. As such a nonwoven fabric, a nonwoven fabric processed by a spunbond method and an SMS method excellent in balance between thinness and strength, and an elastic fiber made of a thermoplastic elastomer resin are directly connected to a spinning process such as a spunbond method or a melt blow method. Nonwoven fabrics mainly made of stretchable materials such as nonwoven fabrics, latex, urethane and olefinic fibers processed by the method of forming a web are suitable. In the encapsulating sheet 5, the hydrophilicity of the sheet is not particularly limited as long as at least the skin contact surface side (surface side) of the absorbent body 4 is not water-repellent.

Side

nonwoven fabrics

7 and 7 are provided on both sides of the surface of the incontinence pad 1 along the longitudinal direction and over the entire length of the incontinence pad 1, and the outer portions of the

side nonwoven fabrics

7 and 7 extend laterally. The liquid-impermeable back sheet 2 is laterally extended, and the side nonwoven fabric 7 portion and the liquid-impermeable back sheet 2 portion that are extended to the side are formed by a hot melt adhesive or the like. Joined to form side flaps.

As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing the penetration of urine, etc. or enhancing the feeling of touch, such as SSMS, SMS, and SMMS coated with a silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric, and if emphasis is placed on urine absorbability, a method of polymerizing a compound having a hydrophilic group, such as an oxidation product of polyethylene glycol, in the synthetic fiber production process, Treating with metal salt such as stannic, partially dissolving the surface to make it porous and making the synthetic fiber swell or porous by applying a metal hydroxide, etc., applying capillary action to impart hydrophilicity It is desirable to use a hydrophilic treated nonwoven fabric. As this side nonwoven fabric 7, what was formed by a proper processing method using natural fiber, synthetic fiber, regenerated fiber, etc. as a raw material can be used.

The

side nonwoven fabrics

7 and 7 are appropriately folded, and a pair of left and right inner solid gathers 10 and 10 that stand on the skin side with the position near the side edge of the absorbent body 4 as a standing base end, and the inner side relatively A pair of left and right outer three-dimensional gathers 11 standing on the skin side formed by the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that are located outside the three-dimensional gather 10 and extend laterally from the

absorbent body

4, 11 is a three-dimensional gather BS having a double gather structure. Note that the three-dimensional gather BS may have a single gather structure including only the inner three-dimensional gather 10 or the outer three-dimensional gather 11, or a three-dimensional gather standing up on the skin side simply by disposing the side nonwoven fabric 7. It does not have to be formed into a shape.

The structure of the inner three-dimensional gather 10 and the outer three-dimensional gather 11 will be described in more detail. As shown in FIG. 2, the side nonwoven fabric 7 is folded back on both sides in the width direction toward the back side of the pad. In the illustrated example, one or a plurality of

double sheet portions

7a and 7b are formed on the outer side, and both ends or appropriate positions in the longitudinal direction are fixed inside the double sheet portion 7a on the inner side in the width direction. One or a plurality of thread elastic elastic members 12 are arranged in the double sheet portion 7b on the outer side in the width direction, and two appropriate positions in the longitudinal direction are fixed. On the liquid-permeable surface sheet 3 on which the base end portion of the double sheet portion 7a on the inner side in the width direction is disposed on the side portion of the absorbent body 4. To the side end portion of the liquid-impervious back sheet 2, the base end portion of the double sheet portion 7 b on the outer side in the width direction extending laterally from the absorbent body 4. By bonding with a hot-melt adhesive or the like, the inner solid gathers 10 standing on the skin side are formed by the double sheet portion 7a on the inner side in the width direction, and the skin is formed by the double sheet portion 7b on the outer side in the width direction. An outer three-dimensional gather 11 standing on the side is formed. As shown in FIG. 3, the side nonwoven fabric 7 is not provided with the elastic

elastic members

12 and 13 at both ends in the longitudinal direction of the pad, and the double sheet portion 7a on the inner side in the width direction is hot. It is joined to the absorber 4 side by a melt adhesive or the like.

In the incontinence pad 1, a concave groove 22 for inflow of urine is formed along the longitudinal direction on the skin side. The concave groove 22 receives urine discharged on the surface of the liquid-permeable top sheet 3 and induces urine diffusion in the front-rear direction while guiding urine into the hollow portion 30 described in detail later. By temporarily storing urine in the hollow portion 30, the urine diffusibility and absorption speed are increased and leakage is prevented.

The concave groove 22 is formed by an emboss from the surface side (skin side) of the liquid-permeable surface sheet 3 in the slit 25 of the upper layer absorbent body 4A and the concave portion 27 of the lower layer absorbent body 4B, which will be described in detail later. It is formed by providing the embossing part 21 for concave grooves which squeezes the component member higher than four.

The embossed portion 21 for the concave groove may be an emboss that squeezes the bottom surface of the concave groove 22 over the entire surface, or may be a number of pin-shaped or dot-shaped embosses imparted to the bottom surface of the concave groove 22. When the entire bottom surface is squeezed, it may be an embossing that squeezes the entire bottom surface substantially uniformly, or an emboss having a high-pressure squeezed portion with a predetermined pattern. Although the high pressing portion can be formed in various patterns, as shown in FIG. 1, it is a pattern that repeats unevenness on both sides in the width direction so as to reciprocate both side edges of the concave groove 22 along the concave groove 22. The wavy emboss 22a formed and the linear emboss 22b formed along the concave groove 22 on the side edge opposite to the convex portion where the wavy emboss 22a projects outward in the width direction, The wavy emboss 22a and the linear emboss 22b can be provided separately from each other.

Further, as shown in FIG. 1, the embossing from the skin side of the liquid-permeable surface sheet 3 extends along the pad width direction along the longitudinal direction of the concave groove 22 and outward in the longitudinal direction. In the illustrated example, it is preferable to provide two or more surface embossed grooves 23 each having a bulging curve. The surface embossed groove 23 is provided in a middle portion in the width direction that does not reach both side edges of the absorber 4. The surface embossing groove 23 dams the body fluid diffusing in the absorber 4 to prevent leakage from the front and rear end portions of the absorber 4, and dams the body fluid flowing on the pad surface to flow into the emboss. 4 for absorbing and holding.
[About absorber 4]
Hereinafter, the absorber 4 will be described in detail. As shown in FIG. 2 and FIG. 3, the absorbent body 4 includes an upper layer absorbent body 4 A disposed on the skin side (liquid-permeable surface sheet 3 side) and a non-skin side (liquid-impermeable back sheet 2 side). And a lower layer absorbent body 4B disposed in (2).

As shown in FIG. 4, the upper layer absorbent body 4 A is provided with a slit 25 penetrating the skin side surface and the non-skin side surface in a region including a portion where the concave groove 22 is to be formed. The region including the portion where the concave groove 22 is to be formed is a region including an application region of the concave groove embossed portion 21 when the concave groove 22 is formed, and has a larger area than the concave groove embossed portion 21. It refers to the area that it has.

The slit 25 is an opening penetrating the upper absorbent body 4A in the thickness direction, and is a portion where members (pulp and polymer) constituting the upper absorbent body 4A are not interposed. The slit 25 is formed in a substantially rectangular shape elongated in the longitudinal direction of the pad. When the upper layer absorbent body 4A is manufactured, the slit 25 may be formed by not depositing pulp or polymer in the slit 25, or may be formed by performing an opening process on the slit 25 portion. .

As shown in FIG. 5, the lower layer absorbent body 4B includes the slit 25 of the upper layer absorbent body 4A when the upper layer absorbent body 4A is laminated on the skin side (overlaps with the slit 25 in the thickness direction). A mesh-like embossed groove 26 having a continuous mesh-like pattern is provided by embossing from the skin side in an intermediate area that is wider than the slit 25 and does not reach the periphery of the lower layer absorbent body 4B, and at least the above-mentioned A region where the mesh embossing groove 26 is provided is a recess 27 which is recessed from the peripheral edge where the mesh embossing groove 26 is not provided.

Further, the lower layer absorbent body 4B has a leveling embossed portion 29 for leveling the mesh embossed groove 26 in a region including a portion where the concave groove 22 is to be formed, and is long in the center in the pad width direction. It is preferable to apply along the direction. The leveling embossed portion 29 is provided to facilitate the provision of the recessed groove embossed portion 21 on the bottom surface of the recessed portion 27 when the recessed groove 22 is formed.

As shown in FIG. 2, the upper layer absorbent body 4 A is laminated on the skin side of the lower layer absorbent body 4 B by forming a concave portion 27 that is recessed from the peripheral edge of the lower layer absorbent body 4 B. The hollow part 30 comes to be formed between 4A and the lower layer absorber 4B. The hollow portion 30 is surrounded by the peripheral edge of the lower layer absorber 4B, and the upper center portion communicates with the slit 25 formed in the upper layer absorber 4A. In the state where the concave groove 22 is formed, the hollow portion 30 opens toward the side wall of the concave groove 22, and the urine in the concave groove 22 permeates the liquid-permeable surface sheet 3. It is possible to enter.

Therefore, the urine in the concave groove 22 permeates the liquid-permeable surface sheet 3 and enters the hollow portion 30, and as shown in FIG. 6, the urine in the hollow portion 30 extends along the mesh embossed groove 26. Is temporarily stored in the hollow portion 30. For this reason, even when a large amount of urine is discharged at one time, urine can be temporarily stored in the hollow portion 30, so that diffusibility and absorption speed can be maintained.

In addition, since the urine temporary storage space is secured by the hollow portion 30, it is not necessary to use the groove as a urine temporary storage space as in the conventional absorbent article, the longitudinal dimension of the groove 22 can be reduced, It is possible to prevent problems such as urine leaking through the concave groove 22 when lying on the back.

By the way, as shown in FIG. 7, the outer peripheral portion of the slit 25 of the upper absorbent body 4 A is formed as a lower layer by providing the groove embossed portion 21 for forming the groove 22 or by pressure during use. There is a case where it falls on the upper surface of the absorber 4B. Even in such a case, in the incontinence pad 1, since the mesh-like embossed groove 26 is continuously provided on the bottom surface of the concave portion 27, urine passes through the hollow portion 30 using the mesh-like embossed groove 26 as a flow path. Can spread.

As shown in FIG. 5, the lower layer absorbent body 4 B is provided with both-side embossed grooves 28 that are continuous with the mesh-like embossed grooves 26 along the longitudinal direction of the pad, on both sides of the mesh-like embossed grooves 26. Is desirable. The both-side embossed grooves 28 are provided over substantially the entire length of the area where the mesh-like embossed grooves 26 are provided, and both ends in the longitudinal direction are formed slightly shorter than the areas where the mesh-like embossed grooves 26 are provided. The embossed grooves 28 on both sides are preferably straight along the longitudinal direction of the pad, but can also be formed by curves or wavy lines that bulge outward in the width direction. However, it is desirable that the mesh-like embossed groove 26 does not extend outward in the width direction from the both-side embossed grooves 28. It is preferable that the application region of the both-side embossed groove 28 constitutes a part of the concave portion 27. That is, the concave groove 27 is formed continuously to the application area of the mesh embossed groove 26 and the both side embossed grooves 28. The embossed grooves 28 on both sides constitute the side wall of the recess 27 (hollow part 30).

The groove width of the embossed grooves 28 on both sides is preferably formed to be equal to or greater than the groove width of the mesh embossed grooves 26. Specifically, the groove width of the mesh embossed groove 26 is 1 to 5 times, preferably about 1.5 to 3 times. Further, the depth of the embossed grooves 28 on both sides is preferably formed substantially equal to the depth of the mesh-like embossed grooves 26.

By providing the both-side embossed grooves 28, urine diffused in the width direction along the mesh-like embossed grooves 26 is blocked by the side walls of the hollow portion 30 formed by providing the both-side embossed grooves 28. Since the flow changes in the longitudinal direction of the pad along the embossed grooves 28 on both sides, diffusion in the width direction where the distance to the absorber end is short is surely suppressed, and side leakage of urine can be prevented.

The mesh-like embossed groove 26 is formed at an intermediate portion from the periphery of the lower layer absorber 4B to an inner position spaced by a predetermined distance so as not to reach the periphery of the lower layer absorber 4B. Embossing is not given to the peripheral part of lower layer absorber 4B, and it is formed higher on the skin side than the application area (concave part 27) of mesh embossing groove 26.

The mesh embossed grooves 26 are preferably formed in a mesh pattern having portions extending obliquely forward or obliquely rearward with respect to the pad width direction. As a result, it is possible to suppress the urine flowing along the mesh embossed grooves 26 from being linearly diffused in the width direction, and as shown in FIG. 6, the urine is diffused along the zigzag flow path. Rapid diffusion into the water is suppressed and side leakage can be prevented.

As such a mesh pattern, as shown in FIG. 8, (A) an oblique lattice pattern, (B) a flat hexagonal honeycomb pattern having a side parallel to the pad front-rear direction and being long in the pad front-rear direction, ( C) A regular hexagonal honeycomb pattern having sides parallel to the pad width direction can be formed.

On the other hand, an unfavorable pattern as the mesh embossed groove 26 is a regular lattice pattern in which straight lines extending in the pad width direction are arranged on a straight line, as shown in FIG. In this regular lattice pattern, since urine goes straight along a straight line extending in the pad width direction and diffuses rapidly in the width direction, there is a high risk of causing side leakage.

Further, it is preferable that the mesh embossed groove 26 is provided in a region wider than the concave groove 22 and extending on both sides of the concave groove 22. Accordingly, urine can easily flow from the concave groove 22 into the hollow portion 27 using the mesh-like embossed groove 26 as a flow path. The range in the pad width direction in which the mesh embossed grooves 26 are formed is preferably three times or more the groove width of the recessed grooves 22. As shown in the drawing, the mesh-like embossed grooves 26 are preferably provided in regions that are longer in the pad longitudinal direction than the recessed grooves 22 and extend in front and rear of the recessed grooves 22, respectively.

The two embossed grooves 28 may be provided on each side of the mesh embossed groove 26 as shown in FIG. 8, or on both sides of the meshed embossed groove 26 as shown in FIG. A plurality of pads may be provided at intervals in the pad width direction. In the example shown in FIG. 10, three

embossed grooves

28, 28... Are provided on both sides. Even when a plurality of the both-side embossed grooves 28 are provided, the application region of the two-sided

embossed grooves

28, 28... Constitutes a part of the recess 27 formed in the application region of the mesh-like embossed groove 26. By providing a plurality of the embossed grooves 28 on both sides, the effect of blocking the urine diffused in the width direction is increased, and the lateral leakage of urine can be more reliably prevented. The plurality of embossed grooves on both

sides

28, 28... May all have the same groove width or may be formed with different groove widths. When forming with different groove widths, it is preferable to make the outermost embossed groove 28 wider than the inner one as shown in the example. It is also possible to gradually increase the width of the groove on the outer side in the width direction from that on the inner side. Thereby, the damming effect of urine diffused outward in the width direction is further improved.

As shown in FIG. 1, it is preferable that the mesh-like embossed grooves 26 and the both-side embossed grooves 28 are provided up to the vicinity of the surface embossed grooves 23 respectively arranged in the longitudinal direction of the concave groove 22. As a result, the surface embossed groove 23 is positioned at the end in the longitudinal direction of the recess 27 formed in the application region of the mesh embossed groove 26 and the embossed grooves 28 on both sides. It is possible to reliably suppress the occurrence of front and rear leakage due to diffusion.

As shown in FIG. 1, when two surface embossed grooves 23 are arranged at the front and rear portions of the recessed groove 22, respectively, the mesh embossed grooves 26 and the side embossed grooves 28 are as shown in FIG. In addition, it may be provided in the inner

surface embossing grooves

23, 23, or may be provided in the outer

surface embossing grooves

23, 23 beyond the inner surface embossing groove 23, as shown in FIG. 11. . Although not shown, one of the front and rear sides may be in the inner surface embossing groove 23 and the other may be in the outer surface embossing groove 23. In addition, FIG. 11 shows the mesh embossed grooves 26 and both-side embossed grooves 28 applied to the absorbent body 4, the recessed groove embossed portions 21 and the surface embossed grooves 23 applied from the skin side of the liquid-permeable surface sheet 3. It is a top view of the absorber 4 which shows the relative positional relationship of these.

The both-side embossed grooves 28 and the surface embossed grooves 23 are preferably arranged in a substantially annular shape surrounding the recessed grooves 22 as shown in FIGS. The term “substantially annular” refers to a state in which the both side embossed grooves 28 and the surface embossed grooves 23 are slightly spaced apart from each other, but are arranged so as to substantially surround the recessed grooves 22. Thereby, when the urine temporarily stored in the hollow portion 30 diffuses in the hollow portion 30, both side ends are dammed by the both-side embossed grooves 28 and front and rear ends are dammed by the surface embossed grooves 23. It becomes possible to prevent the occurrence of side leakage and front / rear leakage by spreading outward.

Further, as shown in FIG. 11, when the mesh embossing groove 26 and the both side embossing grooves 28 are provided in the outer

surface embossing grooves

23, 23 beyond the inner surface embossing groove 23, In the inner surface embossing groove 23 overlapping the formation region, the mesh embossing groove 26 may be continuously provided so as to overlap the surface embossing groove 23 as shown in FIG. As shown in FIG. 11B, the mesh-like embossed grooves 26 may not be provided and may be discontinuous. In the former case, the mesh embossed groove 26 is continuously formed even in the surface embossed groove 23 portion, so that the urine diffusibility can be maintained. In the latter case, the surface embossed groove 23 is the mesh embossed groove. If the surface embossing groove 23 is further provided in addition to the network-like embossing groove 26 in the portion overlapping with the formation region 26, the problem that the surface embossing groove 23 becomes difficult to enter can be solved. In the latter form in which the mesh-like embossed groove 26 is not provided in the portion overlapping the surface embossed groove 23, the mesh-like embossed groove 26 in the central portion in the width direction overlapping the surface embossed groove 23 is discontinuous. The mesh-like embossed grooves 26 or the both-side embossed grooves 28 are made continuous at both sides in the width direction, thereby providing an effect that does not hinder urine diffusion. From the viewpoint of suppressing the diffusion of urine by the surface embossed groove 23, the latter is more preferable.

As shown in FIG. 1, the mesh-like embossed grooves 26 and the both-side embossed grooves 28 are preferably provided on the inner side in the width direction from the

side nonwoven fabrics

7 and 7 arranged along the longitudinal direction on both sides of the pad surface. . Thereby, it can prevent that the side end of the hollow part 30 approaches the side edge of the absorber 4 too much, and the bodily fluid temporarily stored in the hollow part 30 leaks from the side edge of the absorber 4.

Next, on the basis of FIG. 12 and FIG. 13, a description will be given of means for making the application region of the mesh-like embossed groove 26 and the both-side embossed grooves 28 into a recessed part 27 recessed from the peripheral part. As a first means, as shown in FIG. 12, it has high-pressure squeezing

convex portions

31a and 31b corresponding to the mesh embossed grooves 26 and the both-side embossed grooves 28, and between these high-pressure squeezed

convex portions

31a and 31b. By compressing the lower layer absorbent body 4B in the entire region to which the mesh embossed groove 26 and both side embossed grooves 28 are provided by the embossing roll 31 having the low pressure squeezing convex part 31c for squeezing the absorbent body, it is depressed from the peripheral part. A recessed portion 27 can be formed.

As a second means, as shown in FIG. 13, the mesh-like embossed groove 26 and the both-side embossed grooves are provided by the embossing roll 32 having

convex portions

32 a and 32 b corresponding to the mesh-like embossed groove 26 and the both-side embossed grooves 28. When the fibers in the portion surrounded by the mesh embossing groove 26 or the portion surrounded by the both-side embossing groove 28 and the mesh embossing groove 26 are pulled and recessed due to the influence of the application of the belt 28, A concave portion 27 that is recessed from the portion can be formed. In order to reliably form the recess 27 that is recessed from the peripheral edge, it is more preferable to use the first means.

The upper layer absorber 4A and the lower layer absorber 4B can be formed with substantially the same plane dimensions as shown in FIGS. Thereby, the upper layer absorbent body 4A is laminated on the upper surface of the peripheral edge portion formed relatively higher on the skin side of the lower layer absorbent body 4B, and a hollow portion is formed between the upper layer absorbent body 4A and the lower layer absorbent body 4B by the concave portion 27. 30 is formed. The upper layer absorber 4A may be formed in a larger planar shape than the lower layer absorber 4B, or may be formed in a smaller planar shape. In the case of a small planar shape, the planar shape is larger than the concave portion 27 formed in the lower layer absorber 4B so that the upper layer absorber 4A is laminated on the peripheral edge of the lower layer absorber 4B, and the space 30 is reliably It is preferable to be formed in the following manner. Moreover, although the thickness of the said upper layer absorber 4A and the lower layer absorber 4B may be formed equally, and may differ, the lower layer absorber 4B is made relatively from the relationship which provides the recessed part 27 in the lower layer absorber 4B. It is preferable to form it thickly.

Next, the dimensions of each part will be described. As shown in FIG. 1, the length L of the concave groove 22 is 50 mm to 100 mm, preferably 60 mm to 80 mm, centering on the urine discharge site H of the wearer. Good. In the incontinence pad 1, as described above, the hollow portion 30 acts as a temporary storage space for urine and it is not necessary to store urine in the concave groove 22. Can be shorter than the one. The concave groove 22 is formed with an equal length in the front-rear direction around the urine discharge site H. When the product length of the incontinence pad 1 assuming urge incontinence is 290 mm to 360 mm, the position of the urine discharge site H is preferably about 100 mm to 160 mm from the front end of the absorbent body 4.

Further, the distance DL from the front and rear end edges of the absorber 4 to the front and rear end portions of the mesh embossed groove 26 is preferably 10 mm or more. The distance DW from the side edge of the absorber 4 to the embossed grooves 28 on both sides is preferably 10 mm to 30 mm.

In order to manufacture the incontinence pad 1 having the above-described configuration, the upper layer absorbent body 4A provided with the slits 25, the mesh embossed groove 26, the both side embossed grooves 28, and the lower layer provided with the leveled embossed portion 29 as necessary. After the absorbent body 4 laminated with the absorbent body 4B is surrounded by the encapsulating sheet 5, the absorbent body 4B is placed on the upper surface of the liquid-impermeable back sheet 2, and the

side nonwoven fabrics

7, 7 are bonded to both sides of the upper surface. Cover with the liquid surface sheet 3. By embossing from the surface side of the liquid-permeable surface sheet 3, the embossed portion 21 for concave grooves is provided inside the slits 25 of the upper layer absorbent body 4A and the concave portions 27 of the lower layer absorbent body 4B, and the surface embossed

grooves

23 , 23... Then, it cuts along the outline of a product, and manufacture of incontinence pad 1 is completed.

[Other examples]
The concave groove 22 can be arranged in various forms. As shown in FIG. 1, the concave groove 22 is preferably formed in the middle part of the longitudinal direction in the center part in the pad width direction corresponding to the urine discharge site H, but only one line is formed in FIG. As shown in A) and (B), a plurality of strips may be formed apart in the pad width direction, or as shown in FIG. You may form in a shape. When a plurality of strips are formed, the urine diffusion effect can be more reliably enhanced even when a large amount of urine is discharged at once. Moreover, when it forms in a discontinuous line shape, the crushing when the ditch | groove 22 receives external forces, such as leg pressure, from the width direction both sides can be prevented more reliably. When a plurality of strips are formed apart in the pad width direction, the even strips shown in FIG. 14 (A) or the odd strips shown in FIG. 14 (B) may be used.

Further, the planar shape of the concave groove 22 may be formed with a uniform width along the longitudinal direction of the pad as shown in FIG. 1, or may be formed with different groove widths as shown in FIG. Also good. In FIG. 15A, a widened portion 22a having an enlarged groove width is provided at the front end portion of the concave groove 22 in the pad longitudinal direction. By providing the widened portion 22a, a temporary storage space for urine can be expanded, and even when a large amount of urine is dripped at a time such as urge incontinence, the urine can be reliably received by the groove 22 It becomes. The widened portion 22a may be provided at the end portion on the rear side of the pad as shown in FIG. 15B, or may be provided at the front and rear end portions as shown in FIG. 15C.

The concave groove 22 may be provided with one or a plurality of

branch portions

22b and 22c as shown in FIG. By providing the

branch portions

22b and 22c, the urine temporarily stored in the concave groove 22 is diffused along the concave groove 22 to a wide area of the absorbent body 4, and the urine is spread over a wider area of the absorbent body 4. Can absorb. In the example shown in FIGS. 16A to 16C, the branching portion 22b extends outward from both side edges of the groove 22 on the front side, the rear side, or the front side and the rear side in the pad longitudinal direction, There are provided a plurality of inclining toward the end in the longitudinal direction of the pad, three each on the left and right in the illustrated example. In the example shown in FIGS. 16D to 16F, as the branching portion 22c, a plurality of concave grooves 22 are radially formed on the front end, the rear end, or the front end and the rear end in the longitudinal direction of the pad. In the example shown, the one that is branched into five is provided.

DESCRIPTION OF SYMBOLS 1 ... Incontinence pad, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 4A ... Upper layer absorber, 4B ... Lower layer absorber, 5 ... Encapsulated sheet, 7 ... Side nonwoven fabric, DESCRIPTION OF SYMBOLS 10 ... Inner three-dimensional gather, 11 ... Outer three-dimensional gather, 12.13 ... Thread-like elastic elastic member, 21 ... Embossed part for concave groove, 22 ... Concave groove, 23 ... Surface embossed groove, 25 ... Slit, 26 ... Mesh-like embossed groove , 27 ... concave part, 28 ... embossed groove on both sides, 30 ... hollow part

Claims

An absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, a groove is formed along the longitudinal direction on the skin side, and the liquid-permeable surface sheet is disposed along the groove. In the absorbent article made,
The absorber comprises an upper layer absorber disposed on the skin side and a lower layer absorber disposed on the non-skin side,
The upper layer absorbent body is provided with a slit penetrating the skin side surface and the non-skin side surface in a region including a portion where the concave groove is to be formed.
The lower layer absorber is provided with a mesh-like embossed groove having a continuous mesh-like pattern by embossing from the skin side in a region that is wider than the slit including the slit and does not reach the peripheral edge, and at least the An absorbent article, wherein a region where the mesh-like embossed groove is provided is a recess recessed from the peripheral edge.
The absorbent article according to claim 1, wherein the concave groove is formed by embossing a concave groove inside the slit and the concave portion by embossing from the skin side of the liquid-permeable surface sheet.
Both side embossed grooves continuous with the mesh-like embossed grooves are provided along the longitudinal direction of the absorbent article on both sides of the mesh-like embossed grooves, respectively, and the both-side embossed groove application regions are part of the recesses. The absorptive article according to claim 1 or 2 which constitutes.
The absorbent article according to any one of claims 1 to 3, wherein the mesh embossed groove has a portion extending obliquely forward or obliquely rearward with respect to the width direction of the absorbent article.
The absorbent article according to any one of claims 1 to 4, wherein the mesh-like embossed grooves are provided in regions that are wider than the concave grooves and extend on both sides of the concave grooves.
The concave portion is formed so as to be recessed from a peripheral portion by compressing the lower layer absorber in the entire region to which the mesh embossing groove is provided, or by the influence when the mesh embossing groove is provided, The absorbent article according to any one of claims 1 to 5, wherein a part surrounded by the mesh-like embossed grooves is recessed so as to be recessed from the peripheral edge.
The absorbent article according to any one of claims 1 to 6, wherein a length of the concave groove is 50 mm to 100 mm centering on a body fluid discharge portion of the wearer.
By embossing from the skin side of the liquid-permeable surface sheet, both side embossed grooves that are continuous with the mesh-shaped embossed grooves are respectively provided along the longitudinal direction of the absorbent article on both sides of the mesh-shaped embossed grooves. In addition, along the longitudinal direction of the concave groove, a surface embossed groove is provided that is formed along a width direction of the absorbent article and bulges outward in the longitudinal direction.
The absorbent article according to any one of claims 1 to 7, wherein the both-side embossed grooves and the surface embossed grooves are arranged in a substantially annular shape surrounding the recessed grooves.
By embossing from the skin side of the liquid-permeable surface sheet, surface embossing consisting of a curve that swells outward in the longitudinal direction along the longitudinal direction of the absorbent article, respectively, in the longitudinal direction of the concave groove Grooves are added,
The absorbent article according to any one of claims 1 to 8, wherein the mesh embossing groove is not provided in a portion where the surface embossing groove overlaps with a formation region of the mesh embossing groove.