WO2011142272A1

WO2011142272A1 - Disposable absorbent article

Info

Publication number: WO2011142272A1
Application number: PCT/JP2011/060391
Authority: WO
Inventors: 敬大溝渕; 美帆毛利
Original assignee: 大王製紙株式会社
Priority date: 2010-05-10
Filing date: 2011-04-28
Publication date: 2011-11-17
Also published as: JP2011234896A; JP5543268B2

Abstract

Provided is a disposable absorbent article that absorbs excreta of high viscosity such as watery stool quickly without losing the ability to absorb excreta of low viscosity. The surface sheet (30) is made of nonwoven fabric that comprises multiple depressions and protrusions (31) and (32) on the surface that contacts the skin and wherein fiber density increases towards the bottom of the depressions (31). The intermediate sheet (40) is made of nonwoven fabric and the absorbing element (50) has multiple depressions and protrusions (51) and (52) on the surface and fiber density increases towards the bottom of the depressions (51). The sheets are disposed so that protrusions (32) of the surface sheet (30) overlay depressions (51) of the absorbing element (50). The bottoms of the depressions (31) of the surface sheet (30) and the intermediate sheet (40), and the intermediate sheet (40) and the tops of the protrusions (52) of the absorbing element (50) are respectively bonded. Spaces (53) are formed between the back surface of the intermediate sheet (40) and the bottoms of the depressions (51) of the absorbing element (50).

Description

Disposable absorbent article

The present invention relates to a disposable absorbent article such as a disposable diaper.

Disposable absorbent articles are required not only to prevent leakage of excrement such as urine, but also to prevent discomfort and rash caused by excretion of excrement such as urine on the skin. As such a surface sheet, for example, those having unevenness on the skin side surface as shown in Patent Documents 1 and 2 to reduce the contact area of the skin can be mentioned.
Patent Document 1 discloses a configuration that ensures the air permeability of the topsheet by defining the amount of air permeation in the horizontal direction of the topsheet with unevenness on the skin side surface. Moreover, in patent document 2, the thickness and fiber density of a convex part and a recessed part on a surface sheet are prescribed | regulated, and it is set as the structure which the movement of the water | moisture content from a convex part to a recessed part is performed quickly.

Japanese Patent No. 3587831 Japanese Patent No. 3611838

However, by providing unevenness only on the surface sheet, particularly for excrement having a high viscosity such as watery stool, it can be efficiently absorbed by staying in the recess of the surface sheet or collecting between the surface sheet and the absorbent element. There was a problem that it could not be transferred to the element, and the absorption rate was slow, it was easy to reverse, or the liquid flow distance on the surface was long, leading to leakage.
Moreover, even if the absorption performance of high-viscosity excrement is improved, it is meaningless if the absorption performance of low-viscosity excrement is reduced.
Then, the main subject of this invention is providing the disposable absorbent article which transfers a high-viscosity excrement to an absorption element quickly, without impairing the absorption performance of a low-viscosity excrement.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable surface sheet and a liquid-impermeable sheet, an absorbent element including a fiber assembly interposed therebetween, and an intermediate sheet interposed between the surface sheet and the absorbent element. In disposable absorbent articles,
The surface sheet is formed by arranging a large number of recesses on the skin contact side surface at intervals, so that the portion between the bottoms of the recesses is a relatively raised projection, and the fibers are closer to the bottom of the recesses. Made of non-woven fabric with high density,
The intermediate sheet is made of nonwoven fabric,
The absorbent element has a large number of concave portions arranged on the surface at intervals, so that the portion between the bottom portions of the concave portions is a convex portion that is relatively raised, and the fiber density increases as the bottom portion of the concave portion is approached. And
Each convex portion of the topsheet is disposed so that at least a portion thereof overlaps at least one concave portion of the absorbent element,
At least the bottom of the recess in the top sheet and the intermediate sheet, and the intermediate sheet and at least the top of the projection in the absorbent element are joined, respectively, and the back surface of the intermediate sheet and at least the recess in the absorbent element A space is formed between the bottom,
A disposable absorbent article characterized by that.

(Function and effect)
Experiments have shown that the disposable absorbent article of the present invention can quickly absorb even high-viscosity excrement such as watery stool. The reason for this is not clear, but it is presumed that the absorption is generally performed on the following principle. That is, in the initial stage of absorption, a large amount of excrement exists on the surface sheet or is supplied one after another, so the excrement sequentially permeates through both sides regardless of the concave or convex portions of the surface sheet. It will be delivered to the sheet. In such a state, if there is no unevenness on the surface of the absorbent element and almost no gap is formed between the back surface of the intermediate sheet and the excrement from the top sheet to the intermediate sheet, the intermediate sheet is transferred to the absorbent element. The delivery of excrement cannot catch up, and this becomes a bottleneck, and the excrement cannot move quickly to the absorbent element side. On the other hand, when a large number of recesses are provided on the surface of the absorbent element as described above, and a space is formed between the bottom of the recesses and the back surface of the intermediate sheet, a large amount and one after another from the top sheet to the intermediate sheet. When excretion delivered to the absorption element is delivered to the absorption element, the portion that the absorption of the absorption element cannot catch up is temporarily stored in the space, and can be sequentially delivered from this space to the absorption element ( In other words, the excrement can be promptly moved to the absorption element in combination with the increase in the excretion receiving surface area of the absorption element due to the recess.

When excretion on the surface sheet is completed and absorption proceeds to a certain extent, movement of excrement from the surface sheet side to the absorption element side is caused by movement from a high place to a low place by gravity (for example, a recessed portion in a recessed portion). The effect of capillary action in the nonwoven fabric, liquid transfer from the nonwoven fabric surface to the nonwoven fabric surface, or from fiber to fiber becomes strong. Even in such a state, in the present invention, after excrement on the top sheet moves to the bottom of the recess due to gravity and capillary action, it is joined to the bottom of the recess from the bottom of the recess or the surrounding back surface. It is transferred to the intermediate sheet and moved to the back side of the intermediate sheet as it is, and transferred from the part to the top of the convex part of the absorbent element joined to the part, thereby moving quickly to the absorbent element. Can do.

Furthermore, in any of these absorption forms, excrement that has moved to the absorption element is moved to the back of the absorption element by capillary action due to a fiber density gradient toward the bottom of the recess, while being moved by gravity in the absorption element. And pulled in and held.

And, it is presumed that the excrement having high viscosity such as watery feces can be quickly moved to the absorption element by the smooth movement of excrement throughout the absorption process. In addition, since the excrement moving action is not of a property that impedes the absorption performance of the low-viscosity excretory parts such as urine, the absorption performance of the low-viscosity excrement is not impaired, It is presumed that the absorption performance was improved. Furthermore, it goes without saying that, as in the prior art, due to the unevenness of the topsheet, excrement attached to the topsheet or the topsheet itself can prevent discomfort or rash due to the skin being attached to the skin.

In the present invention, the concave portion and the convex portion of the surface sheet indicate irregularities viewed from the skin contact side.

<Invention of Claim 2>
The area ratio of the recesses on the surface of the surface sheet is 10 to 20%, the area ratio of the recesses on the surface of the absorbent element is 20 to 30%, and the depth of the recesses of the absorbent element is 1 to 3 mm. The disposable absorbent article according to claim 1.

(Function and effect)
When the area ratio of the recesses on the surface of the surface sheet, the area ratio of the recesses on the surface of the absorbent element, and the depth of the recesses of the absorbent element are within such ranges, the excrement moving action of the present invention described above is exhibited. This is advantageous.

<Invention of Claim 3>
The concave portions of the topsheet are a large number of dot-shaped concave portions having a diameter of 0.5 to 2.0 mm arranged in a dotted pattern, and the concave portions of the absorbent element are spaced apart from each other by a larger distance than the diameter of the dot-shaped concave portions. The disposable absorbent article according to claim 2, which is a groove-like recess having a width of 0.6 to 2.5 mm and arranged in a lattice.

(Function and effect)
When the concave portion of the surface sheet has such a dot pattern, liquid flow on the surface is prevented while preventing discomfort or rash caused by the excrement adhering to the surface sheet or the surface sheet itself adhering to the skin. Can be suppressed. Moreover, since the space formed between the absorbent element and the intermediate sheet extends along the surface of the absorbent element when the concave portions of the absorbent element have such a lattice pattern, the absorbent element and the intermediate sheet Since the excrement reached in the middle is transferred to the absorption element while diffusing along the surface of the absorption element, the excretion is efficiently transferred to the absorption element, and the absorption rate and the effect of preventing reversion are further improved. Become. Furthermore, since the lattice spacing of the recesses of the absorbent element is larger than the diameter of the dot-like recesses of the topsheet, regardless of the arrangement of the topsheet recesses and the absorbent element recesses (e.g. ) Each convex part of the topsheet is arranged so that at least a part thereof overlaps at least one concave part of the absorbent element. In addition, the diameter of a dot-shaped recessed part means a long diameter (length of the longest part), when the shape of a dot-shaped recessed part is other than a circle.

<Invention of Claim 4>
The non-woven fabric of the surface sheet is a hydrophilic air-through non-woven fabric having a synthetic fiber having a fineness of 1.5 to 3.3 dtex as a raw fiber, a thickness of 0.2 to 0.8 mm, and a basis weight of 15 to 25 g / m ² .
The non-woven fabric of the intermediate sheet is made of synthetic fiber having a fineness of 1.7 to 5.0 dtex as a raw material fiber, and has a thickness of 0.1 to 0.5 mm and a basis weight of 18 to 30 g / m ^2. It is a hydrophilic air-through nonwoven fabric with high density,
The absorbent element is formed by wrapping a laminated body obtained by mixing and superimposing superabsorbent polymer particles and pulp with a packaging sheet made of crepe paper, and the basis weight of the superabsorbent polymer particles is 50 to 350 g / m ^2. The basis weight of the pulp is 100 to 300 g / m ² , and the basis weight of the crepe paper is 5 to 40 g / m ² ;
The superabsorbent polymer particles have a water absorption amount specified by JIS K 7223-1996 of 40 g / g or more and a water absorption rate specified by JIS K 7224-1996 of 35 g / g / s or less.
The disposable absorbent article according to any one of claims 1 to 3.

(Function and effect)
When each member of the present invention is made of such a material, it is extremely advantageous for exerting the excrement moving action of the present invention described above, such as facilitating the transfer of excrement from the top sheet to the absorbent element. .

As described above, according to the present invention, the high-viscosity excrement can be quickly transferred to the absorption element without losing the absorption performance of the low-viscosity excrement while having the advantage of the surface sheet provided with unevenness on the skin contact surface. And so on.

It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. FIG. 8 is a sectional view taken along line 8-8 in FIG. FIG. 9 is a sectional view taken along line 9-9 in FIG. It is a top view which shows a surface sheet, an intermediate sheet, and an absorption element. It is a principal part expanded sectional view which shows a surface sheet, an intermediate sheet, and an absorption element. It is a cross-sectional photograph of the joined surface sheet 30 and intermediate sheet 40. It is a principal part enlarged plan view which shows the pattern of the recessed part of various absorption elements. It is a principal part enlarged plan view which shows a surface sheet and an intermediate sheet. It is a principal part expanded sectional view which shows a surface sheet, an intermediate sheet, and an absorption element.

Hereinafter, embodiments of the present invention will be described with reference to an example of a tape-type disposable diaper. However, it is needless to say that the present invention can be applied to other types of disposable diapers such as a pants type. In the following description, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) perpendicular to the front-rear direction. "Vertical direction" means the wearing state of the diaper, that is, the width when the diaper is folded in two at the crotch so that the both sides of the diaper and the back part of the diaper overlap each other It means the direction orthogonal to the direction.

1 to 8 show an example of a tape-type disposable diaper. This tape-type disposable diaper is a part that extends from the lower abdomen through the crotch part to cover the buttocks along the center in the width direction, and a liquid-permeable surface sheet that forms the body-side surface, and the outer surface side An absorbent main body 10 that is a part where the absorbent element 50 is interposed between the liquid-impermeable sheet located in the liquid-impervious sheet, and a part that extends to the front side and the rear side of the absorbent main body part 10 respectively, and It has a ventral end flap part FE and a dorsal end flap part BE, which are parts that do not have the absorbent element 50.

Further, this tape-type disposable diaper has a pair of abdominal side flap portions FF, FF extending to the outside in the width direction from the crotch portion C on both sides of the upper edge side portion of the abdominal side F, and On both sides of the edge portion, a pair of back side flap portions BF, BF extending to the outside in the width direction from the crotch portion C are provided. Moreover, the fastening tape 13 as a locking member is provided in the back side flap part BF and BF, respectively.

More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions BF and FF on the back side and the abdomen side is formed by the exterior sheet 12. In particular, in the absorbent main body 10, a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and an absorbent element is further disposed on the inner surface side of the liquid-impermeable sheet 11. 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have a slightly larger dimension in the front-rear direction and the width direction than the absorbent element 50, and are eaten from the side edges of the absorbent element 50 in the top sheet 30. The peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. The liquid-impermeable sheet 11 is made of a moisture-permeable polyethylene film or the like, and is formed to be slightly wider than the top sheet 30.

Further, side barrier cuffs 60, 60 projecting (standing) on the skin side of the wearer are provided on both sides of the absorbent main body 10, and a barrier sheet forming the side barrier cuffs 60, 60 is provided. 62 and 62 are extended over the whole width direction outer side of the absorptive main-body part 10 including the inner surface of each side flap part BF and FF of back side and abdominal side.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Exterior sheet)
The exterior sheet 12 is a part that supports the absorbent element 50 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part into which the wearer's leg is placed.

The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the fiber basis weight is desirably 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics). Of course, in addition to this, a liquid-impermeable and moisture-permeable material that has been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

(Surface sheet)
As the top sheet 30, a non-woven fabric is used. It is more preferable to use a non-porous nonwoven fabric. The raw material fibers of the nonwoven fabric are not particularly limited, but it is preferable to use synthetic fibers capable of heat embossing such as olefins such as polyethylene and polypropylene, polyesters, and polyamides. Furthermore, as a method for processing the nonwoven fabric, any known method such as a spun lace method, a spun bond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method and the like can be used. The use of the air-through method having bulkiness is particularly preferred. As the surface sheet 30, a hydrophobic nonwoven fabric can be used in addition to a hydrophilic nonwoven fabric using hydrophilic raw material fibers or subjected to a hydrophilic treatment.

As shown in FIG. 1 and FIG. 7 to FIG. 9, the top sheet 30 has a large number of recesses 31 arranged at intervals on the skin contact side surface, so that the portion between the bottoms of the recesses 31 is relatively It is made of a non-woven fabric that has a raised protrusion 32 and has a fiber density that increases as it approaches the bottom of the recess 31. The surface sheet 30 may have an uneven shape on the entire skin contact side surface, or only the wearer's excretion opening contact portion (particularly the anus contact portion) may have an uneven shape. Although unevenness may be provided on the back surface of the topsheet 30, it is preferable that there is no unevenness. As a method of providing the uneven shape on the nonwoven fabric of the topsheet, any of publicly known methods such as a method of forming with a mesh pattern at the time of nonwoven fabric formation and a method of imparting the recess 31 to the formed nonwoven fabric by heat embossing can be used. Since the fiber density needs to be higher in the concave portion 31 than in the convex portion 32, it is desirable to provide irregularities on the surface sheet by a method involving compression, particularly heat embossing. In particular, in the case of heat embossing, the flexibility of the surface sheet is easily impaired in the recess 31, and thus the recess 31 is formed so that the area thereof is smaller than the area of the protrusion 32 (part other than the bottom of the recess 31). It is preferable.

The shape and arrangement of the recesses 31 are not particularly limited, but the dot-like recesses 31 are provided in the form of dots such as a staggered arrangement (example shown in FIG. 7) or a matrix arrangement (example shown in FIG. 11) as shown in the figure. Is preferred. In this case, the diameter 31r of the recess 31 is preferably 0.5 to 2.0 mm, particularly 1.0 to 1.5 mm. Further, the interval (width direction and longitudinal direction) 31d between the recesses 31 is preferably 0.5 to 4.0 mm, particularly preferably 1.5 to 3.0 mm. In particular, the area ratio of the recesses 31 on the surface of the topsheet 30 (ratio of the area of the recesses 31 in the recess formation region of the topsheet 30) is preferably 10 to 20%, particularly preferably 11 to 14%. The depth 31z of the recess 31 is preferably 0.5 to 2.0 mm, particularly 1.0 to 1.5 mm.

The nonwoven fabric constituting the top sheet 30 is preferably one having a basis weight of 15 to 25 g / m ² , particularly 20 to 25 g / m ² . If the basis weight is too low, it is difficult to make a difference in uneven portions due to heat embossing. If the basis weight is too high, the thickness of the convex portion 32 increases, and the liquid is easily retained in the convex portion 32. The thickness of the top sheet 30 is preferably 0.2 to 0.8 mm, particularly 0.3 to 0.6 mm. The fiber length of the fibers constituting the nonwoven fabric is 35 to 60 mm (more preferably 40 to 55 mm), and the fineness is 1.5 to 3.3 dtex (more preferably 2.2 to 2.8 dtex). preferable.

The Clark stiffness (JIS P 8143 (1996)) of the nonwoven fabric constituting the surface sheet 30 is preferably 60 to 100, particularly preferably 70 to 85. If the stiffness is higher than 100, the flexibility of the skin contact surface is impaired, and the wearing feeling is inferior. On the other hand, when it is lower than 60, the uneven shape is difficult to be held and is easily crushed. The top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 is provided between the top sheet 30 and the absorbent element 50 in order to move excrement that has passed through the top sheet 30 to the absorbent element and prevent reversal.
The intermediate sheet 40 is preferably composed of a non-woven fabric having a higher water absorption (JIS L 1907 Bayrec method) than the top sheet 30. For this purpose, for example, as a nonwoven fabric of the intermediate sheet 40, a raw material nonwoven fabric having a hydrophilic property higher than that of the nonwoven fabric of the topsheet 30 is used, and a material similar to the topsheet 30 is provided with a hydrophilic agent. It can also be used. Although the raw material fiber of the nonwoven fabric used for the intermediate sheet 40 is not particularly limited, it is preferable to use synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene and polypropylene. As a processing method of the nonwoven fabric constituting the intermediate sheet 40, any known method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method, or the like is used. However, the use of an air-through method having bulkiness is particularly preferred.

The intermediate sheet 40 may have irregularities on at least one surface of the front and back surfaces, but preferably has no irregularities on both the front and back surfaces. A non-porous nonwoven fabric is preferably used as the intermediate sheet 40 as shown in FIG. 7 and FIG. 8 because it has excellent diffusibility in the intermediate sheet 40. However, as shown in FIG. 11 and FIG. It is also a preferred form to use a non-woven fabric having 41). The opening may be provided by a mesh pattern at the time of forming the nonwoven fabric, but is preferably provided by a punching process using a heated punching pin (for example, a process using a punching device disclosed in JP-A-6-238597). By performing the perforating process with the perforating pins, the fibers at the periphery of the opening are melted to form a film, and the density of the surrounding fibers becomes denser than other parts. Therefore, the excrement reaching the intermediate sheet 40 is caused by capillary action. Easy to move to the peripheral edge of the aperture.

The opening 41 may be disposed on the entire intermediate sheet 40 as illustrated, or may be disposed only on the wearer's excretion opening contact portion (particularly the anus contact portion). The diameter 41r of the opening 41 is preferably 0.1 to 1.0 mm, particularly 0.4 to 0.8 mm. Further, the distance 41d between the openings 41 is preferably 1.0 to 5.0 mm (more preferably 1.5 to 3.5 mm) and smaller than the distance 31d of the concave portion 31 of the topsheet 30. In the portion where the opening 41 is provided, it is preferable that there are more openings 41 than the recesses 31. In particular, when the aperture 41 is formed by a perforated pin, a large number of apertures 41 are arranged to increase the density of fibers near the periphery of the aperture, and therefore excretion from the topsheet 40 to the intermediate sheet 30 is further increased. It is thought that things are easy to move. Moreover, the transfer of the excrement having high viscosity to the absorber can be made quicker.

As the nonwoven fabric used for the intermediate sheet 40, it is preferable to use a nonwoven fabric having a higher fiber density than the nonwoven fabric of the top sheet 30. The basis weight of the intermediate sheet 40 is preferably 20 to 30 g / m ² , particularly preferably 20 to 23 g / m ² . The thickness of the intermediate sheet 40 is preferably 0.1 to 0.5 mm, particularly preferably 0.1 to 0.4 mm. Further, the fiber length of the fibers constituting the nonwoven fabric is 35 to 60 mm (more preferably 40 to 55 mm), and the fineness is 1.7 to 5.0 dtex (more preferably 1.7 to 2.8 dtex). preferable.

The Clark stiffness (JIS P 8143 (1996)) of the nonwoven fabric constituting the intermediate sheet 40 is 30 to 80, particularly 30 to 60, and is preferably lower than the top sheet 30. If the stiffness is higher than 80, the unevenness caused by partial joining with the topsheet 30 becomes large, and the contact area with the absorber 56 (or the packaging sheet 58) becomes small, so that the absorption efficiency may be reduced. There is. On the other hand, if it is lower than 30, the feeling of thickness required for the intermediate sheet is impaired.

Although the intermediate sheet 40 in the illustrated form has the same width as the top sheet 30, it may be shorter than the width of the absorbent element 50 and disposed only in the center. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

(Join surface sheet and intermediate sheet)
As shown in FIGS. 8, 9 and 12, the intermediate sheet 40 is joined at the bottom of the recess 31 of the top sheet 30. As a joining method, known methods such as adhesion with a hot-melt adhesive, spunlace, heat embossing, ultrasonic welding, and the like can be used. The heat embossing which has the advantage that it can join simultaneously with formation of can be used suitably. When heat embossing is used as a joining means, it is preferable to use a material having a melting point comparable to that of the top sheet 30 as the material of the intermediate sheet 40. It is preferable that the top sheet 30 and the intermediate sheet 40 are bonded to each other in all the recesses, but may have a portion that is not bonded.

On the other hand, it is desirable that a portion corresponding to the convex portion 32 of the topsheet 30 is not joined to the intermediate sheet 40 and a gap 33 is provided between the topsheet 30 and the intermediate sheet 40. As a method of providing the gap 33, for example, the following method is proposed. That is, when only the portion of the concave portion 31 of the topsheet 30 is joined to the intermediate sheet 40 by heat embossing, the intermediate sheet 40 and the topsheet 30 are joined while being transported in the production line while being transported, and the tension is released after joining. By contracting the intermediate sheet 40 from the top sheet 30, the unbonded portion (the convex portion 32) of the top sheet 30 can be lifted from the intermediate sheet 40 and separated.

When the top sheet 30 and the intermediate sheet 40 are joined by heat embossing, unevenness is likely to occur on the side surface of the absorber of the intermediate sheet 40. Since it is preferable to make the contact area between the intermediate sheet 40 and the absorbent body 56 (or the packaging sheet 58) as large as possible, the intermediate sheet 40 is absorbed as much as possible, such as fixing the intermediate sheet 40 to a smooth support during heat embossing. It is preferable to take measures that do not cause unevenness on the side of the body.

By adopting such a structure, the excrement that has reached the convex portion 32 of the top sheet 30 can easily move to the periphery of the concave portion 31, and the unevenness of the top sheet 30 can be increased to reduce the skin contact area. It is considered that there is an advantage that the cushioning property of the seat 30 can be increased.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface. The thickness of the absorbent element 50 is not particularly limited, but is preferably about 3 to 5 mm.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate in addition to short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be, for example, about 100 to 300 g / m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m ² for filament aggregates, for example. Can do. The fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. In addition, a crimped fiber that is uniformly crimped is often used.

(Superabsorbent polymer particles)
The absorbent body 56 preferably includes superabsorbent polymer particles. In particular, at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. Is desirable.

When there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or there is very little, it cannot be said that it is "dispersed in the whole thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the fiber assembly and remain on the surface thereof, and a form in which some SAP particles pass through the fiber assembly and are on the packaging sheet 58 are also excluded. It is not something.

The superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more, particularly 57 to 65 g / g are suitable. Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 35 g / g / s or less, particularly 35 to 75 g / g / s are preferably used. When the water absorption speed exceeds 35 seconds, so-called reversal that the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m ^2, and particularly preferably 120 to 200 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of superabsorbent polymer particles is given.

(Packaging sheet)
When the packaging sheet 58 is used, crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, or the like can be used as the material. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight of the packaging sheet 58 is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

As shown in FIG. 3, the packaging sheet 58 may wrap only the back surface and side surfaces of the layer in addition to the form of wrapping the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Roughness of the absorbent element surface)
Characteristically, as shown in FIGS. 7 and 8, a large number of recesses 51 are arranged on the surface of the absorbent element 50 at intervals, and the portions between the bottoms of the recesses 51 are relatively raised. The density of the fiber increases as it approaches the bottom of the recess 51. In addition, the intermediate sheet 40 and the top of the convex portion 52 of the absorbent element 50 are joined, and a space 53 is formed between the back surface of the intermediate sheet 40 and the bottom of the concave portion 51 of the absorbent element 50. By having such a structure, as described above, it has the advantage of the surface sheet 30 having unevenness on the skin contact surface, and quickly absorbs high-viscosity excrement without impairing the absorption performance of low-viscosity excrement. It becomes possible to move to the element 50.

As a method for joining the intermediate sheet 40 and the absorbent element 50, known methods such as adhesion with a hot melt adhesive, spunlace, heat embossing, ultrasonic welding, etc. can be used. Since the surface sheet 30 and the intermediate sheet 40 are easily joined at a position different from the joining portion, bonding by hot melt adhesive spiral coating, summit coating, or the like is preferable. The absorbent element 50 is preferably joined to the intermediate sheet 40 at all of the convex portions 52, but may have a portion that is not joined. Moreover, although it is preferable that a space is formed between the concave portion of the absorbent element and the intermediate sheet 40, the space may be crushed.

The absorbent element 50 may have an uneven shape on the entire side surface of the intermediate sheet, or only the wearer's excretory opening contact portion (particularly the anus contact portion) may have an uneven shape. As a method of providing the absorbent element 50 with a concavo-convex shape, the fiber density needs to be higher in the concave portion 51 than in the convex portion 52, and therefore a method involving compression such as heat embossing is preferable.

The shape and arrangement of the recesses 51 are not particularly limited, but it is preferable to arrange the groove-shaped (linear) recesses in an oblique lattice pattern as shown in FIGS. 7 and 10A. It is also preferable to modify this form so as to form an intermittent form in which no concave portion is provided at the intersection of the lattice as shown in FIG. Although not shown, a lattice shape including a groove-like recess along the longitudinal direction and a groove-like recess along the width direction may be used. Furthermore, as shown in FIGS. 10C and 10D, it is also preferable to provide dot-shaped concave portions such as circular shapes and short line shapes in a dotted pattern such as a staggered arrangement (illustration example) or a matrix arrangement (not shown). When the recess 51 is a lattice pattern, the width 51r of the recess is preferably 0.6 to 2.5 mm, particularly 1.2 to 2.0 mm. In the case of a dot pattern, the diameter of the recess (the longest portion) The length) is preferably 0.5 to 2.5 mm, particularly preferably 1.0 to 2.0 mm. Further, the interval between the recesses 51 (interval between parallel grooves in the case of a lattice pattern, or interval in the width direction and the longitudinal direction in the case of a dot pattern) 51d is preferably 5 to 30 mm, particularly 10 to 15 mm. In particular, the area ratio of the recesses 51 on the surface of the absorbent element 50 (ratio of the area of the recesses 51 in the recess formation region of the absorbent element 50) is preferably 20 to 30%, particularly preferably 25 to 28%. The depth 51z of the recess 51 is preferably 1.0 to 3.0 mm, particularly preferably 1.5 to 2.0 mm.

In the present invention, the concave portions 31 of the topsheet 30 are formed as a large number of dot-shaped concave portions 31 arranged in a dotted pattern, and the concave portions 51 of the absorbent element 50 are made larger than the diameter of the dot-shaped concave portions 31 of the topsheet 30. It is preferable to form the groove-like recesses 51 arranged in a grid pattern with a large interval, and in particular, 50% or more, preferably 100%, of the dot-like recesses 31 of the topsheet 30 is the groove-like shape of the absorbent element 50. It is preferable to configure so as not to overlap with the recess 51. When the concave portion 31 of the surface sheet 30 has such a dot-like pattern, the surface of the surface sheet 30 while preventing the excrement adhered to the surface sheet 30 or the surface sheet 30 itself from adhering to the skin, the rash, etc. The liquid flow at can be suppressed. In addition, when the concave portions 51 of the absorbent element 50 have such a lattice pattern, the space 53 formed between the absorbent element 50 and the intermediate sheet 40 extends along the surface of the absorbent element 50, so Since the excrement reaching between the element 50 and the intermediate sheet 40 is delivered to the absorbent element 50 while diffusing along the surface of the absorbent element 50, the excrement is efficiently delivered to the absorbent element 50 and absorbed. The speed and the effect of preventing the return are further increased. Furthermore, since the lattice spacing of the recesses 51 of the absorbent element 50 is larger than the diameter of the dot-like recesses 31 of the topsheet 30, regardless of the arrangement of the recesses 31 of the topsheet 30 and the recesses 51 of the absorbent element 50 (for example, in manufacturing) Each convex part 32 of the topsheet 30 is arranged so that at least a part thereof overlaps at least one concave part 51 of the absorbent element 50 (even if inevitable deviation occurs).

(Side barrier cuffs)
Side barrier cuffs 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product in order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent side leakage. Is preferred.

The side barrier cuff 60 is constituted by a barrier sheet 62 that is substantially continuous in the width direction, and an elongated elastic elastic member 63 that is fixed to the barrier sheet 62 in an extended state along the front-rear direction. As the barrier sheet 62, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.

The inner surface of the barrier sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and on the outer side in the width direction. It fixes to the side part of the exterior sheet | seat 12 located with the hot-melt-adhesive agent etc. Out of the adhering portions, on the outer side in the width direction in the vicinity of the adhering start end, leg elastic elastic members 64 made of rubber thread or the like are provided along the front-rear direction between the sheets of the portions where the barrier sheet 62 and the exterior sheet 12 face each other. It has been.

Around the leg, the width direction inner side of the side barrier cuff 60 is fixed on the top sheet 30 at both ends in the longitudinal direction of the product, but the portion between them is an unfixed free part. The portion comes to stand by the contraction force of the rubber thread 63. When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 63 acts, so that the side barrier cuffs 60 stand up and adhere to the legs around the contraction force of the rubber thread 63. . As a result, so-called side leakage from around the legs is prevented.

Unlike the illustrated embodiment, the front and rear direction end portions of the barrier sheet 62 on the inner side in the width direction are divided into a base end side portion extending from the outer side in the width direction to the inner side in the width direction and a center side in the width direction of the base end side portion. It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.

(Fastening tape)
As shown in FIGS. 1 and 2, the fastening tape 13 has a base portion of a sheet base material 13C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper or a composite material thereof attached to the diaper and protrudes from the diaper. A hook material 13 </ b> A of a mechanical fastener is provided as a locking portion for the ventral side at the distal end side portion. The hook material 13A is joined to the sheet base 13C with an adhesive so as not to be peeled off.

In the diaper for infants, the length X1 in the width direction of the diaper is preferably 10 to 50 mm, particularly 20 to 40 mm, and the length Y1 in the front-rear direction is 20 to 100 mm, among the dimensions of the attachment portion of the fastening tape 13. In particular, the thickness is preferably 40 to 80 mm. Of the dimensions of the front end portion of the fastening tape 13, the length in the width direction of the diaper is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm. In particular, the thickness is preferably 25 to 50 mm. In addition, when a part or all of the fastening tape 13 has a substantially tapered shape, for example, and the length in the front-rear direction and the length in the width direction are not constant, the numerical range is determined by an average value. The fastening tape 13 may have a symmetrical shape such as a rectangular shape. However, if the fastening tape 13 is a convex shape composed of a wide attachment portion and an elongated tip side portion, the grip portion on the tip side portion can be easily picked and This is preferable because the tension between the bases of this region acts over a wide range. The hook member 13A has a large number of engaging protrusions on the outer surface side. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Instead of the hook material 13 </ b> A, an adhesive material layer can be provided as a locking portion of the fastening tape 13.

When installing the diaper, the fastening tape is locked to an appropriate position on the outer surface of the ventral side F with the back side flap portion BF being overlapped on the outside of the ventral side flap portion FF. The position and size of the fastening portion of the fastening tape 13 can be arbitrarily determined. In diapers for infants, the locking location is a rectangular range of 20 to 80 mm in the front-rear direction and 150 to 300 mm in the width direction, and the distance in the height direction between the upper edge and the ventral upper edge is 0 to 60 mm, particularly 20 to 50 mm. And the center in the width direction of the product.

When the fastening tape 13 is attached so that the attachment portion of the fastening tape 13 overlaps the boundary line between the back end flap portion BE and the absorbent element 50, the tension acting between the attachment portions of the left and right fastening tapes 13 when the diaper is attached. This is preferable because the back side end of the absorbent element 50 is firmly pressed against the body. Moreover, if the attachment part of the fastening tape 13 is too far from the back side end part (rear end part) of the diaper, the tension acting between the attachment parts of the left and right fastening tapes 13 when the diaper is mounted is the back side end part of the diaper. Therefore, a gap is likely to occur between the back end of the diaper and the body surface. Therefore, the length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the base portion of the fastening tape 13.

(Target sheet)
It is preferable to provide a target sheet 74 having a target for facilitating the locking at the locking position of the fastening tape 13 on the ventral side F. As the target sheet 74, when the hook portion is the hook material 13 </ b> A, a target sheet 74 can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or a nonwoven fabric so that the engagement protrusions of the hook material are entangled. In the case of an adhesive material layer, a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Further, when the fastening portion of the fastening tape 13 on the ventral side F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric and the fastening portion of the fastening tape 13 is a hook material 13A, The target sheet 74 can be omitted, and the hook material 13A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked. In this case, the target sheet 74 may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

(End flap)
The end flap part is a part that extends to the front side and the rear side of the absorbent main body 10 and does not have the absorbent element 50, and the front extension part is the ventral end flap part FE. The extended portion on the rear side is the back end flap portion BE.

The length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 13 for the reasons described above. If it is too close, a gap is likely to occur between the back end of the diaper and the body surface due to the thickness and stiffness of the absorbent element 50, so that it is preferably 10 mm or more.

The length in the front-rear direction of the ventral end flap part FE and the back end flap part BE is preferably about 5 to 20% of the length L in the front-rear direction of the entire diaper. In particular, a thickness of 20 to 50 mm is appropriate.

(Back elastic sheet)
In the illustrated form, a belt-like back-side elastic sheet 70 that elastically expands and contracts in the width direction is provided between the fastening tapes 13 to improve the fit in the diaper back side. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening tapes 13, but may be separated to the center in the width direction. The back-and-forth stretchable sheet 70 has a front-rear dimension that is approximately the same as the front-rear dimension of the attachment portion of the fastening tape 13, but may have a dimensional difference of about ± 20%. Further, when the back elastic sheet 70 is arranged so as to overlap the boundary line between the back end flap BE and the absorbent element 50 as shown, the back end of the absorbent element 50 is firmly pressed against the body. Therefore, it is preferable. The back-side elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 5, the sheet base material 71 such as two nonwoven fabrics is bonded with an adhesive such as a hot melt adhesive. Preferably, the elastic stretch member 72 such as a perforated sheet, net, or elongated (thread or string) is fixed in a stretched state in the width direction between the sheet bases 71. Used. As the sheet base 71 in this case, the same one as the exterior sheet 12 can be used. The stretch rate of the elastic elastic member 72 is preferably about 150 to 250%. Further, when an elongated member (thread-like or string-like) is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members with a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

In addition, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorbent element 50 as shown in the figure because the fitting property of the absorption element 50 is improved, but in this case, the elastic expansion / contraction member 72 is used. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.

The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.

In the illustrated embodiment, the back-side stretchable sheet 70 is sandwiched between the barrier sheet 62 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable sheet 11 and is liquid-impermeable at a portion overlapping the liquid-impermeable sheet 11. Although provided so as to be sandwiched between the permeable sheet 11 and the absorbent element 50, it may be provided between the liquid-impermeable sheet 11 and the exterior sheet 12, or provided on the outer surface of the exterior sheet 12. Alternatively, it may be provided between the top sheet 30 and the absorbent element 50. Further, the back-side elastic sheet 70 may be provided on the top sheet 30, and in this case, it may be provided on the barrier sheet 62 on both sides in the width direction of the liquid-impermeable sheet 11. Further, when the exterior sheet 12 is formed by stacking a plurality of sheet base materials, the entire back-side stretchable sheet 70 may be provided between the sheet base materials of the exterior sheet 12.

Tape-type disposable diapers having the structure shown in FIGS. 1 to 8 were manufactured according to various specifications shown in Table 1, and the following absorption rate test, reverse test, and liquid flow test were conducted. Specifications not shown in the table and below are common to all examples. In the table, “dt” means dtex, and “PE / PP” and “PE / PET” in the nonwoven fabric used for the top sheet and the intermediate sheet are sheath-core type with the former as the sheath and the latter as the core, respectively. Bicomponent fibers are meant, and the blending ratio of those using two or more kinds of fibers means weight ratio.
(Absorption rate test)
(1) On the flat plate installed horizontally, the sample was developed and stuck and fixed so that the topsheet was on top.
(2) Using an injection tube, 15 cc of artificial water-like stool (or artificial urine) was dropped from a height of 1 cm upward (dropping rate: 2 cc / s) at a position of 130 mm from the dorsal end to the ventral side of the sample. .
(3) The time from the end of dropping to the drying of the liquid on the top sheet was measured and taken as the absorption rate. Note that whether or not it was dried was determined by visual observation.
(Reverse amount test)
(1) and (2) in the above absorption rate test were carried out in order, and when 3 minutes passed from the end of dropping, 10 filter papers were placed at the dropping place, and a 1 kg weight (area of the filter paper contact surface 100 cm ² ) was placed thereon. And leave for 1 minute. The weight of the filter paper before and after that is measured, and the weight obtained by subtracting the weight of the filter paper before the test from the weight of the filter paper after the test is defined as the reversal amount.
(Liquid flow test)
(1) A sample was spread on a 15-degree inclined plate and fixed so that the surface sheet was on top. At this time, the sample was disposed such that the ventral side of the sample was positioned on the upper side in the tilt direction of the tilt plate, and the back side was positioned on the lower side in the tilt direction of the tilt plate.
(2) Using an injection tube, 5 cc of artificial water-like stool was dropped from a height of 1 cm upward (dropping speed: 7 cc / s) at a position 80 mm from the ventral end to the back side of the sample.
(3) The distance that the artificial water-like stool flowed on the surface sheet from the dropping position was measured with a ruler. The end position of the flow was determined by visual observation by the operator.
(Artificial urine)
Artificial urine (1000 g) was prepared by mixing urea: 200 g, sodium chloride: 80 g, calcium chloride (dihydrate): 3 g, magnesium sulfide: 8 g, and ion-exchanged water: 709 g.
(Artificial water-like flight)
For artificial water-like stool, first, artificial urine and miso (trade name “Kaneko Miso Dashi Miso” manufactured by Kaneko Miso Co., Ltd.) are mixed 1: 1 to adjust the artificial stool, and then Sanyo Kasei. It was prepared by adding 185 g of artificial stool to 15 g of the trade name “Sannonic (registered trademark)”, which is a higher alcohol nonionic surfactant manufactured by Kogyo Co., Ltd., and adding 200 g of artificial urine (400 g in total) and mixing.

The test results are shown in Table 1. As shown in the table, in Examples 1 to 7 according to the present invention, superior test results were obtained as compared with the conventional example.

The present invention can be applied to a wide range of uses such as pants-type, tape-type, or pad-type absorbent articles.

DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Surface sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 51 ... Absorbing element recessed part, 52 ... Absorbing element convex part, 53 ... Space, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet, 70 ... Back elastic sheet, 74 ... Target sheet, 31 ... Surface sheet recess, 32 ... Surface sheet projection, 33 ... Gap, 41 ... Intermediate sheet Open hole.

Claims

A liquid-permeable surface sheet and a liquid-impermeable sheet, an absorbent element including a fiber assembly interposed therebetween, and an intermediate sheet interposed between the surface sheet and the absorbent element. In disposable absorbent articles,
The surface sheet is formed by arranging a large number of recesses on the skin contact side surface at intervals, so that the portion between the bottoms of the recesses is a relatively raised projection, and the fibers are closer to the bottom of the recesses. Made of non-woven fabric with high density,
The intermediate sheet is made of nonwoven fabric,
The absorbent element has a large number of concave portions arranged on the surface at intervals, so that the portion between the bottom portions of the concave portions is a convex portion that is relatively raised, and the fiber density increases as the bottom portion of the concave portion is approached. And
Each convex portion of the topsheet is disposed so that at least a portion thereof overlaps at least one concave portion of the absorbent element,
At least the bottom of the recess in the top sheet and the intermediate sheet, and the intermediate sheet and at least the top of the projection in the absorbent element are joined, respectively, and the back surface of the intermediate sheet and at least the recess in the absorbent element A space is formed between the bottom,
A disposable absorbent article characterized by that.
The area ratio of the recesses on the surface of the surface sheet is 10 to 20%, the area ratio of the recesses on the surface of the absorbent element is 20 to 30%, and the depth of the recesses of the absorbent element is 1 to 3 mm. The disposable absorbent article according to claim 1.
The concave portions of the topsheet are a large number of dot-shaped concave portions having a diameter of 0.5 to 2.0 mm arranged in a dotted pattern, and the concave portions of the absorbent element are spaced apart from each other by a larger distance than the diameter of the dot-shaped concave portions. The disposable absorbent article according to claim 2, which is a groove-like recess having a width of 0.6 to 2.5 mm and arranged in a lattice.
The non-woven fabric of the surface sheet is a hydrophilic air-through non-woven fabric having a synthetic fiber having a fineness of 1.5 to 3.3 dtex as a raw fiber, a thickness of 0.2 to 0.8 mm, and a basis weight of 15 to 25 g / m 2 .
The non-woven fabric of the intermediate sheet is made of synthetic fiber having a fineness of 1.7 to 5.0 dtex as a raw material fiber, and has a thickness of 0.1 to 0.5 mm and a basis weight of 18 to 30 g / m 2. It is a hydrophilic air-through nonwoven fabric with high density,
The absorbent element is formed by wrapping a laminated body obtained by mixing and superimposing superabsorbent polymer particles and pulp with a packaging sheet made of crepe paper, and the basis weight of the superabsorbent polymer particles is 50 to 350 g / m 2. The basis weight of the pulp is 100 to 300 g / m 2 , and the basis weight of the crepe paper is 5 to 40 g / m 2 ;
The superabsorbent polymer particles have a water absorption amount specified by JIS K 7223-1996 of 40 g / g or more and a water absorption rate specified by JIS K 7224-1996 of 35 g / g / s or less.
The disposable absorbent article according to any one of claims 1 to 3.