JP5463080B2 - Absorbent articles - Google Patents

Description

  The present invention relates to a disposable absorbent article such as a sanitary napkin, a panty liner, a urine absorption pad, and a disposable diaper for absorbing menstrual blood, cages, and the like.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable top sheet such as a nonwoven fabric or a liquid-permeable plastic sheet And an absorbent body having a compression restoring property made of cotton-like pulp or the like is interposed therebetween.

  Since the top sheet forms a skin contact surface, it is required to be flexible, to obtain a dry touch even after excretory fluid absorption, and to be less irritating to the skin. Synthetic fiber nonwoven fabrics and resin mesh sheets are widely used in the field of absorbent articles, particularly in the field of sanitary napkins, as materials satisfying such requirements. However, the top sheet made of synthetic fibers has a problem that it becomes a factor such as itching and rash.

  In order to solve this problem, a top sheet made of cotton fiber (cotton) has been proposed. However, in absorbent articles, the top sheet has high liquid permeability and allows the liquid to quickly reach the absorber. On the other hand, when ordinary absorbent cotton fibers are contained in the top sheet, there is a problem that the top sheet itself has a high liquid retention and the sticky feeling tends to remain on the surface.

  Under such a background, a spunlace nonwoven fabric composed of cotton fibers drifted while leaving the natural fats and oils adhering to the raw cotton, and thermoplastic short fibers having at least a fiber surface made of an olefin polymer, It has been proposed to be used as a top sheet of an absorbent article (see Patent Document 1). In this technique, the liquid retention of the top sheet is suppressed due to the weak water repellency of natural fats and oils remaining in the cotton fibers and the excellent water repellency of the thermoplastic short fibers. Furthermore, in order to move the absorbed liquid quickly to the absorption layer under the top sheet, it has also been proposed to provide a large number of openings in the top sheet.

JP 2005-139594 A

  The top sheet disclosed in Patent Document 1 has low hygroscopicity with respect to the amount of cotton blended because the oil agent remains in the entire cotton fiber and has water repellency. On the other hand, in order to improve the hygroscopicity of the top sheet, it can be assumed that the degreased cotton fiber is highly blended. However, such a top sheet has a high liquid retention property and has a sticky skin contact surface. It tends to be a factor. Thus, it has been difficult for the top sheet to retain both the hygroscopicity and the reduction of stickiness on the skin contact surface.

  The main problem of the present invention is that the top sheet can sufficiently prevent stickiness due to liquid residue on the surface while the top sheet has good skin perception, moisture absorption, and sweat absorption, and sufficiently conceals the absorbed excretory fluid. It is to provide an absorbent article that can be used.

  The present invention which solved the above-mentioned problem of providing an absorbent article having good per-skin skin and hygroscopicity while suppressing stickiness is as follows.

<Invention of Claim 1>
In an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet disposed on the front surface side and a back sheet disposed on the back surface side,
The top sheet is made of a non-woven fabric including two layers of non-woven cotton layers formed from a fiber material containing 70% or more of cotton fibers.
Of the two cotton non-woven fabric layers, the upper layer contains a water repellent, the skin contact surface has a water absorption of 0 to 5 mm, and at least in the excretion opening portion, a large number of openings that penetrate the front and back are provided. And
The lower layer is more hydrophilic than the upper layer, does not have an opening larger than the size of the opening provided in the upper layer, and is configured to have a lower aperture ratio than the upper layer ,
A heat-fusible nonwoven fabric layer made of a fiber material containing 70% by weight or more of hydrophilic synthetic fiber is further laminated below the cotton nonwoven fabric layer of the nonwoven fabric constituting the topsheet, and the topsheet An embossed recess that bites into the absorbent body from the surface of was formed by thermocompression bonding ,
An absorbent article characterized by the above.

(Function and effect)
As described above, the skin contact surface of the top sheet of the present invention is composed of a non-woven fabric layer that is highly blended with cotton fibers, so that it has good skin contact and is unlikely to cause itchiness or rash. Have.

  In addition, by adding a water repellent to the upper layer that is in direct contact with the skin and reducing the water absorption of the skin contact surface, the remaining liquid on the surface, which is a problem with cotton fibers, is sufficiently improved. However, simply lowering the water absorption rate makes it difficult for the excrement liquid to permeate the upper layer of the top sheet and cause lateral leakage, etc., so that at least the excretion port in the upper layer penetrates the front and back. A number of openings are provided. The term “opening” as used herein refers to a hole that is intentionally drilled by a method such as supporting a fiber material on a mesh-like support during layer formation, or punching a hole after layer formation. It does not indicate the fiber gap existing in the gathering part. The “opening ratio” means the ratio of the total area of the openings to the total area of the top sheet.

  Furthermore, the nonwoven fabric constituting the top sheet is formed by laminating two layers of nonwoven fabric, and the lower layer is more hydrophilic than the upper layer, and the size and opening ratio of the opening are smaller than the upper layer. And More preferably, the lower layer is not subjected to opening treatment or water repellent treatment. By setting it as such a structure, the lower layer of a top sheet is exposed to the skin side from the said opening part, and can absorb the sweat and moisture which generate | occur | produce from the skin surface with excretion liquid. In addition, since the upper layer and the lower layer form a recess, the lower layer does not touch the skin directly, so even if the lower layer has water retention, the skin is sticky. It is not a factor of feeling.

As a result, according to the present invention, it is possible to provide an absorbent article that has good skin feel, moisture absorption, and sweat absorption, and can sufficiently prevent stickiness due to liquid residue on the surface.
Moreover, since the upper layer itself has water repellency, the absorbed excretory fluid is difficult to return to the surface and difficult to retain, and the low transparency due to the cotton fiber is sufficient to absorb the excreted excretory fluid. Can be concealed.
In addition, non-woven fabric containing highly blended cotton does not have good heat-fusibility, cannot form a fit embossed part by thermocompression bonding between the top sheet and the absorbent body, and does not provide a drainage blocking effect. There is a problem. The present invention enables thermocompression bonding between the topsheet and the absorbent body by disposing a non-woven fabric layer having heat-fusibility in the lowermost layer of the topsheet. Still, since the skin contact surface is high in the blending of cotton, the good per skin and hygroscopicity can be maintained in a good state.
In the present invention, the side closer to the skin is defined as “upper side”. The “water absorption” in the present invention means the water absorption measured according to the JIS L 1907 Bayrec method, and the “excretion port portion” means the excretion port (in the sanitary napkin, the blood drainage port). ).

<Invention of Claim 2 >
The uppermost layer of the cotton nonwoven fabric layer has a thickness of 0.05 to 1.0 mm, a fiber basis weight of 10 to 30 g / m ² , an area of each opening of 0.5 to 8.0 mm ² , and an opening ratio of 15 to 65. %
The water repellent includes a stearic acid compound,
The amount of the water repellent added to the uppermost layer of the cotton nonwoven layer is 0.05 to 0.15 parts by weight with respect to 100 parts by weight of the fiber,
A sanitary napkin,
The absorbent article according to claim 1.

(Function and effect)
In the case of a sanitary napkin, it is preferable to adopt such a configuration. In particular, the amount of water repellent added is too large, the area of each opening is too small, or the opening ratio is too low, it becomes difficult for the liquid to permeate the top layer of the top sheet, and the area of each opening is too large. Then, there is a risk that the excretory fluid that has once passed through the opening and moved to the absorber side will return through the opening. Therefore, the combination of the above numerical ranges is very important.

<Invention of Claim 3 >
The bottom layer of the cotton nonwoven fabric layer has a thickness of 0.05 to 1.0 mm, a fiber basis weight of 10 to 30 g / m ² , has no opening, and is configured not to contain a water repellent. The absorbent article according to 1 or 2 .

(Function and effect)
It becomes possible to raise the hygroscopic effect which cotton has more by making the lowermost layer of a cotton nonwoven fabric layer into such composition.

<Invention of Claim 4 >
The topsheet and the absorbent body are at least partially in direct contact;
The absorbent article in any one of Claims 1-3 in which the said absorber contains a heat-fusible fiber in the part which contacts the said top sheet at least.

(Function and effect)
The effect of thermocompression bonding with the heat-fusible nonwoven fabric layer is further increased by mixing the heat-fusible fiber in at least the portion of the absorber that contacts the top sheet.

<Invention of Claim 5 >
The absorbent body is wrapped in a packaging sheet;
The topsheet and the packaging sheet are at least partially in direct contact;
The absorptive article according to any one of claims 1 to 3 in which said packaging sheet contains heat-fusible fiber at least in a portion which contacts said top sheet.

(Function and effect)
By wrapping the absorbent body with a packaging sheet, the shape and the polymer powder can be retained. Furthermore, the effect similar to Claim 6 is seen by including a heat-fusion fiber in a packaging sheet.

<Invention of Claim 6 >
Non-woven fabric including two layers or three or more layers is formed by forming each non-woven fabric layer and superimposing them, and interlacing the fibers between the layers by a high-pressure water stream.
The absorbent article in any one of Claims 1-5 .

(Function and effect)
In forming a nonwoven fabric having a multilayer structure, the adhesive is not used at the time of lamination, and the spunlace method (hydroentanglement method) is used to prevent the deterioration of the texture due to the adhesive and reduce the irritation to the skin. be able to.

  According to the present invention, in the absorbent article, the top sheet surface is formed of a fiber material containing a highly blended cotton fiber, so that the skin feels good and has excellent hygroscopic and sweat-absorbing properties such as itching and rash. Although it has many features of cotton fibers that are difficult to cause, it is possible to sufficiently prevent stickiness due to liquid residue on the surface and to conceal the absorbed excretory fluid sufficiently. It is.

It is an expanded view of a sanitary napkin. It is the cross-sectional view (II-II line arrow view of FIG. 1). It is the cross-sectional view (III-III arrow directional view of FIG. 1). It is sectional drawing of a top sheet. (A) 1st form of a top sheet, (B) 2nd form of a top sheet, (C) 3rd form of a top sheet.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Example of basic structure of sanitary napkin>
FIG. 1 is a developed view showing an example of a sanitary napkin as an absorbent article according to the present invention. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG. The sanitary napkin 1 illustrated in the figure includes a liquid-impervious backsheet 2 made of a polyethylene sheet or the like, a skin contact surface 3F, and a topsheet 3 that allows rapid passage of menstrual blood, or vaginal discharge, The absorbent bodies 4 and 5 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3 and the substantially lateral edge portion of the absorbent body 4 as an upright base end and include at least a body fluid discharge portion And a pair of left and right three-dimensional gathers BS and BS provided so as to protrude to the front surface side in a predetermined section in the front-rear direction. The outer edge portion of the conductive back sheet 2 and the top sheet 3 is bonded by an adhesive such as hot melt or an adhesive means such as heat seal, and the both side edge portions extend to the side of the absorbent body 4. Liquid back The sheet 2 and the side nonwoven fabric 7 forming the three-dimensional gather BS are joined together by an adhesive such as hot melt or an adhesive means such as heat seal, and the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 are laminated. Wing-like flaps W and W projecting sideways are formed by the seat portion, and second wing-like flaps WB and WB are formed in a portion located on the heel side from this. In the illustrated example, the absorbers 4 and 5 have a two-layer structure in which the absorber 4 portion forms a middle-high portion, but a single-layer structure may be used, and absorbers of the same size and shape may be used. A stacked two-layer structure may be used.

  As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be 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. One or a plurality of adhesive layers (not shown) are formed on the non-use surface side (outer surface) of the liquid-impermeable back sheet 2 so that the sanitary napkin 1 is fixed to the underwear when worn on the body. It has become. As the liquid-impermeable back sheet 2, a polylaminated nonwoven fabric in which a plastic film and a nonwoven fabric are laminated may be used.

  The absorbent bodies 4 and 5 may be any one that can absorb and retain body fluids. Usually, a fluffy pulp mixed with a water-absorbing polymer powder is preferably used from the viewpoint of absorption function and price. The absorbent bodies 4 and 5 are preferably surrounded by the packaging sheets 4L and 5L for holding the shape and polymer powder. As the packaging sheets 4L and 5L, known sheets such as crepe paper and hydrophilic non-woven fabric can be used, but olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., or composite fibers, copolymers, blends thereof, etc. It is more preferable to use a sheet mixed with synthetic fibers having heat-fusibility. The heat-sealable fiber may be mixed at least in a portion that is in direct contact with the top sheet, but it is more preferable to mix the heat-bonded fiber as a whole from the viewpoint of manufacturing efficiency. In the illustrated example, the upper layer absorbent body 5 is provided along the center in the width direction on the upper side of the lower layer absorbent body 4, but the upper layer absorbent body 5 and its packaging sheet 5L are omitted, and only the single absorbent body 4 is used. For example, a known absorber structure can be adopted. In this case, it is preferable that the heat-bonding fiber is contained in at least a portion of the absorbers 4 and 5 that are in direct contact with the top sheet, and it is more preferable that the heat-absorbing fiber is contained in the entire absorber.

  In the illustrated example, the intermediate sheet 6 is folded into a cylindrical shape to have a two-layer structure, but may be a single-layer structure without being folded. The intermediate sheet 6 may be provided over the entire skin contact surface, but is preferably provided only in the center in the width direction and in the front-rear direction intermediate portion (particularly the crotch portion). The material of the intermediate sheet 6 may be any material having liquid permeability, but a material having hydrophilicity is preferable. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used.

In the illustrated example, the top sheet 3 is slightly wider than the width of the absorbent body 4 and only covers the absorbent body 4, and the outer side in the width direction of the top sheet 3 extends from the both side surfaces of the top sheet 3. It is covered with existing side nonwoven fabric 7 (a member different from the top sheet). A portion on the center side in the width direction of the side nonwoven fabric 7 forms a three-dimensional gather BS. As the side non-woven fabric 7, a non-woven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment can be used according to the purpose of preventing menstrual blood or vaginal discharge from penetrating or enhancing touch feeling. . The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 13 to 23 g / m ² , and in order to reliably prevent permeation of bodily fluids, it is coated with a water-repellent agent such as silicon or paraffin. The water-repellent treated non-woven fabric is preferably used.

  As shown in FIGS. 2 and 3, the side nonwoven fabric 7 is a range from the inner side position of the absorbent body 4 to the outer edge of the liquid-impervious backsheet 2 slightly beyond the intermediate side position of the absorbent body 4 from the widthwise intermediate portion. A pair of left and right wing flaps W are bonded to the absorbent body side portion substantially corresponding to the body fluid discharge portion by the laminated sheet portion of the side nonwoven fabric 7 and the liquid-impermeable back sheet 2. , W are formed, and second wing-shaped flaps WB, WB are formed at the buttock side position. These wing-shaped flaps W, W and the second wing-shaped flaps WB, WB are respectively provided with adhesive layers 12 ... 13, and the wing-shaped flaps W, W are at the position of the folding line RL when mounted on the shorts. It is folded back to the opposite side, wrapped around the crotch part of the shorts and fastened.

  On the other hand, while the inner side part of the side nonwoven fabric 7 is folded back substantially double, a thread-like elastic elastic member 19 in which both ends or appropriate positions in the longitudinal direction are fixed to the middle portion in the height direction inside the double sheet. And a plurality of, in the illustrated example, two thread-like elastic elastic members 20 and 20 are arranged at both ends or in appropriate positions in the longitudinal direction at the upper portion of the thread-like elastic elastic member 19. Has been. As shown in FIG. 3, the double sheet portion is bent and laminated on the absorbent body 4 side in a state of being folded in a Z-shaped cross section, thereby bending the portion where the elastic elastic member 19 is disposed. As a point, three-dimensional gathers BS and BS standing on the surface side are formed while forming a pocket with an opening facing inward in a cross-sectional shape.

  On the other hand, in the sanitary napkin 1, as shown in detail in FIG. 4, on the use surface side of the lower layer absorbent body 4, an annular shape that is elongated in the longitudinal direction of the napkin and closed in the circumferential direction at the center in the width direction. In the region defined by the embossed recess 8, a mid-high portion is formed by the upper layer absorbent body 5 that is raised to the use surface side with respect to the surroundings. The embossed recess 8 is formed so as to bite from the surface of the top sheet 3 into the absorber 4. If the thickness of the middle-high part is too thick, the rigidity of the lower layer absorbent body 4 is increased and the adhesion to the body is lowered, so that it is preferably 3 to 20 mm, preferably 5 to 15 mm. A rear end independent emboss 9 having a substantially inverted umbrella shape is formed on the rear side of the embossed recess 8 with a predetermined distance from the embossed recess 8.

<First form of the top sheet (reference form) >
The top sheet 3 forms a skin contact surface 3 </ b> F that is a portion covering the surface side of the absorbers 4 and 5.
A sectional view of the first form of the top sheet 3 is shown in FIG. The nonwoven fabric of the top sheet 3 is formed by laminating two layers of cotton nonwoven fabric layers 41 and 42 made of a fiber material containing 90% by weight or more of cotton fibers. The cotton nonwoven upper layer 41 is disposed on the skin side, and the cotton nonwoven lower layer 42 is disposed on the absorbent side. The fibers contained in the cotton nonwoven fabric layers 41 and 42 are preferably 95% by weight or more, more preferably 100% cotton fibers.

The thickness of the upper non-woven cotton layer 41 of the top sheet 3 is 0.05 to 1.0 mm, preferably 0.2 to 0.6 mm, and the fiber basis weight is 10 to 30 g / m ² , preferably 15 to 20 g / and m ^2. When the fiber basis weight is less than 10 g / m ² , the concealment property of the excretory liquid becomes poor, and when it exceeds 30 g / m ² , there is a problem that the excretion liquid is easily retained.

The thickness of the lower cotton nonwoven lower layer 42 is 0.05 to 1.0 mm, preferably 0.2 to 0.6 mm, and the fiber basis weight is 10 to 30 g / m ² , preferably 15 to 20 g / m ² . To do.

As cotton fibers, all kinds of cotton fibers are used, such as raw cotton, scoured / bleached cotton fibers, scoured / bleached and dyed cotton fibers, and even garments made from yarn or fabric. However, scoured and bleached absorbent cotton fibers are particularly preferred.
As the synthetic fibers constituting the cotton nonwoven fabric layers 41 and 42, olefins such as polyethylene or polypropylene, polyesters, polyamides, or the like, or composite fibers, copolymers, and blends thereof can be used. The fiber length of the fibers used may be any of long fibers, short fibers, or a mixture of these. The fineness is preferably 1.0 to 3.0 dtex.

  Each cotton nonwoven fabric layer can be formed by an appropriate processing 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, etc., but at least directly touch the skin. The cotton non-woven upper layer 41 is preferably formed by a spunlace method that is rich in flexibility.

In order to improve the liquid permeability of the cotton nonwoven upper layer 41, a large number of openings P1 penetrating the layer are provided. When the nonwoven fabric layer 41 is formed by the spunlace method, the opening can be formed by supporting the fiber material on the mesh-like support in the hydroentanglement process of the spunlace method. In this case, it is possible to adjust the size of each opening and the opening ratio by changing the conditions of the mesh to be used. The opening may be formed by punching (punching) the manufactured nonwoven fabric. The opening may be provided in the entire top sheet or only in a portion corresponding to the excretion opening (in the case of a sanitary napkin, the blood discharge opening). Each opening 0.5~8.0mm ^2, preferably about 5 mm ^2, the aperture ratio is set to 15 to 65%. If the opening is less than 0.5 mm ² , menstrual blood is unlikely to move to the lower layer, causing a liquid residue on the top sheet surface, and if it exceeds 8.0 mm ² , it causes a liquid reversal from the opening.

  The opening and the opening ratio of the cotton nonwoven lower layer 42 are always smaller than the cotton nonwoven upper layer 41. Preferably, the cotton nonwoven lower layer 42 is not provided with an opening.

  A water repellent is added to the cotton nonwoven upper layer 41. The water repellent may be added to the cotton fibers before the formation of the nonwoven fabric layer in advance by surface treatment with a water repellent or after the formation of the nonwoven fabric layer. When coating, known methods such as transfer, spraying, brush coating, impregnation, and dipping can be appropriately used as the coating method.

As the water repellent, among paraffin-type and silicon-type known ones, those having less irritation to the skin can be appropriately selected and used, but stearamide, zinc stearate, calcium stearate, stearin It is more preferable to select and use a less irritating oil and fat such as acid diethanolamide and magnesium stearate. In the case of using a water repellent containing a stearic acid compound in a sanitary napkin, the addition amount is preferably 0.05 to 0.15 parts by weight with respect to 100 parts by weight of the fiber (both sides in the case of double-sided coating). Total coating amount). A more preferable addition amount is about 0.08 to 0.12 parts by weight. If the amount of the water repellent added is less than 0.05 parts by weight, the water repellent effect may be insufficient, and if it exceeds 0.15 parts by weight, the water repellency is too high, making it difficult to permeate moisture.
By forming from such a cotton fiber, the water absorptivity (JIS L 1907 Bayrec method) of the skin contact surface of the cotton nonwoven upper layer 41 is 0 to 5 mm, preferably 0 to 2 mm.

  The cotton nonwoven lower layer 42 has a higher water absorption than the cotton nonwoven upper layer 41, and the water absorption of the upper layer contact surface (JIS L 1907 Bayrec method) is preferably 5 mm or more. More preferably, it is formed without performing a water repellent treatment.

  For the lamination of the non-woven fabric layer constituting the top sheet 3, a known laminating method such as entanglement (spun lace method) by high-pressure water flow or adhesion by an adhesive can be appropriately selected, but the spun lace method is used in order to maintain a soft texture. It is preferable to do.

<Second form of top sheet (reference form) >
A cross-sectional view of the second form of the top sheet 3 is shown in FIG. In this embodiment, the top sheet 3 has one or more (one in the illustrated example) cotton non-woven intermediate layer 43 between the cotton non-woven layers 41 and 42, and these three or more layers of cotton non-woven layers are laminated. can get.

  The cotton non-woven intermediate layer 43 is formed of a fiber material containing 70% by weight or more, preferably 95% by weight or more, more preferably 100% of cotton fibers.

  The size and opening ratio of the opening P2 of the cotton nonwoven intermediate layer 43 are smaller than the cotton nonwoven upper layer 41 and larger than the cotton nonwoven lower layer 42. Further, the opening P2 of the cotton non-woven intermediate layer 43 is arranged so as to overlap at least a part of P1 of the cotton non-woven upper layer 41, and the cotton non-woven lower layer 42 passes through the opening P3 at the overlapping portion with the openings P1 and P2. The structure is exposed on the skin side. It is desirable to overlap the cotton nonwoven fabric layers 41 and 43 so that the area of the opening P3 is as large as possible. The centers of the openings P1 and P2 may be aligned so that P2 opens completely to the skin contact surface via P1.

When the cotton non-woven intermediate layer 43 has two or more layers, the opening and the opening ratio are reduced toward the lower layer, and the two layers of openings are arranged so as to overlap (not shown).
The cotton non-woven intermediate layer 43 preferably has a total thickness of 0.05 to 1.0 mm and a basis weight of 10 to 30 g / m ² regardless of whether it is a single layer or two or more layers.
A water repellent is added to the cotton nonwoven intermediate layer 43. The water repellent may be added to the cotton fibers before forming the non-woven fabric layer in advance by surface treatment with the water repellent or after the non-woven fabric layer is formed. However, the water absorption in the layer is kept constant. Therefore, it is preferable to use a method of treating the fiber with water repellent beforehand. The water repellent may be the same water repellent as the cotton nonwoven fabric layer 41 or a different water repellent.

The cotton nonwoven intermediate layer 43 can be formed by an appropriate processing 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, or a point bond method.
The other characteristics of this embodiment are the same as those of the first embodiment.

<Third Embodiment of Top Sheet ( Embodiment of the Present Invention) >
A sectional view of the third form of the top sheet 3 is shown in FIG. In this embodiment, the top sheet 3 has a structure in which a heat-sealed nonwoven fabric layer 44 is laminated on the absorber side of two or more cotton nonwoven fabric layers (two layers in the figure).

The heat-sealed nonwoven fabric layer 44 is made hydrophilic by imparting a surface treatment to synthetic fibers such as olefins, polyesters, polyamides, etc., such as polyethylene or polypropylene, or composite fibers, copolymers, blends thereof, etc. with a hydrophilizing agent. It can be formed from natural fibers such as recycled fibers, rayon and cupra, and cotton . In the present invention, 70% by weight or more of the synthetic fiber imparted with hydrophilicity is included in the constituent fibers. As the fibers constituting the heat-sealing nonwoven fabric layer 44, any of long fibers, short fibers, or a mixture thereof can be used. The fineness is preferably 1.0 to 7.0 dtex.

The heat-sealed nonwoven fabric layer 44 can be formed by an appropriate processing 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, or a point bond method. The basis weight is preferably 10 to 30 g / m ² .
The other characteristics of this embodiment are the same as those of the first embodiment or the second embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be used for disposable absorbent articles in general such as sanitary napkins, panty liners, urine absorption pads, disposable diapers for absorbing menstrual blood, cages and the like.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Top sheet, 4 ... Lower layer absorber, 5 ... Upper layer absorber, 6 ... Intermediate sheet, 7 ... Side nonwoven fabric, 8 ... Embossed recessed part, 9 ... Back End-independent emboss, 41, 42, 43 ... cotton nonwoven fabric layer, 44 ... heat fusion nonwoven fabric layer, BS ... solid gather, W ... wing-shaped flap, WB ... buttocks side wing-shaped flap, P1, P2, P3 ... opening.

Claims (6)

In an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet disposed on the front surface side and a back sheet disposed on the back surface side,
The top sheet is made of a non-woven fabric including two layers of non-woven cotton layers formed from a fiber material containing 70% or more of cotton fibers.
Of the two cotton non-woven fabric layers, the upper layer contains a water repellent, the skin contact surface has a water absorption of 0 to 5 mm, and at least in the excretion opening portion, a large number of openings that penetrate the front and back are provided. And
The lower layer is more hydrophilic than the upper layer, does not have an opening larger than the size of the opening provided in the upper layer, and is configured to have a lower aperture ratio than the upper layer ,
A heat-fusible nonwoven fabric layer made of a fiber material containing 70% by weight or more of hydrophilic synthetic fiber is further laminated below the cotton nonwoven fabric layer of the nonwoven fabric constituting the topsheet, and the topsheet An embossed recess that bites into the absorbent body from the surface of was formed by thermocompression bonding ,
An absorbent article characterized by the above. The uppermost layer of the cotton nonwoven fabric layer has a thickness of 0.05 to 1.0 mm, a fiber basis weight of 10 to 30 g / m ² , an area of each opening of 0.5 to 8.0 mm ² , and an opening ratio of 15 to 65. %
The water repellent includes a stearic acid compound,
The amount of the water repellent added to the uppermost layer of the cotton nonwoven layer is 0.05 to 0.15 parts by weight with respect to 100 parts by weight of the fiber,
A sanitary napkin,
The absorbent article according to claim 1. The bottom layer of the cotton nonwoven fabric layer has a thickness of 0.05 to 1.0 mm, a fiber basis weight of 10 to 30 g / m ² , has no opening, and is configured not to contain a water repellent. The absorbent article according to 1 or 2 . The topsheet and the absorbent body are at least partially in direct contact;
The absorbent article in any one of Claims 1-3 in which the said absorber contains a heat-fusible fiber in the part which contacts the said top sheet at least. The absorbent body is wrapped in a packaging sheet;
The topsheet and the packaging sheet are at least partially in direct contact;
The absorptive article according to any one of claims 1 to 3 in which said packaging sheet contains heat-fusible fiber at least in a portion which contacts said top sheet. Non-woven fabric including two layers or three or more layers is formed by forming each non-woven fabric layer and superimposing them, and interlacing the fibers between the layers by a high-pressure water stream.
The absorbent article in any one of Claims 1-5 .

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