JP2006263296A - Absorbent article and surface sheet for absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the rigidity of a sheet from increasing and the cushioning properties from decreasing, and to more reduce skin contact area and to improve air permeability, and to obtain the drier sense of use. <P>SOLUTION: A first layer 1 and a second layer 2 are laminated, and the first layer 1 comprises a fiber aggregate, and a first compressed concave part 3 is formed over the first layer 1 and the second layer 2 with the a predetermined pattern, and a raised part 4 is formed by the first layer 1 at other parts except the first compressed concave part 3, and the second compressed concave part 5 is formed at the raised part 4 but comes short of the second layer 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, and a surface sheet used for a skin contact surface thereof.

  The surface sheet for absorbent articles requires the characteristics to smoothly transfer urine and menstrual blood discharges to the absorbent body, as well as the ability to prevent discomfort due to stuffiness and skin problems such as itchiness and fogging. Has been.

  For this reason, various types of surface sheets for absorbent articles have been proposed in which an uneven shape is formed on the surface of the absorbent article facing the wearer's skin (see, for example, Patent Documents 1 to 3). ) However, satisfactory results are still not obtained in terms of prevention of discomfort and skin troubles due to stuffiness.

  Therefore, in order to solve this problem, the first fiber layer and the second fiber layer are laminated and partially heat-sealed in a predetermined pattern, and the first and second fiber layers are formed by the first fiber layer. There has been proposed a surface sheet for absorbent articles in which a raised portion is formed in a portion other than the heat-sealed portion (Patent Document 4). According to this technique, the shape of the raised portion is effectively maintained by the rigidity of the heat-sealed portion, and the skin contact area can be reduced and the air permeability can be improved.

However, this technique has a problem that the effluent easily remains in the raised portion, and the residual effluent comes into contact with the skin, resulting in a sticky feeling and skin trouble.
Japanese Patent Laid-Open No. 9-111631 JP 2000-135239 A Japanese Patent No. 3181195 JP 2003-126147 A

  Then, the main subject of this invention is providing the technique which can obtain the use feeling still lighter and can reduce the risk of skin trouble.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article provided with a surface sheet that contacts the skin,
The top sheet is formed by laminating a first layer and a second layer, the first layer is made of a fiber assembly, and a first compression recess extending over the first layer and the second layer is formed in a predetermined pattern. The absorbent article is characterized in that a raised portion made of a first layer is formed in a portion other than the first compression recess, and a high-density portion having a fiber density higher than that of the surrounding is formed in the raised portion. .

<Invention of Claim 2>
The absorptive article according to claim 1 in which said high-density part is formed by forming the 2nd compression crevice which does not reach a 2nd layer in said bulge part.

<Invention of Claim 3>
The absorptive article according to claim 2 in which said 1st compression crevice and the 2nd compression crevice are formed with heat fusion.

<Invention of Claim 4>
The absorbent article according to claim 2 or 3, wherein the second compression recess is communicated with the first compression recess.

<Invention of Claim 5>
The absorbent article according to any one of claims 1 to 4, wherein the second layer is a film layer.

<Invention of Claim 6>
The absorptive article according to any one of claims 1 to 5 in which said 1st compression crevice is continuing over the whole parts other than said bulge part.

<Invention of Claim 7>
The first layer and the second layer are laminated, the first layer is made of a fiber assembly, and the first compression recesses extending in the first layer and the second layer are formed in a predetermined pattern. A surface sheet for absorbent articles, wherein a raised portion made of a first layer is formed in a portion other than the concave portion, and a high density portion having a higher fiber density than the surroundings is formed in the raised portion.

  In the present invention, in the top sheet, not only the raised portion is formed by the first compression recesses extending over the first layer and the second layer, but also the high density portion having a higher fiber density than the surroundings does not reach the raised portion, for example, to the second layer. Formed by the second compression recess. In this case, it becomes difficult for the high density portion to hold the discharged matter, and the occurrence of stickiness and skin troubles can be reduced. Further, when the high-density portion is formed by the second compression recess, the second compression recess does not reach the second layer, so that it is difficult to increase the rigidity of the seat and the cushioning property of the raised portion is hardly impaired. Therefore, while maintaining the seat rigidity and cushioning properties at the same level as the conventional example using only the first compression recess, it is possible to further reduce the skin contact area and improve the air permeability. Can be improved.

  The second layer may be a fiber layer, but in that case, the discharged matter is easily held in the second layer. Therefore, in this invention, it is preferable to make a 2nd layer into a film layer, to improve the diffusibility and permeability | transmittance of discharge | emission, and to promote the movement of the discharge | emission from a 1st layer to a 2nd layer. In this case, it is possible to more effectively prevent the exhausted matter from remaining in the first layer, and to further improve the smooth feeling.

  Moreover, the 2nd compression recessed part of this invention becomes shallow compared with a 1st compression recessed part. Therefore, the second compression recess is easily filled with discharge such as menstrual blood, which is likely to cause skin trouble. Therefore, in this case, it is desirable that the second compression recess is communicated with the first compression recess so that the discharge in the second compression recess is diffused into the first compression recess.

  Furthermore, if the discharge is filled in the first compression recess, skin trouble is likely to occur. Therefore, it is preferable that the first compressed concave portion is configured so that the discharged matter in the first compressed concave portion is diffused in a planar manner by continuing the entire portion other than the raised portion.

  Hereinafter, one embodiment of the present invention will be described in detail based on an application example to a sanitary napkin. However, the present invention absorbs and retains effluent from the human body such as urine and menstrual blood by absorbing it through the surface sheet. Needless to say, it can be applied to disposable diapers, sanitary napkins, incontinence pads, panty liners, and the like.

  FIG. 1 shows an example of a sanitary napkin, which has a structure in which an absorber 14 is interposed between a liquid-impermeable back sheet 11 and a liquid-permeable top sheet S. Around the absorbent body 14, the back sheet 11 and the top sheet S are joined together by an adhesive means such as a hot melt adhesive.

  As the back sheet 11, the liquid-impervious back sheet 2 is made of a sheet material having at least water shielding properties such as polyethylene, polypropylene, etc. In addition to this, the liquid-impervious back sheet 2 is substantially liquid-impervious through a waterproof film. After securing, a nonwoven fabric sheet (in this case, a waterproof film and a nonwoven fabric constitute a liquid-impermeable back sheet) and the like can be used. In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  As the absorbent body 14, for example, a material in which a highly water-absorbing resin is mixed in pulp, or a material in which chemical fibers are mixed in a pulp and a material having a highly water-absorbing resin is mixed is used. As shown in the figure, it is desirable that the absorbent body 4 is surrounded by the crepe paper 15 in order to maintain the shape and quickly diffuse menstrual blood and to prevent the menstrual blood once absorbed from returning. Pulp includes cellulose fibers such as chemical pulp and molten pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of Examples of the highly water-absorbing resin include polyacrylate cross-linked products, self-crosslinked polyacrylates, saponified acrylate-vinyl acetate copolymer cross-linked products, isobutylene / maleic anhydride copolymer cross-linked products, and polysulfone. Examples include cross-linked acid salts, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is preferably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  An intermediate sheet 16 (so-called second sheet) is interposed between the top sheet S and the absorbent body for the purpose of improving performance, such as improving the diffusibility of the discharged matter or preventing the return of the discharged matter. Can do. As the intermediate sheet 16, a regenerated fiber such as rayon or cupra or a natural fiber such as cotton is used so that the material itself has hydrophilicity, or an olefin such as polyethylene or polypropylene, a polyester, a polyamide, or the like. It is possible to use a fiber which has been subjected to surface treatment with a hydrophilizing agent to impart hydrophilicity. The intermediate sheet 16 can be laminated on the side surface of the absorbent body 14 of the top sheet S and integrated by hot melt adhesive or heat fusion.

  And the skin contact surface (surface contact | abutted to a wearer's skin) of an absorbent article is formed of the surface sheet S. FIG. 2 and 3 show a surface sheet example S according to the present invention, and the surface sheet S is formed by laminating a first layer 1 and a second layer 2. The first layer 1 is made of a fiber assembly, and the first compression recesses 3 are formed in a predetermined pattern so as to cover the first layer 1 and the second layer 2 in the thickness direction, and the first compression recesses 3 in the first layer 1 are formed. The other part is formed as a raised portion 4 that is relatively raised. A large number of the raised portions 4 are formed discontinuously on the surface directed to the skin side of the wearer, and the inside is filled with fibers constituting the first layer 1. In the illustrated example, the raised portions 2 have substantially the same shape and are arranged in a staggered manner.

  Furthermore, a second compression recess 5 that does not reach the second layer 2 is formed in the raised portion 4. The presence of the high-density portion in the vicinity of the second compression recess 5 makes it difficult for the body fluid to be retained in the raised portion 4, and can reduce the feeling of stickiness and skin trouble. Moreover, while ensuring cushioning property by the raised part 4, sufficient air permeability can be ensured through the first compression recessed part 3 and the second compression recessed part 5, and it becomes particularly excellent in a sense of smoothness as compared with the prior art. .

  The first compression recess 3 and the second compression recess 5 can be formed by compression processing such as embossing. These concave portions 3 and 5 can be formed by embossing once with the first layer 1 and the second layer 2 being laminated, or can be formed by separate embossing. In particular, when processing the first compression recess 3, the first layer 1 and the second layer 2 are heated, and at least one of the first layer 1 and the second layer 2 is melted to form a recess while thermally fusing both layers. It is preferable to do this. In this case, the heat-sealed portion and the vicinity thereof become highly rigid due to consolidation, and the shape of the raised portion 4 is sufficiently retained even under pressure. Further, in processing the second compression recess 5, it is preferable to perform heating and form the recess by thermal fusion. In this case, since the consolidation is less than that of the first compression recess 3, the improvement in rigidity is small. As a means for performing these heat-sealing, ultrasonic sealing can be used in addition to heat embossing.

  Although the thickness T1 of the topsheet 1 determined by the thickest part of the raised portion 4 can be determined as appropriate, it is preferably 0.5 to 10 mm, particularly preferably 1 to 5 mm. Moreover, although minimum thickness T2 of the bottom part of the 1st compression recessed part 3 can be defined suitably, it is 0.01-1 mm suitably, Especially preferably, it is 0.1-0.5 mm. Further, the minimum thickness T3 of the bottom of the second compression recess 5 can be appropriately determined within the range of the thickness of the first layer, but is preferably 0.01 to 0.5 mm, particularly preferably 0.1. ~ 0.3 mm. These thicknesses T1 to T3 mean thicknesses measured from a cross-sectional photograph or a cross-sectional image of the surface sheet in a non-pressurized state. The ratio of the thickness T2 of the first compression recess to the thickness T1 of the topsheet 1 is preferably 1 to 30%, particularly 2 to 10%, and the thickness of the second compression recess to the thickness T1 of the topsheet 1 The proportion of T2 is preferably 20 to 90%, particularly 20 to 50%.

  The distance between the ridges 4 and 4 in the longitudinal direction and the width direction of the absorbent article is determined by the width and length of the first compression recess 3, and the width and length of the first compression recess 3 are for forming this. It is determined by the width and length of the pressure convex portion (the convex portion of the emboss roll). In this case, the width W1 and the length L1 of the pressurizing convex portion can be determined as appropriate, but are preferably 0.5 to 15 mm, particularly preferably 1 to 10 mm. The width W1 and the length L1 can be the same or different.

  The second compression recess 5 is preferably formed so that at least a part thereof is located at the top of the raised portion 4. The planar dimension of the second compression recess 5 can be determined as appropriate within the range of the planar dimension of the raised portion 4, and is preferably as large as possible from the viewpoint of reducing the skin contact area. The width W2 and length L2 of the second compression recess 5 are determined by the width and length of the pressure projection for forming the second compression recess 5, and the width W2 and length L2 can be determined as appropriate. Is 0.5 to 15 mm, particularly preferably 1 to 10 mm.

  The shape of the second compression recess 5 may be circular, but the raised portion 4 is equally divided like a groove extending toward the first compression recess 3, for example, the cross shape shown in the figure. Thus, it is preferable to form a groove shape extending radially from the center of the raised portion 4. As a result, the discharge in the second compression recess 5 easily flows into the deeper first compression recess 3. From this viewpoint, it is particularly preferable that the second compression recess 5 communicates with the first compression recess 3 as shown in FIG. Further, in order to diffuse the discharge in the first compression recess 3, as shown in FIG. 5, the first compression recess 3 is continuous over the entire region other than the raised portion 4, in other words, all the first It is also a preferable form that the one compression recessed part 3 is connected. Further, in the illustrated embodiment, the linear first compression recesses 3 are arranged in a staggered manner or in a continuous honeycomb shape, so that the planar shape of the raised portion becomes a hexagonal shape, but is not limited thereto. Alternatively, other appropriate shapes such as a circular shape (three-dimensionally a dome shape) can be formed by making the first compression concave portion 3 into a dot shape.

The number of the first compression recesses 3 is preferably 1 to 30 / cm ² , particularly preferably 5 to 20 / cm ² . Moreover, the number of the 2nd compression recessed parts 5 is 1-8 per cm < ² >, and especially 1-5 are preferable.

  The first layer 1 in the present invention is formed of a fiber assembly. Although it does not specifically limit as a constituent fiber of the 1st layer 1, The fiber which consists of a thermoplastic polymer is suitable. Examples of the thermoplastic polymer include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and polyamides. A core-sheath type composite fiber or a side-by-side type composite fiber made of a combination of these thermoplastic polymers can also be used. Furthermore, these thermoplastic polymer fibers can be mixed with fibers other than thermoplastic polymers, such as water-absorbing fibers such as rayon, cotton, and hydrophilic acrylic fibers.

  The second layer 2 in the present invention can be formed of a fiber assembly or a film. As the constituent fiber of the fiber assembly, a fiber made of a thermoplastic polymer can be suitably used. Specific examples of this fiber are the same as those of the first layer 1, but also fibers having heat shrinkage, for example, an eccentric core-sheath type composite fiber or side-by-side type composite containing two types of thermoplastic polymer materials having different shrinkage rates. A fiber made of fibers can also be suitably used.

  On the other hand, the film constituting the second layer 2 is not particularly limited as long as it can pass through the discharged matter. However, a breathable film, a perforated film, a net-like film, a composite of these, or a fiber with these A complex with an aggregate or the like can be used. By using the film, the effect of the present invention becomes more remarkable.

  When the first layer 1 and, if necessary, the second layer 2 are formed of a fiber assembly, the fiber assembly is formed by a wet method, a dry method, a spun lace method, a spun bond method, a melt blow method, a needle punch method, a stitch Nonwoven fabrics produced by various manufacturing methods such as the bond method can be used.

The basis weight of the first layer 1 can be determined as appropriate, but is preferably 5 to 60 g / m ² , particularly preferably 10 to 40 g / m ² . Moreover, when forming the 2nd layer 2 with a fiber assembly, it is preferable that the basic weight shall be 5-50 g / m < ² >, especially 10-30 g / m < ² >. Furthermore, it is preferable that the basic weight as the whole surface sheet 1 shall be 15-200 g / m < ² >, especially 30-150 g / m < ² >.

(Other)
One or more additional layers can be provided on the opposite side of the second layer 2 from the first layer 1. The material of this layer can be selected from the fiber material and film material described above, and can be the same as or different from the first layer 1 and the second layer 2.

  Moreover, when providing the above-mentioned intermediate sheet 16, the above-mentioned 1st and 2nd compression recessed part can also be formed by embossing etc. in the lamination | stacking state which accumulated the surface sheet S and the intermediate sheet 16. FIG.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a surface sheet that makes contact with a human body and allows discharges from the human body to pass through in absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, and panty liners.

It is a principal part fracture perspective view of the absorptive article concerning the present invention. It is sectional drawing of the surface sheet which concerns on this invention. It is a top view of the surface sheet concerning the present invention. It is a top view of the surface sheet concerning the present invention. It is a top view of the surface sheet concerning the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st layer, 2 ... 2nd layer, 3 ... 1st compression recessed part, 4 ... Raised part, 5 ... 2nd compression recessed part, S ... Top sheet.

Claims (7)

In an absorbent article provided with a surface sheet that contacts the skin,
The top sheet is formed by laminating a first layer and a second layer, the first layer is made of a fiber assembly, and a first compression recess extending over the first layer and the second layer is formed in a predetermined pattern. The absorbent article is characterized in that a raised portion made of a first layer is formed in a portion other than the first compression recess, and a high-density portion having a fiber density higher than that of the surrounding is formed in the raised portion. .   The absorbent article of Claim 1 in which the said high-density part is formed by forming the 2nd compression recessed part which does not reach a 2nd layer in the said protruding part.   The absorptive article according to claim 2 in which said 1st compression crevice and the 2nd compression crevice are formed with heat fusion.   The absorbent article according to claim 2 or 3, wherein the second compression recess is communicated with the first compression recess.   The absorbent article according to any one of claims 1 to 4, wherein the second layer is a film layer.   The absorptive article according to any one of claims 1 to 5 in which said 1st compression crevice is continuing over the whole parts other than said bulge part.   The first layer and the second layer are laminated, the first layer is made of a fiber assembly, and the first compression recesses extending in the first layer and the second layer are formed in a predetermined pattern. A surface sheet for absorbent articles, wherein a raised portion made of a first layer is formed in a portion other than the concave portion, and a high density portion having a higher fiber density than the surroundings is formed in the raised portion.

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