JP2016067613A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesion between respective layers, for promoting transition of a body liquid, and suppress reversion of the body liquid to a front face side.SOLUTION: Plural first embossments 20, 20 are provided with intervals from an outer face side of a second sheet 6, in a state that the second sheet 6 is laminated to an absorber 4, thereby first high adhesion areas 22 where the second sheet 6 is tightly adhered to the absorber 4 are formed between adjacent first embossments 20, 20. In addition, in a state that a liquid transmissive front face sheet 3 is laminated to the second sheet 6, from an outer face side of the liquid transmissive front face sheet 3, second embossments 21 are provided on at least both sides of the first embossments 20 and on positions not overlapping to the first embossments 20, so that, second high adhesion areas 23 where the liquid transmissive front face sheet 3 is tightly adhered to the second sheet 6, are formed between adjacent second embossments 21, 21.SELECTED DRAWING: Figure 4

Description

  The present invention provides absorbent articles such as sanitary napkins, panty liners and incontinence pads for absorbing menstrual blood and vaginal discharge, and more embossing for the purpose of improving the drawing of bodily fluids into the absorbent body. It is related with the absorbent article which gave.

  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 surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

  Numerous improvements have been made to this type of absorbent article to improve liquid permeability and make it easier to draw body fluid into the absorbent body. What has been given is known.

  For example, in Patent Document 1 below, a liquid-permeable top sheet having an opening penetrating in the thickness direction, and provided in a position in the thickness direction with respect to the opening of the top sheet, penetrates in the thickness direction. Or a liquid-retaining absorber having an opening that extends in the thickness direction and does not penetrate, wherein the topsheet is the absorber in the opening of the topsheet and the opening of the absorber. An absorbent article is disclosed in which the opening diameter of the opening on the clothing side surface of the top sheet is smaller than the opening diameter of the opening on the skin side surface of the absorbent body.

  Moreover, in the following patent document 2, the absorber has a high basis weight region and a low basis weight region whose basis weight is relatively lower than the high basis weight region, and the low basis weight region is a high basis weight region. The surface sheet has a plurality of hook-shaped protrusions formed on the skin contact surface side so as to surround the quantity region, and in a recess between the protrusions in a plan view of the surface sheet An absorbent article is disclosed in which openings with a small amount of fiber or in the thickness direction of the topsheet are formed.

  Further, in Patent Document 3 below, a liquid-permeable thermoplastic synthetic resin sheet that extends substantially parallel to the surface sheet is interposed in the middle of the thickness direction of the liquid-absorbent core, and the thermoplastic synthetic resin sheet has a large number of transparent sheets. An absorbent article having a hole and a flexible peripheral wall extending in a direction from the upper surface to the lower surface of the sheet at the periphery of the through hole is disclosed.

JP2013-212250A JP 2012-239721 A Japanese Patent No. 3363312

  However, in the absorbent articles described in Patent Documents 1 to 3, the liquid permeability is enhanced by providing an opening in the sheet, but in the region other than the opening, the surface sheet and the absorber or the surface sheet and the intermediate are provided. Since the adhesiveness between the sheet and the intermediate sheet and the absorbent body is low, there is a problem that the body fluid is difficult to transfer between these layers.

  Moreover, when the hole is provided in the sheet, there is a problem that the body fluid absorbed by the absorbent body easily returns from the hole to the surface side.

  Then, the main subject of this invention is providing the absorbent article which made the adhesiveness between each layer improved and promoted the transfer | transfer of a bodily fluid, and made it hard to produce the return to the surface side.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and a hydrophilic property is provided between the liquid-permeable surface sheet and the absorbent body. In the absorbent article in which the second sheet of the nature is arranged,
In the state where the second sheet is laminated on the absorber, a large number of first embosses are provided at intervals from the outer surface side of the second sheet, so that the second sheet between the adjacent first embosses is the absorber. A first high adhesion region is formed on the second sheet, and the liquid permeable surface sheet is laminated on the second sheet from the outer surface side of the liquid permeable surface sheet on at least both sides of the first emboss. A second high adhesion region is formed in which the liquid-permeable surface sheet between the adjacent second embosses is brought into close contact with the second sheet by providing a second emboss at a position that does not overlap the first emboss. An absorbent article is provided which is characterized in that

  In the first aspect of the present invention, since the first emboss is first applied from the outer surface side of the second sheet, the body fluid can be drawn from the second sheet to the absorbent body at the first emboss. Further, by providing a large number of the first embosses at intervals, a first high adhesion region is formed in which the second sheet between the adjacent first embosses is in close contact with the absorber, so that they are adjacent to each other. Even between the first embosses, the transfer of body fluid from the second sheet to the absorber is promoted.

  Furthermore, since the second emboss is provided from the outer surface side of the liquid-permeable surface sheet, the drawing of body fluid from the liquid-permeable surface sheet to the second sheet and the absorber is improved in the second emboss. At the same time, by providing a large number of the second embosses at intervals, a second high adhesion region is formed in which the liquid-permeable surface sheet between the adjacent second embosses is in close contact with the second sheet. The transition of body fluid from the liquid-permeable surface sheet to the second sheet is also promoted between the adjacent second embosses.

  In this way, the body fluid is absorbed and retained in the absorber by enhancing the adhesion between the liquid-permeable surface sheet and the second sheet and between the second sheet and the absorber to promote the transition of the body fluid. Therefore, there is no liquid residue between the layers, and it is difficult for the liquid to return to the surface side.

  Further, the first emboss acts as a temporary storage space for body fluid, and the body fluid collected in the first emboss is absorbed and held by the absorber, so that it is difficult for the first emboss to return to the surface side.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the first emboss and the second emboss are provided in a range including a region corresponding to a body fluid discharge site.

  In the invention according to the second aspect, since the first emboss and the second emboss are provided in a range including a region corresponding to a body fluid discharge site where it is necessary to quickly transfer the body fluid to the absorber, the body fluid is applied to the absorber. In addition to being surely transferred, it is ensured that the return to the surface side is less likely to occur.

  According to a third aspect of the present invention, there is provided the absorbent article according to any one of the first and second aspects, wherein the first emboss is a linear emboss that is long in the longitudinal direction of the absorbent article.

  In the invention according to claim 3, by making the first embossed linear emboss long in the longitudinal direction of the absorbent article, the adhesion between the second sheet and the absorbent can be improved reliably, and the second sheet Therefore, the transferability of body fluid from the body to the absorber can be reliably improved. Moreover, a large body fluid storage space can be formed by the first embossing.

  As the present invention according to claim 4, there is provided the absorbent article according to any one of claims 1 to 3, wherein the second emboss is circular or elliptical or oval long in the longitudinal direction of the absorbent article.

  In the invention according to claim 4, the second embossing to be applied to the outer surface side of the liquid-permeable surface sheet is formed into a circular shape or an oval shape or an oval shape that is long in the longitudinal direction of the absorbent article, thereby directly touching the skin. It makes it hard to feel the embossing hardness.

  As the present invention according to claim 5, a plurality of the first embosses are alternately arranged in a staggered manner at intervals in the width direction and the longitudinal direction of the absorbent article, and the second embosses are on both sides of the first emboss. The absorption according to any one of claims 1 to 4, wherein a large number of staggered staggers are arranged at intervals in the width direction and the longitudinal direction of the absorbent article by being disposed at positions that do not overlap with the first embossing. A sex article is provided.

  The invention according to claim 5 is an arrangement pattern of the first embossing and the second embossing according to the first embodiment, and a plurality of staggered arrangements are alternately arranged at intervals in the width direction and the longitudinal direction of the absorbent article. Is. Thereby, the effect which embossed more reliably by the number of small embosses comes to be exhibited.

  As a sixth aspect of the present invention according to claim 6, a large number of the first embosses are arranged in a lattice shape so as to be arranged at intervals in the width direction and the longitudinal direction of the absorbent article, and the second embosses are the first embosses. Either of the first to fourth arrangements are arranged in a grid so as to be aligned at intervals in the width direction and the longitudinal direction of the absorbent article by being arranged at positions that do not overlap the first embossing on both sides of the absorbent article. An absorbent article as described in 1 above is provided.

  The invention according to claim 6 is an arrangement pattern of the first emboss and the second emboss according to the second embodiment, and a large number of them are arranged in a lattice shape so as to be aligned at intervals in the width direction and the longitudinal direction of the absorbent article. It is arranged. As a result, the emboss can be arranged over almost the entire predetermined area.

  As described above in detail, according to the present invention, the adhesion between the layers is improved, the transfer of the body fluid can be promoted, and the return to the surface side is less likely to occur.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is an expanded sectional view (III-III line arrow view of FIG. 1) of a bodily fluid discharge part corresponding | compatible area | region. (A)-(C) are sectional drawings which show the embossing process. FIG. 3 is a plan view of the first emboss 20. FIG. 4 is a cross-sectional view showing an emboss pin 24 for a first emboss 20. 3 is a plan view of a second emboss 21. FIG. FIG. 5 is a cross-sectional view showing an emboss pin 25 for a second emboss 21. FIG. 4 is a plan view showing the arrangement positions of the first emboss 20 and the second emboss 21. It is an expanded view of the sanitary napkin 1 which concerns on a 2nd form example.

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

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a permeate that quickly permeates menstrual blood or a cage. In order to maintain the shape of the absorbent body 4 and improve the diffusibility, if necessary, the liquid surface sheet 3, the absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2, 3 The crepe paper 5 surrounding the absorbent body 4, the hydrophilic second sheet 6 disposed between the liquid-permeable surface sheet 3 and the absorbent body 4, and disposed on both sides of the surface along the longitudinal direction. The side nonwoven fabrics 7 and 7 are formed. Further, in the periphery of the absorbent body 4, at the front and rear end edges in the longitudinal direction of the napkin, the outer edge portion of the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is an adhesive such as hot melt or heat seal. The liquid-impervious back sheet 2 and the side nonwoven fabric 7 which are joined by an adhesive means such as the like and are extended laterally from the edge of the absorbent body 4 at both side edges thereof. The outer periphery flap part which does not have the absorber 4 is formed in the outer periphery by joining by adhesion | attachment means, such as a heat seal. Moreover, the embossing groove | channel 10 is formed so that the blood drainage part H may be enclosed by the embossing from the surface side (skin contact surface side) of the said liquid-permeable surface sheet 3. FIG. The crepe paper 5 is provided as necessary and may be omitted.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

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

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 is, for example, a mixture of a highly water-absorbent resin in pulp, or a mixture of chemical fibers in the pulp and a high water absorption. A material mixed with a conductive resin is used. As shown in the figure, it is desirable that the absorbent body 4 is surrounded by crepe paper 5 in order to maintain its shape and quickly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. Further, as the absorber 4, an air-laid absorber that can reduce the bulk may be used.

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

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process 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 highly water-absorbent resin is desirably 10 to 60% of the weight of the absorber. 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.

  When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like.

  On the other hand, side nonwoven fabrics 7 and 7 are provided on both side portions on the surface side of the sanitary napkin 1 along the longitudinal direction and over almost the entire length of the napkin 1, respectively. Wing-like flaps W and W are formed by a part of the liquid-impervious back sheet 2 that extends laterally and also laterally.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.

  As shown in FIG. 2, the inner side of the side nonwoven fabric 7 folds the side nonwoven fabric 7 almost double, and inside the double sheet, in the middle in the height direction, as appropriate at both ends or in the longitudinal direction. One or a plurality of, in the illustrated example, two thread-like elastic elastic members 8 and 8 are arranged, and the double sheet portion is raised on the surface side by the contraction force. Is formed.

[Embossed groove 10]
As shown in FIG. 1, an embossed groove 10 is formed on the surface side of the liquid-permeable surface sheet 3 so as to surround the blood outlet H.

  The embossed grooves 10 can be provided in various plane patterns. In this example, as shown in FIG. 1, a central emboss 11 having a generally oval closed shape that is long in the longitudinal direction of the napkin so as to surround the blood discharge port H, and a front side of the central emboss 11. The front emboss 12 having a substantially inverted U shape that is spaced apart and the blood drainage port H side is spaced apart in the width direction and the rear embossment 12 that is spaced apart from the central embossing 11 are spaced apart, and the blood drainage port H side is wide. The rear embossing 13 having a substantially U shape that is spaced apart in the direction and the both sides of the central embossing 11 are spaced apart from the central embossing 11 in the width direction, are substantially along the longitudinal direction, and the central embossing 11 It is comprised from the both-side embossing 14 and 14 substantially parallel to the both sides.

  The embossing groove 10 in the illustrated example will be described in more detail. The central embossing 11 makes the region surrounded by the central embossing 11 easier to adhere to the blood drainage port of the wearer, and in the lateral direction and the front-rear direction of the body fluid. Is to prevent side leakage and front-rear leakage. The front embossing 12, the rear embossing 13, and the both side embossing 14, 14 receive the body fluid that has diffused beyond the central embossing 11 to the front, rear, or both sides in the width direction, respectively. This is to prevent leakage of body fluid.

  The central emboss 11 has a substantially oblong shape that is long in the longitudinal direction of the napkin in a region including at least the blood drainage port H, preferably in a longitudinal region that is substantially the same as or longer than the wing-shaped flap W as shown in FIG. , Oval or oval. The groove width of the embossed groove may be the same throughout, but the groove width of the part extending in the substantially longitudinal direction on both sides may be made smaller than the groove width of the front and rear arc-shaped parts as shown in the example of the drawing. Good.

  The front embossing 12 is formed in an arc shape that bulges to the front side of the napkin, and both end portions on the rear side are spaced apart in the width direction, and extend substantially outward in the width direction from both end portions. It is formed in a U-shaped (substantially Ω-shaped) pattern. The clearance width of the arcuate portion in the napkin width direction is formed to be approximately equal to the clearance width of the central emboss 11 in the napkin width direction, and body fluid diffused to the front side of the central emboss 11 can easily enter the front emboss 12. ing. The groove width of the front emboss 12 is formed to be substantially equal throughout.

  The rear emboss 13 is formed in an arc shape that bulges to the rear side of the napkin, and both front end portions are spaced apart in the width direction, and extend substantially outward in the width direction from both end portions. It is formed in a U-shaped (substantially inverted Ω shape) pattern. The rear embossing 13 is formed longer in the napkin longitudinal direction than the front embossing 12 in order to prevent leakage of the buttocks and the like so that body fluid can be received in a wider range in the napkin longitudinal direction. It has become. The groove width of the rear emboss 13 is also formed almost equally throughout.

  The embosses 14 and 14 on both sides are linear embossed grooves substantially along the longitudinal direction of the napkin, and are provided between the central embossed 11 and the three-dimensional gather BS formed by the side nonwoven fabric 7. The groove widths of the embosses 14 on both sides are formed almost equally throughout.

[Embossing to form high adhesion area]
Next, the embossing provided in order to improve the adhesiveness of the absorber 4 and the 2nd sheet | seat 6, and the adhesiveness of the 2nd sheet | seat 6 and the liquid-permeable surface sheet 3 is demonstrated. In the sanitary napkin 1, as shown in FIG. 1, a large number of first embosses 20, 20... Are intermittently applied to a predetermined region from the outer surface side of the second sheet 6, and the liquid-permeable surface sheet. .. Are provided intermittently from the outer surface side. By providing these embosses 20 and 21, the adhesion between the sheet material to which each emboss is applied and the lower layer member is enhanced.

  Specifically, in the sanitary napkin 1, as shown in FIG. 4 (A), the second sheet 6 is laminated on the skin side surface of the absorbent body 4 surrounded by the crepe paper 5. From the outer surface side of the second sheet 6, a plurality of first embosses 20, 20... Are provided at intervals in the napkin width direction and the longitudinal direction, so that the second sheet 6 between the adjacent first embosses 20, 20 is provided. A first high adhesion region 22 in close contact with the absorber 4 (crepe paper 5) is formed.

  In the first high adhesion region 22, the second sheet 6 is stretched by the pressing force of the first embosses 20, 20 in the region sandwiched between the adjacent first embosses 20, 20, and the second sheet 6 is stretched by the tension. The second sheet 6 is a region that is pressed to the absorber 4 side and is in close contact with the absorber 4 (crepe paper 5) at a higher density than the other regions.

  In this way, by providing the first embosses 20, 20... From the outer surface side of the second sheet 6, the drawing of body fluid from the second sheet 6 to the absorber 4 side in the first emboss 20 is improved, The absorbent body 4 is quickly absorbed and held. Moreover, since the 1st high contact | adherence area | region 22 is formed between the adjacent 1st embossing 20 and 20, the transfer of the bodily fluid from the second sheet | seat 6 of this area | region to the absorber 4 comes to be accelerated | stimulated.

  After the first embossing 20 is applied, as shown in FIG. 4 (B), in the state where the liquid-permeable surface sheet 3 is laminated on the skin side surface of the second sheet 6, the pressing of the first embossing 20, 20,. Due to the force, the surface of the second sheet 6 around the first emboss 20 sinks to the first emboss 20 side, so that a gap is formed between the liquid-permeable surface sheet 3 and the second sheet 6. In the state where such a gap exists, there is a problem that the body fluid is likely to remain on the surface side because the body fluid does not easily transfer from the liquid-permeable surface sheet 3 to the second sheet 6.

  Therefore, in the sanitary napkin 1, the liquid-permeable surface sheet 3 is laminated on the skin side surface of the second sheet 6, as shown in FIG. 4C, from the outer surface side of the liquid-permeable surface sheet 3. The liquid-permeable surface sheet 3 between the adjacent second embosses 21 and 21 is formed by applying the second emboss 21 to at least the both sides of the first emboss 20 and not overlapping the first emboss 20. A second high adhesion region 23 is formed in close contact with the second sheet 6.

  In the second high adhesion region 23, the liquid-permeable surface sheet 3 is stretched by the squeezing force of the second embosses 21, 21 in the region sandwiched between the adjacent second embosses 21, 21, and the tension is made transparent. The liquid surface sheet 3 is pressed against the second sheet 6 side, and the liquid permeable surface sheet 3 is in close contact with the second sheet 6 at a higher density than other regions. The second high adhesion region 23 is formed on both sides of the first emboss 20, and the first emboss 20 is a space where the liquid-permeable surface sheet 3 does not contact the second sheet 6.

  By providing the second embosses 21, 21... From the outer surface side of the liquid permeable surface sheet 3, body fluid is drawn from the liquid permeable surface sheet 3 to the second sheet 6 and the absorber 4 side in the second emboss 21. improves. Moreover, since the 2nd high contact | adherence area | region 23 is formed between the 2nd embossing 21 and 21 which adjoins, the liquid-permeable surface sheet 3 and 2nd of the part in which the surface of the 2nd sheet | seat 6 sank by the said 1st embossing 20 was carried out. Adhesion with the sheet 6 is improved, and the transfer of body fluid from the liquid-permeable surface sheet 3 to the second sheet 6 is promoted.

  As described above, in the sanitary napkin 1, the adhesion between the liquid-permeable surface sheet 3 and the second sheet 6 and between the second sheet 6 and the absorbent body 4 is enhanced to promote the transfer of body fluid. By doing so, the body fluid is absorbed and held in the absorbent body 4, so that there is no liquid residue between the layers and it is difficult for the liquid to return to the surface side.

  The concave portion formed by the first emboss 20 acts as a temporary storage space for body fluid, and the body fluid accumulated in the first emboss 20 penetrates the inner surface (second sheet 6) of the first emboss 20. Therefore, the absorption speed of the body fluid is improved and the body fluid does not easily return to the surface side.

  As shown in FIG. 1, the first emboss 20 and the second emboss 21 are preferably provided in a range including a region corresponding to the blood drainage port H. In the example shown in FIG. 1, it is formed within the range surrounded by the central emboss 11 surrounding the blood drainage port H. Thereby, in the area | region which needs to transfer body fluid to the absorber 4 quickly, while a body fluid can transfer to the absorber 4 reliably, it becomes difficult to produce the reverse to the surface side. In addition, you may form the said 1st embossing 20 and the 2nd embossing 21 over the whole range which the absorber 4 interposes.

  As shown in FIG. 3, the first emboss 20 is an emboss that is squeezed from the outer surface side of the second sheet 6 to a predetermined depth of the absorber 4. A plurality of the first embosses 20 are provided at intervals in the napkin longitudinal direction and the width direction. Although the second sheet 6 is stretched by the squeezing force of the first emboss 20, the second sheet 6 is not torn and an opening is not formed, and the concave portion formed by the first emboss 20 has the entire surface. Covered with a second sheet 6. The first emboss 20 is provided with a depth that does not penetrate the absorber 4.

  As shown in FIGS. 1 and 5, the first emboss 20 is preferably formed in a straight line (rectangular shape) long in the napkin longitudinal direction in plan view. Thereby, the adhesiveness between the second sheet | seat 6 and the absorber 4 can be improved reliably, and the transferability of the bodily fluid from the second sheet | seat 6 to the absorber 4 comes to improve reliably. Moreover, a temporary storage space for bodily fluids can be formed large, and the absorption efficiency of bodily fluids can be improved. In addition, although the hardness of embossing increases by making the 1st embossing 20 linear, there is a concern about the bad influence on the feeling of touch, but since the liquid-permeable surface sheet 3 is laminated on the outer surface side of the second sheet 6, The first emboss 20 does not affect the feeling of touch.

The planar dimensions of the first embossing 20 (the dimensions of the embossed depression bottom), as shown in FIG. 5, the longitudinal dimension _{L 20} is 5 mm to 15 mm, preferably better to the 8 mm to 12 mm, the short dimension _{W 20} Is 0.5 mm to 5 mm, preferably 2 mm to 4 mm.

  As shown in FIG. 3, the cross-sectional shape of the first emboss 20 is preferably such that the bottom surface of the embossed recess is substantially flat. Thereby, a tension | tensile_strength can be firmly applied to the 2nd sheet | seat 6 at the time of embossing pressing, and the 2nd sheet | seat 6 between the adjacent 1st embossing 20 and 20 can be closely_contact | adhered to the absorber 4 side now. Moreover, when using the 1st embossing 20 as a temporary storage place of a bodily fluid, since a storage space is formed exactly, it becomes easy for a bodily fluid to infiltrate.

In order to provide the first emboss 20 having such a cross-sectional shape, it is preferable to use an embossed pin 24 having a cross-sectional inverted trapezoidal shape with a flat tip as shown in FIG. The width W ₂₄ of the tip of the embossed spin is 0.5 mm to 5 mm, preferably 1 mm to 2 mm. The embossed spin height H ₂₄ (the embossed depth of the first emboss 20) is 1 mm to 5 mm, preferably 2 mm to 4 mm.

Further, as shown in FIG. 9, the pitch PL ₂₀ in the napkin longitudinal direction, which is the separation distance in the napkin longitudinal direction between the centers of the adjacent first embosses 20 and _20, is 6.5 mm to ₂₀ mm, preferably 12 mm to 14 mm. The pitch PW ₂₀ in the napkin width direction, which is the separation distance between the centers in the napkin width direction, is 3.5 mm to 25 mm, preferably 12 mm to 14 mm.

  Next, as shown in FIG. 3, the second emboss 21 is an emboss that is squeezed from the outer surface side of the liquid-permeable surface sheet 3 to a predetermined depth of the absorbent body 4. A large number of the second embosses 21 are formed at intervals in the longitudinal direction and the width direction of the napkin. The second embossing 21 is provided on at least both sides of the first embossing 20 at a position that does not overlap with the first embossing 20 at a distance. In the example shown in FIG. 1, one second emboss 21 is provided on each side of the first emboss 20 in the napkin width direction. Instead, the second emboss 21 is in the napkin longitudinal direction with respect to the first emboss 20. May be provided on both sides of the napkin, or on both sides in the napkin width direction and on both sides in the napkin longitudinal direction. In addition, between the adjacent first embosses 20, 20, one second emboss 21 located on both sides of both the first embosses 20, 20 is provided in the central portion between these first embosses 20, 20. The second emboss 21 is common.

  Although the liquid-permeable surface sheet 3 is stretched by the squeezing force of the second emboss 21, the liquid-permeable surface sheet 3 is not torn and an opening is not formed, but a recess formed by the second emboss 21. The surface is covered with the liquid-permeable surface sheet 3 over the whole. The second emboss 21 is provided with a depth that does not penetrate the absorber 4. The second emboss 21 may be formed with the same depth as the first emboss 20, or may be shallower or deeper than this.

  As shown in FIGS. 1 and 7, the second emboss 21 is preferably formed in a circular shape in plan view. It is also possible to form an ellipse or an ellipse that is long in the longitudinal direction of the napkin. By making the 2nd emboss 21 circular, it is made hard to feel the hardness of the emboss at the time of touching skin directly.

The planar dimensions of the second embossing 21 (the dimensions of the groove bottom surface), as shown in FIG. 7, the napkin longitudinal dimension _{L 21} is 1 mm to 5 mm, preferably better to the 2 mm to 4 mm, the napkin width direction dimension _{W 21} is 1 mm to 5 mm, and it is preferably a 2 mm to 4 mm.

  The cross-sectional shape of the second emboss 21 is preferably formed in a dome shape having a semicircular bottom surface, as shown in FIG. Thereby, while being able to reduce the influence of the hardness when an emboss touches skin directly, the tear of the liquid-permeable surface sheet 3 at the time of giving the 2nd emboss 21 can be prevented.

In order to apply the second emboss 21 having such a cross-sectional shape, it is preferable to use an emboss pin 25 having a hemispherical tip as shown in FIG. The diameter W ₂₅ of the embossed spin ₂₅ is 0.5 mm to 3 mm, preferably 1 mm to 2 mm. The height H ₂₅ of the embossed spin ₂₅ (the embossed depth of the second emboss 21) is 2 mm to 5 mm. The thickness is preferably 2 mm to 4 mm.

Further, the pitch PL ₂₁ in the napkin longitudinal direction, which is a separation distance in the napkin longitudinal direction between the centers of the adjacent second embosses 21 and 21, is 6.5 mm to ₂₀ mm, preferably 12 mm to 14 mm, similarly to the PL _20. The pitch PW ₂₁ in the napkin width direction, which is the separation distance between the centers in the napkin width direction, is 3.5 mm to 25 mm, preferably 12 mm to 14 mm, similarly to the PW ₂₀ described above.

  Next, the relative positional relationship between the first emboss 20 and the second emboss 21 will be described. As shown in FIG. 9, the gap between the first emboss 20 and the second emboss 21 is the longitudinal direction of the napkin. The separation distance SL is 3 mm to 10 mm, preferably 5 mm to 7 mm, and the separation distance SW in the napkin width direction is 1.5 mm to 5 mm, preferably 2 mm to 3 mm.

  By the way, the arrangement pattern of the first emboss 20 and the second emboss 21 can be staggered as shown in FIG. Specifically, a large number of the first embosses 20 are alternately arranged in a staggered manner at intervals in the napkin width direction and the longitudinal direction, and the second embosses 21 are first embosses on both sides of the first emboss 20. By disposing at a position that does not overlap 20, it is possible to obtain a pattern in which a large number of staggered patterns are alternately arranged at intervals in the napkin width direction and the longitudinal direction. By arranging in a staggered manner, the effect of embossing more reliably with a small number of embossments is exhibited.

  Further, as a second form example of the arrangement pattern of the first emboss 20 and the second emboss 21, as shown in FIG. 10, the first emboss 20 is spaced in the napkin width direction and the longitudinal direction in each direction. A large number of grids are arranged so as to be aligned, and the second embosses 21 are arranged at positions where they do not overlap the first embosses 20 on both sides of the first emboss 20, so that there is a gap in the napkin width direction and the longitudinal direction. A large number of patterns can be arranged in a lattice pattern so as to be aligned. By arranging in this lattice shape, embossing can be arranged over almost the entire predetermined area. In the example shown in FIG. 10, the first embosses 20 are provided in 3 rows in the napkin width direction and 5 rows in the napkin longitudinal direction, and the second embosses 21 are 4 rows in the napkin width direction and 5 rows in the napkin longitudinal direction. Is provided.

  In order to further enhance the adhesion between the members, after applying the second emboss 21..., A process of bringing the members into close contact with each other by applying pressure from the outer surface side of the liquid-permeable surface sheet 3 with a flat roll. You may give it. Thereby, in the area | region which provided the said 1st embossing 20 and the 2nd embossing 21, while the adhesiveness of the liquid-permeable surface sheet 3 and the second sheet 6 and the adhesiveness of the second sheet 6 and the absorber 4 side further increase. In other regions, the adhesion between the members increases, and the body fluid easily moves between the members.

In order to demonstrate the improvement effect of the amount of reversion by the sanitary napkin 1 according to the present invention, the sanitary napkin 1 (Example), a napkin that is provided with only the first emboss and not the second emboss (Comparative Example 1), and The amount of reversion was measured for three types of napkins (comparative example 2) without the first embossing and the second embossing. The said Example, the comparative example 1, and the comparative example 2 shall be the napkin which consists of the same raw material, and only the presence or absence of the said embossing differed. The specifications of each material are as follows.
Liquid-permeable surface sheet: air through, basis weight 25 g / m ²
Second seat: Air-through, basis weight 18g / m ²
Absorber: pulp basis weight 300 g / m ² , polymer basis weight 70 g / m ²
Crepe paper: basis weight 13.5 g / m ²
The measurement method was that 3 cc of artificial menstrual blood (viscosity 8) at 37 ° C. was dropped on the surface of the liquid-permeable surface sheet of each napkin, and 3 cc of the same artificial menstrual blood was dropped at the same position after 2 minutes. After being allowed to stand for 4 minutes, four filter papers were laminated at the dropping position and a weight of 100 g (5 g / cm ² ) was placed for 5 minutes, and then the amount of change in the weight of the filter paper was measured and used as the reversal amount. In the measurement, three napkins for each condition were prepared, and the average value of three measurements was obtained. The artificial menstrual blood used was a component of 100 ml of glycerin, 4.6 g of CMC (carboxymethylcellulose sodium), 875 ml of purified water, 10 g of sodium chloride, and 10.7 g of sodium carbonate.

The results are shown in Table 1. As a result of Table 1, in Comparative Example 1 in which only the first emboss is provided, the amount of reversion 13% is improved as compared with Comparative Example 2 in which no emboss is provided (reverse is less likely to occur). In addition, in the sanitary napkin 1 (Example) provided with the first emboss 20 and the second emboss 21, the effect of improving the reversal amount by 32% as compared with Comparative Example 2 was obtained.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 10 ... Embossed groove, 11 ... Center emboss, 12 ... Front embossing, 13 ... Rear embossing, 14 ... Both sides embossing, 20 ... First embossing, 21 ... Second embossing, 22 ... First high adhesion region, 23 ... Second high adhesion region, 24, 25 ... Embossing pin

Claims (6)

In an absorbent article in which an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and a hydrophilic second sheet is disposed between the liquid-permeable surface sheet and the absorbent body,
In the state where the second sheet is laminated on the absorber, a large number of first embosses are provided at intervals from the outer surface side of the second sheet, so that the second sheet between the adjacent first embosses is the absorber. A first high adhesion region is formed on the second sheet, and the liquid permeable surface sheet is laminated on the second sheet from the outer surface side of the liquid permeable surface sheet on at least both sides of the first emboss. A second high adhesion region is formed in which the liquid-permeable surface sheet between the adjacent second embosses is brought into close contact with the second sheet by providing a second emboss at a position that does not overlap the first emboss. Absorbent article characterized by being made.   The absorbent article according to claim 1, wherein the first emboss and the second emboss are provided in a range including a region corresponding to a body fluid discharge site.   The absorbent article according to claim 1, wherein the first emboss is a linear emboss that is long in the longitudinal direction of the absorbent article.   The absorbent article according to any one of claims 1 to 3, wherein the second emboss is a circle or an ellipse or an oval long in the longitudinal direction of the absorbent article.   A plurality of the first embosses are alternately arranged in a staggered manner at intervals in the width direction and the longitudinal direction of the absorbent article, and the second embosses are positions that do not overlap with the first embosses on both sides of the first embossment. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is arranged in a staggered manner at intervals in the width direction and the longitudinal direction of the absorbent article.   A large number of the first embosses are arranged in a lattice shape so as to be aligned in the width direction and the longitudinal direction of the absorbent article, and the second embosses overlap the first embosses on both sides of the first embosses. The absorptive article according to any one of claims 1 to 4, wherein a large number of the absorptive articles are arranged in a lattice shape so as to be arranged at intervals in the width direction and the longitudinal direction of the absorptive article.

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