JP2018149046A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve texture of a liquid permeable surface sheet, to quickly absorb body fluid, and to remove stickiness of the surface.SOLUTION: A liquid permeable surface sheet 3 is formed into a rugged shape where projections 10 and recesses 11 extending in a longitudinal direction of a sanitary towel 1 are arranged by turns in a width direction of the sanitary towel 1, and rectangular holes 12 are formed on side surfaces of the projections 10. A second sheet 6 is disposed on a non-skin side of the liquid permeable surface sheet 3. In the projections 10, the liquid permeable surface sheet 3 is separated from the second sheet 6 and pleat-like parts whose cross sections are almost Ω-shaped are formed, and the liquid permeable surface sheet 3 and the second sheet 6 are bonded in the recesses 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, and the like. Specifically, a liquid-permeable surface sheet is formed in an uneven shape, and an opening is provided on a side surface of the uneven portion. The present invention relates to an absorbent article.

  Conventionally, as the absorbent article, a cotton-like pulp or the like between a liquid-impervious back sheet made of a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable front sheet made of a nonwoven fabric or a permeable plastic sheet, etc. The thing which interposed the absorber which consists of is known.

  With respect to the liquid-permeable surface sheet, conventionally, for the purpose of improving the touch and reducing the irritation to the skin and increasing the cushioning property, or reducing the contact area with the skin, the sticky feeling and the moist feeling are suppressed. Correspondingly, those formed in an uneven shape have been proposed.

  For example, in the following Patent Document 1, a convex portion protruding to the first surface side and a groove portion recessed to the second surface side are provided, and the convex portion is extended toward the first direction of the surface of the nonwoven fabric. And a plurality of rows are provided at predetermined intervals in a second direction orthogonal to the first direction on the surface of the non-woven fabric, and the groove is formed in the space between the convex portions adjacent to the second direction. And extending in one direction, and having a bottom portion located on the second surface side of the groove bottom portion of the groove portion and discontinuously provided in the first direction. In addition, a nonwoven fabric for absorbent articles is disclosed in which a plurality of recesses are provided, and at least a part of the peripheral surface of the recesses includes a hole that communicates with the second surface.

  Further, in Patent Document 2 below, the first nonwoven fabric and the second nonwoven fabric laminated together are partially heat-sealed to form a sheet-forming fused portion, and the first nonwoven fabric is fused to the sheet-forming material. Projecting in a direction away from the second non-woven fabric in the non-fused part surrounded by the part, the inside is forming a number of hollow convex parts, the fused part for forming the sheet is inside the contour, A through hole having an outer peripheral edge having a shape similar to the shape of the contour, and the first nonwoven fabric and the second nonwoven fabric at a portion between the contour and the outer peripheral edge of the through hole in the fused portion for sheet formation A three-dimensional sheet in which is bonded is disclosed.

Japanese Patent No. 5829326 Japanese Patent No. 5960775

  However, in the thing of the said patent document 1, since the recessed part hollow from the groove bottom part is formed in the groove bottom part of the nonwoven fabric formed in uneven | corrugated shape, and the hole is formed in the surrounding surface of this recessed part, When pressure is applied, the hole formed in the recess is easily closed, and the effect of allowing body fluid to pass through the hole cannot be expected. For this reason, the absorption speed of a bodily fluid becomes slow, the liquid remains on the surface, and the user may feel sticky, which is not fully satisfied.

  Further, in the three-dimensional sheet described in Patent Document 2, since the concave and convex portions are provided with through holes, body fluid can be quickly passed through the through holes, but the through holes are formed in the concave portions, Since it faces the absorber, the bodily fluid that has once passed through the through-hole tends to return to the surface again through the through-hole, and there is a risk that the surface may become sticky due to the returned bodily fluid.

  Generally, there are many circular holes provided to improve the liquid permeability of the liquid-permeable surface sheet. However, when menstrual blood with high viscosity passes through the circular hole, There is a problem that a meniscus is easily formed in the opening, and this meniscus hinders passage of body fluid.

  Then, the main subject of this invention is providing the absorbent article which absorbed the bodily fluid quickly while eliminating the stickiness of the surface while making the touch of a liquid-permeable surface sheet favorable.

In order to solve the above problems, as the present invention according to claim 1, in the absorbent article provided with a liquid-permeable surface sheet on the skin contact surface side,
The liquid-permeable surface sheet is formed in a concavo-convex shape in which a plurality of convex portions and concave portions extending in the longitudinal direction of the absorbent article are alternately arranged in the width direction of the absorbent article, and a rectangular shape is formed on the side surface of the convex portion. There is provided an absorbent article characterized in that an opening is formed.

  In the first aspect of the present invention, since the liquid-permeable surface sheet is formed in a concavo-convex shape, the contact area of the liquid-permeable surface sheet with the skin can be reduced and the touch can be improved.

  In addition, since the liquid-permeable surface sheet has an opening formed in the side surface of the convex portion of the concavo-convex shape, the body fluid passes through the liquid-permeable surface sheet through the opening, so that the body fluid is quickly absorbed, Surface stickiness is less likely to occur. Since the opening is formed on the side surface of the convex part, compared to the conventional one formed on the bottom surface of the concave part, the once absorbed body fluid is less likely to return through the opening, and the surface stickiness is further prevented. It can be done.

  Furthermore, since the opening is formed in a rectangular shape, a meniscus is hardly formed in the opening due to the surface tension of the body fluid passing through the opening, and the opening is not blocked by the meniscus, so that the body fluid opens smoothly. Can pass through the hole. For this reason, bodily fluids can be absorbed quickly and surface stickiness is less likely to occur.

  As a second aspect of the present invention, a second sheet is disposed on the non-skin side of the liquid-permeable surface sheet, and the liquid-permeable surface sheet is separated from the second sheet at the convex portion and has a substantially Ω-shaped cross section. The absorbent article according to claim 1, wherein the permeable portion is formed and the liquid-permeable surface sheet and the second sheet are joined in the concave portion.

  In the second aspect of the present invention, as a specific example of forming the liquid-permeable surface sheet in a concavo-convex shape, a second sheet is disposed on the non-skin side of the liquid-permeable surface sheet, and the liquid-permeable surface is formed at the convex portion. The sheet is separated from the second sheet to form a bowl-shaped portion having a substantially Ω-shaped cross section, and the liquid-permeable surface sheet and the second sheet are joined in the concave portion. Since the concavo-convex convex portion is composed of a bowl-shaped portion having a substantially Ω-shaped cross section, it has excellent cushioning properties and can be further improved in touch, and the body pressure is applied to reduce the spacing between adjacent convex portions. Even when there is a body fluid that is reversed, the body fluid can be prevented from coming into contact with the skin surface, and stickiness of the surface can be further reduced.

  According to a third aspect of the present invention, the convex portion is formed in a cross-sectional shape having a maximum width in the middle of the height direction connecting the base end and the tip end of the convex portion, and the base end is higher than the height having the maximum width. The absorbent article according to any one of claims 1 and 2, wherein the opening is formed in a side portion.

  The invention described in claim 3 shows the relationship between the cross-sectional shape of the convex portion and the position of the opening. Examples of the convex portion formed in the cross-sectional shape having the maximum width in the middle of the height direction connecting the base end and the distal end of the convex portion include those composed of the above-described hook-shaped portion having a substantially Ω-shaped cross section. it can. With respect to the convex portion formed in such a cross-sectional shape, the opening is formed in a portion closer to the base end side than the height having the maximum width, so that the body fluid flowing into the concave portion can be quickly absorbed through the opening. , Surface stickiness can be suppressed more reliably.

  The present invention according to claim 4 provides an absorbent article according to any one of claims 1 to 3, wherein a separation height between a lower end of the opening and a base end of the convex portion is 0 to 1 mm. .

  In the invention of claim 4, the opening is formed in the vicinity of the base end of the convex portion so that the body fluid that has flowed into the concave portion can be quickly absorbed through the opening without collecting on the surface of the concave portion. Yes.

  As this invention which concerns on Claim 5, the said opening is formed in the rectangular shape whose width dimension is 2-4 mm and whose height dimension is 0.5-1.5 mm. An absorbent article is provided.

  In the invention described in claim 5, a meniscus is generated in the opening when the body fluid passes through the opening by forming the cross-sectional shape of the opening in a rectangular shape having a predetermined width and height. This can be reliably suppressed and the passage of body fluids can be prevented from being inhibited by the meniscus.

  As described above in detail, according to the present invention, the touch of the liquid-permeable surface sheet is improved, body fluid can be absorbed quickly, and surface stickiness can be eliminated.

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. 3 is an enlarged perspective view of a liquid-permeable surface sheet 3. FIG. 3 is an enlarged cross-sectional view of a liquid permeable top sheet 3. FIG. 2 is a schematic diagram showing a manufacturing apparatus 20. FIG.

  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. The liquid surface sheet 3, the absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving the diffusibility. And wrapping sheet 5 made of crepe paper or non-woven fabric, and side sheets 7 and 7 disposed along the longitudinal direction on both sides on the skin contact surface side. 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 sheet 7 which are joined by joining means such as an ultrasonic seal and which extend laterally from the side edges of the absorbent body 4 at both side edges thereof are hot-melted. The outer periphery flap part in which the absorber 4 does not exist is formed in the outer periphery by bonding means such as an adhesive, heat seal, ultrasonic seal or the like.

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.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp. In addition, those mixed with a superabsorbent resin are used. As shown in the figure, the absorbent body 4 is formed by an encapsulating sheet 5 made of crepe paper or non-woven fabric in order to quickly retain shape, diffuse menstrual blood, etc., and prevent reversal of once absorbed menstrual blood. It is surrounded. 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. Moreover, as the absorbent body 4, an airlaid absorbent body that can reduce the volume, or a polymer sheet in which a superabsorbent resin is disposed between two nonwoven fabric layers 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 preferably 5 to 60% of the weight of the absorber. When the content of the superabsorbent resin is less than 5%, 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.

  As the encapsulating sheet 5 surrounding the absorbent body 4, crepe paper such as thin paper or tissue paper or non-woven fabric can be used. The fiber material constituting the crepe paper is preferably made of 100% pulp fiber, and is preferably softwood pulp and hardwood pulp used for thin paper and tissue paper. For the hydrophilicity, a spunbond nonwoven fabric or an SMS nonwoven fabric (SMS, SSMMS, etc.) is suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. When providing the encapsulating sheet 5 surrounding the absorbent body 4 as in this example, as a result, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4, A body fluid is quickly diffused by the encapsulating sheet 5 having excellent absorbability, and reversal of menstrual blood and the like is prevented.

  On the other hand, side sheets 7 and 7 are provided on both sides of the sanitary napkin 1 on the skin contact surface side along the longitudinal direction and over the substantially entire length of the napkin 1, respectively. Wings-like flaps W, W projecting outward on both sides of the main body part by part of the liquid-impervious back sheet 2 extending partly laterally and also laterally extending. Is formed. The wing-shaped flaps W, W are used by being folded outward at the fold line RL (FIG. 1) of the base end portion so that the crotch portion of the underwear is wound when worn, and the impermeable back surface of the wing-shaped flap W The anti-slip adhesive layer (not shown) provided on the outer surface of the sheet 2 is attached to the outer surface of the underwear, thereby preventing misalignment with the underwear.

  As the side sheet 7, a water-repellent nonwoven fabric or a hydrophilic nonwoven fabric can be used from the viewpoint of important functions. 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.

[Liquid-permeable surface sheet 3]
Hereinafter, the liquid-permeable surface sheet 3 will be described in detail. The liquid-permeable surface sheet 3 is preferably a porous or non-porous nonwoven fabric. 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 non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. 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 be suitably used.

  In the sanitary napkin 1, the liquid-permeable surface sheet 3 has a convex portion 10 and a concave portion 11 extending in the longitudinal direction of the sanitary napkin 1, as shown in FIGS. 3 and 4. It is formed in the uneven | corrugated shape alternately arranged by the direction, and the rectangular-shaped opening 12 is formed in the side surface of the said convex part 10. It is characterized by the above-mentioned. Each of the convex portions 10 and the concave portions 11 extends in the longitudinal direction of the sanitary napkin 1 and is formed over the entire length of the liquid-permeable surface sheet 3. A plurality of rows are alternately arranged in the width direction of the sanitary napkin 1. As a result, the liquid-permeable surface sheet 3 is formed in an uneven shape (wave shape) along the width direction of the sanitary napkin 1 (in a cross-sectional view along the width direction of the sanitary napkin 1). Here, the opening 12 is formed on the side surface of the convex portion 10. The liquid permeability that the opening 12 constitutes the convex portion 10 in a cross-sectional view of the liquid-permeable surface sheet 3 shown in FIG. 4. It means that it is provided on each of the left and right sides with the apex of the convex portion 10 in the height direction as a boundary.

  The convex portion 10 is a portion in which the liquid-permeable surface sheet 3 protrudes from the member disposed on the non-skin side of the liquid-permeable surface sheet 3 to the skin side and is formed hollow.

  The concave portion 11 is a portion formed so as to be recessed relatively to the non-skin side from the top of the convex portion 10 and the non-skin side surface is in contact with a member disposed on the non-skin side of the liquid-permeable surface sheet 3. is there.

  The opening 12 provided in the convex part 10 penetrates the skin side of the liquid-permeable surface sheet 3 and the hollow interior of the convex part 10 in the thickness direction of the liquid-permeable surface sheet 3. 3 is a portion where no material constituting 3 is interposed. A plurality of the openings 12 are formed on both side surfaces of the convex portion 10 at predetermined intervals along the direction in which the convex portion 10 extends (longitudinal direction of the sanitary napkin 1).

  When the liquid-permeable surface sheet 3 is formed in a concavo-convex shape, the top of the convex portion 10 contacts the skin surface, and the contact area to the skin surface is reduced. The skin is less irritating and has better tactile sensation. Moreover, since the inside of the convex part 10 is formed in hollow, cushioning property is good and a soft touch feeling comes to be obtained.

  Moreover, since the said liquid-permeable surface sheet 3 has several rectangular opening 12,12 ... along the longitudinal direction of the sanitary napkin 1 in the side surface of the uneven | corrugated shaped convex part 10, these are formed. The body fluid is quickly absorbed on the side of the absorber 4 through the apertures 12, so that the stickiness of the surface does not occur. Since the opening 12 is formed on the side surface of the convex portion 10 and faces the inside of the convex portion 10 formed in a hollow shape, the bodily fluid once absorbed compared to the conventional one formed at the bottom of the concave portion Is difficult to reverse through the opening 12, and the surface can be prevented from sticking.

  Further, since the opening 12 is formed in a rectangular shape having corners, the body fluid passes through the opening 12 and has a surface tension when the body fluid passes through the opening 12 as compared with a circular shape. A meniscus that closes the body is difficult to form, and body fluid can pass through the aperture 12 smoothly. As a result, body fluid is quickly absorbed and surface stickiness is less likely to occur.

  The structure of the liquid-permeable surface sheet 3 formed in the concavo-convex shape will be described in more detail. As shown in FIGS. 3 and 4, the second sheet 6 is disposed on the non-skin side of the liquid-permeable surface sheet 3. In the convex portion 10, the liquid-permeable surface sheet is separated from the second sheet 6 to form a bowl-shaped portion having a substantially Ω-shaped cross section, and the liquid-permeable surface sheet 3 and the second sheet 6 are formed in the concave portion 11. Bonding is performed by a bonding means such as an adhesive such as hot melt, heat sealing, or ultrasonic sealing.

  By forming the concavo-convex convex portion 10 with a bowl-shaped portion having a substantially Ω-shaped cross section, the cushioning property and feel of the liquid-permeable surface sheet 3 are further improved, and it is adjacent when body pressure is applied. The interval between the convex portions 10 and 10 that match each other is reduced, so that body fluid remaining on the surface of the concave portion 11 or body fluid returning to the surface can be prevented from coming into contact with the skin surface, and stickiness of the surface is further less likely to occur.

  As shown in FIG. 4, the convex portion 10 formed of a bowl-shaped portion having a substantially Ω-shaped cross section has a maximum width A in the middle of the height direction connecting the base end and the distal end (top portion) of the convex portion 10. It is formed in a cross-sectional shape. That is, the separation width (maximum width A) of the liquid-permeable surface sheets 3 and 3 on both sides in the intermediate portion in the height direction is larger than the separation width B of the liquid-permeable surface sheets 3 and 3 on both sides at the base end. Formed (A> B). The cross-sectional shape of the convex portion 10 is formed such that the separation width of the liquid-permeable surface sheets 3 and 3 constituting both side surfaces of the convex portion 10 is gradually increased from the base end toward the skin side. In the middle of the direction, it has a maximum width A that maximizes the separation width, and further toward the skin side, the separation width gradually decreases, and the liquid-permeable surface sheets 3, 3 on both sides at the top of the convex portion 10. Is formed to connect.

  The maximum width A is preferably 1.5 to 3.0 mm, and the base end separation width B is preferably 0.5 to 1.0 mm. If the maximum width A is smaller than 1.5 mm, the width of the convex portion 10 is too small to obtain a sufficiently satisfactory touch. If A is larger than 3.0 mm, the width of the convex portion 10 is too large, and it is difficult to obtain a cushion feeling due to the restoring force of the material. On the other hand, if the separation width B of the proximal end is smaller than 0.5 mm, the proximal end of the convex portion 10 becomes unstable, the convex portion 10 is likely to fall down, and a soft touch feeling cannot be obtained. On the other hand, if the B is larger than 1.0 mm, the width of the convex portion 10 is too large and it is difficult to obtain a cushion feeling.

  The protruding height C of the convex portion 10 toward the skin side is 1.0 to 3.0 mm for the purpose of obtaining a soft touch and ensuring the shape retaining property of the convex portion due to the restoring force of the material. It is preferable to do this.

  On the other hand, the separation distance D (width of the concave portion 11) between the adjacent convex portions 10 and 10 is such that when the convex portion 10 is pushed from the top by body pressure, the adjacent convex portions 10 and 10 are reasonably attached. Therefore, it is preferable to set the thickness to 2.0 to 4.0 mm so that the body fluid on the surface of the recess 11 is less likely to come into contact with the skin surface.

  In the case where the cross-sectional shape of the convex portion 10 is formed in a shape having the maximum width A in the middle of the height direction, the opening 12 is formed in a portion closer to the proximal end than the height having the maximum width A, It is preferable not to form in the tip side (top side) part from the height having the maximum width A. In other words, the opening 12 is preferably formed within a range from the base end of the convex portion 10 having a substantially Ω-shaped cross section to a height having the maximum width A. Within this range, since the liquid-permeable surface sheet 3 constituting the convex portion 10 protrudes obliquely outward from the center of the convex portion 10, when viewed from the outer surface side of the liquid-permeable surface sheet 3. In addition, the opening 12 is formed at a position where it is difficult to see directly.

  By forming the opening 12 in the convex portion 10 on the proximal side from the height having the maximum width A, the body fluid on the surface of the recess 11 can easily pass through the liquid-permeable surface sheet 3 through the opening 12, and the body fluid is It can be absorbed quickly and the stickiness of the surface can be suppressed. Moreover, since the said opening 12 is provided in the range of the height which has the maximum width A from the base end of the convex part 10, when a body pressure is added to the top part of the convex part 10 at the time of mounting | wearing, adjacent convex parts 10 and 10 are deformed so as to be in contact with each other at the position of the maximum width A or in the vicinity thereof, the opening 12 does not directly touch the skin, and irritation to the skin by the end of the opening 12 can be prevented.

  In order to make it easier for the body fluid present on the surface of the recess 11 to pass through the liquid-permeable surface sheet 3 through the opening 12, the liquid permeability between the lower end of the opening 12 and the base end of the protrusion 10 is shown in FIG. 4. The separation height E in the protruding direction of the convex portion 10 along the conductive surface sheet 3 is preferably 0 to 1 mm. As a result, the opening 12 is formed in the vicinity of the base end of the convex portion 10, so that the body fluid that has flowed into the concave portion 11 does not accumulate on the surface of the liquid-permeable surface sheet 3 in the concave portion 11, and passes through the opening 12. Be absorbed quickly.

  As shown in FIG. 3, the shape of the opening 12 has a width dimension F (dimension in the direction in which the convex part 10 extends) of 2 to 4 mm and a height dimension G (dimension in the protruding direction of the convex part 10) of 0. It is preferable to form in a horizontally long rectangular shape of 5 to 1.5 mm. Thereby, generation | occurrence | production of the meniscus when a bodily fluid passes the opening 12 is suppressed reliably, and it can prevent that the passage of bodily fluids is inhibited by the meniscus.

  An interval H between the openings 12 and 12 adjacent to each other in the direction in which the convex portion 10 extends is preferably 1 to 2 mm. As a result, body fluid can easily pass through the opening 12 and the shape of the convex portion 10 can be stably formed.

  In order to manufacture the concavo-convex liquid-permeable surface sheet 3 having the above structure, as shown in FIG. 5, in the state where the concavo-convex liquid-permeable surface sheet 3 is stretched flat, the openings 12 are formed. Between the convex roll 21 in which a convex part with a rectangular tip is formed at a corresponding position and the concave roll 22 in which a concave part corresponding to the convex part of the convex roll 21 is formed, the liquid-permeable topsheet 3 Corresponds to the first step of passing the raw fabric and forming a large number of apertures 12 by meshing the convex portions of the convex roll 21 with the concave portions of the concave roll 22, and the convex portion 10 of the liquid-permeable surface sheet 3. The convex portions 23a, 23a,... Are along the circumferential direction of the roll, and a plurality of convex rolls 23 provided at predetermined intervals in the roll axis direction, and a plurality of concave portions 24a, 24a corresponding to the convex portions 23a of the convex roll 23. ... between the concave roll 24 formed with the front The liquid-permeable surface sheet 3 in which the opening 12 is formed in the first step is passed while being aligned to form the convex portion 10 and the concave portion 11, and the concave portion 11 is engaged with the convex portion 23 a of the convex roll 23. The second sheet 6 conveyed from another path in a stacked state is laminated, and the liquid-permeable surface sheet 3 and the second sheet 6 are placed between the tip of the convex part 23a of the convex roll 23 and the flat roll 25. The manufacturing apparatus 20 which consists of a 2nd process to join can be used.

  The liquid-permeable surface sheet 3 and the second sheet 6 can be joined using an adhesive such as hot melt, or a known joining means such as heat sealing or ultrasonic sealing.

  Then, the laminated body of the liquid-permeable surface sheet 3 and the second sheet 6 released from the convex portion 23a of the convex roll 23 is as shown in FIG. 4 due to the restoring force of the material at the portion protruding from the second sheet 6. A convex part 10 having a substantially Ω-shaped cross section is formed.

  In addition, the 2nd process remains in the state which wound the liquid-permeable surface sheet 3 which passed between the said convex roll 21 and the concave roll 22 and formed many apertures 12, 12, ... around the said concave roll 22. FIG. This is preferable because it is easy to align the position of the opening 12 and the concave portion 24a of the concave roll 24.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 6 ... Second sheet, 7 ... Side nonwoven fabric, 10 ... Convex part, 11 ... recess, 12 ... opening, 20 ... production device

Claims (5)

In the absorbent article provided with a liquid-permeable surface sheet on the skin contact surface side,
The liquid-permeable surface sheet is formed in a concavo-convex shape in which a plurality of convex portions and concave portions extending in the longitudinal direction of the absorbent article are alternately arranged in the width direction of the absorbent article, and a rectangular shape is formed on the side surface of the convex portion. An absorptive article characterized in that an opening is formed.   A second sheet is disposed on the non-skin side of the liquid-permeable surface sheet, and the permeable surface sheet is separated from the second sheet at the convex portion to form a hook-shaped portion having a substantially Ω-shaped cross section. The absorbent article according to claim 1, wherein the liquid-permeable top sheet and the second sheet are joined in the recess.   The convex portion is formed in a cross-sectional shape having a maximum width in the middle of the height direction connecting the base end and the tip end of the convex portion, and the opening is formed in a portion closer to the base end side than the height having the maximum width. The absorbent article according to any one of claims 1 and 2.   The absorbent article according to any one of claims 1 to 3, wherein a separation height between a lower end of the opening and a base end of the convex portion is 0 to 1 mm.   The said opening is an absorbent article in any one of Claims 1-4 currently formed in the rectangular shape whose width dimension is 2-4 mm and whose height dimension is 0.5-1.5 mm.

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