JP2017153628A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve characteristic of an absorbent article having a surface sheet with an uneven structure and suppression of breakage of a core wrap sheet.SOLUTION: An absorbent article comprises: a surface sheet 2; a rear surface sheet; an absorber core 403; and a core wrap sheet 401. The surface sheet comprises: plural fusion parts 21 extending in a longitudinal direction; and plural protrusion parts 11 formed between the adjacent fusion parts and protrude to a skin side and a non-skin side. A fine line-shaped adhesive 9 for connecting the surface sheet and the core wrap sheet forms prescribed patterns. The prescribed patterns comprise: lateral direction parts extending along a width direction, and connecting the fusion part and the protrusion part; and vertical direction parts extending along the longitudinal direction. The prescribed patterns are arranged along the longitudinal direction for forming a prescribed pattern row. The prescribed pattern rows are arranged in parallel in a width direction. On the protrusion part overlapped to the prescribed pattern row, a minimum value of a distance in the longitudinal direction between the adjacent lateral direction parts, is less than a distance in the width direction of one set of the protrusion part and the fusion part.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an absorbent article.

  In an absorbent article such as a disposable diaper provided with a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, a technique using a top sheet having an uneven structure is known. Here, the topsheet having a concavo-convex structure is recessed in the thickness direction, extends in the longitudinal direction, and is positioned between a plurality of recesses arranged in the width direction and adjacent recesses, and protrudes in the thickness direction and extends in the longitudinal direction. And a convex portion. Since the absorbent article provided with such a surface sheet has at least the following characteristics, it can be said that it is one of the preferred forms for the structure of the surface sheet. That is, the excrement hardly adheres to the skin when the excrement enters the recess, and the absorption of the excrement is promoted by increasing the surface area of the surface sheet, and the excrement in the recess diffuses along the longitudinal direction. Thus, the entire absorbent body can be used for absorbing excrement without waste, and the concave portion improves air permeability along the longitudinal direction, and the contact area with the wearer's skin is reduced by the amount of the concave portion. .

  For example, Patent Document 1 discloses an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet. In this absorbent article, the liquid-permeable surface sheet is made of a nonwoven fabric, and at least the absorbent article in the outer peripheral flap portion in which the liquid-permeable surface sheet and the back sheet are extended outward from the edge of the absorber. Each of the front and rear end portions is provided with an outer extending portion in which the liquid-permeable surface sheet extends outward from the edge of the back sheet. The liquid-permeable surface sheet is provided with a plurality of embossed recesses arranged along the substantially longitudinal direction of the absorbent article and at intervals in the width direction of the absorbent article in plan view. That is, the absorbent article of Patent Document 1 uses a topsheet having a plurality of (embossed) recesses extending in the longitudinal direction and a plurality of projections extending in the longitudinal direction between the plurality of recesses.

  As a method of manufacturing a surface sheet having such concave portions and convex portions, for example, a non-woven fabric is provided between an embossing roll in which wavy teeth are formed at a predetermined pitch along the width direction on the outer peripheral surface, and an anvil roll. A method of embossing with sandwiching is conceivable. By embossing, for example, a plurality of recesses extending in the transport direction (MD direction) are formed, and a plurality of projections are formed between adjacent recesses. Since the surface sheet having the concave portions and the convex portions formed by this method is low in cost, it can be said that it is one of the preferable forms as the structure of the surface sheet.

JP2013-154016A

  By the way, when the surface sheet having the concavo-convex structure (groove structure) is formed by embossing, in the width direction, the concave portion has almost no stretchability because the fibers are fused and fixed at high density. However, the convex portion has elasticity because the fibers are not fused to each other and are easily deformed at a low density. Therefore, the top sheet having the above configuration has stretchability in the width direction. When such a surface sheet is used for an absorbent article and the absorbent article is pulled in the width direction by use, the surface sheet is also pulled in the width direction, that is, stretched in the width direction under a tensile load in the width direction. . Here, the absorber includes an absorber core and a core wrap sheet that wraps the absorber core, and the top sheet and the core wrap sheet on the top sheet side (hereinafter also simply referred to as “core wrap sheet”) are bonded. It is joined with the agent. Therefore, the core wrap sheet is also stretched as the top sheet is stretched in the width direction. However, the core wrap sheet is formed of a tissue-like material due to demands such as absorbability and diffusibility, and such a material generally has little stretchability, and thus cannot stretch as much as a top sheet. For this reason, if the surface sheet is easily stretched and the amount of expansion is too large, the core wrap sheet cannot be sufficiently stretched, so that it cannot follow the elongation of the surface sheet and may break. If this happens, the superabsorbent polymer will come out of the absorbent core and then out of the topsheet, reducing the amount of absorption of the absorbent body and creating a space between the topsheet and the absorbent body. Absorption performance of an absorbent article will fall, such as the absorption rate of an absorber falling.

  An object of the present invention is to achieve both the characteristics of an absorbent article provided with a topsheet in which concave portions and convex portions extending in the longitudinal direction are alternately arranged and suppression of breakage of the top core wrap sheet in the absorbent article. It is in providing the absorbent article which can do.

The absorbent article of the present invention is as follows.
(1) A core wrap comprising a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, wherein the absorbent body wraps the absorbent core and the absorbent core. Sheet, and further comprising an adhesive that joins the surface sheet and the surface of the core wrap sheet on the surface sheet side, wherein the surface sheet has a longitudinal direction and the longitudinal direction. A plurality of fused portions extending in the longitudinal direction and arranged in parallel with each other at a predetermined interval in the width direction, and a width direction perpendicular to the longitudinal direction and a thickness direction perpendicular to the longitudinal direction and the width direction; A plurality of protrusions extending in the longitudinal direction between the adjacent fusion parts of the plurality of fusion parts and projecting to the skin side and the non-skin side of the fusion part in the thickness direction. The adhesive has a fine line shape, and The predetermined pattern is a lateral portion that extends along the width direction and connects at least one fusion part and a protrusion adjacent to the at least one fusion part. An angle formed by a tangent line at an arbitrary point of the fine line of the adhesive forming the predetermined pattern with respect to a virtual line parallel to the width direction is within 45 °, and extends along the longitudinal direction, An angle formed by a tangent line at an arbitrary point of an adhesive fine line forming the predetermined pattern with respect to an imaginary line parallel to the width direction, wherein the vertical direction part is connected at one end to one end of the horizontal part. At least one longitudinal portion greater than 45 °, and a plurality of the predetermined patterns are arranged along the longitudinal direction and form a predetermined pattern row continuously extending along the longitudinal direction. ,Previous The predetermined pattern row is arranged in parallel with each other in a plurality of rows in the width direction, and the projection portion overlapping the predetermined pattern row has a minimum length in a longitudinal direction between the lateral portions adjacent to each other in the longitudinal direction. The distance of is an absorbent article which is less than the distance in the width direction of one set of the protrusion and the fusion part.

In this absorbent article, while using the surface sheet in which the fusion part (concave part) and protrusion part (convex part) which are extended in a longitudinal direction are used alternately, the protrusion part which is easy to extend to the fusion part (concave part) which is hard to extend The (convex portion) is fixed at the lateral portion of the adhesive. Since the adhesive and the fused part are difficult to extend, the protrusions are difficult to extend even if they are to be extended, and therefore the surface sheet is difficult to extend as a whole. As a result, while utilizing the characteristics of the absorbent article having a topsheet in which concave and convex portions extending in the longitudinal direction are alternately arranged, the core wrap suppresses the extension of the topsheet to the tensile load on the topsheet. The sheet breakage can be suppressed. In other words, breakage of the core wrap sheet is suppressed at some sacrifice of the stretchability in the width direction of the top sheet.
However, if the interval between the lateral parts adjacent in the longitudinal direction is too wide, the protrusions can be prevented from extending in the region in the vicinity of the lateral part, but far from each lateral part, for example, the lateral direction in the longitudinal direction. In the intermediate region between the portions, the protruding portion may extend too much in the width direction. In that case, due to the extension of the protruding portion in the width direction, the vertical portion of the adhesive in the adjacent predetermined pattern row is pulled and moved in the width direction, and the core wrap sheet is dragged by the movement of the vertical portion, and the width direction There is a risk of breaking by being pulled by. That is, if the interval between the lateral portions adjacent to each other in the longitudinal direction is too wide, the extension of the protruding portion may not be sufficiently suppressed.
Therefore, in the present absorbent article, the minimum distance in the longitudinal direction between the lateral portions adjacent in the longitudinal direction in the predetermined pattern row of the adhesive is narrowed to be less than the width in the width direction of one set of the protruding portion and the fusion portion. doing. In this way, by narrowing the interval between the lateral portions, the surface sheet does not extend excessively even in the middle region between the lateral portions, and the extension of the protruding portion can be sufficiently suppressed. Thus, the elongation of the surface sheet can be sufficiently suppressed. As a result, even if the surface sheet is pulled in the width direction, the surface sheet does not extend so much in the width direction, that is, the core wrap sheet is hardly expanded.
Further, in the present absorbent article, due to the predetermined pattern (row) of the above-mentioned adhesive, the stretchability is sacrificed to some extent. Even when a tensile load is applied in the width direction, the degree of elongation is suppressed, and the characteristics of the absorbent article including the top sheet in which the concave portions and the convex portions are alternately arranged can be maintained.

(2) In the protruding portion overlapping the predetermined pattern row, the minimum distance among the distances in the longitudinal direction between the lateral portions adjacent in the longitudinal direction is a set of the protruding portion and the fusion portion. The absorbent article according to (1), which is less than the distance in the width direction.
In the present absorbent article, further, the maximum distance in the longitudinal direction between the lateral portions is made narrower than the width in the width direction of one set of the projecting portion and the fusion portion. Thus, by narrowing the space | interval of horizontal direction parts, expansion | extension of the area | region of the intermediate | middle of horizontal direction parts and extension of a protrusion part can be suppressed more reliably. Thereby, expansion | extension of a surface sheet can fully be suppressed and it can suppress that a core wrap sheet | seat fractures | ruptures.
However, if the core wrap sheet is partially broken in the middle region between the transverse parts in the longitudinal direction, if the distance between the transverse parts is large, the breakage will become too large to reach the lateral parts on both sides. In the case of a thin-line adhesive, it may be difficult to stop the extension of breakage.
However, in the present absorbent article, since the interval between the lateral portions is narrow as described above, the lateral portions on both sides are reached before the fracture becomes too large. Can be stopped. Thereby, even if a rupture occurs in a part of the core wrap sheet, the rupture can be suppressed to an extremely narrow range, so that the rupture as a whole can be suppressed.

(3) The absorbent article according to (1) or (2), wherein a fiber density of the protrusion on the core wrap sheet side is higher than a fiber density of the protrusion on the side opposite to the core wrap sheet side. .
In this absorbent article, due to the high fiber density of the core wrap sheet side protrusion, the adhesive penetrates deeply into the core wrap sheet side protrusion and binds very well to the core wrap sheet side protrusion. In this state, it can be bound with the core wrap sheet. Thereby, the expansion | extension in the width direction of a protrusion part can be suppressed more reliably with an adhesive agent, and the fracture | rupture of a core wrap sheet | seat can be suppressed more reliably by it.

(4) The plurality of fibers constituting the top sheet, according to any one of (1) to (3), wherein the fibers are fused at least at a part of intersections of the fibers. Absorbent article.
In the present absorbent article, since the fibers are fused at the intersection of the fibers, the extension of the protruding portion in the width direction can be more reliably suppressed by the fusion of the fibers in addition to the adhesive. As a result, breakage of the core wrap sheet can be more reliably suppressed.

(5) The absorbent article according to any one of (1) to (4), wherein a width of the protruding portion in the width direction is larger than a width of the fusion portion in the width direction.
In this absorbent article, since the width in the width direction of the protruding portion is large, the height in the thickness direction of the protruding portion can be increased, thereby absorbing the surface sheet in which concave portions and convex portions are alternately arranged. The characteristic of the property article can be exhibited more. Therefore, the elongation of the surface sheet can be suppressed and the breakage of the core wrap sheet can be suppressed while further utilizing the characteristics of the absorbent article including the surface sheet.

(6) The heights in the thickness direction of the protrusions on the core wrap sheet side are lower than the heights in the thickness direction of the protrusions on the side opposite to the core wrap sheet side. The absorbent article as described in any one of 1).
In the present absorbent article, since the protrusions have a low height in the thickness direction on the core wrap sheet side, the unevenness of the surface sheet on the core wrap sheet side is reduced, so the adhesive is applied to the surface sheet on the core wrap sheet side. Can be bound more reliably. As a result, the extension of the surface sheet can be more reliably suppressed, and thereby the break of the core wrap sheet can be more reliably suppressed.

(7) The density of the intersections at which the fibers in the protruding part on the core wrap sheet side are fused is the intersection point at which the fibers in the protruding part on the side opposite to the core wrap sheet side are fused. The absorbent article as described in said (6) higher than the density of.
In the present absorbent article, in the protruding portion, the density of intersections where the fibers on the core wrap sheet side are fused is high, that is, the relative movement of the fibers is difficult to suppress, thereby suppressing the extension of the protruding portion. be able to. Thereby, breakage of the core wrap sheet can be more reliably suppressed.

(8) Any one of the above (1) to (7), wherein the adhesive forms a plurality of closed regions surrounded by the thin-line adhesive by one or a plurality of the predetermined patterns. Absorbent article according to item.
In the present absorbent article, the region in which the protruding portion extends can remain in a narrow region called a closed region with respect to the expansion in the width direction. As a result, since the extension of the protrusion is limited, the extension of the protrusion in the width direction can be more reliably suppressed. Moreover, the range which the force which fractures | ruptures the core wrap sheet | seat by the expansion | extension of a protrusion part can be confined in the closed area | region. That is, even if a break occurs in the protrusion, it can remain in the closed region. Thereby, breakage of the core wrap sheet can be more reliably suppressed.

(9) The absorbent article according to any one of (1) to (8), wherein the predetermined pattern rows are arranged in parallel to each other in the width direction so as to overlap each other.
In the present absorbent article, since the predetermined pattern rows overlap each other, the density at which the adhesive is present in the protruding portion is increased, and thus the expansion in the width direction of the protruding portion can be more reliably suppressed. In addition, a plurality of closed regions can be formed by overlapping the predetermined pattern rows. Thereby, the area | region where a protrusion part is extended can remain in a closed area | region. By these, since expansion | extension of a surface sheet is restrict | limited, the fracture | rupture of a core wrap sheet | seat can be suppressed more reliably.

(10) The absorbent article according to any one of (1) to (9), wherein the predetermined patterns in the predetermined pattern row are arranged along the longitudinal direction so as to overlap each other.
In this absorptive article, since the density in which an adhesive exists in a projection part increases because a predetermined pattern overlaps, extension in the width direction of a projection part can be controlled more certainly. In addition, a plurality of closed regions can be formed by overlapping predetermined patterns with each other. Thereby, the area | region where a protrusion part is extended can remain in a closed area | region. By these, since expansion | extension of a surface sheet is restrict | limited, the fracture | rupture of a core wrap sheet | seat can be suppressed more reliably.

(11) The absorbent article according to any one of (1) to (10), wherein the predetermined pattern row includes an omega pattern, a wave pattern, or a spiral pattern.
In the present absorbent article, since the predetermined pattern row has an omega pattern, a wave pattern, or a spiral pattern, the fine-line adhesive can be evenly disposed between the top sheet and the core wrap sheet. Thereby, the expansion | extension in the width direction of a surface sheet can be suppressed uniformly, and, thereby, the fracture | rupture of a surface core wrap sheet | seat can be suppressed more reliably.

  According to the present invention, in the absorbent article, it is possible to achieve both the characteristics of the absorbent article provided with the surface sheet in which concave portions and convex portions extending in the longitudinal direction are alternately arranged and the suppression of the breakage of the surface core wrap sheet. It becomes possible to provide an absorbent article.

It is a top view of an absorptive article concerning an embodiment. It is an expanded sectional view which followed the II-II 'line | wire of FIG. 1 of the absorbent article which concerns on embodiment. It is an expanded sectional view showing a manufacturing method of a surface sheet of an absorptive article concerning an embodiment. It is a top view of a surface sheet and an absorber of an absorptive article concerning an embodiment. It is a perspective view of the surface sheet of the absorbent article which concerns on embodiment. It is an expanded sectional view in frame Q1 of Drawing 2 of an absorptive article concerning an embodiment. It is a schematic diagram explaining an example of the relationship between the surface sheet in the frame Q2 of FIG. 4 of the absorbent article which concerns on embodiment, and the predetermined pattern of an adhesive agent. It is a schematic diagram explaining the mechanism which produces the fracture | rupture of the absorbent article which concerns on embodiment. It is a schematic diagram explaining the conditions which suppress the fracture | rupture of the absorbent article which concerns on embodiment. It is a schematic diagram explaining the conditions which suppress the fracture | rupture of the absorbent article which concerns on embodiment. It is a schematic diagram explaining the other example of the relationship between the surface sheet in the frame Q2 of FIG. 4 of the absorbent article which concerns on embodiment, and the predetermined pattern of an adhesive agent. It is a schematic diagram explaining the further another example of the relationship between the surface sheet in the frame Q2 of FIG. 6 of the absorbent article which concerns on embodiment, and the predetermined pattern of an adhesive agent. It is a schematic diagram explaining the comparative example of the relationship between the surface sheet of an absorbent article, and the pattern of an adhesive agent.

  The absorbent article which concerns on this Embodiment is demonstrated with reference to drawings. The type and application of the absorbent article of the present invention are not limited to the examples, and for example, sanitary articles such as disposable diapers (tape type, pants type), sanitary napkins, panty liners, incontinence pads, sweat removing sheets, etc. Examples thereof include a sanitary product, which may be a human subject or a non-human animal such as a pet. The liquid to be absorbed by the absorbent article of the present invention is not particularly limited, and examples thereof include liquid excrement and body fluid of the wearer. Below, a disposable diaper (tape type) is taken as an example, and the absorptive article concerning this embodiment is explained.

  In the present specification, unless otherwise specified, viewing the absorbent article in a state of being expanded and flattened in the thickness direction from the upper surface side is simply referred to as “plan view”. Further, in the present specification, the “skin side” means a side closer to the skin surface of the wearer in the thickness direction of the absorbent article when the wearer of the absorbent article wears the absorbent article. In addition, the “non-skin side” means a side relatively far from the skin surface of the wearer in the thickness direction of the absorbent article when the wearer of the absorbent article wears the absorbent article. Means that.

  1 and 2 are views showing an absorbent article 1 (disposable diaper). Specifically, FIG. 1 shows a plan view of the absorbent article 1 in a developed state, and FIG. An enlarged sectional view of II ′ is shown. The absorbent article 1 has a longitudinal direction L, a width direction W orthogonal to the longitudinal direction L, and a thickness direction T orthogonal to the longitudinal direction L and the width direction W, and is located on the skin side of the wearer. A liquid-permeable top sheet 2, a liquid-impermeable back sheet 3 positioned on the non-skin side of the wearer, and an absorbent body 4 positioned between these two sheets are provided. The absorber 4 and the surface sheet 2 and the back surface sheet 3 are each joined by the adhesive.

  However, the longitudinal direction, the width direction, and the thickness direction of the top sheet 2, the back sheet 3, and the absorbent body 4 coincide with the longitudinal direction L, the width direction W, and the thickness direction T of the absorbent article 1, respectively. Therefore, in the top sheet 2, the back sheet 3, and the absorbent body 4, the longitudinal direction L, the width direction W, and the thickness direction T are respectively used with respect to the longitudinal direction, the width direction, and the thickness direction, and are relatively worn in the thickness direction. The skin side and the non-skin side are used for the side close to the person's skin and the side far from the person.

  The absorbent article 1 further extends and contracts in the longitudinal direction L each of the pair of leak-proof wall portions 5 and 5 formed of a pair of side sheets and the left and right leg surrounding portions that contact the thigh of the wearer. An elastic member 6 made of an elastic material such as rubber and a connecting tape 7 for connecting the abdomen region and the back region of the disposable diaper when worn are provided. The absorbent article 1 further includes an exterior sheet 8 on the non-skin side of the back sheet 3 to reinforce the back sheet 3 and improve the touch. The exterior sheet 8 is joined to the pair of leak-proof wall portions 5, 5 and the peripheral portion thereof while being joined to the non-skin side of the back sheet 3. In addition, the expansion-contraction member for expanding / contracting each of a pair of leak-proof wall parts 5 and 5 to the longitudinal direction L may be arrange | positioned at each of a pair of leak-proof wall parts 5 and 5. FIG.

  The back sheet 3 is provided on the non-skin side of the absorbent body 4 and prevents the discharged excretory liquid from permeating to prevent leakage to underwear or clothes. The back sheet 3 does not transmit liquid such as excretory liquid, but has predetermined air permeability. Thus, when the back sheet has air permeability, moisture released from the absorber to the non-skin side can be released through the back sheet, and is worn in the absorbent article or with the absorbent article. The moisture staying between the person's skin surface can be reduced. Moreover, in this Embodiment, the back surface sheet 3 is mutually joined in the state which pinched | absorbed the absorber 4 between the surface sheets 2, and the peripheral part, and liquid, such as excretion liquid, etc. Is configured not to leak outward.

  Examples of the material for the back sheet 3 include waterproof nonwoven fabric (for example, point bond nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, etc.), synthetic resin (for example, polyethylene, polypropylene, polyethylene terephthalate, etc.) film, nonwoven fabric, and the like. Examples include composite sheets with synthetic resin films. The material, thickness, basis weight, density, and the like of the back sheet 3 can be appropriately adjusted within a range in which leakage of liquid excretion absorbed and held by the absorber 4 can be prevented.

  The absorber 4 absorbs excretory fluids such as urine, and uses an absorbent material that absorbs and retains excreted fluids. Moreover, this absorber 4 is formed in the substantially rectangular shape long in the longitudinal direction L by planar view, and has fixed thickness. In addition, in another shape, for example, in plan view, both end sides in the longitudinal direction L are curved so as to protrude outward in the longitudinal direction L, and are formed in a substantially oval shape smaller than the top sheet 2 and the back sheet 3. It may be. The absorbent body 4 in the present embodiment has a flat shape both on the surface sheet side, that is, on the skin side surface and on the back sheet side, that is, on the non-skin side surface.

  The absorbent body 4 includes a liquid-permeable surface core wrap sheet 401 located on the wearer's skin side, a liquid-permeable or liquid-impermeable back core wrap sheet 402 located on the non-skin side of the wearer, and these It is located between the two sheets and includes an absorbent core 403 formed of an absorbent material. In the present embodiment, the front surface core wrap sheet 401 and the back surface core wrap sheet 402 are bonded to each other at their peripheral portions in a state where the absorbent core 403 is sandwiched between the both sheets, and the absorbent material or the like. Is configured not to leak outward. The front core wrap sheet 401 and the back core wrap sheet 402 may be configured to wrap the absorbent core 403 with a single member.

  The absorbent material contained in the absorbent core 403 is not particularly limited as long as it can absorb and retain the liquid excrement of the wearer. Examples of the absorptive material include water-absorbing fibers and highly water-absorbing materials (for example, highly water-absorbing resins and highly water-absorbing fibers). The absorptive material may contain an antiblocking agent, an ultraviolet absorber, a thickening branching agent, a matting agent, a colorant, and other various improving agents.

  Examples of water-absorbing fibers include wood pulp obtained from softwood or hardwood (for example, mechanical pulp such as groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp; kraft pulp, sulfide pulp, alkaline pulp, etc. Chemical pulp; semi-chemical pulp, etc.]; mercerized pulp or crosslinked pulp obtained by chemically treating wood pulp; non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (eg cotton linter); rayon, fibril Examples include regenerated cellulose such as rayon; semi-synthetic cellulose such as acetate and triacetate, but pulverized pulp is preferred because it is low in cost and easy to mold.

  Examples of the superabsorbent material include starch-based, cellulose-based, and synthetic polymer-based superabsorbent materials. Examples of starch-based or cellulose-based superabsorbent materials include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked products of sodium carboxymethyl cellulose, and synthetic polymers. Examples of high water-absorbing materials include polyacrylates, polysulfonates, maleic anhydrides, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates, polyglutamates , Polyalginate-based, starch-based, and cellulose-based superabsorbent polymers (SAP) and the like. Among these, polyacrylate-based (particularly, sodium polyacrylate-based) superabsorbent Resins are preferred. Examples of the shape of the superabsorbent material include particles, fibers, and scales.

The thickness, basis weight, and the like of the absorbent core 403 are not particularly limited, and may be appropriately adjusted according to characteristics (for example, absorbency, strength, lightness, etc.) that the absorbent body 4 (example: disposable diaper) should have. it can. For example, the thickness of the absorber 4 is usually in the range of 0.1 to 15 mm, preferably in the range of 1 to 10 mm, and the basis weight is usually in the range of ^{20 to} 1000 g / m ² , preferably Is in the range of 50 to 800 g / m ² . In addition, the thickness, basis weight, etc. of the absorber core 403 may be constant over the entire absorber 4, or may be partially different. In this Embodiment, it is constant over the absorber 4 whole.

  Further, the material of the front core wrap sheet 401 and the back core wrap sheet 402 is not particularly limited as long as it has liquid permeability and absorber core retention. Examples of the material of both sheets include known materials such as a tissue, a nonwoven fabric of hydrophilic fibers, and a hydrophilic nonwoven fabric made of hydrophilic processed fibers. From the viewpoints of low cost and absorbent retainability, a tissue formed from a pulverized pulp as a main material by a wet method is preferable.

The thickness, basis weight, fineness, fiber length, and the like of the front core wrap sheet 401 and the back core wrap sheet 402 are not particularly limited as long as they have liquid permeability and can hold the absorbent core 403. Absorbent articles A known value can be used. For example, the thickness of both sheets is in the range of 0.01 to 2 mm, preferably in the range of 0.05 to 1 mm, and the basis weight is in the range of 5 to 50 g / m ² , preferably 10-30 g / m ² . The fineness is usually 0.5 to 5 dtex, preferably 1.0 to 4.0 dtex, and the fiber length is usually 30 to 60 mm, preferably 35 to 55 mm. In the present embodiment, the thickness, basis weight, fineness, fiber length and the like of both sheets are constant throughout the absorbent body 4. However, the thickness, basis weight, fineness, fiber length, etc. of both sheets may be partially different.

  The top sheet 2 is provided on the skin side of the absorbent body 4, abuts against the skin of the wearer, quickly absorbs or permeates excretion fluid from the wearer, and moves toward the absorbent body 4. The topsheet 2 has a concavo-convex structure in which concave portions and convex portions extending in the longitudinal direction L are alternately arranged in the width direction W. Moreover, in this Embodiment, the surface sheet 2 is long in the direction in alignment with the longitudinal direction L, and is formed in the substantially rectangular shape.

  The material of the topsheet 2 is not particularly limited as long as it has liquid permeability and contains heat-fusible fibers. As a material of the surface sheet 2, a nonwoven fabric is mentioned, for example. The nonwoven fabric can be manufactured, for example, by forming a web (fleece) and bonding the fibers physically and chemically. Examples of the web forming method include a spunbond method, a dry method (a carding method, an airlaid method), a wet method, and the like. Examples of the bonding method between fibers include a thermal bond method (calendar method, air-through method, etc.), a chemical bond method, and a mechanical bond method (needle punch method, hydroentanglement method, stitch bond method, etc.). Examples of fibers constituting the nonwoven fabric include natural fibers (wool, cotton, etc.), recycled fibers (rayon, acetate, etc.), inorganic fibers (glass fibers, carbon fibers, etc.), synthetic resin fibers (polyethylene, polypropylene, polybutylene, ethylene). -Polyolefin such as vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; polyester such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid; And polyamides such as nylon). The fiber constituting the nonwoven fabric may be composed of a single component, or may be composed of a composite fiber such as a core / sheath fiber, a side-by-side fiber, or an island / sea fiber. A single-layer nonwoven fabric or a laminate in which single-layer nonwoven fabrics are laminated may be used.

The thickness, basis weight, fineness, fiber length, and the like of the surface sheet 2 are not particularly limited as long as they have liquid permeability, and known values can be used for absorbent articles. For example, the thickness of the surface sheet 2 is in the range of 0.1 to 5 mm, preferably in the range of 0.2 to 3 mm, basis weight is in the range of 5 to 100 g / ^{m 2,} preferably Is 10 to 50 g / m ² . The fineness is usually 0.5 to 10 dtex, preferably 1.0 to 5.0 dtex, and the fiber length is usually 20 to 100 mm, preferably 30 to 70 mm. In the present embodiment, the thickness, basis weight, fineness, fiber length, and the like of the surface sheet 2 are constant over the entire surface sheet 2. However, the thickness, basis weight, fineness, fiber length, etc. of the topsheet 2 may be partially different.

  In the present embodiment, the absorbent body 4 is bonded to the surface sheet 2 on the skin side surface of the surface core wrap sheet 401 with an adhesive, and the back surface sheet 3 on the non-skin side surface of the back surface core wrap sheet 402. Bonded with adhesive. The material for the adhesive is not particularly limited, and examples thereof include a hot melt adhesive. The hot melt adhesive can be appropriately selected from known hot melt adhesives such as synthetic rubber, polyolefin, ethylene-vinyl acetate, polyurethane, and acrylic.

  Next, the top sheet 2 of the absorbent article 1 will be further described. The topsheet 2 has a concavo-convex structure in which concave portions and convex portions extending in the longitudinal direction L are alternately arranged in the width direction W. In this Embodiment, the surface sheet 2 which has such an uneven structure is manufactured by embossing. FIG. 3 is an enlarged cross-sectional view showing a method for manufacturing such a top sheet 2.

  First, a raw nonwoven fabric 2P is prepared as a material for the topsheet 2. The non-woven fabric 2P is a non-woven fabric mentioned as the material for the top sheet 2 described above. The nonwoven fabric 2P is conveyed to an embossing apparatus. In the embossing device, an embossing roll in which wavy teeth are formed at a predetermined pitch along the width direction on the outer circumferential surface and an anvil roll are arranged facing each other, and between the embossing roll and the anvil roll. Nonwoven fabric 2P is sandwiched. As shown in FIG. 3A, the pressure Pe is applied to the nonwoven fabric 2P sandwiched between the embossing roll and the anvil roll at a predetermined pitch.

  As a result, as shown in FIG. 3B, the places where the pressure Pe is applied extend in the transport direction (MD direction) and are arranged at a predetermined interval in the width direction (CD direction) perpendicular to the transport direction. A plurality of concave portions, that is, a plurality of fused portions 21 are formed (embossing). On the other hand, between the adjacent fusion parts 21 of the plurality of fusion parts 21, a plurality of convex parts extending in the transport direction (MD direction) and relatively protruding from the fusion part 21 in the thickness direction T, that is, A plurality of protrusions 11 are formed at predetermined intervals in the width direction (CD direction). Here, since the non-woven fabric 2P is formed by being compressed and fused, the fused portion 21 has a very thin plate shape and has a structure that hardly expands or contracts. On the other hand, since the non-woven fabric 2P is formed without being compressed, the protruding portion 11 has an elliptical column shape having an elliptical cross section having a minor axis substantially the same as the thickness of the non-woven fabric 2P, and in the width direction (CD direction). The structure can be expanded and contracted and has flexibility in the thickness direction. The embossing roll may apply pressure Pe while heating the nonwoven fabric 2P.

  By using such an embossing method, the topsheet 2 having a concavo-convex structure can be formed easily and at low cost. That is, it can be said that the embossing method is one of the preferred forms as a method for forming the topsheet 2 having an uneven structure.

  The surface sheet 2 thus formed is then bonded to the absorbent body 4 via an adhesive. At this time, in the present embodiment, the surface sheet 2 is joined while being strongly pressed against the absorber 4, so that the surface of the surface sheet 2 on the side of the absorber 4 is not only the protruding portion 11 but also the fused portion 21. 4 sticks. As a result, as shown in FIG. 3C, the portion 15 of the protrusion 11 on the absorber 4 side is crushed and the degree of protrusion is reduced, and the portion 13 of the protrusion 11 opposite to the absorber 4 is crushed. Instead, the degree of protrusion increases. At this time, the tensile strength of the surface sheet is also improved.

  FIG. 4 is a plan view showing a state in which the top sheet 2 and the absorber 4 are overlapped. As shown in FIG. 4, in the present embodiment, the topsheet 2 has the longitudinal direction as the direction in which the fused portion 21 and the protrusion 11 of the topsheet 2 extend, that is, the transport direction during manufacture. And the surface sheet 2 and the absorber 4 are joined so that the longitudinal direction of the surface sheet 2 and the longitudinal direction of the absorber 4 may become mutually parallel.

  Moreover, in this Embodiment, although the protrusion part 11 is extended beyond both the edges in the longitudinal direction L of the absorber 4, this invention is not limited to such a form, The protrusion part 11 May extend to at least one end edge in the longitudinal direction L of the absorbent body 4 or beyond one end edge. If the protrusion part 11 is extended in this way, the air permeability of the surface sheet 2 can be further improved.

  5-6 is a figure which shows the structure of the surface sheet 2, FIG. 5 is a perspective view of the surface sheet 2, and FIG. 6 is an expanded sectional view in the frame Q1 of FIG. As shown in FIGS. 5 and 6, the top sheet 2 includes a first surface 2 a located on the side opposite to the absorber 4, and a second side located on the side opposite to the first surface 2 a, that is, on the absorber 4 side. Surface 2b. The plurality of fused portions 21 of the top sheet 2 extend in the longitudinal direction L and are arranged in parallel with each other at a predetermined interval in the width direction W. On the other hand, the plurality of protrusions 11 extend in the longitudinal direction L between adjacent fusion parts 21 among the plurality of fusion parts 21, and the first surface 2 a side of the fusion part 21 in the thickness direction T and the first. It protrudes to the 2nd surface 2b side, ie, the skin side and the non-skin side.

  The top sheet 2 and the top core wrap sheet 401 of the absorbent body 4 are intimately bonded via an adhesive 9. The adhesive 9 is arranged in a predetermined pattern which will be described later. Therefore, even in a portion without the adhesive 9, there is almost no gap between the top sheet 2 and the top core wrap sheet 401. In addition, since the adhesive 9 is present below the protrusion 11, it is possible to make the protrusion 11 less likely to expand and contract in the width direction W than the adhesive 9. Thereby, the expansion | extension to the width direction W of the surface sheet 2 can be suppressed. In addition, it is possible to suppress a situation in which the surface sheet 2 extends in the width direction W and the protruding portion 11 is stretched in the width direction W and is crushed to collapse the uneven structure, so that the characteristics associated with the uneven structure cannot be exhibited.

  Moreover, in this Embodiment, as shown in FIG. 6, in thickness direction T, the top part 12 of the protrusion part 11 by the side of the 1st surface 2a, and the bottom part 22 of the melt | fusion part 21 by the side of the 1st surface 2a The difference, that is, the height of the top portion 12 with respect to the bottom portion 22 is Tu, and the difference between the top portion 14 of the protruding portion 11 on the second surface 2b side and the bottom portion 24 of the fusion portion 21 on the second surface 2b side, that is, The height of the top 14 with respect to the bottom 24 is defined as Td. In this case, in the present embodiment, as described above, Tu> Td. In other words, the protrusion 11 on the second surface 2b side has a shape that is more crushed than the protrusion 11 on the first surface 2a side. That is, the unevenness of the surface sheet 2 on the second surface 2b side (surface core wrap sheet 401 side) is reduced. Therefore, the adhesive 9 can be easily disposed also in the fusion part 21 which is a concave portion on the second surface 2b side of the top sheet 2, and the adhesive 9 is more reliably bound to the top sheet 2 on the top core wrap sheet 401 side. it can. Thereby, the expansion | extension to the width direction W of the surface sheet 2 can be suppressed, and the situation where an uneven structure collapse | crumbles can be suppressed.

  Moreover, in this Embodiment, the part 15 by the side of the absorber 4 (surface core wrap sheet 401) of the protrusion part 11 is crushed, ie, the extent of protrusion is low and a fiber density becomes high. On the other hand, the portion 13 on the opposite side to the absorbent body 4 (surface core wrap sheet 401) side of the protrusion 11 is not crushed, that is, the degree of protrusion is high and the fiber density is low. Therefore, in the portion 15 on the surface core wrap sheet 401 side, the adhesive 9 can penetrate very well into the high fiber density portion 15 due to the high fiber density. Thereby, the adhesive 9 can be very well bound to the high fiber density portion 15, and the protrusion 11 can be made difficult to expand and contract in the width direction W. Thereby, the expansion | extension to the width direction W of the surface sheet 2 can be suppressed, and the situation where an uneven structure collapse | crumbles can be suppressed.

  Moreover, in this Embodiment, the surface sheet 2 is formed using the nonwoven fabric (example: air through nonwoven fabric, point bond nonwoven fabric, spun pond nonwoven fabric, or SMS nonwoven fabric) which couple | bonded fibers with heat. In these nonwoven fabrics, at least a part of the intersections of the fibers are fused to each other in order to bond the fibers constituting the nonwoven fabric by heat. Therefore, it is possible to make the surface sheet 2 difficult to extend as compared to the surface sheet 2 using a non-fused nonwoven fabric at the intersection of the fibers constituting the nonwoven fabric. In particular, in the protruding portion 11, in the portion 15 on the surface core wrap sheet 401 side where the fiber density is high, the density of the intersection where the fibers are fused also increases. Thereby, the expansion | extension of the width direction W of the protrusion part 11 can be suppressed more.

  In the surface sheet 2, in the width direction W, the width Wn of the protrusion 11 is preferably 1 to 5 mm, more preferably 1.5 to 4 mm, and still more preferably 2 to 3 mm. If the width Wn of the protruding portion 11 is less than 1 mm, the uneven structure of the topsheet 2 is too fine, and the contact area between the protruding portion 11 and the skin of the wearer cannot be reduced so much. The touch may be reduced. On the other hand, when the width Wn of the protruding portion 11 exceeds 5 mm, the structural difference from the nonwoven fabric before the uneven shaping process decreases, and thus the characteristics of the absorbent article 1 including the topsheet 2 having the uneven structure are exhibited. It becomes difficult to do.

  Furthermore, in the surface sheet 2, in the width direction W, it is preferable that the space | interval between the adjacent protrusion parts 11, ie, the width Wm of the melt | fusion part 21, is 0.3-2 mm, More preferably, 0.5-1. It is 5 mm, More preferably, it is 0.7-1 mm. When the distance between the adjacent protrusions 11 is less than 0.3 mm, the uneven structure of the topsheet 2 is too fine, and the contact area between the protrusions 11 and the skin of the wearer cannot be reduced so much. There is a possibility that the touch of the top sheet 2 is lowered. On the other hand, when the distance between the adjacent protrusions 11 exceeds 5 mm, the structural difference from the non-woven fabric before the uneven shaping process is reduced. Therefore, the absorbent article provided with the topsheet 2 having the uneven structure It becomes difficult to express the characteristic of 1.

  Therefore, in the topsheet 2, in the width direction W, the size of one pitch PI, which is the sum of the width Wm of one fused portion 21 and the width Wn of one protruding portion 11, is 1.3 to 7 mm. It is preferable that the thickness is 2 to 5.5 mm, and more preferably 2.7 to 4 mm.

  In the top sheet 2, the width Wn of the protruding portion 11 is preferably larger than the width Wm of the fused portion 21 in the width direction W. Since the width Wn of the protruding portion 11 is large, the height Tu in the thickness direction T of the protruding portion 11 can be further increased, whereby the absorptivity provided with the topsheet 2 in which concave portions and convex portions are alternately arranged. The characteristics of the article 1 can be exhibited more.

  Furthermore, in the surface sheet 2, in the thickness direction T, the height Tu on the first surface side of the protruding portion 11 is preferably 0.2 to 5 mm, more preferably 0.4 to 4 mm, and still more preferably. Is 0.6 to 3 mm. If the height of the protrusion 11 is less than 0.25 mm, the protrusion of the protrusion 11 is too small, and the structural difference from the nonwoven fabric before the uneven shaping process is reduced. It becomes difficult to express the characteristics of the absorbent article 1 with 2. On the other hand, when the height of the protrusion 11 exceeds 5 mm, the protrusion of the protrusion 11 is too large and has a sharp structure, so that it is difficult to obtain a soft touch.

  Furthermore, in the surface sheet 2, in the thickness direction T, the thickness Tm of the fused part 21 is preferably 0.05 to 2 mm, more preferably 0.1 to 1.5 mm, and more preferably 0.00. 2 to 1 mm. If the thickness of the fused part 21 is less than 0.05 mm, the fiber density of the fused part 21 becomes very high, the fused part 21 becomes too hard, and the wearer may feel uncomfortable. On the other hand, when the thickness of the fused part 21 exceeds 2 mm, the depression of the fused part 21 is too small, and the structural difference from the nonwoven fabric before the irregular shape forming process is reduced. It becomes difficult to express the characteristic of the absorbent article 1 provided with.

  In such an absorbent article 1 according to the present embodiment, the topsheet 2 has a concavo-convex structure, that is, the fusion part 21 and the protrusion part 11 that extend continuously in the longitudinal direction L. The characteristic (action effect) of the absorptive article 1 provided with the surface sheet 2 which has an uneven structure can be produced. That is, the excrement hardly adheres to the skin when the excrement enters the recess (fused part 21). Absorption of excrement is promoted by increasing the surface area of the topsheet 2 due to the concavo-convex structure (the fused portion 21 and the protruding portion 11). When the excrement in the recess (fused part 21) diffuses along the longitudinal direction L, the entire absorbent body 4 can be used for the excretion absorption without waste. The air permeability is improved along the longitudinal direction L by the concave portion (fused portion 21). A contact area with a wearer's skin falls by a recessed part (fusion part 21). A soft touch utilizing the concavo-convex structure is obtained by the flexibility of the convex portion (protruding portion 11). In particular, in the absorbent article 1 of the present embodiment, the fused portion 21 and the protruding portion 11 are linearly extended, i.e., have a grooved structure extending in the longitudinal direction L. It can play very remarkably.

Next, the predetermined pattern 30 which is a coating pattern of the adhesive 9 will be described.
FIG. 7 is a schematic diagram for explaining an example of the relationship between the topsheet 2 and the predetermined pattern of the adhesive 9 in the frame Q2 of FIG. However, FIG. 7A is a schematic diagram showing the relationship between the protruding portion 11 and the fused portion 21 of the topsheet 2 and the predetermined pattern 30 when the adhesive 9 is applied. FIG. 7B is an enlarged view showing the predetermined pattern 30 of the adhesive 9.

  The adhesive 9 has a thin line shape. The wire diameter of the adhesive 9 is preferably 10 to 500 μm, more preferably 50 to 300 μm. If the wire diameter of the adhesive 9 is smaller than 10 μm, the adhesive 9 is interrupted during coating, and it becomes difficult to form the predetermined pattern 30. On the other hand, if the wire diameter of the adhesive 9 is larger than 500 μm, the adhesive 9 is too thick and obstructs the absorption of excrement, and the absorption performance may be lowered. As a material of the adhesive 9, for example, a hot melt adhesive can be used.

  The thin line-shaped adhesive 9 forms a predetermined pattern 30. In the example shown in FIG. 7, an omega pattern is used as the predetermined pattern 30. By forming the predetermined pattern row 31 using the omega pattern, the fine-line adhesive 9 can be evenly disposed between the top sheet 2 and the top core wrap sheet 401.

  As shown in FIG. 7B, the predetermined pattern 30 has at least a horizontal portion 32a and a vertical portion 33a. The lateral portion 32a is a lateral portion 32a that extends along the width direction W and connects at least one fusion part 21 and the protrusion 11 adjacent to the at least one fusion part 21, and has a predetermined pattern. The angle formed by the tangent at an arbitrary point of the fine line of the adhesive 9 forming 30 with respect to the virtual line parallel to the width direction W is within α = 45 °. The longitudinal portion 33a is a longitudinal portion 33a that extends along the longitudinal direction L and has one end connected to one end of the lateral portion 32a, and at any point on the thin line of the adhesive 9 that forms the predetermined pattern 30. The angle formed by the tangent to the virtual line parallel to the width direction W is greater than α = 45 °. However, the angle formed with respect to the virtual line is the smallest of the possible angles. In the example of FIG. 7B, one end of the horizontal portion 32a is E2, the other end is E1, one end of the vertical portion 33a is E2, and the other end is E3.

  In the example illustrated in FIG. 7, the predetermined pattern 30 further includes a horizontal portion 32 b and a vertical portion 33 b. The lateral portion 32b extends in the width direction W, and is a lateral portion 32b that connects at least one fusion part 21 and the protrusion 11 adjacent to the at least one fusion part 21, and has a predetermined pattern. The angle formed by the tangent at an arbitrary point of the fine line of the adhesive 9 forming 30 with respect to the virtual line parallel to the width direction W is within α = 45 °. The vertical portion 33b is a vertical portion 33b extending along the longitudinal direction L and having one end connected to one end of the horizontal portion 32b, and at any point of the fine line of the adhesive 9 forming the predetermined pattern 30. The angle formed by the tangent to the virtual line parallel to the width direction W is greater than α = 45 °. However, the angle formed with respect to the virtual line is the smallest of the possible angles. In the example of FIG. 7B, one end of the lateral portion 32b is E4 and the other end is E3. At this time, the horizontal portion 32b has the other end E3 connected to the other end E3 of the vertical portion 33a. One end of the vertical portion 33b is E4, the other end is another E1, and the vertical portion 33b is connected to the other end of the horizontal portion 32a of the next predetermined pattern 30 at the other end E1.

  As shown in FIG. 7A, a plurality of the predetermined patterns 30 in FIG. 7B are arranged along the longitudinal direction L, and a predetermined pattern row 31 extending continuously along the longitudinal direction L is formed. doing. As further shown in FIG. 7A, the predetermined pattern rows 31 are arranged in parallel with each other in a plurality of rows in the width direction W.

  Here, the protrusion 11 that overlaps the predetermined pattern row 31, that is, the region 40 in one protrusion 11 delimited by the lateral portion 32 adjacent in the longitudinal direction L is considered. However, as long as the horizontal portion 32 is adjacent to the longitudinal direction L, the horizontal portion 32a and the horizontal portion 32b in the same predetermined pattern 30 may be used, or the horizontal portions 32a of the different predetermined patterns 30 may be used. And the lateral portion 32b. That is, for each predetermined pattern row 31, one protruding portion 11 is partitioned by a plurality of lateral portions 32 (not limited to the lateral portion 32 in the same predetermined pattern 30) arranged in the longitudinal direction L. A plurality of regions 40 aligned in the longitudinal direction L are defined in the one protrusion 11.

  At this time, in each of the plurality of regions 40, the minimum distance LMIN among the distances in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is the distance between the protruding portion 11 and the fusion portion 21. The distance (width) in the width direction W for one set is less than (= Wm + Wn). Preferably, the maximum distance LMAX among the distances in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is a distance (width) in the width direction W of one set of the protruding portion 11 and the fusion portion 21. (= Wm + Wn).

  In the present invention, the minimum distance LMIN in the longitudinal direction between the lateral portions 32 of the adhesive 9 adjacent to each other in the longitudinal direction L is thus the width in the width direction W of one set of the protruding portion 11 and the fusion portion 21 ( It is narrower than (distance). Therefore, for the reason described later, the topsheet 2 does not extend excessively even in an intermediate region between the lateral portions 32, and the extension of the protruding portion 11 can be sufficiently suppressed. That is, the expansion of the topsheet 2 can be sufficiently suppressed, so that even if the topsheet 2 is pulled in the width direction W, the topsheet 2 does not extend so much in the width direction W. Since the surface core wrap sheet 401 is hardly stretched, the surface core wrap sheet 401 can be prevented from breaking.

  In addition, due to the predetermined pattern 30 and the predetermined pattern row 31 of the adhesive 9 described above, the elasticity of the topsheet 2 is sacrificed to some extent. Can be suppressed. Thereby, even when a tensile load is applied in the width direction W, the degree of elongation is suppressed, and the characteristics of the absorbent article 1 including the topsheet 2 having an uneven structure can be maintained.

  Furthermore, the largest distance LMAX among the distances in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is the distance (width) in the width direction W of one set of the protruding portion 11 and the fused portion 21 ( = Wm + Wn) is preferable. That is, in each of the plurality of regions 40, the maximum distance LMAX among the distances in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is a set of the protruding portion 11 and the fusion portion 21. It is preferable that the distance in the width direction W is less than (width) (= Wm + Wn).

  In this way, when the maximum distance LMAX in the longitudinal direction between the lateral portions 32 of the adhesive 9 adjacent in the longitudinal direction L is narrower than the width in the width direction W for one set of the protruding portion 11 and the fusion portion 21, The extension of the intermediate region between the lateral portions 32 and the extension of the protruding portion 11 can be more reliably suppressed. Thereby, even if the surface sheet 2 is pulled in the width direction W, the surface sheet 2 does not extend so much in the width direction W, that is, the surface core wrap sheet 401 hardly expands. Can be suppressed.

  Further, when the surface core wrap sheet 401 is partially broken in the intermediate region between the lateral portions 32 in the longitudinal direction L, the breakage reaches the lateral portions 32 on both sides if the distance between the lateral portions 32 is large. It becomes too large until it becomes difficult to stop the elongation of breakage with the thin-line adhesive 9. However, in this case, since the interval between the lateral portions 32 is narrow, the fracture does not become too large until the lateral portions 32 on both sides are reached, and even the fine-line adhesive 9 stops the elongation of the fracture. be able to. As a result, even if a rupture occurs in a part of the surface core wrap sheet 401, the rupture can be suppressed to an extremely narrow range, so that the rupture of the entire surface core wrap sheet 401 can be suppressed.

  Here, the size of the predetermined pattern 30 (FIG. 7B) in the width direction W (the distance from one end to the other end in the width direction W) is equal to one fusion part 21 and one fusion point. If it has the magnitude | size which can connect the protrusion part 11 adjacent to the wearing part 21, there will be no restriction | limiting in particular. Preferably, the size of the predetermined pattern 30 in the width direction W is equal to or greater than the sum of the width Wm in the width direction W of one fused portion 21 and the width Wn in the width direction W of one protrusion 11. It is preferable. This is because it is possible to more reliably form the lateral portion 32 that can connect one fused portion 21 and the protruding portion 11 adjacent to the one fused portion 21.

  Further, the size of the predetermined pattern 30 (FIG. 7B) in the longitudinal direction L (the distance from one end of the longitudinal direction L to the other end) is the horizontal width adjacent to the longitudinal direction L in the predetermined pattern row 31. There is no particular limitation as long as the minimum distance in the longitudinal direction L between the direction portions 32 is less than the width in the width direction W of one set of the protruding portion 11 and the fusion portion 21. Preferably, the size of the predetermined pattern 30 in the longitudinal direction L is such that the maximum distance in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L corresponds to a set of the protruding portion 11 and the fusion portion 21. It is less than the width in the width direction W.

  Next, the minimum distance in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is set to be less than the width (Wm + Wn) in the width direction W of one set of the protruding portion 11 and the fusion portion 21. The reason will be described below.

  FIG. 8 is a schematic view for explaining a mechanism that causes the absorbent article to break. In order to simplify the description, a virtual region 40 on the top sheet 2 is considered as shown in the left diagram of FIG. The region 40 is formed by the fusion part 21 (width Wmb0) disposed on both sides of the protrusion part 11 in the width direction W and the two adhesives 9 crossing the protrusion part 11 in the width direction W. It is defined within (width Wnb0). However, it is assumed that the two adhesives 9 are separated in the longitudinal direction L by the interval Lp0. In this case, the two adhesives 9 can be viewed as a lateral portion of the predetermined pattern 30. That is, the region 40 is a region surrounded by the fused portions 21 on the both sides of the protruding portion 11 and the two adhesives 9. In this region 40, when the absorbent article 1 is pulled with the tensile load G in the width direction W, the adhesive 9 does not stretch tightly. Therefore, as shown in the right view of FIG. A region where the adhesive 9 is present and a region in the vicinity thereof (a lateral portion and a region in the vicinity thereof) hardly extend in the width direction W. On the other hand, the fused portion 21 has almost no elasticity, but can be bent a little. Therefore, the width of the region away from the adhesive 9 in the fused portion 21 is almost unchanged (Wma0≈ Wmb0) and slightly curved in the width direction W. As a result, the region of the protruding portion 11 away from the adhesive 9 (the region 41 between the lateral portions in the longitudinal direction L) extends to some extent in the width direction W. That is, the width of the protrusion 11 is slightly increased (Wnb0 → Wna0). At this time, if the distance Lp0 in the longitudinal direction L of the two adhesives 9 is sufficiently small, the fused portion 21 cannot be bent so much by the influence of the two adhesives 9, that is, the protruding portion 11 is in the width direction W. It is hardly stretched. That is, the width of the protrusion 11 is not so large. Thereby, in the surface core wrap sheet 401 joined to the surface sheet 2, no breakage occurs at a position corresponding to the intermediate region 41 between the lateral portions of the surface sheet 2.

  However, when the region 40 is as shown in the left diagram of FIG. 8B, the situation is different from the region 40 of FIG. In FIG. 8B, the region 40 includes a fusion part 21 (width Wmb1 = width Wmb0) arranged on both sides in the width direction W of the protrusion 11 and two crossing the protrusion 11 in the width direction W. The adhesive 9 is determined within the protrusion 11 (width Wnb1 = width Wnb0). However, the two adhesives 9 are spaced apart in the longitudinal direction L by a distance Lp1 (> Lp0). That is, compared with the area | region 40 of Fig.8 (a), the space | interval of the two adhesives 9, ie, the horizontal direction parts adjacent in the longitudinal direction L, is large. In this case, when the absorbent article 1 is pulled with the tensile load G in the width direction W, as shown in the right figure of FIG. The region where 9 exists and the region in the vicinity thereof hardly extend in the width direction W. However, the region of the fusion bonded portion 21 away from the adhesive 9 is largely changed in the width direction W as compared with the case of FIG. 8A without changing the width (Wma1≈Wmb1). As a result, the region (region 41) of the protruding portion 11 away from the adhesive 9 greatly extends in the width direction W. That is, the width of the protrusion 11 becomes very large (Wnb1 → Wna1> Wna0). Thus, if the distance Lp1 in the longitudinal direction L of the two adhesives 9 is too large, the influence of the two adhesives 9 does not reach the region away from the adhesive 9, and the fusion bonded portion 21 is greatly curved. That is, the protrusion 11 is greatly extended in the width direction W. Thereby, in the surface core wrap sheet 401 joined to the surface sheet 2, a break 42 occurs at a position corresponding to an intermediate region 41 between the lateral portions of the surface sheet 2.

  As described above, if the distance Lp in the longitudinal direction L of the two adhesives 9 is sufficiently small, the protrusion 11 is hardly extended in the width direction W as shown in FIG. 8A, and the distance Lp is sufficiently large. In this case, the protrusion 11 is greatly extended in the width direction W as shown in FIG. In other words, there is a threshold value for the interval Lp, and it can be said that the protrusion 11 is not stretched in the width direction W if the interval Lp is less than the threshold value. As such a threshold value, that is, a maximum value of the allowable interval Lp, a value that makes the region 40 a square can be considered. The reason is as follows. FIG. 9 is a schematic diagram showing the relationship of forces in the region 40. As shown in FIG. 9, when a tensile load G in the width direction W is applied to the fusion part 21 (side) of the region 40 (square), stress as shown by the black arrow is generated in the region 40, Stress is generated in the adhesive 9 (side) by the stress of the black arrow. At this time, if the region 40 is a square, the stress of the fusion part 21 (sides) on both sides in the width direction W in FIG. 9 is distributed in a balanced manner to the adhesive 9 (sides) on both sides in the longitudinal direction L. It is considered that the adhesive 9 (side) can support up to a load in the vicinity of the center in the longitudinal direction L of the fused portion 21 (side). However, if the distance between the adhesives 9 is larger than that in this case, that is, if the region 40 is a rectangle that is long in the longitudinal direction L, it becomes difficult to support the load near the center in the longitudinal direction L of the fused portion 21 with the adhesive 9. The vicinity of the center in the longitudinal direction L of the fused portion 21 is curved in the width direction W, and the state as shown in FIG. For the above reason, it is conceivable that the threshold value (the maximum value of the interval Lp) is a value that makes the region 40 square, that is, the width Wn of the protruding portion 11.

  However, when the width Wm of the fused part 21 is large, the fused part 21 is difficult to bend. Therefore, even if the distance Lp in the longitudinal direction L of the two adhesives 9 is made larger than in the case of a square shape, the fracture occurs. This problem is not expected to occur. Therefore, the threshold value (maximum value of the interval Lp) in consideration of the width Wm of the fused portion 21 was examined as follows.

  FIG. 10 is a schematic diagram showing the relationship between the distance between the adhesives 9 in the longitudinal direction L in the region 40 and the width Wm of the fused portion 21. 10A, the area 40 is square in FIG. 8A, and the width Wm of the fused portion 21 is set to a small value (example: about the thickness of the adhesive 9) Wmb3. In this case, as described above, since the distance Lp3 in the longitudinal direction L of the two adhesives 9 is set to the width Wnb3 of the protruding portion 11, the region 40 can be regarded as a substantially square. That is, the protrusion 11 is not greatly extended in the width direction W.

  Here, as shown in FIG. 10B, when the width Wm of the fused part 21 is set to a larger value Wmb4 (> Wmb3), the fused part 21 has a width with respect to the tensile load G in the width direction W. It becomes difficult to bend in the direction W. That is, the protrusion 11 is difficult to be extended in the width direction W. Therefore, even if the distance Lp4 in the longitudinal direction L of the two adhesives 9 is set to a value that makes the region 40 square, that is, to some extent larger than Wnb4 (= Wnb3), the protrusion 11 is greatly extended in the width direction W. It can be said that there is nothing. In this case, when considering the width Wmb4 >> width Wmb3, the width Wm of the fused portion 21 is increased by Wmb4 as compared with the case of FIG. 10A, and the extent to which the fused portion 21 is curved correspondingly. Suppressed. Therefore, the distance Lp4 between the two adhesives 9 in the longitudinal direction L can be made somewhat larger (ΔL1) than the value that makes the region 40 square.

  Similarly, as shown in FIG. 10 (c), when the width Wm of the fused part 21 is set to a larger value Wmb5 (> Wmb3), the fused part 21 has a width corresponding to the tensile load G in the width direction W. It becomes more difficult to bend in the direction W. That is, the protrusion 11 is not easily extended in the width direction W. Therefore, even if the distance Lp5 in the longitudinal direction L of the two adhesives 9 is set to a value that makes the region 40 square, that is, to some extent larger than Wnb5 (= Wnb3), the protrusion 11 is greatly extended in the width direction W. It can be said that there is nothing. In this case, considering the width Wmb5 >> width Wmb3, the width Wm of the fused portion 21 is increased by Wmb5 compared to the case of FIG. 10A, and the extent to which the fused portion 21 is curved correspondingly. Suppressed. Accordingly, the distance Lp5 between the two adhesives 9 in the longitudinal direction L can be made somewhat larger (ΔL2) than the value that makes the region 40 square.

From the above consideration, the larger the width Wm of the fused part 21 is, the larger the maximum value (threshold) of the distance Lp in the longitudinal direction L of the two adhesives 9 is made to be larger than the width Wn of the protruding part 11. Can do. However, even if the width Wm of the fused portion 21 is increased, the effect given to the distance Lp in the longitudinal direction L of the two adhesives 9 may be at most approximately the distance corresponding to the width Wm of the fused portion 21. Conceivable. That is, it is considered that ΔL1 and ΔL2 are at most approximately the widths Wmb4 and Wmb5 of the fused portion 21 at the maximum. Therefore, the distance Lp (threshold value) in the longitudinal direction L of the two adhesives 9 is finally as follows.
Threshold: (maximum value of the distance Lp in the longitudinal direction L of the two adhesives 9)
= (Width Wn of protrusion 11) + ΔL,
= (Width Wn of protrusion 11) + (Width Wm of fusion part 21)
It is. In the example of FIG.
(A) Lp4 = Wnb4 + Wmb4
(B) Lp5 = Wnb5 + Wmb5
It becomes.

  Here, in the above consideration, the threshold value is derived based on a virtual shape region 40 as shown in FIG. When the threshold value derived in this way is applied to the predetermined pattern 30 and the predetermined pattern row 31 of the actual adhesive 9, for example, the omega pattern shown in FIG. 7, it can be considered as follows. The predetermined pattern row 31 has a configuration in which the predetermined patterns 30 are continuously arranged along the longitudinal direction L, that is, a configuration in which the predetermined patterns 30 are connected to each other and extended (however, it may be partially interrupted due to manufacturing yield or the like) ing. Accordingly, in the region 40, at least a part of the interval in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L (not limited to the lateral portion 32 in the same predetermined pattern 30) is the above-mentioned. If the threshold value is satisfied, it is considered effective in suppressing the extension of the protrusion 11. That is, it is understood that at least the minimum distance in the longitudinal direction L between the lateral portions 32 only needs to satisfy the above threshold. Therefore, in order to suppress the extension of the protruding portion 11, at least the minimum distance of the distance in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is set to be equal to one set of the protruding portion 11 and the fusion portion 21. What is necessary is just to be less than the width (Wm + Wn) in the width direction W. More preferably, the maximum distance in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L is less than the width (Wm + Wn) in the width direction W of one set of the protruding portion 11 and the fusion portion 21. To do.

  In this manner, by setting the threshold value and forming the predetermined pattern 30 and the predetermined pattern row 31 of the adhesive 9 so as to satisfy the threshold value, the extension of the protruding portion 11 can be sufficiently suppressed. That is, extension of the top sheet 2 can be sufficiently suppressed. Thereby, even if the surface sheet 2 is pulled in the width direction W, the surface sheet 2 does not extend so much in the width direction W, that is, the surface core wrap sheet 401 hardly expands. Can be suppressed.

  Further, the threshold value is not limited to the virtual region 40 as shown in FIG. 8A or the omega pattern as shown in FIG. The same applies to patterns such as wave patterns and spiral patterns. Further, for example, the adhesive 9 does not necessarily have to be bridged between the adjacent protruding portions 11.

  As described above, in the absorbent article according to the present embodiment, at least a pair of the protruding portion 11 and the fusion portion 21 has a minimum distance in the longitudinal direction L between the lateral portions 32 adjacent to each other in the longitudinal direction L. It can be seen that by narrowing to less than the width (Wm + Wn) in the width direction W of the minute, it is possible to achieve both the characteristics of the absorbent article provided with the topsheet having the concavo-convex structure and the suppression of the breakage of the top corewrap sheet. .

  Next, another embodiment will be described. In the following, differences from the above-described embodiment will be mainly described. FIG. 11 is a schematic diagram for explaining another example of the relationship between the topsheet 2 and the predetermined pattern 30 of the adhesive 9 in the frame Q2 of FIG. FIG. 11 schematically shows the relationship between the protruding portion 11 and the fused portion 21 of the topsheet 2 and the predetermined pattern 30 when the adhesive 9 is applied.

  In the example shown in FIG. 11, an omega pattern or a wave pattern is used as the predetermined pattern 30. By forming the predetermined pattern row 31 using the omega pattern or the wave pattern, the fine-line adhesive 9 can be evenly disposed between the top sheet 2 and the top core wrap sheet 401. Thereby, the expansion | extension in the width direction W of the surface sheet 2 can be suppressed uniformly, Thereby, the fracture | rupture of the surface core wrap sheet 401 can be suppressed more reliably.

  In the predetermined pattern row 31 shown in FIG. 11, in the width direction W, the vertical portion of each predetermined pattern 30 reaches at least the fused portions 21 on both sides, and the horizontal portion (and the vertical portion) is at least the protruding portion 11. Crossing from one side to the other. By arranging each predetermined pattern 30 and forming the predetermined pattern row 31 in this way, the protruding portion 11 can be reliably fixed by the fusion portions 21 on both sides in the width direction W, and the protruding portion 11 is extended. Can be suppressed more reliably.

  Further, in the example shown in FIG. 11, the predetermined pattern 30 has the adhesive 9 spanned between the fusion portions 21 on both sides of one protrusion 11. However, the present invention is not limited to this example, and the adhesive 9 is bridged between the fusion parts 21 on both sides of the plurality of protrusions 11 and the plurality of fusion parts 21 therebetween. May be passed. In that case, the extension of the protrusion 11 can be more stably suppressed.

  Next, another embodiment will be described. In the following, differences from the above-described embodiment will be mainly described. FIG. 12 is a schematic diagram for explaining another example of the relationship between the topsheet 2 and the predetermined pattern 30 of the adhesive 9 in the frame Q2 of FIG. FIG. 12A is a schematic diagram showing the relationship between the protruding portion 11 and the fused portion 21 of the topsheet 2 and the predetermined pattern 30 when the adhesive 9 is applied. FIG. 12B is an enlarged view showing a predetermined pattern 30 of the adhesive 9.

  In the example shown in FIG. 12, a spiral pattern is used as the predetermined pattern 30. It is. By forming the predetermined pattern row 31 using the spiral pattern, the fine-line adhesive 9 can be evenly disposed between the top sheet 2 and the top core wrap sheet 401. Thereby, the expansion | extension in the width direction W of the surface sheet 2 can be suppressed uniformly, Thereby, the fracture | rupture of the surface core wrap sheet 401 can be suppressed more reliably.

  Further, in the plurality of predetermined pattern rows 31 shown in FIG. 12, a plurality of closed regions surrounded by the adhesive 9 of one or a plurality of predetermined patterns 30 are formed. When such a surface sheet 2 is used, the region in which the protruding portion 11 extends can remain in a narrow region called a closed region with respect to the expansion in the width direction W. As a result, since the extension of the protrusion 11 is limited, the extension of the protrusion 11 in the width direction W can be more reliably suppressed. Moreover, the range where the force which fractures | ruptures the surface core wrap sheet | seat 401 by the expansion | extension of the protrusion part 11 can be confined in the closed area | region. That is, even if the protrusion 11 breaks, it can remain in the closed region. Thereby, the fracture | rupture of the surface core wrap sheet 401 can be suppressed more reliably.

  Further, the plurality of predetermined pattern rows 31 shown in FIG. 12 are arranged in parallel to each other in the width direction W so as to overlap each other. When such a surface sheet 2 is used, a plurality of predetermined pattern rows 31 overlap with each other. Therefore, the density of the adhesive 9 is increased in the protrusions 11, so that the protrusions 11 are more reliably extended in the width direction W. Can be suppressed. In addition, a plurality of closed regions can be formed by overlapping the predetermined pattern rows 31 with each other.

  Further, in the predetermined pattern row 31 shown in FIG. 12, the predetermined patterns 30 shown in FIG. 12B are arranged along the longitudinal direction L so as to overlap each other. When such a surface sheet 2 is used, the predetermined patterns 30 overlap each other, so that the density at which the adhesive 9 is present in the protruding portion 11 is increased, and a plurality of closed regions can be formed.

  FIG. 13 is a schematic diagram for explaining a comparative example of the relationship between the surface sheet of the absorbent article and the adhesive pattern. FIG. 13 schematically shows the relationship between the protrusion 111 and the fusion part 121 and the predetermined pattern 130 when the adhesive 109 is applied to the surface sheet 102 having the same uneven structure as the surface sheet 2. In this comparative example, in the protruding portion 111 that overlaps the predetermined pattern row 131, most of the plurality of regions 140 have a minimum distance LMINc among the distances in the longitudinal direction L between the lateral portions adjacent to each other in the longitudinal direction L. , The distance in the width direction W of one set of the protruding portion 111 and the fused portion 121, specifically, for example, about 1.6 times or more. In such a case, when the tensile load G is pulled in the width direction W, the extension amount of the protrusion 111 in the width direction W is too large, and the surface core wrap sheet bonded to the surface sheet 2 with the adhesive 9 is broken. It has been confirmed that

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 4 Absorber 9 Adhesive 11 Protrusion part 21 Fusion part 30 Predetermined pattern 31 Predetermined pattern row 32 Lateral part 401 Front surface core wrap sheet 402 Back surface core wrap sheet 403 Absorber core

Claims (11)

A top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, wherein the absorbent core includes an absorbent core and a core wrap sheet that wraps the absorbent core. Comprising an adhesive that joins the surface sheet and the surface of the core wrap sheet on the surface sheet side,
The surface sheet is
A longitudinal direction, a width direction orthogonal to the longitudinal direction, and a thickness direction orthogonal to the longitudinal direction and the width direction,
A plurality of fusion portions extending in the longitudinal direction and arranged in parallel with each other at a predetermined interval in the width direction;
A plurality of protrusions extending in the longitudinal direction between the adjacent fusion parts of the plurality of fusion parts and projecting to the skin side and the non-skin side of the fusion part in the thickness direction. ,
The adhesive has a shape of a fine line, forms a predetermined pattern,
The predetermined pattern is:
A lateral portion that extends along the width direction and connects at least one fusion part and a protrusion adjacent to the at least one fusion part, the thin line of adhesive forming the predetermined pattern A lateral portion in which an angle formed by a tangent line at an arbitrary point with respect to a virtual line parallel to the width direction is within 45 °;
A longitudinal portion extending along the longitudinal direction and having one end connected to one end of the lateral portion, and a tangent line at an arbitrary point of an adhesive fine line forming the predetermined pattern is parallel to the width direction. Each including at least one longitudinal portion whose angle to the imaginary line is greater than 45 °,
A plurality of the predetermined patterns are arranged along the longitudinal direction, forming a predetermined pattern row extending continuously along the longitudinal direction,
The predetermined pattern rows are arranged in parallel to each other in a plurality of rows and the width direction,
In the protruding portion overlapping the predetermined pattern row, the minimum distance among the longitudinal distances between the lateral portions adjacent in the longitudinal direction is the width corresponding to one set of the protruding portion and the fusion portion. Less than the distance in the direction,
Absorbent article. In the protruding portion overlapping the predetermined pattern row, the maximum distance in the longitudinal direction between the lateral portions adjacent to each other in the longitudinal direction is the width corresponding to one set of the protruding portion and the fusion portion. Less than the distance in the direction,
The absorbent article according to claim 1. The fiber density of the protruding portion on the core wrap sheet side is higher than the fiber density of the protruding portion on the side opposite to the core wrap sheet side,
The absorbent article according to claim 1 or 2. In the plurality of fibers constituting the surface sheet, the fibers are fused at least at some of the intersections of the fibers.
The absorbent article as described in any one of Claims 1 thru | or 3. The width in the width direction of the protruding portion is larger than the width in the width direction of the fused portion,
The absorbent article as described in any one of Claims 1 thru | or 4. The height in the thickness direction of the protruding portion on the core wrap sheet side is lower than the height in the thickness direction of the protruding portion on the side opposite to the core wrap sheet side,
The absorbent article as described in any one of Claims 1 thru | or 5. The density of the intersections at which the fibers in the protruding portion on the core wrap sheet side are fused is higher than the density of the intersections at which the fibers in the projection on the opposite side of the core wrap sheet are fused. Is too expensive,
The absorbent article according to claim 6. The adhesive forms a plurality of closed regions surrounded by the fine-line adhesive by one or a plurality of the predetermined patterns.
The absorbent article as described in any one of Claims 1 thru | or 7. The predetermined pattern rows are arranged in parallel to each other in the width direction so as to overlap each other,
The absorbent article as described in any one of Claims 1 thru | or 8. The predetermined patterns in the predetermined pattern row are arranged along the longitudinal direction so as to overlap each other,
The absorbent article as described in any one of Claims 1 thru | or 9. The predetermined pattern row has an omega pattern, a wave pattern, or a spiral pattern.
The absorbent article as described in any one of Claims 1 thru | or 10.

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