Pad

Abstract

[Problem] To provide a pad that keeps soft stool that travels along fold lines in the pad from passing through base parts of three-dimensional gathers and leaking to the outside from respective side parts of the pad. [Solution] According to the present invention, a liquid-permeable second sheet that has a greater width in the left-right direction than a top sheet is provided between the top sheet and an absorption body, base parts of three-dimensional gathers that extend in the front-rear direction are fixed to respective side parts in the left-right direction of the second sheet, the absorption body and the side parts in the left-right direction of the second sheet extend further in the left-right direction than the base parts, and first embossing regions are formed at respective side parts of the base parts at fold parts of the second sheet such that the length in the front-rear direction of the first embossing regions is longer than the length of the fold parts.

Description

pad

[0001] This invention relates to a pad to be attached to the inner surface of disposable diapers, such as tape-type or pant-type diapers.

[0002] The pad consists of a liquid-permeable top sheet, a second sheet designed to quickly transfer liquid that has permeated the top sheet to the absorbent layer, and an absorbent layer, all layered in that order. Furthermore, to prevent the movement of excrement in the width direction on the top sheet and to prevent lateral leakage, three-dimensional gathers are provided that rise from the inner surfaces on both sides of the product in the width direction.

[0003] Tape-type pads are folded into thirds towards the top sheet before being placed in the packaging film, while pant-type pads are folded in half. Consumers remove the pads from the packaging film, unfold them to a flat state, and then apply them to their body.

[0004] A technique is known in which, in order to prevent urine urinated on the pad or soft stool defecated on it from leaking out to the outside through the roughly concave fold lines formed on the top sheet and second sheet when folded, multiple embossed lines are provided on the fold lines at predetermined intervals in the width direction (Patent Documents 1 and 2).

[0005] Japanese Patent Publication No. 2018-166717 Japanese Patent Publication No. 2017-99458

[0006] However, the technologies described in Patent Documents 1 and 2 had been criticized for the problem that soft stools with low viscosity would travel along the fold lines of the pad, accumulate near the base of the gathers, and then leak out through the second sheet and the base of the gathers to the outside.

[0007] Therefore, the object of the present invention is to provide a pad that can prevent soft stool traveling along the fold lines of the pad from passing through the base of the three-dimensional gathers and leaking out to the outside (disposable diaper) from both sides of the pad.

[0008] The means for solving the above problems are as follows. The first means is a pad comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent between the top sheet and the back sheet, wherein a liquid-permeable second sheet with a width in the left-right direction greater than that of the top sheet is provided between the top sheet and the absorbent, the bases of three-dimensional gatherers extending in the front-rear direction are fixed to both sides of the second sheet in the left-right direction, the absorbent and both sides of the second sheet in the left-right direction extend further in the left-right direction than the base, a first embossed region is formed on both sides of the base at the folded portion when the second sheet is folded, and the length of the first embossed region in the front-rear direction is made longer than the length of the folded portion.

[0009] The second means is characterized in that, in the first means, a second embossed region is formed on both sides in the front-to-back direction of the first embossed region, and the distance between the second emboss of the second embossed region in at least one of the front-to-back direction and the left-to-right direction is made larger than the distance between the first emboss of the first embossed region in the front-to-back direction and the left-to-right direction.

[0010] The third means is characterized in that, in the second means, the longitudinal directions of the first emboss and the second emboss are arranged along the front-to-back direction, and in a side view, the front-to-back side portions of the first emboss and the front-to-back side portions of adjacent first emboss overlap.

[0011] The fourth means is characterized in that, in the second means, the first emboss and the second emboss are formed as rectangular rectangular embossings, the rectangular embossing positioned in front of the center line in the front-rear direction of the folded portion extends forward as it extends in the width direction, and the rectangular embossing positioned behind the center line in the front-rear direction of the folded portion extends backward as it extends in the width direction.

[0012] The fifth means is the means of any one of the first to fourth, wherein the fiber density of the second sheet is 0.01 to 0.08 g / cm³. ３ It is characterized by being such.

[0013] According to the first method, a liquid-permeable second sheet with a width greater in the left-right direction than the top sheet is provided between the top sheet and the absorbent, the bases of three-dimensional gathers extending in the front-rear direction are fixed to both sides of the second sheet in the left-right direction, the absorbent and both sides of the second sheet in the left-right direction extend further in the left-right direction than the base, a first embossed region is formed on both sides of the base at the fold when the second sheet is folded, and the length of the first embossed region in the front-rear direction is made longer than the length of the fold, so that soft stool traveling along the fold line provided in the fold of the pad passes through the base of the three-dimensional gathers and leaks out from both sides of the pad to the outside.

[0014] According to the second method, in addition to the effects of the first method, second embossed regions are formed on both sides of the first embossed region in the front-to-back direction, and the distance between the second emboss of the second embossed region in at least one direction (front-to-back and left-to-right) is made larger than the distance between the first emboss of the first emboss of the first embossed region in the front-to-back and left-to-right directions, thereby suppressing wrinkles that occur on the second sheet when the emboss is formed.

[0015] According to the third method, in addition to the effects of the second method, the longitudinal directions of the first emboss and the second emboss are arranged along the front-to-back direction, and in a side view, the front-to-back sides of the first emboss and the front-to-back sides of the adjacent first emboss overlap, so that soft stool traveling along the fold line can be further suppressed from passing through the base of the three-dimensional gathers and leaking out from both sides of the pad to the outside.

[0016] According to the fourth means, in addition to the effects of the second means, the first and second embossings are formed as rectangular embossings, and the rectangular embossings positioned in front of the center line in the front-to-back direction of the fold extend forward as they extend in the width direction, and the rectangular embossings positioned behind the center line in the front-to-back direction of the fold extend backward as they extend in the width direction, so that soft stool traveling along the fold line passes through the base of the three-dimensional gathers and leaks out from both sides of the pad to the outside.

[0017] According to the fifth method, in addition to the effects of any one of the first to fourth methods, the fiber density of the second sheet is 0.01 to 0.08 g / cm³. ３Therefore, it is possible to further suppress the leakage of soft stool that travels along the fold line through the base of the three-dimensional gathers and out to the outside from both sides of the pad.

[0018] This is an inner surface plan view of the pad. This is an outer surface plan view of the pad. This is a cross-sectional view taken along line A-A in Figure 1. This is a plan view of a partial cross-section of the pad of the first embodiment. This is an enlarged plan view of the emboss formed on the second sheet second embodiment. This is an explanatory diagram of the emboss in the first and second embodiments. This is an enlarged plan view of the emboss formed on the second sheet of the pad of the third embodiment. This is an explanatory diagram of the emboss in the third embodiment.

[0019] As shown in Figures 1 to 3, the pad 100 installed inside the pant-type disposable diaper is formed from, in order from the inner side facing the body, a liquid-permeable top sheet 11, a second sheet 20 with a faster liquid permeability than the top sheet 11, an absorbent core 12 that absorbs liquid, a liquid-impermeable back sheet 13, an outer sheet 14 made of nonwoven fabric or the like, and three-dimensional gathers 15 provided on both sides in the width direction of the absorbent core 12.

[0020] The absorbent body 12 has a constricted portion 12D formed approximately in the center of its longitudinal direction, corresponding to the wearer's crotch area. For convenience, in this specification, the portion of the absorbent body 12 that is longitudinally in front of the constricted portion 12D, corresponding to the wearer's front body, is referred to as the front body portion 12C, and the portion of the absorbent body 12 that is longitudinally in rear of the constricted portion 12D, corresponding to the wearer's back body, is referred to as the back body portion 12E.

[0021] A rectangular front locking member 18A, having a longer side in the width direction, is provided on the outer surface of the outer sheet 14 corresponding to the front end of the front body portion 12C of the absorbent body 12, and a rectangular rear locking member 18B, having a longer side in the width direction, is provided on the outer surface of the outer sheet 14 corresponding to the rear end of the rear body portion 12E of the absorbent body 12. The front locking member 18A and the rear locking member 18B are collectively referred to as the locking member 18.

[0022] <Pad of the First Embodiment> As shown in Figure 4, before storing the pad 100 in the packaging film (not shown), the pad 100 is folded in three along two predetermined fold lines 30 in the front-to-back direction toward the top sheet 11 and then stored in the packaging film. The positions of the fold lines 30 are predetermined by the size and shape of the pad 100, the folding device (not shown), etc. However, it is known that the fold lines 30 may be misaligned within a predetermined range in the front-to-back direction depending on the line speed of the folding device, etc. In this specification, for ease of understanding, the range in which the fold lines 30 are misaligned in the front-to-back direction is referred to as the fold portion 31, and will be described in detail below.

[0023] As shown in Figure 5, a first embossed region 41 is formed on both sides of the base of the three-dimensional gather 15 in the folded portion 31 of the second sheet 20, with multiple first embossings 40 extending outward in the width direction from the base. The length of this first embossed region 41 in the front-to-back direction is made longer than the length of the folded portion 31 in the front-to-back direction. As a result, soft stool flows along the folded portion 31 and accumulates near the base of the three-dimensional gather 15. The first embossed region 41 prevents some of the soft stool accumulated near the base from leaking out of the gathered sheet 16 through the second sheet 20, thereby reducing leakage from the gathered sheet 16. Note that the shaded area in Figure 5 indicates the base of the three-dimensional gather 15.

[0024] As shown in Figure 7, the first emboss 40 is represented as an ellipse where the length in the front-to-back direction 40y is longer than the length in the width direction 40x, but it may also be a circle where the length in the width direction 40x is equal to the length in the front-to-back direction 40y. However, an ellipse shape for the first emboss 40 allows soft stool to spread more in the front-to-back direction and be absorbed by the absorbent material 12. The size of the first emboss 40 can be determined as appropriate, but it is usually preferably 3 mm or more, and particularly preferably 4 to 7 mm.

[0025] The length of the first embossed area 41 in the front-to-back direction is preferably 25 mm or more, and particularly preferably 25 to 35 mm, since the width of the folded portion 31 in the front-to-back direction is often around 20 mm. It is also preferable to arrange the first embossing in about two rows in the width direction. The length in the width direction depends on the length of the outer width of the second sheet 20, but is preferably 6 mm or more, and particularly preferably 8 to 15 mm.

[0026] Embosses such as the first emboss 40 can be formed on the second sheet 20 by heat embossing or ultrasonic welding.

[0027] <Pad of the second embodiment> As shown in Figure 6, a second embossed area 43 is formed on both sides of the first embossed area 41 in the front-to-back direction, with multiple second embossing areas 42. The spacing between each embossing area in the front-to-back direction and width direction is larger in the second embossed area 43 than in the first embossed area 41. By adopting this configuration, the width of the embossed area in the front-to-back direction is widened, making it less likely for loose stool to leak out than if only the first embossed area 41 were provided. Furthermore, the difference in spacing between the embossed areas can also suppress wrinkle formation in the second sheet 20 due to embossing. Note that the shaded area in Figure 6 indicates the base of the three-dimensional gather 15.

[0028] As shown in Figure 7, the size of the second emboss 42 may be the same as the first emboss 40, but it is more preferable to make it a different size, as shown in the illustrated example, from the viewpoint of preventing wrinkles from forming on the second sheet 20. The size can be determined as appropriate, but it is usually 5 mm or larger, and 6 to 10 mm is particularly preferable.

[0029] If the length of the second embossed area 43 in the front-to-back direction is made too long, it may worsen the fit due to the embossed area, so it is preferably 15 mm or more, and particularly preferably 18 to 30 mm. The length in the width direction also depends on the length of the outer width of the second seat 20, but it is preferably 6 mm or more, and particularly preferably 8 to 15 mm. Therefore, the combined length of the front-to-back directions of the first embossed area 41 and the second embossed area 43 is preferably 55 mm or more, and particularly preferably 60 to 100 mm.

[0030] The distance between the centers of the LDs in the front-to-back direction of the second emboss 42L is greater than the distance between the centers of the LDs in the front-to-back direction of the first emboss 40L. The length of this 42L is preferably 1.5 to 3 times, and especially preferably 2 times or more, that of 40L.

[0031] The center spacing 40W of the width direction WD of the first emboss 40 and the center spacing 42W of the width direction WD of the second emboss 42 may be the same, but it is preferable to make the width of 42W larger than that of 40W from the viewpoint of preventing wrinkles from forming on the second seat 20. The length of 42W is preferably 1.1 to 1.5 times that of 40W.

[0032] In particular, the first embossed region 41 is more preferable if the longitudinal direction of the embossing is arranged along the front-to-back direction, and in a side view, the front-to-back sides of the first emboss 40 overlap with the front-to-back sides of adjacent first emboss 40, i.e., arranged in a grid pattern, because even if soft stool flows along the fold 31, it is easier to spread the soft stool to the surrounding area.

[0033] <Pad of the Third Embodiment> As shown in Figure 8, a first rectangular embossed region 45 is formed on both sides of the base of the three-dimensional gather 15 in the folded portion 31 of the second seat 20, with multiple first rectangular embossings 44 extending outward in the width direction from the base. Furthermore, a second rectangular embossed region 47 is formed on both sides of the first rectangular embossed region 45 in the front-rear direction, with multiple second rectangular embossings 46. The spacing between each embossing in the front-rear direction of the second rectangular embossed region 47 is larger than that of the first rectangular embossed region 45. Although not shown, the spacing in the width direction may be larger than that of the first rectangular embossed region 45. Note that the same reference numerals are used for the same components as in the pad of the first embodiment, and their descriptions are omitted.

[0034] By arranging the first rectangular emboss 44 and the second rectangular emboss 46, which have angles within a predetermined range with respect to the center line of the folded portion 31, as in this embodiment, soft stool can be diffused around the folded portion 31 and absorbed by the absorbent material 12. The angles of the first rectangular emboss 44 and the second rectangular emboss 46 with respect to the center line of the folded portion 31 are preferably set at 20 to 40 degrees, and more preferably at 25 to 35 degrees.

[0035] As shown in Figure 9, the first rectangular emboss 44 and the second rectangular emboss 46 are shown as the same size, but it is preferable to make them different sizes from the viewpoint of preventing wrinkles in the second sheet 20. The size can be determined as appropriate, but in the usual case, the length 46x in the width direction is preferably 10 mm or more, and particularly preferably 15 to 18 mm. Also, as with the first embodiment, if the length in the front-to-back direction is made too long, there is a risk that the fit will be worsened by the embossed area, so the length in the front-to-back direction of the second rectangular embossed area 47 is preferably 15 mm or more, and particularly preferably 18 to 30 mm. The length in the width direction also depends on the length of the width direction outer edge of the second sheet 20, but is preferably 6 mm or more, and particularly preferably 8 to 15 mm. Therefore, the combined length of the front-to-back lengths of the first rectangular embossed area 45 and the second rectangular embossed area 47 is preferably 55 mm or more, and particularly preferably 60 to 100 mm.

[0036] The distance between the centers of the LDs in the front-to-back direction of the second rectangular embossing 46 is greater than the distance between the centers of the LDs in the front-to-back direction of the first rectangular embossing 44 (44L). It is particularly preferable that the length of 46L be 1.5 to 3 times, and especially 2 times or more, that of 44L.

[0037] Next, the materials and characteristics of the top sheet 11 will be explained in order. (Top sheet) As the top sheet 11, perforated or non-perforated nonwoven fabric or porous plastic sheet is preferred. The material fibers constituting the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene (olefin-based), polyester, or polyamide, as well as regenerated fibers such as rayon or cupro, or natural fibers such as cotton. Nonwoven fabrics obtained by appropriate processing methods such as the spunlace method, spunbond method, thermal bond method, meltblown method, or needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drape, and the thermal bond method is excellent in terms of bulkiness and softness. When a large number of perforations are formed in the top sheet 11, urine and the like are absorbed quickly, resulting in excellent dry touch properties. Furthermore, the front and rear ends of the top sheet 11 in the longitudinal direction extend further in the front-to-back direction than the front and rear ends of the absorber 12 in the longitudinal direction and are fixed to the front and rear ends of the back sheet 13 in the longitudinal direction, and the left and right ends of the top sheet 11 in the width direction extend to the inside of the base of the three-dimensional gather 15.

[0038] Top sheet 11 has a fineness of approximately 2-15 dtex and a basis weight of 10-45 g / m. ２ A nonwoven fabric of a certain degree can be used. Furthermore, in order to prevent loose stool from remaining on the top sheet 11, it is preferable that at least the surface of the top sheet 11 is water-repellent or hydrophobic.

[0039] (Second sheet) In order to quickly transfer the liquid that has permeated through the top sheet 11 to the absorbent 12, a second sheet 20 is provided on the back side of the top sheet 11, which has a faster liquid permeation rate than the top sheet 11. This second sheet 20 is intended to quickly transfer the liquid to the absorbent 12, enhance the absorption performance of the absorbent 12, and prevent the phenomenon of "backflow" of the absorbed liquid from the absorbent 12.

[0040] Examples of the second sheet 20 include the same material as the top sheet 11, spunlace nonwoven fabrics, spunbond nonwoven fabrics, SMS nonwoven fabrics, pulp nonwoven fabrics, mixed sheets of pulp and rayon, point-bonded nonwoven fabrics, or crepe papers. Air-through nonwoven fabrics are particularly preferred because they are bulky. It is preferable to use core-sheath structured composite fibers for the air-through nonwoven fabric; in this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferred. The basis weight is 17 to 80 g / m ２ is preferred, and 25 to 60 g / m ２ is more preferred. It is preferable that the fineness of the raw material fibers of the nonwoven fabric is 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers with the core not at the center, hollow fibers, or eccentric and hollow fibers as all or part of the mixed raw material fibers. The fiber density is 0.01 to 0.08 g / cm ３ is preferred.

[0041] The left and right end portions in the width direction of the second sheet 20 extend beyond the base portion of the three-dimensional gathers 15 to the vicinity of the left and right end portions in the width direction of the absorbent body 12. Further, the length of the second sheet 20 in the front-rear direction may be the same as the full length of the diaper, or may be the same as the length of the absorbent body 12.

[0042] For the purpose of preventing positional displacement relative to the member on the back side, it is desirable that the second sheet 20 is fixed to the member adjacent to the back side by a joining means using material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the second sheet 20 is fixed to the surface of the portion located on the front side of the absorbent body 12 by the hot melt adhesive applied to the back surface thereof.

[0043] (Absorbent Body) As the absorbent body 12, one mainly composed of a porous structure (including inter-fiber gaps) in which absorbent materials are aggregated is suitable. As the absorbent material, hydrophilic fibers such as pulp fibers are suitably used, and a superabsorbent polymer (SAP) in particulate form or the like can be mixed as necessary to ensure the absorption amount. The basis weight of the pulp fibers is, for example, 100 to 450 g / m ２ It can be about this level.

[0044] Suitable superabsorbent polymers include carboxymethylcellulose, polyacrylic acid and its salts, acrylate polymer crosslinks, starch-acrylic acid graft copolymers, hydrolysates of starch-acrylonitrile graft copolymers, polyoxyethylene crosslinks, carboxymethylcellulose crosslinks, polyethylene oxide, partially crosslinked water-expanding polymers such as polyacrylamide, or copolymers of isobutylene and maleic acid. Products to which an anti-blocking agent has been added to suppress blocking due to moisture absorption can also be used. Superabsorbent polymers can also exist in various forms such as powder, particulate, granular, pellet, sol, suspension, gel, film, and nonwoven fabric, all of which can be used in the present invention, with particulate polymers being particularly preferred. Suitable superabsorbent polymer particles have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, so-called backflow occurs, where the liquid supplied into the absorbent body 12 flows back out of the absorbent body 12. Furthermore, as the superabsorbent polymer particles, those with a gel strength of 1000 Pa or more are preferably used. This effectively suppresses stickiness after liquid absorption, even when a bulky absorbent material 12 is used. The basis weight of the superabsorbent polymer can be determined as appropriate, but as an example, when intended for absorbing loose stools in nursing care applications, 50 to 200 g / m² is used. ２ It can be done this way.

[0045] The ratio of fibers to superabsorbent polymer particles in the absorbent material 12 is not particularly limited; for example, the ratio of fibers to superabsorbent polymer particles by weight can be 40:60 to 65:35.

[0046] The thickness of the absorbent 12 is not particularly limited, but can be 1 to 30 mm, preferably 1.5 to 15 mm, and more preferably 5 to 13 mm. The thickness of the absorbent 12 may be uniform, or regions with relatively thicker or relatively thinner thickness may be formed.

[0047] The length of the constricted portion 12D in the longitudinal direction is formed to be 20-50% of the length of the absorbent body 12 in the longitudinal direction, and the narrowest width of the constricted portion 12D in the width direction is formed to be 70-80% of the width of the absorbent body 12 in the width direction. This allows the pad to adhere closely to the wearer and improves the fit performance. Figures 1 and 2 show an absorbent body 12 with a roughly hourglass shape in which the constricted portion 12D is formed approximately in the center in the longitudinal direction, but it is also possible to form it in a rectangular shape or the like without forming the constricted portion 12D. Also, Figures 1 and 2 show a form in which the length of the front body portion 12C is formed to be shorter than the length of the rear body portion 12E in the longitudinal direction, but the length of the front body portion 12C and the rear body portion 12E in the longitudinal direction can also be the same length.

[0048] (Backsheet) The sheet located on the back side of the absorbent 12 is called the backsheet 13. As the backsheet 13, an impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, a sheet that is permeable to moisture is preferred in order to prevent stuffiness. A water-impermeable and permeable sheet is a microporous sheet obtained by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction. Furthermore, the front and rear ends in the longitudinal direction of the backsheet 13 extend in the front and rear direction beyond the front and rear ends in the longitudinal direction of the absorbent 12 and are fixed to the front and rear ends in the longitudinal direction of the outer sheet 14, and the left and right ends in the width direction of the backsheet 13 extend in the left and right direction beyond the left and right ends in the width direction of the absorbent 12 and are fixed to the left and right ends in the width direction of the outer sheet 14.

[0049] (Outer sheet) The material of the outer sheet 14 is not particularly limited, but examples include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics with a plastic film on the surface of a nonwoven fabric, and laminated sheets made by layering and bonding a nonwoven fabric to a plastic film. It is preferable to use a material that is both impermeable to liquids and permeable to liquids for the outer sheet 14, which is preferred from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler into an olefin resin such as polyethylene and polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction is widely used. In addition, sheets that are made impermeable to liquids without using a plastic film can also be used as the outer sheet 14 by methods such as using a nonwoven fabric made of microdenier fibers, strengthening leak resistance by reducing the voids in the fibers by applying heat or pressure, or coating with a superabsorbent resin or hydrophobic resin or water repellent agent.

[0050] (Three-dimensional gather) The three-dimensional gather 15 is formed from a base fixed to the widthwise side of the second sheet 20 and a main body extending from the base beyond the widthwise side of the absorber 12, etc., to the inner surface side of the top sheet 11. The three-dimensional gather 15 is formed from a gather sheet 16 and an elongated gather elastic member 17 extending in the longitudinal direction.

[0051] (Gathered Sheet) The gathered sheet 16 can be made of SMS nonwoven fabric (SMS, SSMMS, etc.), olefin-based materials such as polyethylene or polypropylene, polyester-based materials, amide-based synthetic fibers, regenerated fibers such as rayon and cupro, or natural fibers such as cotton. Nonwoven fabrics obtained by appropriate processing methods such as spunbonding, thermal bonding, meltblown, or needle punching can be used, but it is especially preferable to use a nonwoven fabric with a low basis weight and excellent breathability to prevent stuffiness. Furthermore, for the gathered sheet 16, it is preferable to use a water-repellent treated nonwoven fabric coated with a silicone-based, paraffinic metal-based, alkylchromic cloid-based water-repellent agent, etc., in order to prevent the permeation of urine, etc., prevent rashes, and enhance the feel on the skin (dryness).

[0052] (Gathered Elastic Member) As the gathered elastic member 17, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, silicone, and polyester, which are commonly used, can be used. Furthermore, in order to make it difficult to see from the outside, it is preferable that the thickness be 925 dtex or less, the elongation rate be 150 to 350%, and the spacing be 10.0 mm or less. Gathered elastic members 17 can be provided one at a time, or multiple at a time. The gathered elastic member 17 causes the three-dimensional gathers 15 to stand up toward the inner surface by its elastic force, and can be used in the form of threads or in the form of tapes with a predetermined width. The elongation rate is calculated as length when stretched / length of natural length × 100 [%].

[0053] (Locking Member) The locking member 18 is preferably a hook material of a mechanical fastener. The hook material can be in any shape, such as (A) L-shape, (B) J-shape, (C) mushroom-shaped, (D) T-shape, or (E) double J-shape (a shape in which two J-shaped pieces are joined back to back). Alternatively, an adhesive layer can be used instead of the hook material.

[0054] (Joining means) Adjacent members in the thickness direction are joined at appropriate locations or over the entire surface. For example, the top sheet 11 and the second sheet 20, and the second sheet 20 and the absorber 12 are joined at a part of the opposing surface (a dotted pattern, etc.) or over the entire surface. Hot melt adhesive can be used as a joining means to join each member. Hot melt adhesive can be applied by known methods such as slot application, continuous linear or dotted bead application, spiral or Z-shaped spray application, or pattern coating (transfer of hot melt adhesive using a relief printing method). Alternatively or in conjunction with this, at the fixing portion of the elastic member, hot melt adhesive can be applied to the outer surface of the elastic member to fix the elastic member to the adjacent member. Examples of hot melt adhesives include EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester / polyamide-based adhesives, but they can be used without particular limitation. As a joining means to join each component, material welding means such as heat sealing or ultrasonic sealing can also be used.

[0055] (Nonwoven fabric) As the nonwoven fabric mentioned above, known nonwoven fabrics can be used as appropriate depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, including synthetic fibers such as polyethylene or polypropylene (olefin-based), polyester-based, and polyamide-based (including single-component fibers as well as composite fibers such as core-sheaths), as well as regenerated fibers such as rayon and cupro, and natural fibers such as cotton, and these can also be used in mixtures. To increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. Furthermore, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including hydrophilic fibers that have become hydrophilic with a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including water-repellent fibers that have become water-repellent with a water-repellent agent). Furthermore, nonwoven fabrics are generally classified according to the length of the fibers, the sheet formation method, the fiber bonding method, and the lamination structure into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punch nonwoven fabrics, point bond nonwoven fabrics, and laminated nonwoven fabrics (such as SMS nonwoven fabrics and SMMS nonwoven fabrics, which have a meltblown layer sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

[0056] The present invention can be used not only for the pad-type disposable diapers described above, but also for all types of absorbent articles, such as tape-type disposable diapers and pant-type disposable diapers.

[0057] <Explanation of Terms in the Specification> When the following terms are used in this specification, they have the following meanings unless otherwise specified in the specification.

[0058] "MD direction" and "CD direction" refer to the flow direction (MD direction) and the transverse direction (CD direction) perpendicular to it in the manufacturing equipment. One of these is the front-to-back direction of the product, and the other is the width direction of the product. The MD direction of a nonwoven fabric is the direction of the fiber orientation of the nonwoven fabric. Fiber orientation is the direction in which the fibers of the nonwoven fabric run. For example, it can be determined by a measurement method that conforms to the fiber orientation test method by zero-distance tensile strength of the TAPPI standard method T481, or by a simple measurement method that determines the fiber orientation direction from the ratio of tensile strength in the front-to-back and width directions.

[0059] - The term "front-rear direction" refers to the direction (longitudinal direction) indicated by reference sign LD in the drawings, and the term "width direction" refers to the direction (left-right direction) indicated by WD in the drawings, wherein the front-rear direction and the width direction are orthogonal to each other.

[0060] - The term "front side" refers to the side closer to the wearer's skin when worn, and the term "back side" refers to the side farther from the wearer's skin when worn.

[0061] - The term "front surface" refers to the surface of a member that is closer to the wearer's skin when worn, and the term "back surface" refers to the surface of the member that is farther from the wearer's skin when worn.

[0062] The term "expanded state" refers to a state where the article is flatly expanded without contraction or slack.

[0063] The "elongation rate" means a value obtained when the natural length is defined as 100%. For example, an elongation rate of 200% is synonymous with an elongation magnification of 2 times.

[0064] "Mass per unit area" is measured as follows. After pre-drying a sample or a test piece, the sample or test piece is left to stand in a test room or apparatus under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until a constant weight is achieved. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment with a temperature of 100°C. Pre-drying is not required for fibers with an official moisture regain of 0.0%. A sample with dimensions of 100 mm × 100 mm is cut out from the test piece that has reached a constant weight using a sample-cutting template (100 mm × 100 mm). The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, which is taken as the mass per unit area.

[0065] "Thickness" is measured using an automatic thickness measuring instrument (KES-G5 Handy Compression Tester) under the following conditions: load: 0.098 N / cm ２ , and pressurized area: 2 cm ２ with automatic measurement performed under the above conditions.

[0066] Unless otherwise specified, the dimensions of each part refer to dimensions in the expanded state, not in the natural length state.

[0067] Unless otherwise specified, the tests and measurements shall be conducted in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%).

[0068] The present invention can be used not only for the pad-type disposable diapers described above, but also for tape-type disposable diapers, pant-type disposable diapers, and other absorbent articles in general.

[0069] 11...Top sheet, 20...Second sheet, 12...Absorbent, 12C...Front section, 12D...Constricted section, 12E...Rear section, 13...Back sheet, 14...Outer sheet, 15...Three-dimensional gather, 16...Gathered sheet, 17...Gathered elastic member, 18...Locking member, 31...Folded section, 40...First emboss, 41...First embossed area, 42...Second emboss, 43...Second embossed area, 44...First rectangular emboss, 45...First rectangular embossed area, 46...Second rectangular emboss, 47...Second rectangular embossed area, LD...Front-to-back direction, WD...Width direction.

Claims

1. A pad comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent between the top sheet and the back sheet, wherein a liquid-permeable second sheet with a width greater in the left-right direction than the top sheet is provided between the top sheet and the absorbent, the bases of three-dimensional gatherers extending in the front-rear direction are fixed to both sides of the second sheet in the left-right direction, the absorbent and both sides of the second sheet in the left-right direction extend further in the left-right direction than the base, a first embossed region is formed on both sides of the base at the folded portion when the second sheet is folded, and the length of the first embossed region in the front-rear direction is formed to be longer than the length of the folded portion.

2. The pad according to claim 1, wherein second embossed regions are formed on both sides of the first embossed region in the front-to-back direction, and the distance between the second emboss of the second embossed region in at least one of the front-to-back direction and the left-to-right direction is greater than the distance between the first emboss of the first emboss of the first embossed region in the front-to-back direction and the left-to-right direction.

3. The pad according to claim 2, wherein the longitudinal directions of the first emboss and the second emboss are arranged along the front-to-back direction, and in a side view, the front-to-back side portions of the first emboss and the front-to-back side portions of adjacent first emboss overlap.

4. The pad according to claim 2, wherein the first emboss and the second emboss are formed as rectangular rectangular embossings, the rectangular embossing positioned in front of the center line in the front-rear direction of the folded portion extends forward as it extends in the width direction, and the rectangular embossing positioned behind the center line in the front-rear direction of the folded portion extends backward as it extends in the width direction.

5. The fiber density of the second sheet is 0.01 to 0.08 g / cm³. ３ The pad according to any one of claims 1 to 4.

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