Disposable wearing article

Abstract

To provide a disposable wearing article with improved fitness in erected gathers of a folding type.SOLUTION: The above problem is solved by the following configuration. A front lodging portion 67F and a rear lodging portion 67B include a first portion 66a extending from a start end 61 to a center side in a width direction WD and a second portion 66b extending from a terminal end to the outside of the width direction WD. An erected portion 68 includes a third portion 66c continuing to the first portion 66a and a fourth portion 66d continuing to the second portion 66b. A gather elastic member 63 is not provided further in the start end 61 side than a second gather elastic member 63b along a boundary between the third portion 66c and the fourth portion 66d. A gather waterproof sheet 64 formed of a waterproof resin film covering almost the entire the third portion 66c is fixed to the erected portion 68, so that a high rigidity region is formed. The fourth portion 66d does not include the gather waterproof sheet 64. The number of sheet stacking of the fourth portions 66d is smaller than that of the third portions 66c. A bending is hard to occur in between the second gather elastic member 63b and the start end 61.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to a disposable wearable article equipped with lift-up gathers on both sides. [Background technology]

[0002] In general disposable diapers such as pad-type, tape-type, and pant-type, as well as sanitary napkins and other disposable wearable items, lift-up gathers that extend along the front-to-back direction and rise up from their starting end are provided on both sides of the surface in the width direction to prevent leakage of excrement (see, for example, Patent Documents 1 and 2).

[0003] While various structures exist for rise-up gathers, most rise-up gathers have the following basic structure: a main part extending from the starting end towards the center in the width direction, a front-folded portion formed by fixing the front end of the main part in a folded state, a rear-folded portion formed by fixing the rear end of the main part in a folded state, an unfixed rise-up portion located between the front-folded portion and the rear-folded portion of the main part, and multiple gather elastic members attached to the rise-up portion at intervals in the width direction, oriented along the front-to-back direction.

[0004] The rise-up gathers of disposable wearable items preferably make contact with the body surface at a shallower angle and over a wider area, and preferably rise higher with a narrower surface area (the area of ​​the main part occupying the surface of the disposable wearable item in its unfolded state). From this viewpoint, the front-folding portion and the rear-folding portion have a first portion extending from the starting end toward the center in the width direction, and a second portion extending outward in the width direction from the end of the first portion, and the rise-up portion has a third portion that continues from the first portion of the front-folding portion to the first portion of the rear-folding portion and the third portion of the front-folding portion 2 From the first part to the second part of the fallen section 2 A type having a fourth part following a part (hereinafter also referred to as the folded type) is preferred.

[0005] However, in this type of folded-over gather, although the boundary between the first and second parts is fixed at the collapsed section, the third and fourth parts of the subsequent risen section are not fixed. Depending on how it is worn, the folding position may not be limited to just the boundary between the third and fourth parts, but may fold at multiple points with gaps in between, potentially reducing the fit of the fourth part. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2021-69864 [Patent Document 2] Patent No. 7252084 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the main objective of the present invention is to improve the fit of a folded-over type riser gather. [Means for solving the problem]

[0008] The above problems are solved by the absorbent materials described below. <First aspect> A disposable wearable article having risen gathers provided on both sides of the surface in the width direction, which extend along the front-to-back direction and rise from their starting ends, The aforementioned rising gather has a main portion extending from the starting end toward the center in the width direction, a front-folded portion formed by fixing the front end of the main portion in a folded state and a rear-folded portion formed by fixing the rear end of the main portion in a folded state, an unfixed rising portion located between the front-folded portion and the rear-folded portion of the main portion, and a plurality of gathering elastic members attached to the rising portion at intervals in the width direction, which are aligned in the front-rear direction. The forward-leaning portion and the rear-leaning portion each have a first portion extending from the starting end toward the center in the width direction, and a second portion extending outward in the width direction from the end of the first portion, and the upright portion each has a third portion continuing from the first portion of the forward-leaning portion to the first portion of the rear-leaning portion, and a fourth portion continuing from the second portion of the forward-leaning portion to the second portion of the rear-leaning portion. The gathered elastic member is the 4 The part of the 3 It includes a first gathered elastic member attached to the end opposite to the portion, and a second gathered elastic member attached along the boundary between the third portion and the fourth portion, The gathering elastic member is not present on the starting end side of the second gathering elastic member. A gathered waterproof sheet made of a waterproof resin film covering the third portion is fixed to the raised portion so as to extend at least over the entire front-to-back direction of the raised portion. The gathered waterproof sheet extends from a position within 5 mm of the starting end side of the second gathered elastic member, to at least the starting end. The fixing area between the gathered waterproof sheet and the raised portion extends from a position within 5 mm toward the starting end of the end of the second gathered elastic member on the gathered waterproof sheet to at least the starting end. The third and fourth portions have gathered nonwoven fabric, and the fourth portion does not have a gathered waterproof sheet, and has fewer sheet layers than the third portion. Disposable wearable articles characterized by the following features.

[0009] (Effects and Benefits) The rise-up gathers of this disposable wearable item include a first gather elastic member attached to the end of the fourth section opposite to the third section, and a second gather elastic member attached along the boundary between the third and fourth sections. There is no gather elastic member on the starting end side of the second gather elastic member. As a result, the fourth section rises at a low angle and makes surface contact with the body, while the third section rises higher. Here, almost the entire third section of the fourth section is a high-rigidity region to which a particularly rigid waterproof resin film (gather waterproof sheet) is attached, and since the end of this region is lifted by the second gather elastic member, the folding position of the rise-up section is unlikely to occur anywhere other than along the second gather elastic member, and bending between the second gather elastic member and the starting end is particularly unlikely to occur. In other words, the third section that secures the rise-up height has high waterproofness due to the gather waterproof sheet, as well as high shape retention. On the other hand, the fourth section does not have a highly rigid waterproof resin film (gathered waterproof sheet) and has fewer sheet layers than the third section, so it comes into contact with the skin in a more flexible (low-rigidity) manner.

[0010] <Second aspect> absorbent material, The absorbent has a liquid-permeable top sheet provided on its front side, The top sheet has top sheet extensions that extend on both sides in the width direction of the absorbent, The aforementioned top sheet extension portion has a top sheet folded portion that is folded back to the front side at the starting end, The folded portion of the top sheet extends from the starting end to a position within ±5 mm in the width direction, with reference to the end of the second gathered elastic member on the gathered waterproof sheet, and is fixed to the gathered waterproof sheet. The fixing area between the folded top sheet portion and the gathered waterproof sheet extends from a position within 5 mm toward the starting end of the folded top sheet portion, beyond the end of the second gathered elastic member, to at least the starting end. A disposable wearable article of the first type.

[0011] (Function and effect) When the top sheet is extended laterally as in this embodiment, folded back along the main part of the rising gathers, and fixed to the rising part, the restoring force against the folding of the top sheet acts to raise the third part from the starting end, the rigidity in the third part is further improved, and bending between the second gather elastic member and the starting end becomes even less likely to occur.

[0012] <The third embodiment> It has a back waterproof sheet made of a waterproof resin film provided on the back side of the absorber, The back waterproof sheet has back waterproof sheet extension parts extending out on both sides in the width direction of the absorber, The back waterproof sheet extension parts have back waterproof sheet folded parts folded back to the front side at the starting end, The back waterproof sheet folded parts constitute the gather waterproof sheet, The disposable wearing article of the second embodiment.

[0013] (Function and effect) When the back waterproof sheet made of a waterproof resin film is extended laterally as in this embodiment, folded back along the main part of the rising gathers, and fixed to the rising part, it is preferable because the restoring force against the folding of the back waterproof sheet acts to raise the third part from the starting end.

[0014] <The fourth embodiment> It has an outer packaging non-woven fabric provided on the back side of the absorber, The outer packaging non-woven fabric has outer packaging extension parts extending out on both sides in the width direction of the absorber, The outer packaging extension parts have outer packaging folded parts folded back to the front side at the starting end, The outer packaging folded parts extend from the starting end to a position within ±5 mm in the width direction based on the end on the side of the second gather elastic member in the gather waterproof sheet, and are fixed to the gather waterproof sheet. The fixing area between the exterior folded portion and the gathered waterproof sheet extends from a position within 5 mm toward the starting end of the exterior folded portion compared to the end of the second gathered elastic member, to at least the starting end. A third type of disposable wearable article.

[0015] (Effects and Benefits) As in this embodiment, when the outer nonwoven fabric is extended laterally and folded back along the main portion of the rising gather and fixed to the rising portion, the restoring force of the outer nonwoven fabric against the fold acts to raise the third portion from the starting end, and the rigidity of the third portion is further improved, making it even less likely for bending to occur between the second gathered elastic member and the starting end.

[0016] <Fifth aspect> The rigidity of the third part, measured by the 45° cantilever method, is 80-150 mm. A disposable wearable article in any one of the four forms described above.

[0017] (Effects and Benefits) The rigidity of the third part is not limited, but it is preferable that it be within the scope of this embodiment in order to obtain the aforementioned advantages.

[0018] <Sixth aspect> The absorbent body has a constricted region in the width direction in the middle of the front-to-back direction, The distance in the width direction between the side edge of the narrowest part of the constricted region and the starting end is 5 to 20 mm. The distance in the width direction between the starting end and the second gathered elastic member is 10 to 25 mm. A disposable wearable article in any one of the following forms (2-5).

[0019] (Effects and Benefits) To improve the fit in the crotch area, it is common practice to provide a narrower constricted area in the middle of the absorbent in the front-to-back direction than on both the front and back sides. In this case, the area between the side edge of the constricted area and the starting end of the rise-up gather extends the rise-up height of the rise-up gather in the crotch area. However, having this extended portion makes the forces applied to the third part more complex, and unwanted bending is more likely to occur between the second gather elastic member and the starting end. Therefore, the improvement of the rigidity of the third part by the aforementioned gather waterproof sheet is particularly significant in this embodiment. [Effects of the Invention]

[0020] According to the present invention, advantages such as improved fit in folded-over type rise-up gathers are brought about. [Brief explanation of the drawing]

[0021] [Figure 1] This is a plan view showing the inner surface of a pad-type disposable diaper. [Figure 2] This is a cross-sectional view of line 1-1 in Figure 1. [Figure 3] This is a cross-sectional view of section 2-2 in Figure 1. [Figure 4] This is a cross-sectional view of Figure 1, section 1-1, when a pad-type disposable diaper is being worn. [Figure 5] Figure 1-1 is a cross-sectional view of another embodiment of a pad-type disposable diaper. [Figure 6] This is a magnified view of the cross-section of the key part of the rising gather. [Figure 7] Figure 1-1 is a cross-sectional view of another embodiment of a pad-type disposable diaper. [Modes for carrying out the invention]

[0022] The following describes an example of a pad-type disposable diaper in detail, with reference to the attached drawings. Each adjacent component in the thickness direction is fixed or joined as necessary, in the same way as known diapers, even in addition to the fixing or joining parts described below. The dotted pattern indicates adhesives such as hot melt adhesives used as fixing or joining means. Hot melt adhesives can be applied by known methods such as slot coating, continuous linear or dotted bead coating, spiral, Z-shaped, or wavy spray coating, or pattern coating (transfer of hot melt adhesive using a relief printing method). Alternatively, or in conjunction with these methods, in the fixing parts of elastic members, 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), polyolefin-based, and polyester / polyamide-based adhesives, but they can be used without particular limitation. As fixing or joining means for joining each component, material welding methods such as heat sealing or ultrasonic sealing can also be used. In areas where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or joining is performed with hot melt adhesive, intermittent pattern coating such as spiral, Z-shaped, or wavy can be suitably used. When coating an area exceeding the coating width of a single nozzle, intermittent pattern coating such as spiral, Z-shaped, or wavy can be performed with or without spacing in the width direction WD. As a joining means for joining each component, material welding methods such as heat sealing or ultrasonic sealing can also be used.

[0023] Furthermore, in the following description, 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, for example, polyolefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, polyamide-based fibers, etc. (including single-component fibers as well as composite fibers such as core-sheath fibers), 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 constituent fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that have become hydrophilic due to a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers that have become water-repellent due to 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 (including SMS nonwoven fabrics and SMMS nonwoven fabrics, etc., which have a meltblown layer sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

[0024] Figures 1 to 4 show an example of a pad-type disposable diaper 100. This pad-type disposable diaper 100 is used by placing it inside an outer garment such as a pant-type disposable diaper. It is narrow in width and does not have side flaps SF that extend laterally from the absorbent material 56. However, as shown in Figure 7, it may have a pair of side flaps SF that do not have the absorbent material 56 and extend laterally from both side edges of the absorbent material 56. The pad-type disposable diaper 100 in this example has a crotch area M, a front area F that extends forward from the crotch area M, and a rear area B that extends backward from the crotch area M. Here, the crotch area M means the range of the front-to-back direction LD that has the constricted area 56N if the absorbent material 56 has the constricted area 56N described later, and if the absorbent material 56 does not have the constricted area 56N, it means the part located in the center of the front-to-back direction LD and the dimension of the front-to-back direction LD is 20-30% of the total product length Y.

[0025] The pad-type disposable diaper 100 in this example is a rectangle with long sides (edges on both sides) running in the front-to-back direction, but it can be further modified as needed, such as by cutting out the four corners or cutting out the sides of the crotch area M.

[0026] As shown in Figures 1-4, the pad-type disposable diaper 100 in this example comprises an absorbent body 56 that absorbs and retains urine, a packaging sheet 58 that encloses the absorbent body 56, a top sheet 30 provided on the front side of the absorbent body 56, a back waterproof sheet 11 provided on the back side of the absorbent body 56, and lift-up gathers 60 that rise up from starting ends 61 that extend along the front-to-back direction LD, provided on both sides of the surface in the width direction WD.

[0027] (Top sheet) The top sheet 30 is permeable to liquids and can be made of, for example, a perforated or non-perforated nonwoven fabric or a perforated plastic sheet. Furthermore, the top sheet 30 may consist of a single sheet or a laminated sheet obtained by bonding two or more sheets together. Similarly, the top sheet 30 may consist of a single sheet or two or more sheets in the planar direction.

[0028] Both sides of the top sheet 30 extend to form part of the rising gather 60 as shown in the illustrated example, or they may be folded back to the back at the side edge of the absorbent element 50 and wrapped around to the back of the absorbent element 50 through the gap between the back waterproof sheet 11 and the rising gather 60, as shown in the example in Figure 5, or they may be allowed to protrude laterally from the side edge of the absorbent element 50 without being folded back at the side edge of the absorbent element 50, as shown in the example in Figure 7, to form part of the side flap SF.

[0029] It is desirable to fix the top sheet 30 to the adjacent component on the back side using a joining method that involves material welding, such as heat sealing or ultrasonic sealing, or by hot melt adhesive, in order to prevent misalignment with the component on the back side. In the illustrated example, the top sheet 30 is fixed to the portion of the packaging sheet 58 that is located on the front side of the absorbent 56 by hot melt adhesive applied to its back surface.

[0030] (Back waterproof sheet) The material of the back waterproof sheet 11 is not particularly limited, but examples include waterproof resin films made of polyolefin resins such as polyethylene and polypropylene, and waterproof nonwoven fabrics. From the viewpoint of preventing stuffiness, it is preferable to use a breathable material for the back waterproof sheet 11. As a breathable waterproof resin film, a microporous waterproof resin film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene and polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction is preferred.

[0031] (Absorbent) The absorbent body 56 can be formed from a fiber aggregate. This fiber aggregate can be made by stacking short fibers such as cotton pulp or synthetic fibers, or by opening filament aggregates obtained by, if necessary, towing (fiber bundles) of synthetic fibers such as cellulose acetate. For fiber basis weight, when using cotton pulp or stacked short fibers, for example, 100-450 g / m² is used. 2 It can be set to a certain extent, and in the case of filament aggregates, for example, 30-120 g / m². 2The fineness can be set to a certain extent. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimp of the crimped fibers can be, for example, 5 to 75 per 2.54 cm, preferably 10 to 50, and more preferably 15 to 50. Uniformly crimped fibers can also be used. It is preferable to disperse and retain highly absorbent polymer particles in the absorbent body 56.

[0032] The dimensions of the absorbent body 56 can be determined as appropriate, as long as it extends from a position in front of the crotch area M to a position behind the crotch area M, but it is preferable that it extends to the periphery of the product or its vicinity in the front-to-back direction LD and the width direction WD. Reference numeral 56X indicates the total width of the absorbent body 56, and reference numeral 56Y indicates the total length of the absorbent body 56.

[0033] The absorbent material 56 may be rectangular in shape, but as shown in Figure 1, it is preferable to have a front region F, a rear region B, and a constricted region 56N located between them that is narrower than the front region F and the rear region B (forming a roughly hourglass shape in plan view) because this improves the fit of the absorbent material 56 itself and the riser gather 60 around the legs. In this case, the width of the constricted region 56N (the width of the narrowest part of the absorbent material 56) can be determined as appropriate, but for example, it can be 0.5 to 0.8 times the total width 56X of the absorbent material 56.

[0034] (Highly absorbent polymer particles) The absorbent material 56 may contain superabsorbent polymer particles in part or in whole. Superabsorbent polymer particles include not only "particles" but also "powder." Superabsorbent polymer particles can be those used in this type of disposable diaper, and it is desirable that the percentage of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1:2006) is 30% by weight or less, and it is also desirable that the percentage of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1:2006) is 60% by weight or more.

[0035] While there are no particular limitations on the material used for the superabsorbent polymer particles, those with a water absorption capacity of 40 g / g or more are preferred. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials. Starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) polymers can be used. While the commonly used granular form is preferred for the superabsorbent polymer particles, other forms can also be used.

[0036] As superabsorbent polymer particles, those with a water absorption rate of 70 seconds or less, and particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent material 56 is likely to flow back out of the absorbent material 56, a phenomenon known as backflow.

[0037] Furthermore, as the superabsorbent polymer particles, those with a gel strength of 1000 Pa or more are preferably used. This effectively suppresses the sticky feeling after liquid absorption, even when a bulky absorbent material 56 is used.

[0038] The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorbent material 56. Therefore, it is not possible to say definitively, but it is generally between 50 and 350 g / m². 2 This can be achieved. The basis weight of the polymer is 50 g / m². 2Below 350g / m², it becomes difficult to ensure sufficient absorption. 2 Beyond a certain point, the effect saturates.

[0039] The ratio of fibers to superabsorbent polymer particles in the absorbent material 56 is not particularly limited; for example, the weight ratio of fibers to superabsorbent polymer particles can be 40:60 to 65:35.

[0040] (Packaging sheet) To ensure or improve the shape retention of the absorbent material 56, it is preferable to wrap the entire absorbent material 56 with a packaging sheet 58. The packaging sheet 58 may be omitted. When using a packaging sheet 58, the material can be tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, or a sheet with small holes. However, if the absorbent material 56 contains superabsorbent polymer particles, it is desirable that the sheet is one that prevents the superabsorbent polymer particles from escaping. When using nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite, etc. The basis weight should be 5-40 g / m². 2 Especially 10-30g / m 2 That would be preferable.

[0041] The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacturing and preventing leakage of highly absorbent polymer particles from the front and rear edges, it is preferable to wrap the sheet around the absorbent body 56 in a cylindrical shape so as to surround the front and back surfaces and both sides, with the front and rear edges protruding from the front and rear of the absorbent body 56, and to join the overlapping portions and the protruding portions using joining means such as hot melt adhesive or material welding.

[0042] (Outer nonwoven fabric) If it is undesirable for the back waterproof sheet 11 to be exposed on the back surface, such as when the back waterproof sheet 11 is a waterproof resin film, an outer nonwoven fabric 12 can be provided on the back surface of the product to cover the back waterproof sheet 11, as shown in the illustrated example. The outer nonwoven fabric 12 can also be omitted. On the outside of the outer nonwoven fabric 12, a connecting member 8 can be provided as needed, similar to known pad-type disposable diapers, to be fixed or attached to the outer diaper or underwear, or it may not be provided.

[0043] (Gathered up) The rising gathers 60 are provided on both sides of the surface in the width direction WD, rising from a starting end 61 that extends along the front-rear direction LD. Preferably, the rising gathers 60 are provided from the front region F to the rear region B, and in particular, they are preferred to extend from in front of the front end of the absorber 56 to behind the rear end of the absorber 56.

[0044] More specifically, the rise-up gather 60 shown in Figures 2 to 7 has a main portion 66 extending from a starting end 61 extending along the front-rear direction LD to the center side in the width direction WD, a front-folded portion 67F formed by fixing the front end of the main portion 66 in a folded state, a rear-folded portion 67B formed by fixing the rear end of the main portion 66 in a folded state, an unfixed rise-up portion 68 located between the front-folded portion 67F and the rear-folded portion 67B of the main portion 66, and multiple gather elastic members 63 attached to the rise-up portion 68 at intervals in the width direction WD, along the front-rear direction LD. The gather elastic members 63 are fixed to the rise-up portion 68 in an extended state along the front-rear direction LD. As a result, the rise-up portion 68 contracts together with the gather elastic members 63 and rises when at its natural length, and also extends together with the gather elastic members 63 in response to external forces, thereby conforming to (fitting) the surface of the body.

[0045] Furthermore, the raised gather 60 in the illustrated example is of the folded type, and the front folded portion 67F and the rear folded portion 67B have a first portion 66a extending from the starting end 61 toward the center in the width direction WD, and a second portion 66b extending from the end of the first portion 66a toward the outside in the width direction WD, and the raised portion 68 has a third portion 66c that continues from the first portion 66a of the front folded portion 67F to the first portion 66a of the rear folded portion 67B, and a fourth portion 66d that continues from the second portion 66b of the front folded portion 67F to the second portion 66b of the rear folded portion 67B.

[0046] Characteristically, the gathered elastic member 63 is 4th part 66d in 3rd part 66c The structure includes a first gathered elastic member 63a attached to the end opposite to the first gathered elastic member 63a, and a second gathered elastic member 63b attached along the boundary between the third portion 66c and the fourth portion 66d, with no gathered elastic member 63 on the side of the second gathered elastic member 63b toward the starting end 61. As a result, the fourth portion 66d lifts up at a low angle and makes surface contact with the body, while the third portion 66c rises higher. The fourth portion 66d may have one or a plurality of third gathered elastic members 63c spaced apart in the width direction WD between the first gathered elastic member 63a and the second gathered elastic member 63b.

[0047] Furthermore, a gathered waterproof sheet 64 made of a waterproof resin film covering the third portion 66c is fixed to the main portion 66 so as to extend over the entire front-rear direction LD of the main portion 66. The gathered waterproof sheet 64 extends from a position within 5 mm (more preferably within 3 mm) in the width direction WD toward the starting end 61 of the second gathered elastic member 63b to at least the starting end 61. The fixing area between the gathered waterproof sheet 64 and the main portion 66 extends from a position within 5 mm (more preferably within 3 mm) in the width direction WD toward the starting end 61 of the end of the gathered waterproof sheet 64 on the second gathered elastic member 63b side to at least the starting end 61. The gathered waterproof sheet 64 has a gathered nonwoven fabric 62 that extends over the third portion 66c and the fourth portion 66d, while the fourth portion 66d does not have a gathered waterproof sheet 64 and has fewer sheet layers than the third portion 66c. In the specific example shown in Figures 2 to 4, the third section 66c has 5 layers of sheet lamination (2 layers of gathered nonwoven fabric 62, 1 layer of outer nonwoven fabric 12, 1 layer of gathered waterproof sheet 64, and 1 layer of top sheet 30), whereas the fourth section 66d has 2 layers of sheet lamination (gathered nonwoven fabric 62 but(Only two layers) Therefore, in the rising gather 60 of this example, the third part 66c of the third part 66c and the fourth part 66d is almost entirely a high-rigidity region to which a particularly rigid waterproof resin film (gathered waterproof sheet 64) is attached, and since the end of it is lifted by the second gathered elastic member 63b, the folding position of the rising portion 68 is unlikely to occur anywhere other than along the second gathered elastic member 63b, and in particular bending between the second gathered elastic member 63b and the starting end 61 is unlikely to occur. In other words, the third part 66c, which secures the rising height, has high waterproofness due to the gathered waterproof sheet 64 and also has high shape retention. On the other hand, the fourth part 66d does not have a highly rigid waterproof resin film (gathered waterproof sheet 64) and has fewer sheet layers than the third part 66c, so it comes into contact with the skin in a flexible (low rigidity) manner. Unlike the illustrated example, the gathered waterproof sheet 64 may be provided so as to extend over the entire front-to-back direction LD of only the raised portion 68. Furthermore, from this viewpoint, it is preferable, as shown in Figures 2 and 3, that the gathered waterproof sheet 64 is joined to the inside of the gathered nonwoven fabric 62 (towards the center in the width direction WD) rather than sandwiching the gathered waterproof sheet 64 with the gathered nonwoven fabric 62 as shown in the example in Figure 5, because this is preferable because it is less likely to hinder the folding of the second portion 66b and the fourth portion 66d relative to the first portion 66a and the third portion 66c.

[0048] In the illustrated example, the first portion 66a and the third portion 66c have at least one layer of gathered nonwoven fabric 62 in addition to the gathered waterproof sheet 64, and the second portion 66b and the fourth portion 66d also have at least one layer of gathered nonwoven fabric 62. As the gathered nonwoven fabric 62, a dedicated nonwoven fabric may be provided, or an extension of the sheet near the starting end 61 may be used. In the illustrated example, the rising gather 60 is formed by a gather assembly 69 having the entire length and width extending from the first portion 66a to the fourth portion 66d. The gather assembly 69 has a gathered nonwoven fabric 62 having an inner layer 62a extending from the starting end 61 to the ends of the second portion 66b and the fourth portion 66d, and an outer layer 62b that is folded outward at the ends of the second portion 66b and the fourth portion 66d and extends to the starting end 61, and a gathered elastic member 63 sandwiched between the inner layer 62a and the outer layer 62b in the fourth portion 66d. The gathered assembly 69 may be joined to the opposing member at a base portion 65 that extends beyond the absorbent 56 to the back side via the rising start end 61, as in the example shown in Figure 5, or, as shown in Figures 2 and 3, if there is a main part combined member (a top sheet 30, a back waterproof sheet 11, and an outer nonwoven fabric 12 in the illustrated example) that extends from the center side in the width direction WD beyond the start end 61 through the start end 61 to the main part 66 (at least the first part 66a and the third part 66c), it may be joined to the main part component portion of that main part combined member (a folded portion of the top sheet 30, the back waterproof sheet 11, and the outer nonwoven fabric 12 in the illustrated example). In particular, in the latter case, it is preferable to position the side edge of the main component portion within 5 mm (more preferably within 3 mm) in the width direction WD toward the starting end 61 side of the second gathered elastic member 63b, as shown in the examples in Figures 2 to 4 and Figures 6(a) and 6(c), and to join the gathered assembly 69 to the outside of the main component portion, because this does not hinder the folding of the second portion 66b and the fourth portion 66d toward the first portion 66a and the third portion 66c. Conversely, as shown in Figure 6(b), the gathered assembly 69 can also be joined to the inside of the main component portion.

[0049] The top sheet 30 may be folded back to the back side of the absorber 56 along both side edges of the absorber 56, as shown in the example in Figure 5. However, as shown in Figures 2 and 3, the top sheet 30 has top sheet extension portions that extend on both sides of the absorber 56 in the width direction WD. The top sheet extension portions have top sheet folded-back portions that are folded back to the front side at the starting end 61. The top sheet folded-back portions extend from the starting end 61 to a position within ±5 mm (more preferably within ±3 mm) in the width direction WD with respect to the end of the second gathered elastic member 63b side of the gathered waterproof sheet 64, and are fixed to the gathered waterproof sheet 64. Preferably, the fixing area between the top sheet folded-back portion and the gathered waterproof sheet 64 extends from a position within 5 mm (more preferably within ±3 mm) in the width direction WD towards the starting end 61 from the end of the second gathered elastic member 63b side of the top sheet folded-back portion to at least the starting end 61. In other words, it is preferable that both sides of the top sheet 30 form at least the third portion 66c (and the first portion 66a in the illustrated example) of the rising gather 60. When the top sheet 30 is extended laterally and folded back along the main portion of the rising gather 60 and fixed to the rising portion 68, the restoring force of the top sheet 30 against the fold acts to raise the third portion 66c from the starting end 61, and the rigidity of the third portion 66c is further improved, making it even less likely for bending to occur between the second gathered elastic member 63b and the starting end 61. Furthermore, as in the illustrated example, it is preferable that the folded portion of the top sheet forms the innermost surface of the main portion 66 and covers almost or entirely the inner surface of the gathered waterproof sheet 64, as this makes it less likely for the waterproof resin film to come into contact with the skin.

[0050] The back waterproof sheet 11 is positioned only on the back side of the absorber 56, as shown in the example in Figure 5. The gathered waterproof sheet 64 may be made of a different waterproof resin film than the back waterproof sheet 11. However, if the back waterproof sheet 11 is made of a waterproof resin film, it is preferable that, as shown in Figures 2 and 3, the back waterproof sheet 11 has extended back waterproof sheet portions that extend to both sides in the width direction of the absorber 56, and these extended back waterproof sheet portions have folded back waterproof sheet portions that are folded back to the front side at the starting end 61, and these folded back waterproof sheet portions constitute the gathered waterproof sheet 64. In other words, it is preferable that both sides of the back waterproof sheet 11 form at least the third portion 66c (and the first portion 66a in the illustrated example) of the rising gather 60. This reduces the number of waterproof resin films used, and the restoring force of the back waterproof sheet 11 against the folding works to raise the third portion 66c from the starting end 61.

[0051] When an outer nonwoven fabric 12 is provided, the outer nonwoven fabric 12 has outer extension portions that extend on both sides of the absorbent body 56 in the width direction WD, and the outer extension portions have outer folded portions that are folded back to the front side at the starting end 61, and the outer folded portions extend from the starting end 61 to a position within ±5 mm (more preferably within ±3 mm) in the width direction WD with respect to the end on the second gathered elastic member 63b side of the gathered waterproof sheet 64, and are fixed to the gathered waterproof sheet 64, and it is preferable that the fixing area between the outer folded portion and the gathered waterproof sheet 64 extends from a position within 5 mm (more preferably within 3 mm) in the width direction WD towards the starting end 61 from the end on the second gathered elastic member 63b side of the outer folded portion to at least the starting end 61. In other words, it is preferable that both sides of the outer nonwoven fabric 12 form at least the third portion 66c (and the first portion 66a in the illustrated example) of the rising gather 60. In this way, by extending the outer nonwoven fabric 12 laterally and folding it back along the main portion of the rising gather 60, and fixing it to the rising portion 68, the restoring force of the outer nonwoven fabric 12 against the fold acts to raise the third portion 66c from the starting end 61, and the rigidity of the third portion 66c is further improved, making it even less likely for bending to occur between the second gathered elastic member 63b and the starting end 61. Furthermore, as shown in the illustrated example, it is preferable that the folded portion of the outer nonwoven fabric forms the outermost surface of the main portion 66 and covers the entire or almost entire outer surface of the gathered waterproof sheet 64, as this makes it less likely for the waterproof resin film to come into contact with the skin.

[0052] The end of the gathered waterproof sheet 64 on the side of the second gathered elastic member 63b and the end of the sheet that constitutes the third portion 66c other than the gathered assembly 69 (the top sheet 30 and the outer nonwoven fabric 12 in the illustrated example) on the side of the second gathered elastic member 63b may coincide (overlap in the thickness direction) or may be offset, as shown in Figures 2 to 4. For example, as shown in Figure 6(a), it is preferable that the sheets that constitute the third portion 66c other than the gathered assembly 69 and the gathered waterproof sheet 64 increase in width direction WD between their ends and the second gathered elastic member 63b by 5 mm or less (more preferably 3 mm or less) as the sheets move inward (i.e., in the order of outer nonwoven fabric 12, gathered waterproof sheet 64, and top sheet 30 in the illustrated example), as the thickness of the third portion 66c changes smoothly and the texture becomes pleasant to the touch.

[0053] Furthermore, as shown in Figure 6(b), it is preferable to make the distance WD in the width direction between the end of the gathered waterproof sheet 64 and the second gathered elastic member 63b greater than the distance WD in the width direction between the end of the sheet constituting the third portion 66c other than the gathered assembly 69 and the second gathered elastic member 63b, thereby concealing the entire gathered waterproof sheet 64. From a similar viewpoint, it is preferable that the sheets constituting the third portion 66c other than the gathered assembly 69 and the gathered waterproof sheet 64 increase in the distance WD in the width direction between their ends and the second gathered elastic member 63b by 5 mm or less (more preferably 3 mm or less) as the outer sheets (i.e., in the illustrated example, in the order of outer nonwoven fabric 12, gathered waterproof sheet 64, and top sheet 30) increase, thereby concealing the entire gathered waterproof sheet 64.

[0054] It is preferable that the rigidity of the entire third section 66c, measured by the 45° cantilever method, is 80 to 150 mm. The rigidity of each sheet constituting the third section 66c may be determined as appropriate, but it is preferable that the rigidity of the top sheet 30 by the 45° cantilever method is 10 to 80 mm (preferably 20 to 70 mm). It is also preferable that the rigidity of the outer nonwoven fabric 12 by the 45° cantilever method is 10 to 80 mm (preferably 20 to 70 mm). Furthermore, it is preferable that the rigidity of the gathered nonwoven fabric 62 by the 45° cantilever method is 10 to 80 mm (preferably 20 to 70 mm). Furthermore, since the fourth part 66d does not have a top sheet 30, a gathered waterproof sheet 64, and a back sheet, it has significantly lower rigidity compared to the third part 66c which has these components. Preferably, its rigidity is the same as or close to that of the third part 66c from which the top sheet 30, gathered waterproof sheet 64, and back sheet have been removed (0.2 to 0.8 times, more preferably 0.3 to 0.7 times, the rigidity of the third part 66c).

[0055] On the other hand, in order to improve the fit of the crotch area M, it is common practice to provide a narrower constricted area 56N in the middle of the front-to-rear LD of the absorber 56, as shown in Figure 1, which is narrower than both the front and rear sides. In this case, the area SA (see Figure 2) between the side edge of the constricted area 56N and the starting end 61 of the rising gather 60 expands the rising height of the rising gather 60 in the crotch area M. However, if, for example, the width WD dimension of this area SA is about 8 to 25 mm, and the distance d1 (see Figure 1) between the starting end 61 and the second gathering elastic member 63b in the width WD direction is about 10 to 25 mm, the force applied to the third part 66c becomes more complex due to the expansion of the rising height by area SA, and unwanted bending is more likely to occur between the second gathering elastic member 63b and the starting end 61. Therefore, the improvement of the rigidity of the third part 66c by the aforementioned gathering waterproof sheet 64 is particularly significant in such cases.

[0056] <Explanation of terms used in the specification> The following terms in this specification shall have the meanings set forth below, unless otherwise specified in this specification.

[0057] "Front-back direction" refers to the direction indicated by the symbol LD in the diagram (vertical direction), and "width direction" refers to the direction indicated by WD in the diagram (left-right direction). The front-back direction and the width direction are orthogonal to each other.

[0058] "Front side" refers to the side that is closer to the wearer's skin when worn, while "back side" refers to the side that is further away from the wearer's skin when worn.

[0059] "Front side" refers to the side that is closer to the wearer's skin when worn, while "back side" refers to the side that is further away from the wearer's skin when worn.

[0060] • "Elongation rate" refers to the value relative to the natural length, which is set at 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2.

[0061] The "gel strength" is measured as follows: 49.0 g of artificial urine (a mixture of urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97.09 wt%) is mixed with 1.0 g of superabsorbent polymer and stirred with a stirrer. The resulting gel is left in a constant temperature and humidity chamber at 40°C × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured using a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0062] "Weight" is measured as follows: After pre-drying the sample or test piece, leave it in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%) to reach a constant weight. Pre-drying means bringing the sample or test piece to a constant weight in an environment of 100°C. Note that pre-drying is not necessary for fibers with an official moisture content of 0.0%. Using a sample-taking template (100mm x 100mm), cut out a sample measuring 100mm x 100mm from the test piece that has reached a constant weight. Measure the weight of the sample, multiply it by 100 to calculate the weight per square meter, and this is the weight.

[0063] · The "thickness" of thick members such as the absorber 56, the absorption element 50, and the interior body 200 is measured using a thickness measuring instrument (Peacock, Dial Thickness Gauge, model H (measurement range 0 to 10 mm, circular terminal with a measurement area diameter of 10 mm, measurement force of approximately 1.7 N, pressure of approximately 21.7 KPa)) manufactured by Ozaki Manufacturing Co., Ltd. The sample and the thickness measuring instrument are placed horizontally for measurement. [[ID=A]] [[ID=B]]

[0064]

[0065] · The "thickness", "compressive rigidity LC in the thickness direction", and "recovery RC in the thickness direction" of thin sheets such as non-woven fabrics are measured using an automatic thickness measuring instrument (KES-G5 Handy Compression Measurement Program) under the conditions of load: 0.098 N / cm 2 and pressurized area: 2 cm 2 for automatic measurement.

[0066] · The water absorption amount is measured in accordance with JIS K7223-1996 "Test Method for Water Absorption Amount of Super Absorbent Resin".

[0067] · The water absorption rate is defined as the "time to the end point" when performing JIS K7224-1996 "Test Method for Water Absorption Rate of Super Absorbent Resin" using 2 g of super absorbent polymer and 50 g of physiological saline.

[0068] · The "deployed state" means a state where it is deployed flat without shrinkage (including any shrinkage such as shrinkage by elastic members) or slack.

[0069] · The dimensions of each part, unless otherwise specified, mean the dimensions in the deployed state rather than the natural length state. · When there is no description regarding the environmental conditions in the test or measurement, the test or measurement shall be conducted in a test chamber or apparatus under standard conditions (test location: temperature 23 ± 1 °C, relative humidity 50 ± 2%).

Industrial Applicability

[0070] The present invention is suitable for the pants-type disposable diaper as described in the above example.

Explanation of Reference Numerals

[0071] 11...Back waterproof sheet, 30...Top sheet, 56...Absorbent, 56N...Constricted area, 58...Packaging sheet, 60...Rising gather, 61...Starting end, 62...Gathered nonwoven fabric, 62a...Inner layer, 62b...Outer layer, 63...Gathered elastic member, 63a...First gathered elastic member, 63b...Second gathered elastic member, 63c...Third gathered elastic member, 64...Gathered waterproof sheet, 65...Base part, 66...Main part, 66a...First part, 66b...Second part, 66c...Third part, 66d...Fourth part, 67F...Front folded part, 67B...Rear folded part, 68...Rising part, 69...Gathered assembly, B...Rear area, F...Front area, LD...Front-to-back direction, M...Crotch area, WD...Width direction.

Claims

1. A disposable wearable article having risen gathers provided on both sides of the surface in the width direction, which extend along the front-to-back direction and rise from their starting ends, The aforementioned rising gather has a main portion extending from the starting end toward the center in the width direction, a front-folded portion formed by fixing the front end of the main portion in a folded state and a rear-folded portion formed by fixing the rear end of the main portion in a folded state, an unfixed rising portion located between the front-folded portion and the rear-folded portion of the main portion, and a plurality of gathering elastic members attached to the rising portion at intervals in the width direction, which are aligned in the front-rear direction. The aforementioned front-folding portion and the aforementioned rear-folding portion have a first portion extending from the starting end toward the center in the width direction, and a second portion extending outward in the width direction from the end of the first portion, and the aforementioned upright portion has a third portion continuing from the first portion of the front-folding portion to the first portion of the rear-folding portion, and a fourth portion continuing from the second portion of the front-folding portion to the second portion of the rear-folding portion. The gathered elastic member includes a first gathered elastic member attached to the end of the fourth portion opposite to the third portion, and a second gathered elastic member attached along the boundary between the third portion and the fourth portion. The gathering elastic member is not present on the starting end side of the second gathering elastic member. A gathered waterproof sheet made of a waterproof resin film covering the third portion is fixed to the raised portion so as to extend at least over the entire front-to-back direction of the raised portion. The gathered waterproof sheet extends from a position within 5 mm of the starting end side of the second gathered elastic member, to at least the starting end. The fixing area between the gathered waterproof sheet and the raised portion extends from a position within 5 mm toward the starting end of the end of the second gathered elastic member on the gathered waterproof sheet to at least the starting end. The third and fourth portions have gathered nonwoven fabric, and the fourth portion does not have a gathered waterproof sheet, and has fewer sheet layers than the third portion. Disposable wearable articles characterized by the following features.

2. absorbent material, The absorbent has a liquid-permeable top sheet provided on its front side, The top sheet has top sheet extensions that extend on both sides in the width direction of the absorbent, The aforementioned top sheet extension portion has a top sheet folded portion that is folded back to the front side at the starting end, The top sheet folded portion extends from the starting end to a position within ±5 mm in the width direction, with reference to the end of the second gathered elastic member side of the gathered waterproof sheet, and is fixed to the gathered waterproof sheet. The fixing area between the folded top sheet portion and the gathered waterproof sheet extends from a position within 5 mm toward the starting end of the folded top sheet portion, beyond the end of the second gathered elastic member, to at least the starting end. The disposable wearable article according to claim 1.

3. The absorbent has a back waterproof sheet made of a waterproof resin film provided on the back side, The back waterproof sheet has extended portions of the back waterproof sheet that extend on both sides in the width direction of the absorbent body. The extended portion of the back waterproof sheet has a back waterproof sheet folded portion that is folded back to the front side at the starting end, The folded portion of the back waterproof sheet constitutes the gathered waterproof sheet. The disposable wearable article according to claim 2.

4. The absorbent has an outer nonwoven fabric provided on the back side, The outer nonwoven fabric has outer extension portions that extend on both sides in the width direction of the absorbent, The exterior extension portion has an exterior folded portion that is folded back to the front side at the starting end, The aforementioned exterior folded portion extends from the starting end to a position within ±5 mm in the width direction, with reference to the end of the second gathered elastic member side of the gathered waterproof sheet, and is fixed to the gathered waterproof sheet. The fixing area between the exterior folded portion and the gathered waterproof sheet extends from a position within 5 mm toward the starting end of the exterior folded portion compared to the end of the second gathered elastic member, to at least the starting end. The disposable wearable article according to claim 3.

5. The rigidity of the third portion is 80 to 150 mm according to the 45° cantilever method. A disposable wearable article according to any one of claims 1 to 4.

6. The absorbent body has a constricted region in the width direction in the middle of the front-to-back direction, The distance in the width direction between the side edge of the narrowest part of the constricted region and the starting end is 5 to 20 mm. The distance in the width direction between the starting end and the second gathered elastic member is 10 to 25 mm. A disposable wearable article according to any one of claims 2 to 4.

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