Disposable wearing article

Abstract

To double the elastic member of the waist portion and improve the air permeability of the waist portion. The above problem is solved by having: a waist portion (23) having an outer side portion (60) exposed to an outer surface and an inner side portion (61) overlapping with an inner side thereof; a waist adjoining portion (22) continuously from the outer side portion (60) of the waist portion (23) to a crotch side; an outer side stretchable region (80) throughout the outer side portion (60) of the waist portion (23) and the waist adjoining portion (22); and an inner side stretchable region (63) provided to the inner side portion (61) of the waist portion (23), the outer side portion (60) and the inner side portion (61) being joined by a stripe pattern in which inner-outer joint portions (64) continuously in a front-rear direction (LD) and inner-outer non-joint portions (65) continuously in the front-rear direction (LD) are alternately repeated in a width direction (WD), a natural length of the outer side portion (60) in the width direction (WD) being 1.1 to 1.8 times a natural length of the inner side portion (61) in the width direction (WD).

Description

Technical Field

[0001] This invention relates to disposable wearable articles having a waist section that elastically stretches using an elastic membrane. Background Technology

[0002] In disposable clothing items such as disposable diapers, elasticity is typically applied to appropriate areas such as the leg openings or waistband to improve fit to the body. Conventionally, a common method for applying this elasticity is to install elongated elastic components such as rubber threads in a lengthwise extended state. In this case, it is also common to arrange multiple rubber threads at intervals in a direction perpendicular to the length direction to apply elasticity to an area of ​​a certain size. Furthermore, as a method to further improve the fit, an elastic membrane has been proposed to be installed in a lengthwise extended state (see, for example, Patent Document 1).

[0003] The stretchable region comprising the elastic membrane is formed as follows: with the elastic membrane stacked between the first and second layers and elongated along the stretching direction, the first and second layers are fused together through joint holes formed in the elastic membrane at a plurality of point-like joint portions spaced apart along and perpendicular to the stretching direction. Furthermore, regarding this stretchable region, in its natural length state, as the elastic membrane contracts between the joint portions, the spacing between the joint portions narrows, and folds extending in a direction intersecting the stretching direction are formed between the joint portions on the first and second layers. Conversely, during elongation, as the elastic membrane elongates between the joint portions, the spacing between the joint portions and the folds on the first and second layers expand, allowing elastic elongation to the fully unfolded state of the first and second layers. The stretchable area formed by this elastic membrane has the following advantages: not to mention the excellent fit of the surface, there is no bonding between the first and second layers and the elastic membrane, and the bonding between the first and second layers is also very small, so it is very soft. In addition, the bonding pores of the elastic membrane also help to improve breathability.

[0004] On the other hand, when using a stretchable area that includes such an elastic membrane, it is desirable to form the stretchable area over the largest possible range using the same elastic membrane in order to achieve uniformity in the texture of the outer surface. Therefore, for example, when imparting stretchability to both the waist and the waist-adjacent portion adjacent to the crotch side of a disposable garment, it is preferable that the same elastic membrane is continuous throughout both the waist and the waist-adjacent portion adjacent to the crotch side.

[0005] In addition, disposable clothing usually requires a strong waist-tightening force, while the tightening force of the adjacent waist area is preferred to be weaker than that of the waist.

[0006] However, in a simple structure with only one elastic membrane, it is difficult to significantly change the fastening force perpendicular to the direction of stretching when the portion has the same elastic membrane. Therefore, in such a simple structure, it is difficult to make the waist section have a sufficiently strong fastening force compared to the adjacent sections.

[0007] To address this issue, Patent Document 3 proposes increasing the number of elastic membrane layers by integrating a double-layer structure formed by folding the elastic membrane's stretchable region back at the waist. However, this raises concerns about reduced breathability at the waist.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2016-187387

[0011] Patent Document 2: Japanese Patent Application Publication No. 2013-183828

[0012] Patent Document 3: Japanese Patent Application Publication No. 2019-118581 Summary of the Invention

[0013] The problem that the invention aims to solve

[0014] Therefore, the main objective of this invention is to improve the breathability of the waist in a structure in which an elastic membrane is provided throughout the waist and the adjacent waist portion and the elastic component of the waist is double-layered.

[0015] Methods for solving problems

[0016] The disposable clothing items that solve the above problems are as follows.

[0017] <Method 1>

[0018] A disposable garment, characterized in that it has:

[0019] The waist, having an outer portion exposed to the outer surface and an inner portion overlapping its inner side; and

[0020] The waist-adjacent portion extends from the outer portion of the waist to the crotch side.

[0021] The disposable garment has an outer stretchable area extending over the outer portion of the waist and the adjacent portion of the waist, and an inner stretchable area located on the inner portion of the waist.

[0022] The outer stretchable region comprises: a first layer made of nonwoven fabric; a second layer made of nonwoven fabric; and an outer elastic membrane located between the first layer and the second layer and extending over the outer portion of the waist and the adjacent portion of the waist.

[0023] The first and second sheets are fused together at spaced-apart joints through joint holes penetrating the outer elastic membrane.

[0024] The outer telescopic region contracts in the width direction by means of the contraction of the outer elastic membrane, and is also capable of stretching in the width direction.

[0025] The inner telescopic region includes an inner elastic component.

[0026] The inner telescopic region contracts in the width direction by means of the contraction of the inner elastic member, and is also capable of stretching in the width direction.

[0027] The outer portion and the inner portion are joined together with a stripe pattern in which continuous inner and outer joints in the front-back direction and continuous inner and outer non-joints in the front-back direction alternate repeatedly in the width direction.

[0028] The natural length of the outer portion in the width direction is 1.1 to 1.8 times the natural length of the inner portion in the width direction.

[0029] (Effects)

[0030] In this disposable garment, firstly, since the outer portion of the waist and the outer stretchable area adjacent to the waist stretch and contract with the same outer elastic membrane, the waist and the adjacent waist have a uniform outer surface texture. Secondly, since there is not only an outer elastic membrane on the outer portion of the waist but also an inner elastic component on the inner portion of the waist, the elastic component of the waist becomes double-layered, making it easy to make the waist's fastening force stronger than that of the adjacent waist. Thirdly, since the outer and inner portions are joined together with a striped pattern, and the natural length of the outer portion in the width direction is 1.1 to 1.8 times the natural length of the inner portion in the width direction, in a wearing state where the natural length is included and the garment is slightly contracted, at the non-jointed portion, the outer portion floats up from the inner portion, forming a continuous air-permeable channel in the front-back direction between the outer and inner portions. Therefore, due to the presence of this air-permeable channel, the breathability of the waist can be improved compared to the structure described in Patent Document 3, which only doubles the structure of the waist.

[0031] Furthermore, the natural length of the outer portion in the width direction and the natural length of the inner portion in the width direction are measured under the condition that the outer portion and the inner portion are peeled off and separated as needed, such as by cutting off the outer portion and the inner portion.

[0032] <Method 2>

[0033] According to the disposable clothing of method 1, wherein,

[0034] The disposable garment has a fold-back component that folds back from the outer portion at the edge of the waist to the inner portion.

[0035] A vent hole is formed at the portion where the crease of the folding component intersects with the inner and outer non-jointing portions, extending through the folding component in the thickness direction.

[0036] (Effects)

[0037] When a folding component of this type is used, it is preferred because it is a simple manufacturing method that allows the outer and inner portions to be integrally formed in a flat state and then folded back at the boundary between the two portions to join them together. However, in this case, one end of the aforementioned ventilation channel formed between the outer and inner portions in the wearing state is blocked by the folding component. Although the folding component has breathability in the thickness direction, the improvement of breathability is suppressed.

[0038] In contrast, in this method, the aforementioned breathable channel formed between the outer and inner portions when worn is connected to the outside via a breathable hole formed at the waist edge of the folding member, resulting in particularly excellent breathability, and is therefore preferred.

[0039] <Third Method>

[0040] According to method 1 or method 2, the disposable clothing item,

[0041] The disposable garment has a fold-back component that folds back from the outer portion at the edge of the waist to the inner portion.

[0042] The folding component does not include an elastic membrane that folds back from the outer portion at the edge of the waist to the inner portion.

[0043] (Effects)

[0044] When a folding member of this type is used, it is preferred because it is a simple manufacturing method that involves integrally forming the outer and inner portions in a flat state and then folding them together at the boundary between the two portions. However, in this case, one end of the aforementioned ventilation channel formed between the outer and inner portions in the wearing state is blocked by the folding member. Although the folding member has breathability in the thickness direction, the improvement in breathability is particularly suppressed when the folding member includes an elastic membrane.

[0045] Therefore, as in this manner, the folding component preferably does not include an elastic membrane that folds back from the outer portion at the edge of the waist to the inner portion.

[0046] <Method 4>

[0047] A disposable garment according to any one of methods 1 to 3, wherein,

[0048] The inner elastic member is a plurality of slender elastic members arranged at intervals in the front-to-back direction and continuous in the width direction.

[0049] (Effects)

[0050] An elastic membrane can also be used as the inner elastic component, but in this case, the air permeability of the inner portion in the thickness direction must be reduced, thereby inhibiting the improvement of air permeability by the aforementioned air permeability channels. Therefore, as in this embodiment, it is preferable to provide multiple elongated elastic components at intervals as the inner elastic component.

[0051] <Fifth Method>

[0052] According to the fourth method of disposable clothing, among which,

[0053] The inner portion includes: an inner elastic member adjacent to the inner surface of the outer portion; and a covering layer covering the inner side of the inner elastic member, which is made of non-woven fabric.

[0054] The inner surface of the outer portion is joined to the outer surface of the cover layer of the inner portion by the stripe pattern.

[0055] (Effects)

[0056] In the case of a stretchable structure formed by an internal elastic component, the outer and inner sides of the stretchable structure are typically covered with a sheet such as non-woven fabric. Therefore, it is also possible to provide a pair of sheets sandwiching an outer elastic membrane at the outer portion and a pair of sheets sandwiching an inner elastic membrane at the inner portion. However, in particular, the reduced air permeability of the inner portion in the thickness direction inhibits the improvement of air permeability by the aforementioned air permeability channels, which is therefore undesirable. In contrast, when a rubber thread is used as the inner elastic component as in this embodiment and the inner elastic component is sandwiched between the outer portion and the covering non-woven fabric, the air permeability of the waist area in the thickness direction is improved, which is therefore preferable.

[0057] <Method 6>

[0058] According to method 1 or method 2, the disposable clothing item,

[0059] The disposable garment has a fold-back component that folds back from the outer portion at the edge of the waist to the inner portion.

[0060] The folding member has a first nonwoven fabric, a second nonwoven fabric, and an elastic membrane sandwiched between them throughout the outer and inner portions, and the first and second nonwoven fabrics are laminates fused together at spaced-apart joints through joint holes penetrating the elastic membrane.

[0061] The portions of the first nonwoven fabric, the second nonwoven fabric, and the elastic membrane located on the outer side respectively constitute the first layer, the second layer, and the outer elastic membrane.

[0062] The portion of the elastic membrane located on the inner side constitutes the inner elastic component.

[0063] The sheet joint is not provided at the crease of the folding member, and the sheet joints adjacent to the outer and inner sides of the crease of the folding member are narrower in the width direction than the sheet joints of other parts.

[0064] (Effects)

[0065] In this disposable garment, it is preferred that it be manufactured in a simple manner as follows: not only the waist-adjacent part and the outer part of the waist, but also the inner part of the waist are formed into a single layer in a flat state, and then the inner part is folded back to the inside of the outer part to join them together.

[0066] However, in this case, when a sheet joint is provided at the crease of the folding component, the edge of the waist becomes hard to the touch, which is not preferable. Furthermore, since the folding component easily bends along the edge of the sheet joint, the folded position is difficult to stabilize.

[0067] In contrast, in this case, since there is no joint at the crease, the skin feel of the waist edge does not become hard, and the folding position of the folding part is stable, so it is preferred.

[0068] <The 7th Method>

[0069] A disposable garment according to any one of methods 1, 2, 4 through 6, wherein,

[0070] The maximum extension of the outer portion in the width direction is equal to the maximum extension of the inner portion in the width direction.

[0071] The area ratio of the sheet joint of the outer portion in the inner and outer non-jointed portions is greater than the area ratio of the sheet joint of the outer portion in the inner and outer joined portions.

[0072] (Effects)

[0073] When the maximum extension of the outer portion in the width direction is equal to the maximum extension of the inner portion in the width direction, it is preferable to manufacture them since the structural components of the outer and inner portions have equal dimensions in the width direction. In this case, by making the inner portion smaller than the outer portion, the natural length of the outer portion in the width direction can be made longer than the natural length of the inner portion in the width direction. Furthermore, the natural length of the outer portion in the width direction can be adjusted according to the area ratio of the joint.

[0074] Here, even if the natural length in the width direction of the outer portion as a whole is the same, when the area ratio of the plate joint of the outer portion in the inner and outer non-joint portions is larger than the area ratio of the plate joint of the outer portion in the inner and outer joint portions, the natural length of the outer portion in the width direction at the inner and outer non-joint portions is longer compared to the case where their area ratios are equal. That is, at the inner and outer non-joint portions, the outer portion tends to rise higher from the inner portion.

[0075] <The 8th Method>

[0076] According to any one of the embodiments 1 to 7, the disposable garment is a shorts-type disposable garment, which includes: an integral outer body extending from the front to the back, or outer bodies separately disposed in the front and back parts; an inner body installed in the middle of the width direction of the outer body and extending to the front and back sides of the crotch; side closures formed by joining the two sides of the outer body in the front part and the two sides of the outer body in the back part; and a waist opening and a pair of leg openings.

[0077] The outer body has the waist section and the waist adjacent section.

[0078] (Effects)

[0079] The aforementioned elastic waist structure, as described in this method, is suitable for the outer body of disposable shorts-type garments.

[0080] Invention Effects

[0081] According to the present invention, the following advantages are achieved: in a structure in which an elastic membrane is provided throughout the waist and the adjacent waist portion and the elastic component of the waist is double-layered, the breathability of the waist portion can be improved. Attached Figure Description

[0082] Figure 1 This is a top view (inner surface side) of a shorts-type disposable diaper in its unfolded state.

[0083] Figure 2 This is a top view (outer surface side) of a shorts-type disposable diaper in its unfolded state.

[0084] Figure 3 This is a top view showing only the main parts of a shorts-type disposable diaper in its unfolded state.

[0085] Figure 4 In the middle, (a) is along Figure 1 (b) is a cross-sectional view along the CC line. Figure 1 A cross-sectional view of the EE line.

[0086] Figure 5 It is along Figure 1 A cross-sectional view along line AA in the diagram.

[0087] Figure 6 It is along Figure 1 A cross-sectional view of the BB line.

[0088] Figure 7 In the diagram, (a) is a top view of the main part of the stretchable area, (b) is a cross-sectional view along line DD in (a), (c) is a cross-sectional view in the wearing state, and (d) is a cross-sectional view in the natural length state.

[0089] Figure 8 It is a cross-sectional view that schematically shows the main part of the outer casing, which has been stretched to a certain extent.

[0090] Figure 9 In the diagram, (a) is a top view of the main part of the stretchable area, (b) is a cross-sectional view along line DD in (a), (c) is a cross-sectional view in the wearing state, and (d) is a cross-sectional view in the natural length state.

[0091] Figure 10 It is a top view showing various arrangements of the joints.

[0092] Figure 11 This is a top view of the expanded area.

[0093] Figure 12 It is a top view showing the main part of the expanded area in its extended state, magnified.

[0094] Figure 13 It is a top view that enlarges the main part of the stretchable area in its natural length state.

[0095] Figure 14 In the middle, (a) is along Figure 12 (a) is a cross-sectional view of the DD line in the figure, and (b) is a cross-sectional view of the natural length state.

[0096] Figure 15 This is a top view of the expanded area.

[0097] Figure 16 It is a top view showing the main part of the expanded area in its extended state, magnified.

[0098] Figure 17 It is a top view that enlarges the main part of the stretchable area in its natural length state.

[0099] Figure 18 This is a schematic diagram of an ultrasonic sealing device.

[0100] Figure 19 In the image, (a) is a top view showing the main part in its unfolded state before the outer and inner parts are joined, and (b) is a cross-sectional view through the inner and outer joint. Figure 19 (c) is a cross-sectional view through the inner and outer non-jointed parts.

[0101] Figure 20 It shows the main part of the outer body that has been stretched to a certain extent, along Figure 1 A cross-sectional view of the GG line in the image.

[0102] Figure 21In the diagram, (a) is a top view of the main part in its unfolded state before the outer and inner parts are joined, (b) is a cross-sectional view through the inner and outer joint, and (c) is a cross-sectional view through the inner and outer non-jointed parts.

[0103] Figure 22 In the diagram, (a) is a top view of the main part in its unfolded state before the outer and inner parts are joined, (b) is a cross-sectional view through the inner and outer joint, and (c) is a cross-sectional view through the inner and outer non-jointed parts.

[0104] Figure 23 In the diagram, (a) is a top view of the main part in its unfolded state before the outer and inner parts are joined, (b) is a cross-sectional view through the inner and outer joint, and (c) is a cross-sectional view through the inner and outer non-jointed parts.

[0105] Figure 24 In the diagram, (a) and (b) are both sectional views showing the main part of the inner and outer joint. Detailed Implementation

[0106] The following describes in detail, using the example of a shorts-type disposable diaper, a disposable garment that incorporates an elastic membrane at the waist. Additionally, the dotted areas in the cross-sectional view represent adhesives used as a joining method to connect the various structural components. Hot melt adhesives can be applied using known methods such as slit application, continuous linear or dotted droplet application, spiral, zigzag, or wavy spray application, or patterned application (transfer of hot melt adhesive via letterpress printing). At the fixing portion of the elastic component, hot melt adhesive can be applied to the outer peripheral surface of the elastic component, either as an alternative to or in conjunction with these methods, to fix the elastic component to adjacent components. Hot melt adhesives include, for example, EVA-based, adhesive rubber-based (elastic system), olefin-based, polyester, and polyamide-based adhesives, and can be used without particular limitation. As a joining method to connect the various structural components, methods based on material fusion, such as heat sealing or ultrasonic sealing, can also be employed.

[0107] Figures 1-6A shorts-type disposable diaper is shown. The designation LD (longitudinal) indicates the front-to-back direction, and WD indicates the width direction. This shorts-type disposable diaper (hereinafter simply referred to as a diaper) has: an outer body 20, which constitutes a front portion F and a back portion B; and an inner body 10, which is fixed to the inner surface of the outer body 20 to form a single unit. The inner body 10 is formed by placing an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12. During manufacturing, after the back side of the inner body 10 is bonded to the inner surface (upper surface) of the outer body 20 by means of a hot-melt adhesive, the inner body 10 and the outer body 20 are folded at the boundary between the front portion F and the back portion B, i.e., at the center of the front-to-back direction LD (longitudinal), so that their two sides are joined together by a hot-melt weld or a hot-melt adhesive to form a side seal 21, thereby becoming a shorts-type disposable diaper with a waist opening and a pair of leg openings on the left and right sides.

[0108] (Example of an internal component)

[0109] like Figures 4-6 As shown, the inner body 10 has a structure in which the absorbent 13 is positioned between the top sheet 11 and the liquid-impermeable sheet 12 made of polyethylene or the like, thereby absorbing and retaining the excrement that has permeated through the top sheet 11. The planar shape of the inner body 10 is not particularly limited, but is generally as follows... Figure 1 It is formed into a roughly rectangular shape as shown.

[0110] The top sheet 11, which covers the front side (skin side) of the absorbent 13, can be made of porous or non-porous nonwoven fabric, porous plastic sheet, etc. Here, the nonwoven fabrics that can be used in this article, including the top sheet 11, are as follows: That is, as the constituent fibers of the nonwoven fabric, in addition to synthetic fibers such as polyethylene, polypropylene or copolymers thereof (e.g., polyethylene, copolymers containing ethylene as a copolymer component), olefinic fibers, polyester fibers, polyamide fibers, etc. (including composite fibers such as core and sheath fibers in addition to single-component fibers), regenerated fibers such as rayon or cuprammonium fiber, natural fibers such as cotton, etc., can be selected without particular limitation, and they can also be mixed. To improve the softness of the nonwoven fabric, the constituent fibers are preferably crimped fibers. Furthermore, the constituent fibers of the nonwoven fabric can be hydrophilic fibers (including fibers that are hydrophilic by means of a hydrophilic agent), hydrophobic fibers, or water-repellent fibers (including fibers that are water-repellent by means of a water-repellent agent). In addition, nonwoven fabrics are usually classified according to fiber length, sheet formation method, fiber bonding method, and lamination structure into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermally rolled (hot air) nonwoven fabrics, needle-punched nonwoven fabrics, dot-bonded nonwoven fabrics, and laminated nonwoven fabrics (such as SMS nonwoven fabrics and SMMS nonwoven fabrics with meltblown layers sandwiched between spunbond layers). Any of these nonwoven fabrics can be used.

[0111] As the liquid-impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene can be used. In particular, from the viewpoint of preventing stuffiness, a moisture-permeable sheet can be used appropriately. For example, a microporous sheet obtained by means of melting and mixing an inorganic filler material in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction.

[0112] As the absorbent 13, known materials can be used, such as aggregates of pulp fibers, cellulose acetate filaments, or nonwoven fabrics, and materials in which highly absorbent polymers are mixed or fixed as needed. In order to maintain the shape and polymer, the absorbent 13 can be packaged with packaging sheets 14 that have liquid permeability and liquid retention properties, such as crepe paper, as needed.

[0113] The absorbent body 13 is shaped like an hourglass, with a narrower portion 13N in the crotch area that is narrower than the front and back sides. The size of the narrower portion 13N can be appropriately determined; its front-to-back length can be approximately 20-50% of the total length of the diaper, and the width of its narrowest part can be approximately 40-60% of the total width of the absorbent body 13. When the narrower portion 13N is provided, if the planar shape of the inner body 10 is approximately rectangular, a non-absorbent side 17 without the absorbent body 13 is formed on the inner body 10 corresponding to the narrower portion 13N of the absorbent body 13.

[0114] The impermeable sheet 12, together with the top sheet 11, is folded back towards the back side on both sides of the absorber 13 in the width direction. As this impermeable sheet 12, a microporous sheet obtained by the following method can be appropriately used: after molding a sheet by compounding calcium carbonate, titanium dioxide, zinc oxide, silica, clay, talc, barium sulfate, or other pigments or inorganic fillers into an olefin resin such as polyethylene or polypropylene, it is stretched in a uniaxial or biaxial direction. Furthermore, as the impermeable sheet 12, a sheet with improved waterproofness using non-woven fabric as the base material can also be used.

[0115] Three-dimensional pleats 90, suitable for leg circumference, are formed on both sides of the inner body 10. For example... Figure 5 and Figure 6As shown, the three-dimensional pleated portion 90 includes: a fixing portion 91, which is fixed to the side of the back of the inner body 10; a main body portion 92, which extends from the fixing portion 91, passing through the side of the inner body 10, and above the side of the front of the inner body 10; a folded portion 93, which is formed by fixing the front and rear ends of the main body portion 92 to the side of the front of the inner body 10 (top piece 11 in the example) in a folded state using a hot melt adhesive 95b or the like; and a free portion 94, which is formed by not fixing the folded portions 93 together. These portions are formed by pleated pieces 95, which are formed by folding back a sheet of non-woven fabric or the like to form a double-layered sheet. The pleated pieces 95 are installed throughout the entire front-rear direction of the inner body 10, the folded portions 93 are positioned in front of and behind the non-absorbent side 17, and the free portions 94 extend to the front and rear sides of the non-absorbent side 17. Furthermore, a pleat elastic member 96 is provided between the double-layered pleated pieces 95, at the end of the free portion, etc. The pleat elastic member 96 is used to ensure that, in the product state, such as Figure 5 As shown, the free part 94 is raised by means of elastic contraction.

[0116] The fixing structure of the pleated elastic component 96 and the pleated piece 95 is not particularly limited; for example, it can be as follows: Figure 5 and Figure 6 As shown in the example, the structure is as follows: outside the collapsed portion 93, the pleated elastic member 96 is bonded to the pleated piece 95 by means of a hot melt adhesive at the location of the pleated elastic member 96, and the opposing surfaces of the pleated pieces 95 are joined together. However, in the collapsed portion 93, there is no hot melt adhesive at the location of the pleated elastic member 96, so the pleated elastic member 96 and the pleated piece 95 are not bonded together, and the opposing surfaces of the pleated pieces 95 are not joined together at the location where the pleated elastic member 96 is located.

[0117] The pleated elastic component 96 can be made of commonly used materials such as styrene-based rubber, olefin-based rubber, polyurethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene polymer, silicone, and polyester. Furthermore, to minimize visibility from the outside, it is suitable to have a thickness of 925 dtex or less, a tension of 150–350%, and a spacing of 7.0 mm or less. In addition to the elongated shape shown in the illustrated example, the pleated elastic component 96 can also be a strip with a certain width.

[0118] Regarding pleated fabric 95, in order to prevent urine from seeping through, and in order to prevent rashes and improve skin feel (dryness), it is desirable to use nonwoven fabrics coated with water-repellent agents such as silicone-based, paraffin-based, and alkyl chromic chloride-based water-repellent agents.

[0119] like Figures 3-6As shown, the back surface of the inner body 10 is bonded to the inner surface of the outer body 20 in the inner and outer fixing regions 10B (diagonal lines) by hot melt adhesive or the like. Regarding the inner and outer fixing regions 10B, it can be appropriately determined that they are almost integral in the width direction WD of the inner body 10, but it is preferable that the two ends in the width direction are not fixed to the outer body 20.

[0120] (Example of an external component)

[0121] The outer garment 20 has at least a waist portion T of the front body portion F and a waist portion T of the back body portion B. In the illustrated example, it also has a middle portion L, which is the area in the front-to-back direction between the waist portion T of the front body portion F and the waist portion T of the back body portion B. The planar shape of the outer garment 20 is such that leg openings are formed on both sides 29 in the width direction of the middle portion L, thus narrowing the middle portion L (the width of the middle portion L is narrower than the width of the waist portion T). The outer garment 20 can be configured such that the outer garment 20 is formed in both the front body portion F and the back body portion B, and the two are separated at the crotch area along the front-to-back direction LD of the diaper.

[0122] The waist portion T of the outer body 20 extends in the front-to-back direction, including the side sealing portion 21. The waist portion T has a waist section 23 forming a waist opening, with an outer portion 60 protruding outwards and an inner portion 61 overlapping its inner side. The portion extending from the outer portion 60 of the waist portion 23 in the front body portion F and the outer portion 60 of the waist portion 23 in the rear body portion B to the crotch side is the waist abutment portion 22. Generally, if there is a boundary within the waist portion T where the elongation stress (contraction force during elongation) changes in the width direction WD, the portion closer to the waist opening side than the boundary closest to the waist opening side becomes the waist portion 23; otherwise, the portion closer to the waist opening side than the absorbent body 13 or the inner body 10 becomes the waist portion 23. Their dimensions in the front-to-back direction LD vary depending on the product size and can be appropriately determined, but as an example, the dimension of the waist portion 23 in the front-to-back direction LD can be 20–40 mm. Furthermore, the two sides of the middle part L narrow in a U-shape or curve along the wearer's leg circumference, thus becoming the part along the wearer's leg circumference. Regarding the outer garment 20, as shown in the example, at the crotch area, the side edge of the outer garment 20 can be closer to the center side in the width direction than the side edge of the inner garment 10, or the side edge of the outer garment 20 can be further outward in the width direction than the side edge of the inner garment 10.

[0123] Furthermore, regarding the outer portion 60 of the waist 23 and the adjacent portion 22, except for the middle part of the middle portion L in the front-rear direction LD, as... Figure 2 and Figures 4-6As shown, it also includes a first layer 20A located on the outer side, a second layer 20B located on the inner side, and an outer elastic membrane 30 located between the first layer 20A and the second layer 20B and extending over the outer portion 60 of the waist portion 23 and the waist adjacent portion 22. Furthermore, as... Figure 7 and Figure 9 As shown, the first layer 20A and the second layer 20B are joined together at multiple spaced-apart joints 40 through joint holes 31 penetrating the outer elastic membrane 30. That is, the outer body 20 is a telescopic member including the outer elastic membrane 30. Hereinafter, the structure formed by stacking the first layer 20A, the second layer 20B, and the outer elastic membrane 30 is also referred to as the elastic membrane telescopic structure 20X.

[0124] In the front and rear waist sections 23 and the portion located between them, the outer elastic membrane 30 may be omitted from a portion of the waist adjacent section 22, provided that it is continuous from the waist section 23 to the waist adjacent section 22. For example, as shown in the example of the outer casing 20, it may be a structure in which the outer elastic membrane 30 is not provided only in the middle of the front-rear direction LD of the middle section L, or a structure in which the outer elastic membrane 30 is not provided throughout the entire range of the middle section L. Of course, the outer elastic membrane 30 may also be continuous throughout the entire front-rear direction LD range of the outer casing 20, including the middle section L.

[0125] (Joint structure of the plate joint)

[0126] When the bonding of the first sheet layer 20A and the second sheet layer 20B at the sheet bonding portion 40 is carried out through the bonding hole 31 formed in the outer elastic membrane 30, it is preferable that at least at positions other than between the first sheet layer 20A and the second sheet layer 20B at the sheet bonding portion 40, the first sheet layer 20A and the second sheet layer 20B are not bonded to the outer elastic membrane 30.

[0127] When the first sheet 20A and the second sheet 20B are fused together at the sheet joint 40 through the joining hole 31 of the outer elastic membrane 30, both the first sheet 20A and the second sheet 20B may be fused and solidified at the sheet joint 40, or only one of the first sheet 20A and the second sheet 20B may be fused and solidified at the sheet joint 40. Furthermore, the fused and solidified material of the outer elastic membrane 30 may also be sandwiched within the sheet joint 40.

[0128] Layer 1 20A and Layer 20B can be as follows: Figure 8 As shown in example (a), the melting and solidification can be uniform throughout the entire thickness direction and the entire planar direction of the sheet joint 40, or it can be as follows: Figure 8 As shown in the gradient of the dot pattern in (b) and (c), the melting and solidification are uneven. For example, the first layer 20A and the second layer 20B can be as follows: Figure 8As shown in example (b), the degree of melting is lower the closer to the outer side of the sheet joint 40 in the thickness direction. This state includes: a state in which approximately all the fibers of the first sheet 20A and the second sheet 20B are not melted on the surface of the sheet joint 40; a state in which the molten solidified material of the first sheet 20A and the second sheet 20B and the unmelted fibers are mixed on the surface of the sheet joint 40; and a state in which the degree of melting varies even though the fibers of the first sheet 20A and the second sheet 20B are melted throughout the entire thickness direction of the sheet joint 40.

[0129] Regardless of whether there is a change in the degree of melting in the thickness direction of the aforementioned sheet joint 40, the first sheet 20A and the second sheet 20B can be as follows: Figure 8 As shown in example (c), the degree of melting is lower closer to the periphery of the sheet joint 40. This state includes: a state in which almost all the fibers of the first sheet layer 20A and the second sheet layer 20B are not melted at the periphery of the sheet joint 40 (however, this is limited to the case where the molten solidified material of the outer elastic membrane 30 described later is sandwiched as an adhesive); a state in which the molten solidified material of the first sheet layer 20A and the second sheet layer 20B and unmelted fibers are mixed at the periphery of the sheet joint 40; and a state in which the degree of melting varies even though the fibers of the first sheet layer 20A and the second sheet layer 20B are melted throughout the entire planar direction of the sheet joint 40.

[0130] In addition, in these states, in the case of fiber melting in the first layer 20A and the second layer 20B, in addition to the case of complete fiber melting, there is also the case of the core of the fiber (including not only the core in the composite fiber, but also the central part of the single-component fiber) remaining but the surrounding part (including not only the sheath in the composite fiber, but also the surface side part of the single-component fiber) melting.

[0131] Furthermore, the state in which the molten solidified material of the outer elastic membrane 30 remains in the sheet joint 40 includes the following states: a state in which it is almost not mixed with the first sheet layer 20A or its molten solidified layer and the second sheet layer 20B or its molten solidified layer and remains in a layered state; a state in which it is mixed with the molten solidified portion of the first sheet layer 20A and the second sheet layer 20B; and a state in which it penetrates to a certain extent between the fibers of the unmolten solidified side of the first sheet layer 20A and the second sheet layer 20B, or between the residual fibers (including the core) of the molten solidified side of the first sheet layer 20A and the second sheet layer 20B.

[0132] The state in which the molten solidified material of the outer elastic membrane 30 remains in the sheet joint 40 can be manufactured by: under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the outer elastic membrane 30, the outer elastic membrane 30 is sandwiched between the first sheet layer 20A and the second sheet layer 20B, and pressure / heat is applied to the part that becomes the sheet joint 40, so that at least one of the first sheet layer 20A and the second sheet layer 20B and the outer elastic membrane 30 melt.

[0133] In this case, the melting point of the outer elastic film 30 is preferably about 80 to 145°C, and the melting points of the first layer 20A and the second layer 20B are preferably about 85 to 190°C, particularly preferably about 150 to 190°C. The difference between the melting points of the first layer 20A and the second layer 20B and the melting point of the outer elastic film 30 is preferably about 60 to 90°C. Furthermore, the heating temperature is preferably about 100 to 150°C.

[0134] Figure 18 An example of a suitable ultrasonic sealing device is shown. In this ultrasonic sealing device, when forming the sheet joint 40, a first sheet layer 20A, an outer elastic membrane 30, and a second sheet layer 20B are fed between a support roller 100 and an ultrasonic welding head 101, wherein the support roller 100 has protrusions 100a formed on its outer surface according to the pattern of the sheet joint 40. At this time, for example, by making the feeding speed of the outer elastic membrane 30 on the upstream side based on the feeding drive roller 103 and the clamping roller 102 slower than the feeding speed after the support roller 100 and the ultrasonic welding head 101, the outer elastic membrane 30 is stretched to a predetermined elongation rate in the MD direction (machine direction, conveying direction) along the path from the clamping position based on the feeding drive roller 103 and the clamping roller 102 to the sealing position based on the support roller 100 and the ultrasonic welding head 101. The elongation of the outer elastic membrane 30 can be set by selecting the speed difference between the support roller 100 and the feed drive roller 103, for example, it can be about 300% to 500%.

[0135] The first sheet 20A, the outer elastic membrane 30, and the second sheet 20B, fed between the support roller 100 and the ultrasonic welding head 101, are stacked in this order. While being pressed between the protrusion 100a and the ultrasonic welding head 101, they are heated by the ultrasonic vibration energy of the ultrasonic welding head 101. Only the outer elastic membrane 30 melts, or at least one of the first sheet 20A and the second sheet 20B, along with the outer elastic membrane 30, melts, thereby forming a joining hole 31 on the outer elastic membrane 30. Simultaneously, the first sheet 20A and the second sheet 20B are joined together through this joining hole 31. Therefore, in this case, by selecting the size, shape, separation interval, roller length direction, and circumferential arrangement pattern of the protrusion 100a of the support roller 100, the area ratio of the sheet joint 40 can be selected.

[0136] The reason for forming the joining hole 31, while not necessarily clear, can be considered as follows: the portions of the first layer 20A and the second layer 20B corresponding to the protrusion 100a of the support roller 100 remain connected to the surroundings (do not detach from the surroundings), while the portion of the outer elastic membrane 30 corresponding to the protrusion 100a of the support roller 100 melts and detaches from the surroundings, thereby creating the hole. At this time, as... Figure 7 (a) and (b) Figure 9 (a) and (b) Figure 12 and Figure 13 As shown, the portion of the outer elastic membrane 30 between adjacent joint holes 31 arranged side by side in the expansion direction ED is cut off from both sides of the expansion direction by the joint holes 31 and loses the support on both sides of the contraction direction. Therefore, within the range that can maintain continuity in the direction perpendicular to the contraction direction, the closer to the central side of the direction LD perpendicular to the expansion direction ED, the more it contracts towards the central side of the expansion direction until it reaches equilibrium, thereby expanding the joint hole 31 in the expansion direction ED.

[0137] Regarding the constituent materials of the first layer 20A and the second layer 20B, any nonwoven fabric in which at least a portion of the fibers can be welded (i.e., containing a thermoplastic resin component) can be used without particular limitation. Examples include olefin-based, polyester-based, polyamide-based, and other synthetic fibers such as polyethylene or polypropylene, blended fibers using two or more of these, or composite fibers containing two or more of these components (e.g., core-sheath type fibers where the sheath component is easily meltable). Furthermore, the nonwoven fabric can be manufactured through any processing.

[0138] The weight per unit area of ​​the nonwoven fabric used in the first layer 20A and the second layer 20B is preferably about 10-25 g / m². 2 In addition, such as Figure 24As shown, part or all of the first layer 20A and the second layer 20B can be a pair of layers formed by folding a single sheet of nonwoven fabric back and placing them opposite each other. That is, a single sheet of nonwoven fabric can be folded back at the waist opening edge as shown in the example, with the fold as the boundary, one side is designated as the second layer 20B and the other side as the first layer 20A, so that the outer elastic membrane 30 is located between the first layer 20A and the second layer 20B. Of course, as shown in other figures, the constituent materials of the first layer 20A and the second layer 20B can also be separately provided throughout the entire front-to-back direction LD.

[0139] As the outer elastic membrane 30, in addition to a non-porous membrane, a membrane with multiple pores or slits can also be used for air permeability. A particularly preferred outer elastic membrane 30 is one with a tensile strength of 8–25 N / 35 mm in the width direction WD (tension directions ED, MD), a tensile strength of 5–20 N / 35 mm in the front-to-back direction LD (directions perpendicular to the tension directions XD, CD), a tensile elongation of 450–1050% in the width direction WD, and a tensile elongation of 450–1400% in the front-to-back direction LD. The thickness of the outer elastic membrane 30 is not particularly limited, but is preferably about 20–40 μm.

[0140] (Outer expansion / contraction area)

[0141] The outer portion of the waist 23 and the waist-adjacent portion 22 in the outer body 20 have an outer stretchable region 80. This outer stretchable region 80 contracts in the width direction WD by means of the contraction of the outer elastic membrane 30 and can extend in the width direction WD (i.e., the stretchable direction ED becomes the width direction WD of the diaper). More specifically, with the outer elastic membrane 30 extended in the width direction WD, the first sheet 20A and the second sheet 20B are joined at intervals in the width direction WD and the vertical direction XD perpendicular to the width direction WD through the joining holes 31 of the outer elastic membrane 30 to form a plurality of sheet joints 40, thereby forming an elastic membrane stretchable structure 20X. Furthermore, in the outer stretchable region 80, the sheet joints 40 are arranged such that the outer elastic membrane 30 remains uninterrupted in the width direction WD and the first sheet 20A and the second sheet 20B contract by means of the contraction force of the outer elastic membrane 30 to form a shrinkage pleat 25, thereby giving such stretchability. Thus, when the outer portion 60 of the waist 23 and the outer stretchable area 80 of the waist adjacent portion 22 are structured to stretch and contract by means of the same outer elastic membrane 30, the waist 23 and the waist adjacent portion 22 have a uniform outer surface texture. Furthermore, as described later, even when a thin, elongated elastic member such as a rubber thread is used as the inner elastic member 62, it can be hidden by the outer portion 60, making it invisible or difficult to see from the outer surface.

[0142] In the lateral extension region 80 at at least one of the outer portion 60 of the waist 23 and the waist adjacent portion 22, it is possible to... Figure 7 and Figure 9 As shown in the example, a non-porous strip 32 with an outer elastic membrane 30 (i.e., the portion without the joint hole 31) that is linearly continuous along the width direction WD can also be as follows: Figure 11 The examples shown and Figure 15 The example shown does not have such a part.

[0143] In the outer stretchable region 80, in its natural length state, such as Figure 7 (d) Figure 9 (d) and Figure 14 As shown in (b), the first layer 20A and the second layer 20B between the sheet joints 40 bulge in a direction separating from each other, forming a shrinkage pleat 25 extending in the vertical direction XD. Even in the worn state where it has been stretched to a certain extent in the width direction WD, the shrinkage pleat 25 remains after being unfolded. Furthermore, if, as shown in the diagram, the first layer 20A and the second layer 20B are not bonded to the outer elastic membrane 30 at least between the first layer 20A and the second layer 20B in the sheet joints 40, then according to the envisioned worn state... Figure 7 (c) Figure 9 (c) and the unfolded state of the first layer 20A and the second layer 20B. Figure 7 (a) and (b) Figure 9 As can be seen from (a) and (b), in these states, a gap is formed between the joining hole 31 in the outer elastic membrane 30 and the sheet joint portion 40, and air permeability can be provided through this gap even if the material of the outer elastic membrane 30 is a non-porous membrane or sheet. In particular, when there is a non-porous strip 32 in which the outer elastic membrane 30 is linearly continuous along the width direction WD, the joining hole 31 is narrowed due to the further contraction of the outer elastic membrane 30 in its natural length state, thus forming a shape in which almost no gap is formed between the joining hole 31 and the sheet joint portion 40. In the case where there is no part in which the outer elastic membrane 30 is linearly continuous along the width direction WD, a gap remains between the joining hole 31 and the sheet joint portion 40.

[0144] Ideally, the maximum stretch of the outer stretchable region 80 in the width direction WD should be 190% or more (preferably 200-220%). The maximum stretch of the outer stretchable region 80 is almost entirely determined by the elongation rate of the outer elastic membrane 30 during manufacturing; however, it is reduced due to factors that hinder shrinkage in the width direction WD. This hindering effect is primarily due to the proportion of the length 40x of the sheet joint 40 per unit length in the width direction WD; the larger this proportion, the greater the reduction in maximum stretch. Typically, the length 40x of the sheet joint 40 is related to the area ratio of the sheet joint 40, therefore the maximum stretch of the outer stretchable region 80 can be adjusted by the area ratio of the sheet joint 40.

[0145] For the elongation stress in the outer expansion and contraction zone 80, as... Figure 7 and Figure 9 In the example shown, where the outer elastic membrane 30 is a straight, continuous, non-porous strip 32 along the width direction WD, it is possible to mainly pass through the outer elastic membrane 30 along the straight, continuous, non-porous strip 32 along the width direction WD (see reference). Figure 7 The adjustment is made by summing the vertical dimension 32w of (a) and (a) of 9 (equal to the spacing 31d of the mating hole). On the other hand, in such Figure 11 The examples shown and Figure 15 In the example shown, where there is no portion where the outer elastic membrane 30 is a straight line continuous along the width direction WD, the angle between the continuous direction of the unjointed strips 51 and 52 and the stretching direction ED can be adjusted. Normally, in the unfolded state, the acute-angled side intersection angles θ1 and θ2 between the continuous direction of the unjointed strips 51 and 52 and the stretching direction ED are greater than 0 degrees and less than 45 degrees, and are particularly preferably in the range of 10 to 30 degrees.

[0146] The area ratio of the sheet joint 40 in the outer telescopic region 80 and the area of ​​each sheet joint 40 can be appropriately determined, but in general, it is preferred to set them within the following range.

[0147] Area of ​​the joint 40: 0.14–3.5 mm 2 (A preferred size is 0.14–1.0 mm) 2 )

[0148] The area ratio of the sheet joint 40 is 1.8% to 19.1% (particularly preferred is 1.8% to 10.6%).

[0149] Thus, since the maximum extension and elongation stress of the outer expansion region 80 can be adjusted by the area of ​​the joint portion 40, therefore... Figure 1 and Figure 2As shown, multiple areas with different area ratios of the sheet joint 40 can be provided within the outer telescopic area 80, so that the fit can be varied according to the location.

[0150] The shapes of the joint portions 40 and the joint holes 31 in their natural length state can be appropriately determined, and can be any shape such as a perfect circle, ellipse, triangle, rectangle, rhombus, or a convex lens shape, concave lens shape, star shape, cloud shape, etc. The dimensions of each joint portion are not particularly limited. Regarding the maximum length 40y (approximately equal to the vertical dimension 31y of the joint hole 31), it is preferably 0.5 to 3.0 mm, particularly preferably 0.7 to 1.1 mm. Regarding the maximum width 40x, it is preferably 0.1 to 3.0 mm, especially in the case where the shape is longer along the direction XD perpendicular to the extension direction, it is preferably 0.1 to 1.1 mm.

[0151] The size of each joint 40 only needs to be appropriately determined. However, if it is too large, the hardness of the joint 40 will have a greater impact on the tactile feel. If it is too small, the joint area will be too small, and the materials will not be able to bond sufficiently. Therefore, under normal circumstances, the area of ​​each joint 40 is preferably about 0.14 to 3.5 mm. 2 Since the sheet joint portion is formed via the joining hole 31, the area of ​​the opening of each joining hole 31 only needs to be greater than or equal to the area of ​​the sheet joint portion, but preferably about 1 to 1.5 times the area of ​​the sheet joint portion. Furthermore, the area of ​​the opening of the joining hole 31 refers not to the outer elastic membrane 30 alone, but to its integrated state with the first layer 20A and the second sheet layer 20B, and is the value under its natural length. When the area of ​​the opening of the joining hole 31 is unequal on the front and back sides of the outer elastic membrane 30, or is uneven in the thickness direction, the area of ​​the opening of the joining hole 31 refers to the minimum value.

[0152] The planar arrangement of the plate joint 40 and the joint hole 31 in the outer telescopic region 80 can be suitably determined, but a regular, repetitive planar arrangement is preferred, except as shown below. Figure 10 The rhombic lattice pattern shown in (a) is as follows: Figure 10 The hexagonal lattice pattern shown in (b) (also called the interlaced pattern), as Figure 10 As shown in (c), a square lattice, such as Figure 10 The rectangular grid pattern shown in (d) is as follows: Figure 10 In addition to the regularly repeated shapes such as the parallel grid shown in (e) (as illustrated, multiple parallel columns in the inclined direction are arranged in two groups in an intersecting manner) (including shapes that are inclined at an angle of less than 90 degrees relative to the stretching direction), the shapes can also be formed by the regularly repeated groups of the sheet joint 40 (the arrangement of the groups can be regular, irregular, or patterns, characters, etc.).

[0153] The arrangement pattern of the sheet joints 40 in the outer telescopic region 80 is preferably as follows: Figure 9 The example shown Figure 11 The examples shown and Figure 15 The arrangement pattern shown is as follows. Specifically, in these examples, in the outer telescopic region 80, in the unfolded state, the unjointed strips 51 and 52, which are continuous as portions without the sheet joints 40, are repeatedly spaced apart along a first direction 51d that intersects the telescopic direction ED at an acute angle (acute angle θ1). Furthermore, a plurality of sheet joints 40 and joint holes 31 are provided spaced apart between adjacent first unjointed strips 51 in the outer telescopic region 80. Moreover, a unit structure comprising a plurality of first unjointed strips 51 with different first widths 51w repeatedly exists in the outer telescopic region 80 in a direction perpendicular to the first direction 51d, wherein the first width 51w is defined as the width in the direction perpendicular to the first direction 51d.

[0154] Thus, when multiple unit structures containing different first unjointed bands 51 of the first width 51w are repeatedly present in the outer stretching region 80 in a direction perpendicular to the first direction 51d, the continuous portions of the outer elastic membrane 30 inside the first unjointed band 51 also exhibit the same width variation in size relationship. That is, if the width 51w of the first unjointed band 51 is narrow, the width of the continuous portion of the inner outer elastic membrane 30 also becomes narrow; if the width 51w of the first unjointed band 51 is wide, the width of the continuous portion of the inner outer elastic membrane 30 also becomes wide. Moreover, if there is a variation in the first width 51w in the continuous portions of the outer elastic membrane 30 within the first unjointed band 51, both the wider and narrower continuous portions of the outer elastic membrane 30 within the first unjointed band 51 are visually emphasized. As a result, regardless of whether the outer stretching region 80 is in its natural length state (see reference...), the width of the continuous portions of the outer elastic membrane 30 within the first unjointed band 51 is also varied. Figure 13 and Figure 17 Whether the garment is stretched to a certain extent or not, it will still present a beautiful diagonal stripe pattern. Furthermore, when the garment is stretched to a certain extent, the size of the shrinkage pleat 25 at the first unjointed band 51 changes correspondingly to the first width 51w of the first unjointed band 51, thus making the diagonal stripe pattern appear more clearly due to the effect of the shrinkage pleat 25.

[0155] The aforementioned unit structure is not limited by the size of the first unjointed bands 51 as long as it includes multiple first unjointed bands 51 with different first widths 51w. However, when the first width 51w of the first unjointed band 51 is larger than the first unjointed band 51 with the closest width 51w, it is preferable that the former is 1.2 to 60 times the latter. When the first width 51w of the first unjointed band 51 is smaller than the first unjointed band 51 with the closest width 51w, it is preferable that the former is 0.01 to 0.8 times the latter.

[0156] Furthermore, as long as the aforementioned unit structure contains a plurality of first unjointed bands 51 with different first widths 51w, the first widths 51w of all the first unjointed bands 51 can be different, or as shown in the figure, the first widths 51w of a portion of the plurality of first unjointed bands 51 can be different from the first widths 51w of the other single or plurality of first unjointed bands 51.

[0157] Even if a diagonal stripe pattern formed along the first direction 51d based on the contraction fold 25 of the first unjointed band 51 and the continuous portion of the outer elastic membrane 30 inside it appears in the outer stretching region 80, the diagonal stripe pattern formed along the contraction fold 25 of the first unjointed band 51 and the continuous portion of the outer elastic membrane 30 inside it may become less noticeable when diagonal stripe patterns along other inclined directions are more strongly seen in the same outer stretching region 80. Conversely, if the maximum value of the first width 51w of the first unjointed band 51 becomes the maximum value of the width of all unjointed bands 51, 52 with different and the same inclined directions in the direction perpendicular to the continuous direction, then the diagonal stripe pattern formed by the contraction fold 25 of the first unjointed band 51 and the continuous portion of the outer elastic membrane 30 inside it will be more strongly seen in the outer stretching region 80, which is therefore preferred. The maximum value of the first width 51w of the first unjointed strip 51 in this case can be appropriately determined, but it is preferably 0.01 to 9 times the width 51w of the first unjointed strip 51 closest to it. Furthermore, the width of all unjointed strips 51 and 52, including the first unjointed strip 51, in the direction perpendicular to the continuous direction is not limited, but generally, it is preferably in the range of 0.3 to 50 mm. Of course, regarding the width of the unjointed strips 51 and 52 in the direction perpendicular to the continuous direction, for the first unjointed strip 51, it is the first width 51w, and since it is a straight, continuous portion, it is of equal width.

[0158] The first interval 51s, which is the distance between adjacent first unjointed bands 51 in a direction perpendicular to the first direction 51d, can be appropriately determined. Therefore, this first interval 51s can be the same as, larger than, or smaller than the first width 51w of the adjacent first unjointed bands 51. As a preferred example, a configuration in which the maximum value of the first width 51w of the first unjointed bands 51 in the unit structure is smaller than the maximum value of the first interval 51s can be described. In this way, by forming a large interval portion in the unit structure, the diagonal stripe pattern formed based on the contraction folds 25 of the first unjointed bands 51 and the continuous portion of the outer elastic membrane 30 inside them is more strongly seen. The maximum value of the first width 51w of the first unjointed bands 51 in this case can be appropriately determined, but is preferably 0.01 to 9 times the maximum value of the first interval 51s. Furthermore, the spacing between all unjoined strips 51 and 52, including the first unjoined strip 51, in the direction perpendicular to the continuous direction is not particularly limited, but is generally preferred to be in the range of 0.3 to 50 mm. Of course, the spacing between the unjoined strips 51 and 52 in the direction perpendicular to the continuous direction is the first interval 51s for the first unjoined strip 51, and is equal in the continuous direction.

[0159] As unjointed zones 51 and 52, a second unjointed zone 52 may be a straight continuous second direction 52d that intersects the telescopic direction ED at an acute angle (acute angle θ2) in a direction perpendicular to the second direction 52d, other than the first direction 51d, and may be absent altogether. In a preferred example with the second unjointed zone 52, the unjointed zones 51 and 52 are formed in a diagonal lattice pattern in the outer telescopic region 80. The first unjointed zone 51 is a continuous portion of the diagonal lattice unjointed zones 51 and 52 in one direction, and the second unjointed zone 52 is a continuous portion of the diagonal lattice unjointed zones 51 and 52 in another direction. In this case, the inclinations of the first direction 51d and the second direction 52d relative to the telescopic direction ED are opposite in sign. Furthermore, as... Figure 11 The examples shown and Figure 15 As shown in the example, even if it does not have a continuous unjointed strip 51, 52 in the width direction WD (telescopic direction ED), by making the acute-angle side intersection angles θ1 and θ2 of the first direction 51d and the second direction 52d relative to the telescopic direction ED 5 to 45 degrees, particularly preferably 10 to 30 degrees, when the outer telescopic region 80 is in the unfolded state, the telescopicity of the outer telescopic region 80 can be sufficiently ensured.

[0160] However, if the diagonal stripe pattern along the inclined direction of the second unjointed band 52 is seen more strongly in the same outer stretching region 80, the diagonal stripe pattern formed based on the contraction fold 25 of the first unjointed band 51 and the continuity of the outer elastic membrane 30 inside it may become less noticeable. Therefore, it is desirable that, in such... Figure 15 In the example shown, where a second unjointed band 52 is present, the second width 52w of the second unjointed band 52 is determined to be the same in all directions perpendicular to the second direction, or the sheet joint 40 is configured without a second unjointed band 52. As a result, the diagonal stripe pattern formed by the contraction folds 25 of the first unjointed band 51 and the continuity of the outer elastic membrane 30 within them is more strongly visible within the outer stretching region 80.

[0161] On the other hand, the sheet joints 40 are arranged in the first direction 51d between adjacent first unjoined strips 51, for example, as shown in the example. Figure 16 As shown, if all the joint portions 40 are formed into an elongated shape such that the acute angle θ3 between the long side direction and the direction perpendicular to the stretching direction ED is within 10 degrees, and the maximum dimension 40e in the stretching direction ED is 0.1 to 0.4 mm, then the dimension of the first unjointed strip 51 in the stretching direction ED can be better ensured, thereby suppressing the reduction of stretchability, which is therefore preferred.

[0162] In addition, such as Figure 11 As shown in the example, in the unit structure, there are a plurality of wide first unjointed strips 51 with the largest first width 51w and a plurality of narrow first unjointed strips 51 with a first width 51w that are narrower than the first width 51w, which are adjacent to each other in the direction perpendicular to the first direction 51d. In this case, it is preferable that between the adjacent wide first unjointed strips 51, there are elongated sheet joints 40 arranged at intervals in the first direction 51d, which are such that the acute angle between the long side direction and the second direction 52d is within 5 degrees, and the maximum size 40f in the direction perpendicular to the long side direction is 0.1 to 0.4 mm. Furthermore, preferably, between adjacent narrow first unjointed strips 51, elongated sheet joints 40 are arranged at intervals along the first direction 51d, such that the acute angle θ3 between the long side direction and the first direction 51d is 45 degrees or more, and the maximum dimension 40g in the direction perpendicular to the long side direction is 0.1 to 0.4 mm. This shape and arrangement of the sheet joints 40 visually emphasizes the contraction folds 25 of the first unjointed strips 51 and the continuity of the outer elastic membrane 30 within them, with a smaller area of ​​sheet joints 40.

[0163] The columns of the sheet joints 40 located between adjacent unjointed strips 51 and 52 (columns in the continuous direction of the unjointed strips 51 and 52) can be one column or multiple columns. Furthermore, the spacing of the sheet joints 40 in the column direction is preferably regular, but it is not necessary to make all the spacings fixed; some of the spacings can be different.

[0164] (Non-expandable area)

[0165] like Figure 2 As shown, a non-stretchable region 70 can be provided in the outer stretchable region 80. The non-stretchable region 70 refers to a region where the maximum stretch in the stretching direction is 120% or less. The maximum stretch of the non-stretchable region 70 is preferably 110% or less, more preferably 100%. The configuration of the outer stretchable region 80 and the non-stretchable region 70 can be appropriately determined. In the case of the outer body 20 of the shorts-type disposable diaper, since the portion overlapping with the absorbent body 13 is an area that does not require stretching, it is preferable, as shown in the example, that a non-stretchable region is not provided in the outer stretchable region 80 of the waist, but rather a portion or all of the portion overlapping with the absorbent body 13 in the waist adjacent portion (ideally including almost the entire inner and outer fixing region 10B) is designated as the non-stretchable region 70. That is, the outer stretchable region 80 of the waist 23 is continuous throughout the entire width direction WD of the waist 23 (except for the side seal 21), but a portion of the waist adjacent portion 22 becomes the non-stretchable region 70. Of course, a non-stretchable region 70 can be set from the area overlapping with the absorber 13 all the way to the area that does not overlap with the absorber 13 in its width direction WD or front-back direction LD, or a non-stretchable region 70 can be set only in the area that does not overlap with the absorber 13.

[0166] The shape of each piece joint 40 in the non-telescopic region 70 is not particularly limited, and can be appropriately selected from the aforementioned shapes.

[0167] Furthermore, the area ratio of the sheet joint 40 in the non-stretchable region 70 and the area of ​​each sheet joint 40 can be appropriately determined. However, under normal circumstances, if it is set within the following range, the area of ​​each sheet joint 40 is small and the area ratio of the sheet joint 40 is low. As a result, the non-stretchable region 70 will not become hard, which is preferred.

[0168] Area of ​​the joint 40: 0.10~0.75mm 2 (especially 0.10~0.35mm) 2 )

[0169] Area ratio of the joint 40: 4–13% (especially 5–10%)

[0170] The non-stretchable region 70 can be formed by densely arranging the sheet joints 40 to prevent the first sheet 20A and the second sheet 20B from shrinking due to the contractile force of the outer elastic membrane 30, thus preventing folds from forming. Specific examples of methods for forming the non-stretchable region 70 include those shown in Japanese Patent Nos. 5980355, 5918877, 5980367, and 6049228.

[0171] (Inner part)

[0172] like Figure 4 and Figure 19 As shown in the example, the waist 23 has an inner portion 61 that overlaps with and joins the inner side of the outer portion 60. It is desirable that the inner portion 61 extends across the entire width direction WD of the waist 23, but it may also be provided only for a portion of the width direction WD. The dimension of the inner portion 61 in the front-rear direction LD is equal to the dimension of the waist 23 in the front-rear direction LD.

[0173] (Inner expansion / contraction area)

[0174] also, Figure 19 The inner portion 61 of the example shown includes a third layer 20C made of nonwoven fabric, a fourth layer 20D made of nonwoven fabric, and an inner elastic member 62 between the third layer 20C and the fourth layer 20D. It also has an inner stretchable region 63 that contracts in the width direction WD by means of the contraction of the inner elastic member 62 and can stretch in the width direction WD. Ideally, the inner stretchable region 63 should extend throughout the entire width direction WD of the waist portion 23, but it can also be provided only in a portion of the width direction WD. Thus, when the outer elastic membrane 30 is present not only in the outer portion 60 of the waist portion 23 but also in the inner portion 61 of the waist portion 23, the elastic members of the waist portion 23 (outer elastic membrane 30, inner elastic member 62) become double-layered, making it easy to ensure that the fastening force of the waist portion 23 is stronger than that of the waist adjacent portion 22.

[0175] As an inner elastic component 62, such as Figure 19 As shown in the example, elongated elastic components such as rubber threads can be appropriately used. For example, spandex rubber threads with a thickness of approximately 310 to 940 dtex can be used as elongated elastic components. Furthermore, when using elongated elastic components, it is preferable to arrange multiple (e.g., approximately 3 to 5) threads at intervals (e.g., approximately 5 to 9 mm) along the front-to-back direction LD. As described later, as the inner elastic component 62, such as... Figure 23As shown, an elastic membrane can also be used, but in this case, the air permeability of the inner portion 61 in the thickness direction must be reduced, thereby also inhibiting the improvement of air permeability by the air permeability channel 69 described later. Therefore, as the inner elastic member 62, such as Figure 19 As shown, it is preferable to arrange multiple slender elastic components at intervals.

[0176] As an inner elastic component 62, such as Figure 23 As shown, an elastic membrane can also be used. In this case, the inner elastic member (inner elastic membrane) 62 can be the same member as the outer elastic membrane 30. Both can be a single membrane folded back at the edge of the waist 23, or they can be different membranes discontinuous at the edge of the waist 23. Furthermore, in this case, the bonding structure of the third and fourth layers 20D in the inner portion 61 is preferably the same as the bonding structure of the first and second layers 20B in the outer portion 60 (i.e., the third layer 20C and the fourth layer 20D are fused together through the bonding hole 31 of the inner elastic member (inner elastic membrane) 62), but different structures are also possible.

[0177] The third layer 20C and the fourth layer 20D can be as follows: Figure 19 As shown, these are two different nonwoven fabrics, or they can be like... Figure 24 The example shown uses the crease in a folded piece of nonwoven fabric as the boundary between the portion on one side and the portion on the other side. Furthermore, as... Figure 19 As shown, the third layer 20C of the inner portion 61 and the second layer 20B of the outer portion 60 can also be portions located on one side and the other side, with the crease in a folded nonwoven fabric as the boundary. Meanwhile, or differently, as... Figure 19 As shown, the fourth layer 20D of the inner portion 61 and the first layer 20A of the outer portion 60 can also be a portion located on one side and a portion on the other side, with the crease in a folded nonwoven fabric as the boundary.

[0178] In addition, such as Figure 22 As shown in the example, when the inner elastic member 62 is an elongated elastic member, the third layer 20C is shared with the second layer 20B, the inner elastic member 62 is adjacent to the inner surface of the outer portion 60, and the inner elastic member 62 is located between the second layer 20B and the fourth layer 20D (covering layer), the number of layers in the inner portion 61 is reduced, and the air permeability of the waist 23 in the thickness direction is improved, which is therefore preferred.

[0179] In addition to being continuously joined in the front-to-back direction LD and the width direction WD, the third layer 20C and the fourth layer 20D can also be joined intermittently in at least one direction. Furthermore, the inner elastic member 62 can be provided at both ends of the inner elastic member 62 relative to the fixing portions of the third layer 20C and the fourth layer 20D in at least the width direction WD, but it can also be provided intermittently in the width direction WD, or it can be provided throughout the entire width direction WD of the inner elastic member 62. In particular, in the example shown, where the inner elastic member 62 is an elongated elastic member, by fixing the elongated elastic member to the third layer 20C and the fourth layer 20D via a hot-melt adhesive 62h provided only at the passage position of the elongated elastic member, it can serve as both a fixing of the elongated elastic member and a joining of the third layer 20C and the fourth layer 20D.

[0180] When the maximum extension of the inner telescopic region 63 in the width direction WD is equal to the maximum extension of the outer telescopic region 80 in the width direction WD, the structural components of the outer portion 60 and the inner portion 61 have equal dimensions in the width direction WD, making manufacturing easier, which is therefore preferred. However, the maximum extension of the inner telescopic region 63 in the width direction WD can also be set to 0.3 to 1.0 times the maximum extension of the outer telescopic region 80 in the width direction WD. When the inner elastic member 62 is an elongated elastic member, the maximum extension of the inner telescopic region 63 in the width direction WD can be adjusted by the elongation rate of the inner elastic member 62 during manufacturing. When the inner elastic member 62 is an elastic membrane, similar to the case of the outer telescopic region 80, the maximum extension of the inner telescopic region 63 in the width direction WD can be adjusted by the elongation rate of the outer elastic membrane 30 during manufacturing and the degree to which the main factors hindering contraction in the width direction WD (such as the length of the sheet joint 40) are considered.

[0181] (The stripes on the outer and inner sides join together)

[0182] like Figure 19 and Figure 20 As shown, the outer portion 60 and the inner portion 61 are joined by a stripe pattern formed by alternating inner and outer joints 64 continuous in the front-rear direction LD and inner and outer non-joints 65 continuous in the front-rear direction LD in the width direction WD. This joining can be performed not only by hot melt adhesive as shown in the example, but also by welding such as ultrasonic welding.

[0183] The dimension of the inner and outer joint 64 in the width direction WD can be appropriately determined, but is preferably about 5 to 10 mm. The dimension of the inner and outer joint 64 in the front-rear direction LD can be set to about 0.9 to 1 times the dimension of the inner portion 61 in the front-rear direction LD. Multiple inner and outer joints 64 can also be provided intermittently in the front-rear direction LD (spaced apart along the front-rear direction LD at various positions in the width direction WD). The dimension of the inner and outer non-jointing portions 65 in the width direction WD (the interval between the inner and outer joints 64 in the width direction WD) can be appropriately determined, but is preferably about 10 to 20 mm.

[0184] (The relationship between the natural lengths of the outer and inner portions)

[0185] The characteristic is that the natural length of the outer portion 60 in the width direction WD is 1.1 to 1.8 times, more preferably 1.3 to 1.6 times, the natural length of the inner portion 61 in the width direction WD. Here, the natural lengths of the outer portion 60 and the inner portion 61 in the width direction WD are measured under conditions where the outer portion 60 and the inner portion 61 are peeled off and separated (cut off as needed).

[0186] Thus, when the outer portion 60 and the inner portion 61 are joined with a striped pattern and the natural length of the outer portion 60 in the width direction WD is 1.1 to 1.8 times the natural length of the inner portion 61 in the width direction WD, in a wearing state that includes the natural length but has been somewhat contracted internally, such as... Figure 20 As shown in the schematic diagram, at the non-jointed inner and outer portions 65, the outer portion 60 rises from the inner portion 61, forming a continuous air-permeable channel 69 in the front-to-back direction LD between the outer portion 60 and the inner portion 61. Therefore, due to the presence of this air-permeable channel 69, the air permeability of the waist portion 23 is improved compared to a structure that only doubles the structure of the waist portion 23.

[0187] When the maximum extension of the outer portion 60 in the width direction WD is equal to the maximum extension of the inner portion 61 in the width direction WD, by contracting the inner portion 61 compared to the outer portion 60, the natural length of the outer portion 60 in the width direction WD can be made longer than the natural length of the inner portion 61 in the width direction WD. In the case where the outer portion 60 has a stretchable structure formed by an elastic membrane, the natural length in the width direction WD can be adjusted by the area ratio of the sheet joint 40.

[0188] The area ratio of the sheet-joint portion 40 of the outer portion 60 can be the same in both the inner and outer non-joint portions 65 and the inner and outer joint portions 64. However, even if the natural length in the width direction WD of the outer portion 60 as a whole is the same, when the area ratio of the sheet-joint portion 40 of the outer portion 60 in the inner and outer non-joint portions 65 is larger than that in the inner and outer joint portions 64, the natural length of the outer portion 60 in the width direction WD is longer at the inner and outer non-joint portions 65 compared to the case where their area ratios are equal. That is, at the inner and outer non-joint portions 65, the outer portion 60 tends to rise higher from the inner portion 61.

[0189] On the other hand, when the outer portion 60 and the inner portion 61 have a folding member that folds back from the outer portion 60 at the edge of the waist 23 to the inner portion 61, a simple manufacturing method can be adopted during manufacturing, in which the outer portion 60 and the inner portion 61 are integrally formed in a flat state, and then folded back at the boundary of the two portions to join them together. Therefore, this is preferred. For example, in Figure 19 In the examples shown, the nonwoven fabric forming the first layer 20A and the fourth layer 20D (the first nonwoven fabric) and the nonwoven fabric forming the second layer 20B and the third layer 20C (the second nonwoven fabric) are the folding components mentioned here. Figure 23 In the example shown, not only the nonwoven fabrics but also the elastic membrane are referred to here as the folding member. However, in this case, one end of the aforementioned air-permeable channel 69 formed between the outer portion 60 and the inner portion 61 in the wearing state is blocked by the folding member. Although the folding member has air permeability in the thickness direction, the improvement of air permeability is suppressed. In particular, when the folding member includes an elastic membrane, even if the elastic membrane has air permeability in the thickness direction by means of the joining hole 31, the reduction of air permeability through the air permeable hole is unavoidable.

[0190] Therefore, as Figure 21 As shown, preferably, a ventilation hole 66 penetrating the folding member in the thickness direction is formed at the intersection of the crease of the folding member and the inner and outer non-jointing portions 65. Thus, the aforementioned ventilation channel 69 formed between the outer portion 60 and the inner portion 61 in the wearing state communicates with the outside via the ventilation hole 66 formed at the waist edge of the folding member, resulting in particularly excellent breathability. Furthermore, the ventilation hole 66 refers to a hole formed by mechanical processing such as needle punching or die cutting, excluding the gaps between adjacent fibers inherent in the nonwoven fabric, or a hole with a diameter larger than such gaps between adjacent fibers.

[0191] In addition, such as Figure 19As shown, the folding component preferably does not include an elastic membrane that folds back from the outer portion 60 at the edge of the waist 23 to the inner portion 61. Thus, the folding location does not contain an elastic membrane, thereby preventing one end of the aforementioned ventilation channel 69 from being blocked by the elastic membrane, which is therefore preferable. For the same reason, the folding component preferably does not have a hot-melt adhesive at the folding location. To allow one end of the ventilation channel 69 to open at the edge of the waist, as... Figure 24 As shown in the example, it can also be configured without a folding component.

[0192] In addition, such as Figure 23 As shown in the example, when the folding member has a first nonwoven fabric, a second nonwoven fabric, and an elastic membrane sandwiched between them throughout the outer portion 60 and the inner portion 61, and the first and second nonwoven fabrics are laminated together by being fused through a joint hole 31 through the elastic membrane at the spaced-apart joints 40, it is preferable to manufacture it by a simple method such that not only the outer portion 60 of the waist abutment portion 22 and the waist portion 23, but also the inner portion 61 of the waist portion 23 are formed as a single laminate in a flat state, and then the inner portion 61 is folded back to the inside of the outer portion 60 to join them. However, in this case, when the joint 40 is provided at the fold of the folding member, the skin feel at the edge of the waist portion 23 becomes hard, which is not preferable. In addition, the folding member is prone to bending along the edge of the joint 40, so the folded position is difficult to stabilize.

[0193] Therefore, in this case, such as Figure 23 As shown in the example, no sheet joint 40 is provided at the crease of the folding member, and the spacing of the sheet joints 40a adjacent to the outer and inner sides of the crease of the folding member in the width direction WD is preferably narrower than the spacing of other sheet joints 40 in the width direction WD. In this case, since there is no sheet joint 40 at the crease, the skin feel of the edge of the waist 23 will not become hard, and the folding position of the folding member (indicated by a single-dotted line in the figure) is stable.

[0194] <Explanation of terms used in the instruction manual>

[0195] Unless otherwise specified in the instruction manual, the following terms in the instruction manual shall have the following meanings.

[0196] • The “front portion” and “back portion” refer to the portions located on the front and back sides, respectively, with the center of the shorts-type disposable diaper in the front-back direction as the boundary. In addition, the crotch portion refers to the front-back direction range including the center of the shorts-type disposable diaper in the front-back direction, and in the case where the absorbent body has a narrowing portion, it refers to the front-back direction range of the portion having the narrowing portion.

[0197] • "Maximum stretch" refers to the maximum stretch in the stretch direction ED (in other words, the stretch in the unfolded state without contraction (including all contractions such as contraction of elastic components) and relaxed and flat). It is expressed as a percentage of the length in the unfolded state when the natural length is set to 100%.

[0198] • “Area ratio” refers to the proportion of an object portion in a unit area. It is a percentage expressed by dividing the total area of ​​object portions (e.g., the joint portion 40, the opening of the joint hole 31, and the vent hole) in the object region (e.g., the outer telescopic region 80 and the non-telescopic region 70) by the area of ​​the object region. In particular, the “area ratio” in a region with a telescopic structure refers to the area ratio in the unfolded state. In a method where multiple object portions are arranged at intervals, it is desirable to set the object region to contain more than 10 object portions and calculate the area ratio.

[0199] • "Elongation" refers to the value when the natural length is 100%. For example, an elongation of 200% means the same as an elongation ratio of 2.

[0200] • The weight per unit area is measured as follows: After pre-drying, the sample or test piece is placed in a test chamber or apparatus under standard conditions (temperature 23±1℃, relative humidity 50±2%) to achieve a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight state in an environment with a temperature of 100℃. Alternatively, for fibers with a standard moisture regain of 0.0%, pre-drying may not be necessary. Using a template (100mm×100mm) for sample selection, cut 100mm×100mm samples from the constant-weight test piece. Measure the weight of the sample, and calculate the weight per square meter as the weight per unit area, multiplied by 100.

[0201] • The “thickness” of the absorber is measured using a thickness gauge (PEACOCK, large type, dial thickness gauge, model JB (measuring range 0-35mm) or model K-4 (measuring range 0-50mm)) manufactured by Ozaki Manufacturing Co., Ltd., with the sample and the thickness gauge level.

[0202] • Thickness other than that mentioned above is measured using an automatic thickness gauge (KES-G5 portable compression measurement program) under a load of 0.098 N / cm. 2 The pressure area is 2cm² 2 It is automatically measured under certain conditions.

[0203] • "Tensive strength" and "tensile elongation (elongation at break)" refer to the values ​​measured according to JIS K7127:1999 "Plastics - Test methods for tensile properties," with an initial clamping interval (scale distance) of 50 mm and a tensile speed of 300 mm / min, except that the test piece is set to a rectangular shape with a width of 35 mm and a length of 80 mm. For example, the AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile testing machine.

[0204] • "Elongation stress" refers to the tensile stress (N / 35mm) measured during elongation within the elastic region in a tensile test conducted according to JIS K7127:1999 "Plastics - Test methods for tensile properties -", ​​with an initial clamping interval (scale distance) of 50mm and a tensile speed of 300mm / min. The degree of elongation can be appropriately determined based on the test object. Regarding the test piece, a rectangular shape with a width of 35mm and a length of 80mm or more is preferred. However, if a test piece with a width of 35mm cannot be cut, a test piece of the width that can be cut should be made, and the measured value should be converted to the value for a width of 35mm. Furthermore, even if the target area is small and sufficient test pieces cannot be obtained, if the magnitude of the elongation stress is to be compared, a comparison can at least be made by appropriately using test pieces that are small but of the same size. For example, the AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile testing machine.

[0205] • "Unfolded state" refers to a state in which there is no contraction (including all contractions such as the contraction of elastic components) and the surface is relaxed and flat.

[0206] Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0207] • Unless otherwise specified, the test or measurement was conducted in a laboratory or apparatus under standard conditions (temperature 23±1℃ and relative humidity 50±2%).

[0208] Industrial availability

[0209] As long as the present invention has a stretchable component that uses an elastic membrane for elastic stretching, it can be used in all disposable clothing items, except for shorts-type disposable diapers like those mentioned above, such as belt-type disposable diapers, disposable clothing for swimming or water play.

[0210] Label Explanation

[0211] 10: Inner body; 10B: Inner and outer fixing areas; 11: Top sheet; 12: Liquid-impermeable sheet; 13: Absorbent; 13N: Narrowing portion; 14: Packaging sheet; 17: Side without absorbent; 20: Outer body; 20A: First sheet layer; 20B: Second sheet layer; 20C: Third sheet layer; 20D: Fourth sheet layer; 20X: Elastic membrane stretching structure; 21: Side seal; 22: Waist adjacent portion; 23: Waist; 25: Shrink pleat; 30: Outer elastic membrane; 31: Joint hole; 32: Non-perforated strip; 40, 40a: Sheet joint portion; 51, 52: Non-jointed strip; 51: First non-jointed strip; 51d: First direction; 51s: First interval; 51 w: 1st width; 52: 2nd unjointed band; 52d: 2nd direction; 60: outer part; 61: inner part; 62: inner elastic component; 62h: hot melt adhesive; 63: inner stretching area; 64: inner and outer joint; 65: inner and outer non-jointed part; 66: vent hole; 69: vent channel; 70: non-stretching area; 80: outer stretching area; 90: three-dimensional pleat; 93: folded part; 94: free part; 95: pleated piece; 96: pleated elastic component; B: back part; ED: stretching direction; F: front part; L: middle part; LD: front and back direction; T: waist part; WD: width direction; XD: vertical direction.

Claims

1. A disposable wearing article characterized by comprising: the disposable wearing article has: a waist portion having an outer side portion with an outward surface exposed and an inner side portion overlapping with the inner side thereof; and a waist adjoining portion continuously from the outer side portion of the waist portion to a crotch side, the disposable wearing article has an outer side stretchable region throughout the outer side portion of the waist portion and the outer side of the waist adjoining portion, and an inner side stretchable region provided to the inner side portion of the waist portion, the outer side stretchable region has: a first sheet layer composed of a nonwoven fabric; a second sheet layer composed of a nonwoven fabric; and an elastic film interposed between the first sheet layer and the second sheet layer and throughout the outer side portion of the waist portion and the outer side of the waist adjoining portion, the first sheet layer and the second sheet layer are fused at sheet joint portions arranged at intervals in the front-and-rear direction through joint holes penetrating the elastic film, the outer side stretchable region is contracted in the widthwise direction by contraction of the elastic film and is stretchable in the widthwise direction, the inner side stretchable region includes: a third sheet layer composed of a nonwoven fabric; a fourth sheet layer composed of a nonwoven fabric; and an inner side elastic member interposed between the third sheet layer and the fourth sheet layer, the inner side stretchable region is contracted in the widthwise direction by contraction of the inner side elastic member and is stretchable in the widthwise direction, the outer side portion and the inner side portion are joined in a stripe pattern in which inner-and-outer joint portions continuously in the front-and-rear direction and inner-and-outer non-joint portions continuously in the front-and-rear direction are alternately repeated in the widthwise direction, a natural length in the widthwise direction of the outer side portion having the first sheet layer, the second sheet layer, and the elastic film interposed between the first sheet layer and the second sheet layer is 1.1 to 1.8 times a natural length in the widthwise direction of the inner side portion having the third sheet layer, the fourth sheet layer, and the inner side elastic member interposed between the third sheet layer and the fourth sheet layer.

2. The disposable wearing article according to claim 1, wherein the disposable wearing article has a turn-back member turned back at an edge of the waist portion from the outer side portion to the inner side portion, a through-air hole penetrating the turn-back member in the thickness direction is formed in a portion in which a crease of the turn-back member crosses the inner-and-outer non-joint portion.

3. The disposable wearing article according to claim 1 or 2, wherein the disposable wearing article has a turn-back member turned back at an edge of the waist portion from the outer side portion to the inner side portion, the turn-back member does not include an elastic film turned back at an edge of the waist portion from the outer side portion to the inner side portion.

4. The disposable wearing article according to claim 1 or 2, wherein the inner side elastic member is an elongated elastic member provided at intervals in the front-and-rear direction and continuously in the widthwise direction.

5. The disposable wearing article according to claim 1 or 2, wherein the disposable wearing article has a turn-back member turned back at an edge of the waist portion from the outer side portion to the inner side portion, The return member has a first nonwoven fabric, a second nonwoven fabric, and an elastic film interposed therebetween throughout the outer side portion and the inner side portion, and the first nonwoven fabric and the second nonwoven fabric are a laminate in which the first nonwoven fabric and the second nonwoven fabric are fused at sheet joint portions arranged at a spaced interval via joint holes that penetrate the elastic film, a portion of the first nonwoven fabric, a portion of the second nonwoven fabric, and a portion of the elastic film in the outer side portion constitute the first sheet layer, the second sheet layer, and the outer side elastic film, respectively, a portion of the elastic film in the inner side portion constitutes the inner side elastic member, the sheet joint portions adjacent to the outer side and the inner side of the fold of the return member are arranged at a narrower interval in the width direction than the sheet joint portions other than the sheet joint portions.

6. The disposable wearing article according to claim 1 or 2, wherein the maximum stretch of the outer side portion in the width direction is equal to the maximum stretch of the inner side portion in the width direction, the area ratio of the sheet joint portions of the outer side portion in the inner-outer non-joint portions is greater than the area ratio of the sheet joint portions of the outer side portion in the inner-outer joint portions.

7. The disposable wearing article according to claim 1 or 2, wherein the disposable wearing article is a pant-type disposable wearing article that has an outer cover that is one body from a front body portion to a back body portion or outer covers that are provided to the front body portion and the back body portion, respectively, an inner cover that is attached to the width direction middle portion of the outer cover and that extends to both sides of the crotch portion, side seal portions that are formed by joining both side portions of the outer cover at the front body portion and both side portions of the outer cover at the back body portion, respectively, and a waist opening and a pair of leg openings, the outer cover has the waist portion and the waist adjoining portion.

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