Stretchable sheet structure and disposable absorbent article

Abstract

Provided is a pleat sheet including a stretchable sheet structure which is stretched in a stretching direction by applying a stretching force and which contracts when the stretching force is released, the pleat sheet including the stretchable sheet structure being provided with: an inner side; an outer sheet; and a first elastic member, a second elastic member, and a third elastic member located between the inner sheet and the outer sheet and extending in the stretching direction. The inner sheet and the outer sheet are joined by a plurality of linear joining units arranged in the stretching direction. The joining width of the linear joining units at the intersecting positions of the linear joining units and the first to third elastic members is greater than the joining width of the linear joining units at the intersecting positions adjacent to each other. And an elastic sheet structure which is stretched in the stretching direction by applying a stretching force and contracts when the stretching force is released, and the pleats are in contact with the groin part of the wearer.

Description

Technical Field

[0001] The utility model relates to a stretchable stretch sheet structure and a disposable absorbent article comprising the stretch sheet structure.

[0002] [Reference to related applications]

[0003] This application claims the benefit of priority based on Japanese invention patent application No. JP2022-049269 filed on March 25, 2022, and Japanese invention patent application No. JP2022-071690 filed on April 25, 2022, the disclosures of which are hereby incorporated by reference in their entirety. Background Art

[0004] Conventionally, disposable absorbent articles that collect waste from the wearer have been equipped with gathers, including stretch sheet structures, at various locations. For example, disposable diapers have gathers at areas that contact the groin, the legs, and the waist. Furthermore, auxiliary absorbent articles placed inside diapers also have gathers to prevent leakage.

[0005] As such gathers, gathers having regularly arranged pleats are known. For example, Japanese Utility Model Application Laid-Open No. 4-71922 (Document 1) discloses a technique for forming gathers of a waist flap by placing stretchable elastic members between nonwoven fabric sheets coated with a hot-melt adhesive in linear, regularly spaced stripes, intersecting the hot-melt lines.

[0006] Furthermore, Japanese Patent Application Publication No. 2005-212405 (Document 2) discloses a technique in which two sheets are intermittently heat-fused in the expansion and contraction direction and in a direction orthogonal thereto, thereby securing elastic members oriented in the expansion and contraction direction by welding. International Publication No. 2018 / 070158 (Document 3) discloses a technique in which a pair of sheets are joined by welding, and a plurality of elastic members are held between the sheets.

[0007] However, when the elastic member is fixed with a hot-melt adhesive applied linearly perpendicular to the elastic member, as in Document 1, a large amount of hot-melt adhesive is required to properly adhere the elastic member. As a result, the shape-maintaining property of the pleats (hereinafter referred to as "rigidity") increases, and the pleats feel uncomfortable against the skin. When the sheet and the elastic member are joined by two-dimensionally intermittently arranged points of the same shape, as in Document 2, the point width in the stretching direction must be increased to maintain the joining strength, resulting in a decrease in the area of ​​the sheet surface used as pleats. In Document 3, the elastic member is firmly clamped in a fixed position during welding, but there is a possibility that the strength of the sheet will be weakened at the fixed position of the elastic member.

[0008] On the other hand, in Documents 1 to 3, since the pleats of the gathers are formed perpendicularly to the direction in which the gathers are stretched, the stiffness of the gathers in maintaining their shape relative to the direction in which the pleats are stretched increases. As a result, for example, in the case of gathers that contact the groin, the gathers may contact the groin too strongly, or in the case of gathers at the waist, the gathers may be strongly caught on the skin surface when the diaper is worn. Utility Model Content

[0009] An object of the present invention is to provide a stretch sheet structure having gathers arranged neatly and having appropriate rigidity, and a disposable absorbent article having the stretch sheet structure.

[0010] The stretch sheet structure of embodiment 1 of the present invention is stretched in a stretching direction by the application of a stretching force and contracts when the stretching force is released, and comprises: a first sheet; a second sheet overlapping the first sheet; a linear first elastic member located between the first sheet and the second sheet and extending in the stretching direction; a linear second elastic member located between the first sheet and the second sheet, separated from the first elastic member and extending in the stretching direction; when the first sheet and the second sheet are stretched flat in the stretching direction, the first sheet and the second sheet are joined by a plurality of linear joining units arranged in the stretching direction; each linear joining unit intersects with the first elastic member and the second elastic member; the joining width of each linear joining unit at a first intersection position between each linear joining unit and the first elastic member and the joining width of each linear joining unit at a second intersection position between each linear joining unit and the second elastic member are greater than the joining width of each linear joining unit between the first intersection position and the second intersection position; when the first elastic member and the second elastic member are contracted, the first sheet or the second sheet is bulged between the plurality of linear joining units to form gathers.

[0011] According to the present invention, a stretch sheet structure having gathers arranged neatly and having appropriate rigidity can be provided.

[0012] The stretch sheet structure of mode 2 of the present invention is stretched by applying a stretching force in a stretching direction and shrinks when the stretching force is released, and comprises: a first sheet; a second sheet overlapping the first sheet; a linear first elastic member located between the first sheet and the second sheet and extending along the stretching direction; a linear second elastic member located between the first sheet and the second sheet, separated from the first elastic member and extending along the stretching direction; when the first sheet and the second sheet are stretched flat in the stretching direction, the first sheet and the second sheet are joined by a plurality of linear joining units arranged along the stretching direction; each of the plurality of linear joining units exists between the first elastic member and the second elastic member in a cross direction intersecting the stretching direction, and the cross direction is inclined relative to a direction perpendicular to the stretching direction; each linear joining unit crosses the first elastic member and the second elastic member; when the first elastic member and the second elastic member are contracted, pleats are formed by bulging the first sheet or the second sheet between the plurality of linear joining units.

[0013] In mode 3 of the present invention, based on the stretch sheet structure of mode 2, the joining width of each linear joining unit at the first intersection position between each linear joining unit and the first elastic member, and the joining width of each linear joining unit at the second intersection position between each linear joining unit and the second elastic member are greater than the joining width of each linear joining unit between the first intersection position and the second intersection position.

[0014] Mode 4 of the present invention is based on the stretch sheet structure of Mode 1 or Mode 2 (or any one of Modes 1 to 3), and the plurality of linear joining units each exist continuously between the first elastic member and the second elastic member in a direction intersecting the stretching direction.

[0015] A fifth aspect of the present invention is the stretch sheet structure of aspect 1 or aspect 2 (or any of aspects 1 to 4), wherein in each of the linear joining units, the first sheet and the second sheet are joined by welding.

[0016] In mode 6 of the present invention, based on the stretch sheet structure of mode 1 or mode 2 (it can also be any one of modes 1 to 5), the first sheet and the second sheet are a sheet folded at a folding line; when the first sheet and the second sheet are stretched flatly in the stretching direction, the first elastic member is close to the folding line and parallel to the folding line, and each of the linear joining units and the folding line does not overlap.

[0017] Mode 7 of the present invention is based on the stretch sheet structure of Mode 1 or Mode 2 (it can also be any one of Modes 1 to 6), and further comprises: a linear third elastic member, the third elastic member is located between the first sheet and the second sheet, on the side of the second elastic member opposite to the first elastic member, separated from the second elastic member and extending along the stretching direction; each of the plurality of linear joining units is between the second elastic member and the third elastic member, in a direction intersecting the stretching direction; each of the linear joining units intersects with the third elastic member; the pleats are formed when the first elastic member, the second elastic member and the third elastic member are contracted; each of the linear joining units is linear when the first sheet and the second sheet are stretched flat in the stretching direction.

[0018] Mode 8 of the present invention is based on the stretch sheet structure of Mode 1 or Mode 2 (it can also be any one of Modes 1 to 6), and further comprises: a linear third elastic member, the third elastic member is located between the first sheet and the second sheet, on the side of the second elastic member opposite to the first elastic member, separated from the second elastic member and extending along the stretching direction; each of the plurality of linear joining units is located between the second elastic member and the third elastic member, in a direction intersecting the stretching direction; each of the linear joining units intersects with the third elastic member; the pleats are formed when the first elastic member, the second elastic member and the third elastic member are contracted; and each of the linear joining units is bent at the position of the second elastic member when the first sheet and the second sheet are stretched flat in the stretching direction.

[0019] Method 9 of the present invention is based on the stretch sheet structure of method 8. The angle direction of each linear joining unit inclined relative to the direction perpendicular to the stretching direction between the first elastic member and the second elastic member is opposite to the angle direction of each linear joining unit inclined relative to the direction perpendicular to the stretching direction between the second elastic member and the third elastic member.

[0020] Mode 10 of the present invention is based on the stretch sheet structure of Mode 7. When the first sheet and the second sheet are stretched flatly in the stretching direction, on the side opposite to the first elastic member and the second elastic member, the edges of the first sheet and the second sheet exist near the first elastic member along the first elastic member; and the interval between the first elastic member and the second elastic member is wider than the interval between the second elastic member and the third elastic member.

[0021] Mode 11 of the present invention is based on the stretch sheet structure of Mode 8 (it can also be Mode 8 or 9). When the first sheet and the second sheet are stretched flatly in the stretching direction, on the side opposite to the first elastic member and the second elastic member, the edges of the first sheet and the second sheet exist near the first elastic member along the first elastic member; the interval between the first elastic member and the second elastic member is wider than the interval between the second elastic member and the third elastic member.

[0022] Mode 12 of the present invention is based on the stretch sheet structure of Mode 1 or Mode 2 (it can also be any one of Modes 1 to 11). When the first sheet and the second sheet are stretched flat in the stretching direction, the existence range of each linear joining unit in the stretching direction partially overlaps with the existence range of the linear joining unit adjacent to each linear joining unit in the stretching direction.

[0023] A disposable absorbent article according to aspect 13 of the present invention is used to receive excrement from a wearer and has the stretch sheet structure of aspect 1 or 2 (or any of aspects 1 to 12).

[0024] A fourteenth aspect of the present invention is the disposable absorbent article according to the thirteenth aspect, wherein the gathers are in contact with the wearer's groin.

[0025] The above-mentioned object and other objects, features, aspects and advantages will become more apparent from the following detailed description of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view showing the structure of the absorbent article.

[0027] Figure 2 This is a perspective view showing one of the free states of the absorbent article.

[0028] Figure 3 is a cross-sectional view of an absorbent article.

[0029] Figure 4 is a cross-sectional view of an absorbent article.

[0030] Figure 5 It is an enlarged cross-sectional view showing the vicinity of the pleat.

[0031] Figure 6 This is an enlarged view showing the vicinity of the boundary between the central joint region and the end joint regions.

[0032] Figure 7 It is a top view showing a part of the gather piece.

[0033] Figure 8 It is a plan view showing a part of the absorbent article.

[0034] Figure 9 This is an enlarged view showing a linear bonding unit.

[0035] Figure 10 It is a perspective view showing the raised postures of the inner sheet and the outer sheet.

[0036] Figure 11 It is a diagram showing another example of the linear bonding unit.

[0037] Figure 12 It is a diagram showing still another example of the linear bonding unit.

[0038] Figure 13 It is a diagram showing still another example of the linear bonding unit.

[0039] Figure 14 It is a diagram showing still another example of the linear bonding unit.

[0040] Figure 15 It is a cross-sectional view showing another example of the standing gathers.

[0041] Figure 16 This is a cross-sectional view showing still another example of the standing gathers. DETAILED DESCRIPTION

[0042] Figure 1 1 is a top view showing the structure of a disposable absorbent article 1 (hereinafter also referred to as "absorbent article 1") according to one embodiment of the present invention. Figure 1 In the figure, the absorbent article 1 is shown unfolded into a flat surface. The absorbent article 1 is an auxiliary absorbent that is placed on the inner side (i.e., the wearer's side) of an outer article worn by the wearer and receives excrement from the wearer. The outer article is a disposable diaper, a non-disposable diaper, a diaper-like cover, etc. The absorbent article 1 is used by a person receiving care, for example, in a hospital or a nursing facility. Figure 1 In the description below, the side of the absorbent article 1 that contacts the wearer is depicted as the near side. Figure 1 The vertical direction is called the "longitudinal direction", and the left-right direction perpendicular to the longitudinal direction is called the "width direction". The absorbent article 1 is symmetrical. Figure 1 In the figure, the center line in the longitudinal direction is given a reference numeral 11.

[0043] Figure 2 This is a perspective view showing one free state of the absorbent article 1. As will be described later, the absorbent article 1 includes an elastic member, and the entire absorbent article 1 is in a curved state due to the contraction of the elastic member.

[0044] Figure 3 is Figure 1 The position of II II II shown in FIG is a cross-sectional view of the absorbent article 1 cut at a plane perpendicular to the longitudinal direction. Figure 2 As shown, since the pleats of the pleated sheet described later are erected by the contraction force of the elastic member, Figure 3 The pleats are depicted standing up. Figure 4 is Figure 1 The IV-IV position shown in FIG is a cross-sectional view of the absorbent article 1 cut along a plane perpendicular to the longitudinal direction.

[0045] like Figures 1 to 4 As shown, the absorbent article 1 includes a top sheet 21, an absorbent core 22 and a back sheet 23. The absorbent core 22 is located between the top sheet 21 and the back sheet 23. The top sheet 21 includes a center sheet 31 and a pair of pleated sheets 32. The pair of pleated sheets 32 are fixed to both side portions of the center sheet 31 (i.e., positions separated on both sides in the width direction) and extend in the longitudinal direction. Each pleated sheet 32 ​​exists along the entire longitudinal length of the center sheet 31. In other words, the longitudinal length of each pleated sheet 32 ​​is substantially the same as the longitudinal length of the absorbent article 1. The pleats 34, which are located on the inner side of the pair of pleated sheets 32 in the width direction, stand up toward the wearer when the absorbent article 1 is worn.

[0046] In the absorbent article 1, Figure 1 The upper part and the lower part in the absorbent article 1 are the front part and the rear part that are in contact with the wearer's abdominal and dorsal skin, respectively. In the absorbent article 1, the part that is continuous from the front part and the rear part between the front part and the rear part is the central part opposite to the wearer's crotch. The boundary between the front part and the central part and the boundary between the rear part and the central part do not need to be clearly defined. In the absorbent article 1, the front part, the central part and the rear part are arranged in sequence in the longitudinal direction. Figure 1 In the example shown, the absorbent article 1 is generally rectangular in shape when viewed from above, and the widths of the front, center, and rear portions in the width direction (i.e., the width in the left-right direction when worn, hereinafter also referred to as "width") are substantially the same. In other words, the width of the absorbent article 1 is generally constant along its entire longitudinal length. Figure 3 as well as Figure 4 The cross-sectional views of the central and front portions of the absorbent article 1 are shown. The cross-sectional view of the rear portion of the absorbent article 1 is shown. Figure 4 The cross-section of the front portion shown is substantially the same. The width of the absorbent article 1 does not need to be constant. For example, the width of the rear portion may be greater than the width of the front portion.

[0047] like Figure 1 、 Figure 3 as well as Figure 4As shown, the absorbent core 22 is sandwiched between the top sheet 21 and the back sheet 23. The top sheet 21 and the back sheet 23 are bonded around the absorbent core 22 using an adhesive. Figure 1 In FIG, the outline of the absorbent core 22 is depicted with a thin dotted line. Figure 3 as well as Figure 4 In order to facilitate understanding of the drawings, the absorbent article 1 is shown in the thickness direction (ie, Figure 3 as well as Figure 4 In the vertical direction, the absorbent article 1 is drawn larger than the actual size. In addition, the components of the absorbent article 1 that are actually in contact or joined are drawn appropriately separated in the thickness direction.

[0048] The center sheet 31 of the top sheet 21 quickly captures moisture from the wearer's excrement and moves it to the absorbent core 22. The absorbent core 22 absorbs the moisture that passes through the center sheet 31 and quickly fixes it. The back sheet 23 mainly prevents moisture from excrement that passes through the center sheet 31 and the absorbent core 22 and reaches the back sheet 23 from seeping out to the outside of the absorbent article 1. Figure 3 In the example shown, the absorbent core 22 contacts the center piece 31 and the back sheet 23, but a lining paper (e.g., tissue paper) may be disposed between the absorbent core 22 and the center piece 31, or a lining paper may be disposed between the absorbent core 22 and the back sheet 23. The absorbent core 22 may also be wrapped with other sheets, or the absorbent core 22 may be formed by overlapping a plurality of absorbent cores. That is, the absorbent core 22 and its peripheral structure may adopt various known structures.

[0049] The longitudinal length of the top sheet 21 and the back sheet 23 is longer than the length of the absorbent core 22. The width of the top sheet 21 and the back sheet 23 in the width direction is larger than the width of the absorbent core 22. The two side portions of the top sheet 21 (that is, the positions on both sides in the width direction) are directly joined to the two side portions of the back sheet 23 over the entire length or are indirectly joined via an intermediate. The width of the center piece 31 can be smaller than the width of the back sheet 23. In this case, the outer end portions of the pleated sheet 32 ​​in the width direction can also be joined to the back sheet 23. At the longitudinal end portions of the absorbent article 1, the longitudinal end portions of the top sheet 21 and the longitudinal end portions of the back sheet 23 are directly or indirectly joined. The top sheet 21 and the back sheet 23 are joined around the entire periphery of the absorbent core 22, whereby the absorbent core 22 as a whole is surrounded by the top sheet 21 and the back sheet 23. The top sheet 21 and the back sheet 23 are joined, for example, using a hot melt adhesive. The top sheet 21 and the back sheet 23 may be joined together by various methods other than hot melt adhesives.

[0050] As the core sheet 31, for example, a liquid-permeable nonwoven fabric (such as a point-bonded nonwoven fabric, a hot-rolled nonwoven fabric, or a spunbonded nonwoven fabric) made of hydrophobic fibers (such as polypropylene, polyethylene, polyester, polyamide, or nylon) whose surfaces have been hydrophilized by a surfactant can be used. Alternatively, a nonwoven fabric (such as a spunlace nonwoven fabric) made of hydrophilic fibers such as cellulose, rayon, or cotton can be used as the core sheet 31.

[0051] The back sheet 23 preferably has a laminated structure in which multiple sheets are laminated. For example, the back sheet 23 has a structure in which a nonwoven fabric is laminated on a liquid-repellent or liquid-impermeable nonwoven fabric or plastic film. When the back sheet 23 includes a plastic film, the plastic film is arranged relative to the absorbent core 22. The plastic film preferably has moisture permeability (breathability). Thus, the water resistance of the back sheet 23 can be improved, and the absorbent article 1 can be prevented from getting stuffy and the wearer's comfort can be improved. As the nonwoven fabric laminated on the plastic film, for example, a liquid-repellent or liquid-impermeable nonwoven fabric can be utilized. Thus, the feel of the back sheet 23, the skin feel, etc. can be made good. The nonwoven fabric is, for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or an SMS (spunbond-meltblown-spunbond) nonwoven fabric formed by hydrophobic fibers, which is treated with liquid repellency as needed.

[0052] The absorbent core 22 is a generally sheet-like member whose thickness is smaller than its length and width. The absorbent core 22 is disposed across the front, center, and rear portions of the absorbent article 1. Specifically, the absorbent core 22 is positioned on the wearer's ventral side, crotch, and back. The shape of the absorbent core 22, as viewed from above, can be modified in various ways. For example, the rear portion of the absorbent core 22 can be wider than the front portion. Alternatively, the center portion of the absorbent core 22 can be narrower than the front and rear portions.

[0053] The absorbent core 22 is, for example, a member in which a superabsorbent material is dispersed within a sheet-like fiber aggregate. The fiber aggregate is, for example, an aggregate of pulp fibers and / or synthetic fibers. The superabsorbent material is, for example, granular SAP (Super Absorbent Polymer) or fibrous SAF (Super Absorbent Fiber). The absorbent core 22 may also be a sheet-like fiber aggregate that does not contain a superabsorbent material. Alternatively, the absorbent core 22 may be a member that does not substantially contain fibers such as pulp fibers, but instead has a superabsorbent material fixed between two liquid-permeable sheet members (e.g., nonwoven fabrics) using a hot-melt adhesive or the like.

[0054] like Figure 1 as well as Figure 3 As shown, each pleated piece 32 has a side piece 321 and elastic members 3221 to 3223. Figure 1 as well as Figure 3 In the embodiment, only the pleated sheet 32 ​​on the right side is given reference numerals 321, 3221 to 3223. The side sheet 321 is a longitudinally long, generally strip-shaped sheet member. In this embodiment, three elastic members 3221 to 3223 are provided on the left and right pleated sheets 32, respectively. Each elastic member 3221 to 3223 is a linear member extending in the longitudinal direction and is fixed to the inner area of ​​the width direction of the side sheet 321. Figure 1 In the state where the absorbent article 1 is flatly unfolded, the elastic members 3221 to 3223 are stretched, and the elastic members 3221 to 3223 are contracted, so that Figure 2 As shown in FIG. 1 , the pleated sheet 32 ​​contracts and the absorbent article 1 is bent into a substantially cup shape. Figure 3 As shown, the inner portion of the gather sheet 32 ​​in the width direction stands upright from the center sheet 31 .

[0055] Figure 5 It is an enlarged representation Figure 3 The left pleat piece 32 also has the same structure. Figure 5 As shown, the side panel 321 has a structure in which an inner panel 331 and an outer panel 332 are overlapped by folding a single sheet. The folding position is the inner edge 333 of the gather panel 32 in the width direction. Three elastic members 3221 to 3223 are arranged between the inner panel 331 and the outer panel 332. Hereinafter, the three elastic members 3221 to 3223 are referred to as the "first elastic member 3221," the "second elastic member 3222," and the "third elastic member 3223," in order from the inner side to the outer side in the width direction. The first elastic member 3221 is arranged along the edge 333 of the gather panel 32. The second elastic members 3222 and the third elastic members 3223 are arranged to separate from the first elastic member 3221 in the width direction.

[0056] As the side sheet 321, a waterproof or liquid-impermeable nonwoven fabric (e.g., spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric, etc.) formed of hydrophobic fibers is used and subjected to liquid-repellent treatment as needed. As the elastic members 3221 to 3223, for example, polyurethane thread, strip-shaped polyurethane film, thread-shaped or strip-shaped natural rubber, etc. can be used.

[0057] The side panels 321 are fixed to the center panel 31. Figure 1 、 Figure 3 as well as Figure 4In the bonding area between the center piece 31 and the side piece 321, that is, the bonding area between the center piece 31 and the pleated piece 32 is given parallel oblique lines. In this embodiment, the center piece 31 and the pair of pleated pieces 32 are bonded by welding accompanied by pressure. Hereinafter, this bonding area is referred to as "compression bonding area 4". The so-called "welding accompanied by pressure" is hot melting while pressing, ultrasonic welding while applying ultrasonic vibration and pressing, etc., which is the so-called "embossing process". Since it is compressed by pressure, "welding accompanied by pressure" can also be regarded as "welding accompanied by compression". In addition, the bonding between the center piece 31 and the pleated piece 32 can also be combined with other bonding methods, such as a method of using a hot melt adhesive.

[0058] The compression joint area 4 includes a central joint area 41 located in the center of the longitudinal direction and end joint areas 42 located at both ends of the longitudinal direction. Figure 1 As shown, in one absorbent article 1, there are two central joining regions 41 and four end joining regions 42. Each central joining region 41 is separated from the three elastic members 3221 to 3223 to the outside in the width direction. Each end joining region 42 does not overlap with the three elastic members 3221 to 3223. Figure 1 As shown, each central joining region 41 is elongated in the longitudinal direction. Each end joining region 42 includes three linear regions extending in the longitudinal direction. Hereinafter, the three linear regions are referred to as "first linear region 421", "second linear region 422" and "third linear region 423" from the inner side to the outer side in the width direction. Figure 1 In the figure, only the upper right portion is given reference numerals 421 to 423. Furthermore, since the second linear region 422 and the third linear region 423 are located outside the second elastic member 3222 and the third elastic member 3223 in the width direction, they are collectively referred to as the "outer joining region 432," and the first linear region 421 located inside the second elastic member 3222 and the third elastic member 3223 in the width direction is referred to as the "inner joining region 431."

[0059] The inner joining region 431 and the outer joining region 432 are separated in the width direction. The second elastic member 3222 and the third elastic member 3223 are positioned in the width direction between the inner joining region 431 and the outer joining region 432. The innermost first elastic member 3221 is positioned inward in the width direction of the inner joining region 431. In other words, the width direction positions of the three elastic members 3221-3223 do not overlap with the width direction range of either the inner joining region 431 or the outer joining region 432.

[0060] When manufacturing the absorbent article 1, a plurality of absorbent cores 22 are sandwiched between a continuous top sheet 21 and a continuous back sheet 23, which correspond to a plurality of absorbent articles 1. Then, the stacked continuous body is cut to obtain individual absorbent articles 1. However, since the three elastic members 3221 to 3223 do not overlap with the end joining area 42, the ends of the three elastic members 3221 to 3223 are in a state of free contraction within the pleated sheet 32 ​​after cutting. Therefore, after cutting, the end joining area 42 is not subjected to any force from the elastic members 3221 to 3223. As a result, the end joining area 42 that has become hard due to compression bonding can be prevented from being subjected to the force from the elastic members 3221 to 3223 and being strongly bent inward, i.e., the wearer's side, and the wearing feel of the absorbent article 1 can be improved. In addition, Figure 1 In the embodiment, the longitudinal existence range of the end joint region 42 overlaps with the longitudinal existence range of the elastic members 3221 to 3223 , but these existence ranges do not necessarily need to overlap.

[0061] The second linear region 422 and the third linear region 423 are connected longitudinally inward. By dividing the outer joining region 432 into the second linear region 422 and the third linear region 423, the softness of the absorbent article 1 can be improved in the widthwise outer regions of the front and rear portions of the absorbent article 1. As a result, the widthwise outer regions of the front and rear portions can be easily aligned with the inner surface of the diaper (including the diaper-like cover; the same applies hereinafter) or the wearer's body, thereby improving the wearing feel. Furthermore, the breathability of the end joining region 42 is also improved.

[0062] Figure 6 It is an enlarged representation Figure 1 FIG. 4 is a diagram showing the vicinity of the boundary between the central bonding area 41 and the end bonding area 42 in the upper right corner. Figure 6 Each of the multiple points 40 is a segment of the compression bond region 4, i.e., a dot-shaped embossing, or a recessed area. Hereinafter, the points 40 will be referred to as "bonding elements 40." The compression bond region 4 is formed by multiple bonding elements 40, but the spacing between bonding elements 40 is small, so the area including the areas between bonding elements 40 is considered the compression bond region 4.

[0063] like Figure 6As shown by the lead lines at the top, the outer widthwise edges of the end joining regions 42 (widthwise position 443) are located widthwise inward of the inner widthwise edges of the central joining region 41 (widthwise position 442). By positioning the end joining regions 42 widthwise inward of the central joining region 41, there are no areas hardened by compression bonding in the widthwise outer regions of the front and rear portions of the absorbent article 1, thereby improving softness. As a result, the widthwise outer regions of the front and rear portions easily conform to the inner surface of the diaper or the wearer's body, thereby improving the wearing feel. By positioning the central joining region 41 widthwise outward of the end joining regions 42, the gathers 34 can be raised more substantially, effectively preventing side leakage of excrement. In addition, preferably, the size of the end joining area 42 in the width direction, that is, the distance between the position 443 of the outer edge of the end joining area 42 and the position 444 of the inner edge of the end joining area 42, is greater than the size of the central joining area 41 in the width direction, that is, greater than the distance between the position 441 of the outer edge and the position 442 of the inner edge of the central joining area 41.

[0064] Here, the central joining region 41 and the outer joining regions 432 are continuous in the longitudinal direction. This prevents excrement received by the absorbent article 1 from leaking out between the central joining region 41 and the outer joining regions 432. As described above, the spacing between the joining elements 40 is narrow enough to prevent excrement from leaking. More preferably, the compression joining region 4 extends across the entire longitudinal length of the top sheet 21. Thus, when the compression joining region 4 is formed using ultrasonic vibration, the ultrasonic vibration continuously acts on the protrusions of the roller (the so-called embossing roller) that forms the compression joining region 4. As a result, the ultrasonic vibration stably acts on the protrusions of the embossing roller, reducing fluctuations in the strength of the welded joint. In addition, wear of the protrusions of the embossing roller can be suppressed, thereby increasing the life of the embossing roller. Even when the compression joining region 4 is formed using hot melt, fluctuations in the linear pressure generated between the pair of rollers sandwiching the sheet formed with the compression joining region 4 can be suppressed, thereby reducing fluctuations in the strength of the welded joint. In addition, wear of the protrusions of the embossing roller can be suppressed, thereby increasing the life of the embossing roller.

[0065] More preferably, the maximum value of the total length of the compression bond in the width direction of the compression bonding area 4 is more than 1.25 times and less than 4 times the minimum value. Here, the "total length of the compression bond" refers to the total length of the range actually compressed and bonded on the straight line by the bonding element 40, etc., assuming a straight line extending in the width direction (the length of the range when the range is one). More preferably, the maximum value of the total length of the compression bond is more than 1.5 times and less than 3 times the minimum value. Thus, the ultrasonic vibration acts stably on the protrusion of the embossing roller, reducing the fluctuation in the strength of the weld bond. In addition, the wear of the protrusion of the embossing roller can be suppressed, thereby improving the life of the embossing roller. Even in the case of forming the compression bonding area 4 by hot melting, the fluctuation of the linear pressure generated between a pair of rollers clamping the thin sheet forming the compression bonding area 4 can be suppressed, thereby reducing the fluctuation in the strength of the weld bond. In addition, the wear of the protrusion of the embossing roller can be suppressed, thereby improving the life of the embossing roller.

[0066] The edge of the longitudinal center side of the end joint area 42 (at Figure 6 In the line designated by reference numeral 445, the edge portion of the end joint region 42 is indicated by a solid line, and the portion other than the edge is indicated by a dotted line) is a discontinuous line interrupted at the positions of the second elastic member 3222 and the third elastic member 3223, and the edge is inclined toward the longitudinal center as it moves toward the outer side in the width direction. In addition, the edge is not limited to a straight line, but may also be a curve. In the range of the edge interruption ( Figure 6 There is an additional joining area 401 on the outside in the width direction of the embossing roller (assigned with the reference numeral 446 in the figure). As a result, when the embossing roller rotates, the fluctuation of the protrusion range of the embossing roller acted on by the ultrasonic vibration is reduced, and the fluctuation of the weld joint strength is reduced. In addition, the wear of the protrusions of the embossing roller can be suppressed, and the life of the embossing roller can be improved. Even in the case of using hot melting to form the compression joining area 4, the fluctuation of the linear pressure generated between a pair of rollers can be suppressed, and the fluctuation of the weld joint strength can be reduced. In addition, the wear of the protrusions of the embossing roller can be suppressed, and the life of the embossing roller can be improved. In addition, the "additional joining area" can be understood as a skewed, isolated joining area in the end joining area 42, and the like, which should originally exist in a straight line from the surrounding shape. The additional joining area 401 can also be provided on the inside in the width direction of the range 446 where the edge is interrupted.

[0067] Here, for convenience, the edge of the central joining area 41 corresponding to the position 441 on the outside of the outermost joining element 40 located in the width direction of the central joining area 41 is called the "outer edge 441", the edge of the central joining area 41 corresponding to the position 442 on the inside of the innermost joining element 40 located in the width direction is called the "inner edge 442", the edge of the end joining area 42 corresponding to the position 443 on the outside of the outermost joining element 40 located in the width direction of the end joining area 42 is called the "outer edge 443", and the edge of the end joining area 42 corresponding to the position 444 on the inside of the innermost joining element 40 located in the width direction is called the "inner edge 444", then the existence ratio of the joining elements 40 between the outer edge 443 and the inner edge 444 of the end joining area 42 is smaller than the existence ratio of the joining elements 40 between the outer edge 441 and the inner edge 442 of the central joining area 41. Here, the "existence ratio of the joining elements 40" refers to the ratio of the number of joining elements 40 to the width of the compressed joining area 4 when the compressed joining area 4 is cut by a straight line extending in the width direction, or the ratio of the total length of the range where the joining elements 40 exist to the width of the compressed joining area 4. Alternatively, the "existence ratio of the joining elements 40" may be the ratio of the area of ​​the joining elements 40 to the area of ​​the entire target area.

[0068] By making the proportion of joining elements 40 in the end joining regions 42 smaller than that in the central joining region 41, the joining elements 40 are sparsely dispersed in the end joining regions 42. This improves the softness of the absorbent article 1 in the front and rear regions, particularly in the widthwise outer regions of the front and rear regions. As a result, the wearing feel is enhanced in the front and rear regions. Meanwhile, in the central joining region 41, the gather sheet 32 ​​is securely fixed to the center sheet 31, preventing side leakage of excrement.

[0069] like Figure 6 As shown, the first elastic member 3221 located most in the width direction is located inward of the inner joining region 431 (first linear region 421) in the width direction. This prevents unwanted force generated by the first elastic member 3221 from acting on the inner side of the first linear region 421 in the width direction while forming pleats up to the inner edge 333 of the gather sheet 32.

[0070] The portion of the gather sheet 32 ​​located inside the compression joint region 4 in the width direction is not fixed to the center sheet 31. This portion of the gather sheet 32 ​​can be separated from the center sheet 31 upward (i.e., toward the wearer when the absorbent article 1 is worn). Figure 5As shown, near the inner edge 333 of each side panel 321, the first elastic member 3221 is joined in a stretched state stretched in the longitudinal direction. The second elastic member 3222 and the third elastic member 3223 are separated from the first elastic member 3221 to the outside in the width direction and joined in a stretched state stretched in the longitudinal direction. The second elastic member 3222 and the third elastic member 3223 are also separated from each other in the width direction. When the absorbent article 1 is worn, the elastic members 3221 to 3223 in each pleat sheet 32 ​​are contracted, so that the portion located on the inner side of the width direction of the central joining area 41, as shown in FIG. Figure 3 As shown, the side panels 321 and the elastic members 3221 to 3223 separate upward from the center panel 31 and rise toward the wearer. Furthermore, the contraction of the elastic members 3221 to 3223 forms gathers 34 in the widthwise inner side of the central joining region 41 of the gather panel 32. This prevents urine and the like from leaking out of the leg openings in the absorbent article 1. Furthermore, while the side panels 321 and the elastic members 3221 to 3223 can be joined by ultrasonic vibration or heat welding, as described later, they can also be joined using an adhesive.

[0071] The absorbent article 1 can be modified in various ways. For example, the back sheet 23 is not limited to a single sheet. It can be a sheet composed of multiple overlapping sheets or a sheet composed of multiple sheets joined in the longitudinal or width direction. The back sheet 23 only needs to have the function of preventing the liquid in the absorbent core 22 from leaking to the outside of the absorbent article 1. Typically, the back sheet 23 includes a plastic film formed with countless fine holes and a non-woven fabric bonded to the outer surface of the plastic film. The expression back sheet 23 refers to the sheet covering the lower surface of the absorbent core 22, that is, the surface on the side opposite to the wearer.

[0072] The expression "top sheet 21" refers to the sheet covering the upper surface of the absorbent core 22, i.e., the surface facing the wearer. In the absorbent article 1 described above, the top sheet 21 includes a center sheet 31 and a pleat sheet 32, but may further include sheets other than these sheets. The center sheet 31 is liquid-permeable. However, the entire center sheet 31 does not need to be liquid-permeable. The center sheet 31 is not limited to a single sheet and may be a sheet composed of multiple overlapping sheets or a sheet composed of multiple sheets joined in the longitudinal or width directions.

[0073] The gather sheet 32 ​​is a sheet having gathers 34 that rise toward the wearer's groin. The structure and shape of the gather sheet 32 ​​are not limited thereto. The gather sheet 32 ​​may also be joined to the lower surface of the center sheet 31 by pressure welding. In this case, for example, the gather sheet 32 ​​may be joined to the lower surface of the center sheet 31 in the central joining region 41, and joined to the upper surface of the center sheet 31 in the end joining regions 42, where the gather sheet 32 ​​is folded upward at the edge of the center sheet 31.

[0074] The side panels 321 of the pleated sheet 32 ​​are not limited to being a single sheet material folded over, but can also be a sheet material formed by overlapping multiple sheets, or a sheet material formed by joining multiple sheets in the longitudinal or width direction. The pleated sheet 32 ​​prevents excrement from leaking outward in the width direction, and at least the inner side of the pleated sheet 32 ​​is hydrophobic. Figure 3 In the embodiment, the gathers 32 stand from the outside in the width direction to the inside, but may be stood toward the wearer's groin after being folded outward in the width direction in the central joining region 41 .

[0075] The number of elastic members of the pleat piece 32 can be one, two, or more than four. That is, at least one elastic member is provided in the pleat piece 32. The elastic member is preferably linear. The expression "linear" includes "thin line", "linear with a flat cross section", and "tape-shaped with a flat cross section". In either case, preferably, at least one elastic member does not overlap with the end joining area 42. To be precise, the position in the width direction of at least one elastic member does not overlap with the existence range in the width direction of the end joining area 42. Thereby, the contraction force of at least one elastic member acting on the end joining area 42 can be suppressed. Preferably, an elastic member is arranged along the edge 333 near the inner edge 333 of the side panel 321 in the width direction.

[0076] When the number of elastic members is 1, the outer joining area 432 is an area that exists on the outer side of the elastic member in the width direction. The inner joining area 431 is an area that exists on the inner side of the elastic member in the width direction. When the number of elastic members is 2 or more, the outer joining area 432 is an area that exists on the outer side of any one of the elastic members in the width direction. The inner joining area 431 is an area that exists on the inner side of the width direction of any one of the elastic members. In more general terms, the outer joining area 432 is an area that exists on the outer side of the width direction of any one of the elastic members (the number of any one of the elastic members can be one or more) in at least one elastic member, and the inner joining area 431 is an area that exists on the inner side of the width direction of any one of the elastic members. By making the end joining area 42 not overlap with any elastic member, the end joining area 42 will not be directly subjected to the force from the elastic member, thereby preventing the end joining area 42 that has hardened due to compression joining from moving inward ( Figure 1 The front side (the front side of the center paper), that is, the wearer side, is strongly curved, which can improve the wearing feeling of the absorbent article 1. In other words, compared with the case where the end joining area 42 and the elastic member overlap, the discomfort when wearing the absorbent article 1 can be reduced.

[0077] By providing the inner joining region 431 and the outer joining region 432 and positioning one or more (preferably, two, as in the above-described embodiment) elastic members between these regions in the width direction, the portion of the gather sheet 32 ​​where the gathers 34 are formed can be easily raised. By positioning at least one elastic member between the inner joining region 431 and the outer joining region 432, the overall shape of the gathers 34 can be stabilized. In the gather sheet 32, to ensure that the distal end of the gathers 34 is stably raised, the elastic member located most inward in the width direction of the plurality of elastic members is preferably located inward of the inner joining region 431 in the width direction. Furthermore, to position the inner joining region 431 as far inward as possible, the elastic member located second inward in the width direction of the plurality of elastic members is preferably located between the inner joining region 431 and the outer joining region 432 in the width direction. In other words, the number of elastic members located inward of the inner joining region 431 in the width direction is preferably one.

[0078] The at least one elastic member may be provided in various forms on the gather panel 32, but in any case, the presence range of the longitudinal elastic member and the presence range of the longitudinal end joining region 42 may or may not overlap.

[0079] In the above embodiment, the compression bond region 4 comprises a plurality of point-like bonding elements 40. However, it may also comprise a plurality of linear bonding elements or a mesh-like bonding pattern. Of course, the center sheet 31 and the gather sheet 32 ​​can be seamlessly welded throughout the entire compression bond region 4. In any case, the maximum total length of the compression bond in the width direction of the compression bond region 4 is preferably 1.25 to 4 times the minimum. More preferably, the maximum total length is 1.5 to 3 times the minimum.

[0080] Preferably, the compression bonding area 4 exists continuously from the front end bonding area 42 to the rear end bonding area 42. More preferably, the compression bonding area 4 exists across the entire longitudinal length of the top sheet 21. Here, the "continuous existence" of the compression bonding area 4 includes the case where the bonding element 40 is separated within a range where excrement does not leak. In addition, the compression bonding area 4 does not necessarily need to exist continuously. In the position where the compression bonding area 4 does not exist, the center piece 31 and the pleated piece 32 can also be bonded using an adhesive. In the above embodiment, the end bonding area 42 is divided into an inner bonding area 431 and an outer bonding area 432, but the inner bonding area 431 can be omitted. In this case, the outer bonding area 432 is consistent with the end bonding area 42. Preferably, by making the outer bonding area 432 and the central bonding area 41 continuous in the longitudinal direction, the entire compression bonding area 4 is continuous in the longitudinal direction.

[0081] In the above embodiment, the widthwise outer edges 443 of the end joint regions 42 are located widthwise inward of the widthwise inner edges 442 of the central joint region 41. However, the widthwise outer edges 443 of the end joint regions 42 may be located only widthwise inward of the widthwise outer edges 441 of the central joint region 41. In this case, the flexibility of the widthwise outer portions of the front and / or rear portions of the absorbent article 1 can also be improved. Furthermore, since the compression joint region 4 may be a collection of dot-shaped joint elements 40, as described above, the edges 441-444 refer to lines that connect the outer or inner sides of the compression joint region 4. When the edges 441-444 are curved, "one edge being widthwise inward of the other edge" generally means that the entire edge is widthwise inward of the entire edge of the other edge. However, this also includes cases where a very small portion of one edge or a very small portion of the other edge does not meet this definition.

[0082] In the above embodiment, the outer joining region 432 is composed of the second linear region 422 and the third linear region 423 extending in the longitudinal direction. However, it may also be composed of three or more linear regions. Furthermore, these linear regions do not have to be connected. In this case, the outermost linear region can be considered the outer joining region 432. By making the end joining region 42 a collection of linear regions, the flexibility of the end joining region 42 can be improved, and the breathability of the end joining region 42 can be enhanced. Preferably, at least the longitudinal end side of the end joining region 42 is a collection of multiple longitudinally extending linear regions.

[0083] Preferably, the center panel 31 and the pair of gather panels 32 are joined only in the compression joining region 4. That is, they are joined only by welding, and no adhesive is present between them. Of course, an adhesive may be used as an auxiliary to join the center panel 31 and the pair of gather panels 32 as needed.

[0084] The above-mentioned absorbent article 1 is merely exemplary, and the joining of the center piece 31 and the pleated piece 32 by welding described in the above embodiment can be used for various absorbent articles that receive excretions from the wearer, such as underwear-type disposable diapers, open-type disposable diapers with the waist fixed by tape, auxiliary absorbent members arranged in diapers or diaper-like covers, urine-absorbing pads, etc.

[0085] Next, the structure of the gather sheet 32 ​​will be described. Figure 7 Yes Figure 1 A top view of a portion of the pleated sheet 32 ​​on the right side of the front portion of the absorbent article 1. Figure 7 It is also shown in Figure 6 The structure of the pleated piece 32 is omitted. Figure 8 In the absorbent article 1 and Figure 6 The same part indicates Figure 7 Diagram of the structure. Figure 7 The diagram shows a portion of the gather sheet 32 ​​where the gathers 34 are formed and a portion of the end portion where the gathers 34 are not formed. The gathers 34 of the gather sheet 32 ​​include a stretch sheet structure that stretches in a stretching direction when a tensile force is applied and contracts when the tensile force is released.

[0086] exist Figure 7 In FIG. 1 , the thick line connecting the blackened portion and the blackened area represents the inner sheet 331 and the outer sheet 332 (see FIG. 1 ). Figure 5 ) The area joined by pressure welding. Dashed line 334 indicates the outer end of the inner sheet 331 in the width direction. The area joined by welding is the so-called embossed area. The so-called "pressure welding" includes heat welding with heating and pressing, ultrasonic welding with pressing while applying ultrasonic vibration, etc., which is the so-called "embossing process." Because the pressure is compressed, "pressure welding" can also be regarded as "compression welding." In addition, the inner sheet 331 and the outer sheet 332 can also be joined using other joining methods, such as a method using a hot melt adhesive.

[0087] If the inner sheet 331 and the outer sheet 332 are generally referred to as the "first sheet" and the "second sheet", then Figure 5 As shown, the second sheet overlaps the first sheet. The first elastic member 3221 is a linear elastic member located between the first sheet and the second sheet and extending in the stretching direction. The second elastic member 3222 is also a linear elastic member located between the first sheet and the second sheet, separate from the first elastic member 3221, and extending in the stretching direction. Furthermore, the third elastic member 3223 is also a linear elastic member located between the first sheet and the second sheet, and is separate from the second elastic member 3222 on the side opposite to the first elastic member 3221 and extending in the stretching direction.

[0088] exist Figure 7 In the figure, the vertical direction is the stretching direction of the gather sheet 32. When the gather sheet 32 ​​is stretched flat in the stretching direction, that is, when the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, the inner sheet 331 and the outer sheet 332 are joined in the gather 34 region by a plurality of linear joining units 5 arranged in the stretching direction. This allows the formation of beautiful gathers 34 with neatly arranged pleats.

[0089] exist Figure 7In the example shown in FIG. , the inner sheet 331 and the outer sheet 332 are joined by welding in each linear joining element 5, which is indicated by the blackened area. Welding can easily reduce the joining width of the linear joining elements 5 compared to using an adhesive, particularly at the intersection with the pair of elastic members, allowing for the formation of more aesthetically pleasing gathers 34. When joining by welding, it is preferable not to use an adhesive. In other words, it is preferable to join by welding alone.

[0090] Figure 9 : is an enlarged view showing three linear bonding units 5. Figure 9 In the figure, a linear joint element 5 is enclosed by a two-dot chain line. When the first elastic member 3221, the second elastic member 3222, and the third elastic member 3223 are contracted, the inner sheet 331 or the outer sheet 332 bulges between the plurality of linear joint elements 5, thereby forming gathers 34. Of course, the inner sheet 331 or the outer sheet 332 may also bulge between the plurality of linear joint elements 5, thereby forming gathers 34. Figure 10 3D is a perspective view showing the raised posture of the inner sheet 331 and the outer sheet 332. The cross section of the gather 34 cut with a plane perpendicular to the width direction is shown by the dotted line. Figure 10 As shown, in the gather sheet 32, gathers 34 are formed in which pleats are neatly arranged.

[0091] like Figure 9 As shown, the plurality of linear bonding elements 5 are each continuously disposed between the first elastic member 3221 and the second elastic member 3222, in a direction intersecting the stretching direction. Furthermore, the plurality of linear bonding elements 5 are each continuously disposed between the second elastic member 3222 and the third elastic member 3223, in a direction intersecting the stretching direction. The continuous presence of the linear bonding elements 5 allows for the formation of aesthetically pleasing gathers 34.

[0092] exist Figure 7In the example shown, the direction in which the linear joining elements 5 extend between the first elastic member 3221 and the second elastic member 3222 (i.e., the "intersecting direction" between the first elastic member 3221 and the second elastic member 3222) is the same as the direction in which the linear joining elements 5 extend between the second elastic member 3222 and the third elastic member 3223 (i.e., the "intersecting direction" between the second elastic member 3222 and the third elastic member 3223). In other words, when the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, each linear joining element 5 is linear. Hereinafter, the intersecting direction in which the linear joining elements 5 continuously extend between the first elastic member 3221 and the third elastic member 3223 is referred to as the "linear joining direction." The linear shape of the linear joining elements 5 allows the pleats from the first elastic member 3221 to the third elastic member 3223 to be linear, resulting in an aesthetically pleasing formation of the gathers 34.

[0093] The linear bonding direction is inclined relative to the direction perpendicular to the stretching direction. Furthermore, all linear bonding units 5 have the same linear bonding direction. By aligning the linear bonding direction in this manner, the contact force between the gathers 34 and the skin can be reduced. In particular, the momentary contact force between the gathers 34 and the skin can be reduced, improving the feel when worn.

[0094] exist Figure 9 In the example shown, two independent bonding regions 501 and 502 are present on the side of the third elastic member 3223 opposite the first elastic member 3221. These bonding regions 501 and 502 may or may not be included in the linear bonding elements 5. When the bonding regions 501 and 502 are included in the linear bonding elements 5, the linear bonding elements 5 are discontinuously present on the side of the third elastic member 3223 opposite the first elastic member 3221.

[0095] like Figure 5 As shown, the inner sheet 331 and the outer sheet 332 are a sheet material folded at the edge 333. Since the edge 333 is the folding line of the sheet material, the edge 333 is also referred to as the "folding line 333" below. Figure 7As shown, when the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, the first elastic member 3221 is located near the folding line 333 and parallel to the folding line 333. On the other hand, each linear joining unit 5 does not overlap with the folding line 333. That is, each linear joining unit 5 exists only in front of the folding line (edge) 333. In other words, each linear joining unit 5 is separated from the folding line 333. As a result, it is possible to prevent the pleated sheet 32 ​​from becoming hardened at the folding line (edge) 333 due to welding, and the skin feel of the pleat 34 can be improved. In particular, the tactile feel when the end of the pleat 34 contacts the groin area can be improved. The distance between the folding line 333 and the first elastic member 3221 is preferably less than 5 mm, and more preferably less than 3 mm.

[0096] Each linear bonding unit 5 intersects the first elastic member 3221, the second elastic member 3222, and the third elastic member 3223. Figure 9 The intersection of each linear bonding unit 5 and the first elastic member 3221 is referred to as a "first intersection 511," the intersection of each linear bonding unit 5 and the second elastic member 3222 is referred to as a "second intersection 512," and the intersection of each linear bonding unit 5 and the third elastic member 3223 is referred to as a "third intersection 513." The bonding width of the linear bonding unit 5 at the first intersection 511 is greater than the bonding width of the linear bonding unit 5 between the first intersection 511 and the second intersection 512. The bonding width of the linear bonding unit 5 at the second intersection 512 is greater than the bonding width of the linear bonding unit 5 between the first intersection 511 and the second intersection 512, and greater than the bonding width of the linear bonding unit 5 between the second intersection 512 and the third intersection 513. The bonding width of the linear bonding unit 5 at the third intersection 513 is greater than the bonding width of the linear bonding unit 5 between the second intersection 512 and the third intersection 513.

[0097] As long as the width of the linear bonding unit 5 is roughly determined, the "bonding width" can be set to various widths. For example, the bonding width can be set to the width (length) when the linear bonding unit 5 is cut along a straight line parallel to the stretching direction. Alternatively, the bonding width can be set to the width (length) when the linear bonding unit 5 is cut along a straight line perpendicular to the linear bonding direction. The bonding width between two adjacent intersections is smaller than the bonding width at the intersection. In other words, the bonding width of the linear bonding unit 5 is relatively large at the intersection.

[0098] By making the joining width relatively small except for the intersection position, regular and large pleats can be formed in the gathers 34 (compared to the case where the linear joining unit 5 is made thicker as a whole). On the other hand, the first elastic member 3221, the second elastic member 3222, and the third elastic member 3223 can be firmly fixed to the inner sheet 331 and the outer sheet 332 at the intersection position.

[0099] Strictly speaking, at the intersection, the elastic member is not cut by heat, and the elastic member is fixed to the inner sheet 331 and the outer sheet 332. To achieve this fixation, the inner sheet 331 and the outer sheet 332 are welded together on both sides of the elastic member in the width direction, and the inner sheet 331 and the elastic member, and the outer sheet 332 and the elastic member are only slightly welded together. To achieve this welding, the protrusions of the embossing roller used during welding form grooves that avoid the elastic member. Thus, for example, on both sides of the elastic member in the width direction, the inner sheet 331 and the elastic member are slightly welded together, or the outer sheet 332 and the elastic member are slightly welded together. Alternatively, heating is performed while the elastic member is sandwiched between the inner sheet 331 and the outer sheet 332 with a weak pressure, so that the elastic member is welded to at least one of the inner sheet 331 and the outer sheet 332.

[0100] In the gathers 34, the linear bonding elements 5 are inclined relative to the direction perpendicular to the stretching direction between the first elastic member 3221 and the second elastic member 3222, and between the second elastic member 3222 and the third elastic member 3223. This facilitates the deflection of the gathers 34 when the gathers 34 come into contact with the skin. As a result, the wearing comfort of the absorbent article 1 can be improved.

[0101] exist Figure 7 In the example shown, when the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, an edge 333 of the inner sheet 331 and the outer sheet 332 exists near the first elastic member 3221 along the first elastic member 3221 on the side opposite to the first elastic member 3221 and the second elastic member 3222. That is, the edge 333 of the gather sheet 32, the first elastic member 3221, the second elastic member 3222 and the third elastic member 3223 are arranged in this order toward the outside in the width direction. Moreover, the interval between the first elastic member 3221 and the second elastic member 3222 is wider than the interval between the second elastic member 3222 and the third elastic member 3223. Thus, the gather 34 can be easily bent at the end side of the gather 34, i.e., the side of the first elastic member 3221, thereby improving the wearing feel; and the rigidity can be increased at the root side of the gather 34, i.e., the side of the third elastic member 3223, thereby making the gather 34 stand up stably (to be described later). Figures 11 to 14 or the same applies to other modified examples).

[0102] like Figure 9 As shown by reference numeral 52 in the figure, when the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, the range 52 of each linear bonding unit 5 in the stretching direction partially overlaps with the range 52 of the linear bonding unit 5 adjacent to the linear bonding unit 5 in the stretching direction (to be described later). Figures 11 to 14 (This also applies to other variations.) Furthermore, even if the linear bonding elements 5 are understood to exist only between the first elastic member 3221 and the third elastic member 3223, the aforementioned ranges of adjacent linear bonding elements 5 overlap. This suppresses fluctuations in the linear pressure generated by the embossing roller during welding, reducing fluctuations in weld strength and the risk of pores forming during welding. Furthermore, wear of the protrusions on the embossing roller can be suppressed, extending the life of the embossing roller.

[0103] Figure 11 is a diagram showing another example of the linear bonding unit 5, and Figure 9 Likewise, three linear bonding units 5 are shown. Figure 11 The linear bonding unit 5 is discontinuous between the first elastic member 3221 and the second elastic member 3222, and is also discontinuous between the second elastic member 3222 and the third elastic member 3223. In this way, the linear bonding unit 5 may also be discontinuous between the elastic members. Figure 11 Other structures of the linear bonding unit 5 and Figure 9 The same. That is, the bonding width of the linear bonding unit 5 at the first intersection position 511 is greater than the bonding width of the linear bonding unit 5 between the first intersection position 511 and the second intersection position 512. The bonding width of the linear bonding unit 5 at the second intersection position 512 is greater than the bonding width of the linear bonding unit 5 between the first intersection position 511 and the second intersection position 512, and greater than the bonding width of the linear bonding unit 5 between the second intersection position 512 and the third intersection position 513. The bonding width of the linear bonding unit 5 at the third intersection position 513 is greater than the bonding width of the linear bonding unit 5 between the second intersection position 512 and the third intersection position 513. The following description Figure 13 as well as Figure 14 The same is true in Chinese.

[0104] Furthermore, the linear joining elements 5 are linear, and in the gathers 34, between the first elastic member 3221 and the second elastic member 3222, and between the second elastic member 3222 and the third elastic member 3223, each linear joining element 5 is inclined relative to the direction perpendicular to the stretching direction. In addition to the point that the linear joining elements 5 are continuous between the first elastic member 3221 and the third elastic member 3223, Figure 9 The description of the linear bonding unit 5 also applies to Figure 11 example.

[0105] Figure 12 is a diagram showing still another example of the linear bonding unit 5, and Figure 9 Similarly, three linear bonding units 5 are shown. Figure 12 In the linear joining unit 5, the joining width between the first elastic member 3221 and the third elastic member 3223 is constant. That is, the joining width at the first intersection position 511, the second intersection position 512 and the third intersection position 513 is the same as the joining width between the first intersection position 511 and the second intersection position 512, and the joining width between the second intersection position 512 and the third intersection position 513 is also the same. As long as the intervals between the linear joining units 5 are wide enough to form sufficiently large pleats, the joining width of the linear joining units 5 can also be constant. In addition to the constant joining width of the linear joining units 5, Figure 9 The description of the linear bonding unit 5 also applies to Figure 12 example.

[0106] Figure 13 is a diagram showing still another example of the linear bonding unit 5, and Figure 9 Similarly, three linear joint units 5 are shown. When the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, Figure 13 Each linear bonding unit 5 is bent at the position of the second elastic member 3222, that is, the second intersection position 512. Figure 13 Other structures of the linear bonding unit 5 and Figure 9 The same as the linear bonding unit 5, except that the linear bonding unit 5 is bent, Figure 9 The description of the linear bonding unit 5 also applies to Figure 13 example.

[0107] Figure 13 The plurality of linear bonding elements 5 are located between the first elastic member 3221 and the second elastic member 3222 in a first intersecting direction intersecting the stretching direction, and between the second elastic member 3222 and the third elastic member 3223 in a second intersecting direction intersecting the stretching direction. Furthermore, by making the first and second intersecting directions different, the linear bonding elements 5 are bent. At the first intersecting location 511, the second intersecting location 512, and the third intersecting location 513, the linear bonding elements 5 intersect the first elastic member 3221, the second elastic member 3222, and the third elastic member 3223, respectively. In the gathers 34, when the first elastic member 3221, the second elastic member 3222, and the third elastic member 3223 are contracted, pleats are formed between each pair of adjacent linear bonding elements 5, and the collection of these pleats forms the gathers 34.

[0108] By bending the pleats, the rigidity of the gathers 34 can be reduced. That is, when the gathers 32 are contracted and the edges 333 (see Figure 5 ) and the body, the gathers 34 are easily bent at the second intersection 512. This allows the gathers 34 to smoothly contact the body, improving the wearing comfort of the absorbent article 1. Furthermore, by bending the gathers 34, a larger space is ensured inside the gathers 34, allowing a larger amount of excrement to be received at one time.

[0109] Preferably, the first and second intersecting directions are opposite to the direction perpendicular to the stretching direction. In other words, the angle at which each linear joining element 5 is inclined relative to the direction perpendicular to the stretching direction between the first elastic member 3221 and the second elastic member 3222 is opposite to the angle at which each linear joining element 5 is inclined relative to the direction perpendicular to the stretching direction between the second elastic member 3222 and the third elastic member 3223. In other words, each linear joining element 5 is generally V-shaped. This allows each pleat to bend like a spring, enhancing the feel of the pleats 34 against the skin.

[0110] In addition, in order to make the gathers 34 stand up more appropriately, the second intersecting direction, which is the extending direction of the linear bonding unit 5 between the second elastic member 3222 and the third elastic member 3223, may be perpendicular to the stretching direction.

[0111] Figure 14 is a diagram showing still another example of the linear bonding unit 5, and Figure 13 Similarly, three linear joint units 5 are shown. When the inner sheet 331 and the outer sheet 332 are stretched flat in the stretching direction, Figure 14 Each linear bonding unit 5 is bent at the position of the second elastic member 3222, that is, the second intersection position 512. Figure 14 The linear bonding unit 5 is discontinuous between the first elastic member 3221 and the second elastic member 3222 , and is also discontinuous between the second elastic member 3222 and the third elastic member 3223 . Figure 14 Other structures of the linear bonding unit 5 and Figure 13 Except that the linear bonding unit 5 is discontinuous between the first elastic member 3221 and the third elastic member 3223, Figure 13 Description of the linear bonding unit 5 and applicable to Figure 13 of Figure 9 The description of the linear bonding unit 5 also applies to Figure 14 example.

[0112] and Figure 3 Same, Figure 1532 is a cross-sectional view showing another example of the raised gathers 32. Figure 15 In, right and Figure 3 The same components are denoted by the same reference numerals. Figure 15 The gather piece 32 rises from the widthwise inner side of the central joint region 41 toward the widthwise outer side, and after passing through the third elastic member 3223 and the second elastic member 3222, faces the widthwise inner side. The first elastic member 3221 is positioned near the widthwise inner end of the gather piece 32. Similarly, the gathers 34 can first face the widthwise outer side and then rise toward the inner side. This increases the space inside the gathers 34.

[0113] and Figure 3 Same, Figure 16 3 is a cross-sectional view showing yet another example of the raised gathers 32. Figure 16 In, right and Figure 3 The same components are denoted by the same reference numerals. Figure 16 The pleat piece 32 stands up from the inner side of the width direction of the central joint area 41 toward the inner side of the width direction, then stands up toward the outer side, and after passing through the third elastic member 3223 and the second elastic member 3222, stands toward the inner side of the width direction. The first elastic member 3221 is arranged near the end of the inner side of the pleat piece 32 in the width direction. In this way, the pleat 34 can also stand up toward the inner side of the width direction first, then toward the outer side, and then toward the inner side. In this way, the space inside the pleat 34 can be increased. Figure 15 or Figure 16 In the pleated sheet 32, since the pleats 34 are bent in section, it is preferred to use Figure 13 or Figure 14 Such a bent linear bonding unit 5.

[0114] The structure and use of the pleated sheet 32 ​​can be modified in various ways. The stretch sheet structure of the pleated sheet 32 ​​can also be used in various parts of the absorbent article 1 other than the pleats 34 that come into contact with the human groin. In the above description, the stretch sheet structure is a structure formed by the inner sheet 331, the outer sheet 332, the elastic member, and the linear joint unit 5. It is a structure that is stretched in the stretching direction by the application of a tensile force and contracts when the tensile force is released. The pleats 34 can be understood as the stretch sheet structure itself, or as a structure contained in the stretch sheet structure. An object containing a stretch sheet structure can be expressed as a "stretch sheet structure." The pleats 34 and pleated sheet 32 ​​in the above description are also stretch sheet structures.

[0115] Absorbent articles with the aforementioned stretch panel structure are not limited to auxiliary absorbents. They can also include various absorbent articles that collect excretion from the wearer, such as brief-type disposable diapers, open-type disposable diapers secured at the waist with tape, auxiliary absorbents placed in diapers or diaper-like covers, and urine-absorbing pads. The stretch panel structure can, for example, be used to form gathers around the waist or legs of a disposable diaper. Similarly, the inner sheet 331 and outer sheet 332 sandwiching the elastic members can be sheets of other uses. In the stretch panel structure, these sheets sandwiching the elastic members can be generally referred to as the "first sheet" and "second sheet." The number of elastic members is not limited to three; it is at least two and can be four or more. Specifically, the stretch panel structure comprises at least: a first sheet; a second sheet overlapping the first sheet; a first elastic member extending in the direction of stretch, located between the first and second sheets; and a second elastic member extending in the direction of stretch, located between the first and second sheets and spaced from the first elastic member.

[0116] The first and second sheets do not need to be formed by bending a single sheet; they may be separate sheets. The first and second sheets may be made of the same material or different materials. The first and second sheets are not limited to non-woven fabrics; they may also be made of plastic film or other materials, and may be either hydrophilic or hydrophobic.

[0117] In a state where the first sheet and the second sheet are stretched flat in the stretching direction, the first sheet and the second sheet are joined by a plurality of linear joining units arranged along the stretching direction. Figure 9 、 Figures 11 to 14 Like the linear joining units 5, the shapes of the plurality of linear joining units can be straight or bent. Each linear joining unit can be bent in two or more places, or can be a curve. For example, each linear joining unit can be roughly C-shaped in the horizontal direction, or can be roughly S-shaped in the horizontal direction. The shapes of the plurality of linear joining units do not need to be exactly the same. For example, the shapes of the plurality of linear joining units can also gradually change toward the stretching direction. In this way, between the first elastic member and the second elastic member, the plurality of linear joining units exist in directions intersecting the stretching direction, but the intersection direction does not need to be constant as long as it is not parallel to the stretching direction.

[0118] In addition, if Figure 9 、 Figures 11 to 14As shown, preferably, the direction of the intersection is inclined relative to the direction perpendicular to the stretching direction. Thus, a stretch sheet structure having pleats with neatly arranged pleats and appropriate rigidity can be provided. The direction of the intersection, i.e., the direction in which the linear joining unit extends, is preferably inclined by more than 3° and less than 25° relative to the width direction, and more preferably, by more than 5° and less than 20° relative to the width direction. In addition, in the case where the direction of the intersection changes in the width direction, the direction in which the linear joining unit extends may also include a portion parallel to the width direction. In the case where Figure 13 、 Figure 14 In the case where the linear joining element shown is bent, in order to facilitate bending at the distal end of the pleat, the inclination angle of the extending direction of the linear joining element between the first elastic member and the second elastic member on the distal end relative to the width direction is preferably greater than the inclination angle of the extending direction of the linear joining element between the second elastic member and the third elastic member (not on the distal end) relative to the width direction. In this case, the inclination direction of the extending direction of the linear joining element between the first elastic member and the second elastic member relative to the width direction and the inclination direction of the extending direction of the linear joining element between the second elastic member and the third elastic member relative to the width direction may be the same or different.

[0119] The phrase "a state in which the first sheet and the second sheet are stretched flat in the stretching direction" means a state in which the stretch sheet structure is stretched until the gathers disappear. In this state, each elastic member is in a stretched state.

[0120] As described above, in the stretch sheet structure, the number of elastic members is at least 2. Therefore, when focusing on the two elastic members and generally referring to them as "first elastic member" and "second elastic member" (of course, these elastic members are not limited to Figure 3 The first elastic member 3221 and the second elastic member 3222 shown in the figure form pleats by causing the first sheet or the second sheet to bulge between the plurality of linear joining units when the first and second elastic members are contracted. "Bulging" means bulging to form pleats, for example, referring to a portion of the first sheet or a portion of the second sheet moving away from a surface including the plurality of linear joining units. Alternatively, the first sheet and the second sheet may bulge between the plurality of linear joining units. At least one of the first sheet and the second sheet does not need to be "completely" bulged between the plurality of linear joining units; it is sufficient that it is substantially bulged between the plurality of linear joining units.

[0121] When focusing on the first elastic member and the second elastic member, as described above, preferably, the joining width of the linear joining unit at the first intersection position of each linear joining unit and the first elastic member, and the joining width of the linear joining unit at the second intersection position of the linear joining unit and the second elastic member, are greater than the joining width of the linear joining unit between the first intersection position and the second intersection position. As described above, as long as the width of the linear joining unit is roughly set, the "joining width" can be defined in various ways. By increasing the joining width at the intersection position, the joining of the first sheet and the second sheet to the first elastic member and the second elastic member can be made firm, and the softness of the pleats can be ensured. By increasing the joining width only at the intersection position, the rigidity of the pleats can be prevented from being excessively increased, the cushioning property of the pleats can be obtained, and an excellent skin feel can be obtained. As a result, a stretch sheet structure can be provided that forms pleats with neatly arranged pleats and has appropriate rigidity.

[0122] Preferably, the joining width at the first and second intersections is 5 to 12 times the joining width between the first and second intersections. More preferably, it is 7 to 10 times. This makes it easy to form sufficiently large pleats.

[0123] In order to ensure the softness of the pleats, the technology of tilting the linear joining unit relative to the direction perpendicular to the stretching direction and increasing the joining width of the linear joining unit at the intersection of the linear joining unit and the elastic component are independent technologies, and it is not necessary to apply both technologies to the stretch sheet structure.

[0124] Each linear joining unit crosses the first elastic member and the second elastic member at a first crossing position and a second crossing position, respectively. As described above, at the position overlapping with the elastic member, the first sheet and the second sheet are not completely joined due to the presence of the elastic member. That is, the "crossing" of the linear joining unit and the elastic member refers to the conceptual crossing of the linear joining unit and the elastic member, and does not mean that the joining area of ​​the first sheet and the second sheet overlaps with the elastic member. As described above, the linear joining unit may exist continuously or discontinuously in the above-mentioned crossing direction. In the case where a certain degree of rigidity is desired to be imparted to the gathers, it is preferred that the linear joining unit is continuous between the elastic members. Thus, for example, when the gathers are in contact with the groin, leakage of excrement such as urine can be suppressed. The linear joining unit refers to the joining area that contributes to the formation of pleats. Figure 9 、 Figures 11 to 14 In the example of FIG, it refers to the bonding area between the inner sheet 331 and the outer sheet 332, mainly between the first elastic member 3221 and the third elastic member 3223, but may also include areas 501 and 502. At least the bonding area between adjacent elastic members is understood as a linear bonding unit.

[0125] Preferably, the joining of the first sheet and the second sheet of the linear joining unit is by welding. However, the joining may be performed by using an adhesive, or by using both welding and adhesive. In the case of joining by welding, preferably, the first sheet and the second sheet are waterproof or liquid-impermeable nonwoven fabrics formed of hydrophobic fibers. For example, the first sheet and the second sheet are the same or different materials selected from spunbond nonwoven fabrics, meltblown nonwoven fabrics, SMS nonwoven fabrics, etc. By utilizing welding, pleats can be reliably formed, and beautiful pleats can be stably formed in which the pleats are arranged uniformly in the stretching direction. In addition, since pleats can be stably formed, contact between the elastic member, the linear joining unit (i.e., the welding area) and the skin can be suppressed, thereby improving the skin feel.

[0126] like Figure 9 、 Figures 11 to 14 As shown in the example, when the number of elastic members is three, these elastic members are generally referred to as "first elastic member", "second elastic member" and "third elastic member" (of course, these elastic members are not limited to Figure 3 In the example shown in FIG1 , the description of the first and second elastic members ( 3221 , 3222 , and 3223 ) is applicable to the description of the second and third elastic members. Specifically, each of the plurality of linear joining elements is located between the second and third elastic members, intersecting the direction of stretching, and intersecting the second and third elastic members. Furthermore, when the first, second, and third elastic members are contracted, pleats form between adjacent linear joining elements, thereby forming gathers.

[0127] Preferably, the joining width of each linear joining unit at the second intersection position between the linear joining unit and the second elastic member, and the joining width of the linear joining unit at the third intersection position between the linear joining unit and the third elastic member, are greater than the joining width of the linear joining unit between the second intersection position and the third intersection position. The other descriptions regarding the first and second elastic members above are also applicable to the descriptions regarding the second and third elastic members.

[0128] The stretch sheet structure can also be used in products other than absorbent articles, and can be used in various products where neatly arranged gathers are desired.

[0129] The configurations in the above-described embodiment and various modifications may be appropriately combined as long as they do not contradict each other.

[0130] Although the present invention has been described and illustrated in detail, the above description is illustrative rather than restrictive. Therefore, many variations or implementations are possible without departing from the scope of the present invention.

[0131] Explanation of symbols

[0132] 1. Absorbent articles

[0133] 5 Linear bonding unit

[0134] 34 pleats

[0135] 331 inner piece (first piece)

[0136] 332 outer piece (second piece)

[0137] 333 edge (fold line)

[0138] 511 First intersection position

[0139] 512 Second intersection position

[0140] 3221 first elastic member

[0141] 3222 second elastic member

[0142] 3223Third elastic member.

Claims

1. A stretch sheet structure that stretches in a stretching direction by a tensile force and contracts when the tensile force is released, characterized in that: have: First piece; a second piece, overlapping the first piece; a linear first elastic member, located between the first sheet and the second sheet and extending along the stretching direction; a linear second elastic member, located between the first sheet and the second sheet, separated from the first elastic member and extending along the stretching direction; In a state where the first sheet and the second sheet are stretched flat in the stretching direction, the first sheet and the second sheet are joined by a plurality of linear joining units arranged along the stretching direction; Each linear bonding unit intersects the first elastic member and the second elastic member; The joining width of each linear joining unit at a first intersection position between each linear joining unit and the first elastic member, and the joining width of each linear joining unit at a second intersection position between each linear joining unit and the second elastic member, are greater than the joining width of each linear joining unit between the first intersection position and the second intersection position; When the first elastic member and the second elastic member are contracted, the first sheet or the second sheet is raised between the plurality of linear bonding units, thereby forming gathers.

2. A stretch sheet structure that is stretched by a tensile force acting in a stretching direction and contracts when the tensile force is released, characterized in that: have: First piece; a second piece, overlapping the first piece; a linear first elastic member, located between the first sheet and the second sheet and extending along the stretching direction; a linear second elastic member, located between the first sheet and the second sheet, separated from the first elastic member and extending along the stretching direction; In a state where the first sheet and the second sheet are stretched flat in the stretching direction, the first sheet and the second sheet are joined by a plurality of linear joining units arranged along the stretching direction; Each of the plurality of linear bonding units is located between the first elastic member and the second elastic member in a direction intersecting the stretching direction, and the intersecting direction is inclined relative to a direction perpendicular to the stretching direction. Each linear bonding unit intersects the first elastic member and the second elastic member; When the first elastic member and the second elastic member are contracted, the first sheet or the second sheet is raised between the plurality of linear bonding units, thereby forming gathers.

3. The expansion piece structure according to claim 2, characterized in that: The joining width of each linear joining unit at a first intersection position between each linear joining unit and the first elastic member, and the joining width of each linear joining unit at a second intersection position between each linear joining unit and the second elastic member, are greater than the joining width of each linear joining unit between the first intersection position and the second intersection position.

4. The expansion piece structure according to claim 1 or 2, characterized in that: Each of the plurality of linear bonding elements is continuously present between the first elastic member and the second elastic member in a direction intersecting the stretching direction.

5. The expansion piece structure according to claim 1 or 2, characterized in that: In each of the linear bonding units, the first sheet and the second sheet are bonded by welding.

6. The expansion piece structure according to claim 1 or 2, characterized in that: The first sheet and the second sheet are a sheet folded at a folding line; When the first sheet and the second sheet are stretched flat in the stretching direction, the first elastic member is close to and parallel to the folding line, and each of the linear bonding units does not overlap with the folding line.

7. The expansion sheet structure according to claim 1 or 2, characterized in that: Also features: a linear third elastic member, the third elastic member being located between the first sheet and the second sheet, on a side of the second elastic member opposite to the first elastic member, separated from the second elastic member, and extending along the stretching direction; Each of the plurality of linear bonding units is located between the second elastic member and the third elastic member in a direction intersecting the stretching direction; Each of the linear joining units intersects with the third elastic member; The gathers are formed when the first elastic member, the second elastic member, and the third elastic member are contracted; When the first sheet and the second sheet are stretched flat in the stretching direction, each of the linear bonding units has a linear shape.

8. The expansion piece structure according to claim 1 or 2, characterized in that: Also features: a linear third elastic member, the third elastic member being located between the first sheet and the second sheet, on a side of the second elastic member opposite to the first elastic member, separated from the second elastic member, and extending along the stretching direction; Each of the plurality of linear bonding units is located between the second elastic member and the third elastic member in a direction intersecting the stretching direction; Each of the linear joining units intersects with the third elastic member; The gathers are formed when the first elastic member, the second elastic member, and the third elastic member are contracted; In a state where the first sheet and the second sheet are stretched flat in the stretching direction, each of the linear bonding elements is bent at the position of the second elastic member.

9. The expansion piece structure according to claim 8, characterized in that: An angle direction in which each linear joining unit is inclined relative to a direction perpendicular to the stretching direction between the first elastic member and the second elastic member is opposite to an angle direction in which each linear joining unit is inclined relative to a direction perpendicular to the stretching direction between the second elastic member and the third elastic member.

10. The expansion piece structure according to claim 7, characterized in that: When the first sheet and the second sheet are stretched flat in the stretching direction, the edges of the first sheet and the second sheet are located near the first elastic member on the side of the first elastic member opposite to the second elastic member and along the first elastic member; An interval between the first elastic member and the second elastic member is wider than an interval between the second elastic member and the third elastic member.

11. The expansion piece structure according to claim 8, characterized in that: When the first sheet and the second sheet are stretched flat in the stretching direction, the edges of the first sheet and the second sheet are located near the first elastic member on the side of the first elastic member opposite to the second elastic member and along the first elastic member; An interval between the first elastic member and the second elastic member is wider than an interval between the second elastic member and the third elastic member.

12. The expansion piece structure according to claim 1 or 2, characterized in that: When the first sheet and the second sheet are stretched flat in the stretching direction, the range of each linear bonding unit in the stretching direction partially overlaps the range of an adjacent linear bonding unit in the stretching direction.

13. A disposable absorbent article for receiving excreta from a wearer, characterized in that: A stretch sheet structure according to claim 1 or 2 is provided.

14. The disposable absorbent article according to claim 13, wherein The gathers are in contact with the wearer's groin.

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