Articles equipped with stretchable sheets

Abstract

In an expandable sheet in which filamentous elastic members are intermittently fixed in the expansion and contraction direction, the method reduces the expansion and contraction force in a portion of the sheet while suppressing the detachment of cut filamentous elastic members. [Solution] An article comprising an expandable sheet, the expandable sheet comprising a pair of sheets joined by a plurality of joints 40 and one or more filamentous elastic members, the plurality of joints are spaced apart in the expansion and contraction direction of the filamentous elastic member, the filamentous elastic member is fixed at the plurality of joints, the expandable sheet has a predetermined cut mark 50A indicating the position where the filamentous elastic member is cut, a first adjacent cut mark 50B adjacent to the predetermined cut mark from one side in the expansion and contraction direction, and a second adjacent cut mark 50C adjacent to the predetermined cut mark from the other side in the expansion and contraction direction, and joints for fixing the filamentous elastic member are provided between the first adjacent cut mark and the predetermined cut mark, and between the second adjacent cut mark and the predetermined cut mark.

Description

Technical Field

[0001] The present invention relates to an article provided with a stretchable sheet.

Background Art

[0002] In Patent Document 1, as a method for forming a stretchable portion in an absorbent article, an elastic stretchable member is sandwiched between an inner sheet and an outer sheet, and in a state where a tensile force is applied to the elastic stretchable member, in the vicinity of both sides in the diameter direction of the elastic stretchable member, a method of intermittently welding in the sheet supply direction (the stretching direction of the elastic stretchable member) is disclosed. Thereby, in the cross-sectional space closed by the welded portion between the inner sheet and the outer sheet, the cross-sectional outer shape of the elastic stretchable member after releasing the tensile force expands, and the elastic stretchable member is fixed to the sheet. In addition, in absorbent articles such as pant-type disposable diapers, the fitting property is improved by providing the waist member that covers the wearer's waist with elasticity. However, if the stretchability of the portion of the waist member that overlaps the absorber is high, there is a risk that the absorber will leak from the wrinkles that have shrunk in the width direction. Therefore, a method of reducing the stretching force by finely cutting the elastic stretchable member is adopted in the portion of the waist member that overlaps the absorber.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an elastic stretch member is fixed at a welded joint as in Patent Document 1, the amount of adhesive applied to the elastic stretch member and sheet can be reduced, and the decrease in flexibility of the stretched part due to the hardening of the adhesive can be suppressed. However, if a method is adopted in which the elastic stretch member is finely cut in order to reduce the stretching force in a part of the stretched part (stretchable sheet) in Patent Document 1, there is a risk that the elastic stretch member may fall off and be mixed into the product as foreign matter.

[0005] The present invention has been made in view of the above-mentioned problems, and aims to reduce the stretching force on a portion of a stretchable sheet in which filamentous elastic members are intermittently fixed in the stretching direction, while suppressing the detachment of cut filamentous elastic members. [Means for solving the problem]

[0006] The main invention for achieving the above objective is: An article comprising an expandable sheet, The stretchable sheet comprises a pair of sheets joined at multiple joints, and one or more thread-like elastic members provided between the pair of sheets. The multiple joints are arranged at intervals in the direction of expansion and contraction of the filamentous elastic member. The filamentous elastic member is fixed between the pair of sheets at a plurality of joints. The stretchable sheet has a plurality of cut marks indicating the positions where the filamentous elastic member was cut. The plurality of cut marks include a predetermined cut mark, a first adjacent cut mark adjacent to the predetermined cut mark from one side in the expansion / contraction direction, and a second adjacent cut mark adjacent to the predetermined cut mark from the other side in the expansion / contraction direction. The first adjacent cut mark and the second adjacent cut mark overlap with more than half of the predetermined cut mark in a direction perpendicular to the expansion and contraction direction. The article comprises an expandable sheet characterized in that the joints for fixing the thread-like elastic member are provided between the first adjacent cut mark and the predetermined cut mark, and between the second adjacent cut mark and the predetermined cut mark. Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0007] According to the present invention, in an expandable sheet in which filamentous elastic members are intermittently fixed in the expansion and contraction direction, it is possible to reduce the expansion and contraction force in a portion of the sheet while suppressing the detachment of cut filamentous elastic members. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic front view of a disposable pull-up diaper 1. [Figure 2] This is a schematic plan view of diaper 1 in its unfolded and extended state, as seen from the non-skin side. [Figure 3] Figure 2 is a schematic cross-sectional view along the CC line. [Figure 4] This is an explanatory diagram of the arrangement pattern of the welded parts 40. [Figure 5] Figures 5A and 5B are explanatory diagrams illustrating the method of fixing the elastic members 24 and 25 around the torso. [Figure 6] This is an explanatory diagram of the ventral low-stretch region RL. [Figure 7] This is a magnified view of a portion of the ventral low-stretch region RL. [Figure 8] This is a magnified view of a portion of the ventral low-stretch region RL. [Figure 9] This figure shows a modified example of the arrangement pattern of the welded portion 40. [Figure 10] Figures 10A and 10B are explanatory diagrams of the ends of the elastic members 24 and 25 around the body that have been cut by the cutting marks 50 and 50'. [Figure 11] This is an explanatory diagram of the joint 60 of the second embodiment. [Modes for carrying out the invention]

[0009] The following matters become clear from this specification and the accompanying drawings: (Aspect 1) An article comprising a stretchable sheet, wherein the stretchable sheet includes a pair of sheets joined at a plurality of joints and one or more filamentary elastic members provided between the pair of sheets; the plurality of joints are arranged at intervals in the stretching direction of the filamentary elastic members; the filamentary elastic members are fixed between the pair of sheets at the plurality of joints; the stretchable sheet includes a plurality of cut marks indicating positions where the filamentary elastic members are cut; the plurality of cut marks include a predetermined cut mark, a first adjacent cut mark adjacent to the predetermined cut mark from one side in the stretching direction, and a second adjacent cut mark adjacent to the predetermined cut mark from the other side in the stretching direction; the first adjacent cut mark and the second adjacent cut mark overlap with at least half of the portion of the predetermined cut mark in a direction orthogonal to the stretching direction; and joints for fixing the filamentary elastic members are provided between the first adjacent cut mark and the predetermined cut mark and between the second adjacent cut mark and the predetermined cut mark. An article comprising a stretchable sheet, characterized by the above.

[0010] According to Aspect 1, since the cut pieces of the torso elastic member cut at the positions of the first adjacent cut mark and the predetermined cut mark and the cut pieces of the filamentary elastic member cut at the positions of the second adjacent cut mark and the predetermined cut mark are fixed at the joints, it is possible to prevent them from falling out between the pair of sheets. Therefore, it is possible to prevent the cut pieces of the filamentary elastic member from mixing into the interior of the article as foreign matter.

[0011] (Aspect 2) An article comprising the stretchable sheet according to Aspect 1, one or more cut mark rows in which the plurality of cut marks are arranged in the stretching direction are formed; in the cut mark rows, at least half of the portions of the plurality of cut marks overlap with each other in the orthogonal direction; and in a first cut mark row among the one or more cut mark rows, joints for fixing the filamentary elastic members are provided at all positions between two adjacent cut marks in the stretching direction.

[0012] According to Aspect 2, all cut pieces of the filamentous elastic member cut at the positions of the plurality of cut marks constituting the first cut mark series are fixed at the joining part. Therefore, the falling off of more cut pieces of the filamentous elastic member is suppressed, and the entry of foreign matter into the interior of the article can be further suppressed.

[0013] (Aspect 3) An article provided with the stretchable sheet according to Aspect 2, In each of all the cut mark series, at all positions between two adjacent cut marks in the stretching direction, the joining part for fixing the filamentous elastic member is provided.

[0014] According to Aspect 3, in all the cut mark series, all cut pieces of the filamentous elastic member cut at the positions of the plurality of cut marks constituting each cut mark series are fixed at the joining part. Therefore, the falling off of more cut pieces of the filamentous elastic member is suppressed, and the entry of foreign matter into the interior of the article can be further suppressed.

[0015] (Aspect 4) An article provided with the stretchable sheet according to any one of Aspects 1 to ③, A plurality of joining parts for fixing the filamentous elastic member are provided between the first adjacent cut mark and the predetermined cut mark.

[0016] According to Aspect 4, the cut pieces of the torso elastic member cut at the positions of the first adjacent cut mark and the predetermined cut mark are firmly fixed in position between the pair of sheets and are difficult to fall off. Therefore, the entry of foreign matter into the interior of the article can be further suppressed.

[0017] (Aspect 5) An article provided with the stretchable sheet according to Aspect 4, In the direction perpendicular thereto, in a region on one side of the first adjacent cut mark and the predetermined cut mark, and in a region overlapping with the range from the other end of the first adjacent cut mark to the one end of the predetermined cut mark in the stretching direction, the cut mark is provided.

[0018] According to embodiment 5, a small stretching force is generated in the cut piece of the filamentous elastic member between the first adjacent cut mark and the predetermined cut mark, but the filamentous elastic member adjacent to that cut piece in a direction perpendicular to it is cut. As a result, the stretching force in a part of the stretchable sheet (the aforementioned range) can be reduced, and the generation of stress differences with adjacent areas can be suppressed.

[0019] (Aspect 6) An article comprising an elastic sheet as described in any of aspects 1 to 5, The number of intervals between two adjacent cut marks in the expansion and contraction direction, where more than half of the two cut marks overlap each other in the orthogonal direction, and where multiple joints for fixing the filamentous elastic member are provided between the intervals, is less than the number of intervals where one joint for fixing the filamentous elastic member is provided between the intervals.

[0020] According to embodiment 6, the number of cut pieces of the filamentous elastic member that are fixed at multiple joints and exhibit small stretching forces is reduced. Therefore, the stretching force of a portion of the stretchable sheet can be reduced.

[0021] (Aspect 7) An article comprising the stretchable sheet described in Aspect 6, The number of spaces between which multiple joints for fixing the filamentous elastic member are provided is less than or equal to half the number of spaces between which one joint for fixing the filamentous elastic member is provided.

[0022] According to embodiment 7, the number of cut pieces of the filamentous elastic member that are fixed at multiple joints and exhibit small stretching forces is reduced. Therefore, the stretching force of a portion of the stretchable sheet can be reduced.

[0023] (Aspect 8) An article comprising an elastic sheet as described in any of aspects 1 to 5, The number of intervals between two adjacent cut marks in the direction of expansion and contraction, where more than half of the two cut marks overlap each other in the orthogonal direction, and where multiple joints for fixing the filamentous elastic member are provided between these intervals, is greater than the number of intervals where one joint for fixing the filamentous elastic member is provided between these intervals.

[0024] According to embodiment 8, the number of cut pieces of the filamentous elastic member, which are fixed at multiple joints and are less likely to fall out between the pair of sheets, increases. Therefore, the intrusion of foreign matter into the inside of the article can be further suppressed.

[0025] (Aspect 9) An article comprising an elastic sheet as described in any of aspects 1 to 8, The aforementioned cut marks are inclined with respect to the perpendicular direction.

[0026] According to embodiment 9, the ends of the cut pieces of the filamentous elastic member tend to thicken after cutting, allowing them to be firmly fixed at the joint and making it difficult for them to fall out between the pair of sheets. For example, if the joint consists of two welded parts (a pair of welded parts) spaced apart in orthogonal directions, the filamentous elastic member will be less likely to come out from between them. If the joint is an adhesive or welded part that overlaps with the filamentous elastic member, the contact area between the side edge of the joint in the expansion and contraction direction and the end of the cut piece of the filamentous elastic member increases, making it more difficult for the filamentous elastic member to come out of the joint. As a result, the intrusion of foreign matter into the interior of the article can be further suppressed.

[0027] (Aspect 10) An article comprising an elastic sheet as described in any of aspects 1 to 9, The joint is a welding portion that welds the pair of sheets together, and the filamentous elastic member is fixed between the pair of sheets by being sandwiched between the two welding portions located on both sides of the filamentous elastic member in the orthogonal direction.

[0028] According to embodiment 10, adhesive can be omitted or reduced in amount between the elastic member around the body and between the pair of sheets. Therefore, the decrease in flexibility of the stretchable sheet and the decrease in elastic properties of the filamentous elastic member due to the hardening of the adhesive can be suppressed. On the other hand, since the cut pieces of the filamentous elastic member are more likely to fall off, the joints (welded parts) between the first adjacent cut mark and the predetermined cut mark, and between the second adjacent cut mark and the predetermined cut mark function effectively.

[0029] (Aspect 11) An article comprising the stretchable sheet described in Aspect 10, Multiple pairs of welded portions, which sandwich the filamentous elastic member cut at the location of the cut mark, are arranged in the orthogonal directions, and one or more welded portions are provided between the multiple pairs of welded portions in the orthogonal directions.

[0030] According to embodiment 11, the rigidity of the pair of sheets in the left-right direction is increased by one or more welded parts other than the pair of welded parts. Therefore, contraction of the stretchable sheet in the left-right direction can be suppressed.

[0031] (Aspect 12) An article comprising an elastic sheet as described in any of aspects 1 to 11, Multiple rows of cut marks are formed in which multiple cut marks are arranged in the direction of expansion and contraction, and in the rows of cut marks, more than half of the portions of the multiple cut marks overlap each other in the orthogonal direction, and the expandable sheet has a first region in which multiple cut marks are provided and a second region in which no cut marks are provided, the second region is adjacent to the first region in the direction of expansion and contraction and overlaps with the first region in the orthogonal direction, and the number of filamentous elastic members arranged in the orthogonal direction in the second region is equal to the number of rows of cut marks arranged in the orthogonal direction in the first region.

[0032] According to embodiment 12, a single filamentous elastic member is cut at the position of a single row of cut marks, and the length of the cut piece of the filamentous elastic member is appropriately secured. The cut piece of the filamentous elastic member, which is of an appropriate length, is easily fixed at the joint and is less likely to fall out between the pair of sheets. Therefore, the contamination of the article with foreign matter can be further suppressed.

[0033] ===Implementation Method=== Hereinafter, the "article equipped with an elastic sheet" according to the present invention will be described using a pant-type disposable diaper (hereinafter also referred to as "diaper 1") as an example. However, the article equipped with an elastic sheet according to the present invention may be other absorbent articles such as tape-type disposable diapers, sanitary shorts, or absorbent pads. Furthermore, any article equipped with an elastic sheet may be an article other than an absorbent article (for example, cleaning tools or masks).

[0034] <<Basic composition of diaper 1>> Figure 1 is a schematic front view of a pant-type disposable diaper 1. Figure 2 is a schematic plan view of the unfolded and stretched diaper 1 as seen from the non-skin side. Figure 3 is a schematic cross-sectional view along line CC of Figure 2. Here, the "unfolded state" of the diaper 1 refers to the state in which the waist joint 2, described later, is released, and the folds of the diaper 1 are opened longitudinally and unfolded planarly. The "stretched state" of the diaper 1 refers to the state in which the entire diaper 1 is stretched without wrinkles by stretching each elastic member of the diaper 1 (for example, waist elastic members 24, 25, etc., described later), specifically, the state in which the dimensions of each material constituting the diaper 1 (for example, the outer layer sheet 21 and the inner layer sheet 22, etc.) are stretched to match or close to the dimensions of the individual member.

[0035] Diaper 1, in the pant-type state shown in Figure 1, has intersecting vertical, horizontal, and front-to-back directions, and has a waist opening BH and a pair of leg openings LH. In the unfolded state shown in Figure 2, it has intersecting longitudinal, horizontal, and thickness directions. The longitudinal direction is along the vertical direction in the pant-type state. The thickness direction is the direction in which the components constituting diaper 1 are stacked. In the vertical direction, the waist opening BH side is considered the upper side, and the crotch side is considered the lower side. In the front-to-back direction, the side facing the wearer's abdomen is considered the front side, and the side facing the wearer's back is considered the back side. In the thickness direction, the side that comes into contact with the wearer's body (skin) is considered the skin side, and the opposite side is considered the non-skin side.

[0036] Furthermore, as shown in Figure 3, the diaper 1 has an outer casing member 20 and an absorbent body 10 joined to the skin side of the outer casing member 20. Cover sheets 31 and 32 may be provided to cover both ends of the absorbent body 10 in the longitudinal direction from the skin side.

[0037] The unfolded diaper 1 is folded in half at the longitudinal center position CL, and the ventral and dorsal waist sections of the outer material 20 are joined in a ring shape by a pair of waist joints 2, resulting in the pant-type diaper 1 shown in Figure 1. Examples of methods for joining the waist joints 2 include welding and adhesive bonding.

[0038] The absorbent body 10, although not shown in the figure, can be exemplified by having an absorbent core 11 that absorbs excretory fluid, a liquid-permeable top sheet (e.g., nonwoven fabric) provided on the skin side in the thickness direction relative to the absorbent core 11, and a liquid-impermeable back sheet (e.g., resin film) provided on the non-skin side in the thickness direction relative to the absorbent core.

[0039] The exterior member 20 is a sheet member having a shape in which the central part in the longitudinal direction is constricted inward in the left-right direction. As shown in Figure 3, the exterior member 20 has a ventral outer layer sheet 21F, a dorsal outer layer sheet 21B, an inner layer sheet 22, and a plurality of girth elastic members 24, 25. Hereafter, the ventral outer layer sheet 21F and the dorsal outer layer sheet 21B will be collectively referred to as the outer layer sheet 21.

[0040] Examples of the outer layer sheet 21 and the inner layer sheet 22 include flexible sheet materials such as nonwoven fabric. The constituent fibers of the nonwoven fabric include heat-fusible fibers, and examples include single fibers of thermoplastic resins (such as polypropylene (PP) and polyethylene (PE)) or composite fibers having a sheath-core structure such as PE and PP. The inner layer sheet 22 forms the outer shape of the outer material 20 and is a sheet material that is continuous in the longitudinal direction from the ventral side to the dorsal side. The ventral outer layer sheet 21F is on the non-skin side than the inner layer sheet 22 and has the same longitudinal length as the waist joint 2. The dorsal outer layer sheet 21B is on the non-skin side than the inner layer sheet 22 and extends below the crotch from the waist joint 2. In the unfolded state of the diaper 1, the ventral outer layer sheet 21F and the dorsal outer layer sheet 21B are separated in the longitudinal direction, and the inner layer sheet 22 is exposed to the outside as the non-skin side of the diaper 1 between them.

[0041] The waist elastic members 24 and 25 are thread-like elastic members (such as elastic thread) that stretch in the left-right direction. Multiple waist elastic members 24 and 25 are arranged in a vertical direction in a pant-type state between the outer layer sheet 21 and the inner layer sheet 22, and are fixed in an extended state along the left-right direction. As a result, the outer material 20 fits the wearer's waist and buttocks. The basic configuration of the diaper 1 of this embodiment has been described above, but the configuration of a disposable diaper (absorbent article) equipped with an elastic sheet is not limited to the above.

[0042] <<Joint portion of the first embodiment>> Figure 4 is an explanatory diagram of the arrangement pattern of the welded parts 40 and is a schematic plan view of the diaper 1 in its unfolded and extended state. To avoid complexity in the drawing, the waist elastic members 24 and 25 are omitted in Figure 4. Figures 5A and 5B are explanatory diagrams of the method for fixing the waist elastic members 24 and 25.

[0043] The exterior member 20 (stretchable sheet) comprises a pair of sheets (ventral outer layer sheet 21F and inner layer sheet 22, or dorsal outer layer sheet 21B and inner layer sheet 22) joined by a plurality of welded joints 40 (joints), and a plurality of girth elastic members 24, 25 (thread-like elastic members) provided between the pair of sheets. The plurality of welded joints 40 are arranged with spacing in the left-right direction (the direction of stretching and contracting of the thread-like elastic members). Specifically, as shown in Figure 4, a plurality of rows of welded joints 42, in which the plurality of welded joints 40 are arranged with spacing in the vertical direction, are arranged with spacing in the left-right direction. In the following description, the outer layer sheet 21 and the inner layer sheet 22 are collectively referred to as a pair of sheets 21, 22.

[0044] The method for forming the welded portion 40 can be exemplified by well-known welding methods such as ultrasonic welding or heat welding. In this embodiment, the shape of the welded portion 40 is a parallelogram, and each row of welded portions 42 is slightly meandering in the left-right direction. However, in Figures 5A and 5B, for the sake of simplifying the drawings, the shape of the welded portion 40 is made rectangular, and the left-right positions of two adjacent welded portions 40 in the vertical direction are made the same.

[0045] The multiple welded portions 40 have multiple pairs of welded portions 41 located on both sides of the filamentous elastic member in a direction perpendicular to the stretching and contracting direction of the waist elastic members 24, 25 (left-right direction of the diaper 1) (up-down direction of the diaper 1). As shown in Figure 5A, the two welded portions 40, 40 constituting the pair of welded portions 41 are arranged with a gap GH40 in the vertical direction. The size of this gap GH40 is set to be the same size as or slightly larger than the outer diameter d1 of the waist elastic members 24, 25 when the outer material member 20 is fully extended in the left-right direction (GH40≧d1).

[0046] The circumferential elastic members 24 and 25 become thicker as they contract in the left - right direction. Therefore, as shown in FIG. 5B, the distance GH40 between the pair of welding parts 41 is made smaller than the maximum outer diameter d2 of the circumferential elastic members 24 and 25 in the state where the circumferential elastic members 24 and 25 are contracted in the left - right direction (that is, the natural state of the exterior member 20) (GH40 < d2). By doing so, the circumferential elastic members 24 and 25 in the state of being contracted in the left - right direction are sandwiched between the pair of welding parts 41 (the expansion in the up - down direction is restricted). That is, the circumferential elastic members 24 and 25 are restricted in their positions (movement in the left - right and up - down directions) with respect to the pair of sheets 21 and 22 at the plurality of welding parts 40 (between the pair of welding parts 41) and are fixed between the pair of sheets 21 and 22.

[0047] Therefore, the circumferential elastic members 24 and 25 can be attached to the pair of sheets 22 and 23 without using an adhesive or by reducing the amount of adhesive used, and elasticity can be imparted to the exterior member 20. Thus, it is possible to suppress a decrease in the flexibility of the exterior member 20 due to the curing of the adhesive and a decrease in the elastic characteristics of the circumferential elastic members twenty - four and twenty - five.

[0048] Also, the relationship between the distance GH40 between the pair of welding parts 41 and the outer diameters d1 and d2 of the circumferential elastic members 24 and 25 is not limited to the above. For example, a part of the circumferential elastic members 24 and 25 may overlap with the welding parts 40 so that the circumferential elastic members 24 and 25 do not break. Also in this case, the circumferential elastic members 24 and 25 are sandwiched between the pair of welding parts 41 in the state of being contracted in the left - right direction, and their positions with respect to the pair of sheets 21 and 2 are restricted.

[0049] In this embodiment, as shown in Figure 6, a row of welded portions 42 is illustrated in which the welded portions 40 meander in the left-right direction and extend in the vertical direction. However, the arrangement pattern of the welded portions 40 is not particularly limited. For example, a pattern in which multiple rows of welded portions, each arranged linearly along the vertical direction, are arranged in the left-right direction may also be used. Alternatively, a pattern in which multiple welded portions 40 are arranged vertically in each vertical region where the body elastic members 24 and 25 are located may also be used. That is, a pattern in which rows of welded portions with short vertical lengths are arranged with gaps in the vertical direction may also be used. Furthermore, it is not limited to the case that all body elastic members 24 and 25 arranged on the exterior member 20 are sandwiched and fixed by the pair of welded portions 41. Some of the body elastic members 24 and 25 may be fixed by joints other than the pair of welded portions 41 (for example, adhesive).

[0050] <<Regarding the Low-Stretch Area (RL)>> Figure 6 is an explanatory diagram of the ventral low-stretch region RL. Figures 7 and 8 are enlarged views of a part of the ventral low-stretch region RL. The outer material 20 (stretchable sheet) of the diaper 1 has multiple "cut marks 50" indicating the positions where the waist elastic members 24, 25 (thread-like elastic members) were cut by a cutter, heat, etc., during the manufacturing process of the diaper 1.

[0051] Furthermore, as shown in Figures 2 and 4, the exterior member 20 has a "low stretch region RL" where the stretching force in the left-right direction is reduced, and a "high stretch region RH" where the stretching force in the left-right direction is higher than in the low stretch region RL. No cut marks 50 are provided in the high stretch region RH, and in the high stretch region RH, each waist elastic member 24, 25 is continuous in the left-right direction. Multiple cut marks 50 are provided in the low stretch region RL. In the low stretch region RL, each waist elastic member 24, 25 is intermittently cut at the positions of multiple cut marks 50 aligned in the left-right direction. Therefore, in the low stretch region RL, the stretching force of the waist elastic members 24, 25 is less likely to occur compared to the high stretch region RH, and the stretching force in the left-right direction is reduced.

[0052] When the diaper 1 is unfolded and stretched, viewed in the thickness direction (Figures 2 and 4), the low-stretch region RL overlaps with the absorbent core 11. In the region of the outer material 20 that overlaps with the absorbent core 11, the stretching force in the left-right direction is reduced, thereby suppressing the contraction of the absorbent core 11. Therefore, leakage of excrement from the gap created between the wrinkles caused by the contraction of the absorbent core 11 and the wearer can be suppressed. In addition, discomfort caused by wrinkles in the absorbent core 11 can be reduced.

[0053] Specifically, the outer casing member 20 has a low-stretch region RL that overlaps with the ventral end of the absorbent core 11 in the longitudinal direction, and a low-stretch region RL that overlaps with the dorsal end of the absorbent core 11. The ventral low-stretch region RL is a region in which the three girth elastic members 24a, 24b, and 24c from the bottom are intermittently cut at positions where they overlap with the absorbent core 11. The dorsal low-stretch region RL is a region in which the three girth elastic members 25a, 25b, and 25c from the bottom are intermittently cut at positions where they overlap with the absorbent core 11. The following explanation will use the ventral outer casing member 20 as an example to describe the cut marks 50, etc., but it is preferable that the dorsal outer casing member 20 has a similar configuration.

[0054] In this embodiment, the example given is that the waist elastic members 24 and 25 that expand and contract along the left-right direction between a pair of waist joints 2 are cut. However, the position, direction of expansion and contraction, number, etc., of the elastic members to be cut are not particularly limited. For example, the waist elastic members 24 and 25 located on the lower side (crotch side) of the outer material 20 are not limited to being cut; waist elastic members 24 and 25 located in the central or upper part of the outer material 20 in the vertical direction may also be cut. Furthermore, this embodiment can also be applied when elastic members located in the crotch area of ​​the diaper 1 or elastic members arranged to follow the wearer's legs (i.e., elastic members having a portion that slopes downward from the waist joint 2 toward the central part in the left-right direction, and a portion that crosses the absorbent body 10 in the left-right direction) are cut. In addition, the number of waist elastic members 24 and 25 to be cut may differ between the ventral and dorsal sides.

[0055] As shown in Figure 7, the multiple cut marks 50 include a predetermined cut mark 50A, a first adjacent cut mark 50B adjacent to the predetermined cut mark 50A from one side in the left-right direction of the diaper 1 (the direction of expansion and contraction of the waist elastic member 24), and a second adjacent cut mark 50C adjacent to the predetermined cut mark 50A from the other side in the left-right direction.

[0056] Furthermore, the first adjacent cut mark 50B and the second adjacent cut mark 50C overlap with more than half of the predetermined cut mark 50A in the vertical direction (a direction perpendicular to the stretching direction). In Figure 7, the upper ends of the predetermined cut mark 50A, the first adjacent cut mark 50B, and the second adjacent cut mark 50C coincide, and their lower ends also coincide, so the first adjacent cut mark 50B and the second adjacent cut mark 50C overlap with the entire predetermined cut mark 50A in the vertical direction. In other words, the predetermined cut mark 50A, the first adjacent cut mark 50B, and the second adjacent cut mark 50C are cut marks 50 made by cutting the same waist elastic member 24c that was continuous in the left-right direction in Figure 7. The overlapping length of the multiple cut marks 50 can be confirmed when the diaper 1 is stretched.

[0057] In Figure 7, the cut mark 50D located above and to one side of the predetermined cut mark 50A overlaps with the predetermined cut mark 50A in less than half the length of the predetermined cut mark 50A in the vertical direction. In other words, the length L2 over which the cut mark 50D and the predetermined cut mark 50A overlap in the vertical direction is shorter than half the length L1 of the predetermined cut mark 50A in the vertical direction. Therefore, the cut mark 50D does not correspond to the first adjacent cut mark. In the following explanation, "two cut marks 50 adjacent in the horizontal direction" refers to cut marks 50 that overlap with each other in the vertical direction by more than half the length of the two cut marks 50 (over a length of L1 / 2 or more) and that cut the same girdle elastic members 24, 25.

[0058] Furthermore, a row of welded parts 42 is located between the first adjacent cut mark 50B and a predetermined cut mark 50A, and between the second adjacent cut mark 50C and a predetermined cut mark 50A, and a pair of welded parts 41 (joints for fixing the thread-like elastic member) that sandwich the body elastic member 24 are provided. The "space" between two adjacent cut marks 50 in the left-right direction is the region enclosed by an imaginary line connecting the upper end of one cut mark 50 in the left-right direction to the upper end of the other cut mark, an imaginary line connecting the lower end of one cut mark 50 in the left-right direction to the lower end of the other cut mark, and the cut mark 50 on one side and the other cut mark 50.

[0059] As described above, the cut pieces of the waist elastic member 24c, cut at the position of the first adjacent cut mark 50B and the position of the predetermined cut mark 50A, are held between the welded portion pair 41 and fixed between the pair of sheets 21 and 22. Similarly, the cut pieces of the waist elastic member 24c, cut at the position of the second adjacent cut mark 50C and the position of the predetermined cut mark 50A, are also held between the welded portion pair 41 and fixed between the pair of sheets 21 and 22. Therefore, it is possible to prevent the cut pieces of the waist elastic member 24c from falling out from between the pair of sheets 21 and 22. Thus, it is possible to prevent the cut pieces of the waist elastic member 24c from becoming foreign matter and getting mixed into the inside of the diaper 1.

[0060] In particular, the body elastic members 24 and 25 in this embodiment are fixed between a pair of sheets 21 and 22 by being sandwiched between two welded portions 40 (welded portion pair 41) located on both sides of the body elastic members 24 and 25 in the vertical direction. Therefore, it is possible to either not apply adhesive between the body elastic members 24 and 25 and the pair of sheets 21 and 22, or to reduce the amount of adhesive applied. Thus, it is possible to suppress the decrease in flexibility of the exterior member 20 and the decrease in elastic properties of the body elastic members 24 and 25 due to the hardening of the adhesive. On the other hand, the cut pieces of the body elastic members 24 and 25 that are cut at the position of the cut marks 50 tend to fall out easily. Therefore, as described above, the effect of positioning the welded portion pair 41 between two adjacent cut marks 50 in the left-right direction is effective.

[0061] Therefore, as shown in FIG. 8, it is preferable that the interval W40 between the two welding portions 40 (welding portion row 42) arranged in the left - right direction is narrower than the interval W50 between the two cutting marks 50 adjacent in the left - right direction (W40 < W50). The interval W40 is the length in the left - right direction from the other - side end of the welding portion 40 on one side in the left - right direction to the one - side end of the welding portion 40 on the other side in the extended state of the exterior member 20. The interval W50 is the length in the left - right direction from the vertical center of the cutting mark 50 (the other - side end) on one side in the left - right direction to the vertical center of the cutting mark 50 (the one - side end) on the other side in the extended state of the exterior member 20. Thereby, it becomes easier for the welding portion 40 (welding portion row 42) to be positioned between the two cutting marks 50 adjacent in the left - right direction, and it becomes easier for the cut body - circumferential elastic members 24, 25 to be sandwiched by the welding portion pair 41.

[0062] Although the length of the welding portion 40 of the present embodiment in the left - right direction is relatively short, the length of the welding portion in the left - right direction may be long, and the welding portion may be positioned across the cutting mark 50. In that case, the welding portion pair that sandwiches the cut pieces of the body - circumferential elastic members 24, 25 on one side of the cutting mark 50 and the welding portion pair that sandwiches the cut pieces of the body - circumferential elastic members 24, 25 on the other side of the cutting mark 50 may be the same long welding portion pair in the left - right direction.

[0063] Also, although a plurality of cutting marks 50 are provided on the exterior member 20 (stretchable sheet) of the diaper 1, at least one of the plurality of cutting marks 50 needs to correspond to the above - mentioned predetermined cutting mark 50. That is, at least one of the plurality of cutting marks 50 provided in the ventral low - stretch region RL and the plurality of cutting marks 50 provided in the dorsal low - stretch region RL needs to correspond to the predetermined cutting mark 50. However, it is more preferable as follows.

[0064] In the manufacturing process of the diaper 1, each of the body - circumferential elastic members 24, 25 is cut at the positions of the plurality of cutting marks 50. Therefore, as shown in FIGS. 4 and 6, on the diaper 1 (exterior member 20), one or more cutting mark rows 51 in which the plurality of cutting marks 50 are arranged in the stretching direction are formed. The plurality of cutting marks 50 constituting the cutting mark row 51 are the cutting marks that cut the same body - circumferential elastic members 24, 25.

[0065] In the cut mark row 51, more than half of the cut marks 50 overlap each other in the vertical direction. In other words, the cut marks 50 constituting the cut mark row 51 overlap each other over a length of more than half the vertical length of each cut mark 50 (for example, the length L1 shown in Figure 7). In the cut mark row 51 of this embodiment, the vertical positions of all the cut marks 50 constituting the cut mark row 51 are aligned. The ventral exterior member 20 (Figure 6) has three cut mark rows 51a to 51c arranged in the vertical direction, and the dorsal exterior member 20 (Figure 4) also has three cut mark rows 51 arranged in the vertical direction.

[0066] In one of the six rows of cut marks 51 formed in the exterior member 20 (the first row of cut marks), it is preferable that a pair of welded portions 41 (joints that fix the filamentous elastic members) that sandwich the girth elastic members 24, 25 are provided between all two adjacent cut marks 50 in the left-right direction. For example, as shown in Figure 6, the uppermost row of cut marks 51a in the ventral exterior member 20 consists of multiple cut marks 50a indicating the positions where one girth elastic member 24a was cut. In the row of cut marks 51a, a row of welded portions 42 is located between all two adjacent cut marks 50 in the left-right direction, and a pair of welded portions 41 is provided.

[0067] As a result, all the cut pieces of the waist elastic member 24a, which are cut at the positions of the multiple cut marks 50a constituting the row of cut marks 51a (first row of cut marks), are held between the welded portion pair 41 and fixed between the pair of sheets 21 and 22. Therefore, it is possible to prevent all the cut pieces of a single waist elastic member 24a from falling out between the pair of sheets 21 and 22. Thus, the contamination of diapers 1 with foreign matter can be further suppressed.

[0068] Preferably, in each of the six rows of cut marks 51 formed on the exterior member 20, a row of welded parts 42 is located between every two adjacent cut marks 50 in the left-right direction, and pairs of welded parts 41 (joints that fix the filamentous elastic members) that sandwich the body elastic members 24, 25 are provided.

[0069] As a result, in all rows of cut marks 51, all the cut pieces of the waist elastic members 24 and 25 that were cut at the positions of the multiple cut marks 50 constituting each row of cut marks 51 are held in place by the welded pair 41 and fixed between the pair of sheets 21 and 22. Therefore, the shedding of more cut pieces of the waist elastic members 24 and 25 is suppressed, and the contamination of the diaper 1 with foreign matter can be further suppressed.

[0070] Furthermore, it is sufficient if the above condition is met in the row of cut marks 51 of one of the stretchable sheets (outer material 20) provided by the diaper 1. For example, if the diaper 1 is provided with other stretchable sheets and a row of cut marks is formed on the other stretchable sheets, it is not necessary for a pair of welded parts 41 to be provided between two adjacent cut marks in that row of cut marks. However, it is preferable that a pair of welded parts 41 be provided between all the cut marks 50 provided by the diaper 1 and the cut marks 50 adjacent to them.

[0071] Furthermore, as shown in Figure 7, it is preferable that multiple rows of welded parts 42 are arranged between the first adjacent cut mark 50B and the predetermined cut mark 50A, and that multiple pairs of welded parts 41 (joints for fixing the filamentous elastic member) are provided. As a result, the cut pieces of the waist elastic member 24c cut at the positions of the first adjacent cut mark 50B and the predetermined cut mark 50A are sandwiched between multiple (two in Figure 7) pairs of welded parts 41. In this way, the cut pieces of the waist elastic member 24c sandwiched between multiple pairs of welded parts 41 are fixed more securely than the cut pieces of the waist elastic members 24 and 25 sandwiched between a single pair of welded parts 41, making it less likely for them to fall out between the pair of sheets 21 and 22. Therefore, it is possible to further suppress the inclusion of cut pieces of the waist elastic member 24c as foreign matter inside the diaper 1.

[0072] In the above case, it is preferable that, in the extended state of the exterior member 20, the cut mark 50D (see Figure 7) is provided in a region that, in the vertical direction, is on one side (upper or lower) of the first adjacent cut mark 50B and the predetermined cut mark 50A, and in the horizontal direction, overlaps with the range rAB (see Figure 8) from the other side (inner) end of the first adjacent cut mark 50B to the one side (inner) end of the predetermined cut mark 50A. This cut mark 50D is a cut mark 50 that cuts the circumferential elastic member 24b located above the circumferential elastic member 24c cut by the first adjacent cut mark 50B and the predetermined cut mark 50A.

[0073] The cut piece of the waist elastic member 24c, sandwiched between multiple welded pairs 41, is fixed in an extended state between the multiple welded pairs 41, exhibiting a small stretching force. According to the above, the waist elastic member 24b adjacent to the cut piece of the waist elastic member 24c in the vertical direction is cut in the range rAB that overlaps with the cut piece in the horizontal direction. Therefore, it is possible to suppress the occurrence of multiple cut pieces of waist elastic members 24 and 25, which exhibit a small stretching force, being lined up in the vertical direction. If, for example, multiple cut pieces of waist elastic members 24 and 25, which exhibit a small stretching force, are lined up in the vertical direction within a predetermined range (e.g., range rAB), and no stretching force is exhibited in the region adjacent to the predetermined range, a stress difference will occur, potentially causing deformation and wrinkles in the absorbent core, and resulting in discomfort when worn. Therefore, according to the above, the stretching force is more easily and uniformly reduced in the low stretching region RL, and the shrinkage of the absorbent core 11 can be suppressed.

[0074] Furthermore, in the space between two adjacent cut marks in the left-right direction, there may be waist elastic members 24, 25 on both the vertical and horizontal sides of the cut piece of the waist elastic member 24, 25 that is sandwiched between multiple welded pairs 41. In this case, by cutting the waist elastic members 24, 25 on both the vertical and horizontal sides, the difference in stretching force between a predetermined range (e.g., range rAB) and an adjacent range can be reduced in the low-stretch region RL, making it easier to uniformly reduce the stretching force in the low-stretch region RL.

[0075] Furthermore, the exterior member 20 of this embodiment has two adjacent cut marks 50 in the left-right direction, and multiple "spaces" between two cut marks 50 where more than half of the two cut marks 50 overlap each other in the up-down direction. In this case, as shown in Figure 6, the number of spaces S2 where multiple welded pairs 41 (joints for fixing the filamentous elastic member) are provided between two cut marks 50 is preferably less than the number of spaces S1 where one welded pair 41 is provided between two cut marks 50.

[0076] In this case, the number of cut pieces of the waist elastic members 24, 25 sandwiched between multiple welded pairs 41 is less than the number of cut pieces of the waist elastic members 24, 25 sandwiched between one welded pair 41. In other words, the number of cut pieces of the waist elastic member 24, which exhibits small stretching force, can be reduced. Therefore, the stretching force in the low stretching region RL can be reduced, and the shrinkage of the absorbent core 11 can be suppressed.

[0077] Furthermore, the number of intervals S2 in which multiple welded pairs 41 are provided between two adjacent cut marks 50 in the left-right direction is preferably less than half the number of intervals S1 in which one welded pair 41 is provided between two cut marks 50. This further reduces the number of cut pieces of the waist elastic member 24 that is sandwiched between multiple welded pairs 41 and exhibits small stretching force. Thus, the stretching force in the low stretching region RL can be reduced, and the shrinkage of the absorbent core 11 can be suppressed.

[0078] Figure 9 shows a modified example of the arrangement pattern of the welded parts 40. In Figure 9, the spacing W40' between adjacent welded parts 40 (rows of welded parts 42) in the left-right direction is narrower than the spacing W40 between the welded parts 40 (rows of welded parts 42) in Figure 6. Therefore, multiple rows of welded parts 42 can be arranged between two adjacent cut marks 50 in the left-right direction. In this way, the number of intervals S2 in which multiple welded pairs 41 are provided between two adjacent cut marks 50 in the left-right direction may be greater than the number of intervals S1 in which one welded pair 41 is provided between two cut marks 50.

[0079] A cut piece of the waist elastic member 24c, sandwiched between multiple welded pairs 41, is less likely to fall out from between the pair of sheets 21 and 22 than a cut piece of the waist elastic members 24 and 25, sandwiched between a single welded pair 41. Therefore, according to the above, a greater number of cut pieces of the waist elastic member 24c are less likely to fall out from between the pair of sheets 21 and 22. Thus, the inclusion of foreign matter into the diaper 1 can be further suppressed. However, the above is not limited to the above; the number of gaps S1 and the number of gaps S2 may be the same.

[0080] Figures 10A and 10B are explanatory diagrams of the ends of the elastic members 24 and 25 around the body, cut by the cut marks 50 and 50'. Figure 10A shows the cut mark 50 of this embodiment, and Figure 10B shows the cut mark 50' of a modified example. The cut mark 50' of the modified example is a cut mark 50' that is aligned in the vertical direction. In contrast, the cut mark 50 of this embodiment is inclined with respect to the vertical direction.

[0081] Therefore, the cross-sectional area (circumference) of the waist elastic members 24 and 25 cut diagonally as in this embodiment is larger than the cross-sectional area (circumference) of the waist elastic members 24 and 25 cut straight as in the modified example. As a result, the ends of the cut pieces of the waist elastic members 24 and 25 that have shrunk after cutting tend to become thicker, making it difficult for them to come loose from between the welded parts 41. Consequently, the cut pieces of the waist elastic members 24 and 25 are firmly fixed at the welded parts 41, making it difficult for them to fall out from between the pair of sheets 21 and 22. Thus, the ingress of foreign matter into the diaper 1 can be further suppressed. However, the invention is not limited to the above, and the cut marks on the outer material 20 may be the cut marks 50' of the modified example.

[0082] Also, in the extended state of the exterior member 20, as shown in FIG. 7, when the average value of the lengths in the left - right direction of a predetermined cut mark 50A, a first adjacent cut mark 50B, and a second adjacent cut mark 50C is defined as length L50ave, the following is preferable. The average value L40ave of the lengths in the left - right direction of two or more welding portions 40 that fix the circumferential elastic members 24 and 25 between the first adjacent cut mark 50B and the predetermined cut mark 50A is preferably shorter than the length L50ave. Similarly, the average value L40ave of the lengths in the left - right direction of two or more welding portions 40 that fix the circumferential elastic members 24 and 25 between the second adjacent cut mark 50C and the predetermined cut mark 50A is preferably shorter than the length L50ave (L40ave < L50ave). Thereby, it is possible to suppress the unnecessary increase in the length in the left - right direction of the welding portion 40, prevent the welding portion 40 from being conspicuous, and prevent the user from being given the impression that the exterior member 20 is a hard member. On the other hand, when the length in the left - right direction of the cut mark 40 is long, the probability of cutting on the welding portion 40 is high, the circumferential elastic members 24 and 25 are more easily and stably cut, and the shrinkage of the absorbent core 11 can be more reliably suppressed. Therefore, leakage of excrement from the gap between the wrinkles caused by the shrinkage of the absorbent core 11 and the wearer can be suppressed. Also, the discomfort due to the wrinkles of the absorbent core 11 can be reduced. Further, when the cut mark 50 is inclined with respect to the vertical direction, the larger the length L50ave is, the larger the inclination angle of the cut mark 50 becomes. Therefore, the ends of the cut pieces of the circumferential elastic members 24 and 25 that have shrunk after cutting become thicker, and it becomes difficult to escape from between the welding portion pairs 41.

[0083] Also, the welding portions 40 of the present embodiment are arranged at intervals in the vertical direction to form a welding portion row 42. Therefore, as shown in FIG. 7, a plurality of welding portion pairs 41 that sandwich the circumferential elastic member 24 cut at the position of the cut mark 50 are arranged in the vertical direction. And in the vertical direction, one or more welding portions 40 are provided between the plurality of welding portion pairs 41.

[0084] The rigidity of the pair of sheets 21 and 22 in the left-right direction is increased by one or more welded parts 40 other than the welded part 40 (welded part pair 41) that fixes the waist elastic members 24 and 25. As a result, contraction in the left-right direction of the low-stretch region RL can be suppressed, and contraction of the absorbent core 11 can be suppressed. In addition, in Figure 7, multiple welded parts 40 are arranged at predetermined intervals in the vertical direction. Therefore, even if vertical displacement occurs of the waist elastic members 24 and 25 during the manufacturing process of the diaper 1, the waist elastic members 24 and 25 are more likely to be held between any two of the multiple welded parts 40 arranged in the vertical direction. Thus, the detachment of cut waist elastic members 24 and 25 can be further suppressed.

[0085] As shown in Figure 2 (in the extended state of the exterior member 20), the exterior member 20 has a low-stretch region RL (first region) in which multiple cut marks 50 are provided, and an adjacent region R2 (second region) adjacent to the low-stretch region RL in the left-right direction and overlapping with the low-stretch region RL in the up-down direction. The adjacent region R2 is part of the high-stretch region RH and does not have cut marks 50. Therefore, in the adjacent region R2, multiple girdle elastic members 24, 25 are continuous in the left-right direction.

[0086] Before the waist elastic members 24 and 25 were cut at the location of the cut mark 50, the multiple waist elastic members 24 and 25 in the adjacent region R2 and the multiple waist elastic members 24 and 25 in the low-stretch region RL were continuous. In other words, the number of waist elastic members 24 and 25 in the adjacent region R2 corresponds to the number of waist elastic members 24 and 25 that were cut at the location of the cut mark 50. Therefore, it is preferable that the number of waist elastic members 24 and 25 arranged vertically in the adjacent region R2 is equal to the number of rows of cut marks 51 arranged vertically in the low-stretch region RL. Specifically, there are 3 waist elastic members 24a to 24c located in the ventral adjacent region R2. In this case, it is preferable that there are 3 rows of cut marks 51 in the ventral low-stretch region RL.

[0087] In the above case, during the manufacturing process of diaper 1, one waist elastic member 24, 25 is cut at the position of one row of cut marks 51 (one row of cutter blades). Therefore, compared to the case where the waist elastic members 24, 25 are cut at the positions of multiple rows of cut marks 51 (multiple rows of cutter blades) arranged in the vertical direction, the waist elastic members 24, 25 are not cut into too many small pieces, and the length of the cut pieces of the waist elastic members 24, 25 is appropriately maintained. The cut pieces of the waist elastic members 24, 25, which are of an appropriate length, are easily held in place by the welded pair 41 and are less likely to fall out from between the pair of sheets 21, 22. Thus, the contamination of diapers 1 with foreign matter can be further suppressed.

[0088] <<Joint portion 60 of the second embodiment>> Figure 11 is an explanatory diagram of the joint 60 of the second embodiment. The joint 60 of the second embodiment overlaps the body elastic members 24 and 25 in the thickness direction. Adhesive can be exemplified as such a joint 60. For example, the joint 60 is formed by applying adhesive between a pair of sheets 21 and 22 with gaps in the left-right direction, or by applying adhesive to the body elastic members 24 and 25 with gaps in the left-right direction. Figure 11 illustrates a pattern of joints 60 made of adhesive that extends continuously along the vertical direction and is applied with gaps in the left-right direction between a pair of sheets 21 and 22. The body elastic members 24 and 25 are intermittently bonded in the left-right direction to the inner surfaces of the pair of sheets 21 and 22 in an extended state, and are fixed between the pair of sheets 21 and 22 at multiple joints 60.

[0089] Alternatively, a welded portion can be exemplified as a joint 60 that overlaps with the waist elastic members 24 and 25 in the thickness direction. In other words, the pair of sheets 21 and 22 and the waist elastic members 24 and 25 may be welded together with sufficient strength so as not to cut the waist elastic members 24 and 25. The joint 60 is formed by intermittently welding the pair of sheets 21 and 22 and the waist elastic members 24 and 25 in the left-right direction. The welding method is not particularly limited, and ultrasonic welding, heat welding, etc., can be used.

[0090] The flexibility of the exterior member 20 can be improved by having joints 60 (adhesive or welded parts) that are spaced apart in the left-right direction, compared to the case where joints are continuously provided in the left-right direction. Note that the pattern of joints 60 illustrated in Figure 11 is just one example and is not limited thereto. For example, joints may extend inclined in the vertical direction, or joints may extend vertically while meandering in the left-right direction. Furthermore, the joints only need to be provided in a position that overlaps with the body elastic members 24 and 25 in the thickness direction, and may be arranged intermittently in the vertical direction.

[0091] In the second embodiment, when the torso elastic members 24 and 25 are intermittently cut in order to reduce the stretching force of a portion of the outer material 20 (stretchable sheet), it is preferable to have the same configuration as in the first embodiment. At a minimum, as shown in Figure 11, there should be a joint 60 (adhesive or welded portion) that overlaps with the torso elastic members 24 and 25 in the thickness direction and fixes them in place between the first adjacent cut mark 50B and a predetermined cut mark 50A, and between the second adjacent cut mark 50C and a predetermined cut mark 50A. This prevents the cut torso elastic members 24 and 25 from falling out and prevents them from becoming mixed in as foreign matter inside the diaper 1.

[0092] ===Other=== The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention may be modified and improved without departing from its spirit, and it goes without saying that equivalents thereof are included.

[0093] For example, in the embodiment described above, the pair of sheets 21 and 22 sandwiching the filamentous elastic member are two separate sheets (Figure 3), but the pair of sheets may be a single sheet folded over to form two layers. Furthermore, the joint (welded portion) is not limited to joining only the pair of sheets sandwiching the filamentous elastic member, but may also join three or more layers of sheets, including other sheets laminated on the pair of sheets.

[0094] Furthermore, in the above-described embodiment, the stretchable sheet (exterior member 20) is provided with a plurality of thread-like elastic members (waist elastic members 24, 25), but the stretchable sheet may have only one thread-like elastic member. [Explanation of symbols]

[0095] 1. Pant-type disposable diapers (items), 2. Joint around the torso, 10 Absorbent body, 11 Absorbent core, 20 Exterior components, 21 Outer layer sheet, 22 inner layer sheets, 24. Elastic member around the waist (thread-like elastic member), 25 Elastic member around the waist (thread-like elastic member), 31 cover sheet, 32 cover sheet, 40 Welded part (joint), 41 Welded part pair, 42 Weld row, 50 Cut marks, 50A Specified cut marks, 50B First adjacent cut mark, 50C Second adjacent cut mark, 51 Cut trace row, RL low elasticity area (first area), RH high elasticity area, R2 adjacent area (second area), 60 joints,

Claims

1. An article comprising an expandable sheet, The stretchable sheet comprises a pair of sheets joined at multiple joints, and one or more thread-like elastic members provided between the pair of sheets. The multiple joints are arranged at intervals in the direction of expansion and contraction of the filamentous elastic member. The filamentous elastic member is fixed between the pair of sheets at a plurality of joints. The stretchable sheet has a plurality of cut marks indicating the positions where the filamentous elastic member was cut. The plurality of cut marks include a predetermined cut mark, a first adjacent cut mark adjacent to the predetermined cut mark from one side in the expansion / contraction direction, and a second adjacent cut mark adjacent to the predetermined cut mark from the other side in the expansion / contraction direction. The first adjacent cut mark and the second adjacent cut mark overlap with more than half of the predetermined cut mark in a direction perpendicular to the expansion and contraction direction. An article comprising an expandable sheet, characterized in that the joint portion for fixing the thread-like elastic member is provided between the first adjacent cut mark and the predetermined cut mark, and between the second adjacent cut mark and the predetermined cut mark.

2. An article comprising the stretchable sheet described in claim 1, One or more rows of cut marks are formed in which multiple cut marks are aligned in the direction of expansion and contraction. In the aforementioned row of cut marks, more than half of the portions of the multiple cut marks overlap each other in the orthogonal direction. An article comprising an expandable sheet, characterized in that, in the first row of cut marks among one or more rows of cut marks, the joints for fixing the filamentous elastic member are provided in all of the spaces between two adjacent cut marks in the expansion and contraction direction.

3. An article comprising the stretchable sheet described in claim 2, An article comprising an expandable sheet, characterized in that, in each of the rows of cut marks, the joints for fixing the filamentous elastic member are provided between all two adjacent cut marks in the expansion and contraction direction.

4. An article comprising an expandable sheet as described in any one of claims 1 to 3, An article comprising an elastic sheet, characterized in that a plurality of joints for fixing the thread-like elastic member are provided between the first adjacent cut mark and the predetermined cut mark.

5. An article comprising the stretchable sheet described in claim 4, An article comprising an expandable sheet, characterized in that the cut marks are provided in a region that is on one side of the first adjacent cut mark and the predetermined cut mark in the orthogonal direction, and in a region that overlaps with the range from the other end of the first adjacent cut mark to the one end of the predetermined cut mark in the expansion direction.

6. An article comprising an expandable sheet as described in any one of claims 1 to 3, The cutting marks are adjacent to each other in the direction of expansion and contraction, and the system comprises multiple spaces between the two cutting marks where more than half of the two cutting marks overlap each other in the orthogonal direction. An article comprising an elastic sheet, characterized in that the number of spaces between which multiple joints for fixing the filamentous elastic member are provided is less than the number of spaces between which one joint for fixing the filamentous elastic member is provided.

7. An article comprising the stretchable sheet described in claim 6, An article comprising an elastic sheet, characterized in that the number of intervals between which multiple joints for fixing the filamentous elastic member are provided is less than or equal to half the number of intervals between which one joint for fixing the filamentous elastic member is provided.

8. An article comprising an expandable sheet as described in any one of claims 1 to 3, The cutting marks are adjacent to each other in the direction of expansion and contraction, and the system comprises multiple spaces between the two cutting marks where more than half of the two cutting marks overlap each other in the orthogonal direction. An article comprising an elastic sheet, characterized in that the number of intervals between which multiple joints for fixing the filamentous elastic member are provided is greater than the number of intervals between which one joint for fixing the filamentous elastic member is provided.

9. An article comprising an expandable sheet as described in any one of claims 1 to 3, An article comprising an expandable sheet characterized in that the cut marks are inclined with respect to the orthogonal directions.

10. An article comprising an expandable sheet as described in any one of claims 1 to 3, The aforementioned joint is a welding portion that welds the pair of sheets together. An article comprising an elastic sheet, characterized in that the filamentous elastic member is fixed between the pair of sheets by being sandwiched between two welded portions located on both sides of the filamentous elastic member in the orthogonal direction.

11. An article comprising the stretchable sheet described in claim 10, Multiple pairs of welded portions, which are the two welded portions that sandwich the filamentous elastic member cut at the position of the cut mark, are arranged in the orthogonal direction. An article comprising an expandable sheet, characterized in that one or more of the welded portions are provided between a plurality of pairs of welded portions in the aforementioned orthogonal direction.

12. An article comprising an expandable sheet as described in any one of claims 1 to 3, Multiple rows of cut marks are formed in which multiple cut marks are aligned in the direction of expansion and contraction. In the aforementioned row of cut marks, more than half of the portions of the multiple cut marks overlap each other in the orthogonal direction. The stretchable sheet has a first region in which a plurality of cut marks are provided, and a second region in which no cut marks are provided. The second region is adjacent to the first region in the expansion / contraction direction and overlaps with the first region in the orthogonal direction. An article comprising an elastic sheet characterized in that the number of filamentous elastic members arranged in the orthogonal directions in the second region is equal to the number of rows of cut marks arranged in the orthogonal directions in the first region.

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