Absorbent panty-type items

Abstract

To provide a stretchable sheet and underpants-type absorbent article which have flexibility and easily produce an impression of a soft fit.SOLUTION: The invention provides a stretchable sheet (40) in which multiple elastic members (23) are arranged between a pair of sheets (21, 22) joined by multiple welded parts (50), where: a first welded part row (Ra1) has a first projecting section (51) and a second projecting section (52) that are convex toward one side in the left-right direction; a second welded part row (Ra2) has a third projecting section (53) that is convex toward the other side in the left-right direction; and, in the stretched state, at least a portion of a welded part (503) that is farthest on the other side in the left-right direction in the third projecting section (53) is positioned on the other side in the left-right direction with respect to a line (La) that connects the left-right-direction other-side ends of welded parts (501, 502) that are farthest on the one side in the left-right direction in the first projecting section (51) and the second projecting section (52).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an elastic sheet and a pants-type absorbent article. [Background Art]

[0002] In elastic sheets used in pants-type absorbent articles and the like, it is widely practiced that an elastic member is joined to a sheet material in a stretched state, and the elastic member is contracted to form gathers in the sheet material. Patent Document 1 aims to form folds (gathers) continuously extending along a direction orthogonal to the expansion and contraction direction of the elastic member in the elastic sheet. To this end, two sheet materials sandwiching the elastic member are partially joined by heat-sealed portions arranged in a staggered pattern or heat-sealed portions forming rows along the direction orthogonal to the expansion and contraction direction. [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2007-14802 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, as in Patent Document 1, when a plurality of heat-sealed portions are arranged linearly along the direction orthogonal to the expansion and contraction direction, the rigidity of the elastic sheet in that orthogonal direction increases, which may reduce the flexibility of the sheet. In addition, a user viewing an elastic sheet having folds continuously extending along the direction orthogonal to the expansion and contraction direction may have an impression that the elastic sheet has strong elasticity and gives a strong tightening feeling.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide [a product that has flexibility and gives an impression of soft and comfortable fit] Easily obtainable panty-type absorbent products . [Means for Solving the Problem]

[0006] The main invention for achieving the above objective is: It has intersecting vertical and horizontal directions, It has an absorbent body and a pair of waistband sections. A pant-type absorbent article having an elastic sheet provided on at least one of the pair of waist portions. And, The aforementioned stretchable sheet is oriented in the left-right direction, In the aforementioned stretchable sheet, Multiple elastic members, which are expandable and contractible in the left-right direction, are arranged between a pair of sheets joined by multiple welded joints, with spacing between them in the vertical direction. It is done, Each of the elastic members, when contracted in the left-right direction, is sandwiched between two adjacent welded portions in the vertical direction, thereby restricting its position in the left-right direction relative to the pair of sheets. The system has multiple rows of welded portions arranged in the vertical direction, The plurality of welding rows comprises a first welding row and a second welding row located adjacent to one side of the first welding row in the left-right direction, The first row of welded portions is convex to one side in the left-right direction and has adjacent first and second convex portions in the vertical direction. The second row of welded portions has a third convex portion that is convex to the other side in the left-right direction, In the state in which it is extended in the left-right direction, At least a portion of the welded portion located on the far other side in the left-right direction at the third protrusion is located on the far other side in the left-right direction, relative to the line connecting the ends of the welded portion located on the far one side in the left-right direction at each of the first and second protrusions. It is located, The stretchable sheet comprises a first welding region having a plurality of combinations of the first welding row and the second welding row that are adjacent to each other in the left-right direction. , The stretchable sheet has a second welding region, In the second welding region, a plurality of rows of fourth welding portions, each having convex portions that alternately protrude on one side and the other side in the left-right direction, are arranged in the left-right direction. When the stretchable sheet is extended in the left-right direction, The fourth row of welding portions adjacent to each other in the left-right direction does not overlap in the left-right direction, or the length of the overlap in the left-right direction is less than or equal to the length in the left-right direction of the welding portion located on the side of the convex portion that is most convex in the left-right direction. The left-right spacing of the fourth welding row is narrower than the left-right spacing of the first welding row and the second welding row. The second welding region is located at the upper end of the girth portion over a predetermined width, The first welding region is located below the second welding region.characterized in that Absorbent panty-type items . Other features of the present invention will be clarified from the description of the present specification and the accompanying drawings.

Effects of the Invention

[0007] According to the present invention, it is easy to obtain an impression of being flexible, soft and fitting Absorbent panty-type items can be provided.

Brief Description of Drawings

[0008] [Figure 1] It is a schematic perspective view of the pants-type disposable diaper 1. [Figure 2] It is a schematic plan view of the diaper 1 in an unfolded and stretched state as viewed from the wearer's skin side. [Figure 3] It is a schematic cross-sectional view taken along A-A in Fig. 2. [Figure 4] It is an explanatory view of weld rows Ra and Rb provided in an abdominal waist portion 20. [Figure 5] Figs. 5A and 5B are explanatory views of the attaching function of a waist elastic member 23. [Figure 6] It is an explanatory view of the weld row Ra included in a first weld region A1. [Figure 7] It is an explanatory view of the weld row Ra included in the first weld region A1. [Figure 8] Figs. 8A and 8B are explanatory views of the weld row Rb included in a second weld region A2. [Figure 9] It is a view schematically showing wrinkles 61 and 62 formed in the abdominal waist portion 20. [Figure 10] It is a photographic view explaining the wrinkle 61 formed in a first elastic region A1.

Mode for Carrying Out the Invention

[0009] At least the following matters will become apparent from the description of the present specification and the accompanying drawings. Embodiment 1 is an expandable sheet having a vertical and horizontal direction that intersects with each other, and a plurality of elastic members that can expand and contract in the horizontal direction are arranged between a pair of sheets joined by a plurality of welded portions, spaced apart in the vertical direction, wherein each of the elastic members, when contracted in the horizontal direction, is sandwiched between two of the vertically adjacent welded portions, thereby restricting its position in the horizontal direction relative to the pair of sheets, and has a plurality of rows of welded portions where the plurality of welded portions are arranged in the vertical direction, and the plurality of rows of welded portions include a first row of welded portions and a second row located adjacent to one side of the first row of welded portions in the horizontal direction An expandable sheet comprising a row of welded portions, wherein the first row of welded portions is convex to one side in the left-right direction and has a first convex portion and a second convex portion adjacent to each other in the up-down direction, and the second row of welded portions has a third convex portion that is convex to the other side in the left-right direction, and in a state extended in the left-right direction, at least a portion of the welded portion located on the far other side in the left-right direction at the third convex portion is located on the far other side in the left-right direction than the line connecting the ends of the welded portions on the far other side in the left-right direction at each of the first and second convex portions.

[0010] According to Embodiment 1, when the stretchable sheet contracts, arch-shaped wrinkles are easily formed along the convex portion, divided in the vertical direction. Therefore, the stretchable sheet is more easily folded in the vertical direction, increasing its flexibility. In addition, when the stretchable sheet is stretched, a portion of the first and second welded sections overlap in the horizontal direction, resulting in a tendency for the height of the convex portion to be higher and the slope of the convex portion to be larger. Therefore, large arch-shaped wrinkles are easily formed, and users who see these wrinkles are more likely to get the impression that the stretchable sheet is soft and conforms well to their body.

[0011] Embodiment 2 is the stretchable sheet according to Embodiment 1, characterized in that the plurality of welded rows include a third welded row located adjacent to one side of the second welded row in the left-right direction, the third welded row has a fourth convex portion that is convex to the other side in the left-right direction, and in an extended state in the left-right direction, the welded portion located furthest to the other side in the left-right direction at the fourth convex portion is located to one side in the left-right direction relative to the line.

[0012] According to embodiment 2, it is possible to suppress the rows of welded parts from becoming too close together in the left-right direction. Therefore, it is possible to suppress the reduction in the left-right flexibility of the stretchable sheet due to the hardness of the welded parts. In addition, it is possible to secure an area of ​​the sheet that will form a bow-shaped wrinkle between the first row of welded parts and the second row of welded parts, making it easier to form a bow-shaped wrinkle.

[0013] Embodiment 3 is the stretchable sheet according to Embodiment 1 or Embodiment 2, characterized in that, in the state extended in the left-right direction, more than half of the portion of the welded portion located on the far other side in the left-right direction at the third protrusion is located on the far other side in the left-right direction than the line.

[0014] According to embodiment 3, the length over which the first and second welded sections overlap in the left-right direction becomes longer, resulting in a tendency for the height of the protrusions to increase and the slope of the protrusions to become larger. Therefore, large arch-shaped wrinkles are more likely to form.

[0015] Embodiment 4 is the stretchable sheet according to Embodiment 3, characterized in that, in the state extended in the left-right direction, the entirety of the welded portion located on the far other side in the left-right direction at the third protrusion is located on the far other side in the left-right direction relative to the line.

[0016] According to embodiment 4, the length over which the first and second welded sections overlap in the left-right direction becomes longer, resulting in a tendency for the height of the protrusions to increase and the slope of the protrusions to become larger. As a result, large arch-shaped wrinkles are more likely to form.

[0017] Embodiment 5 is an expandable sheet according to any one of Embodiments 1 to 4, characterized in that, in the state stretched in the left-right direction, the distance between the first welded section row and the second welded section row in the left-right direction is 6 mm or more.

[0018] According to embodiment 5, compared to the case where the distance between the first and second welded rows in the left-right direction is less than 6 mm, it is possible to suppress the rows of welds from becoming too close together in the left-right direction. Therefore, it is possible to suppress the reduction in the left-right flexibility of the stretchable sheet due to the hardness of the welded parts. In addition, it is possible to secure an area of ​​the sheet that will form a bow-shaped wrinkle between the first and second welded rows, making it easier for the bow-shaped wrinkle to form.

[0019] Embodiment 6 is an expandable sheet according to any one of Embodiments 1 to 5, characterized in that the first protrusion is located above the second protrusion in the vertical direction, and in an extended state in the left-right direction, has another line connecting the other ends in the left-right direction of a plurality of welded parts constituting the second row of welded parts, a first intersection where the other line and the line intersect on the upper side, and a second intersection where the other line and the line intersect on the lower side in the vertical direction, and the vertical length from the other end in the left-right direction of the welded part located on the far left side of the first protrusion to the first intersection is longer than the vertical length from the first intersection to the second intersection.

[0020] According to embodiment 6, the gradient of the third protrusion tends to increase, making it easier for arch-shaped wrinkles with a steep gradient to form, and these arch-shaped wrinkles become more easily recognizable to the user.

[0021] Embodiment 7 is an elastic sheet according to any one of Embodiments 1 to 6, wherein the plurality of elastic members comprises a first elastic member and a second elastic member located adjacent to the lower side of the first elastic member in the vertical direction, and the lower of the two welded portions that sandwich the first elastic member in the vertical direction is discontinuous with the upper of the two welded portions that sandwich the second elastic member in the vertical direction.

[0022] According to embodiment 7, it is possible to suppress the increase in the vertical rigidity of the stretchable sheet due to the welding portion that is continuous in the vertical direction, and to increase the flexibility of the stretchable sheet in the vertical direction.

[0023] Embodiment 8 is a pant-type absorbent article having an elastic sheet as described in any of Embodiments 1 to 7, wherein the article has an absorbent body and a pair of waist portions, and the elastic sheet is provided on at least one of the pair of waist portions, the vertical direction of the elastic sheet is aligned with the vertical direction of the pant-type absorbent article, and the horizontal direction of the elastic sheet is aligned with the horizontal direction of the pant-type absorbent article.

[0024] According to embodiment 8, since the arch-shaped wrinkles along the convex portion are divided vertically and formed on the waist area, the waist area can be easily bent vertically, increasing its flexibility. In addition, users who see the arch-shaped wrinkles are more likely to get the impression that the waist area fits softly.

[0025] Embodiment 9 is the pant-type absorbent article according to Embodiment 8, characterized in that the stretchable sheet comprises a first welding region having a plurality of combinations of the first welding row and the second welding row adjacent to each other in the left-right direction.

[0026] According to embodiment 9, multiple arch-shaped wrinkles are easily formed in the left-right direction around the torso, making it easier for the user to get the impression that the garment fits softly around the torso.

[0027] Embodiment 10 is a pant-type absorbent article according to Embodiment 9, characterized in that the pair of waist portions are joined by a pair of side joints on both sides in the left-right direction, the first welding region overlaps in the left-right direction with at least a portion of the side joint on one side in the left-right direction, and overlaps in the left-right direction with at least a portion of the side joint on the other side in the left-right direction.

[0028] According to embodiment 10, multiple arch-shaped wrinkles are easily formed in the left-right direction over a wide area around the torso, making it easier for the user to get the impression that the garment fits softly around the torso.

[0029] Embodiment 11 is a pant-type absorbent article according to Embodiment 9 or Embodiment 10, characterized in that the stretchable sheet has a second welded region, in the second welded region there are multiple rows of fourth welded portions arranged in the left-right direction, each row having convex portions that alternately protrude on one side and the other side in the left-right direction, and when the stretchable sheet is stretched in the left-right direction, adjacent rows of the fourth welded portions in the left-right direction do not overlap, or the length of the overlap in the left-right direction is less than or equal to the length in the left-right direction of the welded portion located on the side of the convex portion that is most convex in the left-right direction, the spacing of the fourth welded portions in the left-right direction is narrower than the spacing of the first welded portion row and the second welded portion row in the left-right direction, the second welded region is located over a predetermined width at the upper end of the waist portion, and the first welded region is located below the second welded region.

[0030] According to embodiment 11, in the second welded region, wrinkles similar to vertical creases are formed at narrower intervals compared to the first welded region. As a result, the user is more likely to feel that the upper part (second welded region A2) fits snugly around the waist and is less likely to slip down, while the other parts (first welded region A1) fit softly and comfortably.

[0031] ===Implementation Method=== Hereinafter, embodiments of the pant-type absorbent article using the stretchable sheet according to this embodiment will be described using adult pant-type disposable diapers as an example. However, the pant-type absorbent article is not limited to the above, and may also be, for example, pant-type disposable diapers for infants or panty-type sanitary napkins.

[0032] <<Basic components of a pull-up style disposable diaper 1>> Figure 1 is a schematic perspective view of a pull-up type disposable diaper 1 (hereinafter also referred to as "diaper"). Figure 2 is a schematic plan view of diaper 1 in its unfolded and extended state, as seen from the wearer's skin side. Figure 3 is a schematic cross-sectional view of AA in Figure 2.

[0033] Diaper 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 vertical direction, the waist opening BH side is the upper side, and the side that is between the wearer's legs is the lower side. In the front-to-back direction, the side that is on the wearer's stomach is the front side, and the side that is on the wearer's back is the back side. Furthermore, as shown in Figure 3, diaper 1 has a thickness direction in which the materials are layered, and in the thickness direction, the side that is in contact with the wearer is the skin side, and the opposite side is the non-skin side.

[0034] Diaper 1 comprises an absorbent body 10 and a pair of waist sections 20 and 30. The pair of waist sections 20 and 30 are joined to the non-skin side of the absorbent body 10 with an adhesive or the like. The front-facing waist section 20 is also called the ventral waist section 20, and the rear-facing waist section 30 is also called the dorsal waist section 30. The ventral waist section 20 and the dorsal waist section 30 are joined on both sides in the left-right direction by a pair of side joints SS. Examples of joining methods using the side joints SS include heat welding, ultrasonic welding, and joining with adhesive.

[0035] As shown in Figure 3, the absorbent body 10 includes an absorbent core 11, a liquid-permeable top sheet 12 positioned on the skin side of the absorbent core 11, a liquid-impermeable back sheet 13 positioned on the non-skin side of the absorbent core 11, and an outer sheet 14. The absorbent core 11 can be any material that absorbs and retains excretory fluid, and examples include liquid-absorbent materials such as pulp fibers or superabsorbent polymers molded into a predetermined shape. The absorbent core 11 may also be covered with a liquid-permeable sheet such as tissue paper or nonwoven fabric.

[0036] As shown in Figure 2, elastic leg members 15 (e.g., elastic thread) that expand and contract along the longitudinal direction of the absorbent body 10 may be provided on both sides of the absorbent body 10 in the left-right direction. Furthermore, a leak-proof wall portion that can stand upright on the skin side may be provided inward in the left-right direction from the elastic leg members 15. The leak-proof wall portion is formed, for example, by folding both sides of the outer sheet 14 inward in the left-right direction so that they are positioned on the skin side of the top sheet 12, and providing an elastic leak-proof wall member 16 (e.g., elastic thread) that expands and contracts in the longitudinal direction at the folded portion.

[0037] In this embodiment, the portions that overlap vertically with the side joint portion SS are defined as waist portions 20 and 30, and the ventral waist portion 20 and the dorsal waist portion 30 are rectangular in plan view. An extension portion 30E, which is roughly trapezoidal in shape, is provided on the crotch side of the dorsal waist portion 30. The extension portion 30E can cover the wearer's buttocks. In the following description, the dorsal waist portion 30 and the extension portion 30E together will also be referred to as the dorsal outer portion 30 and 30E. However, the invention is not limited to the above, and for example, there may be a configuration that does not have an extension portion 30E on the dorsal side, or a configuration that has a portion extending from the ventral waist portion 20 towards the crotch side.

[0038] The ventral torso section 20 and the dorsal outer sections 30, 30E each have a skin-side sheet 21, 31, a non-skin-side sheet 22, 32, and a torso elastic member 23, 33 (e.g., elastic thread) that is expandable in the left-right direction. The multiple torso elastic members 23, 33 are arranged with vertical spacing between the skin-side sheet 21, 31 and the non-skin-side sheet 22, 32.

[0039] The skin-side sheets 21, 31 and the non-skin-side sheets 22, 32 are preferably flexible sheet materials, and examples include spunbond nonwoven fabric, meltblown nonwoven fabric, and SMS (spunbond / meltblown / spunbond) nonwoven fabric. The constituent fibers of the nonwoven fabric are not limited to single fibers of polypropylene (PP), a typical example of thermoplastic resin, but may also be single fibers of other thermoplastic resins such as polyethylene (PE), or composite fibers having a sheath core structure such as PE and PP may be used.

[0040] The basic configuration of diaper 1 has been described above, but the configuration of diaper 1 described above is just one example and is not limited thereto. For example, in diaper 1 of this embodiment, the ventral waist portion 20 and the dorsal outer portion 30, 30E are made of separate members, and the non-skin side of the absorbent body 10 is exposed in the crotch area. However, it is not limited to this, and for example, it may be a diaper having an outer member made of three members: the ventral waist portion 20, the dorsal outer portion 30, 30E and the crotch area connecting them, or it may be a diaper having an outer member made of a single continuous member extending from the ventral waist portion 20 to the dorsal waist portion 30.

[0041] <<Regarding the waist area 20, 30 (stretchable sheet 40)>> Figure 4 is an explanatory diagram of the welded sections Ra and Rb provided on the ventral waist portion 20. Figures 5A and 5B are explanatory diagrams of the attachment function of the waist elastic member 23. Figures 6 and 7 are explanatory diagrams of the welded section Ra in the first welded region A1. Figures 8A and 8B are explanatory diagrams of the welded section Rb in the second welded region A2. Figure 9 is a schematic diagram showing the wrinkles 61 and 62 formed in the ventral waist portion 20. Figure 10 is a photograph illustrating the wrinkles 61 formed in the first stretch region A1.

[0042] Figures 4, 6, 7, 8A, and 8B show the state when the ventral waist portion 20 (stretchable sheet 40) is stretched in the left-right direction. The state in which the waist portions 20, 30 and the stretchable sheet 40 are stretched in the left-right direction means that they are stretched to the point where the wrinkles that were present in the waist portions 20, 30 and the stretchable sheet 40 are substantially no longer visible, and that the dimensions of each component constituting the waist portions 20, 30 and the stretchable sheet 40 (for example, the skin-side sheet 21, etc.) are equal to or close to the dimensions of the individual component (i.e., the dimensions when the elasticity of the elastic component is not exhibited).

[0043] <Regarding the positional restriction of the elastic member 23 around the waist> The ventral and dorsal waist sections 20 and 30 are composed of an elastic sheet 40 in which multiple waist elastic members 23, 33 (elastic members) that can expand and contract in the left-right direction are arranged at vertical intervals between skin-side sheets 21, 31 and non-skin-side sheets 22, 32 (between a pair of sheets) that are joined by multiple welded joints 50. As shown in Figure 6, the skin-side sheets 21, 31 and non-skin-side sheets 22, 32 are intermittently joined by multiple welded joints 50 that are discretely arranged in the vertical and left-right directions. Examples of methods for forming the welded joints 50 include well-known welding methods such as ultrasonic welding and heat welding.

[0044] The pair of sheets joined by the welded portion 50 may be two separate sheets, as in this embodiment with the skin-side sheets 21, 31 and the non-skin-side sheets 22, 32, or it may be a single sheet folded over to form two layers. Furthermore, the welded portion 50 is not limited to joining only the pair of sheets sandwiching the waist elastic members 23, 33, but may also join three or more layers of sheets, including sheets laminated on the pair of sheets.

[0045] Since the ventral girth portion 20 and the dorsal girth portion 30 have generally the same configuration, the ventral girth portion 20 will be described below as a representative example of both. The ventral torso section 20 (stretchable sheet 40) has multiple welded section rows Ra, Rb, in which multiple welded sections 50 are arranged vertically. The multiple welded section rows Ra, Rb are arranged with spacing D3, D4 in the left-right direction. As shown in Figure 4, the welded section rows Ra, Rb in this embodiment extend vertically while meandering horizontally. In other words, as shown in Figure 6, the left-right positions of adjacent welded sections 50 in the vertical direction are offset.

[0046] On the other hand, the welded portions 50 adjacent to each other in the left-right direction are aligned in the vertical position. Therefore, as shown in FIG. 5A, the vertical positions of the spaces through which the waist elastic member 23 passes, which are between the welded portions 50 adjacent to each other in the vertical direction, are aligned, so that the waist elastic member 23 can be arranged along the left-right direction. However, the present invention is not limited thereto: the welded portions 50 adjacent to each other in the left-right direction may be shifted in vertical position, and the waist elastic member 23 may pass between the welded portions 50 having different vertical positions. Also in these cases, stretchability in the left-right direction can be imparted to the ventral waist portion 20.

[0047] As shown in FIG. 5A, the two welded portions 50 located on both sides of the waist elastic member 23 in the vertical direction are also referred to as a "welded portion pair 50S". The upper welded portion 50 and the lower welded portion 50 forming the welded portion pair 50S are arranged with a gap GH50 therebetween in the vertical direction. The size of the gap GH50 is set to be equal to or slightly larger than the outer diameter D1 of the waist elastic member 23 when the ventral waist portion 20 is maximally stretched in the left-right direction (GH50≧D1).

[0048] However, the waist elastic member 23 becomes thicker as it contracts in the left-right direction. Therefore, as shown in FIG. 5B, the gap GH50 of the welded portion pair 50S is set to be smaller than the maximum outer diameter D2 of the waist elastic member 23 in a state where the waist elastic member 23 is contracted in the left-right direction (that is, the natural state of the ventral waist portion 20) (GH50<D2). By this means, the waist elastic member 23 in a state contracted in the left-right direction is sandwiched in the vertical direction by the welded portion pair 50S (expansion in the vertical direction is restricted). Accordingly, the positions (movement) of the waist elastic member 23 in the left-right direction and the vertical direction relative to the skin-side sheet 21 and the non-skin-side sheet 22 are restricted.

[0049] Therefore, even without fixing the torso elastic member 23 to the skin-side sheet 21 and the non-skin-side sheet 22 using adhesive, displacement of the torso elastic member 23 can be suppressed, and the elasticity of the ventral torso portion 20 is maintained. In other words, by utilizing the welded portion 50, the torso elastic member 23 can be attached to the skin-side sheet 21 and the non-skin-side sheet 22 without using adhesive, or with reduced adhesive usage. Thus, a decrease in the flexibility of the ventral torso portion 20 (stretchable sheet 40) due to adhesive hardening can be suppressed. Furthermore, a decrease in the elastic properties of the torso elastic member 23 due to adhesive hardening can be suppressed.

[0050] Furthermore, in the ventral waist portion 20, the waist elastic member 23 is fixed to the skin-side sheet 21 and the non-skin-side sheet at the side joint SS. Specifically, during the manufacturing of the diaper 1, the stretched waist elastic member 23 is sandwiched between the skin-side sheet 21 and the non-skin-side sheet 22 when the side joint SS is formed, and the end of the waist elastic member 23 is fixed to the side joint SS. Therefore, even if the ventral waist portion 20 is greatly stretched when the diaper 1 is worn, it is possible to prevent the waist elastic member 23 from coming out from between the welded portions 50S, and the elasticity of the ventral waist portion 20 is maintained.

[0051] Furthermore, the relationship between the distance GH50 between the welded portions 50S and the outer dimensions D1, D2 of the waist elastic member 23 is not limited to the above. For example, a portion of the waist elastic member 23 may overlap with the welded portion 50 to the extent that the waist elastic member 23 is not cut. In this case as well, when the waist elastic member 23 is contracted in the left-right direction, it is sandwiched between the welded portions 50S, and its position in the left-right and up-down directions relative to the skin-side sheet 21 and the non-skin-side sheet 22 is restricted.

[0052] Furthermore, it is not the case that all of the torso elastic members 23 (elastic members) arranged on the ventral torso portion 20 (stretchable sheet 40) are sandwiched between the welded portion pairs 51 and their positions are restricted. It is sufficient that at least some of the torso elastic members 23 have their positions restricted by the welded portion pairs 51, and some other torso elastic members 23 may be fixed to the skin-side sheet 21 and the non-skin-side sheet 22 with adhesive.

[0053] <Regarding the first welding area A1> As shown in Figure 4, the ventral girth portion 20 has a first welding region A1 and a second welding region A2, which have different shapes and spacings of welded rows Ra and Rb. First, let's describe the first welding region A1. The first welding region A1 is located below the second welding region A2 and is longer in the vertical direction than the second welding region A2. In the first welding region A1, multiple welding region rows Ra, each with the same arrangement pattern of welding region 50, are arranged horizontally at equal intervals D3. The welding region rows Ra meander horizontally while extending vertically, and have a shape in which convex portions that are convex on one side and the other side in the horizontal direction alternately in the vertical direction.

[0054] In this embodiment, the shape of the welded portion 50 is a long rectangle in the left-right direction, but the shape of the welded portion 50 is not particularly limited. Also, in this embodiment, all the welded portions 50 belonging to the welded portion row Ra have the same shape, but the configuration may include different shapes. Furthermore, although the welded portion rows Ra and Rb illustrated in Figure 4 extend along the vertical direction, the configuration is not limited to this, and the welded portion rows may extend in a direction inclined with respect to the vertical direction, and the upper and lower ends of the welded portion rows may be offset in the left-right direction.

[0055] When the ventral torso portion 20 contracts in the left-right direction, the highly rigid welded portion 50 is less likely to contract, thus narrowing the spacing between adjacent welded portion rows Ra in the left-right direction. As a result, the skin-side sheet 21 and non-skin-side sheet 22 located between adjacent welded portion rows Ra in the left-right direction bulge outward in a convex shape in the thickness direction, making it easy for wrinkles to form along the shape of the welded portion row Ra.

[0056] Here, let's assume that, unlike the welded section row Ra of the first welded region A1, a welded section row is formed that is, for example, linearly aligned in the vertical direction, that is, a welded section row in which multiple welded sections that are in the same position in the left-right direction are aligned vertically. In this case, long, linear wrinkles are likely to form along the vertical direction. Such wrinkles act like tension rods, increasing the vertical rigidity of the ventral waist area and potentially reducing its flexibility. Also, since the pairs of welded sections that sandwich the waist elastic member are concentrated in the same position in the left-right direction, the waist elastic member is likely to adhere locally to a part of the wearer, potentially leaving gather marks on the skin or reducing comfort.

[0057] In contrast, the first welded region A1 has rows of welded parts Ra that meander in the left-right direction. As a result, curved wrinkles are formed along the convex parts of the rows of welded parts Ra, which switch direction in the left-right direction and are divided in the up-down direction. Therefore, the first welded region A1 is more easily bent in the up-down direction, and its flexibility in the up-down direction is increased.

[0058] Furthermore, focusing on a portion of the first welding region A1, the first welding region A1 comprises a first welding row Ra1 and a second welding row Ra2 located adjacent to one side of the first welding row Ra1 in the left-right direction. As shown in Figure 6, the first welding row Ra1 is convex on one side in the left-right direction (towards the second welding row Ra2) and has a first convex portion 51 and a second convex portion 52 adjacent in the vertical direction. The second welding row Ra2 has a third convex portion 53 that is convex on the other side in the left-right direction (towards the first welding row Ra1). The third convex portion 53 is located between the first convex portion 51 and the second convex portion 52 in the vertical direction.

[0059] Then, with the ventral girth portion 20 extended in the left-right direction, the imaginary line La is defined as the line connecting the ends of the welded portions 501 and 502 located on the far left-right side of the first convex portion 51 and the second convex portion 52, respectively, on the other side in the left-right direction. At this time, at least a portion of the welded portion 503 located on the far left-right side of the third convex portion 53 of the second welded portion row Ra2 is located on the other side in the left-right direction, beyond the imaginary line La.

[0060] In other words, the imaginary line La corresponds to the base of the convex portion (hereinafter referred to as the fifth convex portion 55) of the first welding row Ra1, which is convex toward the other side in the left-right direction, and the third convex portion 53 is inserted inside the imaginary line La (on the other side in the left-right direction). To put it another way, the height H (length in the left-right direction) of the fifth convex portion 55 is greater than the left-right distance D3 between the first welding row Ra1 and the second welding row Ra2, so that the first welding row Ra1 and the second welding row Ra2 partially overlap in the left-right direction (H>D3).

[0061] Therefore, compared to the case where the third protrusion 53 is located outside (on one side in the left-right direction) of the imaginary line La, the fifth protrusion 55 and the third protrusion 53 tend to come closer together when the ventral girth portion 20 contracts. Consequently, the unwelded sheet portion between the fifth protrusion 55 and the third protrusion 53 bulges outward in the thickness direction along the fifth protrusion 55 and the third protrusion 53. This outwardly bulging sheet portion tends to collapse towards the base side (one side in the left-right direction) of the fifth protrusion 55, and as a result, as shown in Figures 9 and 10, arc-shaped (curved) wrinkles 61 along the protrusions of the welded portion row Ra tend to form.

[0062] Furthermore, as described above, if the height H of the fifth protrusion 55 is greater than the left-right spacing D3 of the welded section row Ra, then the amount of meandering in the left-right direction of the fifth protrusion 55 is large, and the slope of the fifth protrusion 55 tends to be steeper. As a result, larger arch-shaped wrinkles 61 are more likely to form. Therefore, it becomes easier for users to recognize that arch-shaped wrinkles 61 have been formed, which are different from the wrinkles that are typically formed around the body, for example, the vertical wrinkles that form along the vertical direction when an elastic member around the body is fixed to the sheet with adhesive.

[0063] Furthermore, users who perceive the arched wrinkles 61 are more likely to perceive a reduced sense of tightness and a softer fit around the ventral waist area 20 compared to when they perceive the vertical wrinkles that typically form around the waist. In fact, compared to vertical wrinkles that are firmly pushed up in the thickness direction by rows of welded seams running vertically, the arched wrinkles 61, which are pushed up while curving horizontally along the shape of the convex portions of the welded seam rows Ra, tend to have a softer feel.

[0064] Furthermore, as mentioned above, the ventral waist portion 20 of this embodiment is highly flexible because the waist elastic member 23 is attached without using adhesive (or with reduced adhesive). Therefore, users who see the bow-shaped wrinkles 61 and get the impression that the ventral waist portion 20 is soft will be able to more easily appreciate the flexibility of the ventral waist portion 20 due to the absence of adhesive. By increasing the flexibility of the ventral waist portion 20, it becomes easier for the ventral waist portion 20 to fit the wearer's body.

[0065] Figure 10 is a photograph of the natural state of an elastic sheet that was actually fabricated, with an elastic member placed between a pair of sheets to illustrate the arch-shaped wrinkles 61. Specifically, the length of the welded portion 50 in the left-right direction was set to 2.5 mm, the spacing between the welded portion rows Ra (D3) was set to 15 mm, the height of the protrusion (H) was set to 25.6 mm, and the length of the base of the protrusion (length in the vertical direction from welded portion 501 to welded portion 502) was set to 50 mm.

[0066] Furthermore, as mentioned above, it is sufficient that at least a portion of the welded portion 503 located on the farthest side in the left-right direction at the third protrusion 53 is located inside the imaginary line La (the other side in the left-right direction). However, preferably, more than half of the portion of the welded portion 503 in the left-right direction is located inside the imaginary line La (the other side in the left-right direction). More preferably, as shown in Figure 6, the entire welded portion 503 is located on the other side in the left-right direction from the imaginary line La.

[0067] This increases the overlapping length of the first welding row Ra1 and the second welding row Ra2 in the left-right direction. Therefore, when the ventral waist portion 20 contracts, the fifth protrusion 55 and the third protrusion 53 tend to come closer together, and arch-shaped wrinkles 61 along the protrusions are more easily formed. Furthermore, a longer overlapping length of the first welding row Ra1 and the second welding row Ra2 in the left-right direction indicates that the height H of the protrusions in the welding row Ra is high, and the slope of the protrusions tends to be large. As a result, larger arch-shaped wrinkles 61 are more easily formed, and users tend to have a softer impression of the ventral waist portion 20.

[0068] Furthermore, as shown in Figure 6, the first welding region A1 includes a third welding section row Ra3 located adjacent to one side of the second welding section row Ra2 in the left-right direction. The third welding section row Ra3 has a fourth convex section 54 that is convex on the other side in the left-right direction. The fourth convex section 54 is in the same vertical position as the third convex section 53 and is located between the first convex section 51 and the second convex section 52 in the vertical direction.

[0069] Furthermore, when the ventral girth portion 20 is extended in the left-right direction, it is preferable that the welded portion 504 located on the far other side in the left-right direction (towards the second welded portion row Ra2) of the fourth protrusion 54 is located outside the imaginary line La (on one side in the left-right direction). In other words, it is preferable that the height H of the fifth protrusion 55 of the first welded portion row Ra1 is shorter than twice the length of the left-right spacing D3 of the welded portion row Ra (H < 2 × D3).

[0070] In other words, the first welding row Ra1 overlaps with the second welding row Ra2 which is adjacent in the left-right direction, but does not overlap with the further adjacent third welding row Ra3, or the degree of overlap is small (less than or equal to the left-right length of the welding section 50).

[0071] By doing so, the spacing D3 in the left-right direction of the welded section rows Ra is set to be relatively large, preventing the welded section rows Ra from being densely arranged in the left-right direction. Therefore, it is possible to suppress the reduction in the left-right flexibility of the ventral girth section 20 due to the hardness of the welded section 50.

[0072] Furthermore, by making the left-right spacing D3 of the welded section row Ra appropriately large, the area of ​​the sheet located between the welded section row Ra, that is, the area of ​​the sheet that bulges outward in the thickness direction when the ventral girth section 20 contracts, is secured. As a result, arch-shaped wrinkles 61 with length in the vertical direction are more easily formed. However, the above is not limited to the above, and the fourth convex portion 54 (welded portion 504) of the third welded section row Ra3 may be located inside (on the other side in the left-right direction) of the imaginary line La.

[0073] Furthermore, when the ventral girth portion 20 is extended in the left-right direction, it is preferable that the left-right spacing D3 between the first welded portion row Ra1 and the second welded portion row Ra2 is 6 mm or more. By doing so, it is possible to prevent the welded portion rows Ra from becoming too close together in the left-right direction compared to when the left-right spacing D3 of the welded portion rows Ra is less than 6 mm. Thus, it is possible to suppress the reduction in the flexibility of the ventral girth portion 20 due to the hardness of the welded portion 50.

[0074] Furthermore, even if the lateral spacing D3 of the welded rows Ra is set to 6 mm or more to maintain a reasonable distance, the fact that the first welded row Ra1 and the second welded row Ra2 partially overlap in the lateral direction (meaning H > D3) indicates that the height H of the welded row Ra tends to be high and the gradient is large. As a result, larger arch-shaped wrinkles 61 are more likely to form, and users tend to get a softer impression of the ventral waist area 20. However, this is not limited to the above, and the spacing D3 may be less than 6 mm.

[0075] As shown in Figure 6, the interval D3 is the length in the left-right direction between the left-right center of a certain welded portion 50 belonging to the first welded portion row Ra1 and the left-right center of a welded portion 50 belonging to the second welded portion row Ra2 that is at the same vertical position as that welded portion 50 or is the closest to it in the vertical direction.

[0076] Furthermore, the height H of the protrusions in the welded section row Ra is the length in the left-right direction between the welded section (e.g., welded section 501) located furthest to one side of the protrusions that protrude to one side in the left-right direction (e.g., first protrusion 51) and the welded section (e.g., welded section 505) located furthest to the other side of the protrusions that are adjacent to that protrusion in the vertical direction and protrude to the other side in the left-right direction (e.g., fifth protrusion 55).

[0077] Furthermore, as shown in Figure 7, in the first welded section row Ra, the first protrusion 51 is located above the second protrusion 52 in the vertical direction. When the ventral girth section 20 is extended in the left-right direction, the line connecting the other ends in the left-right direction of the multiple welded sections 50 constituting the second welded section row Ra2 (another line) is defined as the virtual line Lb. Note that, as shown in Figure 7, if the shape of the welded section 50 is a rectangle or the like, and the other end in the left-right direction of the welded section 50 is a side with length in the vertical direction, the line connecting the vertical centers of that side is defined as the virtual line Lb. Furthermore, the point where the virtual line Lb and the aforementioned virtual line La intersect in the upper vertical direction is defined as the first intersection P1, and the points where the virtual line Lb and the virtual line La intersect in the lower vertical direction are defined as the second intersection P2.

[0078] In this case, it is preferable that the vertical length W2 from the other end of the welded portion 501 located on the left-right side of the first protrusion 51 to the first intersection P1 is longer than the vertical length W3 from the first intersection P1 to the second intersection P2 (W2 > W3). If the other end of the welded portion 501 on the left-right side is a side that has length in the vertical direction, W2 is defined as the length from the vertical center of that side.

[0079] The relatively short vertical length W3 from the first intersection P1 to the second intersection P2 means that the gradient of the third protrusion 53 tends to be larger. As a result, a steeply sloped, arch-shaped wrinkle 61 is more easily formed along the protrusion of the welded section row Ra, and this arch-shaped wrinkle 61 is more easily recognized by the user. It can also be said that the third protrusion 53 does not extend too far inside the imaginary line La (to the other side in the left-right direction). As a result, the welded section row Ra does not become too densely aligned in the left-right direction, and the flexibility of the ventral waist section 20 is ensured. Furthermore, when the ventral waist section 20 shrinks, an area of ​​the sheet that bulges outward in the thickness direction is ensured, making it easier to form the arch-shaped wrinkle 61. However, the above is not limited to the above, and the length W2 may be less than or equal to the length W3.

[0080] Furthermore, the presence of convex portions in the welded portion row Ra makes it easier for arch-shaped wrinkles 61 to form along the convex portions. However, if the convex portions of the welded portion row Ra are formed by continuous welded portions in the vertical direction, the rigidity of the ventral girth portion 20 in the vertical direction will increase due to the hardness of the welded portions. Therefore, as shown in Figure 6, it is preferable to arrange the welded portions 50 with gaps in the vertical direction, while shifting the positions of adjacent welded portions 50 in the horizontal direction, so that the welded portion row Ra has a shape with convex portions.

[0081] Specifically, as shown in Figure 6, the lower of the two welded portions 50 that sandwich a certain girth elastic member 231 (first elastic member) in the vertical direction is discontinuous with the upper of the two welded portions 50u that sandwich a girth elastic member 232 (second elastic member) located next to the lower girth elastic member 231 in the vertical direction. This prevents the vertical rigidity of the ventral girth portion 20 from increasing due to the hardness of the welded portion 50, making the ventral girth portion 20 easier to bend vertically and increasing its vertical flexibility.

[0082] Furthermore, in the ventral girth portion 20, multiple girth elastic members 23 are arranged vertically, but the number and spacing of these members are not particularly limited. However, preferably, in the welded portion row Ra, at least one girth elastic member 23 is provided between two convex portions that are convex on the same side in the left-right direction and adjacent in the vertical direction, for example, between the welded portion 501 of the first convex portion 51 and the welded portion 502 of the second convex portion 52. By doing so, when the ventral girth portion 20 contracts, the welded portion row Ra adjacent in the left-right direction is more likely to come into close proximity between two convex portions adjacent in the vertical direction (for example, the fifth convex portion 55 and the third convex portion 53), making it easier for arch-shaped wrinkles 61 to form.

[0083] Furthermore, in the welding row Ra of the first welding region A1, the convex parts, which have the same shape (same height and slope), are arranged alternately in the vertical direction, with some convex on one side in the left-right direction and others on the other side in the left-right direction. Therefore, some of the convex parts in the welding row Ra overlap with adjacent welding row Ra in the left-right direction.

[0084] For example, as shown in Figure 7, the second protrusion 52 is located on one side in the left-right direction relative to a virtual line Ld extending downward in the vertical direction from one end in the left-right direction of the welded portion 503, which is located on the far other side in the left-right direction at the third protrusion 53. Therefore, an opposite arch-shaped wrinkle 61 (a wrinkle along the second protrusion 52) is more likely to form below the arch-shaped wrinkle 61 formed between the fifth protrusion 55 and the third protrusion.

[0085] Thus, it is preferable that the welded section row Ra has a meandering shape in the left-right direction, and that, as shown in Figures 9 and 10, arch-shaped wrinkles 61 that are convex on one side and the other side in the left-right direction are alternately formed in the up-down direction. By doing so, the wrinkles 61 formed on the ventral girth section 20 are divided in the up-down direction by the change in the direction of the arch-shaped wrinkles 61. As a result, the ventral girth section 20 becomes easier to bend in the up-down direction, and the flexibility of the ventral girth section 20 is increased.

[0086] However, the shape of the welded section row Ra is not limited to the above. For example, only a portion of the welded section row Ra may have a convex shape, while another portion may have a straight shape, or it may have convex shapes (height and slope) that differ from the above.

[0087] Furthermore, in the first welding region A1 of this embodiment, welding region rows Ra, which have the same arrangement pattern of welding regions 50, are arranged at equal intervals D3 in the left-right direction. Therefore, in the first welding region A1, the first welding region row Ra1, which has a first protrusion 51 and a second protrusion 52, and the second welding region row Ra2, which has a third protrusion 53, are arranged alternately in the left-right direction. In other words, the first welding region A1 has multiple combinations of first welding region rows Ra1 and second welding region rows Ra2 that are adjacent to each other in the left-right direction.

[0088] Therefore, in the first welded region A1, the aforementioned relationship between the first convex portion 51 and the third convex portion 53 is established in multiple sets of adjacent welded portion rows Ra in the left-right direction. Consequently, multiple arch-shaped wrinkles 61 are easily formed in the left-right direction in the first welded region A1, making it easier for the user to get a soft impression of the ventral torso area 20. The aforementioned third welded portion row Ra3 also corresponds to the first welded portion row Ra1, and the fourth convex portion 54 of the third welded portion row Ra3 corresponds to the fifth convex portion 55 of the first welded portion row Ra1.

[0089] More preferably, the first welded region A1 overlaps in the left-right direction with at least a portion of one side joint SS in the left-right direction, and overlaps in the left-right direction with at least a portion of the other side joint SS in the left-right direction, as shown in Figure 4. In Figure 4, the welded region row Ra is formed to a portion outside the side joint SS in the left-right direction.

[0090] In this case, arch-shaped wrinkles 61 are more likely to form over a wide area in the left-right direction of the ventral torso area 20. Therefore, the arch-shaped wrinkles 61 are more easily recognized by the user, and the user is more likely to have a soft impression of the ventral torso area 20.

[0091] Furthermore, as in the first welding region A1 of this embodiment, it is preferable that the welding section rows Ra, which have the same arrangement pattern of the welding sections 50, are arranged at equal intervals D3 in the left-right direction. This makes it easier to form more arch-shaped wrinkles 61. Note that the same arrangement pattern and equal intervals D3 refer to design equality and include slight deviations due to manufacturing errors. However, without limiting itself to the above, the first welding region A1 may have at least one, preferably more, combinations of the first welding section row Ra1 and the second welding section row Ra2, and the first welding region A1 may have welding section rows of different shapes or different spacings between the welding section rows. In that case, the first welding region A1 is defined as the range from the first welding section row Ra1 or second welding section row Ra2 located on the far one side in the left-right direction to the first welding section row Ra1 or second welding section row Ra2 located on the far other side.

[0092] Further, when the skin-side sheet 21 and the non-skin-side sheet 22 (a pair of sheets) constituting the ventral waist circumference portion 20 (elastic sheet 40) are nonwoven fabrics, the nonwoven fabric may sometimes be embossed. In such a case, it is preferable that the shape of one embossed pattern is a shape in which the length in the left-right direction is equal to or less than the length in the up-down direction (for example, a dot, a square, a rhombus, an ellipse, a rectangle elongated in the up-down direction, etc.). By this configuration, when the ventral waist circumference portion 20 contracts in the left-right direction, the sheet between the welded portion rows Ra bulges outward in the thickness direction, and arcuate wrinkles 61 are easily formed.

[0093] (Regarding Second Welded Region A2) Next, the second welded region A2 will be described. As shown in FIG. 4, the second welded region A2 is located above the first welded region A1, and is positioned over a predetermined width at the upper end portion of the ventral waist circumference portion 20. The upper end portion of the waist circumference portion refers to an upper region when the waist circumference portion is divided into two in the up-down direction, and is preferably the uppermost region when the waist circumference portion is divided into three in the up-down direction. FIG. 4 illustrates a case where the second welded region A2 is located in a region having a predetermined width W1 (e.g., about 30 mm) from the upper end 20a of the ventral waist circumference portion 20, but the present invention is not limited thereto. For example, the second welded region A2 may be located at a position spaced downward from the upper end 20a of the ventral waist circumference portion 20.

[0094] The welded portion row Rb (fourth welded portion row) included in the second welded region A2, similarly to the welded portion row Ra included in the first welded region A1, has convex portions that are convex alternately on one side and the other side in the left-right direction, and forms a meandering shape in the left-right direction. However, it is preferable that the welded portion rows are arranged in the left-right direction at an interval D4 (<D3) that is narrower than the left-right direction interval D3 of the welded portion rows Ra included in the first welded region A1.

[0095] Further, when the ventral waist circumference portion 20 is stretched in the left-right direction, it is preferable to satisfy any one of the following conditions. First, as shown in FIG. 8A, the overlapping length of adjacent welded portion rows Rb in the left-right direction is preferably equal to or less than the length h in the left-right direction of the welded portion 50 (for example, welded portion 506 or welded portion 507) located on the most convex side among the convex portions of the welded portion rows Rb. In other words, for each of the convex portions 56 and 57 in the welded portion row Rb on the other side in the left-right direction, which are convex to one side in the left-right direction and adjacent in the up-down direction, the imaginary line Le is defined as the line connecting the ends on the other side in the left-right direction of the welded portions 506 and 507 located on the furthest side in the left-right direction. At this time, a portion of the convex portion 58 in the welded portion row Rb adjacent to the one side in the left-right direction, which is convex to the other side in the left-right direction, overlaps with the convex portions 56 and 57, but it is preferable that it be located outside the imaginary line Le (on one side in the left-right direction).

[0096] Alternatively, as shown in Figure 8B, adjacent welded sections Rb in the left-right direction do not need to overlap in that direction. In other words, the left-right end of one welding row Rb (protrusions 56, 57) located on the other side in the left-right direction should either coincide with the left-right end of the left-right end of the welding row Rb (protrusions 58) located on the other side in the left-right direction, or be separated in the left-right direction.

[0097] In the above case, the amount of meandering of the protrusions 56-58 in the welded row Rb is small, and the gradient of the protrusions 56-58 tends to be small. Therefore, when the ventral girth portion 20 contracts, as shown in Figure 9, the wrinkles 62 formed between the welded row Rb have a smaller inclination in the vertical direction (wrinkles closer to vertical wrinkles) compared to the arch-shaped wrinkles 61 formed in the first welded region A1. In the second welded region A2, such wrinkles 62 are formed at a narrower interval than the wrinkles 61 formed in the first welded region A1.

[0098] Therefore, users who see the second welded area A2 are more likely to get the impression that it fits better than the first welded area A1. By providing such a second welded area A2 at the upper end of the ventral waist area 20, users are more likely to get the impression that the upper part of the waist (second welded area A2) fits snugly and is less likely to slip down, while the other parts (first welded area A1) fit softly and are comfortable to wear.

[0099] Furthermore, the formation of wrinkles 62 similar to vertical wrinkles in the second welding region A2 increases the vertical rigidity of the second welding region A2. This also suppresses the curling of the upper end of the ventral waist portion 20 due to the curvature of the wearer's abdomen, etc. However, the ventral waist portion 20 (stretchable sheet 40) does not have to have the second welding region A2, and is not limited to the above.

[0100] (others) In the above embodiment, the elastic sheet 40 is provided on the ventral waist portion 20. That is, the elastic sheet 40 is provided on the ventral waist portion 20 such that the left-right direction of the elastic sheet 40 (the direction along which the elastic member follows) aligns with the left-right direction of the pant-type diaper 1, and the up-down direction of the elastic sheet 40 (the direction perpendicular to the elastic member) aligns with the up-down direction of the pant-type diaper 1. In addition, in the above embodiment, both the ventral waist portion 20 and the dorsal waist portion 30 are made of the elastic sheet 40, but only one of the waist portions may be made of the elastic sheet 40. Furthermore, in the dorsal waist portion 30, which has an extension portion 30E below the side joint portion SS, and which differs from Figure 2, if an elastic member aligning with the left-right direction is also arranged in the extension portion 30E, the extension portion 30E may also be made of the elastic sheet 40.

[0101] Furthermore, the stretchable sheet 40 is not limited to being applied to the waist portions 20 and 30 of the pant-type diaper 1, but may also be applied to other parts of the diaper 1, such as the stretchable parts around the legs. In addition, the stretchable sheet 40 may be applied to absorbent articles other than the pant-type diaper 1 (for example, tape-type diapers, urine pads, sanitary products, etc.), or to products other than absorbent articles (for example, cleaning materials, masks, etc.).

[0102] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention can be modified and improved without departing from its spirit, and it goes without saying that equivalents thereof are included. [Explanation of Symbols]

[0103] 1. Diapers (pants-type absorbent items), 10 Absorbent body, 11 Absorbent core, 12 Top sheet, 13 Back seat, 14 Exterior seat, 15 Leg elastic components, 16. Leak-proof wall elastic member, 20. Ventral girth area (girth area), 21 Skin-side sheet (sheet), 22 Non-skin-side sheet (sheet), 23. Elastic member around the waist (elastic member) 30 Dorsal girth section (girth section), 30E Extension section, 31 Skin-side sheet (sheet), 32 Non-skin-side sheet (sheet), 33. Elastic member around the torso (elastic member), 40 stretchable sheets, SS side joint, 50 Welded section, 50S Welded section pair, 51 First convex part, 52 Second convex part, 53 Third convex part, La is a virtual line (a line), Lb is a virtual line (another line), P1 1st intersection, P2 2nd intersection, 61 wrinkles, 62 wrinkles

Claims

1. It has intersecting vertical and horizontal directions, It has an absorbent body and a pair of waistband sections. A pant-type absorbent article having an elastic sheet provided on at least one of the pair of waist portions, The aforementioned stretchable sheet is oriented in the left-right direction, In the aforementioned stretchable sheet, multiple elastic members that are stretchable in the left-right direction are arranged between a pair of sheets joined by multiple welded portions, with spacing between them in the up-down direction. Each of the elastic members, when contracted in the left-right direction, is sandwiched between two adjacent welded portions in the vertical direction, thereby restricting its position in the left-right direction relative to the pair of sheets. The system has multiple rows of welded portions arranged in the vertical direction, The plurality of welding rows comprises a first welding row and a second welding row located adjacent to one side of the first welding row in the left-right direction, The first row of welded portions is convex to one side in the left-right direction and has adjacent first and second convex portions in the vertical direction. The second row of welded portions has a third convex portion that is convex to the other side in the left-right direction, In the state in which it is extended in the left-right direction, At least a portion of the welded portion located on the far other side in the left-right direction at the third protrusion is located on the far other side in the left-right direction than the line connecting the far other ends in the left-right direction of the welded portion located on the far one side in the left-right direction at each of the first and second protrusions, The stretchable sheet comprises a first welding region having a plurality of combinations of the first welding region and the second welding region that are adjacent to each other in the left-right direction. The stretchable sheet has a second welding region, In the second welding region, a plurality of rows of fourth welding portions, each having convex portions that alternately protrude on one side and the other side in the left-right direction, are arranged in the left-right direction. When the stretchable sheet is extended in the left-right direction, The fourth row of welding portions adjacent to each other in the left-right direction does not overlap in the left-right direction, or the length of the overlap in the left-right direction is less than or equal to the length in the left-right direction of the welding portion located on the side of the convex portion that is most convex in the left-right direction. The left-right spacing of the fourth welding row is narrower than the left-right spacing of the first welding row and the second welding row. The second welding region is located at the upper end of the girth portion over a predetermined width, A pant-type absorbent article characterized in that the first welding region is located below the second welding region.

2. The absorbent pant-type article according to claim 1, Each of the aforementioned rows of welded parts comprises a third row of welded parts located adjacent to one side of the second row of welded parts in the left-right direction, The third welding row has a fourth convex portion that is convex to the other side in the left-right direction, In the state in which the article is extended in the left-right direction, the welded portion located on the far other side in the left-right direction at the fourth protrusion is located on one side in the left-right direction relative to the line, characterized in that the pants-type absorbent article is characterized in that

3. A pant-type absorbent article according to claim 1 or 2, In the state in which it is extended in the left-right direction, A pant-type absorbent article characterized in that, at the third protrusion, more than half of the portion of the welded portion located furthest to the other side in the left-right direction is located further to the other side in the left-right direction than the line.

4. The absorbent pant-type article according to claim 3, In the state in which it is extended in the left-right direction, A pant-type absorbent article characterized in that the entirety of the welded portion located on the far other side in the left-right direction at the third protrusion is located on the far other side in the left-right direction relative to the line.

5. A pant-type absorbent article according to claim 1 or 2, In the state in which it is extended in the left-right direction, A pant-type absorbent article characterized in that the distance between the first and second welded sections in the left-right direction is 6 mm or more.

6. A pant-type absorbent article according to claim 1 or 2, The first protrusion is located above the second protrusion in the vertical direction, In the state in which it is extended in the left-right direction, Another line connecting the other ends in the left-right direction of the plurality of welded parts that constitute the second row of welded parts, The first intersection where the aforementioned other line and the aforementioned line intersect on the upper side, A second intersection where the aforementioned other line and the aforementioned line intersect at the lower side in the vertical direction, It has, A pant-type absorbent article characterized in that the vertical length from the other end of the welded portion located on the left-right side of the first protrusion to the first intersection is longer than the vertical length from the first intersection to the second intersection.

7. A pant-type absorbent article according to claim 1 or 2, The plurality of elastic members include a first elastic member and a second elastic member located adjacent to the first elastic member on the lower side in the vertical direction. A pant-type absorbent article characterized in that the lower of the two welded portions that sandwich the first elastic member in the vertical direction is discontinuous with the upper of the two welded portions that sandwich the second elastic member in the vertical direction.

8. The pant-type absorbent article according to claim 1 or 2, The pair of torso sections are joined together by a pair of side joints on both sides in the left-right direction. The first welding region is, At least a portion of the side joint on one side in the left-right direction overlaps with the left-right direction, A pant-type absorbent article characterized in that it overlaps with at least a portion of the side joint on the other side in the left-right direction.

Images