Pant-type disposable diapers

Abstract

To provide an underpants type disposable diaper which can suppress displacement of an interior body with respect to a wearer when an exterior body expands / contracts following movement of the wearer.SOLUTION: An underpants type disposable diaper comprises: an interior body 10 which has an absorber 13 that extends in the longitudinal direction L; an exterior body 20 which covers an end in the longitudinal direction L of the interior body 10 from the non-skin side and can expand / contract in the width direction W; and a joint sheet 30 which is arranged on the skin side with respect to at least the exterior body 20. A first joint region 31 which is joined to the interior body 10 and is not joined to the exterior body 20 and a second joint region 32 which is joined to the exterior body 20 and is not joined to the interior body 10 are set in the joint sheet 30. The interior body 10 and the exterior body 20 are connected with each other via the joint sheet 30.SELECTED DRAWING: Figure 2

Description

【Technical Field】 , , , 【0004】 , 【0006】 , , , , , , 【0005】 , , , , , , 【0001】 The present invention relates to a pants-type disposable diaper. 【Background Art】 【0002】 Conventionally, there is known a pants-type disposable diaper including an interior body having an absorber and an exterior body attached to the non-skin side of the interior body to surround the wearer's torso and being stretchable in the width direction, the interior body being detachably fixed to the exterior body (see, for example, Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2013-188424 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in a conventional pants-type disposable diaper, the interior body is fixed to the exterior body, and the exterior body and the interior body are integrated. Therefore, when the exterior body expands and contracts due to the movement of the wearer, the interior body moves following the expansion and contraction movement of the exterior body, and the position of the interior body may shift with respect to the skin of the wearer. 【0005】 The present invention has been made paying attention to the above problems, and an object thereof is to provide a pants-type disposable diaper capable of suppressing the displacement of the interior body with respect to the wearer when the exterior body expands and contracts due to the movement of the wearer. 【Means for Solving the Problems】 【0006】 To achieve the above objective, the present invention provides an inner body having an absorbent material extending in the longitudinal direction, where the direction extending from the ventral side to the dorsal side of the wearer is the longitudinal direction, the direction perpendicular to the longitudinal direction is the width direction, and the directions perpendicular to the longitudinal direction and the width direction are the thickness direction, and where the side closer to the wearer when worn is the skin side and the side closer to the underwear when worn is the non-skin side in the thickness direction, the present invention provides an inner body having an absorbent material extending in the longitudinal direction, an outer body that covers the longitudinal end of the inner body from the non-skin side and is expandable in the width direction, and a bonding sheet that is positioned at least closer to the skin side than the outer body. The interior body is not joined to the exterior body at least on both sides in the width direction. The bonding sheet has a first bonding region that is bonded to the interior body but not to the exterior body, and a second bonding region that is bonded to the exterior body but not to the interior body. A non-joined region that is not joined to either the interior body or the exterior body, The interior body and the exterior body are connected via the connecting sheet. The non-jointed region is set between the first jointed region and the second jointed region, and is deformable in the width direction as the exterior expands and contracts. This configuration was adopted. [Effects of the Invention] 【0007】 As a result, the disposable pant-type diaper of the present invention can prevent the inner diaper from shifting relative to the wearer when the outer diaper expands or contracts due to the wearer's movement. [Brief explanation of the drawing] 【0008】 [Figure 1] This is an exploded view showing the pant-type disposable diaper of Example 1. [Figure 2] This is a cross-sectional view of AA in Figure 1. [Figure 3] This is a cross-sectional view of BB in Figure 1. [Figure 4] This is an external view showing the pant-type disposable diaper of Example 1. [Figure 5] This is an explanatory diagram showing the setting position of the side region in Example 1. [Figure 6] This is an explanatory diagram showing the position of the lateral region when the outer casing is in its natural length state and when the outer casing is in its extended state. [Figure 7] This is an exploded view of the main parts of the pant-type disposable diaper of Example 2. [Figure 8]Figure 7 is a cross-sectional view of CC. [Figure 9] This is a diagram showing the first modified example of a pant-type disposable diaper. [Figure 10] This is a diagram showing a second modified example of a disposable diaper in the form of pants. [Modes for carrying out the invention] 【0009】 The embodiments for implementing the pant-type disposable diaper according to the present invention are described below based on the examples 1 and 2 shown in the drawings. In the following description, the direction extending from the wearer's ventral side to the dorsal side is referred to as the "longitudinal direction L," and the direction perpendicular to the longitudinal direction L is referred to as the "width direction W." Furthermore, the direction perpendicular to both the longitudinal direction L and the width direction W is referred to as the "thickness direction H." In addition, in the thickness direction H, the side closer to the wearer's body when worn is referred to as the "skin side," and the side closer to the underwear when worn is referred to as the "non-skin side." 【0010】 (Example 1) The disposable pant-type diaper of Example 1 (hereinafter referred to as "paper pant 1") comprises an inner body 10, an outer body 20, and a bonding sheet 30, as shown in Figure 1. 【0011】 As shown in Figure 1, the interior casing 10 has a rectangular shape extending in the longitudinal direction L when viewed from the thickness direction H in a plan view. As shown in Figure 2, the interior casing 10 comprises a top sheet 11, a back sheet 12, an absorbent 13, and a pair of gathered sheets 14 (see Figure 1). The interior casing 10 is formed by sandwiching the absorbent 13 between the top sheet 11 and the back sheet 12, with a pair of gathered sheets 14 positioned on both sides in the width direction W, and fixing appropriate areas such as the periphery with heat welding, ultrasonic welding, hot melt adhesive, etc. 【0012】 The top sheet 11 is a sheet material placed on the skin side. The top sheet 11 has liquid permeability, which is the property of allowing bodily fluids to pass through, and allows bodily fluids to pass through quickly towards the absorbent 13. The top sheet 11 is formed of, for example, a liquid permeable nonwoven fabric. 【0013】 The backsheet 12 is a sheet material disposed on the non-skin side. The backsheet 12 has liquid impermeability which is a property of not allowing liquids to permeate, preventing the permeation of body fluids held by the absorber 13 and preventing wetting of clothing and the like. The backsheet 12 is formed of, for example, a resin film or the like. 【0014】 The absorber 13 is a liquid absorbent material sandwiched between the topsheet 11 and the backsheet 12. The absorber 13 is composed of, for example, absorbent polymer particles and pulp fibers, and may be wrapped by a core wrap sheet (not shown) made of crepe paper, non-woven fabric or the like. The absorber 13 has an outer shape smaller than the topsheet 11 and the backsheet 12. The absorber 13 may be single-layer or multi-layer. 【0015】 The pair of gather sheets 14 are elongated sheet materials extending in the longitudinal direction L, and are disposed on both sides in the width direction W of the absorber 13. The gather sheets 14 are formed of, for example, a water-repellent or liquid-impermeable non-woven fabric or the like. For example, one end in the width direction W of the gather sheet 14 is fixed to the non-skin side of the backsheet 12 by an adhesive such as hot melt, and the other end in the width direction W is a free end. And a three-dimensional gather elastic member 14a that can expand and contract in the longitudinal direction L is provided at the other end in the width direction W of the gather sheet 14 which is the free end in a predetermined expanded state. 【0016】 The three-dimensional gather elastic member 14a is composed of, for example, a plurality of thread-like or belt-like synthetic rubbers arranged in the width direction W and expanding and contracting in the longitudinal direction L. The gather sheet 14 contracts due to the expansion and contraction force of the three-dimensional gather elastic member 14a and stands up toward the wearer to form a wall-like three-dimensional gather 15. That is, the interior body 10 is disposed on both sides in the width direction W of the absorber 13, extends in the longitudinal direction L, and has a three-dimensional gather 15 that stands up from the topsheet 11 to the skin side of the wearer. The paper pants 1 suppress lateral leakage of body fluids from both sides in the width direction W of the absorber 13 by the three-dimensional gather 15. 【0017】 As shown in FIG. 2, the outer body 20 covers both end portions of the inner body 10 in the longitudinal direction L from the non-skin side. Here, the outer body 20 has a rectangular shape that is long in the width direction W in a plan view, and extends outward in the longitudinal direction L and the width direction W from the inner body 10 (see FIG. 1). Further, both side portions 21a and 21b in the width direction W of the outer body 20 (hereinafter referred to as the "first outer body 21") at one end portion (ventral side) in the longitudinal direction L of the inner body 10 and both side portions 22a and 22b in the width direction W of the outer body 20 (hereinafter referred to as the "second outer body 22") at the other end portion (dorsal side) in the longitudinal direction L of the inner body 10 are joined by thermal welding, ultrasonic welding, or the like, respectively. As a result, as shown in FIG. 4, the paper pants 1 are formed into a pants shape having a waist opening 2 for passing through the wearer's torso and a pair of leg openings 3 for passing through the wearer's legs. 【0018】 Note that the outer body 20 of Example 1 is provided separately at both end portions of the inner body 10 in the longitudinal direction L, that is, the ventral side and the dorsal side, and is a two-piece type composed of the first outer body 21 on the ventral side and the second outer body 22 on the dorsal side. Therefore, when the paper pants 1 are formed into a pants shape, the inner body 10 is exposed at the portion covering the wearer's crotch (see FIG. 4). 【0019】 As shown in FIGS. 2 and 3, the outer body 20 (the first outer body 21 and the second outer body 22) has an inner sheet material 23a, an outer sheet material 23b, and a shirring elastic material 24 provided therebetween. 【0020】 The inner sheet material 23a and the outer sheet material 23b are sheet materials made of a non-woven fabric or the like having a liquid-impermeable property that does not allow liquid to permeate. Note that the inner sheet material 23a and the outer sheet material 23b may be composed of individual sheet materials or may be composed of a common single sheet material. When the inner sheet material 23a and the outer sheet material 23b are composed of a single sheet material, for example, a single sheet material is folded back to form the inner sheet material 23a and the outer sheet material 23b. 【0021】 The shirring elastic material 24 is an expandable member that can expand and contract in the width direction W. The shirring elastic material 24 is fixed to the inner sheet material 23a and the outer sheet material 23b in a predetermined stretched state, and when it contracts back to its natural length, it causes the inner sheet material 23a and the outer sheet material 23b to contract. The "natural length" refers to the length of the shirring elastic material 24 when no external load is applied to it. Therefore, the outer body 20 is contracted in its natural length state and stretches when pulled outward in the width direction W. The outer body 20 then expands and contracts in the width direction W as the shirring elastic material 24 expands and contracts, fitting around the wearer's waist. Furthermore, as shown in Figure 4, the shirring elastic material 24 is provided on the entire surface of the outer body 20. 【0022】 In Example 1, the shearing stretch material 24 is composed of multiple elongated elastic materials such as elastic threads arranged in parallel in the longitudinal direction L and stretching in the width direction W. However, the shearing stretch material 24 can be made of elastic materials other than elongated elastic materials such as elastic threads, such as strip-shaped, mesh-shaped, or film-shaped elastic materials. 【0023】 The bonding sheet 30 is a sheet material positioned at least on the skin side of the outer casing 20. In Example 1, as shown in Figure 1, the bonding sheet 30 has a long rectangular shape in the width direction W when viewed from above. Here, the length L of the bonding sheet 30 is set to be shorter than that of the outer casing 20. In addition, the outer edge of the bonding sheet 30 in the length direction L is aligned with the outer edge of the outer casing 20 in the length direction L and extends outward in the length direction L beyond that of the inner casing 10 (see Figure 1). Furthermore, the length W of the bonding sheet 30 in the width direction is set to be approximately the same as that of the outer casing 20 and extends outward in the width direction W beyond that of the inner casing 10. Note that in Example 1, the length L of the bonding sheet 30 in the length direction L is shorter than that of the outer casing 20, but it may be set to be approximately the same length. 【0024】 Furthermore, in the paper pants 1 of Example 1, the bonding sheet 30 is positioned closer to the skin than the inner body 10 and outer body 20. The bonding sheet 30 covers both ends of the inner body 10 in the longitudinal direction L from the skin side, and in a plan view, the portion that extends beyond the inner body 10 faces the skin side of the outer body 20. As a result, the ends of the inner body 10 in the longitudinal direction L are sandwiched between the outer body 20 and the bonding sheet 30 (see Figure 2). 【0025】 Furthermore, the bonding sheet 30 has liquid impermeability or water repellency, which means it does not allow liquid to pass through, and it does not have elasticity. The bonding sheet 30 can be the same as the inner sheet material 23a and outer sheet material 23b that make up the outer casing 20, for example. 【0026】 In Example 1, the bonding sheet 30 is made of a sheet material separate from the outer casing 20, but it may also be formed from a part of the outer casing 20. That is, when the bonding sheet 30 is formed from a part of the outer casing 20, the inner sheet material 23a or the outer sheet material 23b of the outer casing 20, or both, have their outer ends in the longitudinal direction L folded towards the skin and placed over the inner casing 10 to form the bonding sheet 30. In this case, the shearing stretch material 24 is not provided in the part that becomes the bonding sheet 30. 【0027】 The bonding sheet 30 is configured with a first bonding region 31, a second bonding region 32, and a non-bonding region 33. 【0028】 The first joining region 31 is an area that is joined to the interior body 10 but not to the exterior body 20. The second joining region 32 is an area that is joined to the exterior body 20 but not to the interior body 10. The non-joining region 33 is an area that is not joined to either the interior body 10 or the exterior body 20. 【0029】 The entire surface of the first bonding region 31 of the bonding sheet 30 is uniformly bonded to the interior body 10 via bonding means α (see Figure 2), such as heat welding, ultrasonic welding, or adhesives such as hot melt. Furthermore, the entire surface of the second bonding region 32 of the bonding sheet 30 is uniformly bonded to the exterior body 20 via bonding means α (see Figure 2), such as heat welding, ultrasonic welding, or adhesives such as hot melt. As a result, the interior body 10 and the exterior body 20 are indirectly connected via the bonding sheet 30 and are not directly connected. 【0030】 Furthermore, the first joining region 31 is set at an arbitrary position that overlaps with the interior body 10 in a plan view, and in Embodiment 1, it has an end region 31a and a pair of gathered regions 31b. 【0031】 The end region 31a is a region that extends in the width direction W along the longitudinal edge 10a of the interior body 10. In Embodiment 1, the end region 31a is set continuously over the entire length of the interior body 10 in the width direction W. 【0032】 The gathered region 31b is a region set in a position that overlaps with the pair of three-dimensional gathers 15 of the interior body 10 in a plan view. In Embodiment 1, the end region 31a and the gathered region 31b are set apart, but for example, the gathered region 31b may be set continuously from the end region 31a. 【0033】 The second joining region 32 is set at an arbitrary position that overlaps the outer casing 20 in a plan view, and in Embodiment 1, it has a peripheral region 32a and a side region 32b. 【0034】 The peripheral region 32a is a region that extends in the width direction W along the outer edge 21c (22c) in the longitudinal direction L of the outer casing 20, and also extends in the longitudinal direction L along both sides 21a, 21b (22a, 22b) in the width direction W of the outer casing 20. In Embodiment 1, the peripheral region 32a is set continuously over the entire length of the bonding sheet 30 in both the longitudinal direction L and the width direction W. 【0035】 The side region 32b is a region set at the inner end 30a in the longitudinal direction L of the bonding sheet 30. Here, when the outer body 20 is in its natural length state, the side region 32b is set in a position where at least a portion of it overlaps with the non-skin side of the inner body 10 in a plan view, as shown in Figure 5. In other words, as the shearing expansion material 24 contracts, the outer body 20 and the bonding sheet 30 flex, causing at least a portion of the side region 32b to penetrate into the non-skin side of the inner body 10. 【0036】 Figure 1 shows the outer casing 20 in an extended state, where the side region 32b does not overlap the inner casing 10. Furthermore, in the embodiment 1 shown in Figure 1, an example is shown where the side region 32b is approximately square in a plan view. However, the shape of the side region 32b can be arbitrarily set, and may be circular, or a rectangle elongated in the width direction W, for example. 【0037】 Furthermore, as shown by the solid line in Figure 6, the distance along the width direction W from the end 10b of the interior body 10 in the width direction W to the side region 32b when the exterior body 20 is at its natural length is defined as the "first distance LN". Also, as shown by the dashed line in Figure 6, the distance from the end 10b of the interior body 10 in the width direction W to the side region 32b when the exterior body 20 is extended outward in the width direction W is defined as the "second distance LE". The side region 32b is set between the position P1 where the first distance LN is zero and the position P2 where the first distance LN is half of the second distance LE when the exterior body 20 is at its natural length, as shown in Figure 5. 【0038】 The non-joined region 33 is the region of the bonding sheet 30 other than the first bonding region 31 and the second bonding region 32. In Example 1, a portion of the non-joined region 33 is set between the first bonding region 31 and the second bonding region 32 in a plan view. 【0039】 The function of paper pants 1 in Example 1 is explained below. 【0040】 To wear the paper pants 1 of Example 1, the wearer inserts both legs into the leg openings 3 and pulls up the outer body 20 by holding the waist opening 2. At this time, the wearer adjusts the position of the inner body 10 so that it is in contact with the crotch area (the area where urination occurs) while putting on the pants. 【0041】 Here, the outer body 20 is expandable and contractible in the width direction W, and expands and contracts in accordance with the wearer's movements. In contrast, in the paper pants 1 of Embodiment 1, the inner body 10 and the outer body 20 are connected via a bonding sheet 30 which has a first bonding region 31 that is bonded to the inner body 10 but not to the outer body 20, and a second bonding region 32 that is bonded to the outer body 20 but not to the inner body 10. In other words, the inner body 10 is not directly bonded to the outer body 20, but is supported by the bonding sheet 30. 【0042】 As a result, in the paper pants 1 of Example 1, when the outer body 20 expands or contracts, the second bonding region 32 of the bonding sheet 30 deforms integrally with the outer body 20, while the first bonding region 31 of the bonding sheet 30 does not deform. Therefore, the movement of the outer body 20 is prevented or suppressed from being transmitted to the inner body 10, and the position of the inner body 10 relative to the wearer is easily maintained. In other words, the position of the inner body 10 becomes less affected by the contraction of the outer body 20. As a result, the paper pants 1 of Example 1 can suppress the displacement of the inner body 10 relative to the wearer when the outer body 20 expands or contracts in conjunction with the wearer's movements. 【0043】 Furthermore, as described above, in the paper pants 1 of Example 1, the inner lining 10 is not directly joined to the outer lining 20, so the inner lining 10 does not shrink together with the outer lining 20. Therefore, the paper pants 1 of Example 1 does not require the shirring stretch material 24 to be broken in order to prevent the shrinkage of the inner lining 10. Note that "breaking the shirring stretch material 24" is a process that inhibits the stretching force of the shirring stretch material 24. The breaking process is performed, for example, by forming a large number of fine through holes in the inner sheet material 23a and outer sheet material 23b to which the shirring stretch material 24 is fixed, and breaking the shirring stretch material 24 through the through holes. 【0044】 In Example 1, the paper pants 1 do not require the shirring elastic material 24 to be cut, so the shirring elastic material 24 is uniformly distributed across the entire surface of the outer body 20, as shown in Figure 4. Therefore, the outer body 20 can stretch uniformly across its entire surface, improving the appearance of the paper pants 1. 【0045】 Furthermore, in the paper pants 1 of Example 1, the bonding sheet 30 has a non-bonding area 33 between the first bonding area 31 and the second bonding area 32 in a plan view, which is not bonded to either the inner body 10 or the outer body 20. 【0046】 Here, since the non-jointed region 33 is not joined to either the inner body 10 or the outer body 20, it can be freely deformed without being affected when the outer body 20 expands or contracts. Therefore, when the outer body 20 expands or contracts in accordance with the movement of the wearer of the paper pants 1, even if the second jointed region 32 is pulled by the outer body 20 and its position changes, the non-jointed region 33 deforms, and the position of the first jointed region 31 joined to the inner body 10 is suppressed from changing. In other words, the jointed sheet 30 of Example 1 has a non-jointed region 33 between the first jointed region 31 and the second jointed region 32, which allows for a freely deformable margin. As a result, the paper pants 1 of Example 1 can further suppress the displacement of the inner body 10 in accordance with the wearer's movements. 【0047】 Furthermore, in the paper pants 1 of Example 1, the bonding sheet 30 is positioned on the skin side of the inner body 10 and outer body 20, and the inner body 10 is sandwiched between the outer body 20 and the bonding sheet 30. The outer body 20 and the bonding sheet 30 extend outward in the width direction W from the inner body 10, and the second bonding region 32 set on the bonding sheet 30 has a side region 32b set at the inner end 30a in the longitudinal direction L of the bonding sheet 30. Moreover, the side region 32b is set to overlap the non-skin side of the inner body 10 when the outer body 20 is in its natural length state. 【0048】 Therefore, when the outer body 20 extends outward in the width direction W, the side portion 32b of the bonding sheet 30 is pulled outward in the width direction W from the non-skin side of the inner body 10 (see Figure 6). As a result, the paper pants 1 of Example 1 can have a portion of the bonding sheet 30 that deforms in the width direction W as the outer body 20 expands and contracts, and the paper pants 1 of Example 1 can prevent the inner body 10 from moving together with the outer body 20. 【0049】 Furthermore, in the paper pants 1 of Example 1, the side region 32b is set between a position P1 where the first distance LN is zero and a position P2 where the first distance LN is half the length of the second distance LE. The "first distance LN" is the distance from the end 10b in the width direction W of the inner body 10 to the side region 32b when the outer body 20 is in its natural length state. The "second distance LE" is the distance from the end 10b in the width direction W of the inner body 10 to the side region 32b when the outer body 20 is in its extended state. 【0050】 As a result, in the paper pants 1 of Example 1, when the outer body 20 is in its natural length state, the side region 32b can be prevented from extending too far into the non-skin side of the inner body 10 (the bonding sheet 30 being wrapped around the skin) (see Figure 5). Therefore, the paper pants 1 of Example 1 limits the amount of excess material that the bonding sheet 30 deforms in the width direction W as the outer body 20 expands and contracts, and the relative range of movement between the outer body 20 and the inner body 10 can be kept within an appropriate range. Thus, the wearer can easily position the inner body 10 in the appropriate position when putting on the paper pants 1. 【0051】 Furthermore, in the paper pants 1 of Example 1, the inner lining 10 is positioned on both sides of the absorbent material 13 in the width direction W and has three-dimensional gathers 15 that extend in the longitudinal direction L and stand upright toward the wearer. The bonding sheet 30 is positioned on the skin side of the inner lining 10 and the outer lining 20, and the first bonding region 31 has an end region 31a that extends in the width direction W along the edge 10a in the longitudinal direction L of the inner lining 10, and a gathered region 31b that is set to overlap with the three-dimensional gathers 15. 【0052】 Then, in the first joining region 31, the joining sheet 30 is joined to the inner body 10, so that the joining sheet 30 covers the end of the inner body 10 in the longitudinal direction L and forms a pocket space that is open inward in the longitudinal direction L. That is, the end region 31a joins the edge 10a of the inner body 10 in the longitudinal direction L to the joining sheet 30, suppressing leakage of bodily fluids from the edge 10a of the inner body 10 in the longitudinal direction L. In addition, the gathered region 31b joins the three-dimensional gather 15 to the joining sheet 30, suppressing leakage of bodily fluids from both sides of the inner body 10 in the width direction W. For this reason, the paper pants 1 of Example 1 can suppress leakage of bodily fluids flowing on the top sheet 11 of the inner body 10. 【0053】 (Example 2) The disposable pant-type diaper in Example 2 (hereinafter referred to as "paper pant 1A") comprises an inner body 10, an outer body 20, and a bonding sheet 30, as shown in Figure 7. 【0054】 In the paper pants 1A of Example 2, the inner lining 10, outer lining 20, and bonding sheet 30 have the same configuration as the inner lining 10, outer lining 20, and bonding sheet 30 in the paper pants 1 of Example 1, so they are denoted by the same reference numerals and detailed explanations are omitted. 【0055】 In other words, in the paper pants 1A of Example 2, the non-skin sides of both ends of the inner body 10 in the longitudinal direction L are covered by an outer body 20 that is expandable in the width direction W, and a bonding sheet 30 is placed on the skin side of both the inner body 10 and the outer body 20. The bonding sheet 30 has a first bonding region 31 that is bonded to the inner body 10, a second bonding region 32 that is bonded to the outer body 20, and a non-bonding region 33, and the inner body 10 and the outer body 20 are connected via the bonding sheet 30. The first bonding region 31 has an end region 31a and a gathered region 31b. Furthermore, the second bonding region 32 has a peripheral region 32a and a side region 32b. 【0056】 In the paper pants 1A of Example 2, a third joining region 40 is set in the center of the width direction W of the inner lining 10, which is joined to the outer lining 20. In other words, the inner lining 10 and the outer lining 20 of Example 2 are directly joined at the third joining region 40 via joining means α such as heat welding, ultrasonic welding, or adhesives such as hot melt (see Figure 8). 【0057】 Here, the third joining region 40 extends along the longitudinal direction L and is set in the portion where the interior body 10 overlaps with the exterior body 20 in a plan view. The length W1 in the width direction W of the third joining region 40 can be set arbitrarily, but a shorter length is preferable. 【0058】 As a result, in the paper pants 1A of Example 2, the central part of the inner lining 10 in the width direction W is fixed to the outer lining 20, preventing the inner lining 10 from rolling up towards the skin. Furthermore, in the paper pants 1A of Example 2, because the third joining region 40 is set in the central part of the inner lining 10 in the width direction W, the contraction of the inner lining 10 that follows the contraction of the outer lining 20 can be suppressed. Therefore, the paper pants 1A of Example 2 can ensure that the inner lining 10 is in proper contact with the wearer. 【0059】 Furthermore, in the paper pants 1A of Example 2, by shortening the length W1 in the width direction W of the third bonding region 40, the shrinkage of the inner body 10 that follows the shrinkage of the outer body 20 can be suppressed. 【0060】 Furthermore, in the paper pants 1A of Example 2, the third joining region 40 extends continuously along the entire length in the longitudinal direction L in the portion where the inner body 10 overlaps with the outer body 20. However, the third joining region 40 may be arranged intermittently along the longitudinal direction L. 【0061】 The disposable pant-type diapers of the present invention have been described above based on Examples 1 and 2. However, the specific configuration is not limited to these examples, and changes or additions to the design are permitted as long as they do not depart from the gist of the invention as described in each claim. 【0062】 In the paper pants 1 of Example 1, an example was shown in which the bonding sheet 30 extends outward from the inner lining 10 in both the longitudinal direction L and the width direction W. However, as in the first modified example of the pants-type disposable diaper 1B shown in Figure 9, for example, the bonding sheet 30 may extend outward from the inner lining 10 only in the longitudinal direction L, and the length of the bonding sheet 30 in the width direction W may be set to be approximately the same as the length of the inner lining 10 in the width direction W. 【0063】 Furthermore, as in the first modified example, the pant-type disposable diaper 1B, the first joining region 31 set on the joining sheet 30 extends in the width direction W along the longitudinal edge 10a of the inner body 10, and does not necessarily have to have a gathered region 31b. 【0064】 Furthermore, as in the first modified example of the pant-type disposable diaper 1B, the second joining region 32 set on the joining sheet 30 may only extend in the width direction W along the outer edge 21c (22c) in the longitudinal direction L of the outer casing 20. Also, the second joining region 32 may not have a side region 32b. 【0065】 In other words, the first bonding region 31 can be set at any position as long as the bonding sheet 30 and the interior body 10 directly overlap in the thickness direction H, and its size and shape can also be set arbitrarily. Similarly, the second bonding region 32 can be set at any position as long as the bonding sheet 30 and the exterior body 20 directly overlap in the thickness direction H, and its size and shape can also be set arbitrarily. 【0066】 In particular, the first joining regions 31 may be set in multiple locations along the width direction W at predetermined intervals, as in the second modified example of the pant-type disposable diaper 1C shown in Figure 10. In this case, the spaces between the first joining regions 31 become gaps that lead to the outside of the inner lining 10, provided at the ends of the inner lining 10 in the longitudinal direction L. Therefore, the second modified example of the pant-type disposable diaper 1C can improve breathability. 【0067】 Although not shown in the figures, the joining sheet 30 may extend only outward in the width direction W from the interior body 10, and the length L of the joining sheet 30 in the longitudinal direction may be set to a length such that it does not extend outward beyond the interior body 10. 【0068】 Furthermore, in Example 1, the bonding sheet 30 was positioned on the skin side of the inner body 10 and the outer body 20, and an example was shown in which the inner body 10 was sandwiched between the outer body 20 and the bonding sheet 30. However, the bonding sheet 30 only needs to be positioned on the skin side of the outer body 20 at least. That is, the bonding sheet 30 may, for example, be positioned on the non-skin side of the inner body 10 and sandwiched between the inner body 10 and the outer body 20. 【0069】 Furthermore, in the paper pants 1 of Example 1, the outer casing 20 is provided separately at both ends in the longitudinal direction L of the inner casing 10, and is shown as a two-part type consisting of a first outer casing 21 on the ventral side and a second outer casing 22 on the dorsal side. However, the outer casing 20 may also be of a type that integrally covers the non-skin side of the inner casing 10 from one end (ventral side) to the other end (dorsal side) in the longitudinal direction L. In this case, the middle part of the inner casing 10 in the longitudinal direction L does not have to be joined to the outer casing 20 at all, or a part of it may be joined to the outer casing 20. [Explanation of Symbols] 【0070】 1. Paper pants (disposable diapers in the style of pants) 10 Interior components 13 Absorbent 20 Exterior 30 bonding sheets 31 1st junction area 32 Second joint area L Longitudinal direction W (width direction)

Claims

[Claim 1] When the direction extending from the wearer's ventral side to the dorsal side is defined as the longitudinal direction, the direction perpendicular to the longitudinal direction is defined as the width direction, and the directions perpendicular to both the longitudinal and width directions are defined as the thickness direction, and when the side closer to the wearer during wear is defined as the skin side in the thickness direction, and the side closer to the underwear during wear is defined as the non-skin side, An interior body having an absorbent extending in the longitudinal direction, An outer body that covers the longitudinal end of the interior body from the non-skin side and is expandable and contractible in the width direction, The system comprises at least a bonding sheet positioned on the skin side of the outer casing, The interior body is not joined to the exterior body at least on both sides in the width direction. The bonding sheet has a first bonding region that is bonded to the interior body but not to the exterior body, a second bonding region that is bonded to the exterior body but not to the interior body, and a non-bonding region that is not bonded to either the interior body or the exterior body, and the interior body and the exterior body are connected via the bonding sheet. The non-jointed region is set between the first jointed region and the second jointed region, and is deformable in the width direction as the exterior expands and contracts. A pant-type disposable diaper characterized by the following features. [Claim 2] In the pant-type disposable diaper described in Claim 1, The bonding sheet is positioned on the skin side of the interior body, The exterior body and the joining sheet extend outward in the width direction compared to the interior body. The second joining region is set at the inner end of the joining sheet in the longitudinal direction and has a side region that overlaps the non-skin side of the inner body when the outer body is in its natural length state. A pant-type disposable diaper characterized by the following features. [Claim 3] In the pant-type disposable diaper described in Claim 2, When the outer casing is in its natural length state, the distance from the end of the inner casing in the width direction to the side region is defined as the first distance, and when the outer casing is in its extended state, the distance from the end of the inner casing in the width direction to the side region is defined as the second distance. The side region is set between a position where the first distance is zero and a position where the first distance is half the length of the second distance. A pant-type disposable diaper characterized by the following features. [Claim 4] In the pant-type disposable diaper described in claim 1 or claim 2, The bonding sheet is positioned on the skin side of the interior body, The interior lining is positioned on both sides of the absorbent body in the width direction and has three-dimensional gathers that extend in the longitudinal direction and stand upright toward the wearer. The first joining region includes an end region extending in the width direction along the longitudinal edge of the interior body, and a gathered region set to overlap with the three-dimensional gather. A pant-type disposable diaper characterized by the following features. [Claim 5] In the pant-type disposable diaper described in claim 1 or claim 2, The bonding sheet is positioned on the skin side of the interior body, The interior body has a third joining region set in the center in the width direction, which is joined to the exterior body. A pant-type disposable diaper characterized by the following features. [Claim 6] In the pant-type disposable diaper described in claim 1 or claim 2, Multiple first joining regions are set at predetermined intervals along the width direction. A pant-type disposable diaper characterized by the following features.

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