JP2017205157A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper which can stand by itself on a plane.SOLUTION: An underpants type disposable diaper comprises: a liquid absorbent absorber comprising a vertical direction and a lateral direction which crosses the vertical direction; a belly side waistline part which is positioned on one side of a longitudinal direction of the absorber, and positioned on a belly side of a wearer when being worn by the wearer; and a back side waistline part which is positioned on the other side of the longitudinal direction of the absorber, and which is positioned on a back side of the wearer when being worn by the wearer. The absorber comprises a pair of high rigidity parts which are provided at a prescribed interval in the lateral direction, and have rigidity higher than that of other areas along the longitudinal direction, and a pair of leakage prevention walls along the longitudinal direction are provided on outside of the absorber in the lateral direction, and the leakage prevention walls comprise respectively, a junction where surfaces on one side of the thickness direction are jointed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pants-type disposable diaper.

  Conventionally, pants-type disposable diapers have been used. A general pants-type disposable diaper is provided with an absorptive main body having an absorbent body that absorbs excrement and has a longitudinal direction and a width direction in a deployed state. And the leak prevention wall part which prevents the excrement absorbed by the absorber from leaking outside the diaper is provided on both sides in the width direction of the absorbent main body along the circumference of the wearer's leg. For example, in Patent Document 1, a leak-proof cuff (leak-proof wall portion) is provided on both sides of a main body (absorbent main body), and the anti-proof is provided at an intermediate portion that is a region that is applied to the wearer's thigh when worn. Disclosed is a disposable diaper in which the leak-proof cuff is less likely to protrude to the outside (side of the diaper) by reducing the length of the leakage cuff that can stand up, and side leakage is easily prevented.

JP 2005-218876 A

  When a wearer wears a pant-type diaper having a leak-proof wall as described in Patent Document 1, the pant-type diaper will be put on while the wearer is lying down (that is, sleeping) Then, the leak-proof wall may be crushed or the position may be shifted, which may cause problems such as excrement leakage and poor fit. Moreover, the operation | work which equips a sleeping wearer with a pants-type diaper increases the load of a caregiver etc. In order to make it difficult for such problems to occur, there is a desire to be able to easily put on a pants-type diaper while the wearer is standing.

  For example, it is effective to let the leg pass from the waistline opening of the pant-type diaper to the leg-hole opening in a state where the wearer is standing, and to raise the pant-type diaper so as to put on the underwear and attach it to the wearer's body. At that time, if the pants-type diaper is left standing on a flat surface (for example, the floor) and the wearer's legs can be inserted from above, the wearer and the caregiver can perform the diaper wearing operation without difficulty. , It becomes easy to suppress crushing and displacement of the leak-proof wall. However, since a pants-type disposable diaper is usually formed using a flexible sheet member such as a nonwoven fabric, it is difficult to stand on a flat surface such as a floor.

This invention is made | formed in view of the above conventional problems, The objective is to provide the underpants type disposable diaper which can be made to stand on a plane.
There is.

The main invention for achieving the above object has a longitudinal direction and a transverse direction intersecting the longitudinal direction, and is disposed on one end side in the longitudinal direction of the liquid absorbent and the absorbent body, A ventral waistline portion positioned on the abdomen side of the wearer when worn, and a backside waistline portion disposed on the other end side in the longitudinal direction of the absorber and positioned on the back side of the wearer when worn And a pair of high sized diapers having a predetermined interval in the lateral direction and having higher rigidity than other regions along the longitudinal direction. A rigid portion is provided, and has a pair of leak-proof walls along the longitudinal direction on the outer side of the absorber in the lateral direction, and the leak-proof walls have surfaces on one side in the thickness direction. A pants-type disposable diaper characterized by having a joined portion joined.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the underpants type disposable diaper which can be made to stand on a plane can be provided.

It is a top view of the diaper 1 which is an unfolded and extended state. It is the schematic perspective view which looked at the diaper 1 from the ventral side. It is a schematic plan view of the absorptive main body 10 which is an unfolded and extended state. 3A is a schematic cross-sectional view taken along line AA in FIG. 3B is a schematic cross-sectional view taken along the line BB in FIG. 1A. 3C is a schematic cross-sectional view taken along the line CC in FIG. 1A. It is a top view of the leak-proof wall 50 which is an expanded and extended state. It is a schematic sectional drawing expanding and expressing about field D of Drawing 3C. It is a figure explaining the wearing state of the diaper 1 before excretion is performed. It is a figure explaining the wearing state of the diaper 1 after excretion is performed. It is a perspective view showing the state where the diaper 1 became independent. It is the side view which looked at the state where the diaper 1 became independent from the side. It is the schematic sectional drawing showing the state of the absorber 11 and the leak-proof wall 50 at the time of seeing from the front-back direction in the state which made the diaper 1 self-supporting. It is the schematic sectional drawing showing the state of the absorber 11 and the leak-proof wall 50 at the time of seeing from the horizontal direction (left-right direction) in the state which made the diaper 1 self-supporting.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
It has a longitudinal direction and a transverse direction intersecting the longitudinal direction, and is disposed on one end side in the longitudinal direction of the liquid absorbent and the absorbent body, and is positioned on the stomach side of the wearer when worn A pants-type disposable diaper comprising: an abdomen waistline part to be placed; and a backside waistline part located on the back side of the wearer when worn on the other end side in the longitudinal direction of the absorber. The absorbent body is provided with a pair of high-rigidity portions having a predetermined interval in the lateral direction and having higher rigidity than the other regions along the longitudinal direction. And a pair of leak-proof walls along the longitudinal direction on the outer side of the absorber, and the leak-proof wall has a joint part in which surfaces on one side in the thickness direction are joined to each other. A pants-type disposable diaper.

  According to such a pants-type disposable diaper, when the absorber is deformed in a substantially arc shape in the lateral direction, the lateral central region sandwiched between the pair of high-rigidity portions can maintain a planar shape. By installing the plane portion of the central region in the lateral direction on a plane such as a floor, the diaper can easily stand on its own. And a joint part is formed along the longitudinal direction of the leak-proof wall standing up from both lateral outer sides of the absorber, and the leak-proof wall is supported in an upright state due to increased rigidity in the joint part. For this reason, the diaper 1 is less likely to fall down in the lateral direction and the front-rear direction. Thereby, it becomes possible to make the diaper stand on a plane stably.

  In such a pants-type disposable diaper, it is preferable that the high-rigidity part has a discontinuous part in a certain region including a central position in the longitudinal direction of the absorbent body.

  According to such a pants-type disposable diaper, since the high-rigidity portion is discontinuous in the longitudinal center portion of the absorbent body that hits the position of the wearer's crotch when wearing the diaper, the absorbent body has an arc shape in the front-rear direction. When deforming into a (U-shaped) shape, the force propagating along the highly rigid portion (the force for bending the absorber) is interrupted at the discontinuous portion. Therefore, in the longitudinal central portion where the discontinuous portion is formed, the absorber is not easily bent and the planar shape is easily maintained. Thereby, it becomes easy to make a diaper self-supporting by installing the said planar shape part on planes, such as a floor.

  In such a pants-type disposable diaper, in the longitudinal direction, a distance between the back side end of the joint portion in the longitudinal direction and a central position in the longitudinal direction of the pants-type disposable diaper is in the longitudinal direction. It is desirable that the distance between the ventral end in the longitudinal direction of the joint and the central position in the longitudinal direction of the pants-type disposable diaper is shorter.

  According to such a pants-type disposable diaper, the portion where the rigidity of the leak-proof wall is increased by the joint is short on the back side, so that the support in the back side region of the leg opening of the diaper is more than the support in the ventral region. Also become weaker. In general, the area of the back waistline that covers the buttocks side of the wearer is larger than the area of the abdomen waistline, so the diaper is heavier on the back side, so that if you try to make the diaper stand on its own, it will roll back Easy to fall. On the other hand, by making the support in the dorsal region weaker than the support in the ventral region, the dorsal region of the absorber is more easily deformed than the ventral region of the absorber, When the dorsal region is deformed into a flat shape, it is easy to effectively prevent the diaper from falling to the dorsal side.

  In such a pants-type disposable diaper, the absorbent body has a constricted portion between both end portions of the absorbent body in the longitudinal direction, and the constricted portion is at least at a central position in the longitudinal direction of the absorbent body. It is desirable to have a narrow portion where the width in the lateral direction is the narrowest.

  According to such a pants-type disposable diaper, in the central region where the narrow portion is formed in the longitudinal direction of the absorbent body, the rigidity of the absorbent body is lower than other regions. When placed on a flat surface such as a floor (when grounded to a flat surface), the central region is easily deformed along the flat surface such as the floor. Thereby, the center area | region of an absorber tends to become a planar shape and can make a diaper self-supporting easily.

  In such a pants-type disposable diaper, it is desirable that in the longitudinal direction, the highly rigid portion and the narrow portion of the absorber overlap.

  According to such a pants-type disposable diaper, in the region sandwiched between the pair of high-rigidity portions in the lateral direction in the absorbent body, the base point of bending deformation is formed by being supported by the high-rigidity portions on both sides. It is difficult to cause wrinkles on the surface of the absorber or twisting of the absorber. Therefore, in the region where the narrow portion of the absorbent body deformed into a planar shape and the high-rigidity portion overlap, the absorbent body can easily maintain the planar shape stably, and the diaper can be made independent.

  In such a pants-type disposable diaper, it is preferable that in the longitudinal direction, the joint portion and the narrow portion of the absorber overlap.

  According to such a pants-type disposable diaper, when the diaper is made to stand on its own, the folded joint portion is disposed above the narrow portion in the vertical direction. Therefore, the standing state of the leak-proof wall is easily maintained by the folded joint portions on both lateral sides of the narrow portion. Thereby, it becomes easy for an absorber to maintain a planar shape between a pair of standing leak-proof walls, and the diaper placed on the plane can be made difficult to fall.

  In such a pants-type disposable diaper, on the back side in the longitudinal direction, a leg-hole elastic member that expands and contracts in the horizontal direction is disposed, and the leg-hole elastic member is arranged at the central portion in the horizontal direction. A straight portion arranged along the lateral direction so as to overlap with the absorber in the thickness direction, and curved from both lateral sides of the linear portion to the lateral side outside and the longitudinal back side. It is desirable that the leakage preventing wall and the leg-hole elastic member have a portion that intersects the thickness direction.

  According to such a pants-type disposable diaper, the contraction force of the leg elastic member acts, so that the back side waistline part having a larger area than the abdominal side waistline protrudes excessively on the back side in the front-rear direction. Is suppressed. Therefore, when the diaper is placed on a flat surface, the balance of the center of gravity is less likely to be biased between the back side waistline part and the abdomen side waistline part, and the diaper can be made stable and easy to stand on its own.

  In such a pants-type disposable diaper, it is desirable that the joint portion and the leg-hole elastic member have a portion that intersects the thickness direction.

  According to such a pants-type disposable diaper, the lateral contraction force by the back leg elastic member and the longitudinal contraction force by the elastic member provided at the joint part interact with each other, and the back waist part Is easily contracted inward in the lateral direction and is pulled inward in the longitudinal direction (abdominal side). Thereby, compared with the abdominal side waist part, it will be in the state where the circumference | surroundings are supported in the horizontal direction and the longitudinal direction of the back side waist part which is large in area and heavy. Therefore, when the diaper is placed on a flat surface, the diaper is prevented from falling to the rear side (back side), and the diaper can be made independent.

  In such a pants-type disposable diaper, the absorbent body has a constricted portion between both end portions of the absorbent body in the longitudinal direction, and the pair of joint portions are respectively connected to the absorbent body in the thickness direction. It is preferable that the distance between the pair of joint portions in the lateral direction is shorter than the length at both end portions in the longitudinal direction of the absorbent body.

  According to such a pants-type disposable diaper, when the joint portion is formed in the region within the constricted portion of the absorber, the leak-proof wall is folded by the joint portion in the region, and the standing height of the leak-proof wall is increased. You can avoid getting too expensive. Moreover, since a junction part does not overlap with an absorber, it becomes difficult to press a highly rigid junction part on a wearer's body (skin side) at the time of wear, and the deterioration of the touch at the time of diaper wear can be suppressed.

=== Embodiment ===
<Basic configuration of diaper 1>
As an example of the absorbent article handled in the present embodiment, a basic configuration of a pants-type disposable diaper 1 (hereinafter also referred to as “diaper 1”) will be described. FIG. 1 is a plan view of the diaper 1 in an unfolded and extended state. FIG. 2 is a schematic perspective view of the diaper 1 viewed from the ventral side. 3A is a schematic cross-sectional view taken along the line AA in FIG. 1, FIG. 3B is a schematic cross-sectional view taken along the line BB in FIG. 1A, and FIG. 3C is a schematic cross-sectional view taken along the line CC in FIG. . In addition, the "elongation state" in FIG. 1 is the state which extended the product (diaper 1) thoroughly, specifically, the dimension of each member (for example, back sheet 30 etc. mentioned later) which comprises the diaper 1 is the size. It means a state in which it has been extended to a length that matches or is close to the dimension of the member itself.

  The diaper 1 has a vertical direction, a horizontal direction, and a front-rear direction as three directions orthogonal to each other in the pant-type state of FIG. And in the following, the one side and the other side in the vertical direction in this pants-type state are also referred to as the “trunk opening side” and the “inseam side”, respectively, and the front side and the back side in the front-rear direction are respectively Also called “ventral” and “dorsal”.

  On the other hand, in the developed state of FIG. 1, the diaper 1 has a longitudinal direction and a width direction as three directions orthogonal to each other. In the following description, the one side and the other side in the longitudinal direction in the developed state are also referred to as “abdominal side” and “back side”, respectively. In addition, said width direction in the expansion | deployment state is the same direction as said horizontal direction in a pants type state. Therefore, in the following, the width direction is also referred to as “lateral direction”. Moreover, the longitudinal direction of the unfolded state is a direction along the longitudinal direction of the pants-type state. In addition, as shown in FIG. 3, the direction perpendicular to the longitudinal direction (longitudinal direction) and the lateral direction (width direction) is referred to as the “thickness direction”, and the side in contact with the skin of the wearer is referred to as the “skin side”. The opposite side is referred to as the “non-skin side”.

  Moreover, the diaper 1 has the abdominal side waistline part 3, the back side waistline part 4, and the crotch part 5 in a longitudinal direction, as shown in FIG. The ventral waist part 3 is a part located on the wearer's ventral side when the diaper 1 is worn. The back waistline portion 4 is a portion located on the wearer's back side when the diaper 1 is worn. A crotch part 5 is provided between the ventral waist part 3 and the back waist part 4.

  The diaper 1 of the present embodiment includes an absorbent main body 10, a top sheet 20, a back sheet 30, and a leak-proof wall 50. 1, the absorbent main body 10 is folded in two at a predetermined position CL10 in the longitudinal direction (longitudinal direction) of the absorbent main body 10, and the antinodes opposed to each other in the folded state. When the side waistline portion 3 and the back side waistline portion 4 are joined by welding or the like at the ventral side edge portion 3es and the back side edge portion 4es, the waistline portions 3 and 4 are connected in an annular shape, A pant-type diaper 1 in which a waist opening BH and a pair of leg openings LH and LH as shown in FIG. 2 are formed.

  FIG. 4 is a schematic plan view of the absorbent main body 10 in a deployed and elongated state. The absorptive main body 10 has a function of absorbing excrement such as urine, has a substantially rectangular shape in plan view as shown in FIGS. 1 and 4, and has a longitudinal direction along the longitudinal direction of the diaper 1. Located in the center of the direction. The absorbent main body 10 includes a liquid absorbent absorbent body (absorbent core) 11 and a core wrap sheet 12 that covers the outer peripheral surface of the absorbent body 11. Further, as shown in FIG. 4, when the absorbent main body 10 is unfolded and stretched and viewed from the thickness direction (skin side), a pair of leak-proof walls 50 are provided on both sides of the absorbent main body 10 in the lateral direction. Is provided. Details of the leak-proof wall 50 will be described later.

  The absorbent body 11 is formed by molding liquid absorbent fibers such as pulp fibers into a predetermined shape, and a superabsorbent polymer (so-called SAP) or the like is mixed therein. In the present embodiment, the absorber 11 has a substantially hourglass shape in plan view, and has a constricted portion 11c whose central portion in the longitudinal direction is recessed inward in the lateral direction. That is, the absorbent body 11 includes a constricted portion 11c having a lateral dimension smaller than the ventral end portion 11ea and the back end portion 11eb in the longitudinal direction of the absorbent body 11, and a region between both longitudinal end portions 11ea and 11eb. Have. And the narrow part 11c has the narrow part 11s with a small dimension of a horizontal direction in the center area | region of a longitudinal direction. In the present embodiment, as shown in FIG. 4, in a predetermined region including the central position CL10 in the longitudinal direction, the lateral width of the absorber 11 is the narrowest, and the narrow portion 11s is formed in the region shape. ing. The core wrap sheet 12 is a liquid-permeable sheet member that covers the outer peripheral surface of the absorbent body 11, and tissue paper, nonwoven fabric, or the like can be used.

  A pair of high-rigidity portions 110 are formed in a region where the constricted portion 11 c is provided in the longitudinal direction of the absorbent body 11. The high-rigidity part 110 is a pressing part formed by pressing the surface of the absorbent body 11 from the skin side or the non-skin side, and the other part (that is, the high-rigidity part 110 is formed). It is more rigid and thinner than the non-part). In the present embodiment, as shown in FIG. 4, a pair of high-rigidity portions 110 having a predetermined interval in the lateral direction are formed with a predetermined length along the longitudinal direction. The high-rigidity portion 110 has a discontinuous portion 110g at the center in the longitudinal direction. In the non-continuous part 110g, the surface of the absorber 10 is not compressed and the rigidity is not high. In the example of FIG. 4, the range of the length L110g centering on the center position CL10 in the longitudinal direction is the discontinuous portion 110g. In addition, the high-rigidity portion 110 has a length of L110 in the longitudinal direction across the discontinuous portion 110g.

  The top sheet 20 is a liquid-permeable sheet member (inner layer sheet) that is disposed on the skin side surface in the thickness direction of the absorbent main body 10 and contacts the wearer's skin when the diaper 1 is worn. The top sheet 20 of the present embodiment is formed of, for example, an air-through nonwoven fabric or a spunbond nonwoven fabric.

  The back sheet 30 is a sheet member (outer layer sheet) that is disposed on the non-skin side in the thickness direction of the absorbent main body 10 and constitutes the outer layer of the diaper 1. In the present embodiment, the back sheet 30 includes a back film 31, an upper outer layer sheet 32, and a lower outer layer sheet 33. The back film 31 is a liquid-impermeable and moisture-permeable sheet member disposed on the non-skin side of the absorbent main body 10, and is formed of, for example, a resin film. Providing the back film 31 suppresses movement (penetration) of moisture such as urine absorbed by the absorbent main body 10 toward the wearer's clothes.

  The upper outer layer sheet 32 and the lower outer layer sheet 33 are flexible sheet-like members that are arranged on the non-skin side of the back film 31 while being stacked in the thickness direction, and are formed of, for example, a spunbond nonwoven fabric. The upper outer layer sheet 32 and the lower outer layer sheet 33 have the same shape at least in the ventral waist part 3 and the back waist part 4, and as a whole have a substantially hourglass shape as shown in FIG. That is, the back seat 30 has a constricted portion 30c in which a central portion (crotch portion 5) in the longitudinal direction is recessed inward in the lateral direction between the ventral waist portion 3 and the back waist portion 4.

  In addition, an elastic member such as rubber thread is provided between the upper outer layer sheet 32 and the lower outer layer sheet 33 in the thickness direction. In the present embodiment, as shown in FIG. 1, a plurality of ventral waist elastic members 35 a have a predetermined expansion ratio in the belly waist region 3 of the diaper 1 (region between the stomach side edge portions 3 es and 3 es). Thus, the upper outer layer sheet 32 and the lower outer layer sheet 33 are sandwiched and joined in a state of being stretched in the horizontal direction. By this abdominal waistline elastic member 35a, lateral stretchability is imparted to the abdomen waistline part 3 of the diaper 1. Similarly, in the back side waistline part 4 (area between the back side edge parts 4es, 4es) of the diaper 1, the plurality of back side waistline elastic members 35b are extended in the lateral direction at a predetermined extension magnification. It is joined between the outer layer sheet 32 and the lower outer layer sheet 33. By this back side waistline elastic member 35b, the stretchability in the horizontal direction is imparted to the back side waistline portion 4 of the diaper 1.

  The “extension ratio” of the elastic member is defined as follows. Elongation magnification = (length of elastic member in extension state) ÷ (length of elastic member in natural state). In this specification, the expansion ratio is measured as follows, for example. Cut out the gathering area of the back waistline member. After cutting, the elongation rate of the gathered sample is measured, and the elongation rate of the elastic member is measured. Each cut sample is left for 60 minutes in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH, and the length of the sample is measured along the stretching direction. This length is defined as “the length of the elastic member in the natural state”. The length in the expansion / contraction direction of the desired region in the natural state and the length in the expansion / contraction direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed on the side sheet are measured. This length is defined as “length of the elastic member in the extended state”. Using these measurement results, the expansion ratio is measured by calculating with the above formula.

  Further, the back waistline portion 4 is provided with a plurality of back side leg elastic members 35lg. The back leg-hole elastic member 35lg is arranged to be curved along the constricted portion 30c from the inner region in the longitudinal direction of the back-side waist portion 4 (position closer to the center of the absorber 11 in the longitudinal direction). Specifically, as shown in FIG. 1, the back leg elastic member 35 lg is a straight portion disposed along the lateral direction in the lateral central portion (region where the absorber 11 is disposed). 35 lgs, and a curved portion 35 lgc arranged so as to bend obliquely upward toward the outside in the lateral direction from both lateral sides of the straight portion 35 lgs. The straight portion 35lgs and the curved portion 35lgc are joined between the upper outer layer sheet 32 and the lower outer layer sheet 33 in a state of being stretched at different stretching magnifications.

  In the present embodiment, the back leg-hole elastic member 35lg is arranged so that the extension magnification in the linear portion 35lgs is lower than the extension magnification of the back waistline elastic member 35b. Since the straight portion 35lgs has a portion overlapping the absorbent body 11 (absorbent body 10) in the central portion in the lateral direction, the absorbent body 11 is excessively contracted in the lateral direction by reducing the expansion ratio. Can be suppressed. The expansion magnification may be different depending on the horizontal position of the linear portion 35lgs. For example, the expansion ratio at the central portion in the horizontal direction of the straight portion 35lgs may be lower than the expansion magnification at both ends in the horizontal direction. Thereby, a gradient is generated in the stress in the straight part 35 lgs, and the shrinkage of the absorbent body 11 can be suppressed without impairing the fit.

  On the other hand, the expansion ratio of the curved portion 35lgc is arranged to be higher than the expansion ratio of the back waistline elastic member 35b. The curved portion 35lgc is disposed along the constricted portion 30c on the back side of the diaper 1, but this region abuts against the wearer's buttocks when the diaper 1 is worn, and is displaced by the wearer moving his / her leg. It is a part that tends to occur. Therefore, by increasing the expansion magnification of the curved portion 35lgc, the contraction force is increased to make it difficult to cause a positional shift. Moreover, since the shrinkage | contraction amount of the back seat | sheet 30 becomes large in the vicinity of the leg periphery opening LH, the back seat | sheet 30 becomes easy to deform | transform into the shape along the roundness of a wearer's buttocks, and can improve fitting property. Similar to the straight line portion 35lgs, the expansion magnification may be different in the lateral direction of the curved portion 35lgc. For example, in the bending portion 35lgc, the expansion ratio may be higher on the outer side than on the inner side in the horizontal direction.

<Leakage barrier 50>
Next, the leakage barrier 50 will be described. The leak-proof walls 50 are disposed along the longitudinal direction of the absorbent main body 10 (the vertical direction of the diaper 1) on both lateral sides of the absorbent main body 10, and from the side end of the absorbent main body 10 when the diaper 1 is worn. It stands up and it suppresses that excrement leaks outside the diaper 1 (lateral leakage). FIG. 5 is a plan view of the leak-proof wall 50 in the expanded and extended state. FIG. 6 is a schematic cross-sectional view illustrating the region D in FIG. 3C in an enlarged manner. In FIG. 6, for the sake of convenience, the scale in the thickness direction is modified and shown.

  The leak-proof wall 50 is formed by folding a rectangular sheet member 50s as shown in FIG. 5 in the lateral direction along folding lines f1 to f3 along the longitudinal direction (vertical direction). As the sheet member 50 s forming the leak-proof wall 50, for example, a flexible sheet member such as a nonwoven fabric can be used. In addition, the leak-proof wall 50 is provided with a plurality of leak-proof wall elastic members 55 such as thread rubber that can expand and contract in the longitudinal direction. In the example of FIG. 5, six leak-proof wall elastic members 551 to 556 along the longitudinal direction are arranged side by side from the lateral outer side to the inner side. The leak-proof wall elastic members 551 to 556 are joined to the leak-proof wall 50 in a state of being stretched at a predetermined stretch ratio in the longitudinal direction. The leak-proof wall elastic member 55 imparts stretchability along the longitudinal direction to the leak-proof wall 50, and erects the leak-proof wall 50 when the diaper 1 is worn.

  The leak-proof wall elastic member 55 exhibits stretchability in a range indicated by a broken line in FIGS. 1 and 5. In addition, the leak-proof wall elastic member 55 which does not express a stretch property may exist in the area | region outside a longitudinal direction (vertical direction) rather than the range shown with the broken line in FIG.1 and FIG.5. Further, the number and arrangement of the leak-proof wall elastic members 55 are not limited to those shown in FIG. 5 and can be appropriately changed according to the use of the diaper 1.

  In the unfolded state shown in FIG. 5, the lateral inner end portion 50 ei of the leak-proof wall 50 (sheet member 50 s) is between the absorbent main body 10 and the leak-proof film 31 (back sheet 30) in the thickness direction. Bonded and fixed. On the other hand, the lateral outer end 50eо of the leak-proof wall 50 (sheet member 50s) projects outward in the lateral direction of the absorbent main body 10. In this state, the outer end 50eо is bent inward in the lateral direction with the fold line f1 as a base point, and the sheet members 50s are overlapped in the thickness direction with the leak-proof wall elastic members 551 to 556 sandwiched therebetween, Are joined together. Of the leak-proof wall elastic members 55 that are provided side by side in the horizontal direction, the outermost elastic member (the leak-proof wall elastic member 551 in FIG. 5) is arranged in alignment with the horizontal position of the fold line f1. Has been.

  Subsequently, the sheet member 50s is bent in the thickness direction on the non-skin side and in the lateral direction with the folding line f2 as a base point. The lateral position of the fold line f2 is substantially the same as the lateral position of the leak-proof wall elastic member 555. Subsequently, the sheet member 50s is bent toward the skin side in the thickness direction and the inner side in the lateral direction with the folding line f3 as a base point. Thereby, the leak-proof wall 50 bent in a substantially S shape as shown in FIGS. 3 and 6 is formed. In the case of FIG. 6, the position of the fold line f <b> 3 becomes the base 50 rp when the leak-proof wall 50 is erected.

  The leak-proof wall 50 has the top surface portion 51 formed on the most skin side in the thickness direction by folding the sheet member 50s from one side in the lateral direction to the other side. The top surface portion 51 is a region having a predetermined width in the lateral direction between the fold line f1 and the fold line f2, and the top surface portion 51 is provided with leak-proof wall elastic members 551 to 555. Further, a lower surface portion 52 is formed on the non-skin side of the top surface portion 51 in the thickness direction. The lower surface portion 52 is a region having a predetermined width in the lateral direction between the fold line f2 and the fold line f3. The lower surface portion 52 is provided with leak-proof wall elastic members 555 to 556. Note that the leak-proof wall elastic member 555 is provided at both the top surface portion 51 and the bottom surface portion 52 because it is disposed at substantially the same position as the fold line f2 in the lateral direction as described above.

  In the leak-proof wall 50, partial areas of the top surface portion 51 and the bottom surface portion 52 are joined in the thickness direction via the folding joint portion 61. That is, the surfaces on one side in the thickness direction of the leak-proof wall 50 (sheet member 50s) are joined by the folding joint 61. Hereinafter, a region on the inner side in the lateral direction from the portion where the folded joint portion 61 is formed in the leak-proof wall 50 is also referred to as a folded portion 53. In the present embodiment, a fold joint portion 61 indicated by a hatched portion in FIG. 6 is provided in a region on the inner side in the horizontal direction of the top surface portion 51 (lower surface portion 52), and a fold portion 53 is formed. The folding joint 61 is formed by using an adhesive means using an adhesive such as a hot melt adhesive, or a crimping means such as embossing. Note that the folding joint portion 61 does not need to be formed over the entire lateral direction of the folding portion 53 as shown in FIG. 6. For example, the folding joint portion 61 is folded at the lateral inner end (the position of the folding line f 2 in FIG. 6). The joining part 61 may not be formed. In other words, the folding joint 61 may be formed at a predetermined distance from the lateral inner end of the top surface portion of the leak-proof wall 50.

  As shown in FIG. 4, the folding joint 61 has a length L61a from the central position CL10 in the longitudinal direction to the ventral end in the longitudinal direction, and from the central position CL10 in the longitudinal direction to the dorsal end in the longitudinal direction. Is L61b. That is, the folding joint 61 is formed so that the abdomen side is longer than the longitudinal center position CL10 and the back side is shorter (L61a> L61b).

  On the other hand, in the laterally outer region where the folding joint 61 is not provided, the top surface 51 and the bottom surface 52 are not joined, and both can be detached in the thickness direction. Hereinafter, the outer side of the top surface portion 51 in the lateral direction from the portion where the folded joint portion 61 is provided is also referred to as a single layer portion 54. The term “single layer” as used herein means a layer composed only of the top surface portion 51, and the top surface portion 51 itself may have a multilayer structure as shown in FIG.

  In the region outside the longitudinal direction of the folding joint 61, the folding joint 61 is not provided. That is, in the leakage preventing wall 50, the one side surface in the thickness direction of the leakage preventing wall 50 (sheet member 50 s) is in the region on the one side and the region on the other side of the folding joint 61 in the longitudinal direction. It has the non-joining part 62 which is not joined. As shown in FIG. 3B, the non-joint portion 62 is not joined to the top surface portion 51 and the bottom surface portion 52 of the leak-proof wall 50, so the folding portion 53 is not formed, and the lateral direction of the top surface portion 51 is not formed. The entire region is a single layer part. In FIG. 1, the non-joining portions 62 are provided on both outer sides in the longitudinal direction of the folding joint portion 61, but the non-joining portions 62 may be provided only on one side in the longitudinal direction.

  Further, end joints 63 are provided at both ends in the longitudinal direction of the leak-proof wall 50. In the end joint portion 63, as shown by the hatched portion in FIG. 3A, the top surface portion 51 and the bottom surface portion 52 of the leak-proof wall 50 are joined, and the bottom surface portion 52 and the top sheet 20 are joined. Thereby, the top surface part 51 and the lower surface part 52 are fixed to the skin side surface of the top sheet 20 at the end in the longitudinal direction of the leak-proof wall 50. In addition, as FIG. 1 shows, the end junction part 63 is arrange | positioned in the horizontal direction outer side rather than the folding joint part 61, and, thereby, the horizontal direction outer side edge part of the top | upper surface part 51 may rise. It is suppressed.

<Function of leak-proof wall 50 when diaper 1 is worn>
In the diaper 1 of the present embodiment, the leak-proof wall 50 has the above-described substantially S-shaped bent structure (see FIG. 6), so that even if excretion is performed, it is difficult for the wearer to feel uncomfortable. However, it can suppress that a clearance gap arises in a crotch part. Drawing 7 is a figure explaining the wearing state of diaper 1 before excretion is performed. FIG. 8 is a diagram illustrating a wearing state of the diaper 1 after excretion is performed.

  In the wearing state of the diaper 1 shown in FIG. 7, the top surface portion 51 arranged on the skin side of the leak-proof wall 50 comes into contact with the wearer's body. That is, it arrange | positions so that the whole top | upper surface part 51 may surface-contact with a wearer's body. The folding part 53 of the top surface part 51 has high rigidity by being joined by the folding joint part 61 in a state where the top surface part 51 and the bottom surface part 52 are laminated. Therefore, when the contraction force by the leak-proof wall elastic members 555 and 556 acts on the folded portion 53, the folded portion 53 is firmly pressed against the wearer's body while maintaining the surface shape. At this time, the distance between the pair of leak-proof walls 50 in the horizontal direction (the distance between the folded portions 53 and 53 in the horizontal direction) is defined as W50. On the other hand, in the top surface portion 51, the single-layer portion 54 laterally outer than the folding joint portion 61 is provided with more leak-proof wall elastic members 551 to 554 than the folding joint portion 61 than the lateral inner side. Yes. Since the single layer portion 54 has lower rigidity than the folding portion 53, it is easily deformed freely. Therefore, when the contraction force by the leak-proof wall elastic members 551 to 554 arranged on the single layer part 54 acts, the single layer part 54 presses against the skin side of the wearer while forming a curved surface according to the unevenness of the body. It is done. In addition, the plurality of leak-proof wall elastic members 551 to 554 can effectively prevent the single layer portion 54 from being rolled up.

  Thereby, the whole top | upper surface part 51 of the leak-proof wall 50 can be made to fit a wearer's body by a surface. In addition, since the top surface portion 51 is in surface contact with the wearer's body, the surface pressure acting on the wearer's skin as the entire top surface portion 51 is dispersed by the contraction force by the plurality of leak-proof wall elastic members 551 to 556 being dispersed. It is getting bigger. Therefore, compared with the case where the contraction force by a plurality of leak-proof wall elastic members 551 to 556 (for example, rubber thread) individually acts on the wearer's skin, the local increase in pressure is suppressed. Thus, it is possible to prevent the wearing comfort of the diaper 1 from deteriorating and to hardly damage the wearer's skin.

  In the present embodiment, at least one leak-proof wall elastic member 556 is provided on the lower surface portion 52 of the folding portion 53 (see FIG. 6). As the leak-proof wall elastic member 556 contracts, the lower surface portion 52 and the top surface portion 51 are simultaneously pushed up toward the wearer's skin, so that the folding portion 53 maintains contact with the wearer's skin while maintaining the surface shape. (Surface contact) is easier.

  When excretion is performed in the diaper 1 in the state of FIG. 7, the absorbent body 11 absorbs urine and the like and becomes heavier and tends to move downward. However, in the diaper 1 of this embodiment, the force which pushes the top surface part 51 upward (the wearer's skin side) is generated by the contraction force of the plurality of elastic members provided in the folding part 53 and the single layer part 54. The increase in the weight of the absorber 11 serves as a resistance against the force by which the leak-proof wall 50 is pulled downward. Further, since the top surface portion 51 is in surface contact with the wearer's skin, the friction on the contact surface is large, and the positional displacement of the top surface portion 51 hardly occurs. Therefore, the horizontal interval W50 between the pair of leak-proof walls 50 is unlikely to fluctuate before and after excretion. From these things, it is easy to maintain the state which the top | upper surface part 51 of the leak-proof wall 50 contact | abutted the wearer's skin like FIG. 8, and it becomes difficult to produce problems, such as a clearance gap producing in the leg periphery part of the diaper 1. .

  In addition, the sag of the absorbent body 11 is more likely to occur as the standing part of the leak-proof wall 50 is higher. That is, as shown in FIG. 8, the longer the distance L <b> 2 from the lateral outer end of the absorbent body 11 to the portion where the leak-proof wall 50 comes into contact with the wearer's skin, the easier the absorbent body 11 hangs down. Become. In this regard, in the leak-proof wall 50 of the diaper 1, the leak-proof wall 50 is bent inward in the horizontal direction from the lateral outer end of the folded joint 61, and the position of the leak-proof wall elastic member 555 (bending line f2). Is folded back outward in the lateral direction to form a folded portion 53. By folding a part of leak-proof wall 50 by this folding part 53, it is suppressed that distance L2 of the standing part of leak-proof wall 50 becomes too long, and it is suppressed that absorber 11 droops greatly below. This can make it difficult for the wearer to feel uncomfortable.

  In addition, the folding joining part 61 (folding part 53) is formed in the area | region of the constriction part 11c of the absorber 11 in a longitudinal direction, as FIG.1 and FIG.4 shows. In other words, the pair of folded joint portions 61 formed on both sides in the lateral direction do not overlap with the absorber 11 in the thickness direction, and the interval between the pair of folded joint portions 61 in the lateral direction is It is narrower than the length (width) of both ends in the vertical direction of the absorbent body 11 in the horizontal direction. In the region of the absorber 11 where the constricted portion 11c is formed, the distance from the lateral end of the absorber 11 to the upright base 50rp of the leak-proof wall 50 becomes longer (see FIG. 6). The sag is likely to occur. Therefore, by providing the leak-proof wall 50 with the fold joint portion 61 in this region and folding the leak-proof wall 50 with the fold portion 53, the distance L2 can be made as short as possible to effectively suppress the sag of the absorber 11. I am doing so. Furthermore, the portion where the rigidity is increased by the folding joint portion 61 of the leak-proof wall 50 is worn by the absorbent body 11 by forming the folding joint portion 61 so as not to overlap the absorbent body 11 in the thickness direction. It is suppressed from being pressed against the person's body (skin side). Thereby, the deterioration of the touch at the time of diaper 1 wear can be suppressed.

<Independence of diaper 1>
When the wearer wears the diaper 1 having the leak-proof wall 50, the leg is passed from the upper side of the waist opening BH to the leg opening LH while the wearer is standing, and the diaper 1 is pulled up to the wearer's inseam. It is desirable to put it on. In this way, the leak-proof wall 50 is not easily crushed or swung during the wearing operation of the diaper 1, and the top surface portion 51 of the leak-proof wall 50 is fitted to the wearer's skin as described in FIG. It becomes easy. The diaper 1 of the present embodiment has a structure capable of being self-supported when placed on a flat surface such as a floor, and the wearer passes the leg from above on the diaper 1 being self-supported on the floor or the like. Easy to wear. Hereinafter, the independence of the diaper 1 will be described.

  In general, a pants-type disposable diaper is formed of a flexible member such as a non-woven fabric. Therefore, when the pants-type disposable diaper is placed on a floor or the like, it is difficult to fall down and be crushed. On the other hand, the diaper 1 of the present embodiment is placed on the floor or the like by the action of the high rigidity portion 110 provided in the absorber 11 and the folding joint portion 61 provided in the leak-proof wall 50. , The waistline opening BH can be made to stand upward.

  FIG. 9 is a perspective view illustrating a state in which the diaper 1 is self-supporting. FIG. 10 is a side view of a state in which the diaper 1 is self-supporting as viewed from the side. In the diaper 1 formed in a pants shape, the absorbent body 11 is bent into a substantially arc shape in the lateral direction and the front-rear direction from the planar state shown in FIG. 1 and transformed into a cup shape that covers the crotch of the wearer. Yes. 9 and 10, when the diaper 1 is placed on a flat surface such as a floor with the crotch part 5 facing down, a part of the absorber 11 is flat in a region where the crotch part 5 contacts the flat surface. It functions as a foundation that supports the diaper 1.

  FIG. 11 is a schematic cross-sectional view illustrating the state of the absorber 11 and the leakage barrier 50 when viewed from the front-rear direction with the diaper 1 being self-supporting. In FIG. 11, the lateral end portions 11es of the absorbent body 11 are curved upward, whereas the lateral direction of the absorbent body 11 is a portion sandwiched between the pair of high-rigidity portions 110. The central portion 11cs maintains a planar shape. This is because when the absorber 11 is deformed into a substantially arc shape, the position of the high-rigidity portion 110 becomes a base point of bending in the lateral direction, and the end portions 11es on both outer sides in the lateral direction than the high-rigidity portion 110 are formed. It becomes easy to bend upward. On the other hand, since the bending base point is difficult to be formed in the central portion 11cs sandwiched between the high-rigidity portions 110 in the lateral direction, the absorber is unlikely to be bent or curved in the central portion 11cs. It is easy to form a plane along the planar shape. Then, due to the rigidity of the absorber 11 itself, the plane formed in the central portion 11cs is easily maintained as it is.

  Moreover, in FIG. 11, a pair of leak-proof wall 50 provided in the horizontal direction outer side of the absorber 11 stands up from the horizontal direction both ends 11es of the absorber 11 (absorbent main body 10), respectively. And since the folding joint part 61 is formed along the longitudinal direction of this leak-proof wall 50, the rigidity of the folding part 53 of the leak-proof wall 50 becomes high, and it is supported by the folding part 53 with high rigidity. Thus, the leak-proof wall 50 is easy to maintain the standing state.

  As described above, the laterally central portion 11cs of the absorber 11 can easily maintain the planar shape, and the both end portions 11es and the leakage preventing wall 50 of the absorber 11 can easily maintain the curved shape as shown in FIG. Thereby, since it becomes easy to maintain the diaper 1 in the cup-shaped shape which used the horizontal direction center part 11cs as the bottom face, it is suppressed that it falls down or is crushed in the horizontal direction. Therefore, it becomes possible to make the diaper 1 stand on a plane stably.

  FIG. 12 is a schematic cross-sectional view illustrating the state of the absorber 11 and the leak-proof wall 50 when viewed from the lateral direction (left-right direction) with the diaper 1 being self-supporting. In FIG. 12, the ventral end portion 11ea and the back end portion 11eb of the absorber 11 are curved upward, whereas the high-rigidity portion 110 is discontinuous at the central portion in the longitudinal direction. In the region corresponding to the continuous portion 110g, the absorber 11 maintains a planar shape. In the pants-type diaper 1, the absorber 11 is bent when the absorber 11 is bent and deformed in a substantially arc shape (U-shape) between the ventral waist portion 3 and the back waistline portion 4. The force propagates in the longitudinal direction through the high rigidity portion 110. However, this force is interrupted at the longitudinal boundary between the high-rigidity portion 110 and the discontinuous portion 110g, and the force that bends the absorber 11 in the front-rear direction is less likely to act on the discontinuous portion 110g. Accordingly, the discontinuous portion 110g in the longitudinal direction of the absorbent body 11 forms a flat surface corresponding to the floor or the like, and the discontinuous portion 110g is maintained without being bent in the front-back direction.

  Further, when viewed from the lateral direction, the folded joint portion 61 of the leak-proof wall 50 erected along the leg opening LH from both lateral sides of the absorbent body 11 (absorbent body 10) is the belly of the absorbent body 11. It arrange | positions so that it may span between the side edge part 11ea and the back side edge part 11eb. Therefore, the highly rigid folding joint 61 acts like a bow chord between the ventral end 11ea and the back end 11eb of the absorber 11 deformed into a substantially arc shape (U-shaped). The substantially arcuate deformation of the absorber 11 is supported. Thereby, the diaper 1 is easily maintained in a cup shape with the discontinuous portion 110g at the center in the longitudinal direction as the bottom surface, and the diaper 1 is prevented from falling or collapsing in the front-rear direction. Therefore, it becomes easy to make the diaper 1 stand on a plane stably.

  By the way, in the diaper 1 of this embodiment, in order to cover a wearer's buttocks widely, the area of the back sheet 30 (the back waistline portion 4) in the region on the back side from the longitudinal center position CL10 of the diaper 1 is the longitudinal direction. It is larger than the area of the back sheet 30 (ventral side waistline portion 3) in the region on the ventral side of the center position CL10. Therefore, in the diaper 1, the back side waistline part 4 becomes heavier than the abdominal side waistline part 3, and if it tries to stand on a plane, it will fall down easily so that it may roll to the back side with a heavy weight.

  On the other hand, in this embodiment, when making the diaper 1 self-supporting, the diaper 1 falls to the back side by making the back side support by the leak-proof wall 50 (folded joint part 61) weaker than the abdomen side. To make it difficult. As a specific method for weakening the support on the back side, as described with reference to FIG. 4, the length L61a from the central position CL10 in the longitudinal direction of the folding joint portion 61 of the leak-proof wall 50 to the ventral end portion is as follows. The length is longer than the length L61b from the longitudinal center position CL10 to the back end. That is, since the folding joint 61 having a high rigidity in the leak-proof wall 50 is shorter on the back side than the abdomen side, the force supporting the absorber 11 in the back side region is weakened. Thereby, the absorber 11 is more easily deformed in the back region, and when the diaper 1 is placed on a flat surface such as a floor, the back region of the absorber 11 easily forms a planar shape. Therefore, it can suppress effectively that the diaper 1 falls to the back side.

  Moreover, when making the diaper 1 self-support on a plane such as a floor as shown in FIGS. 9 and 10, the central position CL10 in the longitudinal direction of the crotch portion 5 is in contact (grounded) with the plane. And the absorber 11 has the narrow part 11s where the width | variety of the horizontal direction became the narrowest in the part of this CL10 (refer FIG. 4). Since the thickness of the absorber 11 is basically uniform except for the portion where the high-rigidity portion 110 is formed, a portion having a wider width in the lateral direction than the narrow portion 11s (for example, both longitudinal end portions 11ea, 11eb or the like), the rigidity of the absorber 11 is weaker in the narrow portion 11s. Therefore, when the crotch part 5 including the center position CL10 comes into contact with a flat surface such as a floor, the narrow portion 11s of the absorber 11 is easily deformed along the flat surface such as the floor, and a planar shape is easily formed. Thereby, since the center area | region of the longitudinal direction of the absorber 11 becomes a planar shape naturally, it can make it easier for the diaper 1 to become independent on a plane.

  In the present embodiment, the narrow portion 11s of the absorber 11 and the discontinuous portion 110g of the high-rigidity portion 110 are long in a state where the absorber 11 is extended in the longitudinal direction and the lateral direction as shown in FIG. Arranged at overlapping positions in the direction. Therefore, due to the synergistic effect of the discontinuous part 110g and the narrow part 11s, the absorbent body 11 is easily deformed into a planar shape and the planar shape is easily maintained in the overlapping part. Thereby, when the diaper 1 is placed on a flat surface, the diaper 1 can be easily and stably supported by the flat surface formed in the overlapping portion.

  However, the narrow portion 11s and the discontinuous portion 110g of the high-rigidity portion 110 do not completely coincide with each other in the longitudinal direction, and the width of the absorbent body 11 is extended in the longitudinal direction as shown in FIG. The narrow portion 11s and the high-rigidity portion 110 have overlapping portions in the longitudinal direction. As described above, the absorbent body 11 is unlikely to be bent or deformed in a region sandwiched between the pair of high-rigidity portions 110 in the lateral direction, and the surface of the absorbent body 11 is wrinkled or twisted. Problems such as this are unlikely to occur. Therefore, the planar shape formed in the discontinuous portion 110g can be easily maintained stably by preventing the wrinkles and twists from being generated in the absorber 11 at both longitudinal ends of the discontinuous portion 110g. it can. Thereby, the diaper 1 can be stably made independent.

  Moreover, in the state which extended the absorber 11 to the longitudinal direction like FIG. 4, the narrow part 11s and the folding joint part 61 have a part which overlaps in a longitudinal direction. With such a configuration, when the diaper 1 is made to stand on its own, the folded joint portion 61 is disposed above the narrow portion 11s in the vertical direction. As described above, since the leak-proof wall 50 is supported in an upright state on both lateral sides of the absorbent body 11 by providing the folded joint portion 61, the folded portion is folded upward in the vertical direction of the narrow portion 11s. If the joint portion 61 is disposed, the standing state of the leak-proof wall 50 is easily maintained on both lateral sides of the narrow portion 11s. Therefore, as described with reference to FIGS. 11 and 12, the absorber 10 can easily maintain a planar shape between the pair of standing leakage preventing walls 50. Thereby, it is possible to make the diaper 1 placed on a plane difficult to fall.

  Further, the back side waistline portion 4 of the diaper 1 is provided with a back side leg elastic member 35 lg so as to cross the back side waistline portion 4. Expresses sex. Accordingly, in the region where the back side leg-hole elastic member 35lg is provided, the back-side waistline portion 4 contracts in the lateral direction. In the diaper 1, it has been described that the area of the back waistline portion 4 is larger than the area of the ventral waistline portion 3. However, if the back leg elastic member 35 lg is not provided, the back waistline portion is provided. 4 protrudes to the back side in the front-rear direction or spreads excessively in the lateral direction, and when the diaper 1 is placed on a flat surface, it tends to fall down to the rear side (back side), and it may be difficult to stand on its own. is there. On the other hand, in the diaper 1 of the present embodiment, when the diaper 1 is placed on a plane, the back waistline portion 4 is placed on the back side in the front-rear direction by the back leg-hole elastic member 35lg as shown in FIG. Excessive bulging is suppressed. Therefore, when the diaper 1 is placed on a flat surface, the balance of the center of gravity is less likely to be biased between the back waistline portion 4 and the abdomen waistline portion 3, and the diaper 1 can be easily and stably supported.

  The back leg-hole elastic member 35lg has a portion that intersects the folded joint 61 in the thickness direction. Specifically, as shown in FIG. 1, the back side end portion of the folding joint portion 61 in the longitudinal direction intersects with the back side leg elastic member 35 lg. Therefore, the contraction force in the lateral direction by the back leg elastic member 35lg and the contraction force in the longitudinal direction by the leak-proof wall elastic member 55 provided in the folded joint 61 interact with each other, and the back waistline portion 4 It becomes easy to shrink inward in the lateral direction and is pulled inward in the longitudinal direction (abdominal side). Thereby, since the back side waistline part 4 with a large area and a heavy weight will be in the state supported about a horizontal direction and a longitudinal direction, when this diaper 1 is set | placed on a plane, this diaper 1 will be a back side (back side). ) Is suppressed, and the diaper 1 can be made independent.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

(About elastic members)
In the above-described embodiment, the example in which the thread rubber is used as the waistline elastic member and the leak-proof wall elastic member has been described. However, these elastic members are not limited to a linear elastic member such as a so-called thread rubber. For example, a planar (strip-shaped) elastic member having a predetermined width may be used. Further, the sheet member constituting the leak-proof wall or the back sheet may be a stretchable sheet member (for example, a stretchable nonwoven fabric), so that an elastic member such as rubber thread need not be provided separately.

1 diapers (pants-type disposable diapers),
3 ventral waistline, 3es ventral side edge,
4 Back side waistline part, 4es back side edge part,
5 Inseam,
10 Absorbent body, 10es outer edge,
11 Absorber, 11c Narrow part, 11s Narrow part, 11ea end part, 11eb end part,
11es end (horizontal direction), 11cs center (horizontal direction),
12 core wrap sheet,
20 Top sheet (inner layer sheet),
30 Back sheet (outer layer sheet), 30c Constricted part,
31 Back film, 32 Upper outer layer sheet, 33 Lower outer layer sheet,
35a ventral waist elastic member, 35b dorsal waist elastic member,
35 lg back leg elastic member, 35 lgs linear part, 35 lgc curved part,
50 leakage barrier,
50s sheet member, 50ei inner edge, 50eо outer edge, 50rp base,
51 top surface portion, 52 bottom surface portion, 53 folded portion, 54 single layer portion,
55 leak-proof wall elastic member, 551-555 leak-proof wall elastic member, 556 leak-proof wall elastic member,
61 Folding joint, 62 Non-joining part, 63 End joining part,
110 High rigidity part, 110g non-continuous part,
f1, f2, f3 fold line,
BH waist opening, LH leg opening,
CL10 center position,
W50 interval (folded joint),

Claims (9)

A longitudinal direction and a transverse direction intersecting the longitudinal direction,
A liquid absorbent absorber;
An abdomen waistline portion disposed on one end side in the longitudinal direction of the absorbent body and positioned on the abdomen side of the wearer when worn;
A back waistline portion disposed on the other end side in the longitudinal direction of the absorbent body and positioned on the back side of the wearer when worn;
A pants-type disposable diaper with
The absorbent body is provided with a pair of high-rigidity portions having a predetermined interval in the lateral direction and having higher rigidity than other regions along the longitudinal direction,
On the outside of the absorber in the lateral direction, it has a pair of leak-proof walls along the longitudinal direction,
The leak-proof wall has a joint part in which surfaces on one side in the thickness direction are joined together.
A pants-type disposable diaper characterized by that. The pants-type disposable diaper according to claim 1,
The pants-type disposable diaper, wherein the high-rigidity part has a discontinuous part in a certain region including a central position in the longitudinal direction of the absorbent body. The pants-type disposable diaper according to claim 1 or 2,
In the longitudinal direction, the distance between the back side end in the longitudinal direction of the joint and the central position in the longitudinal direction of the pants-type disposable diaper is:
The underpants type disposable diaper characterized by being shorter than the distance between the longitudinal direction belly side end of the joined part in the longitudinal direction and the central position in the longitudinal direction of the underpants type disposable diaper. The pants-type disposable diaper according to any one of claims 1 to 3,
The absorber has a constricted portion between both end portions of the absorber in the longitudinal direction,
The pants-type disposable diaper characterized in that the constricted part has a narrow part where the width in the lateral direction is the narrowest at least at the central position in the longitudinal direction of the absorber. The pants-type disposable diaper according to claim 4,
A pants-type disposable diaper characterized in that, in the longitudinal direction, the high-rigidity part and the narrow part of the absorber overlap. The pants-type disposable diaper according to claim 4 or 5,
A pants-type disposable diaper, characterized in that, in the longitudinal direction, the joint and the narrow part of the absorber overlap. The pants-type disposable diaper according to any one of claims 1 to 6,
On the back side in the longitudinal direction, a leg-hole elastic member that expands and contracts in the lateral direction is disposed,
The leg elastic member is
In the central portion in the lateral direction, a linear portion arranged along the lateral direction so as to overlap with the absorber in the thickness direction;
A curved portion arranged so as to be curved from both lateral sides of the straight portion to the lateral outer side and the longitudinal back side;
With
The absorbent article, wherein the leak-proof wall and the leg-hole elastic member have a portion that intersects the thickness direction. The pants-type disposable diaper according to claim 7,
The absorbent article, wherein the joint portion and the leg-hole elastic member have a portion that intersects the thickness direction. A pants-type disposable diaper according to any one of claims 1 to 8,
The absorber has a constricted portion between both end portions of the absorber in the longitudinal direction,
The pair of joint portions do not overlap the absorber in the thickness direction,
The pants-type disposable diaper characterized in that, in the lateral direction, a distance between the pair of joint portions is shorter than a length at both end portions in the longitudinal direction of the absorbent body.

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