JP2015221236A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a gap between the legs of a wearer and an absorbent body in a 3-piece type diaper including the absorbent body having a constricted part in the intermediate part in the longer direction.SOLUTION: An absorbent article includes an absorbent body 10, an abdominal side belt member 30a and a back side belt member 30b. The abdominal side belt member and the back side belt member are each arranged with an elastic member 35 which expands and contracts along the transverse direction. The absorbent body has an absorbent core 11, and a liquid impermeable leak proof sheet. The absorbent core has a constricted part 11c between an abdominal side end part 11a and a back side end part 11b. The elastic member 35b provided on the back side belt member has a part which becomes discontinuous between one end part in the transverse direction and the other end part. In the elastic members provided on the back side belt member in the longitudinal direction, the number of elastic members arranged in a position overlapping on the constricted part is smaller than that of the elastic members arranged in a position overlapping on the non-constricted back side end part.

Description

  The present invention relates to an absorbent article.

  A three-piece type disposable diaper is known as an absorbent article that absorbs excrement. In a three-piece type disposable diaper, generally, an absorbent main body that is applied to the crotch of the wearer to absorb excrement, a ventral belt member that covers the wearer's ventral side, and a back side of the wearer is covered. And a backside belt member. In such a three-piece type disposable diaper, an invention relating to a diaper in which the longitudinal intermediate portion of the absorbent main body is constricted and the shape of the absorbent main body is substantially hourglass-shaped is disclosed (for example, Patent Document 1). .

JP 2008-253285 A

  In a disposable diaper having a substantially hourglass-shaped absorbent main body as in Patent Document 1, it is difficult for the wearer's leg to move back and forth. Further, by adjusting the arrangement of the constricted portion, it is possible to reduce the force applied to the absorbent main body when the leg is moved back and forth, and to suppress the deterioration of the fit.

  However, the presence of the constricted portion in the absorbent main body may easily cause a gap between the constricted portion and the wearer's leg. When such a gap is generated, there is a risk of excretion leaking from the gap. In particular, when the wearer is an infant, the diaper is often worn in a sleeping position, and the legs are often bent forward in the sleeping position. There was a problem that things were easy to leak.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a wearer in a three-piece type diaper having an absorbent main body having a constricted portion at an intermediate portion in a longitudinal direction. It is in suppressing that a gap is generated between the leg and the absorbent main body.

The main invention for achieving the above object is:
An absorbent article having a longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorptive body provided along the longitudinal direction to absorb excrement;
A ventral belt member provided along the lateral direction, wherein the longitudinal central portion is fixed to the one end while covering the longitudinal end of the absorbent body from the non-skin side of the absorbent body; ,
It is provided along the lateral direction as a separate member from the ventral belt member, and covers the other end portion in the longitudinal direction of the absorbent main body from the non-skin side of the absorbent main body to the other end portion in the lateral direction. And a dorsal belt member to which the central part of the
The ventral belt member and the back belt member are each provided with an elastic member that expands and contracts along the lateral direction,
The ventral band member has ventral band member side edges on both lateral edges, and the dorsal belt member has dorsal band member side edges on both lateral edges, and the ventral band member side edges; The absorbent article is formed into a cylindrical shape by joining the back side band member side edge,
The absorbent main body has an absorbent core formed by laminating a liquid absorbent material, and a liquid-impermeable leak-proof sheet that covers the absorbent core from the non-skin side of the absorbent core,
The absorbent core has a constricted portion having a narrower width in the lateral direction than the ventral end and the dorsal end between the ventral end and the dorsal end,
At least a portion of the back band member side edge overlaps with the constricted portion in the longitudinal direction ,
The elastic member provided on the back band member has a discontinuous portion from one end to the other end in the lateral direction,
In the longitudinal direction, among the elastic members provided on the dorsal belt member, the number of the elastic members arranged at positions overlapping with the constricted portions overlaps with the dorsal end portions not constricted. It is an absorptive article characterized by being fewer than the number of the elastic members arranged at a position .
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, it can suppress that a clearance gap produces between a wearer's leg and an absorptive main body in a 3 piece type diaper provided with the absorptive main body which has a constriction part in the intermediate part of a longitudinal direction. .

It is a schematic perspective view of the 3 piece type disposable diaper (diaper 1) concerning this embodiment. It is the schematic plan view which looked at the same diaper 1 of the unfolded state from the skin side. It is the schematic plan view which looked at the same diaper 1 from the non-skin side. 4A is a cross-sectional view taken along line AA and CC in FIG. 2, and FIG. 4B is a cross-sectional view taken along line BB in FIG. It is a figure explaining the positional relationship of the constriction part of the absorptive core 11 in this embodiment, and the back | dorsal band member 30b. It is a figure explaining the positional relationship of the constriction part of the absorptive core 11 in a comparative example, and the back | dorsal band member 30b. It is a schematic plan view explaining the example in which the elastic member 35 exists in center part ADcc.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An absorbent article having a longitudinal direction and a transverse direction intersecting with the longitudinal direction, the absorbent article being provided along the longitudinal direction and absorbing excrement, and provided along the transverse direction A ventral belt member in which the central portion in the lateral direction is fixed to the one end while covering the longitudinal end of the absorbent main body from the non-skin side of the absorbent main body, and the ventral belt member Provided along the lateral direction as a separate member, the central portion in the lateral direction is fixed to the other end while covering the other end in the longitudinal direction of the absorbent main body from the non-skin side of the absorbent main body. An elastic member that expands and contracts along the lateral direction is disposed on each of the ventral band member and the dorsal band member, and the ventral band member is provided on both lateral edges of the ventral band. A member side edge, and the dorsal belt member has a dorsal belt on both lateral edges. The absorbent article is formed into a cylindrical shape by joining the belly side band member side edge and the back side band member side edge, and the absorbent main body is a liquid absorbent material. And a liquid-impermeable leak-proof sheet that covers the absorbent core from the non-skin side of the absorbent core, and the absorbent core has a ventral end portion and a dorsal side. Between the end portion, there is a constricted portion having a narrower width in the lateral direction than the ventral end portion and the dorsal end portion, and at least a part of the dorsal band member side edge portion in the longitudinal direction An absorbent article, characterized in that the position overlaps the constricted part.

  According to such an absorbent article, it can implement | achieve suppressing that a clearance gap produces between a wearer's leg and an absorptive main body.

  In such an absorbent article, the elastic member disposed at a position overlapping with the constricted portion in the longitudinal direction is between one end portion and the other end portion in the lateral direction of the ventral belt member, or the It is desirable to have a non-continuous portion between one end and the other end in the lateral direction of the dorsal belt member, or both.

  According to such an absorbent article, since the contraction force by the band elastic body acting in the lateral direction of the absorbent core is suppressed, generation of wrinkles of the absorbent core can be prevented.

  In such an absorbent article, the elastic member disposed at a position overlapping with the constricted portion in the longitudinal direction is at least between one end portion and the other end portion in the lateral direction of the ventral belt member. It is desirable to have a non-continuous part.

  According to such an absorbent article, by preventing the lateral stretching force from acting on the region on the back side of the absorbent core, at least the region does not cause wrinkles on the absorbent core and the infant sleeps. When wearing diapers in a posture, the back can be prevented from hurting.

  In such an absorbent article, the back band member side edge portion has a region whose position overlaps with the absorbent core in the vertical direction, and the length of the overlapping region in the vertical direction is the back band. It is desirable that it is half or more of the length in the longitudinal direction of the member side edge.

  According to such an absorbent article, the stretching force by the abdominal band elastic member and the dorsal band elastic member easily acts on the back side (buttock side) region of the absorbent core, so that the absorbent core can be worn when wearing a diaper. The position can be made difficult to shift.

  Such an absorbent article, wherein the elastic member is disposed in the stretched part of the leg-around elastic member disposed along the longitudinal direction outside the absorbent core and in the back side belt member. It is desirable that the length in the vertical direction of the region intersecting with the member is not less than half of the length in the vertical direction of the side portion of the back band member.

  According to such an absorbent article, since the tensile force in the lateral direction by the elastic member provided on the belt part acts greatly on the effective length range of the elastic member around the leg, the fitting property of the diaper is further increased. Can do.

  In this absorbent article, the non-skin side surface of the back band member is provided with a tape member for holding the absorbent article in a rolled state when the absorbent article is discarded, and the tape It is desirable that the member and the absorbent core are disposed at a position where at least a part thereof overlaps in the longitudinal direction.

  According to such an absorbent article, the feel of the post-processing tape is worn by the absorbent core having a thickness in the thickness direction between the wearer's skin (buttock) and the post-processing tape functioning as a cushion. It is difficult to convey to the person's skin (buttock), and the wearer is prevented from feeling uncomfortable.

  In this absorbent article, it is desirable that the longitudinal length of the back band member is longer than the longitudinal length of the ventral band member.

  According to such an absorbent article, the area of the back side band member is larger than that of the abdominal side band member, and the wearer's buttocks can be covered widely.

  In this absorbent article, it is desirable that the longitudinal upper end of the back band member and the longitudinal lower end of the back band member are parallel to each other.

  According to such an absorbent article, compared with the case where the leg periphery opening is slanted, the back side band member is less likely to be turned when the diaper is worn, and the wearer's buttocks are easily prevented from being exposed.

  In this absorbent article, the absorbent main body has a sheet-like surface sheet member that covers the absorbent core from the skin side, and each end portion in the lateral direction of the surface sheet member is formed by the surface sheet member. Each of the absorbent cores is formed to be higher than the standing height of the leak-proof wall portions formed at the positions of the ventral end portion and the dorsal end portion of the absorbent core. It is desirable that the standing height of the leak-proof wall formed at the position of the constriction is higher.

  According to such an absorbent article, excrement can be made difficult to leak by forming the leak-proof wall portion (three-dimensional gather LSG) high in the constricted portion of the absorbent core where gaps are easily formed.

=== Embodiment ===
<Composition of disposable diapers>
FIG. 1 is a schematic perspective view of a three-piece type disposable diaper (diaper 1) as an example of the absorbent article of the present embodiment. FIG. 2 is a schematic plan view of the unfolded diaper 1 as seen from the skin side. FIG. 3 is a schematic plan view of the diaper 1 viewed from the non-skin side. 4A is an AA sectional view and a CC sectional view in FIG. 2, and FIG. 4B is a BB sectional view in FIG.

  As shown in FIGS. 2, 4A, and 4B, the diaper 1 has a vertical direction, a horizontal direction, and a thickness direction as three directions orthogonal to each other. Moreover, since the diaper 1 is a so-called three-piece type, it has three parts 10, 30a, 30b. That is, this diaper 1 has an absorbent main body 10 that is applied to the crotch part of the wearer and absorbs excrement such as urine as the first part, and the abdomen part of the wearer as the second part. It has an abdominal band member 30a that covers it, and a back band member 30b that covers the back side of the wearer as a third part. In the unfolded state of FIG. 2, the abdominal band member 30 a and the back band member 30 b are arranged in parallel with a space in the vertical direction, while the absorbent main body 10 is stretched between them. End portions 10ea and 10eb in the longitudinal direction of the absorbent main body 10 are bonded and fixed to the nearest belt members 30a and 30b, respectively, and the external shape thereof is substantially H-shaped in plan view. And from this state, the absorptive main body 10 is folded in half with the substantially central portion C10 in the longitudinal direction as a folding position. The abdominal band member side edge 30ae, the back side band member side edge 30be, and the abdominal band member side edge 30be, which are portions where the abdominal band member 30a and the back side band member 30b facing each other in the folded state should contact the wearer's flank When joined and connected at each end (that is, each end in the lateral direction), the band members 30a and 30b are formed in an annular shape. Thereby, it becomes the diaper 1 of the wearing condition in which the trunk periphery opening 1HB and a pair of leg periphery opening 1HL as shown in FIG. 1 were formed.

  In addition, various connection structures are employable as a connection structure which connects the above-mentioned ventral band member side edge part 30ae and back | dorsal band member side edge part 30be. For example, if a non-removable connection structure such as welding is used, a pants-type diaper can be formed, while if a detachable connection structure such as a fastening tape member (not shown) is used, an open-type diaper is used. Can be. Incidentally, in this example, the former connection structure is used, and thereby the diaper 1 of the present embodiment is a pants type.

  In the following description, the longitudinal direction, the lateral direction, and the thickness direction of the diaper 1 are simply referred to as “vertical direction”, “lateral direction”, and “thickness direction”, respectively. Regarding the thickness direction, the side in contact with the wearer is also referred to as “skin side”, and the opposite side is also referred to as “non-skin side”.

  Hereinafter, the three components 10, 30a and 30b of the diaper 1 will be described with reference to FIGS. 1 to 4B.

  As shown in FIGS. 2 and 4B, the absorbent main body 10 includes an absorbent core 11, a surface sheet member 13 that covers the absorbent core 11 from the skin side of the core 11, and the absorbent core 11 of the core 11. And a back sheet member 15 that covers the non-skin side and forms the exterior of the absorbent main body 10.

  The absorbent core 11 is a member formed by laminating liquid absorbent materials, and can absorb excrement such as urine. As the liquid absorbent material, for example, liquid absorbent fibers such as pulp fibers can be used. In addition, the absorptive core 11 may contain, for example, a superabsorbent polymer as a liquid absorptive granule, or contains a liquid absorptive material other than a liquid absorptive fiber and a liquid absorptive granule. Also good. Moreover, the absorptive core 11 may be coat | covered with liquid permeable sheets (not shown), such as tissue paper.

  The absorptive core 11 of this embodiment has a ventral end 11a that is an end region on the upper side in FIG. 2 and a back end 11b that is an end region on the lower side in FIG. . And between the abdominal side edge part 11a and the back | dorsal side edge part 11b, it has the narrow part 11c whose width | variety of a horizontal direction is narrower than the abdominal side edge part 11a and the back side edge part 11b. Thereby, the absorptive core 11 is comprised so that it may become a substantially hourglass shape in planar view as shown in FIG. By providing the constricted part 11c in the absorbent core 11, interference between the leg of the wearer of the diaper 1 and the absorbent core 11 can be reduced, and the wearer can easily move the leg when the diaper 1 is worn. .

  The surface sheet member 13 is a sheet-like member that covers the absorbent core 11 from the skin side, and is, for example, a liquid-permeable nonwoven fabric having a larger planar size than the absorbent core 11 (see FIG. 4B). Further, the back sheet member 15 is a sheet-like member that covers the absorbent core 11 from the non-skin side, and is a planar sheet that is larger than the absorbent core 11, and an example thereof is liquid such as polyethylene or polypropylene. A sheet having a two-layer structure in which a permeable leak-proof sheet 15a and an exterior sheet 15b such as a nonwoven fabric are bonded to each other can be used. And in the state which inserted the absorptive core 11 between these back surface sheet members 15 and the top surface sheet member 13, in the part which protrudes outside from the four sides of the absorptive core 11, the leak-proof sheet 15a of the back surface sheet member 15 and The top sheet member 13 is bonded together in a frame shape, whereby the absorbent main body 10 is generally formed.

  In the diaper 1, as shown in FIGS. 1, 2, and 4B, so-called three-dimensional gathers LSG and leg gathers LG are formed by the exterior sheet 15b. The three-dimensional gather LSG is a leak-proof wall portion provided upright at each lateral end portion of the top sheet member 13, while the leg gathers LG are formed in the leg-openings 1 HL and 1 HL of the diaper 1. It is a leg-around elastic part to be formed. The exterior sheet 15b will be described in detail. First, as shown in FIG. 4B, the lateral dimension of the exterior sheet 15b is made sufficiently larger than the leak-proof sheet 15a. That is, the exterior sheet 15b is made of the leak-proof sheet 15a. It protrudes laterally from both lateral sides. Then, the protruding portion 15bf is folded back to the lateral center with the position forming the lateral end 10es of the absorbent body 10 being the folded position, and the rubber thread along the longitudinal direction in the vicinity of the folded position. The leg-surrounding elastic member 17 and the leg-surrounding elastic member 19 such as the leg-surrounding elastic member 19 are fixed in a state of being stretched in the vertical direction, thereby forming the leg-surrounding gather LG. In addition, the leg periphery auxiliary | assistant elastic member 19 is not necessarily required, and the leg periphery gathers LG may be formed only by the leg periphery elastic member 17. FIG. Further, the folded portion 15bg further extends toward the center in the lateral direction, and is joined to the end portion at a position covering the lateral end portion of the top sheet member 13. And the part joined to this end part functions as the base end part LSGb of the three-dimensional gather LSG, that is, the part on the tip side in the lateral direction further than the base end part LSGb serves as the free end part LSGf. 13 can stand up. In addition, an LSG elastic member 18 such as a thread rubber is fixed to the distal end portion of the free end portion LSGf in a state of being extended in the vertical direction along the vertical direction. Therefore, due to the contraction of the LSG elastic member 18 in the vertical direction, the absorbent main body 10 is bent in the vertical direction so that the surface sheet member 13 side becomes the inner peripheral side. The free end portion LSGf contracts in the vertical direction and rises from the top sheet member 13 due to the contraction force, whereby the free end portion LSGf functions as a three-dimensional gather LSG.

  In the present embodiment, since the absorbent core 11 has a substantially hourglass shape having a constricted portion, the standing height of the three-dimensional gather LSG varies depending on the width of the constricted portion in the lateral direction. Specifically, the wider the lateral width of the absorbent core 11, the shorter the portion 15bf protruding in the lateral direction described above, and the standing height of the three-dimensional gather LSG becomes lower. Conversely, as the lateral width of the absorbent core 11 is narrower, the portion 15bf protruding in the lateral direction is higher, and the standing height of the three-dimensional gather LSG is higher. Therefore, the constricted portion 11c having the narrow width in the lateral direction of the absorbent core 11 is higher in the standing height of the three-dimensional gather LSG than the ventral end portion 11a or the back end portion 11b in which the lateral width of the absorbent core 11 is wide. The height increases. Thereby, solid gather LSG is shape | molded highly in the constriction part which is easy to make a clearance gap, and excrement can be made hard to leak.

  Although not shown, depending on the case, liquid permeation of tissue paper or the like as a second sheet may be provided between the top sheet member 13 and the absorbent core 11 or between the back sheet member 15 and the absorbent core 11. A sex sheet may be interposed.

  As shown in FIG. 2, the ventral side band member 30 a and the back side band member 30 b are both sheet members having a substantially rectangular shape in plan view made of a flexible sheet such as a nonwoven fabric. Here, as shown to FIG. 4A and FIG. 4B, the ventral | abdominal band member 30a and the back | dorsal band member 30b are formed by joining the nonwoven fabrics 31 and 32 in two sheets. The ventral belt member 30a and the back belt member 30b are respectively centered in the lateral direction 30ac and 30bc while covering the longitudinal ends 10ea and 10eb of the absorbent main body 10 from the non-skin side of the absorbent main body 10. The central portions 30ac and 30bc of the band members 30a and 30b are overlapped and joined to the end portions 10ea and 10eb. The two nonwoven fabrics 31 and 32 do not have to be the same size.

  Moreover, in the diaper 1 of this embodiment, the longitudinal direction length (short direction length) of the back side belt member 30b is longer than the longitudinal direction length (short direction length) of the ventral side band member 30a. On the other hand, the lateral length of the ventral band member 30a is substantially the same as the lateral length of the dorsal band member 30b. That is, the area of the back side band member 30b is larger than that of the abdominal side band member 30a, so that the wearer's buttocks can be covered widely. Further, the shape of the back band member 30b is substantially rectangular, and the upper end and the lower end in the vertical direction are parallel to each other. Therefore, the opening edge of the waist opening 1HB and the opening edge of the leg opening 1HL in the back band member 30b are also parallel. Thereby, compared with the case where the leg periphery opening is slanted, when wearing the diaper 1, the dorsal belt member is less likely to be turned over, and it is easy to suppress the buttocks from being exposed.

  The superposition of the absorbent main body 10 on the central portion 30ac of the ventral side band member 30a and the central portion 30bc of the back side band member 30b is the vertical end portion 30ae2 of the ventral side band member 30a and the vertical end portion of the back side band member 30b. The absorbent main body 10 is not overlapped with 30be2, but the absorbent main body 10 is overlapped with the central portions 30ac2 and 30bc2 in the vertical direction with respect to the end portions 30ae2 and 30be2 (see FIG. 2). As a result, the longitudinal end portions 30ae2 and 30be2 of the ventral belt member 30a and the back belt member 30b are formed as portions 30ae2 and 30be2 where the absorbent main body 10 does not overlap at all over the entire length in the lateral direction. . The non-overlapping portions 30ae2 and 30be2 constitute the waist opening 1HB (FIG. 1) of the diaper 1. Therefore, the elastic members 35 described later are provided in the portions 30ae2 and 30be2 in the portions 30ae2 and 30be2. It is provided continuously over substantially the entire length in the lateral direction.

  As shown in FIG. 2, FIG. 4A, and FIG. 4B, a plurality of elastic members 35 such as thread rubber along the lateral direction are provided between the two nonwoven fabrics 31 and 32 related to the band members 30a and 30b. 35 ... are inserted and fixed to the nonwoven fabrics 31 and 32 in a state of being stretched in the lateral direction while being inserted, thereby giving the ventral belt member 30a and the back belt member 30b lateral stretchability, respectively. Has been. In addition, the plurality of elastic members 35, 35... Are provided side by side in the vertical direction with an interval in the vertical direction. In this specification, the elastic member 35 provided on the ventral band member 30a is referred to as the ventral band elastic member 35a, and the elastic member 35 provided on the back side band member 30b is referred to as the dorsal band elastic member 35b. The basic structure of the elastic member 35 is substantially the same except for detailed specifications such as thickness, number, and vertical arrangement position. Therefore, below, the abdominal band elastic member 35a provided in the abdominal band member 30a will be described, and the description of the back side band member 30b provided in the back side band member 30b may be omitted. This also applies to all configurations related to the back band member 30b.

  In the following, for convenience of explanation, as shown in FIG. 3, the side band member 30a and the back side band member 30b are each divided into two areas AU and AD in the vertical direction, and each of the two areas aligned in the vertical direction. AU and AD are referred to as “upper region AU” and “lower region AD” as they go from the vertical end to the center. As can be seen with reference to FIG. 3, the regions AU and AD are both strip-shaped regions along the horizontal direction.

  The upper region AU is a portion constituting the waist opening 1HB of the diaper 1, and the region AU is a region in which the absorbent main body 10 (absorbent core 11) is not overlapped at all over the entire length in the lateral direction. It is. And in this upper region AU, while the ventral band elastic member 35a (back side band elastic member 35b) is continuously arranged over substantially the entire length from one end to the other end in the lateral direction in the region AU, It is fixed in a stretched state in the lateral direction. Therefore, the upper region AU is given lateral stretchability over substantially the entire length in the lateral direction based on the ventral belt elastic member 35a, and this stretchability is the stretchability of the waistline opening 1HB of the diaper 1. It becomes.

  The lower region AD is a region where a portion 10p of the absorbent main body 10 where the absorbent core 11 is present is overlapped and fixed to the lateral central portion ADc. In the lower region AD, the absorbent main body 10 is not superimposed on the portions ADe and ADe located on both sides of the central portion ADc.

  Further, in each of the portions ADe, ADe, the elastic member 35 is continuously extended over substantially the entire length from one end portion to the other end portion in the lateral direction of the portion ADe, and extends downward in the lateral direction. It is fixed with. Thereby, the stretchability in the lateral direction is given to each of the portions ADe, ADe over substantially the entire length in the lateral direction.

  On the other hand, the elastic member 35 is discontinuously arranged in the lateral direction in the central portion ADc. Specifically, in this example, the end portions of the elastic member 35 are located at both end portions ADce, ADce in the lateral direction of the central portion ADc. The elastic member 35 is not present in the central portion ADcc. Therefore, in the central portion ADc, the elastic member 35 is disposed discontinuously in the lateral direction. When the elastic member 35 is not present in the central portion ADcc of the central portion ADc as described above, the central portion ADcc is hardly provided with stretchability, and thus the lateral contraction of the central portion ADcc is suppressed. Is done. And in connection with this, since the shrinkage | contraction of the horizontal direction of the absorptive core 11 is also suppressed, generation | occurrence | production of the wrinkle of the said absorptive core 11 is also prevented, and the skin side surface of the absorptive core 11 is maintained substantially flat. And as a result, the liquid absorption inhibition of the absorptive core 11 can be prevented effectively, and the leakage of excrement caused by the occurrence of wrinkles can also be suppressed.

  In the present embodiment, the lateral length Wa of the portion where the ventral band elastic member 35a is arranged in the both ends ADce in the lateral direction of the ventral band member 30a is equal to the both ends ADce in the lateral direction of the dorsal band member 30b. It is longer than the lateral length Wb of the portion where the back band elastic member 35b is disposed. In other words, the lateral length of the portion of the ventral belt elastic member 35a that overlaps the absorbent core 11 is longer than the lateral length of the portion of the backside belt elastic member 35b that overlaps the absorbent core 11. . The effect of such an arrangement will be described with reference to FIG.

  Further, as shown in FIG. 3, an illustration sheet 40 on which an illustration (not shown) such as an animal is formed is provided in the central portion ADc of the lower region AD. For the same reason as above, this illustration is provided. Generation of wrinkles of the sheet 40 is also suppressed. Therefore, the illustration becomes easy to see.

  Further, as shown in FIG. 3, a post-treatment tape 50 is provided on the non-skin side surface of the back band member 30b. The post-processing tape 50 is an elongated tape-like member (tape member) having an adhesive surface, and is fixed to the back band member 30b in a folded state with the adhesive surface inside. When the diaper 1 after use is discarded, the folded post-treatment tape 50 is extended with respect to the diaper 1 rolled in the vertical direction so that the absorbent main body 10 is on the inner side, and the diaper is placed on the adhesive surface side. By winding it around 1, the diaper 1 can be held in a rolled state. Thereby, the diaper 1 can be discarded, without making the excrement etc. which adhered to the inside (absorbent main body 10) of the diaper 1 leak outside.

<About the positional relationship between the constricted portion 11c and the band member side edge>
In the diaper 1 of the present embodiment, the leg of the wearer and the absorbent main body 10 are worn when the diaper is worn by adjusting the joining position of the back band member 30b to the absorbent main body 10 (particularly the constricted portion 11c of the absorbent core 11). A gap is less likely to occur between (absorbent core 11). Hereinafter, a description will be given using a comparative example.

  FIG. 5 is a diagram for explaining the positional relationship between the constricted portion of the absorbent core 11 and the back band member 30b in the present embodiment. FIG. 6 is a view for explaining the positional relationship between the constricted portion of the absorbent core 11 and the back band member 30b in the comparative example.

  As described above, in the diaper 1, the abdominal band member side edge 30ae and the back band member side edge 30be are joined to form the abdominal band member 30a and the back band member 30b in an annular shape, as shown in FIG. It becomes a pants-type diaper. At that time, the abdominal band elastic member 35a provided on the abdominal band member 30a and the dorsal band elastic member 35b provided on the back side band member 30b are connected via the joint portion of the band member side edge portions 30ae and 30be. Thus, the expansion and contraction forces act on each other. Therefore, in the waist opening 1HB of the diaper 1, a stretching force along the lateral direction is generated by the abdominal band elastic member 35a and the back band elastic member 35b. The opening 1HB comes into close contact with the wearer's torso due to the stretching force, and the position of the diaper 1 is less likely to shift when worn. Moreover, since the abdominal belt elastic member 35a and the back belt elastic member 35b respectively pull the absorbent main body 10 in the lateral direction, the absorbent main body 10 is widened outward in the lateral direction, and can widely cover the crotch portion of the wearer. That is, by joining the abdominal band member side edge 30ae and the back side band member side edge 30be, the lateral direction by the abdominal band elastic member 35a and the back band elastic member 35b in a wide range of the band members 30a and 30b. Stretching force comes to work.

  By the way, the absorptive core 11 of this embodiment has a constriction part in the intermediate part (between the abdominal side edge part 11a and the back side edge part 11b) in the vertical direction in FIG. Interference between both side portions of the absorbent core 11 and the legs of the wearer is suppressed, so that the wearer can easily move the legs. On the other hand, since the absorbent core 11 has a narrower width in the constricted portion than the ventral end portion 11a and the dorsal end portion 11b, there is a gap between the absorbent core 11 and the wearer's leg in the narrow region. There is a problem that it tends to occur. And when a clearance gap arises between a wearer's leg and the absorptive core 11, there exists a possibility that the excretion excreted in the absorptive core 11 may leak outside from the said clearance gap. In particular, in the case of an infant who often wears the diaper 1 in the sleeping position, a gap is likely to be generated on the buttock side by an operation such as moving a leg.

  On the other hand, in the diaper 1 of the present embodiment, as shown in FIG. 5, the back band elastic member 35 b has a region overlapping the constricted portion 11 c of the absorbent core 11, thereby making it difficult to generate this gap. ing. In other words, a part of the back band member side edge 30be overlaps with the constricted portion 11c of the absorbent core 11 in the vertical direction, thereby making it difficult to generate a gap. This is because, in the constricted portion 11c of the absorbent core 11, the expansion and contraction in the lateral direction by the ventral band elastic member 35a and the back band elastic member 35b as described above with respect to the region overlapping with the back band member side edge 30be. This is because a force acts and the constricted portion 11c is easily pulled in the lateral direction by being pulled outward in the lateral direction. Therefore, it is suppressed that a clearance gap arises between a wearer's leg and the absorptive core 11. FIG.

  On the other hand, as shown in FIG. 6, in the diaper 1 of the comparative example, the position of the back side band member side edge 30be of the back side band member 30b does not overlap with the constricted part 11c of the absorbent core 11 in the vertical direction. In this case, the elastic force in the lateral direction by the ventral band elastic member 35a and the back band elastic member 35b does not act on the constricted portion 11c of the absorbent core 11, and the constricted portion 11c is not pulled outward in the lateral direction. . Therefore, a gap is still likely to occur between the wearer's leg and the absorbent core 11.

  As described above, in the present embodiment, at least a part of the back band member side edge 30be and the constricted portion 11c of the absorbent core 11 are overlapped in the vertical direction, so that the constricted portion 11c is overlapped. The constriction part by the ventral | abdominal band elastic member 35a and the back | dorsal band elastic member 35b is made to act, and the constriction part of the absorptive core 11 can be widened laterally. Thereby, it can be made hard to produce a clearance gap between a wearer's leg and the absorptive core 11. FIG.

  In addition, the area | region where the expansion-contraction force of the ventral | abdominal band elastic member 35a and the back | dorsal band elastic member 35b acts is not restricted only to the constriction part 11c of the absorptive core 11. FIG. In the case of FIG. 5, the back side end portion 11 b of the absorbent core 11 also has a region overlapping with a part of the back side band member side edge portion 30 be in the vertical direction. Accordingly, a force pulling outward in the lateral direction also acts on the back end portion 11b. For example, even when the buttocks side of the absorbent core 11 becomes heavy due to defecation or the like, the position of the absorbent core 11 is not easily displaced by the back end portion 11b being pulled laterally outward (that is, the waistline direction). In the present embodiment, the length of the overlapping region in the vertical direction between the back band member side edge 30be and the absorbent core 11 is at least half (1/2) or more of the vertical length of the back band member side edge 30be. (See FIG. 5). By overlapping with the absorbent core 11 in more than half of the back side band member side edge 30be, the ventral side band elastic member 35a and the back side band elastic member are formed in the back side (buttock side) region of the absorbent core 11. The expansion / contraction force due to 35b is sufficiently likely to act.

<About other effects on diaper 1>
In the diaper 1, the back band elastic member 35 b (ventral band elastic member 35 a) is longitudinal in both lateral ends of the absorbent main body 10 in ADe (see FIG. 3) located on both lateral sides of the lower region AD. The leg elastic member 17 and the leg auxiliary elastic member 19 are provided so as to intersect with a part of the leg elastic member 17 provided in a stretched state. Here, the length in the vertical direction of a region where the ventral belt elastic member 35a intersects with the leg-surrounding elastic member 17 and the leg-surrounding auxiliary elastic member 19 is defined as La. Similarly, the length in the vertical direction of the region where the back band elastic member 35b intersects the leg-surrounding elastic member 17 and the leg-surrounding auxiliary elastic member 19 is defined as Lb.

  In such a crossing region, when the diaper 1 is worn, the leg elastic member 17 and the leg auxiliary elastic member 19 pull the absorbent main body 10 in the vertical direction, and the back belt elastic member 35b (ventral belt elastic member). The force which pulls the absorptive main body 10 sideways by 35a) acts. That is, the force which makes the absorptive main body 10 (absorbent core 11) contact | adhere with respect to a wearer's body acts.

  Note that the leg-surrounding elastic member 17 and the leg-surrounding auxiliary elastic member 19 are not disposed in the stretched state over the entire longitudinal region of the absorbent main body 10, but are disposed in the stretched state in a predetermined region in the longitudinal direction. ing. In the region where the elastic member is arranged in the stretched state, a force that contracts in the longitudinal direction acts on the absorbent main body 10, and in the region where the elastic member is not arranged in the stretched state, it is vertical with respect to the absorbent main body 10. The force that contracts in the direction does not work. In the present specification, the length in the vertical direction of the region where the force contracting in the vertical direction works is also referred to as “effective length” of the leg-hole elastic member 17 and the leg-hole auxiliary elastic member 19. 5 and 6 correspond to the effective lengths of the leg-hole elastic member 17 and the leg-hole auxiliary elastic member 19.

  As shown in FIG. 6, in the comparative example, the length of La, which is the abdominal intersection area, is approximately equal to the length of Lb, which is the dorsal intersection area. Specifically, in the region La in FIG. 6, there are seven ventral belt elastic members 35 a that intersect the effective length portion of the leg-hole elastic member 17, and in the region Lb in FIG. 6, the effective length portion of the leg-hole elastic member 17 There are seven intersecting dorsal belt elastic members 35b. Therefore, in the comparative example, the force acting on the effective length of the leg-surrounding elastic member 17 (the force pulling outward in the lateral direction) acts almost evenly by the back side belt elastic member 35b.

  In the case of the comparative example, the fit of the absorbent main body 10 (absorbent core 11) may be deteriorated on the back side when a person wearing a diaper moves his / her foot. Since humans often move their legs mainly to the front side (abdominal side), the absorbent main body 10 (absorbent core 11) is pulled to the front side (ventral side) each time the wearer moves his legs. Since the contraction force by the ventral band elastic member 35a (back band elastic member 35b) is constant, it is more in the vertical direction than the force pulling the absorbent main body 10 (absorbent core 11) outward in the lateral direction at the buttocks of the wearer. The pulling force becomes dominant and the position of the absorbent main body 10 (absorbent core 11) is likely to shift. In this case, when the back side becomes heavy due to defecation or the like, excrement may leak to the outside from the portion where the absorbent main body 10 (absorbent core 11) is displaced. In particular, when the wearer is a baby or an infant, a diaper is often worn in a sleeping position. Therefore, if there is a gap in the crotch portion on the back side (buttock side), excrement tends to leak out. In addition, if the force pulling outward in the lateral direction on the back side of the absorbent main body 10 (absorbent core 11) is weak, the end 10eb of the absorbent main body 10 tends to be shifted inward in the lateral direction every time the wearer moves his / her foot. Therefore, the absorptive main body 10 (absorbent core 11) is turned up and the buttock is easily exposed.

  In contrast, as shown in FIG. 5, in the present embodiment, the length of Lb, which is the dorsal intersection area, is longer than the length of La, which is the abdominal intersection area. In other words, the region around the leg elastic member 17 (leg around auxiliary elastic member 19) is a region around the leg elastic member 35b where the portion (effective length) in the longitudinally extending state and the dorsal belt elastic member 35b intersect. 17 (the leg-surrounding auxiliary elastic member 19) is larger than a region intersecting the ventral belt elastic member 35a and a portion (effective length) in the longitudinally extended state. Specifically, in the region La in FIG. 5, the number of ventral side elastic members 35a intersecting the effective length portion of the leg elastic member 17 is seven, whereas in the region Lb in FIG. There are ten dorsal band elastic members 35b intersecting the effective length portion, more than seven. Therefore, the force by which the absorbent main body 10 (absorbent core 11) and the leg elastic member 17 are pulled laterally outward by the dorsal band elastic member 35b is greater than the force by which the ventral band elastic member 35a is pulled laterally outward. Also grows. Thereby, in the diaper 1 of this embodiment, the fitting property on the back side can be enhanced.

  In the present embodiment, the effective length of the leg elastic member 17 (leg auxiliary auxiliary elastic member 19) on the back side is at least ½ or more of the longitudinal length of the back band member side edge 30be. Also in FIG. 5, the effective length Lb on the back side of the leg-hole elastic member 17 is more than half of the longitudinal length of the back side band member side edge portion 30be. In the region of the back band member side edge 30be, when the abdominal band member 30a and the back band member 30b are formed in an annular shape, the lateral pulling force by the ventral band elastic member 35a and the back band elastic member 35b works. By enlarging the range which cross | intersects the leg periphery elastic member 17 (leg periphery auxiliary | assistant elastic member 19) in the said area | region, the fitting property of the diaper 1 can be made higher by the effect mentioned above.

  Further, in the diaper 1 of the present embodiment, the lateral length Wa of the portion of the ventral band elastic member 35a that overlaps the absorbent core 11 is the lateral length of the portion of the dorsal band elastic member 35b that overlaps the absorbent core 11. By making it longer than the length Wb (see FIG. 5), the strength of the force with which the absorbent core 11 is pulled outward in the lateral direction can be adjusted. The longer the portion where the elastic member overlaps the absorbent core 11, the stronger the absorbent core 11 is pulled outward in the lateral direction by the elastic member. Therefore, as in the present embodiment, the back band elastic member 35b and the absorbent core 11 By shortening the overlapping portion, the force for pulling the absorbent core 11 directly outward in the lateral direction on the back side is prevented from becoming too strong. Thereby, while maintaining the fit of the absorbent main body 10 in the buttocks, a slight space is formed between the buttocks and the absorbent core 11, and the excreted feces can be held in the space without diffusing. it can. On the other hand, by strengthening the force that pulls the absorbent core 11 directly in the lateral direction on the abdominal side, the absorbent core 11 can be brought into close contact with the body and leakage of excreted urine can be suppressed.

  In the diaper 1 of the present embodiment, the elastic force when the back band elastic member 35b expands and contracts in the lateral direction is larger than the elastic force when the leg elastic member 17 or the leg auxiliary elastic member 19 expands and contracts in the vertical direction. Each elastic member is provided so that is stronger. That is, when the leg elastic member 17 and the leg auxiliary elastic member 19 are attached to the absorbent main body 10, the back band elastic member 35 b is set to be higher than the ratio of extending the leg elastic member 17 and leg auxiliary elastic member 19. Each elastic member is arrange | positioned so that the ratio which expands the back | dorsal band elastic member 35b when bonding to the side band member 30b may become large. Thereby, since the force which spreads the absorptive main body 10 (absorbent core 11) laterally outward works more strongly, the absorptive main body 10 (absorbent core 11) is widened laterally in the wearer's buttocks region or the like, It helps to prevent the excrement from leaking.

  Moreover, in the diaper 1 of this embodiment, when the diaper is worn, it is possible to prevent the post-treatment tape 50 from causing an uncomfortable feeling on the touch on the buttock side. In the diaper 1, the longitudinal length Lb of the region where the back band elastic member 35b and the leg elastic member 17 intersect is the vertical length La of the region where the ventral band elastic member 35a and the leg elastic member 17 intersect. Longer than. That is, the overlapping portion in the vertical direction between the back side band member 30b and the absorbent main body 10 is large. Thereby, the position of the post-processing tape 50 fixed to the non-skin-side surface of the back band member 30b easily overlaps with the position of the absorbent core 11 in the thickness direction (see FIG. 3). In other words, the post-processing tape 50 and the absorbent core 11 are arranged at a position where at least a part thereof overlaps in the vertical direction. When the wearer wears the diaper 1, the absorbent core 11 having a thickness in the thickness direction exists between the wearer's skin (buttock) and the post-treatment tape 50. By functioning as a cushion, it is difficult to convey the feel of the post-processing tape 50 to the wearer's skin (buttock), and it is possible to suppress a sense of discomfort.

=== 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.

  In the above-described embodiment, the elastic member 35a (35b) of the central portion ADc is not used in the ventral belt member 30a (backside belt member 30b) for the purpose of reducing the stretchability of the horizontal central portion ADc of the lower region AD. It was continuous. That is, the elastic member arranged at a position overlapping with the constricted portion 11c of the absorbent core 11 in the vertical direction is arranged so as to be discontinuous in the lateral central portion ADc of the band member. As an example of this discontinuous elastic member, as shown in FIG. 3, elastic members 35 a (35 b) are present at both lateral ends ADce and ADce of the central portion ADc. The configuration in which the elastic member 35a (35b) is not present is illustrated in the horizontal central portion ADcc of the central portion ADc, but is not limited thereto.

  That is, if the elastic member 35a (35b) is discontinuously disposed in the central portion ADc in order to reduce the stretchability of the central portion ADc of the lower region AD, the central portion ADcc of the central portion ADc is further distant from the central portion ADc. The elastic member 35a (35b) may exist. FIG. 7 is a schematic plan view for explaining an example thereof. In FIG. 7, the non-skin-side non-woven fabric 31 of the ventral band member 30 a is removed and the elastic member 35 a is exposed to the outside. In the example of FIG. 7, the elastic member 35a located at the central portion ADcc is in a state of being finely divided. And if it is in this finely divided state, the elastic member 35a will not substantially impart stretchability to the central portion ADcc. Therefore, as long as the elastic member 35a is cut into pieces, it may be present in the central portion ADcc. The length of the elastic member 35a in a chopped state is, for example, greater than 0 mm and not greater than 5 mm, and more desirably greater than 0 mm and not greater than 3 mm. However, if the elastic member 35a is chopped, the appearance deteriorates. Therefore, it is desirable that the elastic member 35D is not present in the central portion ADcc (FIG. 3).

  Moreover, about the back side band member 30b, the back side band elastic member 35b arrange | positioned in the position which overlaps with the constriction part 11c of the absorptive core 11 in the vertical direction continues from one end part of the horizontal direction to the other end part. It may be arranged. The back band elastic member 35b may be continuously arranged over the entire lateral direction (not shown). As a result, a lateral expansion and contraction force is exerted on the central portion ADc by the back band elastic member 35b. When the expansion and contraction force acts on the central portion ADc of the back side band member 30b, the leg elastic member 17 (leg auxiliary auxiliary elastic member 19) and the back side band member 30b are pulled to each other in the portion, and the entire back side band member 30b. Press against the wearer's buttocks. Thereby, the fitting property on the buttock side can be improved. Even in this case, among the ventral band elastic members 35a provided in the ventral band member 30a, those disposed at positions overlapping the constricted portion 11c of the absorbent core 11 in the vertical direction are discontinuous portions in the central portion ADc. Have Even when the baby wears the diaper 1 in the sleeping position without causing wrinkles in the absorbent core 11 in the region by preventing the lateral stretching force from acting on the region on the back side of the absorbent core 11. You can make sure that your back doesn't hurt.

  In the above-described embodiment, the elastic member 35 is discontinuously disposed in the central portion ADc in the lateral direction in the lower region AD in FIG. 3, but the present invention is not limited to this. For example, the elastic member 35 may not be disposed in the central portion ADc. That is, in the example of FIG. 3 described above, the end portion of the elastic member 35 is applied to the center portion ADc at the position of each end portion ADce, ADce in the horizontal direction. It does not have to be at the position of the end portion ADce of ADc.

  In the above-described embodiment, the material of the exterior sheet 15b and the band members 30a and 30b is a non-woven fabric, but is not limited to the non-woven fabric. For example, a woven fabric or a sheet member other than the woven fabric may be used. Incidentally, the exterior sheet 15b may be omitted, and in that case, the leak-proof sheet 15a forms the exterior of the absorbent main body 10.

  In the above-described embodiment, the rubber thread is illustrated as the elastic member 35, but the elastic member 35 is not limited to this. For example, a belt-like rubber may be used as the elastic member 35, a belt-like non-woven fabric having elasticity or a belt-like resin film having elasticity.

1 Diaper (absorbent article), 1HB waist opening, 1HL leg opening,
10 Absorbent body, 10ea end, 10eb end,
10es end, 10p part,
11 Absorbent core,
11a ventral end, 11b dorsal end, 11c constriction,
13 Surface sheet member,
15 Back sheet member,
15a leakage prevention sheet, 15b exterior sheet,
15bf protruding part, 15bg folded part,
17 leg elastic member, 18 LSG elastic member, 19 leg auxiliary elastic member,
30a ventral band member, 30ac center part, 30ac2 part,
30ae ventral band member side edge, 30ae2 end,
30b dorsal belt member, 30bc center part, 30bc2 part,
30be dorsal band member side edge, 30be2 end,
31 nonwoven fabric, 32 nonwoven fabric,
35 elastic member,
35a ventral side elastic band member, 35b dorsal side elastic band member,
40 Illustration sheet,
50 post-processing tape,
AU upper area, AD lower area,
ADc center part, ADcc center part, ADce end part,
ADe part,
LG Leg gathers,
LSG solid gather (leak barrier),
LSGb Base end, LSGf Free end

Claims (6)

An absorbent article having a longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorptive body provided along the longitudinal direction to absorb excrement;
A ventral belt member provided along the lateral direction, wherein the longitudinal central portion is fixed to the one end while covering the longitudinal end of the absorbent body from the non-skin side of the absorbent body; ,
It is provided along the lateral direction as a separate member from the ventral belt member, and covers the other end portion in the longitudinal direction of the absorbent main body from the non-skin side of the absorbent main body to the other end portion in the lateral direction. And a dorsal belt member to which the central part of the
The ventral belt member and the back belt member are each provided with an elastic member that expands and contracts along the lateral direction,
The ventral band member has ventral band member side edges on both lateral edges, and the dorsal belt member has dorsal band member side edges on both lateral edges, and the ventral band member side edges; The absorbent article is formed into a cylindrical shape by joining the back side band member side edge,
The absorbent main body has an absorbent core formed by laminating a liquid absorbent material, and a liquid-impermeable leak-proof sheet that covers the absorbent core from the non-skin side of the absorbent core,
The absorbent core has a constricted portion having a narrower width in the lateral direction than the ventral end and the dorsal end between the ventral end and the dorsal end,
At least a portion of the back band member side edge overlaps with the constricted portion in the longitudinal direction ,
The elastic member provided on the back band member has a discontinuous portion from one end to the other end in the lateral direction,
In the longitudinal direction, among the elastic members provided on the dorsal belt member, the number of the elastic members arranged at positions overlapping with the constricted portions overlaps with the dorsal end portions not constricted. An absorptive article characterized by being less than the number of the elastic members arranged in a position . The absorbent article according to claim 1,
An absorbent article, wherein no elastic member is provided on the non-skin side of the absorbent core. The absorbent article according to claim 1 or 2,
In the longitudinal direction,
The constricted part of the constricted part is located between the ventral band member and the dorsal band member. It is an absorptive article given in any 1 paragraph of Claims 1-3,
In the longitudinal direction,
An absorbent article, wherein a length of an overlapping portion between the constricted portion and the ventral side band member is longer than a length of an overlapping portion between the constricted portion and the back side band member. The absorbent article according to claim 4,
In the longitudinal direction,
Of the elastic members arranged in the ventral band member, the number of elastic members provided at the position where the constriction overlaps,
The absorbent article characterized by being more than the number of the elastic members provided in the position where the constriction part overlaps among the elastic members arranged in the back side belt member. It is an absorptive article given in any 1 paragraph of Claims 1-5,
The region of the leg elastic member arranged in the longitudinal direction outside the absorbent core in the longitudinal direction and the elastic member arranged in the dorsal belt member intersect with the elastic member arranged in the dorsal belt member. The length in the vertical direction is
The absorbent article characterized by being longer than the length in the longitudinal direction of the region where the stretched portion of the elastic member around the leg and the elastic member disposed on the ventral belt member intersect.

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