JP2014117349A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper including a three-dimensional gathers and a leg gathers having high air permeability, flexibility and leakage preventing performance.SOLUTION: A three-dimensional gathers TG and a leg gathers LG of a diaper 1A are formed by a side sheet 24 disposed and fixed through a fixing part 27. The side sheet 24 is formed by one sheet member, the inner end part 24I thereof is turned back to the outside surface side up to the position of the fixed part 27, and an elastic member 25 is disposed and fixed to the apex vicinity 24T1. In the side sheet 24, the outer end part 24O is turned back to the outside surface side up to the position of the fixed part 27, and an elastic member 26 is disposed and fixed at a space S from the apex 24T2. A three-dimensional gathers side non-joint area 28T is formed on the inner side in the X-direction of the side sheet 24, and a leg gathers side non-joint area 28L is formed in the space S on the outer side in the X-direction. The leg gathers side non-joint area 28L is located on the outermost side in the X-direction.

Description

  The present invention relates to a disposable diaper.

  Conventionally, in order to prevent side leakage of urine and loose stool, absorbent articles such as disposable diapers provided with so-called three-dimensional gathers and leg gathers that are raised by the contraction force of elastic members on both sides of the absorbent main body are known. In general, the three-dimensional gathers and the leg gathers are formed using a water-repellent nonwoven fabric, and are required to have air permeability, flexibility, and leakproofness.

As a disposable diaper provided with a three-dimensional gather and a leg gather, the present applicant firstly folded a water-repellent sheet, arranged a stretched elastic member between the folded sheets, and a three-dimensional gather part and a leg flap part rising up. The formed disposable diaper was proposed (refer patent document 1).
Further, as a disposable diaper provided with so-called three-dimensional gathers and leg gathers, for example, Patent Document 2 discloses a containment flap portion (corresponding to a three-dimensional gather) that rises by folding a fabric layer and arranging an elastic member stretched between the folded layers. And disposable diapers having leg gusset portions (corresponding to leg gathers) are described.

JP 2007-20658 A Special Table 2001-520082

  However, the three-dimensional gather part provided in the diaper described in Patent Document 1 is formed by joining the folded sheets together and integrating them. For this reason, if body fluid accumulates at the base of the three-dimensional gathered portion where body fluids such as urine and loose stool tend to collect, it is difficult to sufficiently exhibit the water repellency of the two sheets that make up the three-dimensional gathered portion. There is room for further improvement from the viewpoints of air permeability and air permeability.

  Moreover, the leg gusset part (equivalent to a leg gather) part with which the diaper described in Patent Document 2 is provided is formed by arranging an elastic member at the free tip. Since the free tip portion of the leg gusset portion is the portion that is most likely to come into contact with the wearer's skin, the elastic member of the free tip portion gives the wearer an uncomfortable feeling.

  Therefore, the subject of this invention is providing the disposable diaper which provided the three-dimensional gather and leg gathers with high air permeability, leak-proof property, and flexibility.

  The present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and both side portions along the longitudinal direction of the absorbent main body having a liquid-retaining longitudinal absorbent body interposed between both sheets. A disposable diaper in which a three-dimensional gather and a leg gather are formed by contraction force of an elastic member, wherein the three-dimensional gather and the leg gather are longitudinal directions on both side portions along the longitudinal direction of the top sheet of the absorbent main body. Formed by a hydrophobic side sheet disposed and fixed through a fixing portion extending to the side, and the side sheet is composed of a single sheet member, and on the inner side in the width direction of the sheet member, The inner end portion is folded back to the outer surface side of the sheet member up to the position of the fixed portion, and a plurality of standing members extending in the longitudinal direction are provided in the vicinity of the folded top portion between the folded sheet members. An elastic member for gathering is arranged and fixed, and on the outer side in the width direction of the sheet member, the outer end portion is folded back to the outer surface side of the sheet member up to the position of the fixed portion. A plurality of elastic members for forming leg gathers extending in the longitudinal direction are arranged and fixed at a distance from the folded top portion between the sheet members, and are fixed to the side portion. On the inner side in the width direction than the fixed portion in the sheet, a solid gather-side non-joining region in which an elastic member is not disposed and the sheet members are not fixed is formed near the fixed portion, On the outer side in the width direction from the fixed portion in the side seat, there is a leg gather side non-joined region in which no elastic member is arranged at a distance from the top of the folded back and the sheet member is not fixed. Are, the leg gather side non-bonded region of the side sheet is to provide a disposable diaper which are located outermost in the width direction of the absorbent body.

  ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which provided the three-dimensional gather and leg gathers with high air permeability, leak-proof property, and a softness | flexibility is provided.

FIG. 1 is a perspective view showing a wearing state of the disposable diaper according to the first embodiment of the present invention. FIG. 2 is a developed plan view of the disposable diaper shown in FIG. 3 is a cross-sectional view taken along the line II of FIG. 4 is a cross-sectional view taken along line II-II in FIG. FIG. 5 is a cross-sectional view of the crotch part of the disposable diaper according to the second embodiment of the present invention (corresponding to FIG. 3).

Hereinafter, the present invention will be described based on the preferred first embodiment with reference to the drawings.
As shown in FIG. 2, the disposable diaper 1A of the first embodiment of the present invention (hereinafter also referred to as diaper 1A) includes a liquid-permeable top sheet 21, a liquid-impermeable back sheet 22, and the sheets 21, 22. An absorbent main body 2 having a vertically long absorbent body 23 having liquid retention properties interposed therebetween is provided. As shown in FIG. 2, the diaper 1 </ b> A has an absorptive sheet member 3 </ b> A disposed on the abdomen side of the wearer that bridges and fixes the absorbent main body 2 and both ends 2 a and 2 b in the longitudinal direction of the absorbent main body 2. And the back side sheet member 3B arranged on the back side, both side parts 3a, 3a along the longitudinal direction of the diaper of the abdominal side sheet member 3A and both side parts 3b, 3b of the back side sheet member 3B are joined. As shown in FIG. 1, the pants-type disposable diaper is formed with a pair of side seal portions 4, a waist opening WO, and a pair of leg openings LO, LO.
Moreover, as shown in FIG. 3, the diaper 1A is a diaper in which a three-dimensional gather TG and a leg gather LG are formed on both side portions 2s and 2s along the longitudinal direction of the absorbent main body 2 by the contraction force of the elastic member. is there. This will be specifically described below.

  As shown in FIG. 1 and FIG. 2, the diaper 1 </ b> A includes a ventral side A disposed on the wearer's ventral side, a dorsal side B disposed on the dorsal side of the wearer, and a ventral side when worn. It has a crotch part C which is located between A and the back side part B and is arranged in a wearer's crotch part. Here, the vertical direction of the diaper 1A is a direction (Y direction in the drawing) extending from the abdominal side A through the crotch C to the back side B, and is a state in which the absorbent main body 2 is unfolded and extended. The same direction as the longitudinal direction. Moreover, the width direction of the diaper 1 </ b> A is a direction (X direction in the drawing) orthogonal to the Y direction, and is the same direction as the width direction of the absorbent main body 2. Therefore, in the following description, the longitudinal direction of the diaper or the direction corresponding to the longitudinal direction of the absorbent main body 2 of the diaper is simply the Y direction, the width direction of the diaper, or the direction corresponding to the width direction of the absorbent main body 2 of the diaper. Is also simply referred to as the X direction. In addition, the inner surface of the diaper or the diaper component is a surface directed toward the wearer's skin when worn, and the outer surface of the diaper or diaper is the opposite side of the wearer's skin when worn. It is the surface that is directed to

As shown in FIGS. 2 and 3, the absorbent main body 2 has a surface sheet 21 arranged on the inner surface side (P side in FIG. 3) of the absorber 23, and the outer surface side (Q side in FIG. 3) of the absorber 23. It is formed by arranging a back sheet 22. As shown in FIG. 3, the top sheet 21 has the same planar view shape as the back sheet 22 except that the width in the X direction is small. In the diaper 1A, the back sheet 22 is a liquid-permeable (including water-repellent) leak-proof sheet 22a and a leak-proof sheet 22a fixed to the outer surface side (Q side in FIG. 3) of the leak-proof sheet 22a. And the outer layer nonwoven fabric 22b having a narrower width. The leak-proof sheet 22 a and the outer layer nonwoven fabric 22 b are integrally joined via the outer layer adhesive layer 51. As shown in FIG. 3, the outer nonwoven fabric 22b has the same plan view shape as the leak-proof sheet 22a except that the width in the X direction is narrow. Due to the presence of the outer layer nonwoven fabric 22b, the touch of the outer surface of the diaper is improved. As shown in FIG. 3, in the diaper 1A, the leakproof sheet 22a has both side portions 22as and 22as along the Y direction that are the most fixed portions 27 of the elastic members 26 for forming leg gathers to be described later. It extends to the position of the elastic member 26s close to the center line CL.
The top sheet 21, the leak-proof sheet 22 a, and the outer nonwoven fabric 22 b have a width in the X direction wider than the width in the X direction of the absorbent body 23. The top sheet 21 and the leak-proof sheet 22 a have a length in the Y direction longer than the length in the Y direction of the absorber 23.

  As shown in FIG. 2, the diaper 1 </ b> A is formed symmetrically with respect to the longitudinal center line CL of the absorbent main body 2. Therefore, the form of the three-dimensional gather TG and the leg gather LG formed on the side portion 2s of the absorbent main body 2 described below will be described mainly using the left side of FIGS. 2 and 3 as an example, but the right side is also left and right. It is the same except that it becomes symmetric.

  As shown in FIG. 3, the three-dimensional gather TG and the leg gather LG are arranged on both side portions 21 s and 21 s along the Y direction of the surface sheet 21 of the absorbent main body 2 via fixing portions 27 extending in the Y direction. It is formed from a fixed, hydrophobic side sheet 24. As shown in FIG. 3, the side sheet 24 extends on the inner surface of the side portion 21 s of the topsheet 21 of the absorbent main body 2, that is, outward in the X direction from both side edges along the Y direction of the absorber 23. Via a fixing part 27 formed on the inner surface (P side in FIG. 3) of the surface sheet 21 by applying an adhesive by various known methods or by fusing each other by various known methods. The absorbent main body 2 is disposed over the entire length. The fixing portion 27 is disposed over the entire length of the side seat 24 and the absorbent main body 2.

  As shown in FIG. 3, the side sheet 24 is made of a single hydrophobic sheet member, and the inner end 24I is fixed on the inner side in the width direction (center line CL side) of the sheet member. A plurality of three-dimensional gathers which are folded back to the outer surface side (Q side in FIG. 3) of the sheet member up to the position of the portion 27 and are elongated in the longitudinal direction (Y direction) in the vicinity of the folded top portion 24T1 between the folded sheet members. A forming elastic member 25 is formed and fixed. Here, the plurality of elastic members 25 being arranged in the vicinity of the top 24T1 substantially means that one of the plurality of elastic members 25 for forming a three-dimensional gather is formed at the tip of the folded top 24T1. It means that a plurality of elastic members 25 are intermittently arranged at a predetermined interval from the tip. One or more and five or less elastic members 25 for forming a three-dimensional gather are preferably provided, and two elastic members 25 are provided in the diaper 1A. A region where a plurality of elastic members 25 for forming three-dimensional gathers are arranged and fixed is a region 25T as shown in FIG.

  Further, as shown in FIG. 3, the side sheet 24 is composed of a single hydrophobic sheet member, and the outer end 24 </ b> O is located at the position of the fixing portion 27 on the outer side in the width direction of the sheet member. The sheet member is folded back to the outer surface side (Q side in FIG. 3) until the fixed portion 27 is extended in the longitudinal direction (Y direction) with a space S from the folded top 24T2 between the folded sheet members. A plurality of leg gather forming elastic members 26 are arranged and fixed. In the diaper 1 </ b> A, the side sheet 24 has an outer end portion 24 </ b> O that extends closer to the center line CL beyond the position of the fixing portion 27, as shown in FIG. 3, It is arranged and formed between the outer layer nonwoven fabrics 22b. The sheet member forming the side sheet 24 arranged between the leak-proof sheet 22a and the outer layer nonwoven fabric 22b is bonded to the outer layer nonwoven fabric 22b by the outer layer adhesive layer 51, and the leak-proof sheet 22a by the inner layer adhesive layer 52. It is glued to. A plurality of elastic members 26 for forming leg gathers are intermittently arranged, and specifically, it is preferable that one or more and five or less elastic members 26 are arranged, and two elastic members 26 are arranged in the diaper 1A. . A region where a plurality of leg gathering elastic members 26 are arranged and fixed is a region 26T as shown in FIG.

  The side sheet 24 formed by folding a single sheet member as described above will be described in further detail. As shown in FIG. 3, the fixed side 27 of the side sheet 24 is fixed on the inner side in the X direction. Near the portion 27 (close to the center line CL), there is formed a three-dimensional gather side non-joining region 28T in which no elastic member is arranged and the sheet members are not fixed. The three-dimensional gather side non-joining region 28 </ b> T is formed over the entire length of the side sheet 24 in the Y direction. In the three-dimensional gather side non-joining region 28T, an air layer is easily formed between the folded hydrophobic sheet members. Such a three-dimensional gather-side non-joining region 28T is formed in the diaper 1A, as shown in FIG. 3, between the fixing portion 27 in the side seat 4 and the region 25T in which the three-dimensional gather forming elastic member 25 is disposed and fixed. It extends between. That is, as shown in FIG. 3, the side sheet 24 of the diaper 1A is entirely a three-dimensional gather side non-joining region 28T between the fixing portion 27 and the region 25T.

  Further, as shown in FIG. 3, the elastic member is not arranged in the space S spaced from the folded top portion 24T2 on the outer side in the X direction from the fixing portion 27 in the side seat 24, and the sheet members are fixed. Leg gather-side non-joining regions 28L that are not formed are formed. The leg gather side non-joining region 28 </ b> L is formed over the entire length of the side seat 24 in the Y direction. That is, as shown in FIG. 3, the outer side of the side seat 24 in the X direction is between the folded top 24 </ b> T <b> 2 and the region 26 </ b> T where the elastic member 26 for forming leg gathers is disposed and fixed. It is a joining region 28L. In the leg gather side non-joining region 28L, an air layer is easily formed between the folded hydrophobic sheet members.

  In the side sheet 24 formed as described above, the leg gather side non-joining region 28L of the side sheet 24 is positioned on the outermost side in the width direction (X direction) of the absorbent main body 2 as shown in FIG. Yes. That is, in the absorbent main body 2, the leg gather side non-joining region 28 </ b> L of the side sheet 24 that is the tip side of the leg gather is, as shown in FIG. 3, from the back sheet 22 (leakproof sheet 22 a, outer layer nonwoven fabric 22 b). Also extends outward in the X direction and extends most outward in the X direction.

  The ratio (W2 / W1) (see FIG. 2) of the width W2 of the interval S (leg gather side non-joining region 28L) to the length W1 in the width direction (X direction) of the side sheet 24 formed by folding is an elastic member. 5% or more is preferable, 8% or more is more preferable, 40% or less is more preferable, 30% or less is more preferable, specifically 5% or more and 40% or less is preferable. More preferably, it is 8% or more and 30% or less. Specifically, the width W2 of the interval S is preferably 3 mm or more, more preferably 5 mm or more, more preferably 25 mm or less, still more preferably 20 mm or less, specifically 3 mm or more and 25 mm from the same viewpoint as the above-described ratio. The following is preferable, and it is more preferable that it is 5 mm or more and 20 mm or less.

  As shown in FIG. 3, the width W2 of the interval S (leg gather side non-joining region 28L) is more elastic than the width W4 of the region 26T in which a plurality of leg gathering elastic members 26 are disposed and fixed. From the viewpoint of physical stimulus reduction and appearance production, the width is preferably wide, and the ratio of the width W4 to the width W2 (W4 / W2) is preferably 10% or more, more preferably 20% or more, and preferably 90% or less. 75% or less, more preferably 10% or more and 90% or less, and further preferably 20% or more and 75% or less.

  As shown in FIG. 3, the width W2 of the interval S (leg gather side non-joining region 28L) is such that the outer end in the X direction of the fixing portion 27 and a plurality of elastic members 26 for forming leg gathers are disposed and fixed. From the viewpoint of improving leakage prevention, it is preferable that the distance W5 between the outer region 26T and the outer end in the X direction is narrower. The ratio of the distance W5 to the width W2 (W5 / W2) is 100% or more. Preferably, 200% or more is more preferable, 500% or less is preferable, 400% or less is more preferable, specifically 100% or more and 500% or less is preferable, and 200% or more and 400% or less is further preferable. preferable.

  As shown in FIG. 3, the width W2 of the interval S (leg gather side non-joining region 28L) is such that the outer end in the X direction of the fixing portion 27 and a plurality of elastic members 26 for forming leg gathers are disposed and fixed. From the viewpoint of physical stimulation reduction by the elastic member and appearance appearance, the distance W6 between the inner region 26T and the inner end in the X direction is preferably larger, and the ratio of the distance W6 to the width W2 (W6 / W2) Is preferably 25% or more, more preferably 50% or more, more preferably 99% or less, still more preferably 90% or less, specifically preferably 25% or more and 99% or less, and 50% or more and 90%. More preferably, it is as follows.

  The ratio (W3 / W1) (see FIG. 3) of the width W3 of the three-dimensional gather side non-joining region 28T to the length W1 in the width direction (X direction) of the side sheet 24 that is folded back (see FIG. 3) Therefore, 15% or more is preferable, 25% or more is more preferable, 50% or less is preferable, 45% or less is more preferable, specifically 15% or more and 50% or less is preferable, and 25% or more and 45% is preferable. More preferably, it is as follows. Specifically, the width W3 of the three-dimensional gather side non-joining region 28T is preferably 10 mm or more, more preferably 15 mm or more, preferably 35 mm or less, more preferably 30 mm or less, from the same viewpoint as the ratio described above. Is preferably from 10 mm to 35 mm, more preferably from 15 mm to 30 mm.

  When the side seat 24 formed as described above is worn, the inner side in the X direction is more solid than the fixed portion 27 of the side seat 24 due to the contraction force of the elastic member 25 for forming a three-dimensional gather as shown in FIG. Become a gatherer. Specifically, the folded top portion 24T1 on the inner side in the X direction with respect to the fixing portion 27 of the side seat 24 is separated from the top sheet 21 to form a three-dimensional gather. At the same time, the outer side in the X direction from the fixing portion 27 of the side seat 24 becomes a leg gather due to the contraction force of the elastic member 26 for leg gather formation.

  As described above, the diaper 1 </ b> A is a pants-type disposable diaper as shown in FIGS. 1 and 2, and is disposed on the abdomen side sheet member 3 </ b> A disposed on the wearer's stomach side and on the wearer's back side. The absorptive main body 2 is bridged and fixed to the back sheet member 3B. More specific description will be given below.

  The ventral sheet member 3A has a horizontally long rectangular shape in the X direction when the diaper 1A is expanded and extended (see FIG. 2). Similarly, the back seat member 3B has a horizontally long rectangular shape in the X direction. As shown in FIG. 2, the ventral seat member 3 </ b> A and the back seat member 3 </ b> B have the same shape and the same size, the diaper longitudinal direction (Y direction) is uniform, and the diaper width direction (X direction). Is also uniform in length. In the diaper 1A, as shown in FIG. 2, the ventral sheet member 3A and the back sheet member 3B have the same shape and the same size, the length in the Y direction is uniform, and the length in the X direction is also uniform. is there.

  As shown in FIG. 2, the absorbent main body 2 has one end 2a side in the Y direction fixed to the central region in the X direction of the ventral sheet member 3A via an adhesive, and the other end 2b side in the Y direction is the back side. The sheet member 3B is fixed to the central region in the X direction via an adhesive. The diaper 1 </ b> A includes a horizontally long rectangular covering sheet 36 </ b> A that is narrower (shorter in the Y direction) than the abdominal sheet member 3 </ b> A over the entire length in the X direction of the abdominal sheet member 3 </ b> A. The sheet member 3B includes a horizontally-long covering sheet 36B that is narrower (shorter in the Y direction) than the back sheet member 3B over the entire length in the X direction. As shown in FIG. 2, the covering sheet 36 </ b> A covers the one end 2 a of the absorbent main body 2 and is fixed through an adhesive over the entire length in the X direction of the ventral sheet member 3 </ b> A. Similarly to the cover sheet 36A, the cover sheet 36B covers the other end 2b of the absorbent main body 2 and covers the entire length in the X direction of the back sheet member 3B as shown in FIG. Is fixed through. Thus, since the one end part 2a and the other end part 2b of the absorptive main body 2 are covered with the covering sheets 36A and 36B, the touch is improved.

  And, as shown in FIG. 1, both side portions 3a, 3a along the Y direction of the ventral sheet member 3A and both side portions 3b, 3b along the Y direction of the back side sheet member 3B are joined. A pair of side seal portions 4, 4 is formed on the diaper 1A. For this bonding, for example, a known bonding method such as heat sealing, high frequency sealing, ultrasonic sealing, or adhesive is used. Further, as shown in FIG. 1, the side seal portions 4 and 4 are formed by this bonding, and the waist opening WO and the pair of leg openings LO and LO are formed in the diaper 1 </ b> A.

  As shown in FIG. 4, the ventral sheet member 3 </ b> A and the back sheet member 3 </ b> B in the diaper 1 </ b> A are both an outer layer sheet 31 that forms the outer surface of the diaper, and an inner layer sheet 32 that is disposed on the inner surface side of the outer layer sheet 31. , A plurality of thread-like main body elastic members 33 disposed between the sheets 31 and 32, and the main body elastic member 33 extended in the X direction is provided between the outer layer sheet 31 and the inner layer sheet 32 as Y. A plurality of lines are arranged at intervals in the direction. Specifically, in the ventral sheet member 3A, an adhesive (not shown) is applied between the outer layer sheet 31 and the inner layer sheet 32 at positions corresponding to both side portions 3a and 3a of the ventral sheet member 3A. The both ends of the main body elastic member 33 extended in the X direction are fixed between the outer layer sheet 31 and the inner layer sheet 32. Further, an adhesive (not shown) is applied between the outer layer sheet 31 and the inner layer sheet 32 at positions corresponding to both side portions 2s, 2s on the one end portion 2a side of the absorbent main body 2, and is in an extended state. The main body elastic member 33 is fixed between the outer layer sheet 31 and the inner layer sheet 32. Also in the back side sheet member 3B, as in the case of the abdominal side sheet member 3A, an adhesive (non-adhesive) is provided between the outer layer sheet 31 and the inner layer sheet 32 at positions corresponding to both side portions 3b and 3b of the back side sheet member 3B. The both ends of the main body elastic member 33 extended in the X direction are fixed between the outer layer sheet 31 and the inner layer sheet 32. In addition, an adhesive (not shown) is applied between the outer layer sheet 31 and the inner layer sheet 32 at positions corresponding to both side portions 2s, 2s on the other end 2b side of the absorbent main body 2, and stretched. The main body elastic member 33 in a state is fixed between the outer layer sheet 31 and the inner layer sheet 32.

  The stretched main body elastic member 33 is not fixed to any of the outer layer sheet 31 and the inner layer sheet 32 in a portion other than the adhesive described above. Further, as shown in FIG. 4, the outer layer sheet 31 and the inner layer sheet 32 are joined by a large number of joining portions 34 arranged at intervals between the main body elastic members 33 arranged at intervals in the Y direction. Has been. For this joining, for example, a known joining method such as heat sealing, high frequency sealing, ultrasonic sealing or the like is used. In the diaper 1 </ b> A, a plurality of joint rows of joint portions 34 that are intermittently arranged in series in the Y direction of the diaper 1 are formed in the X direction of the diaper 1. Since the outer layer sheet 31 and the inner layer sheet 32 are thus formed, the softness is improved and the touch and the like are improved. Further, in the diaper 1A, the plurality of thread-like main body elastic members 33 located in the region overlapping with the absorbent main body 2 are each divided into a plurality of pieces, and the main body elastic member 33 finely divided is no longer necessary. It is in a state having almost no contractile force, and a weakly functionalized region is formed in a region overlapping the absorbent main body 2.

  The outer layer sheet 31 and the inner layer sheet 32 may be formed by folding a single sheet member, for example, on the inner surface side (P side in FIG. 4) along the periphery of the waist opening WO. The diaper 1 </ b> A is formed of two separate and independent sheet members.

  As shown in FIGS. 2 and 4, one of the ventral sheet member 3 </ b> A and the dorsal sheet member 3 </ b> B formed as described above has a main body elasticity located at the lowest position among the plurality of main body elastic members 33. An extending portion 35 extending downward from the member 33d is formed. In the diaper 1 </ b> A, extending portions 35 </ b> A and 35 </ b> B are formed in the ventral sheet member 3 </ b> A and the back sheet member 3 </ b> B, respectively. As shown in FIG. 2, in the diaper 1 </ b> A, the extension length (length in the Y direction) of the extension part 35 </ b> A on the abdominal sheet member 3 </ b> A side and the extension part on the back side sheet member side The length (the length in the Y direction) is the same. The extending portions 35A and 35B are portions where the main body elastic member 33 is not disposed, and are disposed over the entire length in the X direction of the ventral sheet member 3A or the back sheet member 3B.

  The extension part 35T of the diaper 1A has an extension tip portion 35T formed from one sheet member of the outer layer sheet 31 and the inner layer sheet 31. Specifically, in the diaper 1A, the extending portion 35B on the back side sheet member 3B side is, as shown in FIG. 4, the extending tip portion 35BT is an outer layer sheet in the outer layer sheet 31 and the inner layer sheet 31. It is formed from one of 31 pieces. In other words, the length of the outer layer sheet 31 in the Y direction is longer than the length of the inner layer sheet 31 in the Y direction, and the outer sheet 31 and the inner layer sheet 31 are overlapped to form the back sheet member 3A. . Therefore, the extending portion 35 </ b> B on the back side sheet member 3 </ b> B side is formed by two portions of the outer layer sheet 31 and the inner layer sheet 31 and one portion of the outer layer sheet 31. The extending portion 35A on the ventral sheet member 3A side is the same as the extending portion 35B on the back seat member 3B side.

  The ratio of the length L2 in the Y direction of the extending portion 35B to the length L1 in the Y direction of the back seat member 3B (L2 / L1) (see FIG. 2) is 1 from the viewpoint of physical stimulus reduction and appearance rendering. % Or more, preferably 5% or more, more preferably 25% or less, further preferably 20% or less, specifically preferably 1% or more and 25% or less, preferably 5% or more and 20% or less. More preferably. Specifically, the length L2 of the extending portion 35B in the Y direction is preferably 1 mm or more, more preferably 5 mm or more, more preferably 25 mm or less, and even more preferably 20 mm or less, from the same viewpoint as the ratio described above. Specifically, it is preferably 1 mm or more and 25 mm or less, and more preferably 5 mm or more and 20 mm or less. The ventral seat member 3A is the same as the back seat member 3B.

The constituent material of the diaper 1A will be described.
As the top sheet 21, the back sheet 22, and the absorber 23 constituting the absorbent main body 2, those conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, as the surface sheet 21, a hydrophilic and liquid-permeable nonwoven fabric, a three-dimensional aperture film, or the like can be used. As the back sheet 22, the leak-proof sheet 22a is a liquid-impermeable or liquid-impervious resin film (including water repellency), and the outer layer nonwoven fabric 22b is a nonwoven fabric produced by various manufacturing methods (for example, an air-through nonwoven fabric or a spunbond nonwoven fabric). , Spunlace nonwoven fabric, needle punched nonwoven fabric, etc.). The outer layer nonwoven fabric 22b may have a multilayer structure. Moreover, as the absorbent body 23, an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held by the absorbent core 23 is made of water-permeable thin paper or non-woven fabric. Those coated with a core wrap sheet can be used. As the hydrophobic sheet member that forms the side sheet 24 serving as a three-dimensional gather and a leg gather, a film, a nonwoven fabric, a woven fabric, or a laminate sheet thereof can be used.

  As the outer layer sheet 31 and the inner layer sheet 32 constituting the abdominal sheet member 3A and the back sheet member 3B, those conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. Non-woven fabrics can be used. Among the non-woven fabrics, from the viewpoint of flexibility and the like, a single-layer nonwoven fabric or a laminated nonwoven fabric of two or more layers comprising an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, etc. Can be used. Moreover, the sheet | seat member which integrated these nonwoven fabrics and films can also be used.

As the main body elastic member 33, the elastic member 25 for forming three-dimensional gathers, and the part elastic member 26 for forming leg gathers, those conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. A thread-like or string-like elastic member made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.
As the adhesive for fixing the elastic members 25 and 26, those conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, a hot-melt adhesive can be used.

The main body elastic member 33d located at the lowermost of the plurality of main body elastic members 33 disposed on the abdominal sheet member 3A or the back sheet member 3B has a stretching stress that suppresses a shift in the wearing position. From the viewpoint of not impairing the mobility of the surroundings, it is larger than the extension stress of each of the elastic members 26 for forming a plurality of leg gathers. Further, the elastic body member 33d has an elongation stress that is greater than the elongation stress of each of the elastic members 25 for forming a three-dimensional gather from the viewpoint of suppressing the shift of the wearing position and not impairing the mobility of the suspension. . Specifically, the elastic members 26 for forming leg gathers, the elastic members 25 for forming three-dimensional gathers, and the main body elastic members 33 are made of the same material and have the same thickness. The elongation stress is made different. The material of the elastic member 26 for forming leg gathers, the elastic member 25 for forming three-dimensional gathers, and the main body elastic member 33 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. it can. In the diaper 1A, the extension rate of the main body elastic member 33d is higher than the extension rate of the elastic member 26 for leg gather formation, and the extension stress of the main body elastic member 33d is the extension stress of the elastic member 26 for leg gather formation. The ratio (the former / the latter) is preferably 1.1 times to 4 times, more preferably 1.2 times to 3 times. In the diaper 1A, the extension rate of the main body elastic member 33d is higher than the extension rate of the elastic member 25 for forming a three-dimensional gather, and the extension stress of the main body elastic member 33d is the elastic member 25 for forming a three-dimensional gather. The ratio to the elongation stress (the former / the latter) is preferably 1.1 to 4 times, and more preferably 1.2 to 3 times. The elongation rate is the ratio of the length of the stretched portion to the natural length. For example, when a 10 cm length is stretched to 20 cm, the stretch rate is 100%.
Further, the plurality of main body elastic members 33 excluding the lowermost main body elastic member 33d is for leg gather formation from the viewpoint that the elongation stress does not impair the mobility of the suspension while suppressing the shift of the wearing position. It is preferable that it is larger than the elongation stress of the elastic member 26 and larger than the elongation stress of the elastic member 25 for forming a three-dimensional gather.

The effect at the time of using the diaper 1A of 1st Embodiment of this invention mentioned above is demonstrated.
As shown in FIG. 3, when the diaper 1 </ b> A is worn, a three-dimensional gather TG and a leg gather LG are formed by the contraction force of the elastic members 25 and 26. And in the X direction inner side of the side sheet 24 used as the three-dimensional gather TG, the three-dimensional gather side non-joining area | region 28T is formed in the part near the fixing | fixed part 27, ie, the root part of the three-dimensional gather TG. In the three-dimensional gather side non-joining region 28T, an air layer is easily formed between the folded hydrophobic sheet members, the air permeability and flexibility of the three-dimensional gather TG are improved, and two sheets are equivalent. Since the hydrophobicity of the sheet member can be sufficiently exerted, the leak-proof property is improved. Further, on the outer side in the X direction of the side sheet 24 serving as the leg gather LG, a leg gather side non-joining region 28L is formed at a distance S from the folded top portion 24T2. And as shown in FIG. 3, this leg gather side non-joining area | region 28L is located in the outermost side in the width direction (X direction) of the absorptive main body 2, and is most easy to contact | abut to a wearer's skin. . In the leg gather side non-joining region 28L, an air layer is easily formed between the folded hydrophobic sheet members, so that it is difficult for the wearer to feel uncomfortable. It is gentle on the skin and improves flexibility.

  Further, in the diaper 1A, as shown in FIG. 3, a region 25T in which the fixing portion 27 and the elastic member 25 for forming the three-dimensional gather are disposed and fixed on the inner side in the X direction of the side sheet 24 serving as the three-dimensional gather TG. The space between the two is a three-dimensional gather side non-joining region 28T. Therefore, even if there are a large amount of body fluids such as urine and menstrual blood, leakage prevention is improved and side leakage can be prevented.

  In the diaper 1 </ b> A, as shown in FIG. 3, the side portion 22 as of the leak-proof sheet 22 a of the back sheet 22 extends beyond the fixing portion 27 outward in the X direction to form a side sheet 24. The outer end portion 24O of the sheet member to be disposed is disposed between the leakproof sheet 22a of the back sheet 22 and the outer nonwoven fabric 22b. Therefore, it is possible to prevent body fluids such as urine and menstrual blood from spreading beyond the fixing portion 27, and leakage prevention is improved.

  Moreover, in diaper 1A, as shown in FIG. 1, the leg gather side non-joining area | region 28L located in the outermost side in the width direction (X direction) of the absorptive main body 2 and the extension of the abdominal sheet member 3A are shown in FIG. The wearer's legs are surrounded by the protruding portion 35A and the extending portion 35B of the back sheet member 3B. Therefore, even if a wearer spreads a leg, it is hard to bite around a leg and wearability improves.

  In addition, in the diaper 1A, as shown in FIG. 4, the extending tip portion 35T of the extending portion 35 (the extending portion 35A of the abdominal sheet member 3A and the extending portion 35B of the back side sheet member 3B) is an outer layer. It is formed from one sheet member of the sheet 31 and the inner layer sheet 31. Therefore, the touch is good and the wearability is improved.

Next, a pants-type disposable diaper 1B (hereinafter also referred to as “diaper 1B”) according to a second embodiment of the present invention will be described with reference to FIG.
About the diaper 1B of 2nd Embodiment, a different point from the diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of the diaper 1A, and description of the diaper 1A is applied suitably.

  In the absorbent main body 2 of the diaper 1 </ b> B, as shown in FIG. 5, the three-dimensional gather side non-joining region 28 </ b> T and the three-dimensional gather formation are formed on the inner side in the width direction (X direction) than the fixing portion 27 in the side seat 24. Between the region 25T where the elastic member is disposed and fixed, a fixed region 29T where the folded sheet member is fixed is formed. That is, as shown in FIG. 5, a three-dimensional gather side non-joining region 28 </ b> T is formed on the inner side of the side sheet 24 in the width direction (X direction) near the fixing portion 27 (closer to the center line CL). A region 25T in which an elastic member for forming a three-dimensional gather is disposed and fixed is formed at the tip of the top portion 24T1, and a fixed region 29T is formed between the three-dimensional gather-side non-joined region 28T and the region 25T. The fixed region 29T is formed over the entire length of the side seat 24 in the Y direction.

  The fixed region 29T is formed by joining the folded sheet members by a plurality of fusion portions (not shown) that are intermittently arranged in the form of dots. In addition, between the sheet | seat members between adjacent fusion | melting parts (not shown) is not joined, but it is easy to form an air layer.

  In the diaper 1B, the ratio (W3 / W1) (see FIG. 5) of the width W3 of the three-dimensional gather side non-joined region 28T to the length W1 in the width direction (X direction) of the side sheet 24 that is folded back is prevented. From the viewpoint of ensuring leakiness, it is preferably 1% or more, more preferably 5% or more, preferably 16% or less, more preferably 11% or less, specifically preferably 1% or more and 16% or less, More preferably, it is 5% or more and 11% or less. Specifically, the width W3 of the three-dimensional gather side non-joining region 28T is preferably 1 mm or more, more preferably 3 mm or more, further preferably 10 mm or less, and further preferably 7 mm or less, from the same viewpoint as the above-described ratio. Is preferably 1 mm or more and 10 mm or less, and more preferably 3 mm or more and 7 mm or less.

  Further, the ratio (W7 / W1) of the width W7 of the fixed region 29T to the length W1 in the width direction (X direction) of the side sheet 24 that is folded back (W7 / W1) (see FIG. 5) Therefore, 5% or more is preferable, 10% or more is more preferable, 50% or less is preferable, 40% or less is more preferable, specifically 5% or more and 50% or less is preferable, and 10% or more and 40% is preferable. More preferably, it is as follows. Specifically, the width W7 of the fixed region 29T is preferably 3 mm or more, more preferably 5 mm or more, more preferably 30 mm or less, still more preferably 25 mm or less, specifically 3 mm or more, from the same viewpoint as the ratio described above. It is preferably 30 mm or less, and more preferably 5 mm or more and 25 mm or less.

The fusion part (not shown) is not particularly limited with respect to its shape, and may be any shape such as a circle, an ellipse, a rhombus, a triangle, and a polygon. The seal pattern area of one fusion part (not shown) is preferably 0.1 mm ² or more, more preferably 0.2 mm ² or more, from the viewpoint of not impairing the wearing feeling. it is also preferably 2 mm ² or less, further preferably 1 mm ² or less, is preferably, 0.2 mm ² or more 1 mm ² or less can more particularly a 0.1 mm ² or more 2 mm ² or less More preferably. In addition, the number of arranged fusion parts (not shown) is preferably 1 / cm ² or more, and more preferably 4 / cm ² or more from the viewpoint of not impairing the wearing feeling. It is preferably 14 pieces / cm ² or less, more preferably 10 pieces / cm ² or less, and more specifically 1 piece / cm ² or more and 14 pieces / cm ² or less. The number is preferably 4 / cm ² or more and 10 / cm ² or less.

  The fused part (not shown) can be formed using, for example, heat sealing, ultrasonic sealing, high frequency sealing, or a combination of two or more thereof. As described above, the formation pattern of the fusion part (not shown) of the diaper 1B is a dot pattern arranged in a dotted pattern, but is not limited thereto. For example, a linear fusion part is provided. It may be a linear pattern or a lattice pattern formed in the Y direction or the like. Two or more seal patterns may be used in combination.

The effect at the time of using the diaper 1B of 2nd Embodiment of this invention mentioned above is demonstrated.
About the effect of the diaper 1B of 2nd Embodiment, a different point from the effect of the diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of the effect of diaper 1A, and description of the effect of diaper 1A is applied suitably.

  In the diaper 1B, as shown in FIG. 5, the three-dimensional gather side non-joining region 28T and the three-dimensional gather forming elastic member are disposed and fixed on the inner side in the width direction (X direction) than the fixing portion 27 in the side seat 24. Between the formed region 25T, a fixed region 29T fixed between the sheet members is formed. Therefore, there is an effect that the rigidity of the three-dimensional gather is increased and the followability to the body is increased.

  In addition, in the plurality of fusion portions (not shown) forming the fixed region 29T, the sheet members between adjacent fusion portions (not shown) are not joined, and an air layer is easily formed. Yes. Therefore, even if a fusion part (not shown) is provided, the breathability and flexibility of the three-dimensional gather TG are hardly impaired, and body fluid does not easily pass through, and the leak-proof property is not easily impaired.

  The disposable diaper of this invention is not restrict | limited to the diaper 1A of the above-mentioned 1st Embodiment, and the diaper 1B of the above-mentioned 2nd Embodiment at all, It can change suitably. Moreover, each component in the diaper 1A-1B of the above-mentioned 1st-2nd embodiment can be implemented suitably combining in the range which does not impair the meaning of this invention.

  For example, in the above-described diapers 1A and 1B, as shown in FIGS. 3 and 5, the outer end portion 24O of the sheet member forming the side seat 24 extends beyond the position of the fixing portion 27 inward in the X direction. It extends and is arranged between the leak-proof sheet 22a of the back sheet 22 and the outer nonwoven fabric 22b, but is not limited to such a position. That is, if the leg gather side non-joining region 28L is arranged so as to be located on the outermost side in the width direction (X direction) of the absorbent main body 2, for example, the outer end of the sheet member forming the side seat 24 The part 24O may be folded back to the position of the fixing part 27, and may be fixed on the inner surface (P side in FIG. 3) of the side part 21s of the topsheet 21.

  Moreover, in the above-mentioned diaper 1A, 1B, as shown in FIG.1 and FIG.2, the extension part 35A, 35B is formed in 3A of abdominal sheet members, and the back | dorsal sheet member 3B, respectively. The extension part 35 should just be formed in one side. Moreover, even if the extension part 35A of the abdominal sheet member 3A and the extension part 35B of the back side sheet member 3B are formed, the extension lengths may be different.

  The disposable diaper of the present invention is a pants-type disposable in which the outer layer body is not divided other than the pants-type disposable diaper in which the outer layer body is divided into the ventral sheet member 3A and the back sheet member 3B, such as diapers 1A and 1B. A diaper may be sufficient and the disposable diaper which has a deployment type fastening tape may be sufficient.

  The following disposable diaper is further disclosed regarding the embodiment mentioned above.

<1>
The elastic member contracts on both sides along the longitudinal direction of the absorbent main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining longitudinal absorbent body interposed between the two sheets. A disposable diaper in which solid gathers and leg gathers are formed by force,
The three-dimensional gathers and the leg gathers are formed from hydrophobic side sheets that are disposed and fixed via fixing parts extending in the longitudinal direction on both side parts along the longitudinal direction of the top sheet of the absorbent main body. And
The side sheet is composed of a single sheet member, and on the inner side in the width direction of the sheet member, the inner end portion is folded back to the outer surface side of the sheet member up to the position of the fixing portion. A plurality of elastic members for forming three-dimensional gathers extending in the longitudinal direction are disposed and fixed in the vicinity of the tops of the folded sheet members, and on the outer side in the width direction of the sheet members, The end portions are folded back to the outer surface side of the sheet member up to the position of the fixed portion, and a plurality of strips are stretched in the longitudinal direction near the fixed portion, spaced from the folded top portion between the folded sheet members. The elastic member for leg gather formation is arranged and fixed,
On the inner side in the width direction than the fixed portion in the side seat, a solid gather-side non-joining region in which no elastic member is arranged and the sheet members are not fixed is formed near the fixed portion. Further, on the outer side in the width direction than the fixed portion of the side seat, there is a leg gather side non-joined region in which no elastic member is arranged at a distance from the top of the folded back and the sheet member is not fixed. Formed,
The said leg gather side non-joining area | region of the said side seat | sheet is a disposable diaper located in the outermost side in the width direction of the said absorptive main body.

<2>
The disposable body according to <1>, wherein the three-dimensional gather side non-joining region extends between the fixing portion of the side sheet and a region where the elastic member for forming the three-dimensional gather is disposed and fixed. Diapers.
<3>
The sheet member folded back between the solid gather side non-joining region and the region where the solid member for forming the solid gather is disposed and fixed on the inner side in the width direction than the fixed portion of the side sheet. The disposable diaper according to the above <1>, wherein a fixed region in which the space is fixed is formed.
<4>
The disposable diaper according to <3>, wherein the fixed region is formed by joining the folded sheet members by a plurality of fusion portions that are intermittently arranged in a dotted pattern.
<5>
The disposable diaper according to <4>, wherein the sheet members between the adjacent fused portions are not joined.
<6>
The ratio (W3 / W1) of the width W3 of the three-dimensional gather side non-joining region to the length W1 in the width direction (X direction) of the side sheet formed by folding is preferably 1% or more, and more preferably 5% or more. 16% or less is preferable, 11% or less is more preferable, specifically 1% or more and 16% or less is preferable, and 5% or more and 11% or less is more preferable <3> to < The disposable diaper according to any one of 5>.
<7>
The ratio (W7 / W1) of the width W7 of the fixing region to the length W1 in the width direction (X direction) of the side sheet formed by folding is preferably 5% or more, more preferably 10% or more, and 50 % Or less, more preferably 40% or less, specifically, preferably 5% or more and 50% or less, and more preferably 10% or more and 40% or less. Any of the above <3> to <6> The disposable diaper according to claim 1.
<8>
The disposable diaper according to any one of <4> to <7>, wherein the fused portion has a circular shape, an elliptical shape, a rhombus shape, a triangular shape, a polygonal shape, or the like.
<9>
The seal pattern area of one fused part is preferably 0.1 mm ² or more, more preferably 0.2 mm ² or more, and preferably 2 mm ² or less, and 1 mm ² or less. still more preferably, it is preferable that more particularly a 0.1 mm ² or more 2 mm ² or less, wherein further preferably 0.2 mm ² or more 1 mm ² or less <4> to any <8> The disposable diaper according to claim 1.
<10>
The disposable diaper according to any one of <4> to <9>, wherein the fusion part is formed using heat sealing, ultrasonic sealing, high frequency sealing, or a combination of two or more thereof.

<11>
The back sheet has a liquid-impervious leak-proof sheet and an outer non-woven fabric narrower than the leak-proof sheet fixed to the outer surface side of the leak-proof sheet,
The outer layer nonwoven fabric has both side portions along the longitudinal direction extending to the position of the elastic member closest to the fixed portion among the plurality of leg gathering elastic members,
The side sheet is formed such that the outer end portion of the one sheet member extends beyond the position of the fixing portion, and is arranged between the leak-proof sheet and the outer layer nonwoven fabric. The disposable diaper according to any one of <1> to <10>.
<12>
The disposable diaper includes the absorptive main body, and an abdominal sheet member disposed on the abdomen side of the wearer that spans and fixes both ends in the longitudinal direction of the absorptive main body, and a dorsal sheet disposed on the back side. And a pair of side seal portions, a waist opening portion and a pair of leg openings are formed by joining both side portions of the ventral seat member along the longitudinal direction of the diaper and both side portions of the back seat member. Pants-type disposable diapers
The abdominal sheet member and the back sheet member are formed of a main body elastic member extending in the diaper width direction between an outer layer sheet forming an outer surface of the diaper and an inner layer sheet disposed on the inner surface side of the outer layer sheet. It is formed by arranging multiple diapers at intervals in the vertical direction,
One of the abdominal seat member and the back seat member is formed with an extending portion that extends downward from a lowermost body elastic member among the plurality of body elastic members. The disposable diaper according to any one of <1> to <11>.
<13>
Each of the abdominal seat member and the back seat member is formed with the extension portion, and the extension length of the extension portion on the abdominal seat member side and the extension on the back seat member side The disposable diaper according to <12>, wherein the extension length of the part is the same.
<14>
The extended diaper is the disposable diaper according to <12> or <13>, wherein an extended tip portion is formed from one sheet member of the outer layer sheet and the inner layer sheet.
<15>
The main body elastic member positioned at the lowermost of the plurality of main body elastic members arranged on the abdominal side sheet member or the back side sheet member has an extension stress of elasticity for forming the plurality of leg gathers. The disposable diaper according to any one of the above <12> to <14>, which is larger than the elongation stress of each member.
<16>
The disposable diaper according to any one of <12> to <15>, wherein the main body elastic member has an extension stress larger than the extension stress of each of the plurality of elastic members for forming a three-dimensional gather.
<17>
The disposable diaper according to any one of <12> to <16>, wherein the elongation rate of the main body elastic member is higher than the elongation rate of the leg gathering elastic member.
<18>
The elongation stress of the main body elastic member is preferably 1.1 times or more and 4 times or less, and the ratio (the former / the latter) of the elastic member for forming the leg gathers is 1.1 times or more and 4 times or less. The disposable diaper according to any one of the above items <12> to <17>, which is more preferably as follows.
<19>
The disposable diaper according to any one of <12> to <18>, wherein the extension rate of the main body elastic member is higher than the extension rate of the elastic member for forming a three-dimensional gather.
<20>
The elongation stress of the main body elastic member is preferably such that the ratio (the former / the latter) to the elongation stress of the elastic member for forming the three-dimensional gather is 1.1 to 4 times, 1.2 to 3 times The disposable diaper according to any one of the above items <12> to <19>, which is more preferably as follows.
<21>
The plurality of main body elastic members excluding the lowermost main body elastic member have an extension stress larger than that of the leg gathering elastic member, and the three-dimensional gather forming elastic member is extended. The disposable diaper according to any one of <12> to <20>, which is larger than stress.

<22>
The side sheet is arranged over the entire length of the absorbent main body via the fixing portion on the inner surface of the top sheet extending outward in the width direction from both side edges along the longitudinal direction of the absorber. The disposable diaper according to any one of the above items <1> to <21>.
<23>
The disposable diaper according to any one of <1> to <22>, wherein the fixing portion is disposed over the entire length of the side sheet and the absorbent main body.
<24>
The ratio (W2 / W1) of the width W2 of the interval S (the leg gather side non-joining region) to the length W1 in the width direction of the side sheet formed by folding is preferably 5% or more, and more preferably 8% or more. Preferably, it is preferably 40% or less, more preferably 30% or less, specifically preferably 5% or more and 40% or less, and more preferably 8% or more and 30% or less. <1> to < The disposable diaper according to any one of 23>.
<25>
The width W2 of the interval S (the leg gather side non-bonding region) is preferably 3 mm or more, more preferably 5 mm or more, preferably 25 mm or less, more preferably 20 mm or less, specifically 3 mm or more and 25 mm or less, preferably 5 mm. The disposable diaper according to any one of <1> to <24>, more preferably 20 mm or less.
<26>
The width W2 of the interval S (the leg gather side non-joining region) is any of the above <1> to <25>, which is wider than the width W4 of the region where the plurality of leg gather forming elastic members are disposed and fixed The disposable diaper according to claim 1.
<27>
The ratio (W4 / W2) of the width W4 to the width W2 of the interval S (the leg gather side non-bonding region) is preferably 10% or more, more preferably 20% or more, and preferably 90% or less, 75% The disposable diaper according to the above <26>, wherein the following is more preferable, specifically 10% or more and 90% or less, and further preferably 20% or more and 75% or less.
<28>
A width W2 of the interval S (the leg gather side non-joining region) is an outer width direction outside of the region where the outer ends in the width direction of the fixing portion and the plurality of elastic members for forming the leg gathers are disposed and fixed. The disposable diaper according to any one of <1> to <27>, which is preferably wider than the interval W5 between the two ends.
<29>
The ratio (W5 / W2) of the interval W5 to the width W2 of the interval S (the leg gather side non-bonded region) is preferably 100% or more, more preferably 200% or more, and more preferably 500% or less, 400% The disposable diaper according to <28>, wherein the following is more preferable, specifically 100% or more and 500% or less, and more preferably 200% or more and 400% or less.

<30>
A width W2 of the interval S (the leg gather side non-joining region) is an inner width in the region where the outer end in the width direction of the fixing portion and the plurality of leg gathering elastic members are disposed and fixed. The disposable diaper according to any one of the above items <1> to <29>, which is preferably wider than the interval W6 between the two ends.
<31>
The ratio (W6 / W2) of the interval W6 to the width W2 of the interval S (the leg gather side non-joining region) is preferably 25% or more, more preferably 50% or more, and preferably 99% or less, 90% or less. Is more preferably 25% or more and 99% or less, and more preferably 50% or more and 90% or less.
<32>
The ratio (W3 / W1) of the width W3 of the three-dimensional gather side non-joining region to the length W1 in the width direction of the side sheet formed by folding is preferably 15% or more, more preferably 25% or more, and 50 % Or less, more preferably 45% or less, specifically preferably 15% or more and 50% or less, and more preferably 25% or more and 45% or less. Specifically, the width W3 of the three-dimensional gather side non-joining region 28T is preferably 10 mm or more, more preferably 15 mm or more, preferably 35 mm or less, more preferably 30 mm or less, specifically 10 mm or more and 35 mm or less, The disposable diaper according to the above <1> or <2>, which is 15 mm or more and 30 mm or less.
<33>
The ratio (L2 / L1) of the length L2 in the longitudinal direction of the extending portion to the length L1 in the longitudinal direction of the front-side sheet member is preferably 1% or more, more preferably 5% or more, and 25% or less. Preferably, it is 20% or less, more preferably 1% or more and 25% or less, and further preferably 5% or more and 20% or less. Any one of the above items <12> to <32> Disposable diapers described in 1.
<34>
The disposable diaper according to any one of <1> to <33>, wherein a side portion of the leak-proof sheet of the back sheet extends beyond the fixed portion outward in the width direction.
<35>
The disposable diaper according to any one of <1> to <34>, wherein the disposable diaper is a pants-type disposable diaper in which an outer layer body is not divided.
<36>
The disposable diaper according to any one of <1> to <34>, wherein the disposable diaper is a disposable diaper having a deployment type fastening tape.

1A, 1B Pant-type disposable diaper 2 Absorbent body 2a, 2b End portion of absorbent body in the longitudinal direction 2s Absorbent body side 21 Surface sheet 21s Surface sheet side 22 Back sheet 22a Leak-proof sheet 22as Leak-proof sheet Side part 22b Outer layer nonwoven fabric 23 Absorber 24 Side sheet 24O Outer end part 24I Inner end part 24T1, 24T2 Folding top part 25 Elastic member for forming three-dimensional gathers 25T Multiple elastic members 25 for forming three-dimensional gathers are arranged Area 26 Leg elastic member for forming leg gathers 26T Area in which multiple elastic members 26 for forming leg gathers are arranged 26s Elastic member for forming leg gathers closest to the fixing part 27 Fixing part 28T Solid gather side non-joint Area 28L Leg gather side non-joining area 29T Fixed area 3A Ventral seat Material 3a Side part of the abdominal sheet member 3B Back sheet member 3b Side part of the back sheet member 31 Outer layer sheet 32 Inner layer sheet 33 Main body elastic member 33d Main body elastic member 35 (35A located at the bottom of the main body elastic member 35B) Extension part 35T Extension tip part of extension part 36A, 36B Cover sheet 4 Side seal part 51 Outer layer adhesive layer 52 Inner layer adhesive layer

Claims (8)

The elastic member contracts on both sides along the longitudinal direction of the absorbent main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining longitudinal absorbent body interposed between the two sheets. A disposable diaper in which solid gathers and leg gathers are formed by force,
The three-dimensional gathers and the leg gathers are formed from hydrophobic side sheets that are disposed and fixed via fixing parts extending in the longitudinal direction on both side parts along the longitudinal direction of the top sheet of the absorbent main body. And
The side sheet is composed of a single sheet member, and on the inner side in the width direction of the sheet member, the inner end portion is folded back to the outer surface side of the sheet member up to the position of the fixing portion. A plurality of elastic members for forming three-dimensional gathers extending in the longitudinal direction are disposed and fixed in the vicinity of the tops of the folded sheet members, and on the outer side in the width direction of the sheet members, The end portions are folded back to the outer surface side of the sheet member up to the position of the fixed portion, and a plurality of strips are stretched in the longitudinal direction near the fixed portion, spaced from the folded top portion between the folded sheet members. The elastic member for leg gather formation is arranged and fixed,
On the inner side in the width direction than the fixed portion in the side seat, a solid gather-side non-joining region in which no elastic member is arranged and the sheet members are not fixed is formed near the fixed portion. Further, on the outer side in the width direction than the fixed portion of the side seat, there is a leg gather side non-joined region in which no elastic member is arranged at a distance from the top of the folded back and the sheet member is not fixed. Formed,
The said leg gather side non-joining area | region of the said side seat | sheet is a disposable diaper located in the outermost side in the width direction of the said absorptive main body.   The disposable body according to claim 1, wherein the three-dimensional gather side non-joining region extends between the fixing portion of the side sheet and a region where the elastic member for forming the three-dimensional gather is disposed and fixed. Diapers.   The sheet member folded back between the solid gather side non-joining region and the region where the solid member for forming the solid gather is disposed and fixed on the inner side in the width direction than the fixed portion of the side sheet. The disposable diaper of Claim 1 in which the fixed area | region where the space | interval was fixed was formed. The back sheet has a liquid-impervious leak-proof sheet and an outer non-woven fabric narrower than the leak-proof sheet fixed to the outer surface side of the leak-proof sheet,
The outer layer nonwoven fabric has both side portions along the longitudinal direction extending to the position of the elastic member closest to the fixed portion among the plurality of leg gathering elastic members,
The side sheet is formed such that the outer end portion of the one sheet member extends beyond the position of the fixing portion and is disposed between the leak-proof sheet and the outer layer nonwoven fabric. The disposable diaper of any one of claim | item 1-3. The disposable diaper includes the absorptive main body, and an abdominal sheet member disposed on the abdomen side of the wearer that spans and fixes both ends in the longitudinal direction of the absorptive main body, and a dorsal sheet disposed on the back side. And a pair of side seal portions, a waist opening portion and a pair of leg openings are formed by joining both side portions of the ventral seat member along the longitudinal direction of the diaper and both side portions of the back seat member. Pants-type disposable diapers
The abdominal sheet member and the back sheet member are formed of a main body elastic member extending in the diaper width direction between an outer layer sheet forming an outer surface of the diaper and an inner layer sheet disposed on the inner surface side of the outer layer sheet. It is formed by arranging multiple diapers at intervals in the vertical direction,
One of the ventral seat member and the dorsal seat member is formed with an extending portion extending downward from a lowermost body elastic member among the plurality of main body elastic members. The disposable diaper of any one of claim | item 1-4.   Each of the abdominal seat member and the back seat member is formed with the extension portion, and the extension length of the extension portion on the abdominal seat member side and the extension on the back seat member side The disposable diaper according to claim 5, wherein the extension length of the part is the same.   The disposable diaper according to claim 5 or 6, wherein the extended tip portion of the extended portion is formed from one sheet member of the outer layer sheet and the inner layer sheet.   The main body elastic member positioned at the lowermost of the plurality of main body elastic members arranged on the abdominal side sheet member or the back side sheet member has an extension stress of elasticity for forming the plurality of leg gathers. The disposable diaper of any one of Claims 5-7 larger than the elongation stress of each member.

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