JP5479865B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to a pants-type absorbent article such as a disposable diaper.

  As a conventional pants-type absorbent article, a pants-type absorbent article having a three-dimensional gather that reduces the gap between the crotch and reduces side leakage is known. For example, in Patent Document 1, as a pants-type absorbent article as described above, elastic members are attached to the side flaps extending outward from both side edges in the width direction of the liquid-absorbent core, and a part of the side flaps is attached. There is described an absorbent pad provided with a three-dimensional gather formed by folding inward and part of the folded back outward.

  In such an absorbent pad described in Patent Document 1, it is easy to make a three-dimensional gather in close contact with the wearer's crotch when worn, and side leakage can be reduced. However, in the absorbent pad described in Patent Document 1, the three-dimensional gather is formed by folding a part of the side flap once inward, so that the three-dimensional gather falls to the inside when worn, and the absorbent pad absorbs liquid. The core urination point is blocked and side leakage cannot be prevented.

  Further, for example, in Patent Document 2, as a pant-type absorbent article as described above, a pair of three-dimensional gathers having a thread-like stretchable elastic member that is stretched along the longitudinal direction is arranged. There is described a disposable diaper that is bonded and fixed to the upper surface of a diaper leaving the tip end region of the three-dimensional gather at the bonded portion at both ends in the longitudinal direction.

  In such a used diaper described in Patent Document 2, the three-dimensional gather is not formed to be folded inward, and the side leakage can be reduced. However, in the disposable diaper described in Patent Document 2, since the tip end region of the three-dimensional gather is not bonded and fixed to the upper surface of the diaper, the tip end region may be bent, which also prevents side leakage. I can't.

Japanese Patent Laid-Open No. 7-11003 Japanese translation of PCT publication No. 2003-180739

  Therefore, the subject of this invention is providing the underpants type absorbent article provided with the three-dimensional gather which can reduce the clearance gap between crotches and can prevent a side leak.

  The present invention includes a ventral sheet disposed on the abdomen side of the wearer at the time of wearing, a dorsal sheet disposed on the dorsal side of the wearer at the time of wearing, and the abdominal sheet and the dorsal sheet via the fixing portion. And a pair of three-dimensional gathers disposed on both sides of the absorbent main body, and both side edges of the ventral seat and the back seat are joined together to form a waist opening. And a pair of leg openings, wherein each of the pair of three-dimensional gathers includes a three-dimensional gather-forming sheet and the three-dimensional gather forming sheet in the expanded and extended state of the pant-type absorbent article. A plurality of elastic members arranged in an elongated state in the longitudinal direction of the gather forming sheet, and the three-dimensional gather forming sheet extends outward in the width direction from the side edge of the absorbent main body, One end in the longitudinal direction is the ventral side The other end is fixed to the back seat, and is formed to stand by contraction of a plurality of the elastic members. Each of the pair of three-dimensional gathers includes the absorbent main body. A first elastic member having the largest expansion and contraction force at a position away from the side edge of the first elastic member in the width direction, and the elasticity other than the first elastic member at a position further away from the first elastic member in the width direction A pants-type absorbent article having a member is provided.

  According to the pants-type absorbent article of the present invention, the gap between the crotch can be reduced and side leakage can be prevented.

FIG. 1 is a perspective view of a pants-type disposable diaper according to the first embodiment of the present invention. FIG. 2 is a plan view of the pants-type disposable diaper shown in FIG. 1 as viewed from the top sheet side in an expanded state. 3A is a cross-sectional view taken along line X1-X1 in FIG. 2, and FIG. 3B is a cross-sectional view taken along line X2-X2 in FIG. 4 is a cross-sectional view showing a state when the pants-type disposable diaper shown in FIG. 1 is attached. FIG. 5: is the top view which looked at the state which extended and expanded the underpants type disposable diaper which is 2nd Embodiment of this invention from the surface sheet side. 6 is a cross-sectional view taken along line X1-X1 of FIG. FIG. 7: is X1-X1 sectional view taken on the line with the underpants type disposable diaper which is 3rd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along line X1-X1 in a state in which a pants-type disposable diaper according to the third embodiment of the present invention is attached.

  Hereinafter, the underpants type absorbent article of the present invention will be described based on the preferred first embodiment with reference to FIGS.

The pants-type disposable diaper 1A of the first embodiment (hereinafter, also referred to as “diaper 1A”) includes an abdominal sheet 2A disposed on the abdomen side of the wearer when worn, and a worn state when worn as shown in FIG. A back sheet 2B disposed on the back side of the person, an absorptive body 3 fixed over the abdomen sheet 2A and the back sheet 2B, and a pair disposed on both side portions 3b and 3b of the absorptive body 3 Three-sided gathers 4, 4, and both side edges 2 a, 2 a of the ventral seat 2 A are joined to both side edges 2 b, 2 b of the back seat 2 B to join the waist opening WO and the pair of leg openings LO , LO are formed.
The diaper 1A is formed symmetrically with respect to the center line CL as shown in FIGS. Accordingly, in the following description, the right side of the symmetrical part will be mainly described.

  The diaper 1A of the first embodiment will be described in detail. The diaper 1A is a longitudinal direction (hereinafter referred to as “Y direction” in the extended state of the diaper 1 (see FIG. 2). Y direction: direction parallel to the center line CL. And abdominal side A disposed on the abdomen of the wearer, a dorsal side B disposed on the dorsal side of the wearer, and abdomen A and dorsal B at the time of wearing. It has a crotch part C which is located between the crotch parts of the wearer. The width direction of the diaper 1A is a direction orthogonal to the longitudinal direction (Y direction) (hereinafter referred to as “X direction”).

  As for the diaper 1A of the first embodiment, as shown in FIG. 2, the ventral sheet 2A is a belly that extends downward along the ventral sheet main body 20A and the lower edge 200 of the ventral sheet main body 20A when worn. A side extending portion 21A is provided. Here, “downward” means a direction toward the center CT (see FIG. 2) of the diaper 1A in the longitudinal direction (Y direction) of the diaper 1A. Specifically, the ventral seat body 20A has a long rectangular shape in the diaper width direction (X direction) in the extended state of the diaper 1 (see FIG. 2), and the left and right sides along the diaper longitudinal direction (Y direction). It has a pair of side edge parts 20a and 20a. The ventral extension portion 21A extends downward from the ventral sheet main body 20A along the lower edge 200 of the ventral sheet main body 20A. In the extended state of the diaper 1 (see FIG. 2), the diaper width direction (X It has a long rectangular shape in the direction), and has a pair of left and right side edges 21a, 21a along the diaper longitudinal direction (Y direction).

  In the present invention, as shown in FIG. 2, the back seat 2B includes a back seat main body 20B and a back extension portion 21B extending downward along the lower edge 200 of the back seat main body 20B when mounted. I have. Here, “downward” means a direction toward the center CT (see FIG. 2) of the diaper 1A in the longitudinal direction (Y direction) of the diaper 1A, like the ventral sheet 2A. Specifically, the back-side seat body 20B has a long rectangular shape in the diaper width direction (X direction) in the extended state of the diaper 1 (see FIG. 2), and the left and right sides along the diaper longitudinal direction (Y direction). It has a pair of side edge parts 20b and 20b. The back-side extending portion 21B extends downward from the back-side seat body 20B along the lower edge 200 of the back-side seat body 20B. In the extended state of the diaper 1 (see FIG. 2), the diaper width direction (X It has a long rectangular shape in the direction) and has a pair of left and right side edges 21b, 21b along the diaper longitudinal direction (Y direction).

  In the diaper 1A of the first embodiment, a pair of both side edges 2a, 2a of the abdominal sheet 2A and a part of both side edges 2b, 2b of the back sheet 2B are joined to form a pair with the waist opening WO. Leg openings LO and LO are formed. Specifically, the side edge portions 20a and 20a of the ventral seat body 20A and the side edge portions 20b and 20b of the back seat body 20B are joined in the entire region, and the side edges 21a and 21a of the ventral extension portion 21A. And the side edge portions 21b and 21b of the back seat main body 20B are not joined. In this way, the side edge portions 20a, 20a of the ventral seat body 20A and the side edge portions 20b, 20b of the back seat body 20B are joined, and the diaper 1A has side seal portions 5, 5 and a waist opening. WO and a pair of leg openings LO, LO are formed. For this joining, for example, a heat seal, a high frequency seal, an ultrasonic seal, an adhesive, or the like is used.

  The length in the longitudinal direction (Y direction) of the side seal portion 5 shown in FIG. 1 is the length L1 in the longitudinal direction (Y direction) of the ventral seat body 20A and the back seat body 20B as shown in FIG. The length is the same as the length La in the longitudinal direction (Y direction) of the ventral sheet 2A and the length Lb in the longitudinal direction (Y direction) of the back side sheet 2B. The ventral seat 2A is formed with a ventral extension portion 21A having a length L2 in the longitudinal direction (Y direction) extending downward from the side seal portion 5, and the back seal 2B has a side seal. A back-side extending portion 21 </ b> B having a length L <b> 3 in the longitudinal direction (Y direction) extending downward from the portion 5 is formed.

  From the viewpoint of sufficiently covering the wearer's buttocks on the back side of the wearer at the time of wearing, the abdomen extending portion 21A and the dorsal extending portion 21B of the diaper 1A have the extension start positions of the diaper 1A. A position corresponding to the groin portion of the wearer at the time of wearing is preferable. Specifically, the length L2 of the ventral side extension portion 21A is preferably 5 to 150% of the length L1 of the side seal portion 5 (belt side seat body 20A), and preferably 25 to 70%. Is more preferable. Furthermore, the length L2 of the ventral side extending portion 21A is preferably 5 to 60% of the length La of the ventral sheet 2A, and more preferably 20 to 40%. The length L3 of the back extension part 21B is preferably 5 to 150% of the length L1 of the side seal part 5 (back side seat body 20B), and more preferably 25 to 70%. Furthermore, the length L3 of the back side extension portion 21B is preferably 5 to 60% of the length Lb of the back side seat 2B, and more preferably 20 to 40%. In addition, it is preferable that extension length L2, L3 of each of the abdominal extension part 21A and the back extension part 21B is 10 mm or more, and it is more preferable that it is 20 mm or more.

  The ventral sheet 2A and the dorsal sheet 2B are extended lengths of the ventral extension part 21A from the viewpoint of reducing the exposed part of the skin that is visible when the wearer is seen from the front side and reducing anxiety about leakage. It is preferable that L2 and the extension length L3 of the back side extension part 21B are substantially equal.

  On the other hand, the abdominal sheet 2A and the back sheet 2B cover the buttocks to prevent excessive exposure, and from the viewpoint of forming a diaper excellent in appearance so as to cover the wearer's crotch front side to some extent. The extension length L3 of the back extension part 21B is preferably longer than the extension length L2 of the ventral extension part 21A.

  As the abdominal sheet 2A and the back sheet 2B, a material that forms a gather by contraction of elastic members arranged in an expanded state between the sheets, or a stretchable nonwoven fabric in which the nonwoven fabric itself is stretchable is used. be able to. In the diaper 1A, as shown in FIGS. 2 and 3, the outer layer sheet 22 forming the outer surface of the diaper, the inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22, and the two sheets 22, 23 in an extended state. A plurality of thread-like elastic members 24 (see FIG. 3B) are provided, and the elasticity of the elastic members 24 is expressed by contraction. In the diaper 1A of the first embodiment, as shown in FIG. 2, the outer layer sheet 22 has a longer longitudinal direction than a region where a plurality of thread-like elastic members 24 are sandwiched and fixed by the outer layer sheet 22 and the inner layer sheet 23 (see FIG. It has a length extending in the (Y direction). The extended region of the outer layer sheet 22 extending from the inner layer sheet 23 is folded back to the absorbent main body 3 side and extends to a position covering the end 3a in the longitudinal direction (Y direction) of the absorbent main body 3, The part which overlaps the longitudinal direction edge part 3a of the absorptive main body 3 is adhere | attached through the adhesive agent (not shown) over the whole area of the width direction (X direction) of the absorptive main body 3. FIG.

  As shown in FIGS. 2 and 3, the absorbent main body 3 has a substantially vertically long rectangular shape, and includes a top sheet 31, a back sheet 32, and an absorber 33 interposed between both sheets 31 and 32. . Specifically, in the diaper 1A, as shown in FIG. 2, the absorbent main body 3 includes a liquid-permeable top sheet 31, a liquid-impermeable (poor liquid-permeable) back sheet 32, and both sheets 31, It has the absorber 33 interposed between 32, and is a rectangular shape long in the longitudinal direction (Y direction) of the diaper 1A. As shown in FIG. 2, the absorbent body 33 has a rectangular shape that is long in the longitudinal direction (Y direction) of the diaper 1 </ b> A, and both the top sheet 31 and the back sheet 32 are each of the diaper 1 </ b> A as shown in FIG. 2. It is a long rectangular shape in the longitudinal direction (Y direction). As shown in FIG. 3A, the top sheet 31 is longer in the width direction (X direction) than the back sheet 32, and a portion extending from the outer edge in the width direction (X direction) of the absorber 33 is formed. In the portion that is folded back to the non-skin contact surface side of the absorbent body 33 and joined to the back sheet 32, and the top sheet 31 and the back sheet 32 extend from both end edges in the longitudinal direction (Y direction) of the absorbent body 33. Are joined together. By joining in this way, the vertically long rectangular absorbent main body 3 is formed.

  As shown in FIGS. 2 and 3, the absorbent main body 3 is provided with a pair of three-dimensional gathers 4 and 4 on both side portions 3 b and 3 b of the absorbent main body 3. Each of the pair of three-dimensional gathers 4 and 4 is arranged in a stretched state in the longitudinal direction (Y direction) of the three-dimensional gather forming sheet 40 and the three-dimensional gather forming sheet 40 in the expanded and expanded state of the pant-type absorbent article. A plurality of elastic members 41. Specifically, as shown in FIG. 3, each of the pair of three-dimensional gathers 4 and 4 is formed of an inner forming sheet 42 disposed on the top sheet 31 side and an outer forming sheet 43 disposed on the back sheet 32 side. And a plurality of elastic members 41 arranged in an elongated state in the longitudinal direction (Y direction) between the inner forming sheet 42 and the outer forming sheet 43. In the first embodiment, the three-dimensional gather forming sheet 40 is a single rectangular sheet that is long in the longitudinal direction (Y direction) of the diaper 1A, at a position that is substantially half in the width direction (X direction). The inner formed sheet 42 and the outer formed sheet 43 are formed by folding back, and are formed of a single rectangular inner formed sheet 42 that is long in the longitudinal direction (Y direction) of the diaper 1A, and the inner formed sheet 42. Alternatively, the diaper 1 </ b> A may be formed of a single rectangular outer forming sheet 43 that is long in the longitudinal direction (Y direction) and has the same shape and size as the inner forming sheet 42.

  As shown in FIGS. 3A and 3B, the three-dimensional gather forming sheet 40 extends outward in the width direction (X direction) from the side edge 3b of the absorbent main body 3, and is shown in FIG. As described above, one end 40a in the longitudinal direction (Y direction) of the three-dimensional gather forming sheet 40 is fixed to the ventral sheet 2A, and the other end 40b is fixed to the dorsal sheet 2B. It is formed so as to stand by contraction. As shown in FIG. 2, one end 40a of the three-dimensional gather forming sheet 40 is fixed to the ventral sheet 2A in the entire area, and the other end 40b of the three-dimensional gather forming sheet 40 is the back side sheet 2B in the entire area. It is fixed to.

  As shown in FIG. 3A, each of the pair of three-dimensional gathers 4 and 4 has a stretching force at a position away from the side edge 3b1 of the absorbent main body 3 in the width direction (X direction) in the crotch part C. The first elastic member 41a having the largest diameter and the elastic member 41 other than the first elastic member 41a at a position further away from the first elastic member 41a in the width direction (X direction). That is, as shown in FIG. 3A, no elastic member 41 other than the first elastic member 41a is disposed inward in the width direction (X direction) from the first elastic member 41a. The elastic force of the elastic member 41 can be increased by increasing its thickness (dtex) or increasing the elongation rate of the elastic member 41 disposed. The elongation rate of the elastic member 41 is a value calculated from ((b−a) / a) × 100, where a is the length in the natural state and b is the length when the elastic member 41 is expanded. is there.

  The elastic force of the first elastic member 41a fits around the foot without any gaps to prevent excrement from leaking, and is extended by 70% from the viewpoint of reducing rubber marks without overtightening the foot circumference. The stress is preferably 5 to 50 cN, more preferably 10 to 40 cN. The elastic force of the elastic member 41 other than the first elastic member 41a is such that the stress in a state where the elastic member 41 is stretched by 70% from the viewpoint of constantly fitting around the outer periphery of the first elastic member 41a is 0. It is preferably 1 to 40 cN, and more preferably 0.1 to 35 cN.

  Each of the plurality of elastic members 41 is preferably arranged at least in the crotch part C as shown in FIG. In the diaper 1A of the first embodiment, the diaper 1A of the ventral sheet 2A is disposed from the ventral sheet main body 20A to the dorsal sheet main body 20B of the dorsal sheet 2B, as shown in FIG. The three-dimensional gather forming sheet 40 is not arranged until reaching one end 40a and the other end 40b. Two to ten elastic members 41 are preferably arranged between the inner forming sheet 42 and the outer forming sheet 43, and three elastic members 41 are arranged in the diaper 1A of the first embodiment. That is, there are one first elastic member 41a and two elastic members 41 other than the first elastic member 41a.

  In the diaper 1A of the first embodiment, each of the pair of three-dimensional gathers 4 and 4 is outward in the width direction (X direction) from the side edge 3b1 of the absorbent main body 3, as shown in FIG. The first elastic member 41a is arranged in the first region E adjacent to the innermost region D, and has four regions D, E, F, G that divide the portion functioning as a three-dimensional gather into four equal parts. The expansion / contraction force of one area E is the largest. Here, the “part that functions as a three-dimensional gather” means a part that substantially rises and forms a leak-proof wall in the crotch part C. The three-dimensional gather forming sheet 40, the top sheet 31, and the back surface It is determined by the positional relationship between the fixing portion 6 to which the sheet 32 is fixed and the side edge portion 3b1 of the absorbent main body 3. That is, the “part that functions as a three-dimensional gather” means that when the side edge 3b1 of the absorbent main body 3 is positioned outward in the width direction (X direction) from the fixed portion 6, as shown in FIG. Means a portion outward in the width direction (X direction) from the side edge 3b1 of the three-dimensional gather 4, and the fixing portion 6 is more than the side edge 3b1 of the absorbent main body 3 as shown in FIG. When located outside in the width direction (X direction), it means a portion outside the width direction (X direction) from the fixed portion 6 in the three-dimensional gather 4.

  Specifically, each of the pair of three-dimensional gathers 4 and 4 of the diaper 1A of the first embodiment is arranged in the width direction (X direction) from the side edge 3b1 of the absorbent main body 3, as shown in FIG. The innermost region D near the center line CL, the first region E adjacent to the innermost region D, and the first region, obtained by dividing the length W1 in the width direction (X direction) of the extending portion into four equal parts A region F adjacent to the outer side of E and an outermost region G are provided. The width W1 of the three-dimensional gather 4 is preferably 20 mm to 80 mm, and more preferably 20 mm to 50 mm. As described above, the first elastic member 41a is disposed in the first region E, and the elastic member 41 is not disposed inward in the width direction (X direction) from the first elastic member 41a. Therefore, no elastic member is disposed in the innermost region D. In the diaper 1A of the first embodiment, the contraction force of each of the four regions D, E, F, G gradually increases from the outermost region G toward the first region E. That is, the contraction force of the first region E is larger than the contraction force of the region F, and the contraction force of the region F is larger than the contraction force of the outermost region G.

The contraction force of the outermost region G is preferably 0 to 40 cN, more preferably 0 to 30 cN, and more preferably 0 to 30 cN from the viewpoint of fitting the three-dimensional gather 4 planarly around the thigh when worn. The shrinkage force is preferably 0.1 to 40 cN, more preferably 0.1 to 35 cN, and the shrinkage force of the first region E is preferably 1 to 50 cN, and preferably 5 to 40 cN. More preferably.
The contractile force of each of the three regions E, F, and G is measured by a Tensilon universal testing machine (RTC-1210A) manufactured by ORIENTEC. The specific measurement method is as follows.

<Measuring method of contraction force in each of the three regions E, F, G>
In the diaper 1A, as shown in FIG. 2, the diaper 1A is unfolded and expanded so as to expand in a flat shape, and the crotch C is outside the side edge 3b1 of the absorbent main body 3 in the width direction (X direction). A portion of the three-dimensional gather 4 extending in the direction is taken out in the longitudinal direction (Y direction) to a size of 330 mm. The portion of the three-dimensional gather 4 that has been taken out is expanded and expanded into a flat shape, and is divided into four equal parts in the width direction (X direction), and the innermost region D, the first region E, the region F, and the outermost region G are separated. The samples of the first region E, the region F, and the outermost region G that are cut out and cut out are used as test samples. Both ends in the longitudinal direction (Y direction) of each cut out region (test sample) are sandwiched between chucks of a Tensilon tensile tester (“RTC-1210A” manufactured by ORIENTEC), and each measurement sample is longitudinally moved at a speed of 300 mm / min. 80 (e.g., 80 mm) equivalent to 80 (e.g., 80 mm) when the length of the test sample is 100 (e.g., 100 mm) measured in a state where the three-dimensional gathering sheet 40 is not contracted by the elastic member 41. Read the tensile load (cN) when extended to length. The measurement is performed three times, and the average value is calculated as the contraction force value of each test sample.

  In order to form the contraction force of the first region E larger than the contraction force of the region F and the contraction force of the region F larger than the contraction force of the outermost region G, from the outermost region G toward the first region E. The thickness (dtex) of the elastic member 41 to be arranged may be increased, the elongation rate of the elastic member 41 to be arranged may be increased, and from the outermost region G to the first region E, The number of elastic members 41 arranged in each region may be increased, the interval between them may be reduced, or a combination thereof may be used.

  As shown in FIGS. 2 and 3A, in the diaper 1A of the first embodiment, the first elastic member 41a is arranged in the first region E, and the elastic members 41 other than the first elastic member 41a are in the region F. And one for each outermost region G. In that case, when the thickness of the elastic member 41 arranged in each region E, F, G is the same, the expansion rate of the first elastic member 41a arranged in the first region E is 50% to 300%. It is preferable that the elastic member 41 disposed in the region F has an elongation rate of 10% to 250%, and the elastic member 41 disposed in the outermost region G has an elongation rate of 5% to 250%. Preferably there is. Moreover, when the expansion | extension rate of the elastic member 41 distribute | arranged to each area | region E, F, G is the same, the thickness of the 1st elastic member 41a distribute | arranged to the 1st area | region E may be 156 dtex-1880 dtex. Preferably, the thickness of the elastic member 41 disposed in the region F is preferably 117 dtex to 1240 dtex, and the thickness of the elastic member 41 disposed in the outermost region G is preferably 78 dtex to 940 dtex. . Note that one elastic member 41 arranged in each of the regions E, F, and G includes a member in which a plurality of elastic members are close to each other and can be regarded as one elastic member.

  In the diaper 1A of the first embodiment, when the first elastic member 41a is arranged in the first region E, it may be in any position within the first region E. Specifically, the first elastic member The arrangement position of 41a may be the X direction outer end of the first region E, the X direction inner end of the first region E, the X direction outer end of the first region E, and the X direction of the first region E. It may be between the inner ends.

  As described above, since the contraction force of the first region E is larger than the contraction force of the region F and the contraction force of the region F is larger than the contraction force of the outermost region G, each region E, F, G In the case where the number of elastic members 41 arranged is increased from the outermost region G toward the first region E and the interval between the adjacent elastic members 41 is narrowed, From the viewpoint of fitting the outermost region F in a planar shape around the legs, instead of only the tip fitting linearly around the legs, the elastic member is provided at the tip (outer end) G1 of the outermost region G. It is preferable that 41 is not arranged.

  In the crotch part C of the diaper 1A of the first embodiment, as shown in FIG. 3A, the absorber 33 is sandwiched between both side portions 33b and 33b of the absorber 33 and both side portions 33b and 33b. Between the center part 33c, it has a pair of space part 33a, 33a in which the absorber 33 (core of an absorber) is not arranged. The space 33 a of the absorbent body 33 in the diaper 1 </ b> B is formed so as to extend in the longitudinal direction (Y direction) of the absorbent body 33 in the crotch part C.

As shown in FIG. 2, the absorbent main body 3 is fixed over the abdominal sheet 2A and the back sheet 2B. Specifically, as shown in FIG. 2, the absorbent main body 3 is disposed so as to intersect the ventral sheet 2A, and is fixed to the ventral sheet main body 20A and the ventral extension portion 21A at the center thereof. The back seat 2B is arranged so as to intersect with the back seat 2B, and is fixed to the back seat main body 20B and the back extension portion 21B at the center. As shown in FIG. 3A, each of the side portions 3b and 3b of the absorbent main body 3 includes a ventral seat body 20A, a ventral extension portion 21A, a back seat portion 20B, and a back extension portion 21B. The three-dimensional gather 4 is formed so as to stand up easily when the diaper is worn by contraction of the elastic member 41 which is not fixed and is stretched in the longitudinal direction (Y direction) when the diaper is worn. . In addition, in the crotch part C of the diaper 1A of the first embodiment, as shown in FIG. 3A, the absorbent body 33 has a pair of space portions 33a and 33a. Due to the contraction of the elastic member 41 arranged in the direction extended in the direction (Y direction), the three-dimensional gather 4 is formed so as to be more easily raised when the diaper is mounted.
In addition, as for the absorptive main body 3, the center part is not being fixed with the ventral seat main body 20A, the ventral extension part 21A, the dorsal seat main body 20B, and the dorsal extension part 21B. Only the end portion 3 a in the longitudinal direction (Y direction) may be bonded between the extended region of the outer layer sheet 22 that extends beyond the inner layer sheet 23 and the inner layer sheet 23.

The forming material of the pants-type disposable diaper 1A of the first embodiment will be described.
The outer layer sheet 22 and the inner layer sheet 23 constituting the abdominal sheet 2A and the back sheet 2B can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the outer layer sheet 22 and the inner layer sheet 23, a water-repellent nonwoven fabric or the like can be used.

  As the surface sheet 31, the back sheet 32, and the absorbent body 33 constituting the absorbent main body 3, as long as they are usually used for absorbent articles such as disposable diapers, they can be used without particular limitation. For example, a hydrophilic and liquid-permeable nonwoven fabric can be used as the top sheet 31, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a nonwoven fabric is used as the back sheet 32. be able to. As the absorbent body 33, an absorbent core made of absorbent polymer particles and a fiber material covered with tissue paper (not shown) can be used.

  As the three-dimensional gather forming sheet 40 that forms the three-dimensional gather 4, any sheet that can be used for absorbent articles such as disposable diapers can be used without particular limitation. For example, as the three-dimensional gather forming sheet 40, a liquid-resistant or water-repellent and breathable stretchable film, nonwoven fabric, woven fabric, or a laminated sheet thereof can be used.

  Examples of the elastic member 24 disposed on the ventral sheet 2A and the back sheet 2B and the elastic member 41 (including the first elastic member 41a) disposed on the three-dimensional gather forming sheet 40 include natural rubber, polyurethane, polystyrene-poly A thread-like stretchable material made of isoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

  As a fixing means between the absorbent main body 3 and the abdominal sheet 2A and the back sheet 2B, the adhesive used for absorbent articles such as disposable diapers, heat embossing, ultrasonic embossing, high frequency embossing, etc. A landing means is used. Similarly, the fixing of the top sheet 31, the back sheet 32, and the three-dimensional gather forming sheet 40 is usually performed by an adhesive used for absorbent articles such as disposable diapers, or by fusing means such as heat embossing, ultrasonic embossing, and high-frequency embossing. Used. For joining the side seal portions 5 and 5, for example, a heat seal, a high frequency seal, an ultrasonic seal, an adhesive, or the like is used.

The effect at the time of using the underpants type disposable diaper 1A of 1st Embodiment of this invention mentioned above is demonstrated.
The diaper 1A of the first embodiment includes, as shown in FIGS. 1 and 2, an abdominal sheet 2A disposed on the abdomen side of the wearer when worn and a back sheet disposed on the back side of the wearer when worn. Since it is a pants-type disposable diaper comprising 2B and the absorbent main body 3 fixed over the central portions of the ventral sheet 2A and the back sheet 2B, it is easy to move the legs. Moreover, as for the diaper 1A of 1st Embodiment, as shown in FIG. 1, FIG. 2, the back side sheet | seat 2B is the back side extension part 21B extended below along the lower edge 200 of the back side sheet | seat main body 20B. Therefore, the wearer's buttocks can be sufficiently covered. Moreover, the diaper 1A of 1st Embodiment is the side of the absorptive main body 3 as shown in Fig.3 (a) and FIG.3 (b), the solid gathers formation sheet 40 in which the solid gather 4 forms it. Extending outward from the edge 3b in the width direction (X direction), as shown in FIG. 2, one end 40a in the longitudinal direction (Y direction) of the three-dimensional gather forming sheet 40 is fixed to the ventral sheet 2A, The other end portion 40 b is fixed to the back seat 2 </ b> B, and is formed to stand up by contraction of the elastic member 41. Therefore, the tip (outer end) G1 of the outermost region G of the three-dimensional gather 4 is not easily bent. Further, in the diaper 1A of the first embodiment, the three-dimensional gather 4 expands and contracts to a position away from the side edge 3b1 of the absorbent main body 3 in the width direction (X direction) as shown in FIG. The first elastic member 41a having the largest force and the elastic member 41 other than the first elastic member 41a are provided at positions further away from the first elastic member 41a in the width direction (X direction). That is, as shown in FIG. 3A, no elastic member 41 other than the first elastic member 41a is disposed inward in the width direction (X direction) from the first elastic member 41a. Therefore, the three-dimensional gather 4 can easily stand, reduce the gap between the crotch, and prevent side leakage.

  In the diaper 1A of the first embodiment, as shown in FIG. 3A, the three-dimensional gather 4 has four regions D, E, F, and G that equally divide the portion that functions as the three-dimensional gather. In addition, the first elastic member 41a is disposed in the first region E, and the first region E is formed so that the expansion / contraction force is maximized. Therefore, the three-dimensional gather 4 is easy to bend toward the wearer side from the first elastic member 41a in the first region E as shown in FIG. 4 when worn, and the first region of the three-dimensional gather 4 around the thigh. Since the region extending from E to the outermost region G can be fitted in a planar manner, the gap between the crotch can be further reduced and side leakage can be prevented.

  Moreover, in the diaper 1A of 1st Embodiment, as shown to Fig.3 (a), each contraction force of three area | regions E, F, G is toward the 1st area | region E from the outermost area | region G, It is getting bigger gradually. Therefore, as shown in FIG. 4, the three-dimensional gather 4 can further fit a region extending from the first region E to the outermost region G of the three-dimensional gather 4 planarly around the thigh when worn. Therefore, the gap between the crotch can be further reduced and side leakage can be further prevented.

Next, the underpants type disposable diaper of 2nd Embodiment of this invention is demonstrated based on FIG. 5, FIG.
About the underpants type disposable diaper 1B of 2nd Embodiment (henceforth "diaper 1B"), a different point from the underpants type disposable diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated in particular is the same as that of the pants-type disposable diaper 1A of the first embodiment, and the description of the pants-type disposable diaper 1A of the first embodiment is applied as appropriate.

  As shown in FIG. 5, the diaper 1 </ b> B of the second embodiment is different from the exterior body of the diaper 1 </ b> A composed of two of the ventral sheet 2 </ b> A and the back sheet 2 </ b> B in that the exterior body is composed of one. Moreover, the diaper 1B of 2nd Embodiment is a point with which two pairs of solid gathers 4a and 4b are distribute | arranged to the both sides 3b and 3b of the absorptive main body 3, respectively, as shown in FIG. It differs from diaper 1A in which only 4 are arranged.

  The diaper 1B has an abdominal side A disposed on the abdomen side of the wearer at the time of wearing and a back side part B disposed on the back side of the wearer at the time of wearing. Each side edge 2a, 2a of the part A and each side edge 2b, 2b of the back side B are joined to form a waist opening WO and a pair of leg openings LO, LO.

  As shown in FIG. 5, the exterior body 2 has a shape in which both side edges are constricted inward in the center portion in the longitudinal direction (Y direction). Further, as shown in FIG. 5, the exterior body 2 includes an outer layer sheet 22 that forms the outer surface of the diaper, an inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22, and a plurality of sheets disposed between the two sheets 22, 23. The outer layer sheet 21 and the inner layer sheet 22 are each composed of a single sheet that extends over the abdomen A, the crotch C, and the dorsal B.

  In the diaper 1B of the second embodiment, as in the diaper 1A of the first embodiment, the outer layer sheet 22 is composed of a plurality of thread-like elastic members 24 by an outer layer sheet 22 and an inner layer sheet 23 as shown in FIG. It has a length that extends further in the longitudinal direction (Y direction) than the region where it is clamped and fixed. The extended region of the outer layer sheet 22 extending from the inner layer sheet 23 is folded back to the absorbent main body 3 side and extends to a position covering the end 3a in the longitudinal direction (Y direction) of the absorbent main body 3, The part which overlaps the longitudinal direction edge part 3a of the absorptive main body 3 is adhere | attached through the adhesive agent (not shown) over the whole area of the width direction (X direction) of the absorptive main body 3. FIG.

  As shown in FIGS. 5 and 6, the absorbent main body 3 has two pairs of three-dimensional gathers (first three-dimensional gather 4 a and second three-dimensional gather 4 b) disposed on both side portions 3 b and 3 b of the absorbent main body 3. Yes. In the diaper 1B of the second embodiment, as shown in FIG. 6, the top sheet 31 is longer in the width direction (X direction) than the back sheet 32, and the outer end of the absorbent body 33 in the width direction (X direction). The part extended from the edge is joined to the back sheet 32, and the top sheet 31 and the back sheet 32 are joined to each other at the part extending from both end edges in the longitudinal direction (Y direction) of the absorber 33. By joining in this way, the vertically long rectangular absorbent main body 3 is formed.

  Each of the first three-dimensional gathers 4a and each of the second three-dimensional gathers 4b is in the longitudinal direction (Y direction) of the three-dimensional gather forming sheet 40 and the three-dimensional gather forming sheet 40 in the expanded and expanded state of the pant-type absorbent article. And a plurality of elastic members 41 arranged in an extended state. Specifically, in the diaper 1B of the second embodiment, as illustrated in FIG. 6, the three-dimensional gather forming sheet 40 is a single sheet, which is a top portion on the free end side of the second three-dimensional gather 4b. The sheet is folded in two along the fold line to form a two-ply sheet, and a plurality of elastic members 41 extending in the longitudinal direction (Y direction) are arranged between the two ply sheets and fixed with an adhesive to form a second solid. A gather 4b is formed. Furthermore, in the diaper 1B of the second embodiment, as shown in FIG. 6, the double-stacked sheet extends outward in the width direction (X direction) and becomes the top on the free end side of the first three-dimensional gather 4a. The sheet is further folded in two along the fold line to form a four-ply sheet, and a plurality of elastic members 41 stretched in the longitudinal direction (Y direction) are formed between the two-ply sheets constituting the four-ply sheet. The first three-dimensional gather 4a is formed by being arranged and fixed by an adhesive. In the diaper 1B of the second embodiment, as shown in FIG. 6, the leading end portion of the two-layered sheet is finally disposed between the top sheet 31 or the absorber 33 and the back sheet 32, and the two-layered sheet is stacked. The sheet is fixed by a fixing portion 6. Each of the second three-dimensional gathers 4b is formed so as to stand toward the wearer's skin side by contraction of the plurality of elastic members 41. The first three-dimensional gather 4a of the diaper 1B of the second embodiment is formed to stand by contraction of the plurality of elastic members 41, like the three-dimensional gather 4 of the diaper 1A of the first embodiment.

  In the diaper 1B of 2nd Embodiment, as shown in FIG. 6, the "part which functions as a solid gather" is the fixing | fixed part 6 to which the sheet | seat 40 for solid gathers formation, the surface sheet 31, and the back surface sheet 32 were fixed. Since it is located outward in the width direction (X direction) from the side edge portion 3b1 of the absorbent main body 3, it is a portion in the width direction (X direction) outward from the fixed portion 6 in the first three-dimensional gather 4a. As shown in FIG. 6, each of the pair of first three-dimensional gathers 4 a and 4 a of the diaper 1 </ b> B of the second embodiment is in the width direction (X direction) of the portion extending in the width direction (X direction) from the fixed portion 6. The innermost region D near the center line CL, the length W1 divided into four equal parts, the first region E adjacent to the innermost region D, the region F adjacent to the outer side of the first region E, And an outermost region G.

  In the diaper 1B of 2nd Embodiment, as shown in FIG. 6, the absorber 33 is equipped with the upper layer absorber 33d narrower than the center part 33c on the center part 33c. The upper layer absorbent body 33d extends at least to the crotch part C. In the diaper 1B, similarly to the diaper 1A, the absorber 33 (absorber core) is disposed between the side portions 33b and 33b of the absorber 33 and the central portion 33c sandwiched between the side portions 33b and 33b. It has a pair of space portions 33a, 33a that are not arranged.

The formation material of the pants-type disposable diaper 1B of 2nd Embodiment is demonstrated.
The elastic member 41 arranged in the first three-dimensional gather 4a and the second three-dimensional gather 4b is the same as the elastic member 41 arranged in the three-dimensional gather 4 of the pant-type disposable diaper 1A of the first embodiment, and the upper layer absorber 33d. These are the same as the absorber 33 of the pants-type disposable diaper 1A of the first embodiment. Other forming materials are the same as the forming material of the diaper 1A of the first embodiment.

The effect at the time of using the underpants type disposable 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 in particular is the same as the effect of the diaper 1A of the first embodiment, and the description of the effect of the unfolded disposable diaper 1A of the first embodiment is applied as appropriate.

  As shown in FIG. 6, the diaper 1B of the second embodiment further includes a pair of second three-dimensional gathers 4b and 4b that stand up toward the wearer's skin side in the crotch part C. Leakage can be further prevented.

  As shown in FIG. 6, the diaper 1 </ b> B of the second embodiment has a shape around the leg that is closer to the shape of an infant, and is excellent in appearance.

Next, a pants-type disposable diaper according to a third embodiment of the present invention will be described with reference to FIGS.
About the underpants type disposable diaper 1C of 3rd Embodiment (henceforth "diaper 1C"), a different point from the underpants type disposable diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated in particular is the same as that of the pants-type disposable diaper 1A of the first embodiment, and the description of the pants-type disposable diaper 1A of the first embodiment is applied as appropriate.

  As shown in FIG. 7, the diaper 1 </ b> C of the third embodiment is such that only two pairs of three-dimensional gathers 4 are provided with two pairs of three-dimensional gathers 4 a and 4 b on both side portions 3 b and 3 b of the absorbent main body 3. Is different from diapers 1A. Moreover, the diaper 1C of 3rd Embodiment is that the elastic member 34 which raises the both sides 33b and 33b of the absorber 33 is arrange | positioned also to the absorptive main body 3 as shown in FIG. And different.

  As shown in FIGS. 7 and 8, the absorbent main body 3 of the diaper 1 </ b> C has two pairs of three-dimensional gathers (a first three-dimensional gather 4 a and a second three-dimensional gather 4 b) on both side portions 3 b and 3 b of the absorbent main body 3. It is arranged. In the diaper 1 </ b> C of the third embodiment, as shown in FIG. 7, the top sheet 31 is longer in the width direction (X direction) than the back sheet 32, and the outer end of the absorbent body 33 in the width direction (X direction). The portion extending from the edge is folded back to the non-skin contact surface side of the absorber 33 and joined to the back sheet 32, and the top sheet 31 and the back sheet 32 are both ends in the longitudinal direction (Y direction) of the absorber 33. The portions extending from the edge are joined to each other. By joining in this way, the vertically long rectangular absorbent main body 3 is formed.

  Each of the first three-dimensional gathers 4a and each of the second three-dimensional gathers 4b is in the longitudinal direction (Y direction) of the three-dimensional gather forming sheet 40 and the three-dimensional gather forming sheet 40 in the expanded and expanded state of the pant-type absorbent article. And a plurality of elastic members 41 arranged in an extended state. Specifically, in the diaper 1C of the third embodiment, as illustrated in FIG. 7, the three-dimensional gather forming sheet 40 is a single sheet, which is a top portion on the free end side of the second three-dimensional gather 4b. The sheet is folded in two along the fold line to form a two-ply sheet, and a plurality of elastic members 41 extending in the longitudinal direction (Y direction) are arranged between the two ply sheets and fixed with an adhesive to form a second solid. A gather 4b is formed. Furthermore, in the diaper 1C of the third embodiment, as shown in FIG. 7, the double-stacked sheet extends outward in the width direction (X direction) and becomes the top portion on the free end side of the first three-dimensional gather 4a. The sheet is further folded in two along the fold line to form a four-ply sheet, and a plurality of elastic members 41 stretched in the longitudinal direction (Y direction) are formed between the two-ply sheets constituting the four-ply sheet. The first three-dimensional gather 4a is formed by being arranged and fixed by an adhesive. In the diaper 1 </ b> C of the third embodiment, as shown in FIG. 7, the leading end portion of the double-stacked sheet is finally disposed between the top sheet 31 or the absorber 33 and the back sheet 32, and is fixed It is fixed at 6. Each of the second three-dimensional gathers 4b is formed so as to stand toward the wearer's skin side by contraction of the plurality of elastic members 41. The first three-dimensional gather 4a of the diaper 1C of the third embodiment is formed to stand by contraction of the plurality of elastic members 41, like the three-dimensional gather 4 of the diaper 1A of the first embodiment.

  In the diaper 1 </ b> C of the third embodiment, as shown in FIG. 8, the first three-dimensional gather 4 a stands up from the fixing portion 6 at the time of wearing, but is wider than the side edge portion 3 b 1 of the absorbent main body 3 ( (X direction) The outer part substantially functions as a three-dimensional gather. Therefore, in the diaper 1 </ b> C of the third embodiment, as shown in FIG. 7, the “part that functions as a three-dimensional gather” is that the side edge 3 b 1 of the absorbent main body 3 is composed of the three-dimensional gather forming sheet 40 and the surface sheet. 31 and the back sheet 32 are positioned outward in the width direction (X direction) from the fixed portion 6 to which the fixed sheet 6 is fixed, and therefore the portion of the first three-dimensional gather 4a that is outward in the width direction (X direction) from the side edge 3b1. That's it. As shown in FIG. 6, each of the pair of first three-dimensional gathers 4 a and 4 a of the diaper 1 </ b> C of the third embodiment is a width direction (X direction) of a portion extending in the width direction (X direction) from the side edge portion 3 b 1. An innermost region D near the center line CL, a first region E adjacent to the innermost region D, and a region F adjacent to the outer side of the first region E. And the outermost region G.

  In the diaper 1 </ b> C of the third embodiment, as shown in FIG. 7, the absorbent body 33 is disposed between both side portions 33 b and 33 b of the absorbent body 33 and the central portion 33 c sandwiched between the side portions 33 b and 33 b. A pair of spaces 33a, 33a in which the absorber 33 (core of the absorber) is not disposed is provided, and an upper-layer absorber 33d having a width smaller than that of the center portion 33c is provided on the center portion 33c. The upper layer absorbent body 33d extends at least to the crotch part C. In the diaper 1 </ b> C, as shown in FIG. 7, the absorbent main body 3 has elastic members 34 that are stretched in the longitudinal direction (Y direction) at the outer ends in the width direction (X direction) of both side portions 33 b and 33 b. Have. Each elastic member 34 is fixed between the side portion 33b and the top sheet 31 with an adhesive. The elastic force of each elastic member 34 is preferably smaller than the elastic force of the first elastic member 41a and larger than the elastic force of the elastic members 41 other than the first elastic member 41a. The elastic member 34 has a stretching force of 1 to 30 cN in a state where the elastic member 34 is stretched by 70% from the viewpoint that the width direction (X direction) outer end of the side portion 33b is likely to stand by contraction of the elastic member 34. It is preferably 1 to 20 cN.

The forming material of the pants-type disposable diaper 1C of the third embodiment will be described.
The elastic member 41 arranged in the first three-dimensional gather 4a and the second three-dimensional gather 4b is the same as the elastic member 41 arranged in the three-dimensional gather 4 of the pant-type disposable diaper 1A of the first embodiment, and also absorbs. The elastic member 34 arranged in the main body 3 is also the same as the elastic member 41 arranged in the three-dimensional gather 4 of the pant-type disposable diaper 1A of the first embodiment. Moreover, the upper layer absorbent body 33d of the diaper 1C is the same as the absorbent body 33 of the pants-type disposable diaper 1A of the first embodiment. Other forming materials are the same as the forming material of the diaper 1A of the first embodiment.

The effect at the time of using the underpants type disposable diaper 1C of 3rd Embodiment of this invention mentioned above is demonstrated.
About the effect of 1 C of diapers of 3rd Embodiment, a different point from the effect of 1 A of diapers of 1st Embodiment is demonstrated. The point which is not demonstrated in particular is the same as the effect of the diaper 1A of the first embodiment, and the description of the effect of the unfolded disposable diaper 1A of the first embodiment is applied as appropriate.

  Since the diaper 1C of the third embodiment further includes a pair of second three-dimensional gathers 4b and 4b that stand up toward the wearer's skin side in the crotch part C, as shown in FIGS. Lateral leakage of body fluid can be further prevented. Further, as shown in FIG. 8, the diaper 1C has a width direction (X direction) outer end of the side portion 33b of the absorbent body 33 on the skin side of the wearer at the crotch portion C due to the contraction force of the elastic member 34. Since it stands up, the side leakage of body fluid can be further prevented.

  As shown in FIG. 8, the diaper 1 </ b> C of the third embodiment can also act as a third three-dimensional gather by raising the side part of the absorber 4, and can further prevent side leakage of body fluid. .

  The pants-type disposable diaper of the present invention is not limited to the pants-type disposable diapers of the first, second, and third embodiments described above, and can be changed as appropriate. Moreover, each component in the underpants type disposable diaper of the above-mentioned 1st, 2nd, 3rd embodiment can be implemented in combination suitably in the range which does not impair the meaning of this invention.

  For example, in the pants-type disposable diapers 1A, 1B, and 1C of the first, second, and third embodiments described above, as shown in FIGS. 3 (a), 6, and 7, the absorber 33 is an absorber. Although it has a pair of space part 33a, 33a where 33 (core of an absorber) is not arranged, it does not need to have space part 33a.

  Further, in the pant-type disposable diaper 1A of the first embodiment described above, the abdomen sheet 2A extends downward along the abdomen sheet body 20A and the lower edge 200 of the abdomen sheet body 20A when worn. A side extending portion 21A is provided, and the back seat 2B includes a back side seat main body 20B and a back side extending portion 21B, but one of the ventral side extending portion 21A and the back side extending portion 21B. May not be provided, and none of them may be provided.

  The pant-type absorbent article may be a pants-type sanitary napkin or the like in addition to a pants-type disposable diaper for infants or adults.

1A, 1B, 1C Pants-type disposable diaper 2 Exterior body 2a Side edge part in abdominal side part A, 2b Side edge part 2A in back side part B Abdominal side sheet 20A Abdominal side sheet body 200 Lower edge of abdominal side sheet body 20a Belly Side edge portion of side seat body 21A Abdominal side extension portion 201 Lower edge of abdominal side extension portion 21a Side edge portion 2B of abdominal side extension portion Back side seat 20B Back side seat body 200 Bottom edge of back side seat body 20b Side edge part of back side seat body 21B Back side extension part 201 Lower edge of back side extension part 21b Side edge part of back side extension part 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 3 Absorbent body 3a Absorbent body End portion 3b in the longitudinal direction (Y direction) of the side 3b1 in the longitudinal direction (Y direction) of the absorbent main body Side edge portion in the longitudinal direction (Y direction) of the absorbent main body 31 Top sheet 32 Back sheet 33 Absorber 33a Absorber space portion 33b Absorber side portion 33c Absorber center portion 33d Upper layer absorber 34 Elastic member 4 Solid gather 40 Solid gather forming sheet 41 Elastic member 41a First elastic member 42 Inner forming sheet 43 Outer forming sheet D Innermost region E First region F region G Outermost region G1 Tip of outer region G (outer end)
5 side seal part 6 fixed part A ventral side part, B dorsal side part, C crotch CL centerline extending in the longitudinal direction of the diaper, CT center of the diaper

Claims (4)

The abdomen seat disposed on the abdomen side of the wearer at the time of wearing, the back side sheet disposed on the back side of the wearer at the time of wearing, and fixed through the fixing part over the abdomen sheet and the back side sheet. An absorbent main body, and a pair of three-dimensional gathers disposed on both sides of the absorbent main body, wherein both side edges of the abdomen seat and the back seat are joined together to form a waist opening and a pair of legs A pants-type absorbent article having an opening formed therein,
Each of the pair of three-dimensional gathers includes a three-dimensional gather forming sheet and a plurality of elastic members arranged in an extended state in the longitudinal direction of the three-dimensional gather forming sheet in the expanded and expanded state of the pant-type absorbent article. The three-dimensional gather forming sheet extends outward in the width direction from the side edge of the absorbent main body, one end in the longitudinal direction is fixed to the ventral sheet, and the other end is the back. It is fixed to the side sheet, and is formed to stand by contraction of a plurality of the elastic members,
Each of the pair of three-dimensional gathers is separated from the side edge of the absorbent main body outward in the width direction by a first elastic member having the largest stretching force, and further away from the first elastic member in the width direction outward. It was closed and the elastic member other than the first elastic member in position,
Each of the pair of three-dimensional gathers has four regions that are outward in the width direction from the side edge portions of the absorbent main body and divide the portion that functions as a three-dimensional gather into four equal parts, and are adjacent to the innermost region. A pants-type absorbent article in which the first elastic member is arranged in the first region to be fitted and the expansion / contraction force of the first region is the largest . An exterior body, an absorbent main body fixed to the inner surface side of the exterior body, and a pair of three-dimensional gathers disposed on both sides of the absorbent body. A waist opening portion having a ventral side portion disposed on the side and a back side portion disposed on the back side of the wearer at the time of wearing, wherein both side edges of the abdominal side portion and the back side portion are joined together And a pair of leg openings formed underpants type absorbent article,
Each of the pair of three-dimensional gathers includes a three-dimensional gather forming sheet and a plurality of elastic members arranged in an extended state in the longitudinal direction of the three-dimensional gather forming sheet in the expanded and expanded state of the pant-type absorbent article. The three-dimensional gather forming sheet extends outward in the width direction from the side edge of the absorbent main body, one end in the longitudinal direction is fixed to the ventral sheet, and the other end is the back. It is fixed to the side sheet, and is formed to stand by contraction of a plurality of the elastic members,
Each of the pair of three-dimensional gathers is separated from the side edge of the absorbent main body outward in the width direction by a first elastic member having the largest stretching force, and further away from the first elastic member in the width direction outward. It was closed and the elastic member other than the first elastic member in position,
Each of the pair of three-dimensional gathers has four regions that are outward in the width direction from the side edge portions of the absorbent main body and divide the portion that functions as a three-dimensional gather into four equal parts, and are adjacent to the innermost region. A pants-type absorbent article in which the first elastic member is arranged in the first region to be fitted and the expansion / contraction force of the first region is the largest . The pants-type absorbent article according to claim 1 or 2 , wherein the elastic member is not arranged at the outermost ends of the four regions of the three-dimensional gather. The pants-type absorbent article according to any one of claims 1 to 3 , wherein the shrinkage force of each of the four regions of the three-dimensional gather gradually increases from the outermost region toward the first region.

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