JP4917365B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, as an absorbent article that absorbs and holds excrement such as urine and feces excreted from the body, for example, a liquid-permeable top sheet, a liquid-impermeable back sheet, a top sheet and a back sheet Disposable diapers comprising a liquid-retaining absorbent disposed between them are known. Such disposable diapers hold urine and other excretions excreted when worn with an absorbent body via a liquid-permeable surface sheet, and the liquid-impermeable back sheet allows the excrement to be removed from the absorbent article. It has a structure that prevents leakage.

  In the disposable diaper, various devices have been made for the purpose of preventing leakage of excrement such as defecation and improving the holding function. For example, an absorbent core is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and the absorbent core is composed of an upper layer core and a lower layer core that bisect the thickness direction, and when mounted In the portion where the upper layer core contacts the buttocks, the front core and the rear core bisect the front-rear direction. A disposable diaper having a stool holding pocket is provided (see, for example, Patent Document 1).

  However, even if it is invention of patent document 1, when a diaper stings in a wearer's buttocks at the time of wear of an absorbent article, it absorbs between a front side core and a lower layer, a back side core, and a lower layer. Since a step corresponding to the thickness of the body is generated, there is a case where the wearer feels uncomfortable.

  Also, the lateral edges of the absorbent core are chamfered in parallel to each other, facilitating longitudinal movement between adjacent independent segments of the absorbent core, thereby allowing the wearer's body from the front It is possible to provide an absorbent body that adapts to differences in the body applied to the back. This configuration provides a disposable diaper that frees the longitudinal edge of the core and maximizes relative movement in the Z direction at the edge, thereby increasing adhesion to the body ( For example, Patent Document 2).

However, the edge of the independent segment is relatively moved to a position away from the body in the Z direction with respect to the center portion, so that the center portion is in close contact with the body, but the deformation is controlled. In some cases, it was not always possible to make the desired deformation.
Japanese Patent No. 3130438 Japanese Patent No. 3233930

  This invention is made | formed in view of the above, and makes it a subject to provide a disposable diaper provided with the absorber which can deform | transform into a predetermined shape.

  The present inventor improves not only a function of preventing leakage of excrement such as defecation and a storage function by forming a notch-shaped recess on both sides of a vertically long absorbent body and making the absorbent body deformable to a predetermined shape. The present invention has been completed.

  (1) A chassis having at least a front body and a back body, having a width direction and a longitudinal direction perpendicular to the width direction, and extending from the predetermined position in the front body to a predetermined position in the rear body along the longitudinal direction. A disposable diaper comprising at least a longitudinally-shaped absorbent body disposed on the absorbent body, the absorbent body from a center line that bisects the absorbent body in the longitudinal direction to a rear edge on the back body side A disposable diaper comprising a bending guide part formed at a predetermined position.

  (2) The bending guide part is a narrow part formed so as to be narrower than an adjacent region, a low density part formed by lowering the density of the material constituting the absorber from the adjacent region, It is either a low basis weight part formed by reducing the basis weight of the material constituting the absorber from adjacent regions, or a separation part formed by arranging different absorbers apart (1 ) Disposable diapers.

  (3) The bending guiding portion is the narrow portion, and a notch-shaped concave portion formed at a side edge in the width direction of the absorber is formed on each side of the narrow portion (2 ) Disposable diapers.

  (4) a pair of first stretchable members arranged along the longitudinal direction at both side edges in the width direction of the absorbent body, and both ends of the stretchable member in the longitudinal direction are bent The disposable diaper according to any one of (1) to (3), which is disposed on each of the one side and the other side in the longitudinal direction with respect to the guide part.

  (5) In the mounted state, the absorbing portion bends from the bending guiding portion to the trailing edge of the absorber so as to rise in the thickness direction of the absorbing member using the bending guiding portion as a bending gland ( The disposable diaper according to any one of 1) to (4).

  (6) A chassis having at least a front body and a back body, having a width direction and a longitudinal direction perpendicular to the width direction, and extending along the longitudinal direction from a predetermined position in the front body to a predetermined position in the rear body A disposable diaper comprising at least a longitudinally-shaped absorbent body disposed on the front body side absorber disposed mainly on the front body side, and mainly on the back body side Between the rear body side absorbent portion to be arranged, the central absorbent portion formed between the front body side absorbent portion and the back body side absorbent portion, and between the front body side absorbent portion and the central absorbent portion. A disposable diaper provided with the 1st narrow part formed and / or the 2nd narrow part formed between the said back body side absorption part and the said center absorption part.

  (7) The disposable absorbent diaper according to (6), wherein the central absorbent portion has a biconvex shape that protrudes outward in the width direction.

  (8) The center absorption portion includes a pair of gap portions or thin portions formed along the longitudinal direction on both sides of a center line that bisects the center absorption portion in the width direction. The disposable diaper described.

  (9) The disposable diaper according to (8), wherein the outer contour line on the outer side in the width direction in each of the gap portion or the thin portion is a convex shape protruding outward in the width direction.

  (10) The notched recesses formed at the side edges in the width direction of the absorber are formed on both sides of the second narrow portion, respectively, according to any one of (6) to (9). Disposable diapers.

  (11) The concave portion is formed by a side edge in the back body side absorbent portion and a side edge in the central absorbent portion, and a side edge of the back body side absorbent portion forming the concave portion is substantially straight. Each of the gap or the thin part is formed such that an end on the back body side of the gap or the thin part is positioned on or near an extension line at a side edge of the back body side absorption part ( The disposable diaper as described in 10).

  (12) A pair of first stretchable members arranged along the longitudinal direction in the vicinity of both side edges in the width direction of the absorbent body, and both ends of the first stretchable member in the longitudinal direction are The disposable diaper according to any one of (6) to (11), which is arranged in the vicinity of the front edge and the rear edge in the longitudinal direction of the absorbent body.

  (13) The disposable diaper according to any one of (6) to (12), further including a third elastic member disposed in the back body, wherein the third elastic member is disposed to extend in the width direction.

  (14) At least at the time of mounting, the chassis opening is formed by the front edge and the rear edge in the longitudinal direction of the chassis, and is formed by the side edge in the width direction of the chassis formed on the side facing the body opening. A pair of leg openings, and a second stretchable member arranged along a side edge forming the leg openings in the back body, and at least a part of the second stretchable member The disposable diaper according to any one of (6) to (13), which is disposed in the vicinity of the second narrow portion.

  (15) In the mounted state, the back body side absorption portion is bent so as to rise in the thickness direction of the absorber using the second narrow portion as a bending gland, and the central absorption portion is formed on the outer side in the width direction. Each of the side regions is bent so as to rise in the thickness direction, and a predetermined cavity is formed by the bent back body side absorbing portion, the central region in the width direction of the central absorbing portion, and the bent side region. The disposable diaper according to any one of (6) to (14), wherein the part is formed.

  (16) The central absorbent portion includes a pair of gaps or thin portions formed along the longitudinal direction on both sides of a center line that bisects the central absorbent portion in the width direction, An area | region is a disposable diaper as described in (15) which is the area | region of the said width direction outer side in each said space | gap part or thin part.

  (17) An absorbent body for a disposable diaper that is used in a disposable diaper including a chassis having at least a front body and a back body, the front body side absorbent part being mainly disposed on the front body side, and mainly the rear A rear body side absorbent part disposed on the body side, a central absorbent part formed between the front body side absorbent part and the back body side absorbent part, the front body side absorbent part and the central absorbent part; The absorbent body for disposable diapers provided with the 1st narrow part formed between and / or the 2nd narrow part formed between the said back body side absorption part and the said center absorption part.

  (18) The absorbent body for disposable diapers according to (17), wherein the central absorbent portion has a biconvex shape that projects in the width direction.

  (19) The center absorption portion includes a pair of gaps or thin portions formed along the longitudinal direction on both sides of a center line that bisects the center absorption portion in the width direction. The absorbent body for disposable diapers as described.

  ADVANTAGE OF THE INVENTION According to this invention, a disposable diaper provided with the absorber which can deform | transform into a predetermined shape can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment of this invention is not limited to the following embodiment at all, and the technical scope of this invention is not limited to this.

  In the present embodiment, a pants-type disposable diaper that forms a trunk opening and a pair of leg openings by mainly joining the front body and the back body at a predetermined joint will be described. It is not limited to type disposable diapers. For example, the deployment type disposable diaper which can be worn by locking a front body and a back body with a locking member etc. is included. Further, for example, at a predetermined joint portion of the front body and the back body of a disposable diaper formed in a pants shape, it is engaged by a locking member such as a hook-and-loop fastener that can be re-locked as used in a deployable disposable diaper. It includes a disposable diaper that is a pants-type disposable diaper that can be stopped and can be easily unlocked and the pant-type disposable diaper can be deployed and re-locked.

  Furthermore, although this embodiment demonstrates the disposable diaper for children, in this invention, it is not restricted to this. For example, a disposable diaper for adults is included. Moreover, in the disposable diaper absorber which concerns on this invention, diaper pads, such as a urine pad used for a diaper cover etc., are included.

  FIG. 1 is a perspective view of a disposable diaper according to the first embodiment of the present invention. Drawing 2 is an expanded view showing the state where the disposable diaper concerning a 1st embodiment was developed. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is an exploded view of the disposable diaper according to the first embodiment. FIG. 5A is a front view of an absorbent body in the disposable diaper according to the first embodiment. FIG. 5B is a cross-sectional view taken along the line XX in FIG. FIGS. 6A to 6D are diagrams showing a deformed state of the absorber. FIG. 7 is a perspective view showing the absorber after deformation. FIG. 8 is a diagram for explaining the state of the absorbent body when being worn. FIG. 9 is a development view showing a state in which the disposable diaper according to the modification of the first embodiment is developed. FIG. 10 is a developed view showing a state in which the disposable diaper according to the second embodiment is developed. FIG. 11A is a front view of the absorbent body in the disposable diaper according to the second embodiment, and FIG. 11B is a perspective view showing the absorbent body after deformation. FIG. 12 is a diagram for explaining a state of the absorbent body at the time of wearing. FIG. 13 is a development view showing a state in which the disposable diaper according to the third embodiment is developed. FIG. 14 is a plan view showing a modified form of the absorber. FIG. 15 is a plan view showing a modified form of the absorber. FIG. 16 is a plan view showing a modified form of the absorber. FIG. 17A is a plan view showing a modified form of the absorber. FIG. 17B is a YY cross-sectional view of FIG. FIG. 18 is a plan view showing a modified form of the absorber.

[1] First Embodiment [1.1] Overall Configuration The overall configuration of the disposable diaper according to the present invention will be described using the pant-type disposable diaper 1 in the first embodiment of the present invention. In the present embodiment, one side of the disposable diaper 1 that is directed to the wearer's body is a skin contact surface side, and the other side opposite to the skin contact surface side is a non-skin contact surface side.

  As shown in FIG. 1, the disposable diaper 1 which concerns on this embodiment forms the external shape of the disposable diaper 1, and is arrange | positioned in the position applicable to the wearer's crotch part with the chassis 2 which forms a trunk periphery at the time of mounting | wearing. Crotch part 23. As shown in FIG. 2, the chassis 2 includes a front body 21 that is disposed on the wearer's abdomen side and a back body 22 that is disposed on the wearer's back side. A crotch portion 23 is disposed between the body 22 and the body 22.

  The crotch part 23 is narrower than the front body 21 and the back body 22 in the width direction of the disposable diaper 1, and the front body 21 and the back body 22 continuous with the crotch part 23 are also partly wide. It is narrowed. In other words, the disposable diaper 1 is formed such that, in the unfolded state, both edges in the longitudinal direction are wide and the central area in the longitudinal direction is narrow. That is, the side edges 95 and 97 on the outer side in the width direction of the disposable diaper 1 form a concave portion 205 such that the central area in the longitudinal direction becomes narrow. In other words, the disposable diaper 1 is formed in a so-called hourglass shape.

  As shown in FIG. 1, the disposable diaper 1 has a pants-type shape by joining the front body 21 and the back body 22 at predetermined joint portions 24 formed on both side edges of the front body 21 and the back body 22. Formed.

  Specifically, as shown in FIG. 2, a joining portion 24 a in the front body 21 and a joining portion 24 b in the back body 22 are bonded together to form a pants shape.

  Then, as shown in FIG. 1, each of the concave portions 205 constituted by a part of the side edges 95 and 97 forms a pair of leg openings 7. Then, both edges (the front edge 91 and the rear edge 93) in the longitudinal direction in the developed state form the body opening 8.

  A predetermined elastic member can be disposed in the leg opening 7 along the opening in the leg opening 7. Specifically, thread-like or belt-like elastic members 72 can be respectively arranged on the side edge portions of the front body 21 and the back body 22 that form the concave portion 205 so as to follow the side edge portions. Thereby, a so-called leg gather 71 can be provided.

  Similarly, a predetermined elastic member can be arranged in the trunk opening 8 along the opening in the trunk opening 8. Specifically, a thread-like or belt-like elastic member 82 is disposed on the front edge 91 of the front body 21 along the front edge 91, and the thread-shape is formed on the rear edge 93 of the back body 22 along the rear edge 93. Alternatively, a belt-like elastic member 82 can be disposed. Thereby, what is called a waist gather 81 can be provided.

  In the present embodiment, the crotch portion 23 is disposed between the front body 21 and the back body 22 of the chassis 2 having the front body 21 and the back body 22. However, in the present invention, such a form is used. It is not limited. For example, the chassis 2 may be configured to have a front body 21, a back body 22, and a crotch 23. For example, the chassis 2 may have the front body 21 and the back body 22, and the independent crotch part which has the surface sheet 3, the absorber 4, and the back surface sheet 5 may be joined with the chassis 2. In this case, the back sheet 5 and the chassis 2 at the crotch part may be joined, or the back sheet 5 may have the role of the chassis 2.

  Moreover, as shown in FIG. 4, the disposable diaper 1 is provided in the skin contact surface side of a wearer, The liquid-permeable surface sheet 3 formed in the vertically long shape which comprises a surface layer, The surface sheet 3, A liquid-retaining absorbent body 4 disposed between the chassis 2 and formed in a vertically long shape that constitutes an absorbent layer, and a vertically long shape that is provided on the non-skin contact surface side of the wearer and constitutes a back layer. And a liquid-impermeable back sheet 5 formed. Each of the top sheet 3, the absorber 4, and the back sheet 5 is disposed along the crotch portion 23 along the front body 21 to the back body 22. Thereby, excrement such as urine excreted from the excretion part passes through the liquid permeable region in the top sheet 3 and is absorbed by the absorber 4. Since the back sheet 5 disposed on the non-skin contact surface side is liquid-impermeable, excrement such as urine does not permeate the non-skin contact surface side and is absorbed by the absorber 4. Will be retained.

  In addition, in this embodiment, although the back surface sheet 5 has been arrange | positioned at the wearer's non-skin contact surface side, for example, between the absorber 4 and the chassis 2, or the chassis 2 is formed from a plurality of sheet members. In the case of being formed, it may be arranged between the respective sheet members. Moreover, you may use the back surface sheet 5 which joined the nonwoven fabric etc. to the non-skin contact surface side of this back surface sheet 5. FIG. It is preferable to bond a non-woven fabric or the like to the non-skin contact surface side of the back sheet 5 because the touch when the wearer is worn is improved. In addition, when a film is used for the back sheet 5, it is preferable to bond a non-woven fabric or the like to the film, for example, because unpleasant sound generated from the rubbing of the film can be prevented.

  As shown in FIG. 3 or FIG. 4, the disposable diaper 1 includes a leak-proof wall 6 formed using an elastic member 61 and a leak-proof sheet 62. The leak-proof wall 6 is arranged along the longitudinal direction of the absorber 4 at the side edge on the outer side in the width direction of the absorber 4. Specifically, a leak-proof sheet 62 is provided so as to extend in the thickness direction of the absorber 4 from between the absorber 4 and the chassis 2 or the back sheet 5, and the leak-proof sheet 62 is not fixed. At least one elastic member 61 is disposed on the end side and fixed with a hot melt adhesive or the like. Then, the leakage preventing sheet 62 is folded back to the skin contact surface side so as to wrap the absorbent body 4 at the center side in the width direction of the absorbent body 4, and further folded back to the outer edge side in the width direction of the absorbent body 4. (See FIG. 3). Thereby, the leak-proof wall 6 is formed. The leak-proof wall 6 may be formed in a state where the leak-proof sheet is extended in the width direction of the absorber 4.

  In the case where the leak-proof wall 6 extends from the absorber 4 to the outer edge side in the width direction of the absorber 4, the elasticity of the absorber 4 and the leak-proof wall 6 in the substantially central region 40 in the longitudinal direction of the absorber 4. The distance from the member 61 is preferably in the range of 20 mm or more. Further, in the case where the leak-proof wall 6 is folded back, in the state where the leak-proof sheet 62 of the leak-proof wall 6 is expanded in the width direction in the substantially central region 40, the elasticity of the absorber 4 and the leak-proof wall 6. The distance from the member 61 is preferably in the range of 20 mm or more.

[1.2] Chassis As shown in FIG. 1 or FIG. 2, the chassis 2 is disposed on the front body 21 disposed on the wearer's abdomen side when worn (at the time of wearing) and on the wearer's back side. And a rear body 22. Further, the chassis 2 includes a crotch portion 23 disposed between the front body 21 and the back body 22. The chassis 2 includes a joint portion 24 in which a part of each side edge of the front body 21 and the back body 22 is joined. In other words, the front body 21 and the back body 22 are joined by intermittently joining the joints 24a and 24a in the front body 21 and the joints 24b and 24b in the back body 22 by, for example, ultrasonic sealing. Is done. Thereby, the chassis 2 is formed in a pants shape. As another joining method in this joining part 24, joining by a heat seal, a hot-melt adhesive agent, etc. can be illustrated.

  A plurality of thread-like elastic members 82 are arranged in a waist gather 81 formed in the peripheral region of the trunk opening 8. The elastic member 82 may be a belt-like member. As the elastic member 82, for example, a stretchable nonwoven sheet such as a nonwoven fabric formed from a mixed fiber of polyurethane and polypropylene, or a stretchable elastic sheet such as a stretchable film can be used.

  A plurality of thread-like elastic members 72 are arranged in a leg gather 71 formed in at least a part of the leg opening 7. The elastic member 72 may be a belt-shaped member. As the elastic member 72, an elastic sheet having elasticity such as a stretchable nonwoven fabric such as a nonwoven fabric formed from a mixed fiber of polyurethane and polypropylene or a stretchable film can be used.

  As shown in FIG. 1, the elastic member 72 constituting the leg gather 71 is disposed along the periphery of the leg opening 7. In the pant-type state in FIG. 1, the elastic member 72 is arranged in an arch shape on the upper side (the trunk opening 8 side) of the leg opening 7. Referring to the developed view of FIG. 2, the elastic member 72 is arranged along a part of the concave part 205 which is a part of the side edges 95 and 97 constituting the leg opening 7.

  Specifically, the elastic member 72 is disposed along the side edge on the front body 21 side and the side edge on the rear body 22 side that constitute the concave portion 205, and is disposed on the side edge of the crotch part 23. Absent. And the elastic member 72 which is a 2nd expansion-contraction member arrange | positioned along the side edge which comprises the leg opening 7 in the back body 22 has the edge part inside the longitudinal direction in this elastic member 72 the absorber 4 mentioned later. It arrange | positions so that it may be located in the vicinity of the 2nd narrow part in.

  In all or part of the chassis 2, thread-like elastic members 26 extending in the width direction are arranged at predetermined intervals in the longitudinal direction. In other words, the thread-like elastic member 26 is disposed on all or part of the front body 21 and the back body 22. Thereby, it is prevented that the disposable diaper 1 slides down. In the present invention, the disposable diaper 1 has the thread-like elastic member 26 disposed on the chassis 2, but the present invention is not limited thereto. For example, you may arrange | position the elastic sheet which has stretch properties, such as a stretchable nonwoven fabric and a stretchable film, in all or a part of the chassis 2.

[1.3] Absorber [1.3.1] Overall Configuration As shown in FIG. 5 (A) or FIG. 5 (B), the absorber 4 is formed in a vertically long shape. The absorber 4 is mainly composed of a front body side absorber 43 disposed on the front body 21 side, a back body side absorber 44 disposed on the back body 22 side, and a central absorber 45 disposed on the crotch 23. And comprising. And the 1st narrow part 100 formed between the front body side absorption part 43 and the center absorption part 45, and the 2nd narrow width formed between the back body side absorption part 44 and the center absorption part 45 Unit 110.

  The absorber 4 has a substantially rectangular shape, and side edges 195 and 197 extend in a longitudinal direction from the front edge 191 of the absorber 4 and a first concave shape protruding inward in the width direction continuous to the straight line, It is constituted by a convex shape bulging outward in the width direction continuous to the first concave portion, a second concave shape continuous to the convex shape, and a straight line having a predetermined length extending in the longitudinal direction continuous to the second concave shape. The A first concave portion 46 and a second concave portion 47 constituted by side edges 195 and 197 are formed on the outer side in the width direction of the absorber 4. In other words, the first recesses 46 are formed at both ends of the first narrow portion 100, and the second recesses 47 are formed at both ends of the second narrow portion 110.

  The central absorbent portion 45 has a biconvex shape in which the side edges 195b and 197b swell outward in the width direction. Moreover, the center absorption part 45 is provided with a pair of space | gap part 41 (or thin part) formed along the longitudinal direction on both sides of the center line C which bisects the center absorption part 45 in the width direction.

  The gap portion 41 (or the thin portion) has a function of inducing deformation of the absorber 4 together with the first narrow portion 100 and the second narrow portion 110. For example, the second narrow portion 110 can be induced to bend the rear body side absorption portion 44 so as to rise in the thickness direction. For example, the gap portion 41 induces bending of a region outside the width direction of the gap portion 41 so as to rise in the thickness direction. And the cavity 4 (refer FIG. 7) which can accommodate a predetermined amount of feces can be formed, for example by deform | transforming the absorber 4 in this way.

[1.3.1.1] Front body side absorption part The front body side absorption part 43 is substantially rectangular and is deformed so that the side edges 195a, 197a are directed inward in the width direction so that the central absorption part 45 side becomes narrow. is doing. For example, the front body side absorption part 43 abuts on the urination part and absorbs excreted urine.

[1 / 3.1.2] Back Body Side Absorbing Section The back body side absorbing section 44 is substantially rectangular and is deformed so that the side edges 195a and 197a are directed inward in the width direction so that the central absorbent section 45 side becomes narrow. is doing. The back body side absorption unit 44 absorbs excrement such as defecation and suppresses leakage of the defecation and the like.

[1.3.1.3] Central Absorbing Portion and Space Cavity The central absorbing portion 45 has a biconvex shape that protrudes outward in the width direction. The central absorbent portion 45 has a pair of convex portions 42 and 42 that protrude so as to swell outward in the width direction of the absorber 4 in directions opposite to each other. The shape of the outer edge of the convex portions 42, 42 is preferably formed in a curved shape with a low curvature, for example, but is not limited to this in the present invention. For example, it may be formed in a trapezoidal shape. Furthermore, in the present embodiment, a pair of convex portions 42 and 42 are provided in the central absorbent portion 45, but the present invention is not limited to this. For example, a plurality of pairs of convex portions 42 and 42 may be provided in the central absorbent portion 45.

  On the inner side in the width direction of the convex portions 42, 42 are vertically long gap portions 41, 41 that are symmetrical to each other with respect to a substantially center line C that bisects the width direction of the absorber 4 and extend along the longitudinal direction. Is formed. In other words, the convex portions 42 and 42 are formed on the outer sides in the width direction of the gap portions 41 and 41, respectively. The voids 41 and 41 are formed by not arranging the absorbent material constituting the absorber 4. The void portions 41 and 41 are vertically long extending in the longitudinal direction of the absorbent body 4, and the outer outlines in the width direction of the void portions 41 and 41 are formed in a convex shape protruding so as to swell toward the outer edge side in the width direction. Is done.

  The convex portions 42 and 42 can be bent so as to rise in the thickness direction of the central absorbent portion 45. For example, when a force is applied to the central absorbent portion 45 from the outer side in the width direction toward the inner side in the width direction, the convex portions 42 and 42 bend so as to rise in the thickness direction of the central absorbent portion 45. For example, by making the width of the central absorbent portion 45 wider than the crotch width of the person to be used, it becomes easier to receive a force toward the inner side in the width direction by the thigh.

  The gap portions 41 and 41 can have a function of inducing the bending of the convex portions 42 and 42 described above. That is, the convex portions 42 and 42 can be bent with the gap portions 41 and 41 as bending lines, and the bent state is easily maintained.

  Specifically, as shown in FIG. 6B, the gap portions 41 and 41 are convex curved portions 411 that protrude toward the side edges 195 b and 197 b that are outside in the width direction of the central absorbent portion 45. 411 and linear starting point portions 412 and 412 extending along the longitudinal direction. When the disposable diaper 1 is worn (at the time of wearing), it receives a compressive force from the wearer's thigh to the inner side in the width direction, and the convex portions 42 and 42 are deformed, and are formed linearly. The starting point portions 412 and 412 become bending starting points (lines). This is because the curved portions 411 and 411 disperse stress because the outer edges (outline) are curved. When the convex portions 42, 42 are deformed so as to rise to the skin contact surface side of the wearer, the compressive force transmitted from the convex portions 42, 42 to the gap portions 41, 41 is the curved portion 411 of the gap portions 41, 41. Since the compression force is released in the tangential direction of the curved portions 411 and 411, the gap portions 41 and 41 can be held without being crushed. Further, since the gap portions 41 and 41 do not dispose an absorbent material, excrement such as urine can freely run inside the gap portions 41 and 41 with less resistance and quickly diffuse in other directions. Therefore, the absorption rate can be improved.

  The curved portions 411 and 411 may be formed so as to draw an arc that is substantially parallel to the side edges 195b and 197b that are the outer edges of the convex portions 42 and 42 (for example, the rotation axis is coaxial, for example). preferable. Thereby, for example, it becomes possible to prevent the absorber 4 from being broken or torn. In addition, for example, when the disposable diaper 1 is worn, even if the compressive force is received from the wearer's thigh, the compressive force transmitted from the convex portions 42 and 42 can be released in the tangential direction of the curved portions 411 and 411. This is because the gaps 41 and 41 can be prevented from being crushed by the compressive force from the wearer's thigh and the skin contact surface side.

  Here, the length of the gaps 41, 41 in the longitudinal direction is preferably 10 mm or more, for example. More preferably, 50 mm to 100 mm can be illustrated. Moreover, as the length in the width direction of the space | gap parts 41 and 41, it is 5 mm or more, for example, Comprising: It is preferable that it is the range of 50% or less of the length of the width direction in the center absorption part 45 of the absorber 4. More preferably, it can illustrate that it is the range of 5 mm to 40 mm.

  In addition, in this embodiment, although the space | gap parts 41 and 41 were formed in the convex shape extended along the longitudinal direction and protruded on the width direction outer side, in this invention, it is not restricted to this. For example, you may form so that a substantially trapezoid-shaped space | gap part may extend in the longitudinal direction of the absorber 4. FIG. As described above, the gaps 41 and 41 may have a shape extending in the longitudinal direction so that the lengths in the width direction are all different. Moreover, the shape where a semicircle shape was attached to a part of rectangle may be sufficient. As described above, the gaps 41 and 41 may have shapes having different lengths in the width direction in at least a part in the longitudinal direction. Moreover, you may provide one space | gap part extended in a longitudinal direction between the convex-shaped space | gap parts 41 and 41 extended in a longitudinal direction and projecting in the width direction. As described above, a plurality of gaps may be provided. Further, the gap portions 41 and 41 may form two or more curved convex portions.

  In the present embodiment, the gaps 41 and 41 are provided at positions that are symmetrical to each other with respect to a substantially center line C that extends in the longitudinal direction of the absorber 4 and bisects the width direction. One configuration may be provided on the center line C. In this case, it is because the absorber 4 can form the accommodating part for accommodating urine and feces by deform | transforming into a substantially V shape. In addition, a plurality of gap portions 41, 41 may be provided. In this case, it is preferable that the area of the absorber 4 in the central absorbent portion 45 is in a range of 50% or more than the area of the gap portions 41 and 41. For example, if the area of the voids 41 and 41 when the absorbent material is not disposed exceeds the range of 50% of the area of the central absorption part 45, there is a possibility that excrement such as urine leaks in the central absorption part 45. Because.

  Here, instead of the gap portions 41, 41, a thin portion that is formed thin by reducing the material constituting the absorber 4, or a compressed portion that is formed by pressing the absorber 4 with embossing or the like. It may be formed.

  Thus, the disposable diaper 1 can make the absorber 4 wide by providing the convex part 42 in the center absorption part 45. For example, even when the later-described gap portions 41 and 41 are provided in the central absorbent portion 45, the area of the absorber 4 in the central absorbent portion 45 can be increased. In addition, by providing the void portions 41 and 41 where no absorbent material is disposed, as described above, the bending of the convex portions 42 and 42 can be induced, and the diffusion / absorption rate of urine and the like can be improved.

Here, the convex portions 42 and 42 can be formed to have a lower swelling ratio at least in the crotch portion 23 than the substantially central region 40 sandwiched between the gap portions 41 and 41. For example, the convex portions 42 and 42 can be formed so that the basis weight is smaller than that of the substantially central region 40. That is, the swelling rate can be lowered by adjusting the basis weight to reduce the basis weight. For example, when the basis weight of the substantially central region 40 is 550 g / m ² to 650 g / m ² , the basis weight of the convex portions 42 and 42 may be 220 g / m ² to 620 g / m ² . In other words, the basis weight of the convex portions 42 and 42 with respect to the basis weight of the substantially central region 40 can be exemplified as being in the range of 40% to 95%. Note that the substantially central region 40 refers to a region sandwiched between lines L and R extending in the longitudinal direction across the substantially central portion in the width direction of each of the gap portions 41 and 41 shown in FIG. Further, the swelling rate means a rate of change in volume in a wet state with respect to a volume in a dry state of the absorbent material constituting the absorbent body 4. That is, the higher the swelling rate, the greater the increase in volume in the wet state, and the lower the swelling rate, the greater the increase in volume in the wet state.

  Thus, when the convex parts 42 and 42 in at least the crotch part 23 are formed with a lower swelling rate than the substantially central region 40, for example, when the disposable diaper 1 is worn, the compressive force is applied from the wearer's thigh. In the state where the convex portions 42 and 42 are deformed so as to rise toward the wearer's skin contact surface, it is possible to suppress a decrease in the space volume of the cavity 48 that can accommodate defecation and the like. That is, as shown in FIG. 7, the convex portions 42 and 42 constituting the rising side wall of the cavity 48 formed after the deformation are formed with a lower swelling rate than the substantially central region 40 disposed at the bottom due to the deformation. Therefore, the amount of swelling in the central part direction (inner side) due to swelling is small, and it is possible to narrow the entrance of the cavity 48 and to reduce the decrease in the accommodation volume such as defecation.

[1.3.2] Bending guiding portion and narrow portion As shown in FIG. 5, the absorber 4 includes a first narrow portion 100 and a second narrow portion 110 that are formed to be narrow in the width direction. Is provided. At both ends of the first narrow portion, notched first concave portions 46 and 46 formed by side edges 195 and 197 in the width direction of the absorber 4 are formed, respectively. Similarly, notched second concave portions 47 and 47 formed by side edges 195 and 197 in the width direction of the absorber 4 are formed at both ends of the second narrow portion 110, respectively.

  The side edges 195b and 197b of the central absorbent portion 45 are formed in a convex shape that swells outward in the width direction, and first recesses 46 and 46 formed in a notch shape are formed on one end side, and the other end side is cut. Second recesses 47, 47 formed in a notch shape are formed. In other words, the first recesses 46 and 46 are formed by the side edges 195 a and 197 a of the front body side absorption part 43 and the side edges 195 b and 197 of the central absorption part 45. And the 2nd recessed parts 47 and 47 are formed by the side edges 195c and 197c of the back body side absorption part 44, and the side edges 195b and 197 of the center absorption part 45. FIG.

  Here, the depth of the second recesses 47, 47 formed at both ends of the second narrow portion is 10 mm or more in the width direction with respect to the side edges 195c, 197c on the back body side, and The size is preferably 25% or less with respect to the absorber width. When the depth is 10 mm or less, the material of the absorbent core (pulp / SAP) that wraps the absorbent body 4 (such as tissue or hydrophilic non-woven fabric) wraps away from the second recess 47 so that the absorbent core on the crotch side is deformed. It is transmitted to the deformation of the absorbent core, and each can not be independently deformed. In addition, when the width of the absorbent body is 25% or more, the deformable area of the absorbent core becomes large, and when worn, the absorbent core is deformed so that the edge of the absorbent core is located close to the body. The center of the body will be located at a position farther from the body, causing a loss of fit and a sense of incongruity.

  In addition, the longitudinal dimension of the second recess 47 is equal to or greater than the thickness of the absorber 4, and preferably is equal to or greater than twice the thickness of the absorber 4. Below the thickness of the absorber 4, the absorbent cores before and after the longitudinal direction of the second recess 47 may interfere with each other and prevent independent deformation.

  Moreover, it is preferable that the protruding end portion that protrudes inward in the width direction in the second concave portions 47 and 47 is formed on the back body 22 side from the center in the longitudinal direction of the central absorbent portion 45. When the protruding end portion is formed on the front body 21 side with respect to the center in the longitudinal direction of the central absorbent portion 45, the cavity portion 48 that accommodates defecation etc. is formed on the front body 21 side and can not suitably accommodate defecation etc. There is a case.

  The first narrow portion 100 and the second narrow portion 110 can induce bending so that a predetermined region in the absorber 4 rises in the thickness direction of the absorber 4. Specifically, the first narrow portion 100 is a bending guiding portion that induces bending in the front body side absorption portion 43, and the second narrow portion 110 is a bending that induces bending in the rear body side absorption portion 44. It is a guidance part.

  In particular, the second bending guide part bends the rear body side absorption part 44 so as to rise in the thickness direction, suppresses rear leakage such as defecation, and can accommodate the defecation etc. (see FIG. 7). To form. Here, the cavity 48 is formed in a substantially cup shape by the bent rear body side absorbing portion 44, the central region in the width direction of the central absorbing portion 45, and the convex portion 42 which is a bent side region. Therefore, the structure that contributes to this deformation is also important. For example, when the concave shape in the second concave portion 47 is deep and the radius of curvature at the tip end portion is small (steep curve), the deformation of the convex portions 42 and 42 of the central absorbent portion 45 affects the back body side absorbent portion 44. May be suppressed. Further, the rear body side end portions of the gap portions 41, 41 are positioned on or near the extension of the substantially straight side edges (parts of the side edges 195c, 197c) constituting the second recesses 47, 47. The case where the voids 41 and 41 are formed can also be exemplified.

  Here, the second concave portions 47 and 47 formed at both ends of the second narrow width portion 110 are not only notched, but are substantially U-shaped concave portions such as an absorbent body 500A shown in FIG. May be. Furthermore, not only when the second recesses 47 and 47 are formed at both ends of the second narrow portion 110, but the notches 501 and 503 are substantially V-shaped as in the absorber 500B shown in FIG. 15, for example. It may be the case. As a result, the width between the substantially V-shaped protruding end portion is narrow. Furthermore, the narrow portion can be formed substantially by reducing the amount of the absorbent material disposed at a predetermined opposing position on the side edge of the absorber.

  Here, as the bending guide part that bends the rear body side absorption part 44 so as to rise in the thickness direction, in addition to the above-described second narrow part, for example, an absorbent material that constitutes the absorber 4 from an adjacent region A low-density portion formed by lowering the density, a low-weight portion formed by reducing the basis weight of the material constituting the absorber 4 from an adjacent region, or different absorbers are arranged separately. The separation part formed by this can be illustrated.

  For example, like the absorbent body 500C shown in FIG. 16, in the front body side absorption part 511 and the back body side absorption part 513, the density of the material which comprises the absorber 4 is made high, and the front body side absorption part 511 and back body side are increased. By reducing the density of the material in the region 510 between the side absorption part 513, the bending induction part can be formed.

  For example, a gas having a predetermined strength is blown into a region 520 between the front body side absorption part 521 and the back body side absorption part 523 as in the absorber 500D shown in FIG. 17 (A) or (B). Thus, an area where the material constituting the absorber 4 is low (low-weight area) is formed, and a high-density area where the material density is high is formed on both sides of the low-weight area, thereby forming a bending induction portion. Can do.

  Like the absorber 500F shown in FIG. 18, the first absorbent body 551 disposed on the front body side and the second absorbent body 552 disposed on the back body side are spaced apart by a predetermined interval, The region 550 between the first absorbent body and the second absorbent body can be formed as a bending guide portion that is a separated region where no absorbent body exists.

[1.3.3] Various gathers and elastic members As shown in FIG. 2 or FIG. 3, the disposable diaper 1 in the present embodiment is disposed in the vicinity of both side edges in the width direction of the absorbent body 4 so as to be along the longitudinal direction. The elastic member 61 which is a pair of 1st elastic members is provided. The elastic member 61 is disposed along the longitudinal direction of the leak-proof wall 6 on the leak-proof sheet 62. As shown in FIG. 2, both ends of the elastic member 61 in the longitudinal direction are arranged in the vicinity of the front edge 191 and the rear edge 193 in the longitudinal direction of the absorber 4. The leak-proof wall 6 arranged in this way contributes to deforming the absorber 4 into a substantially U shape as shown in FIG.

  As shown in FIG. 1 or FIG. 2, a plurality of elastic members 26, which are a plurality of third elastic members, are arranged on all or part of the chassis 2 so as to extend in the width direction. The plurality of elastic members 26 are thread-like or belt-like, and the plurality of elastic members 26 are arranged substantially parallel to each other at a predetermined interval in the longitudinal direction. And the elastic member 26 arrange | positioned at all or a part of the back body 22 prevents the disposable diaper 1 from sliding down, etc., and at least places the back body 22 (the waistline region at the time of wearing) on the body side of the wearer. Press. Thereby, the back body side absorption part 44 is pressed on a wearer's body, and as a result, the back body 22 is maintained in the state along the line (shape) of a wearer's body. That is, since it will be in the state expanded in the width direction of this back body side absorption part 44, entering into a width | variety is suppressed. The entire absorbent body 4 can be deformed in a state where the width of the rear body side absorbent portion 44 is suppressed.

  As shown in FIG. 1 or 2, the disposable diaper 1 is formed on the side facing the body opening 8 and the body opening 8 formed by the front edge 91 and the rear edge 93 in the longitudinal direction at least at the time of wearing. 2 and a pair of leg openings 7 and 7 formed by side edges 95 and 97 in the width direction. And the elastic member 72 which is a 2nd expansion-contraction member arrange | positioned along the side edges 95a and 97a which form the leg opening 7 in the back body 22 is provided. The elastic member 72 constitutes a leg gather 71. The elastic member 72, which is the second elastic member, extends along the side edges 95a and 97a constituting a part of the concave part 205 from a predetermined position of the joint parts 24b and 24b that are part of the side edges of the back body 22. Placed in. And the edge part located in the longitudinal direction inner side (it is also inner side of the width direction) of the absorber 4 in the elastic members 72 and 72 which are 2nd expansion-contraction members is arrange | positioned in the vicinity of the 2nd narrow part 110. FIG.

  The elastic member 72 is different from the present embodiment, for example, when formed continuously from the front body 21 to the back body 22 (for example, when arranged so as to cross each other, or the same in the center line C) In the case where each side is arranged so as to extend in the longitudinal direction, at least a part of the second elastic member is arranged in the vicinity of the second narrow part.

  Here, when the end portions (a part) of the elastic members 72 and 72 that are the second elastic members are arranged in the vicinity of the second narrow portion 110 and on the rear edge 193 side in the longitudinal direction. For example, the rear body side absorption portion 44 is mounted without entering the width along the wearer's body.

  Further, as shown in FIG. 9, when the end portions (a part) of the elastic members 72, 72 are arranged in the vicinity of the second narrow portion 110 and on the center side in the longitudinal direction of the absorber 4. For example, the central absorbent portion 45 is worn (attached) in a state of being spread in the width direction of the absorbent body 4 along the wearer's body. That is, it may be possible to make the cavity 48 for accommodating defecation and the like larger so that defecation can be accommodated appropriately.

  Further, when worn, the absorbent core corresponding to the crotch region has the side edges 195 and 197 more easily in the body direction (thickness in the absorber 4) due to the leak-proof wall 6 (elastic member 61) and the gaps 41 and 41. Bending and deforming so as to rise in the vertical direction), a cavity 48 as shown in FIG. 7 is formed. A triangular pyramid-shaped space is formed. Furthermore, in the disposable diaper 1 configured as described above, since the gap portions 41 and 41 symmetrical to the center line C are formed in the width direction, the center in the width direction of the central absorbent portion 45 is the center of the wearer's body. In some cases, it can be reliably arranged. That is, since the cavity 48 formed by the deformation of the absorbent body 4 is disposed at the center of the wearer's body when the disposable diaper 1 is worn, defecation and the like can be more reliably accommodated. Thereby, the leakage of defecation or the like may be significantly reduced.

[1.3.4] Usage Mode As shown in FIG. 7, in the mounted state, the absorbent body 4 is deformed into a U shape in the longitudinal direction, and the back body side absorbent portion 44 bends the second narrow portion 110. The line is bent so as to rise in the thickness direction of the absorber 4.

  Further, as shown in FIG. 5 or FIG. 6, each of the convex portions 42 and 42 in the lateral region disposed on the outer side in the width direction in the central absorption portion 45 is bent so as to rise in the thickness direction. Specifically, in the state shown in FIG. 6A, when a force is applied from the outside in the width direction to the inside as shown by the arrows, the convex portions 42 and 42 are respectively formed as shown in FIG. 6B. Bend to stand up. And as shown in FIG.6 (C), also in this deformation | transformation state, a thin cup-shaped accommodating part is formed in the absorber 4 whole.

  After the bending deformation, as shown in FIG. 7 or 8, the bent back body side absorbing portion 44, the central region in the width direction of the central absorbing portion 45, and the convex portion 42 that is a bent side region, Thus, a predetermined cavity 48 is formed.

  The bent rear body side absorbing portion 44, the central region in the width direction of the central absorbing portion 45, and the convex portion 42, which is a bent side region, are formed in a substantially cup shape, contributing to this deformation. The structure to be important is also important. For example, when the concave shape in the second concave portion 47 is deep and the radius of curvature at the tip end portion is small (steep curve), the deformation of the convex portions 42 and 42 of the central absorbent portion 45 affects the back body side absorbent portion 44. In some cases, this can be suppressed. Further, the rear body side end portions of the gap portions 41, 41 are positioned on or near the extension of the substantially straight side edges (parts of the side edges 195c, 197c) constituting the second recesses 47, 47. The case where the voids 41 and 41 are formed can also be exemplified.

  In addition, as shown in FIGS. 6A to 6D, when the disposable diaper 1 is worn, when the compressive force is received from the wearer's thigh in the direction of the arrow, the leg gather 71 (elastic member 72) is pulled. Even when the convex portions 42 and 42 are deformed so as to rise to the skin contact surface side of the wearer due to stress or the like, the front body side absorbent portion 43 and the back body are not affected by the deformation of the convex portions 42 and 42. The side absorbing portion 44 can be deformed in a curved state along the wearer's body. The line connecting each of the pair of second recesses 47, 47 formed in the notch shape and the line connecting each of the pair of first recesses 46, 46 are the front body side absorption part 43 and the back body side of the absorber 4. This is because it can be a fold starting point when the absorbing portion 44 is deformed.

  Thus, while the front body side absorption part 43 and the back body side absorption part 44 deform | transform into a curved shape along the shape of a wearer's body, in the width direction of the absorber 4, convex-shaped parts 42 and 42 are provided. By deforming so as to rise toward the skin contact surface side, the disposable diaper 1 can form a cavity 48 as shown in FIG. Moreover, this makes it possible to provide the disposable diaper 1 that can suppress leakage of defecation and the like without causing the wearer to feel uncomfortable.

[2] Second Embodiment A pants-type disposable diaper 1A according to a second embodiment of the present invention will be described with reference to FIGS. 1 A of disposable diapers in this embodiment are disposable diapers from which only the absorber 4 in the disposable diaper 1 in 1st Embodiment differs. In the present embodiment, an absorbent body 4A having a shape different from that of the absorbent body 4 of the first embodiment will be mainly described.

  The absorbent body 4A in the present embodiment includes a central absorbent portion 45A, a back body side absorbent portion 44A, and a second narrow portion 110A formed between the central absorbent portion 45A and the back body side absorbent portion 44A. Prepare. The absorber 4A is formed only with the second narrow portion 110A that is a bending guiding portion that bends the rear body side absorbing portion 44 so as to rise in the thickness direction. Second recesses 47A and 47A are formed at both ends of the second narrow portion 110A.

  110 A of 2nd narrow parts guide | invade that the back body side absorption part 44A stands | starts up so that it may stand up in the thickness direction, for example, as shown in FIG.5 (B) and FIG. When the absorbent body 4A is deformed into a U shape when worn (mounted) or the like, the rear body side absorbent portion 44A is suitably bent and deformed.

  The second narrow portion 110A, which is a bending guide portion, bends and deforms so that the back body side absorption portion 44A rises in the thickness direction, thereby suppressing leakage of defecation and the like.

  In this embodiment, although the aspect which formed the narrow part as a bending induction part was demonstrated, naturally the other bending induction part illustrated in 1st Embodiment is applicable.

[3] Third Embodiment With reference to FIG. 13, an open-type disposable diaper 1B according to a third embodiment of the present invention will be described. The disposable diaper 1B in the present embodiment is a disposable diaper in which only the chassis 2 in the disposable diaper 1 in the first embodiment is different. In the present embodiment, the absorber 4 of the chassis 2B having a shape different from that of the chassis 2 of the first embodiment will be mainly described.

  The chassis 2B in the present embodiment is substantially vertically long, and the absorber 4 is arranged along the longitudinal direction in the central region in the width direction. An elastic member 720 is disposed on the rear edge side on the side where the rear body side absorbent portion of the absorbent body 4 is disposed in the longitudinal direction. The elastic member 720 is disposed so as to be stretchable in the width direction of the chassis 2B. And a pair of latching | locking parts 711 and 711 are arrange | positioned on the width direction outer side of the elastic member of the elastic member 720. FIG.

  A locked member 710 is disposed on the front edge side of the absorbent body 4 in the longitudinal direction where the front body side absorbent portion is disposed. The locked member 710 is disposed on the surface opposite to the absorber 4 in the thickness direction of the chassis 2B.

  In order to wear the open-type disposable diaper 1B, the front edge and the rear edge are attached so as to form a trunk opening, and the locking portions 711 and 711 are overlapped on the outer surface of the locked member 710. To do. Thereby, both side edges of the chassis 2B also form a pair of leg openings and are attached.

  Deformation such as bending of the absorbent body 4 in the open-type disposable diaper 1B is as described in the second embodiment. Also in the open-type chassis 2B in the present embodiment, the absorber 4 can be bent and deformed to form a hollow portion that can accommodate, for example, defecation.

[4] Each component Each component of the disposable diaper will be described below.

[4.1] Chassis The chassis 2 constitutes the outer shape of the disposable diaper 1. The chassis 2 may be constituted by a single sheet-like member, or may be constituted by bonding a plurality of sheet-like members. In the present embodiment, the disposable diaper 1 includes a chassis 2 having a front body 21 and a back body 22, and a crotch portion 23 positioned between the front body 21 and the back body 22, and the chassis 2 The top sheet 3, the absorber 4 and the back sheet 5 are joined to the predetermined position via the crotch portion 23, but the present invention is not limited to this. For example, the chassis 2 has a front body 21, a back body 22, and a crotch portion 23 positioned between the front body 21 and the back body 22, and the front sheet 3, the absorber 4, and the back sheet are disposed at predetermined positions of the chassis 2. 5 may be arranged. For example, the chassis 2 may have the front body 21 and the back body 22, and the crotch part 23 which has the surface sheet 3, the absorber 4, and the back surface sheet 5 may be joined to the chassis 2 independently. In this case, the back sheet 5 and the chassis 2 in the crotch part 23 may be joined, or the back sheet 5 may have the role of the chassis 2.

The chassis 2 is preferably a material that is breathable, has a strength that does not break even when subjected to a load caused by compression, twisting, friction, etc. during wearing, and does not irritate the skin. A sheet-like material having air permeability such as a plastic sheet can be used. Examples of the nonwoven fabric include those obtained by forming synthetic fibers such as polyolefins and polyesters by point bonds, air throughs, spun bonds, and the like. The material of the nonwoven fabric, for example, natural fibers, mainly of chemical fiber can be exemplified by material weight per unit area is obtained from the range of 15 g / ^{m 2} of 35 g / ^{m 2.} Examples of natural fibers include cellulose such as cotton. Examples of the chemical fiber include semi-synthetic cellulose such as rayon, regenerated cellulose, acetate, and triacetate, thermoplastic hydrophobic chemical fiber, and thermoplastic hydrophobic chemical fiber subjected to a hydrophilic treatment. Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene (PE) and polypropylene (PP), and core sheaths. Examples include composite fibers such as structures.

  Examples of the porous plastic sheet include a porous sheet made of a thermoplastic resin such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), and a porous foam material.

[4.2] Surface sheet The surface sheet 3 is arranged on the body side and in contact with the excretion part during use. The entire surface of the surface sheet 3 may be liquid permeable, or a part thereof may be liquid permeable. Moreover, it may be comprised by the sheet-like member of 1 sheet, and the some sheet-like member may be adhere | attached and comprised.

As the top sheet 3, for example, a material that has a strength that does not break even when a load due to compression, twisting, friction or the like is applied during wearing and that does not irritate the skin is preferable. For example, a sheet-like material having liquid permeability can be used. Examples of the non-woven fabric include those obtained by subjecting a hydrophobic fiber such as polyolefin-based or polyester-based hydrophobic treatment to a manufacturing method such as point bond, air-through, and spun bond. Moreover, as a material of a nonwoven fabric, the material obtained from the range of 15 g / m < ² > to 35 g / m < ² > mainly having a natural fiber and a chemical fiber can be illustrated, for example. Examples of natural fibers include cellulose such as cotton. Examples of the chemical fiber include semi-synthetic cellulose such as rayon, regenerated cellulose, acetate, and triacetate, thermoplastic hydrophobic chemical fiber, and thermoplastic hydrophobic chemical fiber subjected to a hydrophilic treatment. Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene (PE) and polypropylene (PP), and core sheaths. Examples include composite fibers such as structures.

  Examples of the porous plastic sheet include a porous sheet made of a thermoplastic resin such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), and a porous foam material.

[4.3] Absorber The absorber 4 absorbs and holds discharged body fluid such as urine. The absorbent body 4 has, for example, a structure in which a superabsorbent polymer and a hydrophilic fiber are mixed and laminated, or a structure in which the superabsorbent polymer is fixed to a hydrophilic sheet with a hot melt adhesive or the like. May be. In addition, examples of the superabsorbent polymer include polyacrylate-based and starch / acrylate-based absorptive polymers having a water absorption capacity of 20 g / g or more and a particle size of 100 to 800 μm. The thing which occupies 80% or more can be illustrated. Examples of hydrophilic fibers include pulverized pulp fibers and rayon fibers. Examples of the hydrophilic sheet include non-woven fabrics (weight per unit area: 15 to 35 g / m ² ) such as point bonds, air-throughs, and spun bonds formed by subjecting hydrophobic fibers such as polyolefins and polyesters to a hydrophilic treatment. Examples of hot melt adhesives include SBS (styrene-butadiene-styrene copolymer), SIS (styrene-isobutylene-styrene copolymer), SEBS (styrene-ethylene-butylene-styrene copolymer), and SEPS (styrene-ethylene). -Propylene-styrene copolymer), APAO (Amorphous Poly Alpha Orefin) and the like as a base polymer can be exemplified.

[4.4] Back Sheet As the back sheet 5, for example, a thermoplastic film mainly composed of polyethylene (PE), polypropylene (PP), a breathable resin film, a nonwoven fabric such as spunbond or spunlace, and the like is breathable. A plurality of resin films bonded together, SMS (spunbond / meltblown / spunbond) multiple layers, and the like can be used. Preferably, for example, a resin film mainly composed of a polyolefin resin and having a basis weight in the range of 10 g / m ² to 30 g / m ² is preferable.

[4.5] Elastic Member As the elastic member 26, for example, natural rubber or synthetic rubber such as styrene-butadiene, butadiene, or isoprene can be used. The sheet-like elastic member 26 is formed of, for example, a foamed polyurethane having a basis weight of 30 g / m ² to 80 g / m ² and a mixed fiber of polyurethane and polypropylene having a basis weight of 20 g / m ² to 70 g / m ^2. A non-woven fabric can be used.

[4.6] Adhesive The topsheet 3 and the absorber 4 and the chassis 2 are joined together by being bonded together with a hot melt adhesive. Moreover, the surface sheet 3 and the absorber 4 are joined so as to be bonded by a hot melt adhesive. In addition, joining is not restricted to the said hot melt adhesion, For example, you may use a heat seal, an ultrasonic seal, etc. individually or in combination.

Examples of hot melt adhesives include SBS (styrene-butadiene-styrene copolymer), SIS (styrene-isobutylene-styrene copolymer), SEBS (styrene-ethylene-butylene-styrene copolymer), and SEPS (styrene-ethylene). -Propylene-styrene copolymer), APAO (Amorphous Poly Alpha Orefin) and the like as a base polymer can be exemplified. Examples of the coating pattern when bonded by hot melt bonding include spiral coating, control seam coating, coater coating, curtain coater coating, and summit gun coating. The basis weight of the adhesive in hot melt bonding is preferably 1 g / m ² to 30 g / m ^{2, and} more preferably 3 g / m ² to 10 g / m ² . In the case of a pattern in which the adhesive is coated in a linear shape, the wire diameter is preferably 30 μm to 300 μm.

It is a perspective view of the disposable diaper which concerns on embodiment of this invention. It is an expanded view which shows the state which expand | deployed the disposable diaper which concerns on embodiment of this invention. It is XX sectional drawing of FIG. 1 is an exploded view of a disposable diaper according to an embodiment of the present invention. It is a figure which shows the absorber of the disposable diaper which concerns on embodiment of invention. It is a figure which shows the deformation | transformation state of an absorber. It is a perspective view which shows the absorber after a deformation | transformation. It is a figure explaining the state of the absorber at the time of mounting | wearing. It is an expanded view which shows the state which expand | deployed the disposable diaper which concerns on the modification of 1st Embodiment. It is an expanded view which shows the state which expand | deployed the disposable diaper which concerns on 2nd Embodiment. (A) is a front view of the absorber in the disposable diaper which concerns on 2nd Embodiment, (B) is a perspective view which shows the absorber after a deformation | transformation. It is a figure explaining the state of the absorber at the time of mounting | wearing. It is an expanded view which shows the state which expand | deployed the disposable diaper which concerns on 3rd Embodiment. It is a top view which shows the deformation | transformation form of an absorber. It is a top view which shows the deformation | transformation form of an absorber. It is a top view which shows the deformation | transformation form of an absorber. (A) is a top view which shows the deformation | transformation form of an absorber. (B) is a YY sectional view of (A). It is a top view which shows the deformation | transformation form of an absorber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Chassis 3 Top sheet 4 Absorber 5 Back sheet 6 Leak-proof wall 7 Leg opening 8 Trunk opening 21 Front body 22 Rear body 23 Crotch part 41 Cavity part 42 Convex part 46 1st recessed part 47 2nd recessed part 100 1st 1 narrow part 110 second narrow part

Claims (9)

A chassis having at least a front body and a back body, and having a width direction and a longitudinal direction perpendicular to the width direction;
A disposable diaper comprising at least a longitudinally-shaped absorbent body disposed along the longitudinal direction from a predetermined position in the front body to a predetermined position in the back body,
The absorber is
A front body side absorbent part mainly disposed on the front body side;
A back body side absorbent portion mainly disposed on the back body side;
A central absorbent part formed between the front body side absorbent part and the back body side absorbent part;
A first narrow part formed between the front body side absorbent part and the central absorbent part and / or a second narrow part formed between the rear body side absorbent part and the central absorbent part; With
The central absorbent portion is
A pair of convex portions respectively protruding outward in the width direction;
A pair of voids formed along the longitudinal direction on both sides of a center line that bisects the central absorbent portion in the width direction;
The gap is
A linear starting point portion extending along the longitudinal direction of the central absorbent portion;
A curved portion that is located on the outer side in the width direction than the starting point portion and protrudes on the outer side in the width direction of the central absorbent portion, and is formed in a shape surrounded by the starting point portion and the curved portion,
The curved part is a disposable diaper formed so as to draw an arc substantially parallel to the side edge of the convex part.   The disposable diaper according to claim 1, wherein a notch-shaped recess formed at a side edge in the width direction of the absorber is formed on both sides of the second narrow portion. The concave portion is formed by a side edge in the back body side absorbent portion and a side edge in the central absorbent portion,
The side edge of the back body side absorbing portion forming the concave portion is substantially straight,
The disposable diaper according to claim 2, wherein the gap portion is formed such that an end portion on the back body side in the gap portion is located on or near an extension line on a side edge of the back body side absorption portion. A pair of first stretchable members arranged along the longitudinal direction in the vicinity of both side edges in the width direction of the absorber;
The disposable diaper according to any one of claims 1 to 3, wherein both ends of the first stretchable member in the longitudinal direction are disposed in the vicinity of the front edge and the rear edge in the longitudinal direction of the absorber. A third elastic member disposed in the back body;
The disposable diaper according to any one of claims 1 to 4, wherein the third elastic member is disposed so as to extend in the width direction. At least when mounted, a pair of trunk openings formed by a front edge and a rear edge in the longitudinal direction of the chassis and a side edge in the width direction of the chassis formed on a side facing the trunk opening. Leg openings, and
A second elastic member disposed along the side edges to form the leg openings in the back body,
The disposable diaper according to any one of claims 1 to 5, wherein at least a part of the second elastic member is disposed in the vicinity of the second narrow portion. In the wearing state,
The back body side absorption part is bent so as to rise in the thickness direction of the absorber with the second narrow part as a bending line,
The central absorbent portion is bent such that lateral regions on the outer side in the width direction rise in the thickness direction,
The disposable diaper according to any one of claims 1 to 6, wherein a predetermined hollow portion is formed by the bent rear body side absorbent portion, the central region in the width direction of the central absorbent portion, and the bent lateral region. .   The disposable diaper according to claim 7, wherein the side region is a region outside the width direction in the gap. An absorbent body for a disposable diaper used in a disposable diaper comprising a chassis having at least a front body and a back body,
A front body side absorbent part mainly disposed on the front body side;
A back body side absorbent portion mainly disposed on the back body side;
A central absorbent part formed between the front body side absorbent part and the back body side absorbent part;
A first narrow part formed between the front body side absorbent part and the central absorbent part and / or a second narrow part formed between the rear body side absorbent part and the central absorbent part; ,
With
The central absorbent portion is
A pair of convex portions respectively protruding outward in the width direction;
A pair of voids formed along the longitudinal direction on both sides of a center line that bisects the central absorbent portion in the width direction;
The gap is
A linear starting point portion extending along the longitudinal direction of the central absorbent portion;
A curved portion that is located on the outer side in the width direction than the starting point portion and protrudes on the outer side in the width direction of the central absorbent portion, and is formed in a shape surrounded by the starting point portion and the curved portion,
The said curved part is an absorbent body for disposable diapers formed so that the circular arc substantially parallel to the side edge of the said convex-shaped part may be drawn.

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