JP2018079058A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper in which wrinkles hardly occur on an absorber arranged on a crotch area, and in which preferable fitness on a pair of leg opening parts can be maintained.SOLUTION: In an expanded and stretched state of a diaper 1, a pair of leg gatherings 80, 80 are formed by an abdominal side leg elastic member 81a and a back side leg elastic member 81b arranged along respective opening peripheral edge parts of a pair of leg opening parts 8, 8. The abdominal side leg elastic member 81a and the back side leg elastic member 81b cross on a side closer to an abdominal area A side than to a lateral center line Yc which divides the diaper 1 into half in a vertical direction Z, and are fixed to an exterior body 10 by an adhesive in inside of the lateral direction Y relative to the crossing part. On a center part of the crotch area C, the back side leg elastic member 81b is arranged so that an angle α formed by the back side leg elastic member 81b and both side edges 46, 46 along the vertical direction X of the absorber 4 becomes 30 degree or more and 90 degree or less.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, an abdominal region disposed on the wearer's ventral side, a crotch region disposed on the wearer's crotch region, and an hourglass-shaped exterior body covering the dorsal region disposed on the wearer's back side, and the exterior An absorptive main body fixed to the inner surface side of the body, and both side edges of the exterior body on the abdominal side and both side edges of the exterior body on the back side are joined together to form a pair of side seal portions and a waist opening A pants-type disposable diaper in which a part and a pair of leg openings are formed is known.

  In such a pants-type disposable diaper, an elastic member is fixed in an expanded state to the ventral region, the dorsal region, and the crotch region of the exterior body to form a gather, thereby improving the fit to the body. For example, each leg elastic member is arranged along each opening peripheral part of a pair of leg openings, and a pair of leg gathers are formed by fixing the leg elastic members in an extended state to fit around both legs. (See, for example, Patent Document 1).

JP 2010-194257 A

  However, the pants-type disposable diaper described in Patent Document 1 has the leg elastic members disposed along the peripheral edge portions of the pair of leg openings, so The wrinkles in the lateral direction are generated in the absorber disposed in the section. When lateral wrinkles occur in the absorbent body, the thickness of the absorbent body and the hardness when touching the absorbent body are increased, or the appearance is deteriorated.

  Therefore, the subject of this invention is providing the underpants type disposable diaper which can eliminate the fault which the prior art mentioned above has.

  The present invention has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction orthogonal thereto, and is provided with a ventral region disposed on the wearer's ventral side, a crotch region disposed on the crotch region, and a spine. An exterior body over the back region disposed on the side, and an absorbent main body having an absorbent body fixed to the skin-facing surface side of the exterior body, and both side edges of the exterior body in the ventral region A pair of legged disposable diapers in which a pair of side seal parts, a waist opening part, and a pair of leg opening parts are formed by joining both side edges of the exterior body in the back region. A pair of leg gathers is formed by a ventral leg elastic member and a dorsal leg elastic member arranged along the opening peripheral edge of each opening, and the ventral side in the expanded and extended state of the pant-type disposable diaper Leg elastic member It is arranged in an extended state along the one leg opening from the ventral region side of the outer packaging body, and is arranged in an extended state inward in the lateral direction at the longitudinal center of the crotch region, Furthermore, it is arranged in an extended state from the ventral region side of the exterior body along the other leg opening, and in an extended state inward in the lateral direction at the central portion of the crotch region. The dorsal leg elastic member is arranged in an extended state along one leg opening from the dorsal region side of the exterior body and inward in the lateral direction at the central portion of the crotch region. Furthermore, it is arranged in an extended state from the dorsal region side of the exterior body along the other leg opening, and inward in the lateral direction at the central portion of the crotch region. It is arranged in an extended state toward the ventral side The leg elastic member and the dorsal leg elastic member intersect at the ventral region side from a lateral center line extending in a lateral direction that bisects the disposable diaper in the central portion of the crotch region. , Both sides of the back leg elastic member and the absorbent body along the longitudinal direction at the center portion of the crotch region, which are fixed to the exterior body by an adhesive inward in the lateral direction from the intersecting portion The present invention provides a pants-type disposable diaper in which the angle between each edge is 30 degrees or more and 90 degrees or less.

  According to the pants-type disposable diaper of the present invention, it is difficult to generate wrinkles on the absorbent body arranged in the crotch region, and good fit can be maintained.

FIG. 1 is a perspective view showing a disposable diaper which is a preferred embodiment of the present invention. FIG. 2 is a plan view of the deployed and extended state of the disposable diaper shown in FIG. 1 as viewed from the skin facing surface side. Fig.3 (a) is a figure which shows the angle which the back side leg elastic member and the side edge along the vertical direction of an absorber make, and FIG.3 (b) is the vertical direction of a ventral leg elastic member and an absorber. It is a figure which shows the angle which the side edge in alignment with makes. 4 is a cross-sectional view taken along line IV-IV in FIG.

Hereinafter, the underpants type disposable diaper of this invention is demonstrated, referring drawings based on the preferable embodiment.
As shown in FIGS. 1 and 2, a pants-type disposable diaper 1 (hereinafter also referred to as diaper 1) that is an embodiment of the present invention is a vertical direction X corresponding to the wearer's front-rear direction and a horizontal direction orthogonal thereto. An exterior body 10 having a direction Y and extending over the abdomen region A disposed on the wearer's abdomen, the crotch region C disposed in the crotch region, and the dorsal region B disposed on the back side; And an absorbent main body 5 having an absorbent body 4 fixed to the skin facing surface side of the exterior body 10. Further, the diaper 1 is joined to both side edges AS, AS of the exterior body 10 in the ventral region A and both side edges BS, BS of the exterior body 10 in the back region B, and a pair of side seal portions S, S, a waist opening 7 and a pair of leg openings 8, 8 are formed.

  The longitudinal direction (X direction in FIG. 2) of the diaper 1 is a direction from the ventral region A through the crotch region C to the dorsal region B or the opposite direction, as shown in FIGS. The lateral direction (Y direction in FIG. 2) is a direction from one side seal portion S to the other side seal portion S or the opposite direction. Further, as shown in FIGS. 1 and 2, the ventral region A and the back region B of the diaper 1 are provided with a pair of side seal portions S and S at both ends in the lateral direction (Y direction in FIG. 2) of the diaper 1. The crotch region C is a portion located between the ventral region A and the dorsal region B when the diaper 1 is deployed and extended. Further, in the present specification, the “deployed and extended state of the diaper 1” means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the elastic member of each part is expanded in the expanded diaper 1 to design dimensions (elasticity). It means a state where it has been expanded until it becomes the same size as when it was expanded in a flat shape with no influence of the member.

  As shown in FIGS. 1 and 2, the outer package 10 includes an outer layer sheet 11 that is the outermost surface of the diaper 1, an inner layer sheet 12 that is disposed on the inner surface side of the outer layer sheet 11, And an elastic member fixed in an extended state between the sheets 11 and 12. The exterior body 10 extends over the entire outer side of the absorbent main body 5, and is constricted 10 d, which is constricted inward in the lateral direction Y at the center in the longitudinal direction X, on both side edges along the longitudinal direction X. 10d. The constricted portions 10d and 10d are formed by a pair of leg openings when the side edges AS and AS of the ventral region A of the exterior body 10 and the side edges BS and BS of the back region B are overlapped and joined to each other. This is a part that becomes parts 8 and 8. The elastic member forms a gather by being fixed to the exterior body 10 in an extended state. The elastic member provided in the exterior body 10 will be described in detail later.

  As shown in FIG. 2, the absorbent main body 5 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a vertically long absorber disposed therebetween. 4 is provided. The absorbent body 4 is configured by covering a long absorbent core 40 in the longitudinal direction X with a core wrap sheet 45.

  In the diaper 1, the absorbent core 40 has a high basis weight portion 41 extending in the longitudinal direction X at the center portion in the lateral direction Y in the crotch region C in the expanded and expanded state of the diaper 1 shown in FIG. The grammage portion 41 has a pair of low grammage portions 42, 42 that are arranged outward on both sides along the longitudinal direction X and have a lower grammage than the high grammage portion 41. Further, as shown in FIG. 4, the absorbent core 40 is formed in a two-layer structure including an upper absorbent layer 411 and a lower absorbent layer 412 having a longer length in the vertical direction X and the horizontal direction Y than the upper absorbent layer 411. Has been. In the absorbent core 40, the upper absorbent layer 411 is laminated on the skin facing surface of the lower absorbent layer 412, and the portion where the lower absorbent layer 412 and the upper absorbent layer 411 overlap is the high basis weight portion 41. The upper absorbent layer 411 is not laminated on the skin facing surface, and only the lower absorbent layer 412 is a low basis weight portion 42.

  In the diaper 1, the upper absorbent layer 411 is disposed from the crotch region C to the ventral region A of the diaper 1 and is disposed in the back region B of the diaper 1 shown in FIG. Not. The upper absorbent layer 411 has a width increasing (gradually increasing) from the vicinity of the central portion in the longitudinal direction X of the crotch region C toward the ventral region A, and the ventral region A side is wider than the crotch region C. It is formed in a substantially T shape in plan view. The tip of the upper absorbent layer 411 on the ventral region A side extends to a waistline portion D (described later) in the ventral region A. The lower absorbent layer 412 is arranged from the ventral region A through the crotch region C to the back region B, and is formed in a rectangular shape that is long in the vertical direction X. The lower absorbent layer 412 has both end portions in the longitudinal direction X extending between waist portions D (described later) of the ventral region A and the back region B, respectively.

  In the diaper 1, the lower absorbent layer 412 has a side non-stacking portion 44 that penetrates the lower absorbent layer 412 in the expanded and extended state of the diaper 1 shown in FIG. 2. The side non-stacking portions 44 are formed on both side portions in the lateral direction Y of the lower absorbent layer 412. In other words, the side non-stacking portions 44 are formed on both side portions along the longitudinal direction X of the lower absorbent layer 412. That is, in the diaper 1, a pair of side portion non-stacked portions is formed in the lower absorbent layer 412. The pair of side portion non-stacking portions 44, 44 are formed only on the lower absorbent layer 412 without the upper absorbent layer 411 being laminated on the skin facing surface of the lower absorbent layer 412. More specifically, the pair of side non-stacking portions 44, 44 extends in the longitudinal direction X from the both side edges along the side edges along the longitudinal direction X of the upper absorbent layer 411 to the lower outer absorbent layer 412 laterally outward. It is extended and formed. By providing the pair of side non-stacking portions 44, 44 in the lower absorbent layer 412, when stress is generated in the crotch region C from the outside in the lateral direction Y to the inside, the longitudinal direction of the lower absorbent layer 412 is increased. Flexibility of both sides along the direction X can be improved.

  Moreover, a pair of side part non-stacking parts 44 and 44 are the inner ends of the crotch region C side of the pair of side seal portions S and S on the ventral region A side when the diaper 1 shown in FIG. A virtual ventral inward line Ya connecting Sa and Sa and a virtual dorsal inner side connecting a pair of side seal portions S and S on the back side region B side and inner ends Sb and Sb on the crotch region C side It extends in the vertical direction X with respect to the direction line Yb. The pair of side non-stacking portions 44, 44 are arranged symmetrically with respect to the longitudinal center line Xc extending in the longitudinal direction X that bisects the diaper 1 in the lateral direction Y, and the diaper 1 is in the expanded and extended state. The diaper 1 is preferably provided at a substantially central portion in the longitudinal direction X across a lateral center line Yc described later.

In addition, from a viewpoint of improving the flexibility of the absorptive core 40 in the lateral direction Y, the pair of side part non-stacking parts 44, 44 are arranged in the diaper 1 as shown in FIG. However, the amount of the core forming material in an amount smaller than that of the low basis weight portion 42 is slightly present at about 20 g / m ² , for example. Even if it is, it can be included in the non-stacked fiber portion because the same effect can be obtained. However, it is preferable that the basis weight of the core forming material existing in the non-stacked side portion is 50 g / m ² or less.

  In the diaper 1, the absorbent core 40 is entirely covered with a core wrap sheet 45 in the upper absorbent layer 411 and the lower absorbent layer 412 as shown in FIG. 4. As the core wrap sheet 45, various known ones can be used. For example, thin paper such as tissue paper or water-permeable nonwoven fabric is preferably used. The absorbent core 40 may be formed by coating the upper absorbent layer 411 and the lower absorbent layer 412 separately with the core wrap sheet 45 and then laminating them. In this case, the core wrap sheet 45 covering the upper absorbent layer 411 and the core wrap sheet 45 covering the lower absorbent layer 412 may or may not be bonded.

  On both sides of the absorbent main body 5, a pair of leak-proof cuffs 55, 55 are formed in the diaper 1 in the expanded and extended state of the diaper 1 shown in FIG. 2. Each leak-proof cuff 55 includes a leak-proof cuff forming sheet 56 joined to the absorbent main body 5 and an elastic member for forming a leak-proof cuff fixed in the vicinity of the free end of the leak-proof cuff forming sheet 56. 57 and a leak-proof cuff intermediate elastic member 58 fixed in an extended state between a fixed end and a free end of each leak-proof cuff 55. In the example shown in FIG. 4, one sheet of a band-shaped water-repellent sheet having a predetermined width is folded in half along the longitudinal direction as the leak-proof cuff forming sheet 56, and the opposite layers are hot-melt adhesive. Or the sheet | seat of the 2 layer structure joined by the partial heat seal or the ultrasonic seal | sticker etc. is used. The elastic member 57 and the leak-proof cuff intermediate elastic member 58 described above are fixed in an expanded state between the layers of the two-layer structure sheet.

  As shown in FIG. 4, the surface sheet 2 covering the absorbent body 4 is wound down to the exterior body 10 side (non-skin facing surface side) at both side portions along the longitudinal direction X of the absorbent body 4. The formed portions cover both side portions along the longitudinal direction X of the absorber 4. By rolling down and covering the both side portions along the longitudinal direction X of the absorbent body 4, good uprightness toward the skin facing surface side of the both side portions of the absorbent body 4 can be obtained. Note that the standing property means the ease of standing. In the diaper 1, the top sheet 2 is configured such that both side end portions 21, 21 along the longitudinal direction X wound down on both side portions of the absorbent body 4 are on the non-skin facing surface side of the absorbent body 4. The cuff forming sheet 56 is bonded and fixed by a bonding means such as heat seal or adhesive.

  As described above, the exterior body 10 that fixes the absorbent main body 5 extends over the ventral region A, the crotch region C, and the dorsal region B when the diaper 1 shown in FIG. The exterior body 10 includes an outer layer sheet 11, an inner layer sheet 12, and one or a plurality of (in this embodiment, a plurality of) elastic members that form a gather in each region. Hereinafter, the elastic member which the exterior body 10 has is demonstrated.

  As shown in FIG. 1, the exterior body 10 includes one or a plurality (in this embodiment, a plurality) of waist elastic members 71 arranged along the waist opening 7, as shown in FIG. A waist gather 70 is formed by the waist elastic member 71. The waist elastic member 71 extends in the lateral direction Y from one side seal portion S to the other side seal portion S of each of the ventral region A and the dorsal region B in the expanded and extended state of the diaper 1 shown in FIG. It is being fixed to the exterior body 10 in the expansion | extension state. Then, by joining one side seal portion S and the other side seal portion S of each of the ventral region A and the back region B, as shown in FIG. 1, over the entire circumference of the waist opening 7. A substantially continuous annular waist gather 70 is formed. The waist elastic member 71 has a thread shape or a band shape, and is fixed between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 by an arbitrary joining means such as a hot-melt adhesive in an expanded state. In the diaper 1, the waist elastic members 71 are arranged at equal intervals in the longitudinal direction X.

  In the diaper 1, the exterior body 10 is in the expanded and expanded state of the diaper 1 shown in FIG. 2, between the lower end on the crotch region C side of the waist gather 70 in the ventral region A and the virtual ventral inward line Ya, And one or a plurality (in the present embodiment, a plurality of) of the waist gathers 70 in the back side region B, which are arranged on the respective waistline portions D between the lower end of the crotch region C side and the virtual back side inward line Yb. A waistline elastic member 91 is provided, and the waistline gathering member 90 is formed by the waistline elastic member 91. The waistline elastic member 91 is fixed to the exterior body 10 in a stretched state in the lateral direction Y in the waistline portions D of the ventral region A and the back region B, respectively. Further, the waistline elastic member 91 is divided into a plurality of portions in the portion of the exterior body 10 that overlaps the absorbent main body 5, and is in a state in which no contractile force is expressed. Therefore, in the exterior body 10, the waistline gathers 90 are not formed in the portions overlapping the absorbent main body 5 in the waistline portions D of the ventral region A and the backside region B, respectively. Thereby, as shown in FIG. 1, the waistline gather 90 is in a state of being divided into a plurality of parts in the lateral direction Y in the portion of the exterior body 10 that overlaps the absorbent main body 5. The waistline elastic member 91 has a thread shape or a belt shape, and is fixed between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 by an arbitrary joining means such as a hot melt adhesive. Further, the waistline elastic members 91 are arranged at equal intervals in the longitudinal direction X in the diaper 1.

  Further, in the diaper 1, the exterior body 10 includes one or a plurality of (three in the present embodiment) arranged along the peripheral edge of each of the pair of leg openings 8, 8, as shown in FIG. 1. An abdominal leg elastic member 81a and a back leg elastic member 81b are provided, and the abdominal leg elastic member 81a and the dorsal leg are provided at the peripheral edge of each of the pair of leg openings 8, 8 of the exterior body 10. A pair of leg gathers 80, 80 is formed by the elastic member 81b.

In the diaper 1, the ventral leg elastic member 81 a is arranged in an extended state along the one leg opening 8 from the ventral region A side of the outer package 10 in the expanded and extended state of the diaper 1 shown in FIG. 2. The crotch region C is arranged in the center in the longitudinal direction X in an inwardly extending state in the lateral direction Y, and further extends along the other leg opening 8 from the ventral region A side of the exterior body 10. It is arranged in a state and is arranged in an extended state inward in the lateral direction Y at the central portion of the crotch region C.
The portion of the ventral leg elastic member 81a that is extended inward in the lateral direction Y is the lateral center line Yc and the virtual ventral inward line Ya at the center in the longitudinal direction X in the crotch region C. Between the two and the center line Yc, and extends inward in the lateral direction Y so as to overlap the absorbent main body 5.

In the diaper 1, the back leg elastic member 81 b is arranged in an extended state along the one leg opening 8 from the back side region B side in the exterior body 10 in the expanded and extended state of the diaper 1 shown in FIG. 2. The crotch region C is arranged in an extended state inward in the lateral direction Y at the center of the crotch region C, and further extended in the extended state along the other leg opening 8 from the back region B side of the exterior body 10. In addition, the crotch region C is arranged in an extended state inward in the lateral direction Y at the central portion.
The portion of the back leg elastic member 81b that is arranged in an inwardly extending state in the lateral direction Y is the horizontal center line Yc and the virtual ventral inward line Ya at the center of the crotch region C in the longitudinal direction X. And extends inward in the lateral direction Y through the lateral center line Yc and overlaps the absorbent main body 5.

  In the diaper 1, the ventral leg elastic member 81 a and the back leg elastic member 81 b bisect the diaper 1 in the longitudinal direction X at the center of the crotch region C when the diaper 1 shown in FIG. It crosses on the ventral region A side with respect to the horizontal center line Yc extending in the horizontal direction Y, includes the crossed portion, and the exterior body by an adhesive inward in the horizontal direction Y from the crossed portion 10 is fixed.

  The ventral leg elastic member 81a will be described in detail. In the diaper 1, the ventral leg elastic member 81a is hot at one side edge AS of the ventral region A in the expanded and extended state of the diaper 1 shown in FIG. It is fixed to the outer package 10 with a melt type adhesive. And it is arranged in an extended state from the one side edge portion AS along the opening peripheral edge portion of the one leg opening portion 8, and is applied to the exterior body 10 by a hot melt adhesive at the center portion in the longitudinal direction X of the crotch region C. It is fixed. Similarly, the ventral leg elastic member 81a is joined to the exterior body 10 at the other side edge AS of the ventral region A with a hot melt adhesive. And it is arranged in an extended state from the other side edge portion AS along the opening peripheral edge portion of the other leg opening portion 8, and is applied to the exterior body 10 by a hot melt adhesive at the central portion in the longitudinal direction X of the crotch region C. It is fixed. From the viewpoint of fit performance, the ventral leg elastic member 81a is fixed to the exterior body 10 by a hot-melt adhesive at the side edges AS, AS of the ventral region A and the central portion in the longitudinal direction X of the crotch region C, In order to further reduce the shrinkage force in the vertical direction X and prevent the wrinkles extending in the horizontal direction Y from occurring, the opening peripheral edges of the leg openings 8 and 8 are not bonded and are not fixed to the exterior body 10. It is preferable.

  The back leg elastic member 81b will be described in detail. In the diaper 1, the back leg elastic member 81b is hot at one side edge BS of the back side region B in the expanded and extended state of the diaper 1 shown in FIG. It is fixed to the outer package 10 with a melt type adhesive. And it is arranged in an extended state from the one side edge portion BS along the opening peripheral edge portion of the one leg opening portion 8, and is applied to the exterior body 10 by a hot melt adhesive at the center portion in the longitudinal direction X of the crotch region C. It is fixed. Similarly, the back leg elastic member 81b is joined to the exterior body 10 at the other side edge BS of the back side region B by a hot melt adhesive. And it is arranged in an extended state from the other side edge portion BS along the opening peripheral edge portion of the other leg opening portion 8, and is attached to the exterior body 10 by a hot melt adhesive at the center portion in the longitudinal direction X of the crotch region C. It is fixed. From the viewpoint of fit performance, the back leg elastic member 81b is fixed to the exterior body 10 with a hot-melt adhesive at the side edges BS, BS of the back side region B and the central portion in the longitudinal direction X of the crotch region C, In order to further reduce the shrinkage force in the vertical direction X and prevent the wrinkles extending in the horizontal direction Y from occurring, the opening peripheral edges of the leg openings 8 and 8 are not bonded and are not fixed to the exterior body 10. It is preferable.

Further, as shown in FIG. 2, the abdominal leg elastic member 81a and the dorsal leg elastic member 81b intersect each other on the abdominal area A side of the lateral center line Yc at the center of the crotch area C as described above. In the state where they are overlapped with each other, they are arranged in an extended state inward in the lateral direction Y.
For example, when there are three ventral leg elastic members 81a and dorsal leg elastic members 81b as in this embodiment, the ventral leg elastic member 81a located on the innermost side and the dorsal leg elastic member positioned on the outermost side 81b intersects and overlaps, and the outermost ventral leg elastic member 81a and the innermost dorsal leg elastic member 81b intersect and overlap. And the belly side leg elastic member 81a and the back side leg elastic member 81b located in the middle are arranged so that it may cross and overlap. As described above, in the diaper 1, in the central portion of the crotch region C, the three abdomen and dorsal leg elastic members 81 a and 81 b are arranged inward in the lateral direction Y with the longitudinal direction X spaced apart from each other. It is arranged towards.
The abdominal leg elastic member 81a and the back leg elastic member 81b include a portion where they intersect each other, and the exterior is covered with a hot melt adhesive inward in the lateral direction Y from the intersecting portion. It is fixed to the body 10. In the diaper 1, the abdominal leg elastic member 81 a and the back leg elastic member 81 b intersect at the portion of the exterior body 10 that overlaps the absorber 4, and are fixed to the exterior body 10 at this portion.

  The number of ventral leg elastic members 81a and dorsal leg elastic members 81b is preferably one or more, more preferably two or more, from the viewpoint of fit performance, to further reduce the contraction force in the longitudinal direction X. From the viewpoint of preventing wrinkles extending in the lateral direction, it is preferably 5 or less, more preferably 3 or less, preferably 1 or more and 5 or less, more preferably 2 or more and 3 or less.

  When there are a plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b, the plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b support the absorber without dispersing stress. The exterior body at the center portion in the longitudinal direction X, rather than the interval in the longitudinal direction X when it is fixed to the exterior body 10 at both side edges BS, BS of the dorsal region B and the both side edges AS, AS of the ventral region A It is preferable that the interval in the longitudinal direction X when being fixed to 10 is narrower. In this case, it is preferable that there is no interval in the vertical direction X between the plurality of ventral leg elastic members 81a and the plurality of back leg elastic members 81b at the center in the vertical direction X.

  When there are a plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b, the plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b are provided on both side edges BS and BS of the dorsal region B. It is preferable to fix to the exterior body 10 so that the space | interval of the vertical direction X becomes equal in each of the both-sides edge part AS and AS of the ventral region A, and the center part of the vertical direction X.

  Furthermore, in the diaper 1, at the center of the crotch region C, the angle α formed by the back leg elastic member 81b and the side edges 46, 46 along the longitudinal direction X of the absorber 4 is not less than 30 degrees and not more than 90 degrees. . The angle α will be described in detail. In the central part of the crotch region C, in the diaper 1, as shown in FIG. 3A, both side edges 46, 46 along the longitudinal direction X of the back leg elastic member 81 b and the absorber 4. The angle α formed with each of them is 30 degrees or more, preferably 50 degrees or more, more preferably 60 degrees or more. The angle α is 90 degrees or less. Specifically, the angle α is 30 degrees or more and 90 degrees or less, preferably 50 degrees or more and 90 degrees or less, more preferably 60 degrees or more and 90 degrees or less. Note that the angle α formed between the back leg elastic member 81b and the side edges 46, 46 along the longitudinal direction X of the absorber 4 means not an obtuse angle but an acute angle.

  The angle α formed between the back leg elastic member 81b and both side edges 46, 46 along the longitudinal direction X of the absorber 4 is, for example, at least one back leg when there are a plurality of back leg elastic members 81b. The angle α formed between the elastic member 81 b and both side edges 46, 46 along the longitudinal direction X of the absorbent body 4 only needs to be within the above range, and all of the plurality of back leg elastic members 81 b are all longitudinal of the absorbent body 4. It is preferable that the angle α formed between the side edges 46 and 46 along the direction X is within the above range.

In the center of the crotch region C, the angle α formed by the back leg elastic member 81b and the side edges 46, 46 along the longitudinal direction X of the absorbent body 4 is 30 degrees or more and 90 degrees or less, so that the back leg The contractive force acting in the direction along the longitudinal direction X of the absorbent body 4 by the elastic member 81b is reduced, and generation of wrinkles in the lateral direction Y of the absorbent body 4 is suppressed.
For example, if the angle formed between the back leg elastic member 81b and both side edges 46, 46 along the longitudinal direction X of the absorbent body 4 is α, both side edges 46, 46 along the longitudinal direction X of the absorbent body 4 are the back side. The stress acting in the longitudinal direction X due to the contraction force of the leg elastic member 81b can be expressed as cos α. Since the value of cos α decreases as the angle α approaches 90 degrees, the angle α formed by the back leg elastic member 81b and the side edges 46 and 46 along the longitudinal direction X of the absorber 4 is 30 degrees or more and 90 degrees. By making it below, it becomes difficult to generate wrinkles on the absorbent body 4 disposed in the crotch region C, and good fit in the pair of leg openings 8 and 8 can be maintained.

In the diaper 1, the crotch region C of the exterior body 10 is between the portions where the abdominal leg elastic member 81 a and the back leg elastic member 81 b intersect in the expanded and extended state of the diaper shown in FIG. 2. Further, the ventral leg elastic member 81a and the dorsal leg elastic member 81b have a portion that is not arranged in a state in which a contractile force is exerted.
In the diaper 1, the abdominal leg elastic member 81 a and the back leg elastic member 81 b have a pair of side non-stacking portions 44, in a portion overlapping the absorbent main body 5 at the center in the longitudinal direction X in the crotch region C. The outer side of 44 in the lateral direction Y is fixed to the outer package 10 in an expanded state. And the abdominal leg elastic member 81a and the back leg elastic member 81b are not arranged between the pair of side non-stacking portions 44, 44 in a state where a contractile force is developed.
In order not to express the contraction force of the ventral leg elastic member 81a and the dorsal leg elastic member 81b, for example, the ventral leg elastic member 81a and the dorsal leg elastic member 81b can be cured by heat. In the diaper 1, the abdominal leg elastic member 81a and the back leg elastic member 81b are divided into a plurality of pieces so as not to develop a contractile force. That is, in the diaper 1, the ventral leg elastic member 81 a and the back leg elastic member 81 b are divided between the pair of side non-stacking portions 44, 44 and divided in the lateral direction Y. Yes.
The abdominal leg elastic member 81a and the back leg elastic member 81b are fixed to the exterior body 10 in an extended state outwardly in the lateral direction Y from the pair of side non-stacking fibers 44, 44, and a pair of side non-stacking fibers. By not arranging the portions 44 and 44 in a state in which a contractile force is generated, good uprightness of both side portions along the longitudinal direction X of the absorbent core 40 (lower absorbent layer 412) can be obtained.

  Moreover, in the diaper 1, in the center part of the crotch region C, the angle β formed by the abdominal leg elastic member 81a and the side edges 46, 46 along the longitudinal direction X of the absorbent body 4 is not less than 40 degrees and not more than 90 degrees. . The angle β will be described in detail. At the center of the crotch region C, in the diaper 1, as shown in FIG. 3B, both side edges 46, 46 along the longitudinal direction X of the abdominal leg elastic member 81 a and the absorbent body 4. The angle β formed with each of them is preferably 40 degrees or more, more preferably 50 degrees or more, and further preferably 60 degrees or more. The angle β is preferably 90 degrees or less. Specifically, the angle β is preferably 40 degrees or more and 90 degrees or less, more preferably 50 degrees or more and 90 degrees or less, and further preferably 60 degrees or more and 90 degrees or less. Note that the angle β formed between the ventral leg elastic member 81a and the side edges 46, 46 along the longitudinal direction X of the absorber 4 means not an obtuse angle but an acute angle.

  The angle β formed between the ventral leg elastic member 81a and both side edges 46, 46 along the longitudinal direction X of the absorber 4 is, for example, at least one ventral side when there are a plurality of ventral leg elastic members 81a. The angle β formed between the leg elastic member 81 a and both side edges 46, 46 along the longitudinal direction X of the absorber 4 only needs to be within the above range, and each of the plurality of ventral leg elastic members 81 a is all of the absorber 4. It is preferable that the angle β formed between the side edges 46 and 46 along the longitudinal direction X is within the above range.

In the center of the crotch region C, the angle β formed between the ventral leg elastic member 81a and the side edges 46, 46 along the longitudinal direction X of the absorbent body 4 is set to 40 degrees or more and 90 degrees or less, so that the ventral leg The contractive force acting in the direction along the longitudinal direction X of the absorbent body 4 by the elastic member 81a is reduced, and generation of wrinkles in the lateral direction Y of the absorbent body 4 is suppressed.
For example, if the angle formed between the ventral leg elastic member 81a and both side edges 46 and 46 along the longitudinal direction X of the absorber 4 is β, the side edges 46 and 46 along the longitudinal direction X of the absorber 4 are the ventral side. The stress acting in the longitudinal direction X by the contraction force of the leg elastic member 81a can be expressed as cos β. Since the value of cos β decreases as the angle β approaches 90 degrees, the angle β formed between the ventral leg elastic member 81a and both side edges 46 and 46 along the longitudinal direction X of the absorber 4 is 40 degrees or more and 90 degrees. By making it below, it becomes difficult to generate wrinkles on the absorbent body 4 disposed in the crotch region C, and good fit in the pair of leg openings 8 and 8 can be maintained.

  Moreover, in the diaper 1, the thickness of the ventral leg elastic member 81a and the dorsal leg elastic member 81b is not less than 310 dtex and not more than 620 dtex. In the diaper 1, the thickness of the ventral leg elastic member 81a and the back leg elastic member 81b is dtex. The thickness of the abdominal leg elastic member 81a and the back leg elastic member 81b is preferably 310 dtex or more, more preferably 470 dtex or more from the viewpoint of fit performance, and extends in the lateral direction by further reducing the contraction force in the vertical direction X. From the viewpoint of preventing generation of wrinkles, it is preferably 620 dtex or less, preferably 310 dtex or more and 620 dtex or less, more preferably 470 dtex or more and 620 dtex or less. By setting the thickness of the abdominal leg elastic member 81a and the back leg elastic member 81b to be 310 dtex or more and 620 dtex or less, both fit performance and wrinkle reduction effect can be achieved.

Moreover, in the diaper 1, in the unfolded and extended state of the diaper 1 shown in FIG. 2, the abdominal leg elastic member 81a and the dorsal leg elastic member 81b are disposed inward in the lateral direction Y from the intersecting portion. 412 extends to a position overlapping each side non-stacking portion 44. The abdominal leg elastic member 81 a and the back leg elastic member 81 b are arranged on the portion of the exterior body 10 that overlaps with each side non-stacking portion 44 over the entire region in the lateral direction Y of each side non-stacking portion 44. However, it is only necessary to be disposed on the portion of the outer package 10 that overlaps a part of the lateral non-stacking portion 44 in the lateral direction Y. For example, it suffices that half or more of the length in the lateral direction Y of each side non-stacked fiber portion 44 is disposed on the portion of the exterior body 10 that overlaps each side non-stacked fiber portion 44.
The ventral leg elastic member 81a and the back leg elastic member 81b are arranged in the lateral direction Y in the center of the crotch region C up to a portion overlapping each side non-stacking portion 44, whereby a pair of side non-stacks When the low basis weight portions 42 and 42 are erected with the fine portions 44 and 44 as bending starting points, good lateral leakage prevention properties can be obtained and fitting properties can be improved.
For example, in the case of having a plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b, an exterior that overlaps at least one ventral leg elastic member 81a or dorsal leg elastic member 81b and each side non-stacked portion 44. It suffices if it is arranged in the body 10 part, and each of the plurality of ventral leg elastic members 81a and dorsal leg elastic members 81b are all arranged in the part of the exterior body 10 that overlaps the respective side non-stacking parts 44. Preferably it is.

Next, the material for forming the diaper 1 will be described.
As a material for forming each part of the diaper 1, various materials used for the part of the conventional pants-type disposable diaper can be used without particular limitation. For example, the top sheet 2 can be a hydrophilic and liquid-permeable nonwoven fabric, a resin film having openings formed therein, and the back sheet 3 can be a moisture permeable or moisture permeable resin film or the like. A laminate of a resin film and a non-woven fabric can be used.

  Examples of the fibers constituting the fiber aggregate constituting the absorbent core 40 include hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, polyesters, polyamides, and the like. Condensed fiber or the like can be used. The fiber aggregate is preferably obtained through a fiber stacking process in which a fiber material supplied on an air stream is sucked and deposited in a recess having a predetermined shape. It may be a fiber material mixed with a functional material. Examples of the holding form of the functional material include a form in which the functional material is held between two fiber assemblies, and a state in which the functional material is held between fibers by mixing and filamenting. Functional materials such as fibers and water-absorbing polymers can be used singly or in combination of two or more. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include particles made of a polymer, a saponified product thereof, polyaspartic acid and the like.

  As the leak-proof cuff forming sheet 56, a composite nonwoven fabric having a multilayer structure composed of spunbond, meltblown, spunbond, or the like, a spunbond nonwoven fabric, a heat bond nonwoven fabric, an air-through nonwoven fabric, or the like can be used.

The elastic members such as the waist elastic member 71, the waist elastic member 91, the abdominal leg elastic member 81a, and the back leg elastic member 81b are not particularly limited as long as they are usually used for absorbent articles such as disposable diapers. Can be used. For example, the elastic members 71, 91, 81a, 81b are preferably in the form of threads (thread rubber or the like), belts having a predetermined width (flat rubber or the like), and particularly preferably thread-like. Examples of the material of the elastic members 71, 91, 81a, and 81b include natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, and urethane. The expansion ratio of the elastic members 71, 91, 81a, 81b is 160% to 250% from the viewpoint of achieving both troubles such as elastic body traces on the skin and no gaps around the legs. It is preferable that it is 200% to 240%. The expansion magnification here is a value obtained from the following equation when the length when not stretched is A (mm) and the length when stretched is B (mm).
Stretch magnification (%) = (B / A) × 100

  Various known cutting means can be used for the cut for dividing the waist elastic member 91, the abdominal leg elastic member 81a, and the back leg elastic member 81b so as not to develop the contraction force. For example, a pinch cutter, a rotary die cutter, a heat seal cutter, an ultrasonic cutter, a water jet cutter, or the like can be used.

  As the outer layer sheet 11 and the inner layer sheet 12 constituting the outer package 10, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, as the outer layer sheet 11 and the inner layer sheet 12, a water-repellent nonwoven fabric or the like can be used.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not limited to the above-mentioned embodiment.

  For example, in the present embodiment, from the viewpoint of further improving the flexibility in the lateral direction Y, as shown in FIG. 2, the absorbent core 40 of the diaper 1 has a central non-stacking portion 43 and a pair of side portion non-stacking fibers. Although the parts 44 and 44 are provided, the pants-type disposable diaper according to the present invention can provide the absorbent core 40 with the flexibility in the lateral direction Y even by providing the absorbent core 40 with a pair of side non-stacking parts 44 and 44. Can be increased.

  Moreover, in this embodiment, as shown in FIG. 1, although demonstrated using the diaper 1 which has the exterior body 10 covering the ventral region A, the crotch region C, and the back region B, in this invention, an exterior body is It is divided into a dorsal sheet member disposed on the back side of the wearer and an abdominal sheet member disposed on the ventral side, and the dorsal sheet member and the ventral sheet member are joined together by a pair of side seal portions. In addition, the pouch-type disposable diaper of the outer packaging material division type in which the absorbent main body is bridged and fixed between the back-side sheet member and the abdominal-side sheet member may be used.

  Moreover, in this embodiment, as shown in FIG. 4, although the part used as the 2 layer structure where the upper absorption layer 411 was laminated | stacked on the skin opposing surface of the lower absorption layer 412 was made into the high basic weight part 41, this invention Then, the high basic weight part may be a thick part provided in a part of the absorbent core having a single layer structure. Moreover, in this embodiment, although the continuous linear center non-stacking fiber part and a pair of side non-stacking fiber part which penetrated the thickness direction along the vertical direction X were used, in this invention, a continuous line thing Instead of this, a central non-stacking portion and a pair of side non-stacking portions having partially discontinuous portions may be used.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 4 Absorbent body 40 Absorbent core 41 High basic weight part 42 Low basic weight part 411 Upper absorbent layer 412 Lower absorbent layer 44 Side non-stacked fiber part 5 Absorbent main body 7 Waist opening 70 Waist gather 8 Leg Opening 80 Leg gather 81a Abdominal leg elastic member 81b Dorsal leg elastic member 10 Exterior body A Abdominal side area B Back side area C Inseam area AS Both side edges BS on the abdominal area side of the exterior body Back side area of the exterior body Side edge S side seal part Yc Horizontal center line

Claims (6)

It has a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction perpendicular to the wearer's front-rear direction, and is arranged on the abdomen region disposed on the abdomen side of the wearer, the crotch region disposed on the crotch region, and the back side. An outer body covering the dorsal region and an absorbent main body having an absorbent body fixed to the skin-facing surface side of the outer body, both side edges of the outer body and the dorsal region in the ventral region A pants-type disposable diaper in which a pair of side seal parts, a waist opening part and a pair of leg opening parts are formed, joined to both side edges of the exterior body in
A pair of leg gathers is formed by the ventral leg elastic member and the back leg elastic member arranged along the opening peripheral edge of each of the pair of leg openings,
In the expanded and extended state of the pants-type disposable diaper,
The ventral leg elastic member is arranged in an extended state along the one leg opening from the ventral region side of the exterior body, and inward in the lateral direction at the longitudinal center of the crotch region. Furthermore, it is arranged in an extended state from the ventral region side of the exterior body along the other leg opening, and inward in the lateral direction at the central portion of the crotch region. It is arranged in an extended state,
The dorsal leg elastic member is arranged in an extended state along one leg opening from the dorsal region side of the exterior body, and inward in the lateral direction at the central portion of the crotch region. It is arranged in an extended state, and further arranged in an extended state from the dorsal region side of the exterior body along the other leg opening, and inward in the lateral direction at the central portion of the crotch region It is arranged in an extended state,
The ventral leg elastic member and the dorsal leg elastic member are located on the ventral region side of the center part of the crotch region with respect to the lateral center line extending in the lateral direction that bisects the pants-type disposable diaper in the vertical direction. Crossed with, and fixed to the exterior body by an adhesive inward in the lateral direction from the intersecting part,
An underpants-type disposable diaper in which an angle formed by the back leg elastic member and both side edges along the longitudinal direction of the absorber is 30 degrees or more and 90 degrees or less in the central portion of the crotch region. In the expanded and extended state of the pants-type disposable diaper,
The crotch region of the exterior body includes a contraction force between the ventral leg elastic member and the dorsal leg elastic member between portions where the ventral leg elastic member and the dorsal leg elastic member intersect. The underpants type disposable diaper of Claim 1 which has the part which is not arranged in the state which expresses. In the expanded and extended state of the pants-type disposable diaper,
The underpants-type disposable diaper according to claim 1 or 2, wherein an angle formed between the ventral leg elastic member and both side edges along the longitudinal direction of the absorber is 40 degrees or more and 90 degrees or less.   The pants-type disposable diaper according to any one of claims 1 to 3, wherein the ventral leg elastic member and the dorsal leg elastic member have a thickness of 310 dtex or more and 620 dtex or less. The absorber is formed in a two-layer structure having an upper absorbent layer and a lower absorbent layer that is laterally longer than the upper absorbent layer,
The lower absorbent layer has a side non-stacking portion that penetrates the lower absorbent layer,
The pants-type disposable diaper according to any one of claims 1 to 4, wherein the side non-stacking portions are formed on both side portions in the lateral direction of the lower absorbent layer. In the expanded and extended state of the pants-type disposable diaper,
The abdominal leg elastic member and the dorsal leg elastic member extend inward in the lateral direction from the intersecting portion to a position overlapping each side non-stacked portion of the lower absorbent layer. The underpants-type disposable diaper according to claim 5.

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