JP2018068818A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a pressure feeling to legs of a wearer and enhance leakage prevention property and fitting feeling.SOLUTION: An underpants type disposable diaper 1 comprises: an exterior body 10 which extends over an abdominal area A, a crotch area C and a back side area B; and an absorbent body 5 having an absorbent core 40, and there are formed a pair of side seal parts S, S, a waist opening part 7 and a pair of leg opening parts 8, 8. In an expanded and stretched state, the absorbent core 40 has a pair of side part non-laminated fiber parts 44, 44 on both side parts along a vertical direction of the absorbent core. The pair of side part non-laminated fiber parts 44, 44 are arranged to extend in the vertical direction X between a virtual abdominal side inner line Ya and a virtual back side inner line Yb. A crotch part gathering 60 is formed between a lateral center line Yc and the virtual abdominal side inner line Ya, and the crotch elastic member 61 is arranged along the lateral center line Yc over parts which are overlapped to respective side part non-laminated fiber parts 44, 44 from outer end parts of respective leg opening parts 8 on the exterior body 10.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 in the ventral region and both side edges of the exterior body in the back region 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, in order to improve the leakage preventing property of the absorbent body provided in the absorbent main body, for example, a portion where the absorbent core of the absorbent body does not have a slit or a part of the core forming material. Various techniques have been proposed for improving the flexibility by providing a layer.

  The applicant previously provided a center bending guide part and a side bending guide part composed of a non-stacked fiber part in a vertically long absorbent core, and the center bending guide part and the side bending guide part are bent starting points. By doing so, a disposable diaper was proposed in which the bendability of the absorbent core was increased to improve leakage prevention (see Patent Document 1).

JP 2012-16435 A

  However, although the disposable diaper described in Patent Document 1 has a structure in which the absorbent core is easily deformed, the absorbent core is deformed by the force of the wearer's both legs. There is a possibility of feeling a sense of pressure. Thus, the disposable diaper described in Patent Document 1 has room for further improvement.

  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 outer body over the back region disposed on the side, and an absorbent main body having an absorbent core fixed to the skin-facing surface side of the outer body, both side edges of the outer body in the ventral region And a pants-type disposable diaper in which a pair of side seal portions, a waist opening, and a pair of leg openings are formed by joining both side edges of the exterior body in the dorsal region, In the deployed and extended state of the disposable diaper, the absorbent core has a pair of side non-stacking portions penetrating in the thickness direction on both sides along the longitudinal direction of the absorbent core, and the pair of side portions The non-stacking portion is in front of the pair of side seal portions on the ventral region side. A virtual ventral inward line connecting inner ends on the crotch region side and a virtual dorsal inner line connecting inner ends on the crotch region side of the pair of side seal portions on the back side region side Between the lateral center line extending in the lateral direction that bisects the disposable diaper in the longitudinal direction and the virtual ventral inward line, A crotch lower gather that extends and contracts in the lateral direction is formed by a crotch elastic member fixed to the exterior body in a state of extending in the direction, and the crotch elastic member is formed at an outer end of each leg opening in the exterior body. A pants-type disposable diaper that is disposed along the lateral center line from a portion to a portion that overlaps each of the side non-stacked portions is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the feeling of pressure to both legs at the time of wear, leak prevention property can be improved.

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. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a schematic view showing a state where the absorbent core is bent.

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; An absorbent main body 5 having an absorbent core 40 fixed to the skin facing surface side of the exterior body 10 is provided. 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 is a pair of side non-stacked fibers that penetrate in the thickness direction on both sides along the longitudinal direction X of the absorbent core 40 in the expanded and extended state of the diaper 1 shown in FIG. 2. It has the parts 44 and 44 (refer FIG. 3). The pair of side non-stacking portions 44, 44, when the diaper 1 is unfolded and extended, are formed by the inner end Sa, Sa on the crotch region C side of the pair of side seal portions S, S on the abdominal region A side. The connected virtual ventral inward line Ya and the virtual dorsal inward line Yb connecting the inner ends Sb, Sb of the pair of side seal portions S, S on the back side region B side on the crotch region C side It extends in the vertical direction X between them. A pair of side part non-stacking parts 44 and 44 are distribute-arranged with respect to the vertical center line Xc extended in the vertical direction X which bisects the diaper 1 to the horizontal direction Y. As shown in FIG. Moreover, it is preferable that a pair of side part non-stacking parts 44 and 44 are provided over the horizontal centerline Yc mentioned later in the approximate center part of the vertical direction X of the diaper 1 in the expansion | deployment and expansion | extension state of the diaper 1.

  In the present invention, “the pair of side non-stacking portions 44, 44 is the inner end of the pair of side seal portions S, S on the abdomen region A side on the crotch region C side when the diaper 1 is deployed and extended. 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 is arranged so as to extend in the longitudinal direction X between the line Yb” and “a pair of side non-stacking portions 44 like the diaper 1 in the expanded and extended state of the diaper 1 shown in FIG. 2. , 44 are spaced inward from the virtual ventral inward line Ya and the virtual dorsal inward line Yb, as well as the virtual ventral inward line Ya and the virtual dorsal inward line Yb. Or between the virtual ventral inward line Ya and the virtual back inward line Yb, and It is meant to include the form extending one from at least virtual ventral inner lines Ya and virtual dorsal inner line Yb to the outside in the longitudinal direction X.

  The diaper 1 will be described in detail. The absorbent core 40 includes 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. More than the high basis weight portion 41 which is arranged outward in the lateral direction Y than the pair of side non-stacking portions 44, 44 arranged on both sides outward along the longitudinal direction X of the high basis weight portion 41. It has a pair of low basis weight parts 42 and 42 of low basis weight. As shown in FIG. 3, the absorbent core 40 is formed in a two-layer structure having 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 absorbent core 40 is a center that penetrates in the thickness direction along the longitudinal direction X of the absorbent core 40 in the center part of the transverse direction Y in the expanded and expanded state of the diaper 1 shown in FIG. 2. The non-stacking portion 43 is provided. The center non-stacking portion 43 is formed in a substantially rectangular shape along the vertical direction X. By providing the central non-stacked fiber portion 43 in the absorbent core 40, for example, when stress occurs in the crotch region C from the outside in the lateral direction Y to the inside, in the longitudinal direction X of the absorbent core 40 It becomes easy to make it adhere to a wearer's urination part by improving the flexibility of the center part along. In the diaper 1, the central non-stacked fiber portion 43 is provided so as to penetrate the high basis weight portion 41 in the thickness direction. That is, as shown in FIG. 3, the central non-stacking portion 43 is formed so as to penetrate in a thickness direction in a portion where the upper absorbent layer 411 and the lower absorbent layer 412 overlap. The high basis weight part 41 (the upper absorbent layer 411 and the upper absorbent layer 411 and the upper absorbent layer 411 and the upper absorbent layer 411 and the upper absorbent layer 411 and the upper absorbent layer 411 and the lower absorbent layer 412) The portion where the lower absorbent layer 412 overlaps) is more easily bent into a convex shape.

  In the diaper 1, the absorbent core 40 is formed with the above-described pair of side non-stacked portions 44, 44 in the lower absorbent layer 412 in the expanded and expanded state of the diaper 1 shown in FIG. 2 (see FIG. 3). ). 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. In other words, the pair of side portion non-stacking portions 44, 44 extends in the longitudinal direction X from the both side edges along the longitudinal side X of the upper absorbent layer 411 to the outer lower absorbent layer 412 in the lateral direction Y. 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.

  In the diaper 1, the absorbent core 40 has a central non-stacked fiber portion 43 and a pair of side non-stacked fiber portions 44, 44 in the expanded and extended state of the diaper 1 shown in FIG. It has a region R1 that overlaps when viewed from the direction Y (hereinafter also referred to as a parallel region R1). The parallel region R1 is a center non-stacked portion 43 and a pair of side non-stacked portions 44, 44 arranged side by side with a space in the lateral direction Y, as viewed from the lateral direction Y of the absorbent core 40. It means a region where all of the fine portion 43 and the pair of side non-stacked portions 44, 44 overlap. The parallel region R1 is provided across the horizontal center line Yc between the virtual ventral inner line Ya and the virtual back inner line Yb. By providing the parallel region R1 in the crotch region C of the absorbent core 40, when stress occurs in the crotch region C from the outside in the lateral direction Y to the inside as shown in FIG. The fine portion 43 becomes a mountain portion, and the side non-stacked portions 44 and 44 become valley portions, and the parallel region R1 is easily bent into a W shape.

In addition, from a viewpoint of improving the flexibility of the absorptive core 40 in the lateral direction Y, the central non-stacked fiber portion 43 and the pair of side non-stacked fiber portions 44, 44 are absorbent in the diaper 1 as shown in FIG. The core material is penetrated in the thickness direction and the material (core forming material) for forming the absorbent core 40 does not exist. For example, the amount of the core forming material less than the low basis weight portion 42 is 20 g. Even when it is slightly present at about / m ^2, it can be included in the non-stacked fiber portion because the same effect can be obtained. However, the basis weight of the core forming material existing in the non-stacked fiber portion is preferably 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. 3. Various known materials can be used as the core wrap sheet 45. For example, a thin paper such as a tissue paper or a 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. 3, as a leak-proof cuff forming sheet 56, one of a band-shaped water-repellent sheet having a predetermined width is folded in two along its longitudinal direction, and a hot-melt adhesive is provided between opposing layers. 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. 3, 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 (absorbent core 40). It has been. The topsheet 2 covers both side portions along the longitudinal direction X of the absorbent body 4 by being wound down to the exterior body 10 side (non-skin facing surface side). By wrapping both sides of the absorbent body 4 (absorbent core 40) along the longitudinal direction X so as to cover it, good standing properties of the absorbent body 4 (absorbent core 40) on the skin-facing surface side are provided. Is 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 a heat seal 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. In addition, 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 no longer contracts. 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 in the lateral direction Y at 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 a pair of leg gathers 80, 80 are formed by the abdominal leg elastic member 81a and the back leg elastic member 81b. The abdominal leg elastic member 81a and the back leg elastic member 81b are thread-like or belt-like, and are extended between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 in an arbitrary state such as a hot-melt adhesive. The connection is fixed by the joining means. In the diaper 1, the ventral leg elastic member 81 a and the back leg elastic member 81 b are arranged at equal intervals in the vertical direction X.

  The abdominal leg elastic member 81a will be described in detail. In the diaper 1, the abdominal leg elastic member 81a is located on the diaper 1 in the developed and extended state of the diaper 1 shown in FIG. It is arranged on the A side. More specifically, the abdominal leg elastic member 81a is arranged in an expanded state along the one leg opening 8 from the abdominal side region A side of the exterior body 10 in the expanded and extended state of the diaper 1 shown in FIG. In addition, the crotch region C is arranged in a stretched state inward in the lateral direction Y at the center in the longitudinal direction X. The ventral leg elastic member 81a is arranged in an extended state from the ventral region A side of the exterior body 10 along the other leg opening 8, and in the lateral direction at the center of the crotch region C in the longitudinal direction X. It is arranged in an extended state toward the inside of Y. 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. Preferably, the portion of the ventral leg elastic member 81a that is arranged in an inwardly extending state in the lateral direction Y is the horizontal center line Yc and the virtual ventral side in the center of the crotch region C in the longitudinal direction X. It extends so as to extend inward in the lateral direction Y through the lateral line Ya toward the lateral line Ya and overlap with the parallel region R1 of the absorbent core 40 described above.

  Similarly, the back leg elastic member 81b will be described in detail. In the diaper 1, the back leg elastic member 81b is in the crotch region from the back side region B of the exterior body 10 in the expanded and extended state of the diaper 1 shown in FIG. It is distributed over C. More specifically, the back leg elastic member 81b 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. In addition, the crotch region C is arranged in a stretched state inward in the lateral direction Y at the center in the longitudinal direction X. Further, the back leg elastic member 81b is arranged in an extended state from the back side region B side of the exterior body 10 along the other leg opening 8 and at the center of the crotch region C in the longitudinal direction X in the lateral direction Y. It is arranged in a stretched state toward the inside. 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. Preferably, the portion of the dorsal leg elastic member 81b that is extended inward in the lateral direction Y has a lateral center line Yc and a virtual ventral inner side at the center in the longitudinal direction X in the crotch region C. It is arranged so as to extend inward in the lateral direction Y through the lateral line Ya between the side line Ya and overlap with the parallel region R1 of the absorbent core 40 described above.

As shown in FIG. 2, the ventral leg elastic member 81 a and the back leg elastic member 81 b have a pair of side non-stacked fibers in a portion overlapping the absorbent main body 5 at the center in the longitudinal direction X in the crotch region C. Outside the portions 44 and 44 in the lateral direction Y, the outer body 10 is fixed to the exterior body 10 in an extended state. Further, the ventral 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 in which contraction 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.

  In the diaper 1, the exterior body 10 is arranged in the lateral direction Y in a portion of the exterior body 10 between the lateral center line Yc and the virtual ventral inward line Ya in the expanded and expanded state of the diaper 1 shown in FIG. One or a plurality of (in this embodiment, a plurality of) crotch elastic members 61 fixed to the exterior body 10 in an expanded state are provided, and a crotch lower gather 60 that expands and contracts in the lateral direction Y by the crotch elastic member 61. Is formed. The crotch elastic member 61 is arranged along the horizontal center line Yc from the outer end of each leg opening 8 in the exterior body 10 to a portion overlapping each side non-stacking portion 44. The crotch elastic member 61 is arranged only in the lateral direction Y along the lateral center line Yc from the outer end portion of each leg opening 8 in the exterior body 10 to the portion overlapping each side non-stacking portion 44. It is preferable that the diaper 1 is disposed only in the lateral direction Y substantially parallel to the lateral center line Yc.

  The crotch elastic member 61 has a thread shape or a belt shape, and is connected and 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. The number of inseam elastic members 61 is preferably 2 or more, more preferably 4 or more, preferably 8 or less, more preferably from the viewpoint of obtaining good flexibility in the transverse direction Y of the absorbent core 40. 6 or less, preferably 2 or more and 8 or less, more preferably 4 or more and 6 or less.

  Further, as shown in FIG. 2, the crotch elastic member 61 is arranged at a distance from the waistline elastic member 91 on the crotch region C side, which forms the waistline gather 90 on the abdominal region A side, to the lateral center line Yc side. Yes. Ratio of the distance between the waistline elastic member 91 closest to the crotch region C and the crotch elastic member 61 closest to the abdomen region A to the distance between the waistline elastic member 91 closest to the crotch region C and the lateral center line Yc ((most The distance between the waistline elastic member 91 on the crotch region C side and the crotch elastic member 61 on the most abdominal region A side / the space between the waistline elastic member 91 on the crotch region C side and the lateral center line Yc) × 100) From the viewpoint of obtaining good flexibility of the absorbent core 40, preferably 10% or more, more preferably 20% or more, preferably 90% or less, more preferably 80% or less, preferably 10% or more and 90% or less, More preferably, it is 20% or more and 80% or less.

  Further, as shown in FIG. 2, the crotch elastic member 61 is disposed on the ventral region A side with a space from the lateral center line Yc. Of the portion of the horizontal center line Yc that overlaps the absorbent main body 5 of the ventral leg elastic member 81a and the back leg elastic member 81b, the ventral leg elastic member 81a and the back leg elastic member 81b closest to the horizontal center line Yc. Ratio of the distance between the horizontal center line Yc and the crotch elastic member 61 closest to the horizontal center line Yc to the distance ((the distance between the horizontal center line Yc and the crotch elastic member 61 closest to the horizontal center line Yc / the horizontal center line Yc And the distance between the abdominal leg elastic member 81a and the back leg elastic member 81b closest to the lateral center line Yc among the portions of the abdomen leg elastic member 81a and the back leg elastic member 81b overlapping the absorbent main body 5) × 100 ) Is preferably 120% or more, more preferably 200% or more, preferably 800% or less, more preferably from the viewpoint of obtaining good flexibility of the absorbent core 40. 100% or less, preferably 800% to 120% or less, 600% or less and more preferably 200% or more.

  When a plurality of crotch elastic members 61 are provided, the intervals in the vertical direction X between the plurality of crotch elastic members 61 may be equal or different. For example, the interval may be gradually increased in the vertical direction X. When the intervals (pitch) in the vertical direction X between the plurality of crotch elastic members 61 are equal, the interval in the vertical direction X is determined from the viewpoint of obtaining good flexibility of the absorbent core 40. The interval between the waistline elastic members 91 constituting the side waistline gathers 90 in the longitudinal direction X is preferably 1.0 times or more, more preferably 1.2 times or more.

The expansion ratio of the crotch elastic member 61 is preferably 150% or more and 400% or less, and more preferably 200% or more and 350% or less, from the viewpoint of obtaining good flexibility of the absorbent core 40. 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

  According to the diaper 1, it is possible to reduce the feeling of pressure on both legs when worn, and to improve leakage prevention. Specifically, as shown in FIG. 2, the outer body 10 overlaps with the side non-stacking portion 44 from the outer end of each leg opening 8 of the diaper 1 along the horizontal center line Yc. By arranging the crotch elastic member 61 in the direction Y, both side portions along the longitudinal direction of the absorbent core 40 stand up with the pair of side non-stacking portions 44, 44 as bending starting points (see FIG. 4). The absorbent core 40 is easily deformed flexibly with respect to pressure applied inward from both legs. In particular, in the diaper 1, the crotch elastic member 61 is arranged only in the lateral direction Y, so that both side portions along the longitudinal direction of the absorbent core 40 with respect to the pressure applied inward from both legs of the wearer are further layered. Easy to stand up. Therefore, the feeling of resistance and discomfort applied to both legs of the wearer are reduced. Moreover, good lateral leakage prevention is also obtained by the fact that both side portions along the longitudinal direction X of the absorbent core 40 stand toward the wearer's skin starting from the pair of side non-stacking portions 44, 44. It is done. That is, according to the pants-type disposable diaper 1 of the present embodiment, it is possible to reduce the feeling of pressure on the legs when worn and to improve the leakage prevention property.

  Further, the central portion of the absorbent core 40 in which the central non-stacked portion 43 is formed can be bent along the longitudinal direction X by the contraction force of the crotch elastic member 61. Therefore, it becomes easy to make this center part contact | adhere to a wearer's urination part, and fitting property improves. Further, urine is smoothly absorbed into the absorbent body 4 and the absorbent core 40 through the central non-stacked fiber portion 43. In particular, the center portion of the absorbent core 40 in the lateral direction Y is set to the high basis weight portion 41, and the center non-stacked fiber portion 43 is provided in the high basis weight portion 41, thereby improving the fit and more. Urine can be smoothly absorbed by the high basis weight portion 41.

  Further, the crotch elastic member 61 has a diaper 1 in the unfolded and extended state of the diaper 1 shown in FIG. The portion overlapping the fine portion 44 is disposed inward in the lateral direction Y, and is not disposed in the high basis weight portion 41 in a state in which a contractile force is expressed. In order to prevent the contraction force from being expressed, the crotch elastic member 61 can be cured by heat. In the diaper 1, the crotch elastic member 61 is divided into a plurality of pieces so that the contraction force is not expressed. Yes. That is, in the diaper 1, the crotch elastic member 61 is divided between the pair of side non-stacking portions 44, 44 and divided in the lateral direction Y.

  As shown in FIG. 2, the crotch elastic member 61 includes all the crotch elastic members 61 arranged side by side with a space in the vertical direction X from the central non-stacked fiber portion 43 and the pair of side non-stacked fiber portions 44, 44. It arrange | positions in the part of the exterior body 10 which overlaps with the parallel area | region R1 which becomes. That is, all the crotch elastic members 61 are arranged in the portion of the exterior body 10 that overlaps with the pair of side non-stacking portions 44, 44. The crotch elastic member 61 is preferably disposed on the portion of the exterior body 10 that overlaps each side non-stacking portion 44 over the entire region in the lateral direction Y of each side non-stacking portion 44, but each side portion What is necessary is just to be distribute | arranged to the part of the exterior body 10 which overlaps with a part of the horizontal direction Y of the non-stacking fiber part 44. FIG. 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 with each side non-stacked fiber portion 44.

  Since the crotch elastic member 61 does not develop a contracting force at the portion where it overlaps the high basis weight portion 41, unnecessary deformation of the high basis weight portion 41 such as twisting of the high basis weight portion 41 is prevented, and the fit property is improved. . Further, the crotch elastic member 61 extends from the outer end of each leg opening 8, 8 to the portion that crosses each low basis weight portion 42 and overlaps each side non-stacking portion 44, 44 in the lateral direction Y. By being arranged toward the direction, the low basis weight portions 42 and 42 stand up with the pair of side non-stacking portions 44 and 44 as bending starting points, so that good lateral leakage prevention properties can be obtained and fit property Will improve.

  In the diaper 1, the crotch elastic member 61 exists only between the lateral center line Yc and the virtual ventral inward line Ya when the diaper 1 shown in FIG. That is, the crotch elastic member 61 is not arranged between the horizontal center line Yc and the virtual back side inward line Yb in the diaper 1. By providing the crotch elastic member 61 only between the lateral center line Yc and the virtual ventral inward line Ya, leakage prevention such as urination is achieved on the ventral region A side of the lateral center line Yc. On the side region B side, defecation and the like can be held.

  The ventral leg elastic member 81a and the back leg elastic member 81b are, in the diaper 1, in the center of the crotch region C in the longitudinal direction X in the developed and extended state of the diaper 1 as shown in FIG. Also intersect on the ventral region A side. The intersecting abdominal leg elastic member 81a and the dorsal leg elastic member 81b are arranged in an extended state inward in the lateral direction Y while being overlapped with each other. The crotch elastic member 61 is arranged on the ventral region A side from the portion arranged inwardly in a state where the ventral leg elastic member 81a and the back leg elastic member 81b intersect and overlap each other. . The crotch elastic member 61 may be arranged near the abdominal leg elastic member 81a and the back leg elastic member 81b arranged inward in the horizontal direction Y at the center in the vertical direction X of the crotch region C. preferable. By disposing the crotch elastic member 61 closer to the ventral region A side than the ventral leg elastic member 81a and the dorsal leg elastic member 81b intersecting at the center in the longitudinal direction X of the crotch region C, a more ventral region Both side portions along the longitudinal direction of the absorbent core 40 are erected on the A side, and good side leakage prevention properties are obtained.

  Further, as shown in FIG. 1, the crotch elastic member 61 has a contraction force larger than the contraction force of the waist elastic member 71 that is fixed to the opening peripheral portion of the waist opening 7 in the exterior body 10 in an expanded state. By making the contraction force of the crotch elastic member 61 larger than the contraction force of the waist elastic member 71, the crotch region C is pulled upward, and a good fit of the crotch region C is obtained.

  The ratio of the contraction force of the crotch elastic member 61 to the contraction force of the waist elastic member 71 ((contraction force of the crotch elastic member 61 / contraction force of the waist elastic member 71) × 100%) is preferably 120% or more, more preferably Is 150% or more, preferably 400% or less, more preferably 300% or less, preferably 120% or more and 400% or less, more preferably 150% or more and 300% or less.

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 waist elastic member 71, the waistline elastic member 91, the abdominal leg elastic member 81a, the back leg elastic member 81b, and the crotch elastic member 61 are 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, and 61 are preferably in the form of a thread (such as thread rubber) or a belt having a predetermined width (such as a flat rubber), and particularly preferably in the form of a thread. Examples of the material for the elastic members 71, 91, 81a, 81b, 61 include natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like. As the expansion ratio of each elastic member 71, 91, 81a, 81b excluding the crotch elastic member 61, from the viewpoint of achieving both troubles such as elastic body traces on the skin and no gaps around the legs. 160% to 350%, and more preferably 200% to 340%. The stretch magnification here is a value obtained by a method similar to the method for obtaining the stretch magnification (%) of the crotch elastic member 61 described above.

  In addition, various known cutting means can be used for cutting for separating the waist elastic member 91 and the crotch elastic member 61 so as not to develop 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. 3, 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 43 Central non-stacked fiber part 44 Side non-stacked fiber part 5 Absorbent body 60 Inseam Gather 61 Inseam elastic member 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 Belly of exterior body Both side edges BS on the side area side Both side edges S on the back side area side of the exterior body S Side seal part Sa Inner end on the crotch area side of the side seal part on the abdominal side area side Sb of the side seal part on the back side area side Inward end Ya on the crotch region side Virtual abdominal side inward line Yb Virtual back side inward line Yc Horizontal center line

Claims (9)

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 core fixed to the skin-facing surface side of the outer body, and both side edges and the dorsal side of the outer body 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 by joining both side edge parts of the exterior body in a region,
In the expanded and extended state of the pants-type disposable diaper,
The absorbent core has a pair of side non-stacking portions penetrating in the thickness direction on both side portions along the longitudinal direction of the absorbent core, and the pair of side non-stacking portions are on the ventral side. A virtual abdominal inward line connecting inner ends of the pair of side seal portions on the region side on the crotch region side, and an inner side of the pair of side seal portions on the back side region side on the crotch region side It extends in the vertical direction between the virtual dorsal inward line connecting the ends,
A crotch fixed to the exterior body in a laterally extended state on a portion of the exterior body between a lateral center line extending in the lateral direction and bisecting the disposable diaper in the longitudinal direction and the virtual ventral inward line An inseam gather that stretches in the lateral direction is formed by an elastic member,
The inseam elastic member is arranged along the lateral center line from the outer end of each leg opening in the exterior body to a portion overlapping each side non-stacking portion. Disposable diapers. The absorbent core has a high basis weight portion that extends in the longitudinal direction at a central portion in the lateral direction, and the pair of side non-stacking portions that are disposed on both sides outward along the longitudinal direction of the high basis weight portion. And a pair of low basis weight parts having a lower basis weight than the high basis weight part,
In the expanded and extended state of the pants-type disposable diaper,
The crotch elastic member is disposed in a lateral direction from an outer end portion on each leg opening side to a portion that crosses each low basis weight portion and overlaps each side non-stacked portion, and The pants-type disposable diaper according to claim 1, wherein the pants-type disposable diaper is not arranged in a state in which a contractile force is expressed in a portion overlapping the basis weight portion.   3. The pants-type disposable diaper according to claim 1, wherein the absorbent core has a central non-stacked fiber portion that penetrates in the thickness direction along the longitudinal direction of the absorbent core at a lateral central portion. The absorbent core 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 pants-type disposable diaper according to any one of claims 1 to 3, wherein the pair of side non-stacked portions are formed in the lower absorbent layer. In the expanded and extended state of the pants-type disposable diaper,
The pants-type disposable diaper according to any one of claims 1 to 4, wherein the crotch elastic member exists only between the lateral center line and the virtual ventral inward line. 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 in the lateral center at the longitudinal center of the crotch region. It is arranged in an extended state toward the direction,
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 longitudinal center of the crotch region. Furthermore, it is arranged in an extended state along the other leg opening from the dorsal region side of the exterior body, and in the lateral center at the longitudinal center of the crotch region. It is arranged in an extended state toward the direction,
The ventral leg elastic member and the dorsal leg elastic member are laterally outward from the pair of side non-stacking portions in a portion overlapping the absorbent main body at a longitudinal center portion in the crotch region. Then, the pants according to any one of claims 1 to 5, wherein the pants are fixed to the exterior body in an extended state and are not arranged in a state in which a contractile force is developed between the pair of side portion non-stacked fiber portions. Type disposable diaper. In the expanded and extended state of the pants-type disposable diaper,
The ventral leg elastic member and the dorsal leg elastic member intersect at the ventral region side of the lateral center line at the longitudinal center of the crotch region,
The pants-type disposable diaper according to claim 6, wherein the crotch elastic member is disposed closer to the ventral region than a portion where the ventral leg elastic member and the dorsal leg elastic member intersect. The absorbent main body includes a surface sheet that covers the skin facing surface of the absorbent core,
The said surface sheet is wound down to the said exterior body side in the both sides along the vertical direction of the said absorptive core, and has coat | covered this both sides, The any one of Claims 1-7 Pants-type disposable diaper.   The contraction force of the crotch elastic member is larger than the contraction force of the waist elastic member fixed in an expanded state to the opening peripheral edge of the waist opening in the exterior body. Pants-type disposable diapers.

Images