JP2016112258A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which suppresses swelling obstruction of an absorbent core and absorber, sufficiently exerts absorbing power of the absorber containing an absorbent polymer, and obtains an excellent leakage prevention property.SOLUTION: An absorber 4 of a disposable diaper includes: an absorbent core 41 containing an absorbent polymer and a core wrap sheet 42. The core wrap sheet 42 is adhered on the absorbent core 41 while interposing an adhesive therebetween. The absorbent core 41 includes a constricted part 41c in a crotch part C. The core wrap sheet 42 includes a non-adhesion area 43N, where a first sheet part 42u forming an upper face and a second sheet part 42d forming a lower face are not adhered to each other, on a side extended part 43 extended from both side edges in the constricted part 41c. In a width direction Y of the diaper, a front sheet 2 includes: a non-adhesion part 21 not adhered on a facing lower side sheet on an outer side than an outer edge part Uo of the first sheet part; and an outer adhesion part 22 adhered on the facing lower side sheet on an outer side than the non-adhesion part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a disposable diaper.

Conventionally, as a disposable diaper, it has a surface sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorbent body disposed between both sheets, and the absorbent body includes an absorbent polymer. The thing provided with the core wrap sheet | seat which wraps an adhesive core and this absorptive core is known. In general, the absorbent polymer expands due to liquid absorption and exhibits excellent absorption performance, and therefore a technique for preventing the absorption of the absorbent body including the absorbent polymer and the water-absorbing polymer from being inhibited is also proposed.
For example, the applicant firstly extends the core wrap sheet outward from the side edge of the constricted portion of the absorbent core and does not bond the upper and lower core wrap sheets in the extended portion, The technique which makes it fully exhibit the absorptive power of the absorptive polymer contained in an absorptive core was proposed (refer patent document 1).
Patent Document 2 discloses an absorbent article having a liquid storage body in which an internal space can expand toward the skin side, and a liquid absorption unit located in the internal space of the liquid storage body. A unit includes a plurality of storage bags formed by joining two liquid-permeable storage sheets and a highly absorbent material that is stored in the storage bag and absorbs the liquid to expand its volume. It has been proposed that a non-joined portion in which a storage sheet is not joined between adjacent storage bags is provided.

JP 2013-99451 A Japanese Patent No. 4137767

  Depending on the technique of Patent Document 1 described above, the absorbency of the absorbent polymer contained in the absorber is effectively exhibited, and the leakage prevention property and the like are improved. However, there is a need to further improve the absorbency and leakproofness. In addition, the absorbent article of Patent Document 2 has a complicated structure, and it is desired that the absorbent article has a simpler structure and exhibits the absorbability of the absorbent polymer.

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

  The present invention is a disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having an abdominal side part, a back side part and a crotch part positioned therebetween in the longitudinal direction. The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet extends laterally from both side edges of the constricted portion of the absorbent core. The extending portion has a non-joining region where the first sheet portion forming the upper surface of the laterally extending portion and the second sheet portion forming the lower surface of the laterally extending portion are not joined. In the width direction of the disposable diaper, the surface sheet Has a non-joining portion that is not joined to the opposing lower sheet outside the outer end portion of the first sheet portion, and is joined to the opposing lower sheet further outside the non-joining portion. A disposable diaper is provided having an outer joint formed thereon.

The present invention is a disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having an abdominal side part, a back side part and a crotch part positioned therebetween in the longitudinal direction. ,
The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet extends laterally from both side edges of the constricted portion of the absorbent core. Weak bonding in which the first sheet portion forming the upper surface of the laterally extending portion and the second sheet portion forming the lower surface of the laterally extending portion are bonded to the protruding portion by a water-soluble adhesive The topsheet has a non-joined portion that is not joined to the opposite lower sheet outside the outer end of the first sheet portion in the width direction of the disposable diaper. , Bonded to the opposite lower sheet, further outward than the non-bonded portion. And has an outer joint part, there is provided a disposable diaper (hereinafter, referred to this invention the term second invention).

  According to the disposable diaper of the present invention, the inhibition of swelling of the absorbent core and the absorbent body is suppressed, the absorbent capacity of the absorbent body including the water-absorbing polymer is sufficiently exhibited, and excellent leakage prevention properties are obtained.

FIG. 1 is a plan view showing a flattened state of the first embodiment of the disposable diaper of the present invention. 2 is a schematic cross-sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged cross-sectional view of the absorber shown by extracting the absorber portion from FIG. 2. FIG. 4 is a view corresponding to FIG. 2 showing a second embodiment of the disposable diaper of the present invention. FIG. 5 is a view corresponding to FIG. 2 showing a third embodiment of the disposable diaper of the present invention. FIG. 6 is a view corresponding to FIG. 2 showing a fourth embodiment of the disposable diaper of the present invention. FIG. 7 is a view corresponding to FIG. 2 showing a fifth embodiment of the disposable diaper of the present invention. FIG. 8 is a view corresponding to FIG. 2 showing a sixth embodiment of the disposable diaper of the present invention.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
1 and 2 show a disposable diaper 1 (hereinafter also referred to as “diaper 1”) according to a first embodiment of the present invention.
As shown in FIGS. 1 and 2, the diaper 1 includes a liquid-permeable top sheet 2, a back sheet 3, and an absorbent body 4 disposed between the two sheets 2 and 3. Moreover, the diaper 1 has a vertically long shape as shown in FIG. 1, and in its longitudinal direction X, the abdominal side A disposed on the abdomen side of the wearer when worn, the back side of the wearer when worn And a crotch part C located between the abdominal side A and the back side B. The diaper 1 is an unfolded disposable diaper, in which a fastening tape 7 is provided on both side edges of the back side B, and a landing tape 8 for fastening the fastening tape 7 is provided on the outer surface of the abdominal side A. It has been. The back sheet 3 is a sheet disposed on the non-skin facing side of the diaper 1 in the thickness direction of the diaper 1, and the back sheet 3 in the present embodiment is liquid impermeable or liquid hardly permeable. It consists of a laminate of a leak-proof sheet 3a made of a conductive resin film and an exterior nonwoven fabric 3b bonded to the non-skin facing surface side of the leak-proof sheet 3a. The back sheet 3 in the present invention may be composed only of the leak-proof sheet 3a.

  Sheets 5 for forming a three-dimensional gather having elastic members 5a are arranged on both sides in the longitudinal direction X of the diaper 1, and the elastic member 5a contracts to the crotch part C in the wearing state to the wearer's skin side. A three-dimensional gather standing up toward is formed. In addition, the leg elastic member 6 is arranged in an extended state at a portion arranged around the leg in the crotch C, and due to the contraction, the crotch C in the worn state fits around the wearer's leg. Leg gathers that improve the performance are formed.

  The absorbent body 4 in the diaper 1 includes an absorbent core 41 containing a water-absorbing polymer and a core wrap sheet 42 that wraps the absorbent core 41. The absorptive core 41 in this embodiment is comprised from the mixed fiber body of fiber materials, such as a pulp fiber, and a water absorbing polymer. The mixed fiber stack is obtained through a fiber stacking process in which the fiber material and the water-absorbing polymer supplied on the air flow are sucked and deposited in the accumulation recesses of a predetermined shape, and using a known fiber stacking apparatus. Can be formed. Examples of fiber materials constituting the absorbent core 41 include hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide. Can be used. 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. The fiber material and the water-absorbing polymer can be used singly or in combination of two or more. As the core wrap sheet 42, for example, tissue paper or a water-permeable nonwoven fabric is used.

  The core wrap sheet 42 in the present embodiment is a square or rectangular sheet, and the length along the longitudinal direction X of the diaper 1 is longer than the length of the absorbent core 41 in the same direction, as shown in FIGS. 2 and 3. Thus, the whole absorbent core 41 is wrapped with one sheet. More specifically, as shown in FIG. 2, the core wrap sheet 42 includes a connecting portion 42c between the core wrap sheets in which one side edge and the other side edge along the longitudinal direction X of the diaper 1 are stacked. It has between the absorptive core 41 and the back surface sheet 3, and the core wrap sheet | seat 42 has enclosed the cross section of the absorptive core 41 orthogonal to the longitudinal direction X of the diaper 1 over the perimeter. And the core wrap sheet | seat 42 is each joined to the skin opposing surface and non-skin opposing surface of the absorptive core 41 via the adhesive agent b. The skin facing surface of the constituent members of the diaper 1 (absorbent core 41, top sheet 2, back sheet 3, absorber 4 etc.) is a surface directed toward the wearer's skin when the diaper 1 is worn, and is non-skin The facing surface is a surface that is directed to the side opposite to the wearer's skin (usually the clothing side) when the diaper is worn.

  Moreover, the absorptive core 41 has the narrow part 41c which the width | variety reduced in the crotch part C, as shown in FIG.1 and FIG.2. The constricted part 41c is a part sandwiched between parts wider than the part in the longitudinal direction X of the diaper 1, and both side edges 41s and 41s of the constricted part 41c of the absorbent core 41 are shown in FIG. As shown, in the plan view of the absorbent body 4, a convex concave shape is formed inward in the width direction of the diaper 1, and more specifically, a circular arc shape is formed inward in the width direction of the diaper 1. ing. On the other hand, the core wrap sheet 42 described above has a rectangular shape in a plan view of the absorbent body 4, and a pair of laterally extending portions 43s extending from both side edges 41s and 41s of the constricted portion 41c of the absorbent core 41, 43. As shown in FIG. 1, the laterally extending portion 43 of the core wrap sheet 42 is outside the respective side edges 41 s and 41 s of the constricted portion 41 c within the range C1 having the constricted portion 41 c in the longitudinal direction X of the diaper 1. It is a part located in the direction.

The core wrap sheet 42 includes a first sheet portion 42 u that forms the upper surface of the side extension portion 43 and a side extension at each side extension portion 43, as shown in FIGS. 2 and 3. The second sheet portion 42d that forms the lower surface of the portion 43 is not joined. That is, in the present embodiment, as shown in FIG. 3, the entire region of the laterally extending portion 43 excluding the portion that forms the side edge 4 s of the absorber 4 is a non-joined region 43N.
The first sheet portion 42 u forms a part of the upper core wrap sheet 42 a that forms the skin facing surface of the absorbent body 4, and faces the non-skin facing surface of the top sheet 2. The second sheet portion 42 d forms a part of the lower core wrap sheet 42 b that forms the non-skin facing surface of the absorbent body 4, and faces the skin facing surface of the back sheet 3. The upper core wrap sheet 42a in the diaper 1 of the present embodiment is bonded to the top sheet 2 by the adhesive c over the entire width of the absorbent body 4 including the left and right first sheet portions 42u. On the other hand, the lower core wrap sheet 42b is joined to the back sheet 3 via the adhesive a in the central portion in the width direction of the absorbent body 4. In other words, the absorber 4 and the back sheet 3 are joined by the adhesive a at the narrow portion 41c or the central portion in the width direction of the absorber 4. And the adhesive agent a which joins between the absorber 4 and the back surface sheet 3 is distribute | arranged so that it may straddle both sheets connected in the connection part 42c mentioned above. That is, the connecting portion 42 c between the core wrap sheets is joined to the back sheet 3. It is preferable that the connection part 42c is joined to the back surface sheet 3 over the whole area of the diaper 1 in the width direction Y.
Further, the second sheet portion 42 d of the lower core wrap sheet 42 b is not joined to the back surface sheet 3, and the lower core wrap sheet 42 b is more than the side edge 41 s in the constricted portion 41 c of the absorbent core 41. A portion 44 that is located on the inner side and that is continuous with the second sheet portion 42 d has a portion 44 that is not joined to the backsheet 3.

  As shown in FIG. 2, the top sheet 2 in the diaper 1 is a back sheet opposite to the outer end Uo of the first sheet portion 42 u of the core wrap sheet 42 in the width direction Y of the diaper 1. 3 has a non-joined portion 21 that is not joined to the outer peripheral portion 3, and an outer joint portion 22 joined to the opposite back sheet 3 with an adhesive d on the outer side of the non-joined portion 21. In the diaper 1, the back sheet 3 is the “lower sheet” in the present invention.

  In the diaper 1, the adhesives a to d are hot-melt type water-insoluble adhesives, and have the same width as that shown in FIG. 2 and the entire length of the absorbent body 4 in the longitudinal direction X of the diaper. It is arranged. Moreover, the coating method of the adhesives a to d may be solid coating with a slot coater or the like, but pattern coating is preferable from the viewpoint of liquid permeability and air permeability. Examples of the coating pattern for pattern coating include spiral patterns, dot patterns, stripe patterns (striped patterns), lattice patterns, checkered patterns, and the like.

According to the diaper 1 of the present embodiment, the core wrap sheet 42 is joined to the portion adjacent to the constricted portion 41c of the absorbent core 41 with the first sheet portion 42u on the upper surface side and the second sheet portion 42d on the lower surface side. There is a laterally extending portion 43 that is not formed, and the core extending sheet 42 does not hinder the absorbent core 41 from absorbing liquid and swelling in the thickness direction as the laterally extending portion 43 extends. . And since the surface sheet 2 has the non-joining part 21 between the outer side joining parts 22, even if it joins the surface sheet 2 and the back surface sheet 3, the absorptive core 41 and the absorber 4 absorb liquid, and thickness Swelling in the direction is not inhibited.
As described above, according to the diaper 1 of the present embodiment, swelling inhibition of the absorbent core 41 and the absorbent body 4 by the core wrap sheet 42 and the top sheet 2 is suppressed, and the absorbent body including the water-absorbing polymer has sufficient absorbency. And excellent leakage resistance is obtained.

  Moreover, when the back surface sheet 3 has moisture permeability, since the surface sheet 2 has the non-bonding portion 21 between the outer surface bonding portion 22 and moisture discharge through the back surface sheet 3 is promoted, absorption is performed. It becomes a disposable diaper which is less likely to cause stuffiness even after liquid absorption of the body 4.

  Moreover, in the diaper 1 of this embodiment, as mentioned above, it has the connection part 42c of core wrap sheets between the absorptive core 41 and the back surface sheet 3, and the absorber 4 and the back surface sheet 3 are the same. Since the adhesive a that joins the gaps is disposed so as to straddle both sheets connected in the connecting portion 42c, even if the absorbent core 41 swells due to liquid absorption, separation of the sheets in the connecting portion 42c occurs. hard. In addition, both the sheets connected in the connection part 42c may be mutually laminated | stacked in the connection part 42c, and may be in the state which faced. Moreover, when laminated | stacked, the adhesive agent may interpose between both, and it does not need to intervene.

  Moreover, in the diaper 1 of this embodiment, since the 2nd sheet | seat part 42d is not joined with the back surface sheet 3 as mentioned above, when the back surface sheet 3 has moisture permeability, the moisture which arises from the absorber 4 is produced. The second sheet portion 42d and the back sheet 3 are efficiently diffused to the outside. Therefore, it becomes a disposable diaper which does not easily cause stuffiness even after absorption of the absorbent body 4. Further, a portion 44 that is located on the inner side of the side edge 41 s of the constricted portion 41 c of the absorbent core 41 in the core wrap sheet 42 and that is continuous with the second sheet portion 42 d is not joined to the back sheet 3. By having it, the discharge of moisture is further improved, and the disposable diaper is less prone to stuffiness.

From the viewpoint of ensuring that one or more of the effects described above are more reliably exhibited, the diaper 1 preferably has the following configuration.
The extension length L3 (length along the diaper width direction Y, see FIG. 3) of the side extension 43 is preferably 5% or more with respect to the total width L4 of the absorber 4 (see FIG. 1). Preferably, it is 8% or more, preferably 28% or less, more preferably 25% or less, preferably 5% or more and 28% or less, more preferably 8% or more and 25% or less. The extension length L3 of the lateral extension portion 43 is preferably 5 mm or more, more preferably 8 mm or more, preferably 30 mm or less, more preferably 27 mm or less, and preferably 5 mm or more and 30 mm or less. More preferably, it is 8 mm or more and 27 mm or less.
The extension length L3 of the side extension part 43 is the length from both side edges 41s of the absorbent core 41 to the side edges 4s of the absorbent body 4 formed from the core wrap sheet 42, and the width direction of the diaper The length along Y.

The preferable range of the length Ln (see FIG. 3) in the diaper width direction of the non-joining region 43N and the preferable range of the ratio of the length Ln to the entire width L4 of the absorber 4 are the extension length of the side extension portion 43. This is the same as the preferable range described above for the length L3.
The length Ln of the non-joining region 43N in the diaper width direction is preferably 10% or more, more preferably 50% or more, and still more preferably 90% with respect to the extension length L3 of the lateral extension portion 43. Also, it is preferably less than 100%.

  The length L1 (see FIG. 2) in the diaper width direction of the non-joint portion 21 of the topsheet 2 is preferably 3% or more, more preferably 4% or more with respect to the total width L4 (see FIG. 1) of the absorbent body 4. Moreover, it is preferably 18% or less, more preferably 15% or less, and preferably 3% or more and 18% or less, more preferably 4% or more and 15% or less. The length L1 of the non-joining portion 21 in the diaper width direction is preferably 3 mm or more, more preferably 4 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 3 mm or more and 20 mm or less. More preferably, it is 4 mm or more and 15 mm or less.

As for the diaper 1 of this embodiment, as shown in FIG. 2, although the adhesive agent a is distribute | arranged inside 41s of side edges of the absorptive core 41, in the disposable diaper of this invention, the absorptive core 41 of You may arrange | position over the width direction outer side with respect to 41 s of side edges, and may arrange | position to 4 s of side edges of the absorber 4. FIG.
The distance between the side edge 4s of the absorbent body 4 and the adhesive a (the length along the diaper width direction X) on each side in the longitudinal direction of the diaper is relative to the full width L4 of the absorbent body 4 (see FIG. 1). Preferably, it is 1% or more, more preferably 3% or more, preferably 35% or less, more preferably 33% or less, and preferably 1% or more and 35% or less, more preferably 3% or more. 33% or less. The adhesive a is the adhesive a that joins between the absorber 4 and the back sheet 3.
The distance between the side edge 41s of the absorbent core 41 and the adhesive a (the length along the diaper width direction) is preferably 0 with respect to the entire width of the absorbent core 41 (the length along the diaper width direction). % Or more, more preferably 2% or more, preferably 50% or less, more preferably 40% or less, and preferably 0% or more and 50% or less, more preferably 2% or more and 40% or less. .

  From the viewpoint of prevention of dampness, the core wrap sheet 42 is also joined to the back sheet 3 at a portion continuing inward from the side edge 41s in the constricted portion 41c of the absorbent core 41 and continuing to the second sheet portion 42d. It is preferable to have a non-exposed portion 44. The length L5 (see FIG. 2) along the diaper width direction X of the portion 44 is preferably 1% or more, more preferably 3% or more, with respect to the entire width L4 (see FIG. 1) of the absorber 4. Moreover, it is preferably 30% or less, more preferably 27% or less, preferably 1% or more and 30% or less, more preferably 3% or more and 27% or less.

  The extension length L3 of the lateral extension portion 43, the length Ln of the non-joining region 43N in the diaper width direction, the entire width L4 of the absorber 4, the length L1 of the non-joint portion 21 in the diaper width direction, and the absorber 4 The distance between the side edge 4s and the adhesive a, the distance between the side edge 41s of the absorbent core 41 and the adhesive a, the length L5 of the portion 44 in the diaper width direction, and the total width L4 of the absorbent core 41 Are measured at the minimum width portion (the position of the II-II line in FIG. 1) of the constricted portion 41c in the unfolded diaper.

Next, the disposable diaper of the 2nd-7th embodiment of this invention is demonstrated.
In 2nd-7th embodiment, a different point from the diaper 1 of 1st Embodiment is mainly demonstrated, and description is abbreviate | omitted about the same point. About the point which is not demonstrated especially, it can be set as the structure similar to the diaper 1 of 1st Embodiment including preferable structures, such as a dimension of each part, and a dimension ratio.

  In the disposable diaper 1A of the second embodiment (hereinafter also referred to as diaper 1A), as shown in FIG. 4, the core wrap sheet 42 of the absorbent body 4 is a separate upper core wrap sheet 42a and lower core wrap. The upper core wrap sheet 42a and the lower core wrap sheet 42b are joined to each other on both sides of the absorbent body 4 with an adhesive e. Also in the diaper 1 </ b> A, the core wrap sheet 42 includes a first sheet portion that forms an upper surface of the side extending portion 43 on a side extending portion 43 that extends from both side edges of the constricted portion 41 c of the absorbent core 41. It has the non-joining area | region 43N with which the 2nd sheet | seat part which forms the lower surface of the side extension part 43 is not joined, The non-joining area | region 43N of the absorptive core 41 is in the diaper width direction. It is adjacent to the constricted part 41c. Further, the top sheet 2 has a non-joining part 21 between the top sheet 2 and the outer joint part 22. Therefore, the effect similar to diaper 1 is show | played by diaper 1A.

  Also in the disposable diapers 1B to 1E of the third to sixth embodiments, as shown in FIGS. 5 to 8, the core wrap sheet 42 that wraps the absorbent core 41 has both side edges 41s in the constricted portion 41c of the absorbent core 41. , 41s has a non-joining region 43N in which the first sheet part 42u that forms the upper surface and the second sheet part that forms the lower surface are not joined to the laterally extending part 43, The non-bonding region 43N is adjacent to the constricted portion 41c of the absorbent core 41 in the diaper width direction.

As shown in FIG. 5, in the disposable diaper 1B of the third embodiment (hereinafter also referred to as diaper 1B), the core wrap sheet 42 is connected to the first sheet portion 42u and the first sheet portion 42u, respectively. It has the folding part 45 folded between the 2 sheet | seat parts 42d. Each folded portion 45 is formed by bending the core wrap sheet 42 at three locations. As the three folded portions, the upper folded portion 45a on the topsheet 2 side and the lower folded portion on the backsheet 3 side. It has the part 45c and the middle valley fold part 45b between them. Between the upper bent portion 45a and the lower bent portion 45c, a first sheet portion 42u that forms the upper surface of the side extending portion 43 and a second sheet portion 42d that forms the lower surface of the side extending portion 43. Between the first and second sheet portions 42u and 42d, and the regions between the upper bent portion 45a and the lower bent portion 45c are also bonded to each other. It has not been. Instead of this, either one between the upper bent portion 45a and the intermediate valley bent portion 45b or between the intermediate valley bent portion 45b and the lower bent portion 45c is used as a water-soluble adhesive. Thus, the first sheet portion 42u or the second sheet portion 42d facing each other may be joined.
According to the diaper 1B of the third embodiment, the extension margin of the laterally extending portion 43 is further increased by the folding portion 45, so that the swelling inhibition of the absorbent core 41 is further reliably suppressed, and the water-absorbing polymer or absorbent property is suppressed. Absorption performance inherent to the core is more reliably exhibited.

The disposable diaper 1C of the fourth embodiment (hereinafter also referred to as diaper 1C) has a folded portion 45 in the laterally extending portion 43 of the core wrap sheet 42, like the diaper 1B of the third embodiment. As shown in FIG. 6, in the diaper 1C, the position in the width direction Y of the diaper 1 is different between the upper bent portion 45a and the lower bent portion 45c. That is, in the diaper 1B of the third embodiment, as shown in FIG. 5, the positions of the upper bent portion 45a and the lower bent portion 45c coincide with each other in the width direction Y of the diaper. In the diaper 1C of the embodiment, as shown in FIG. 6, in each of the pair of laterally extending portions 43, the lower bent portion 45c is more outward in the width direction Y of the diaper than the upper bent portion 45a. Is located.
Like the diaper 1C, by positioning the lower bent portion 45c outward from the upper bent portion 45a, the length of the non-joint portion 21 of the topsheet 2 in the diaper width direction is shortened while being sideways. The extension allowance of the extension part 43 can be enlarged.
Moreover, in the diaper 1C, as shown in FIG. 6, the non-joining part 21 in the top sheet 2 is provided outside the outer end part Uo of the first sheet part 42u, and the top sheet 2 in the outside joining part 22 is provided. However, it is joined to the lower bent portion 45c in addition to the back sheet 3. Therefore, there is an advantage that the lower bent portion 45c located at the side edge of the absorbent body 4 can be prevented from floating and twisting and is not easily deformed.

  The disposable diaper 1D (hereinafter also referred to as diaper 1D) of the fifth embodiment shown in FIG. 7 is below the folding part 45 in each of the pair of laterally extending parts 43, similarly to the diaper 1C of the fourth embodiment. The side bent portion 45c is located outward in the width direction Y of the diaper than the upper bent portion 45a. Also in the diaper 1D, the lower bent portion 45c is positioned outward from the upper bent portion 45a, so that the length of the non-joined portion 21 of the topsheet 2 in the diaper width direction is shortened while extending laterally. The extension allowance of the output part 43 can be enlarged.

The core wrap sheet 42 in the disposable diaper 1E of the sixth embodiment shown in FIG. 8 (hereinafter also referred to as diaper 1E) is separate from the upper core wrap sheet 42a, which is a separate body, similarly to the diaper 1A of the second embodiment. The upper core wrap sheet 42a and the lower core wrap sheet 42b are joined to each other on both sides of the absorbent body 4 with an adhesive e. In the diaper 1E, the upper core wrap sheet 42a and the lower core wrap sheet 42b, which are separate bodies, have folding portions 46 and 47 in the side extending portions 43, respectively. Both folding parts 46 and 47 have an upper valley fold part 46b and a lower valley fold part 47b between the first sheet part 42u and the second sheet part 42d, and the width direction of the diaper. The connecting portion 42c between the two sheets 42a and 42b is provided outside the both valley folded portions 46b and 47b. Further, the adhesive d for forming the outer joint portion 22 of the top sheet 2 covers the end faces of the two sheets 42a and 42b laminated at the connecting portion 42c so that the connecting portion 42c is not easily peeled off. It is reinforced.
According to the diaper 1E, with such a configuration, the width of the connecting portion 42c can be widened while securing the allowance in the thickness direction of the absorbent body 4, and the swelling inhibition of the absorbent core 41 and the absorbent body 4 is suppressed. However, it is possible to prevent inconvenience such as leakage of the water-absorbing polymer due to peeling of the connecting portions between the sheets.

The disposable diaper (not shown) of the seventh embodiment is an embodiment of the second invention, and the space between the first sheet portion 42u and the second sheet portion 42d in the diaper 1 of the first embodiment is water-soluble. It has the structure which has the weak joining area | region joined by the adhesive agent of this, and has the structure similar to the diaper 1 other than that.
According to the disposable diaper of the seventh embodiment, when the absorbent body 4 absorbs the liquid, the bonding with the water-soluble adhesive is released, and thereby the absorbed absorbent core 41 and the absorbent body 4 swell. Furthermore, the core wrap sheet 42 does not inhibit the swelling. Moreover, also in the disposable diaper of 7th Embodiment, similarly to the diaper 1, the surface sheet 2 has the non-joining part 21 and the outer side joining part 22 of the outer side. Therefore, the same effect as the diaper 1 of 1st Embodiment is show | played also by the diaper of 7th Embodiment.
Examples of the water-soluble adhesive include acrylic, vinyl acetate, and polyvinyl alcohol. In addition, a hydrophilic adhesive may be used. As the hydrophilic adhesive, hot melt using a hydrophilic group-introduced polymer, polyether diol, polyether diamine, polyvinyl alcohol, polyethylene glycol, polypropylene glycol is blended or copolymerized with the polymer component. And those obtained by acid-modifying polymer components with carboxylic acid or the like.

The present invention is not limited to the above-described embodiments, and can be changed as appropriate.
For example, one or both of the three-dimensional gathers and the leg elastic members in the diapers 1, 1A to 1E can be omitted. In addition, the adhesive that joins the top sheet 2 and the absorbent body 4 may not extend over the entire width of the absorbent body 4, and the adhesive that joins the back sheet 3 and the absorbent body 4 It may extend over the entire width. Further, either or both of an adhesive that joins the skin facing surface of the absorbent core 41 and the core wrap sheet 42 and an adhesive that joins the non-skin facing surface of the absorbent core 41 and the core wrap sheet 42 are used. However, it may be coated in the same shape as the planar view shape of the constricted portion 41c.
The disposable diaper may be a pants-type disposable diaper instead of the unfolded disposable diaper.

This invention discloses the following disposable diapers further regarding embodiment mentioned above.
<1>
A disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having a ventral side part, a back side part and a crotch part located between them in the longitudinal direction,
The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. Are joined together.
The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet is formed on a side extending portion extending from both side edges of the constricted portion of the absorbent core. The first sheet portion forming the upper surface of the side extending portion and the second sheet portion forming the lower surface of the side extending portion have a non-bonded region that is not bonded;
In the width direction of the disposable diaper, the top sheet has a non-joined portion that is not joined to the opposite lower sheet outside the outer end portion of the first sheet portion, and is further outside the non-joined portion. The disposable diaper which has the outer junction part joined to the lower sheet | seat which opposes mutually.

<2>
A disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having a ventral side part, a back side part and a crotch part located between them in the longitudinal direction,
The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. Are joined together.
The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet is formed on a side extending portion extending from both side edges of the constricted portion of the absorbent core. The first sheet portion that forms the upper surface of the side extending portion and the second sheet portion that forms the lower surface of the side extending portion have a weakly bonded region bonded by a water-soluble adhesive. ,
In the width direction of the disposable diaper, the top sheet has a non-joined portion that is not joined to the opposite lower sheet outside the outer end portion of the first sheet portion, and is further outside the non-joined portion. The disposable diaper which has the outer junction part joined to the lower sheet | seat which opposes mutually.

<3>
<1> or <2>, wherein the core wrap sheet has a connection part between core wrap sheets between the absorbent core and the back sheet, and the connection part is joined to the back sheet. Disposable diapers described in 1.
<4>
The back sheet has moisture permeability;
The disposable diaper according to any one of <1> to <3>, wherein the second sheet portion of the core wrap sheet is not joined to the back sheet.
<5>
The core wrap sheet has a portion that is located inward from a side edge of the constricted portion of the absorbent core and that is not joined to the back sheet even in a portion continuous with the second sheet portion, The disposable diaper as described in <4>.

<6>
The core wrap sheet includes a folded portion in which a part of the core wrap sheet is folded between the first sheet portion and the second sheet portion in the lateral extension portion. The disposable diaper according to any one of <5>.
<7>
The folded portion has an upper bent portion on the top sheet side, a lower bent portion on the back sheet side, and an intermediate valley bent portion therebetween, and the lower bent portion is The disposable diaper according to <6>, wherein the disposable diaper is positioned outward in the width direction of the disposable diaper from the upper bent portion.
<8>
In the width direction of the disposable diaper, the non-joining portion in the top sheet is provided outside the outer end portion of the first sheet portion, and the top sheet in the outside joint portion is the lower bent portion. The disposable diaper according to <7>, wherein the disposable diaper is joined to the diaper.

<9>
The folded portion has an upper bent portion on the top sheet side, a lower bent portion on the back sheet side, and an intermediate valley bent portion therebetween.
A space between the upper bent portion and the lower bent portion is located between the first sheet portion and the second sheet portion, and any one of the first sheet portion and the second sheet portion. The disposable diaper according to <6>, wherein the region between the upper bent portion and the lower bent portion is not bonded to each other.
<10>
The core wrap sheet is a square or rectangular sheet, and the length along the longitudinal direction of the diaper is longer than the length of the absorbent core in the same direction, and wraps the entire absorbent core with one sheet. The disposable diaper according to any one of <1> to <9>.
<11>
Between the absorbent core and the back sheet, there is a connecting portion between core wrap sheets in which one side edge and the other side edge along the longitudinal direction of the diaper are laminated. The disposable diaper according to any one of <1> to <10>, wherein a cross section of the absorbent core perpendicular to the direction X is surrounded over the entire circumference.
<12>
The extension length L3 of the lateral extension portion is preferably 5% or more, more preferably 8% or more, and preferably 28% or less, more preferably, with respect to the total width L4 of the absorber 4. The disposable diaper according to any one of <1> to <11>, which is 25% or less.
<13>
The extension length L3 of the lateral extension portion is preferably 5 mm or more, more preferably 8 mm or more, and preferably 30 mm or less, more preferably 27 mm or less, <1> to <12> The disposable diaper according to any one of the above.

<14>
The length Ln of the non-bonded region in the diaper width direction is preferably 5% or more, more preferably 8% or more, and preferably 28% or less, more preferably, with respect to the total width L4 of the absorber 4. The disposable diaper according to any one of <1> to <13>, which is 25% or less.
<15>
The length Ln in the diaper width direction of the non-joined region is preferably 5 mm or more, more preferably 8 mm or more, and preferably 30 mm or less, more preferably 27 mm or less, <1> to <14> The disposable diaper according to any one of the above.
<16>
The length L1 in the diaper width direction of the non-joined portion of the top sheet is preferably 3% or more, more preferably 4% or more, and preferably 18% or less, with respect to the entire width of the absorber. The disposable diaper according to any one of <1> to <15>, more preferably 15% or less.
<17>
The length L1 in the diaper width direction of the non-joined portion of the topsheet is preferably 3 mm or more, more preferably 4 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, <1> The disposable diaper according to any one of to <16>.
<18>
The distance (the length along the diaper width direction) between the side edge of the absorbent body and the adhesive joining the absorbent body and the back sheet on both sides in the longitudinal direction of the diaper is: <1> to <17>, preferably 1% or more, more preferably 3% or more, and preferably 35% or less, more preferably 33% or less with respect to the total width L4 of the absorbent body 4. The disposable diaper according to any one of the above.

<19>
The distance (length along the diaper width direction) between the side edge of the absorbent core and the adhesive joining the absorbent body and the back sheet is the total width of the absorbent core (diaper <1> to <18, preferably 0% or more, more preferably 2% or more, and preferably 50% or less, more preferably 40% or less, with respect to the length in the width direction). > The disposable diaper of any one of>.
<20>
The core wrap sheet of the absorbent body is configured by combining an upper core wrap sheet and a lower core wrap sheet, which are separate bodies, and the upper core wrap sheet and the lower core wrap sheet of the absorbent body 4 The disposable diaper according to any one of the above items <1> to <19>, which is bonded to both sides through an adhesive.
<21>
The said weak junction area | region is a disposable diaper any one of said <1>-<20> adjacent to the said constriction part of the said absorptive core in a diaper width direction.
<22>
The length L5 along the diaper width direction X of the portion 44 that is not joined to the back sheet, which is in the portion continuous with the second sheet portion, is preferably 1% or more with respect to the total width L4 of the absorber. Preferably it is 3% or more, preferably 30% or less, more preferably 27% or less, and preferably 1% or more and 30% or less, more preferably 3% or more and 27% or less <6> The disposable diaper according to any one of to <20>.

1, 1A-1E disposable diaper 2 Top sheet 21 Non-joint part 22 Outer joint part 3 Back sheet 3a Leak-proof sheet 3b Exterior nonwoven fabric 4 Absorber 4s Absorber side edge 41 Absorbent core 41c Constricted part 42 Core wrap sheet 42u First 1 sheet part 42d 2nd sheet part 42c connecting part 43 side extension part 43N non-joining area 45 folding part 45a upper side folding part 45c lower side folding part 45b middle valley folding part

Claims (8)

A disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having a ventral side part, a back side part and a crotch part located between them in the longitudinal direction,
The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. Are joined together.
The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet is formed on a side extending portion extending from both side edges of the constricted portion of the absorbent core. The first sheet portion forming the upper surface of the side extending portion and the second sheet portion forming the lower surface of the side extending portion have a non-bonded region that is not bonded;
In the width direction of the disposable diaper, the top sheet has a non-joined portion that is not joined to the opposite lower sheet outside the outer end portion of the first sheet portion, and is further outside the non-joined portion. The disposable diaper which has the outer junction part joined to the lower sheet | seat which opposes mutually. A disposable diaper comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, and having a ventral side part, a back side part and a crotch part located between them in the longitudinal direction,
The absorbent body includes an absorbent core containing a water-absorbing polymer and a core wrap sheet that wraps the absorbent core, and the core wrap sheet has an adhesive on the skin facing surface and the non-skin facing surface of the absorbent core. Are joined together.
The absorbent core has a constricted portion with a reduced width at the crotch portion, and the core wrap sheet is formed on a side extending portion extending from both side edges of the constricted portion of the absorbent core. The first sheet portion that forms the upper surface of the side extending portion and the second sheet portion that forms the lower surface of the side extending portion have a weakly bonded region bonded by a water-soluble adhesive. ,
In the width direction of the disposable diaper, the top sheet has a non-joined portion that is not joined to the opposite lower sheet outside the outer end portion of the first sheet portion, and is further outside the non-joined portion. The disposable diaper which has the outer junction part joined to the lower sheet | seat which opposes mutually.   The said core wrap sheet | seat has a connection part of core wrap sheets between the said absorptive core and the said back surface sheet, and this connection part is joined to the said back surface sheet. Disposable diapers. The back sheet has moisture permeability;
The disposable diaper according to any one of claims 1 to 3, wherein the second sheet portion of the core wrap sheet is not joined to the back sheet.   The core wrap sheet has a portion that is located on the inner side of the side edge of the constricted portion of the absorbent core and that is not joined to the back surface sheet in a portion continuous with the second sheet portion. Item 5. A disposable diaper according to item 4.   The said core wrap sheet | seat has the folding part by which a part of this core wrap sheet | seat is folded between the 1st sheet | seat part and the 2nd sheet | seat part in the said side extension part. The disposable diaper of any one of these.   The folded portion has an upper bent portion on the top sheet side, a lower bent portion on the back sheet side, and an intermediate valley bent portion therebetween, and the lower bent portion is The disposable diaper according to claim 6, which is located outward in the width direction of the disposable diaper from the upper bent portion. In the width direction of the disposable diaper, the non-joining portion in the top sheet is provided outside the outer end portion of the first sheet portion, and the top sheet in the outside joint portion is the lower bent portion. The disposable diaper of Claim 7 currently joined to.

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