JP2012125353A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper in which air permeability and fitting of a side panel are excellent and stretchability of the side panel is hardly damaged even when strong tensile force is applied.SOLUTION: The disposable diaper 1 includes: an absorbent body including an absorber; and stretch side panels extending from both side edges of the absorbent body. The side panel 3 has a stretch part 30 where a plurality of stretch members are separately arranged between two sheets of nonwoven fabric, and has a tab 4 which has a fixing part and is provided on a distal end part of the side panel. The stretch part 30 has: a portion which is positioned in a range H1 having the tab 4 in a direction (Y direction) crossing the extending direction of the side panel and which is a high stretch stress part Ga having high stretch stress; and a portion which is positioned closer to crotch part side than the high stretch stress part in the same direction (Y direction) and which is a low stretch stress part Gb having the stretch stress lower than that in the high stretch stress part Ga.

Description

  The present invention relates to a disposable diaper.

  Conventionally, in a rectangular absorbent main body including an absorbent body, a deployable type in which a stretchable side panel material extending and contracting in the width direction of the absorbent main body is attached to a portion disposed on the wearer's back side when worn. There are known disposable diapers (see Patent Documents 1 and 2). This type of disposable diaper can be manufactured by adding the side panel material in a separate process from the absorbent main body and adding it to the absorbent main body. Waste generated from the material can be suppressed, which is excellent in terms of environment and cost.

  By the way, as for the human figure, the abdomen protrudes forward and the dorsal side is recessed. Furthermore, below these portions, the heel portion protrudes rearward, the base portion of the leg extends sideways, and the width increases. Therefore, in the case of a disposable diaper having a side panel that expands and contracts uniformly as a whole, when the side panel is pulled and the diaper is attached, the diaper does not fit into a body shape having three-dimensional unevenness, There is a tendency for a gap to be formed in a slightly depressed portion around the waist.

  Patent Document 1 describes that the tensile stress at the time of elastic deformation of a part of the side panel in the extending direction is made weaker than the tensile stress at the time of elastic deformation in other portions by cutting the elastic member or the like. However, even if a plurality of regions having different tensile stresses at the time of elastic deformation are provided in the extending direction of the side panel, the problem that gaps are likely to occur around the waist of the back is not solved.

  Patent Document 2 describes an absorbent article having a stretchable region containing an elastomer that recovers slowly. However, Patent Document 2 does not describe any configuration that does not cause a gap around the waist of the back.

JP 2009-072472 A Special table 2008-526386

  Accordingly, an object of the present invention is to provide a disposable diaper that is less likely to have a gap on the back side of the wearer and has excellent fit to the body.

  The present invention is a disposable diaper comprising an absorbent main body including an absorbent body and stretchable side panels extending from both side edges of the absorbent main body, and the side panel includes a plurality of side panels between two nonwoven fabrics. The elastic member of the book has a stretchable part that is spaced apart, and a tab having a fastening part is provided at the tip, and the stretchable part is in the crossing direction intersecting the extending direction of the side panel. The portion located in the area having the tab is a high elongation stress portion having a high elongation stress, and the portion located on the crotch part side in the same direction is extended more than the high elongation stress portion. The present invention provides a disposable diaper having a low elongation stress portion with low stress.

  According to the disposable diaper of the present invention, a gap is hardly generated on the back side of the wearer, and the fit to the body is excellent.

FIG. 1: is the expansion | deployment top view which looked at the disposable diaper which is 1st Embodiment of this invention from the surface sheet side. FIG. 2 is a perspective view showing a wearing state of the disposable diaper shown in FIG. 1. FIG. 3 is an enlarged plan view showing a side panel of the disposable diaper shown in FIG. 1 and the vicinity thereof. FIG. 4 is an end view (contracted state) taken along the line IV-IV in FIG. FIG. 5 is a schematic diagram of the wearing state of the diaper of FIG. 1 viewed from the side. FIG. 6 is an enlarged plan view (corresponding to FIG. 3) showing the side panel and the vicinity thereof in the second embodiment of the present invention. FIG. 7 is an enlarged plan view (corresponding to FIG. 3) showing the side panel and the vicinity thereof in the third embodiment of the present invention.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
As shown in FIG. 1, the disposable diaper 1 according to the first embodiment of the present invention includes an absorbent main body 2 including an absorbent body 23, and stretchable side panels 3 extending from both side edges of the absorbent main body 2. 3 is provided.

  As shown in FIG. 1, the absorbent main body 2 includes a liquid-permeable top sheet 21, a liquid-impermeable or water-repellent back sheet 22, and a liquid-retaining property interposed between the two sheets 21 and 22. And an absorber 23. As shown in FIG. 1, the absorbent main body 2 includes a top sheet 21 that forms the inner surface of the diaper 1 and a back sheet 22 that forms the outer surface of the diaper 1, with an absorber 23 interposed between the two sheets 21 and 22. It is formed by joining. The absorbent main body 2 is provided with three-dimensional guard forming sheets 24 and 24 along both longitudinal sides thereof. The three-dimensional guard forming sheet 24 is fixed to the top sheet 21 and the back sheet 22 extending from the side edge of the top sheet at both longitudinal sides of the absorbent main body 2. Each three-dimensional guard forming sheet 24 has a three-dimensional guard-forming elastic member 25 along the edge in the vicinity of the inner edge in the width direction (X direction) of the absorbent main body 2. Due to the contraction force of the elastic member 25, a portion having a predetermined width from the edge is separated from the topsheet 21 to form a three-dimensional guard. Moreover, the elastic member 26 for leg gather formation is distribute | arranged to the part distribute | arranged around the leg of the longitudinal direction both sides of the absorptive main body 2. At the time of wearing, a leg gather is formed by the contraction of the elastic member 26 and fits well around the legs.

The absorbent main body 2 has, when worn, a vertically long shape having an abdominal part A located on the abdomen side of the wearer, a back side part B located on the back side, and a crotch part C located on the crotch part. The side panels 3 and 3 extend from left and right edges of the absorbent main body 2 in the back side B in a direction (X direction) orthogonal to the longitudinal direction of the absorbent main body 2.
Further, the side panels 3 and 3 are provided with tabs 4 with fastening portions 41 on the leading ends in the extending directions (X directions). On the other hand, a landing zone 5 for fastening the fastening part 41 is provided on the outer surface of the ventral side A of the diaper 1. When the diaper 1 is worn, the tab 4 is pulled by hand, and the tab 4 2 is pressed against the landing zone 5 so that the tab 4 is fixed to the landing zone 5 and attached to the wearer. The tab 4 includes a tape base material 42 and a male member of a mechanical hook-and-loop fastener that is bonded to the tape base material 42 to form a fastening portion 41.

  As shown in FIG. 1, the diaper 1 is formed symmetrically with respect to the longitudinal center line CL of the absorbent main body 2. Therefore, the configuration of the side panels 3 and 3 will be mainly described with respect to the configuration of the left side panel in FIG. 1, but the configuration of the right side panel has the same configuration except that it is bilaterally symmetric.

  As shown in FIG. 3, the side panel 3 has a rectangular shape in a state where the side panel 3 is expanded in a planar shape. Moreover, as shown in FIG.3 and FIG.4, the side panel 3 has the two nonwoven fabrics 31 and 32 and the several elastic member 33 arrange | positioned among them. Each of the elastic members 33 extends along the extending direction (X direction) of the side panel 3 that is the same as the width direction of the absorbent main body 2, and a plurality of the elastic members 33 are orthogonal to the extending direction. They are arranged at substantially equal intervals in the (Y direction). Further, the extending direction of the side panel 3 along the width direction of the absorbent main body 2 is also simply referred to as the X direction, and the direction intersecting the extending direction of the side panel is also simply referred to as the Y direction.

  The plurality of elastic members 33 arranged on the side panel 3 form the expansion / contraction part 30 that expands and contracts in the X direction on the side panel 3. The stretchable portion 30 may extend over the entire length of the side panel 3 in the X direction, but in this embodiment, the portions excluding a predetermined width at both ends in the X direction of the side panel 3 are the stretchable portions 30. . The stretchable portion 30 is stretched in the X direction of the side panel 3 by the elastic stretching force of the elastic member 33.

As shown in FIG. 3, the stretchable portion 30 of the side panel 3 in the first embodiment is located in a range H <b> 1 having tabs 4 in the intersecting direction (Y direction) that intersects the extending direction (X direction) of the side panel 3. The portion to be (shaded portion in FIG. 3) is a high elongation stress portion Ga having a high elongation stress, and the portion located on the crotch C side than the high elongation stress portion Ga in the same direction (Y direction) The low elongation stress portion Gb has a lower elongation stress than the high elongation stress portion Ga. The high extension stress portion Ga and the low extension stress portion Gb are a portion having a relatively high extension stress and a portion having a low extension stress when the two are compared.
Further, the “elongation stress” is a load at the time of 100% elongation per unit length of the side panel 3 in the Y direction, and is preferably obtained by the following method.

<Method for measuring elongation stress>
The elongation stress was obtained by a tensile test using an Shimadzu autograph. The test piece was cut out from the diaper 1 together with the part where the side panel was attached to the main body (main body attachment part), and the length of the diaper in the X direction was the total length of the side panel, and the length (width) in the Y direction was 25 mm. Got. The non-stretchable region on the tape attachment side of the side panel 3 and the main body attachment portion of the test piece were gripped with a chuck and extended at a tensile speed of 300 mm / min. Side panel design dimensions from the length of the naturally contracted state (same as the dimensions when flattened in a state where the influence of the elastic member is completely removed (within the range where the nonwoven fabric constituting the side panel 3 is not torn) )), The load (full scale: 50 N) when extended to 100% was determined, and this was taken as the load at 100% extension per unit length (25 mm) in the Y direction.

  When it demonstrates in detail about the side panel 3 in 1st Embodiment, as shown in FIG. 3, the side panel 3 is between the two nonwoven fabrics 31 and 32 in the front-end | tip 3a side of the extension direction (X direction). However, it has the front-end | tip fixing | fixed part 35 continuously joined along the Y direction, and between the two nonwoven fabrics 31 and 32 is set to the Y direction at the base end 3b side of the extension direction (X direction). It has the base end side fixing | fixed part 37 joined continuously along. The elastic members 33 arranged on the side panel 3 are all arranged so as to extend between the distal end side fixing portion 35 and the proximal end side fixing portion 37, and the distal end side fixing portion 35 and the proximal end are arranged. Each of the side fixing portions 37 is fixed between the nonwoven fabrics 31 and 32 via adhesives 35A and 37A.

And in the side panel 3 in this embodiment, between the front end side fixing | fixed part 35 and the base end side fixing | fixed part 37 in the Y direction becomes the expansion / contraction part 30 which expands-contracts in a Y direction, and this expansion / contraction part 30 The two non-woven fabrics 31 and 32 are fused at a large number of dispersedly fused portions 39 and the elastic member 33 is arranged so as not to pass through the fused portions 39. It becomes the flexible expansion-contraction part 38 which is.
More specifically, a large number of dot-like fused portions 39 are formed between the nonwoven fabric 31 and 32 by heat embossing between the distal end side fixed portion 35 and the proximal end side fixed portion 37. These dot-like fused portions 39 are dispersed in the X direction and Y direction of the side panel 3. Further, the dot-like fusion part 39 forms a fusion part row S in which a plurality (11 in the illustrated example) of dot-like fusion parts 39 are arranged in series in the Y direction. S is formed in a plurality of rows (six rows in the illustrated example) in the X direction.

  In the stretchable portion 30 that is the flexible stretchable portion 38, all of the plurality of elastic members 33 disposed on the side panel are disposed so as to pass between the dot-shaped fusion portions 39, 39 adjacent in the Y direction. Each elastic member 33 is arranged so as not to pass through the dot-shaped fusion part 39. Therefore, these elastic members 33 are not joined to any of the nonwoven fabrics 31 and 32 between the distal end side fixing portion 35 and the proximal end side fixing portion 37. However, the non-woven fabrics 31 and 32 are in strong contact with the elastic member 33 between the adjacent fused portions 39 and 39 in the fused portion row S as compared with other portions of the stretchable portion 30.

  The elastic member 33 is coated on one of the nonwoven fabrics 31 and 32 with the adhesives 35A and 37A for forming the distal end side fixing portion 35 and the proximal end side fixing portion 37, and then on the coated portion. An elastic member is arranged in an extended state, and the other non-woven fabric is arranged on the elastic member while maintaining the extended state, and then fixed integrally between the non-woven fabrics 31 and 32 by pressurizing them integrally. Has been. In addition, the dot-shaped fusion part 39 is formed by performing hot embossing after fixing the elastic member 33 between the nonwoven fabrics 31 and 32.

The side panel 3 in the diaper 1 of the first embodiment has an expansion rate of the elastic member 33 when the elastic member 33 arranged in the range H1 having the tabs 4 in the Y direction is arranged. By making it higher than the elongation rate of the elastic member 33 at the time of arranging the elastic member 33 arranged in the range H2 not having the tab 4 located on the C side, the high elongation stress portion Ga and the low elongation stress portion Gb described above. Is formed.
Therefore, since it is not necessary to use a plurality of types of elastic members of different types and thicknesses in forming the high extension stress portion Ga and the low extension stress portion Gb on the side panel 3, it is possible to reduce the burden of material management and the manufacturing cost. From the viewpoint of the above. However, it is also possible to use elastic members of different types and thicknesses for the high elongation stress portion Ga and the low elongation stress portion Gb.

When the diaper 1 of the first embodiment is worn on the wearer, the tab 4 is pulled against the landing zone 5 in a state where the tab 4 is pulled by hand and the side panel 3 is extended.
According to the diaper 1 of the present embodiment, since the portion located in the range H1 having the tab 4 in the stretchable portion 30 is the high elongation stress portion Ga, simply pulling the tab 4 and attaching the diaper 1 As shown in FIG. 5, the contraction force of the side panel 3 can be concentratedly applied to a portion of the back side portion B that contacts the recessed portion P of the wearer's back. Therefore, a gap between the wearer's skin and the diaper is unlikely to occur in the recessed portion P of the wearer's back.

  Further, the side panel 3 has a portion H2 positioned below (in the crotch portion C side) the range H1 having the tab 4, and the low elongation stress portion having a lower elongation stress than the high elongation stress portion Ga in the portion H2. Since it has Gb, it is not necessary to apply unnecessary pulling force around the wearer's leg, and it is possible to prevent the mark from being attached.

From the viewpoint of preventing a gap from occurring on the wearer's back side, the high elongation stress portion Ga has an elongation stress per 25 mm in length in the Y direction of the side panel 3 measured by the method for measuring an elongation stress. 1.3N to 3.5N, particularly preferably 2.0N to 3.5N, and the low elongation stress portion Gb has a suitable fit without overtightening the wearer's legs. The elongation stress measured by the same measurement method per 25 mm in the length of the side panel 3 in the Y direction is preferably 0.3N to 2.5N, particularly preferably 0.5N to 2.0N.
In addition, from the viewpoint of preventing the formation of a gap around the leg while preventing the gap from being generated, the elongation stress of the high elongation stress portion Ga is the ratio (the former / the latter) of the low elongation stress portion Gb to the expansion stress. 1.3 to 3.0 times, particularly preferably 1.4 to 2.5 times.

Further, as in the present embodiment, when the elastic members 33 are fixed at different elongation rates to form the high elongation stress portion Ga and the low elongation stress portion Gb, the elastic members 33 are arranged in the high elongation stress portion Ga. The elongation ratio of the elastic member 33a is 2.0 times to 4.0 times, particularly 2.5 times to 3.5 times, from the viewpoint of ease of pulling at the time of wearing and fit around the stomach. Preferably, the stretch rate of the elastic member 33b disposed in the low elongation stress portion Gb is 1.1 to 3.0 times, particularly 1.2 to 2.5 times. It is preferable from the point.
Further, the elongation ratio of the elastic member 33a disposed in the high elongation stress portion Ga is such that the ratio (the former / the latter) to the elongation ratio of the elastic member 33b disposed in the low elongation stress portion Gb is 1.3 to 3.0. In particular, it is preferably 1.4 to 2.5.
It is preferable that 3 to 10, particularly 4 to 8 elastic members are arranged in the high elongation stress portion Ga, and 1 to 9, particularly 2 to 8 elasticity members are also provided in the low elongation stress portion Gb. It is preferable that the members are arranged.

The elongation rate of the elastic member of each part is calculated | required by the following method.
<Method for measuring elongation rate of elastic member>
On the side panel in the contracted (natural length) state, two marks are made at predetermined intervals in the X direction. Next, the side panel is extended until it reaches the design dimension (same as the dimension when it is spread in a flat state with no influence of the elastic member), and the distance between the marks is measured. From the measured values before and after the expansion, the expansion magnification is obtained by the following formula.
[Elongation time interval] / [Retraction time interval] = Elongation rate (times)

  Further, from the viewpoint of preventing a gap from occurring on the wearer's back side, the distance L1 from the upper end 3c of the side panel 3 to the tab 4 is 0 to 30% of the total length L of the side panel 3 in the Y direction, particularly 5 The distance L2 from the lower end 3d of the side panel 3 to the tab 4 is preferably 30 to 60%, particularly preferably 35 to 55% of the total length L in the Y direction of the side panel 3. From the same viewpoint, the distance L2 is preferably larger than the distance L1, and the difference (L2−L1) between the distance L2 and the distance L1 is 10 to 55% of the total length L, particularly 15 to 50. % Is preferred.

Further, the total length L in the Y direction of the side panel 3 is preferably 15 to 25%, particularly preferably 16 to 20%, of the total length in the Y direction (measured along the center line CL) of the absorbent main body 2. The distance L3 from the edge 2b on the side in the longitudinal direction of the main body 2 to the side panel 3 is preferably 0 to 2.5 cm, particularly preferably 0.5 to 2.0 cm.
The total length L of the side panel 3 in the Y direction, the distances L1 and L2 are measured at the position of the distal end 3a of the side panel 3, and the distance L3 is measured at the position of the base end 3b of the side panel 3.
The dimensions and the like of each part of the side panel material are the same as the dimensions when the elastic member such as an elastic member is extended and the side panel is expanded in a flat shape without any influence of the elastic member. Measured in a state expanded to.

Further, from the viewpoint of more reliably obtaining one or more effects as described above, the length L4 (see FIG. 3) of the stretchable portion 30 in the X direction is the total length in the extending direction (X direction) of the side panel 3. It is preferable that it is 65 to 95% with respect to L5 (refer FIG. 3), and it is more preferable that it is 75 to 90%.
Moreover, it is preferable that the high extension stress part Ga and the low extension stress part Gb have the same length in the X direction.

  Further, the fusion part 39 formed in the stretchable part 30, the high extension stress part Ga, and the low extension stress part Gb includes a plurality of fusion part rows S in the X direction in which a plurality of fusion parts 39 are arranged in series in the Y direction. Forming a line. For this reason, when the elastic member 33 contracts, the two nonwoven fabrics 31 and 32 between the fused portion rows S are easily deformed into a convex cross section in a direction away from the elastic member 33, and a plurality of elastic members 33 are formed. It is easy to form the flange 34 extending in the Y direction across the surface. Therefore, in the stretchable part 30, the high extension stress part Ga, and the low extension stress part Gb, the part that hits the wearer's skin is flexible, and the touch that hits the side part of the wearer, the legs, and the like is also excellent.

The constituent material of the diaper 1 is demonstrated.
As the tape base material 42 of the nonwoven fabrics 31 and 32 and the tab 4 constituting the side panel 3, various nonwoven fabrics and the like conventionally used for absorbent articles such as disposable diapers and sanitary napkins are used without particular limitation. Can do.
As the surface sheet 21, the back sheet 22, and the absorbent body 23 constituting the absorbent main body 2, those conventionally used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. . For example, a hydrophilic and liquid-permeable non-woven fabric can be used as the top sheet 21, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a non-woven fabric is used as the back sheet 22. be able to. As the absorbent body 23, an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held therein, a core wrap made of water-permeable thin paper or non-woven fabric. What was covered with the sheet | seat etc. can be used. As the three-dimensional guard forming sheet 24 constituting the three-dimensional guard, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

As the elastic member 33, the elastic member 25 constituting the three-dimensional guard, and the leg elastic member 26, natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene acrylate-ethylethylene, etc. A thread-like or string-like elastic member made of an α-olefin copolymer or the like can be used. As the thread-like or string-like elastic member, in addition to a circular or square cross section, a narrow band shape such as an elliptical or rectangular cross section can be used, and a multifilament type can also be used. .
The width (or diameter) of the elastic member 33 is, for example, 0.1 to 1 mm, and preferably 0.2 to 0.8 mm.
As the tab 4, a member obtained by attaching a hook member of a mechanical fastener to one surface of a tape base material such as a nonwoven fabric by heat fusion, an adhesive, or the like can be used.

  Next, the disposable diaper of other embodiment of this invention is demonstrated with reference to FIG.6 and FIG.7. The disposable diaper of other embodiment differs in the structure of a side panel from 1st Embodiment. In other embodiments, differences from the first embodiment will be mainly described, and description of similar points will be omitted. For the points not particularly mentioned, the description related to the first embodiment is applied as appropriate including the preferable configuration.

In the side panel 3A in the diaper of the second embodiment, as shown in FIG. 6, in the entire region from P1 to P2 in the X direction of the side panel 3A, between the two nonwoven fabrics 31 and 32 is bonded by an adhesive (not shown). The range indicated by reference numeral 30A in the drawing is an expansion / contraction portion 30A that expands and contracts in the X direction.
As shown in FIG. 6, the stretchable part 30 </ b> A in the second embodiment has a portion located in the range H <b> 1 having the tab 4 in the direction (Y direction) intersecting the extending direction (X direction) of the side panel 3. The elastic members 33a are arranged at a relatively narrow pitch, and the portion is a high extension stress portion Ga having a high extension stress. On the other hand, an elastic member is arranged at a pitch wider than that of the high elongation stress portion Ga in the portion located on the crotch portion C side with respect to the high elongation stress portion Ga in the same direction (Y direction). The low elongation stress portion Gb has a lower elongation stress than the portion Ga.
Also in the second embodiment, it is not necessary to use a plurality of types of elastic members of different types and thicknesses in forming the high extension stress portion Ga and the low extension stress portion Gb on the side panel 3A, so the burden of material management And from the viewpoint of reducing manufacturing costs. However, it is also possible to use elastic members of different types and thicknesses for the high elongation stress portion Ga and the low elongation stress portion Gb.

  According to the diaper of the second embodiment, in the stretchable portion 30A, the portion located in the range H1 having the tab 4 in the Y direction of the side panel 3 is the high elongation stress portion Ga, while the range H1 having the tab 4 The diaper of the first embodiment has a portion H2 located below (in the crotch C side) and the portion H2 is a low elongation stress portion Gb having a lower elongation stress than the high elongation stress portion Ga. The same effect is produced.

When the high extension stress portion Ga and the low extension stress portion Gb are formed by changing the arrangement pitch in the Y direction when fixing the elastic member 33 as in the present embodiment, the elastic members 33 are arranged in the high extension stress portion Ga. The arrangement pitch of the elastic members 33a is such that the ratio (the former / the latter) to the arrangement pitch of the elastic members 33b arranged in the low elongation stress portion Gb is 0.1 to 0.6, particularly 0.2 to 0.5. Preferably there is. As for the pitch of the elastic member, the distance between the same positions of the elastic member in the Y direction (such as the center position in the Y direction) is measured.
It is preferable that 3 to 12, especially 4 to 10 elastic members are disposed in the high elongation stress portion Ga, and 1 to 8, particularly 2 to 6 elasticity are provided in the low elongation stress portion Gb. It is preferable that the members are arranged.

In the side panel 3B in the diaper of the third embodiment, as shown in FIG. 7, a portion located in a range H1 having a tab 4 in a direction (Y direction) intersecting the extending direction (X direction) of the side panel 3B. Is provided with an elastic member 33a having a relatively large thickness, and this portion is a high elongation stress portion Ga having a high elongation stress. On the other hand, an elastic member 33b having a thickness relatively smaller than that of the high elongation stress portion Ga is disposed in a portion located on the crotch portion C side with respect to the high elongation stress portion Ga in the same direction (Y direction). The low elongation stress portion Gb has a lower elongation stress than the high elongation stress portion Ga.
As in the side panel 3 of the first embodiment, the side panel 3B of the third embodiment has a Y direction between the distal end side fixing portion 35 and the proximal end side fixing portion 37 in the extending direction (Y direction). The entire stretchable part 30 is fused at a large number of fusion parts 39 distributed between the two nonwoven fabrics 31 and 32 and the elastic member 33 is The flexible stretchable portion 38 is arranged so as not to pass through the fused portion 39.

  According to the diaper of the third embodiment, the portion of the stretchable portion 30 located in the range H1 having the tab 4 in the Y direction of the side panel 3 is the high elongation stress portion Ga, while the range H1 having the tab 4 The diaper of the first embodiment has a portion H2 located below (in the crotch C side) and the portion H2 is a low elongation stress portion Gb having a lower elongation stress than the high elongation stress portion Ga. The same effect is produced.

  When the thickness of the elastic member 33 is varied to form the high extension stress portion Ga and the low extension stress portion Gb as in the present embodiment, the width of the elastic member 33a disposed on the high extension stress portion Ga or As for the diameter, the ratio (the former / the latter) to the width or diameter of the elastic member 33b disposed in the low elongation stress portion Gb is preferably 1.5 to 10, particularly 2 to 8.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to said each embodiment, A various change is possible.

  For example, the stretchable portions 30 and 30A of the side panel extend per unit length on the upper end 3c side from the range H1 having the tab 4 in the direction (Y direction) intersecting the extending direction (X direction) of the side panel. The stress may have a second low elongation stress portion that is lower than the high elongation stress portion Ga in the range H1 having the tab 4. However, the length in the Y direction of the second low elongation stress portion is preferably shorter than the length in the Y direction of the low elongation stress portion Gb located on the crotch part side from the high elongation stress portion Ga, more preferably 50%. Hereinafter, it is more preferably 20% or less.

The stretchable part 30 may be a flexible stretchable part 38 instead of the whole in the Y direction.
The number of the fused part rows S formed on the flexible stretchable part 38 is also 3 to 12 or 13 or more (for example, 5 to 20 or the like) instead of the 6 shown in FIGS. You can also. Further, the number of dot-like fused portions 39 constituting the fused portion row S can also be appropriately determined according to the number of elastic members 33 arranged on the side panel. Moreover, the shape of the dot-shaped fusion | melting part 39 can be made into appropriate shapes, such as a rectangle, an ellipse, a circle, an ellipse, a rhombus, a triangle, a pentagon.
Instead of the fused part row S, a line or a band-like joint part in which the two nonwoven fabrics are continuously joined in the Y direction by an adhesive or heat seal may be provided.
Moreover, the number of the elastic members 33 arranged on one side panel can be changed as appropriate, for example, 5 to 20, preferably about 10 to 15.

Further, the fastening portion of the tab 4 may be an adhesive portion to which an adhesive is applied instead of the male member of the mechanical surface fastener. The landing zone for fastening the fastening portion 41 made of the male member of the mechanical hook-and-loop fastener may be formed by joining a female member of the mechanical hook-and-loop fastener to the outer surface of the backsheet 22. The outer surface may be made of a non-woven fabric with high engagement properties, and the predetermined area may be a landing zone.
Further, the fused portion 39 may be formed by ultrasonic embossing or high-frequency embossing in addition to hot embossing. Further, the distal end side joint portion and the proximal end side joint portion may also be formed by heat embossing, ultrasonic embossing, fusion by high frequency embossing, or the like instead of the adhesive. Moreover, the junction part by combined use, such as an adhesive agent and hot embossing, may be sufficient.

FIG. 4 shows an example in which the tape base material 42 of the tab 4 is fixed between the nonwoven fabrics 31 and 32 via an adhesive 42A. The tape base 42 may be fixed to the outer surface of the non-woven fabric 32 (the surface not the non-woven fabric 31) by an adhesive or heat-sealing. .
The fixing of the side panel 3 to the absorbent main body 2 is the same, and FIG. 4 shows an example in which the side panel is fixed between the solid guard forming sheet 24 and the back sheet 22 with an adhesive 27. However, the side panel may be fixed between the sheets constituting the absorbent main body 2 by heat fusion or the like, and the side panel is on the outer surface (the surface not the three-dimensional guard forming sheet 24 side) side of the back sheet 22. Further, it may be joined by an adhesive or heat fusion.
The disposable diaper may not have a three-dimensional guard, and the side panel may be fixed between the top sheet and the back sheet or on the top sheet at both sides of the absorbent main body 2.

  In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted for each other.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 24 Solid guard forming sheet 3, 3A, 3B Side panel 3a Tip 3b Base end 30, 30A Stretchable portion 31, 32 Non-woven fabric 33 Elastic member 35 Tip side joining Part 36 Non-joint part 37 Base end side joint part 38 Flexible stretchable part 39 Dot-shaped fused part (fused part)
Ga High elongation stress part Gb Low elongation stress part 4 Tab 41 Fastening part 42 Tape base material 5 Landing zone

Claims (5)

A disposable diaper comprising an absorbent main body including an absorbent body and stretchable side panels extending from both side edges of the absorbent main body,
The side panel has a stretchable part in which a plurality of elastic members are spaced from each other between two nonwoven fabrics, and a tab having a fastening part is provided at the tip part.
In the stretchable portion, the portion located in the range having the tabs in the crossing direction intersecting the extending direction of the side panel is a high elongation stress portion having a high elongation stress, and the high elongation stress portion in the same direction. The disposable diaper in which the part located in the crotch part side is a low extension stress part whose extension stress is lower than the high extension stress part.   The elongation rate of the elastic member arranged in the range having the tabs in the intersecting direction of the side panel is higher than the elongation rate of the elastic member arranged on the crotch part side than the range, thereby the high elongation stress. The disposable diaper of Claim 1 in which the part and the said low elongation stress part are formed.   When the pitch of the elastic members arranged in the range having the tabs in the cross direction of the side panel is narrower than the pitch of the elastic members arranged on the crotch part side than the range, the high elongation stress portion and The disposable diaper of Claim 1 in which the said low elongation stress part is formed.   The thickness of the elastic member arranged in the range having the tabs in the intersecting direction of the side panel is larger than the thickness of the elastic member arranged on the crotch part side than the range, whereby the high elongation stress portion The disposable diaper according to claim 1, wherein the low elongation stress portion is formed.   The side panel has, on the leading end side in the extending direction, a leading end side fixing portion in which the two nonwoven fabrics are continuously joined along a direction intersecting the extending direction. A base end side fixing portion continuously joined along a direction intersecting the extending direction between the two nonwoven fabrics on the base end side in the direction, the tip end fixing portion and the base end Between the side fixing portion, the two non-woven fabrics are fused in a large number of dispersedly fused portions, and the elastic member is arranged so as not to pass through the fused portions. The disposable diaper of any one of Claims 1-4 which has the flexible elastic part which has.

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