JP2015109900A - Flexible structure of absorbent article, and absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible structure of an absorbent article in which elastic shrinkage force is changed into an expanding/contracting direction of an elastic member with a simple structure.SOLUTION: The above problem is solved as follows: a first sheet material 20A and a second sheet material 20B are bonded in an expanded state by a hot melt adhesives 40 of a predetermined width intermittently arranged in the expanding/contracting direction, and thereby a sheet bonding part is formed; an elastic member 25 is fixed in the first sheet material 20A and the second sheet material 20B by each hot melt adhesive 40, and an elastic member fixing part 25f is formed; the hot melt adhesive 40 has a first area A1 applied in a first pattern, and a second area A2 positioned at least in one side of the expanding/contracting direction to this first area A1 and with the hot melt adhesives 40 applied in a second pattern unlike the first pattern; and a non-fixation ratio in the expanding/contracting direction in the first area A1 is smaller than the non-fixation ratio in the expanding/contracting direction in the second area A2.

Description

  The present invention relates to a stretchable structure of an absorbent article whose elastic contraction force changes in the stretch direction of an elastic member, and an absorbent article provided with this stretchable structure.

  For example, a pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.

  In the pants-type disposable diaper, in order to improve the fit to the body, an elongated elastic member such as rubber thread is fixed in an extended state at various places on the exterior sheet to form a stretchable structure around the waist Among them, those provided with a waist edge elastic member along the width direction at the edge of the waist opening, and a waist lower elastic member along the width direction on the crotch side than the waist edge elastic member, It has relatively high body fit and is widely used.

  On the other hand, a tape-type disposable diaper has a crotch part, a ventral part extending to the front side of the crotch part, a back side part extending to the rear side of the crotch part, and a fastening projecting from both sides of the back part. It has a tape and a target tape that is located on the outer surface of the abdomen and to which the fastening tape is connected. When wearing it on the body, turn the fastening tape from both sides of the waist to the outer surface of the abdomen and use it as the target tape. It has a structure to connect. Such a tape-type disposable diaper is used not only for infants but also widely used for nursing care (adult use). In general, tape-type disposable diapers are inferior in the fit around the waist compared to pants-type disposable diapers. To improve this, thread rubber along the width of the waist around the back and fastening tape An elongated elastic member such as the above is fixed in an extended state along the width direction to form a stretchable structure in the trunk periphery direction (see, for example, Patent Document 1).

  Furthermore, since the body surface is rich in unevenness, it has been proposed to change the elastic contraction force of some elongated elastic member groups according to the passing position of the body surface (see, for example, Patent Document 4).

Japanese Patent No. 2010-22588 JP 2009-148447 A JP 2011-078377 A Japanese Patent No. 4850131 Japanese Patent No. 5280276

  However, in the method of changing the elastic contraction force of some of the elongated elastic member groups as described above, the elastic contraction force can be changed in the direction orthogonal to the elastic member expansion / contraction direction, but the elastic member expansion / contraction direction ( In the case of Patent Document 4, the elastic contraction force cannot be changed in the waist direction.

  Of course, the elastic contraction force can be changed in an arbitrary direction by joining together elastic elastic materials having different elastic contraction forces. If a plurality of elastic members are arranged in series in the expansion / contraction direction, it is not impossible to change the elastic contraction force in the expansion / contraction direction of the elastic member. However, these methods have a problem in that the number of materials increases and the structure becomes complicated, which makes it difficult to manufacture.

  Therefore, a main problem of the present invention is to change the elastic contraction force in the expansion / contraction direction of the elastic member with a simple structure.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic members,
The elastic member is fixed to the first sheet material and the second sheet material by an elastic member fixing portion having a predetermined width that is intermittently arranged in the expansion and contraction direction in the expanded state of the first sheet material and the second sheet material. Has been
The elastic member fixing portion is positioned on at least one side in the expansion / contraction direction with respect to the first region where the elastic member fixing portion is formed in a first pattern, and the elastic member fixing portion is the first pattern. And a second region formed in a second pattern different from
The expansion / contraction direction unfixed ratio in the first region is narrower than the expansion / contraction direction unfixed ratio in the second region,
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
In the stretchable structure of the absorbent article of the present invention, when the stretch in the stretch direction is the same, the elastic contraction force is stronger in the first region than in the second region. Therefore, the elastic contraction force can be changed in the expansion / contraction direction of the elastic member with a simple structure that only changes the pattern of the elastic member fixing portion. The definitions of the terms “elastic contraction force” and “stretching direction non-fixed ratio” will be described later.

<Invention of Claim 2>
The stretch structure of an absorbent article according to claim 1, further comprising the second region on at least one side in a direction orthogonal to the stretch direction with respect to the first region.

(Function and effect)
By making the pattern of the elastic member fixing portion in this way, the elastic contraction force can be changed not only in the expansion / contraction direction but also in the direction orthogonal to the expansion / contraction direction.

<Invention of Claim 3>
In the unfolded state of the first sheet material and the second sheet material, the first sheet material and the first sheet material are formed by a linear sheet joining portion that is intermittently arranged in the expansion / contraction direction and that is continuous in a direction intersecting the expansion / contraction direction. While two sheet materials are joined, the crossing part with the elastic member among these sheet joined parts is the elastic member fixing part,
As the first sheet material and the second sheet material contract as the elastic member contracts, the portions of the first sheet material and the second sheet material that are located between the sheet joints swell in opposite directions, respectively. It has a structure in which ridges are formed,
The sheet bonding portion that passes through the first region and the second region has the first width in the first region and the second width in the second region. The width changes on the way,
The elastic structure of the absorbent article according to claim 1.

(Function and effect)
Thus, by continuing the sheet joint portion in the direction intersecting with the expansion and contraction direction, the continuity of wrinkles appearing on the surface is high, and the appearance and the air permeability are improved.

<Invention of Claim 4>
An absorptive article provided with the elastic structure according to any one of claims 1 to 3.

(Function and effect)
It has the advantages of the aforementioned telescopic structure.

<Invention of Claim 5>
The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic member is in the width direction,
The second region is provided in the iliac facing region in the outer body of the front body,
The first region is provided in a leg root region in the outer body of the front body.
The absorbent article according to claim 4.

(Function and effect)
In conventional pants-type disposable diapers, depending on the wearer's body shape, tightening the recesses at the bases of the legs may tighten the bulge formed by the upper anterior iliac spine and the iliac crest too tightly. is there. On the other hand, as in the invention described in this section, the second region where the elastic contraction force is relatively weak is provided in the iliac facing region, and the first region where the elastic contraction force is relatively strong is provided on the leg. By providing in the root region, the difference between the tightening with respect to the bulge formed by the upper anterior iliac spine and the iliac crest and the tightening with respect to the root of the leg can be reduced, thereby improving the fit.

<Invention of Claim 6>
The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic member is in the width direction,
The second region is provided in the abdomen facing region in the outer body of the front body,
The first region is provided in a leg root region in the outer body of the front body.
The absorbent article according to claim 4 or 5.

(Function and effect)
In a conventional pants-type disposable diaper, depending on the wearer's body shape, if the fastening of the base of the leg is sufficiently tightened, the tightening (particularly when full) of the abdomen may become too tight. On the other hand, as in the invention described in this section, the second region where the elastic contraction force is relatively weak is provided in the abdomen facing region, and the first region where the elastic contraction force is relatively strong is provided as the root of the leg. By providing in the region, the difference between the tightening to the abdomen and the tightening to the root of the leg can be reduced, thereby improving the fit.

  As described above, according to the present invention, there is an advantage that the elastic contraction force changes in the expansion / contraction direction of the elastic member with a simple structure.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a top view which shows the cut pattern of an elastic member. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. It is a top view of the underpants type disposable diaper of the unfolded state which shows principal parts, such as a hot-melt-adhesive agent for fixation of an elastic member. It is a top view of the underpants type disposable diaper of the unfolded state which shows principal parts, such as a hot-melt-adhesive agent for fixation of an elastic member. It is a top view of the underpants type disposable diaper of the unfolded state which shows principal parts, such as a hot-melt-adhesive agent for fixation of an elastic member. It is a top view of the underpants type disposable diaper of the unfolded state which shows principal parts, such as a hot-melt-adhesive agent for fixation of an elastic member. It is a principal part enlarged plan view of the test sample of the unfolded state which shows principal parts, such as a hot-melt-adhesive agent for fixation of an elastic member. It is a graph of a tensile test result. It is a graph of a tensile test result.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “elongation rate” means a value when the natural length is 100%. Moreover, the dot pattern part in a figure has shown joining means, such as a hot-melt-adhesive.

  1 to 7 show a pants-type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body F and a back body B, and an interior body 10 that is fixed to and integrated with the inner surface of the exterior body 20. The interior body 10 is formed by interposing an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. At the time of manufacture, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot-melt adhesive (dotted pattern portion in FIG. 2), the interior body 10 and the exterior body 20 are joined. Is folded at the center in the longitudinal direction (front-rear direction), which is the boundary between the front body F and the back body B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form the side seal portion 21. Thus, a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.

(Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained. Although the planar shape of the interior body 10 is not particularly limited, it is generally a substantially rectangular shape as illustrated.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.

  The shape of the absorbent body 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides at the crotch portion. Although the size of the constricted portion 13N can be determined as appropriate, the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about -60%. In the case where the constricted portion 13N is provided, if the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not include the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13. A part is formed.

  A solid gather BS that fits around the legs is formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion to the side of the interior body. The body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed The portion is formed of a gathered nonwoven fabric 15 that is turned into a double sheet by folding.

  Further, between the double sheets, an elongated gather elastic member 16 is disposed at the tip of the free part. The gather elastic member 16 is for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge by elastic contraction force as shown by a two-dot chain line in FIG. 5 in the product state.

  The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS as shown in FIG. . As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the gathered elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. The gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.

  In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(External body structure example)
As shown in FIGS. 4 to 6, the exterior body 20 is composed of a first sheet material 20 </ b> A and a second sheet material 20 </ b> B each made of a nonwoven fabric or the like (that is, the second sheet forms the outer surface of the article in this embodiment). A non-woven sheet having a two-layer structure, and variously between the first sheet material 20A and the second sheet material 20B and between the non-woven fabric of the folded portion 20C formed by folding the second sheet material 20B to the inner surface side at the waist opening edge An elastic member is provided to provide elasticity. The planar shape has a substantially hourglass shape as a whole due to the concave leg surrounding lines 29 formed to form leg openings on both sides of the middle.

The material of the first sheet material 20 </ b> A and the second sheet 20 </ b> B is not particularly limited, but is particularly preferably a nonwoven fabric having a basis weight of 15 to 20 g / m ² . The first sheet material 20A and the second sheet material 20B are each composed of a single base material, and either one or both are laminates formed by laminating a plurality of base materials such as nonwoven fabrics. Also good.

  In the exterior body 20 of the illustrated form, as an elastic member, in the developed shape shown in FIGS. 1 to 3, the waist elastic member 24 disposed in the vicinity of the waist opening 23, the front body F and the back body B, A plurality of waist elastic members 25 arranged along the width direction at intervals in the vertical direction, and in each of the front body F and the back body B, separately from the waist elastic member group 25, Extending from the side seal portion 21 along the one leg opening to the crotch portion, crossing the crotch portion, and extending while curving in a pattern extending to the other side seal portion 21 along the other leg opening portion, A plurality of curved elastic members 26 and 28 are provided so as to be spaced from each other without crossing each other. These elastic members 24 to 26 and 28 are fixed in a state of being stretched at a predetermined stretch rate along the extending direction. In addition, in this exterior body 20, what is called a leg periphery elastic member which continues from the side seal part of the front body F to the side seal part of the back body B along the leg periphery line 29 is not provided.

  The waist elastic member 24 includes a plurality of thread rubbers and the like disposed in the vicinity of the waist opening edge in the vicinity of the waist opening edge in the range of the side seal portion 21 where the front body F and the back body B are joined. This is an elongated elastic member for attaching a diaper to the body by applying an elastic contraction force so as to tighten around the waist of the body. Two or more, preferably five or more waist elastic members 24 are arranged with an interval of about 2 to 10 mm, preferably about 4 to 7 mm, so as to form a stretchable stretch part with a certain size. The waist elastic member 24 may be a tape or a tape. Moreover, although the waist part elastic member 24 of illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the 2nd sheet material 20B in a waist part, it clamps between 20 A of 1st sheet materials, and the 2nd sheet material 20B. You may do it.

  The waist elastic member 25 is an elongated elastic member such as a rubber thread, which is disposed in the side seal portion 21 in the vertical direction over a range from the upper part to the lower part. This is to apply an elastic contraction force in the width direction to the waist circumference part of the body B so that the diaper is in close contact with the body. The waist elastic members 25 are arranged in an amount of 20 or more, preferably 40 or more with an interval of about 2 to 15 mm, preferably about 5 to 10 mm, so as to form a stretchable stretch part with a certain size. The boundary between the waist elastic member 24 and the waist elastic member 25 is not necessarily clear. For example, even if the number of the elastic members arranged in the width direction with the front body F and the back body B spaced apart in the vertical direction cannot be specified, some of the upper members function as the waist elastic members. The remaining elastic members only need to function as waist elastic members.

  In the back body B, the dorsal curved elastic member 26 arranged separately from the waist elastic member 25 is an elongated elastic member such as rubber thread, and is arranged along a predetermined curve. There may be one dorsal curved elastic member 26, but it is preferable that there are a plurality of dorsal curved elastic members 26. In the illustrated example, the elastic elastic members 26 are elongated elastic members such as five rubber threads. They are arranged at intervals without crossing. This dorsal curved elastic member group 26 is not arranged so that a few bundles of substantially two or three elastic members are closely spaced, but to form a fitting expansion / contraction part having a certain size. 3 to 20 mm, preferably 6 to 16 mm, with 3 or more, preferably 5 or more.

  In the front body F of the exterior body 20, the abdomen curved elastic member 28 arranged separately from the waist elastic member group 25 is an elongated elastic member such as rubber thread, and is arranged along a predetermined curve. . There may be one ventral curved elastic member 28, but preferably there are a plurality of ventricular curved elastic members 28. In the illustrated example, there are five thread-like elastic members, and these ventral curved elastic members 28 do not cross each other. , Spaced apart. The ventral-curved elastic member group 28 is not arranged so that a few bundles of the elastic members are spaced apart from each other, but forms a stretchable fitting part with a certain size. 3 to 20 mm, preferably 6 to 16 mm, with 3 or more, preferably 5 or more.

  In the illustrated example, the waist elastic member 25 and the curved elastic members 26 and 28 arranged in the front body F and the back body B are continuously fixed to the exterior body during manufacturing, as shown in FIG. Later, a part or all of the portion overlapping with the interior body is cut into a non-shrinkable portion (that is, a portion overlapping with the cutting pattern CP in FIG. 3) that is finely cut with a predetermined cutting pattern CP and does not act on the contraction force. The part that extends while curving to the side from the contracted part is the contracted part where the contracting force acts (that is, the waist elastic member 25 and the curved elastic members 26 and 28 on the side of the cutting pattern CP in FIG. The remaining part). For this reason, the waist elastic member 25 and the curved elastic members 26 and 28 are continuously provided from the side seal portion 21 on one side to the side seal portion 21 on the other side (opposite side) across the interior body 10. Part or all of the part that overlaps the body is finely cut. Thereby, the shrinkage | contraction of the width direction of an interior body (especially absorber 13) can be prevented more. Of course, the waist elastic member 25 and the curved elastic members 26, 28 can also be arranged continuously across the interior body 10.

  The exterior body 20 mentioned above can be manufactured by the technique of Unexamined-Japanese-Patent No. 4-28363 or Unexamined-Japanese-Patent No. 11-332913, for example. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.

  Unlike the illustrated example, the curved elastic members 26 and 28 may be provided only on one of the front body F and the back body B, or both may be omitted. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, the curved elastic members 26 and 28 are disposed on the back body B side and a part or all of the group of curved elastic members disposed on the front body F side. Although a form (not shown) in which a part or all of the group of curved elastic members B intersected can be adopted, the group of curved elastic members 28 arranged on the front body F side, as shown in the example, A configuration in which the curved elastic members B arranged on the body B side are separated from each other in the longitudinal direction at a position slightly deviated from the front-rear intermediate portion, particularly the front body F without crossing each other is preferable. It is preferable that the minimum longitudinal separation distance in the direction separation range is about 10 to 15 mm, and a wide fixed region described later is provided in this portion.

  Further, the curved elastic members 26 and 28 do not have to be entirely curved, and may partially have a linear portion.

  The elongation rate at the time of fixing the elastic members 24 to 28 can be appropriately determined. However, in the case of a normal adult, the waist elastic member 24 is about 230 to 320%, the waist elastic member 25 is about 150 to 300%, The curved elastic members 26 and 28 can be about 230 to 320%.

  As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 mounted on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the presser sheets 50 and 60 described above.

(About stretchable structure)
In the present pants-type disposable diaper, the stretchable structure of the present invention is employed in the stretchable region by the waist elastic member 25 in the exterior sheet 20 of the front body F. That is, as shown in FIG. 4 and FIG. 8, the first sheet material 20 </ b> A and the second sheet material 20 </ b> B are in the expansion / contraction direction (extension direction of the waist elastic member 25, that is, a diaper in the illustrated embodiment). The sheet joining portion is formed by joining with a hot melt adhesive 40 having a predetermined width that is intermittently arranged in the width direction). Further, the waist elastic member 25 is disposed so as to pass through each hot melt adhesive 40, and is fixed to the first sheet material 20A and the second sheet material 20B by each hot melt adhesive 40 to form an elastic member fixing portion 25f. Has been. At the time of manufacture, the hot melt adhesive 40 is applied to one or both of the first sheet material 20A and the second sheet material 20B, and the waist elastic member 25 is attached to the both sheet materials when the two sheet materials 20A and 20B are joined. What is necessary is just to insert between 20A and 20B.

  The interval 25d between the adjacent waist elastic members 25 can be determined as appropriate. However, if it is too wide, the thickness of the heel formed changes in a direction crossing the expansion and contraction direction, and this also makes it difficult. The interval 25d is preferably 2 to 15 mm, particularly about 5 to 10 mm as described above.

  The thickness and elongation rate of the waist elastic member 25 (elongation rate in a state in which the stretchable structure is fully deployed) may be appropriately selected according to the mounting position of the waist elastic member 25. The thickness of the surrounding elastic member 25 is preferably about 310 to 940 dtex, and the elongation rate is preferably about 150 to 300%.

  And, characteristically, as shown in FIG. 8, at least one side of the first region A1 where the hot melt adhesive 40 is applied in the first pattern and the first region A1 in the expansion / contraction direction. The hot melt adhesive 40 has a second region A2 applied in a second pattern different from the first pattern, and the stretch direction unfixed ratio in the first region A1 is the first 2 is smaller than the unfixed ratio of the stretching direction in the region A2.

  Here, the “stretching direction unfixed ratio” means a value obtained by dividing “the total sum of the elastic member fixing portions in the expanding and contracting direction in the expanding and contracting direction” by “the length of the region in the expanding and contracting direction”. For example, in the case of the form shown in FIG. 8, in the larger first region A1, the “total length of the elastic member fixing portions in the expansion / contraction direction in the expansion / contraction direction interval” is d1 × 16, and the “region expansion / contraction direction length” Is d1 × 16 + w1 × 17, and the ratio of non-fixed in the expansion / contraction direction is d1 × 16 / (d1 × 16 + w1 × 17). In the second region A2 located on both sides in the width direction, “elastic member fixing in the expansion / contraction direction” Since the “total length in the expansion / contraction direction of the part” is d2 × 4 and the “length in the expansion / contraction direction of the region” is (d2 × 4 + w2 × 5), the “stretching direction unfixed ratio is d2 × 4 / (d2 × 4 + w2). Similarly, in the form shown in Fig. 11 to be described later, the expansion / contraction direction non-fixed ratio of the first region is d1x6 / (d1x6 + w1x7), and the expansion / contraction direction of the second region is The non-fixed ratio is d2 × 4 / (d2 × 4 + w2 × 5). Contracting direction non-fixed ratio in the first region A1 is 1.5 to 4 times the stretch direction non-fixed ratio in the second region A2, it is desirable that the particular 2-3 times.

  As described above, by having the first region A1 and the second region A2 having different ratios of non-fixed expansion / contraction direction, when the expansion in the expansion / contraction direction is the same, the elastic contraction force is greater than that of the second region A2. The region A1 is stronger. Therefore, the elastic contraction force by the waist elastic member 25 can be changed in the expansion / contraction direction of the waist elastic member 25 with a simple structure that only changes the application pattern of the hot melt adhesive 40. Actually, the same material (the same elongated elastic member 25 (thread rubber), the same sheet material 20A, 20B (nonwoven fabric), the same hot melt adhesive 40) is used, and the interval (6 mm) and the number (5) of the elastic members 25 are used. ) Are also the same, only the application pattern of the hot melt adhesive 40 is made into three types of FIGS. 12A, 12B, and 12C, and samples of the exterior sheet 20 only (all having the same width) are prepared, and the tensile test is performed. When this is done, as can be seen from the graph of the test results shown in FIG. 13 (in the case of the rubber thread thickness of 310 dtex) and the graph of the test results shown in FIG. 14 (in the case of the rubber thread thickness of 480 dtex), the hot melt adhesive 40 12 (c), which is continuous in the longitudinal direction of the rubber thread, has the largest load at the same elongation rate at the time of stretching and returning, that is, the strongest elastic contraction force, and the pattern of FIG. 12 (b). Elastic recoil is weakened in the order of the pattern of FIG. 12 (a). The “elongation rate” in FIGS. 13 and 14 is a value when the natural length is 0%. Further, as can be seen from this test example, the “elastic contraction force” means the contraction force in the longitudinal direction of the elastic member that is exhibited when the elastic member elastically expands and contracts in the longitudinal direction.

  As shown in FIG. 11, the first region A1 and the second region A2 may extend over the entire direction orthogonal to the expansion / contraction direction in the target expansion / contraction region, but as shown in FIG. By providing the first region A1 and the second region A2 in the direction orthogonal to the expansion / contraction direction, the elastic contraction force can be changed not only in the expansion / contraction direction but also in the direction orthogonal to the expansion / contraction direction.

  The application pattern of the hot-melt adhesive 40 can be appropriately determined as long as it is different between the first region A1 and the second region A2. Note that the different patterns include both cases where the dimensions are the same shape as in the forms shown in FIGS. 8 and 11 and cases where the shapes are different as in the forms shown in FIGS. 9 and 10.

  As shown in FIG. 8, the first width in the first region A1 is based on a vertical stripe pattern in which linear application portions that are continuous along the direction orthogonal to the expansion / contraction direction are intermittently arranged in the expansion / contraction direction. w1, the first interval d1, and the second region A2, the second width w2, which is narrower than the first width w1, and the second interval d2, which is wider than the first interval d1, in the second region A2. It is one preferred form to change the line width of the melt adhesive 40 in the middle of the line. In this form, with the contraction of the waist elastic member 25, the portions located between the sheet joining portions in the first sheet material 20A and the second sheet material 20B are contracted, and bulges are formed by swelling in opposite directions. . At the time of wearing, the waist elastic member 25 is extended from this state to a certain extent, the hem of the heel expands, and the height of the heel decreases accordingly. Therefore, in this form, the continuity of wrinkles appearing on the surface is high, looks good, and has excellent air permeability.

  Also, as shown in FIG. 9, a dot-like hot melt adhesive 40 such as a circle is intermittently arranged in the expansion / contraction direction and the direction orthogonal thereto, and the width of each elastic member fixing portion 25f is set in the first region A1. Then, the area of each dot-shaped application portion can be changed so that the second width w2 is obtained in the first width w1 and the second region A2. As shown in FIG. 10, the first region A1 and the second region A2 may have completely different shapes (in the illustrated example, the first region A1 has a vertical stripe shape and the second region A2 has a zigzag shape). As can be seen from these examples, in the present invention, the application pattern of the hot melt adhesive 40 has a pattern with a dimensional change. Therefore, a colored (excluding white) hot melt adhesive 40 is used, and its shape is changed. By making it visible from the outer surface, the design can be improved.

  In addition, as a simple pattern, as shown in FIG. 11, based on a vertical stripe pattern in which linear application portions having a predetermined width that are continuous along a direction orthogonal to the stretching direction are intermittently arranged in the stretching direction, It is also possible to set the entire range in the expansion / contraction direction as the first region A1 and the other range as the second region A2.

  The dimensions of the coating pattern may be determined as appropriate, but in the form based on the vertical stripe pattern, for example, the first width w1 can be about 5 to 10 mm, and the second width w2 is the first width w1. The first distance d1 can be about 2 to 6 mm, and the second distance d2 is about 2 to 3 times the first distance d1. can do.

  The positions of the first region A1 and the second region A2 can be determined as appropriate. In the front body F, the bulge formed by the upper anterior iliac spine and the iliac crest, and the bulge of the abdomen (particularly when full) ) Is easily tightened, and the tightening of the recess at the base of the leg is likely to be weak. Therefore, as shown in FIG. 8, the iliac facing region and the abdominal facing region are the second region A2 in which the elastic contraction force is relatively weak, and the base region of the leg is relatively elastic in contraction force. It is desirable that the first region A1 be strong. Further, as shown in FIG. 8, the thigh side of the base area of the leg is preferably the first area A1. Thereby, the difference between the bulge formed by the upper anterior iliac spine and the iliac crest and the tightening to the abdomen and the tightening to the root of the leg can be reduced, and thus the fit can be improved.

(Other)
In the above example, the elastic member fixing portion 25f is formed of the hot melt adhesive 40, but it is elastic with the target material, that is, the first sheet material 20A and the second sheet material 20B, such as heat sealing or ultrasonic sealing. You may form by the welding means which fixes by at least one welding with the member 25. FIG.
Moreover, in the said example, although the cross | intersection part with the elastic member 25 is made into the elastic member fixing | fixed part 25f among the sheet | seat junction parts of the 1st sheet material 20A and the 2nd sheet material 20B, a sheet | seat junction part and an elastic member fixing | fixed part 25f may be formed at a different position.
Furthermore, in the above example, the sheet bonding portion and the elastic member fixing portion 25f are formed by the same means (hot melt adhesive 40), but can be made different, for example, either one is hot melt adhesive 40, The other may be formed by welding means for fixing by at least one welding of the target material, such as heat sealing or ultrasonic sealing.
In addition, the above example is an application example to the stretchable region by the waist elastic member 25 of the front body of the pants-type disposable diaper, but it may be applied to the stretchable region by the waist elastic member 24. You may apply to the expansion-contraction area | region only by the surrounding elastic member 25, and also may apply to the expansion-contraction area | region of a back body. Moreover, the above-mentioned expansion-contraction structure is applicable also to other expansion-contraction parts, such as the trunk | drum circumference part of the back side part of a tape type disposable diaper described in the term of the prior art, a solid gather.

  The present invention can be used for absorbent articles.

  A1 ... first region, A2 ... second region, B ... back body, F ... front body, d1 ... first interval, d2 ... second interval, w1 ... first width, w2 ... second Width, 10 ... Interior body, 11 ... Liquid permeable top sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 13N ... Constricted portion, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Gather elastic member 20 ... exterior body, 20A ... first sheet material, 20B ... second sheet material, 20C ... folded portion, 21 ... side seal part, 24 ... waist elastic member, 25 ... waist elastic member, 25f ... elastic member fixed Part 26 ... dorsal curve elastic member 28 ... ventral curve elastic member 29 29 leg circumference line 40 hot melt adhesive

Claims (6)

The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic members,
The elastic member is fixed to the first sheet material and the second sheet material by an elastic member fixing portion having a predetermined width that is intermittently arranged in the expansion and contraction direction in the expanded state of the first sheet material and the second sheet material. Has been
The elastic member fixing portion is positioned on at least one side in the expansion / contraction direction with respect to the first region where the elastic member fixing portion is formed in a first pattern, and the elastic member fixing portion is the first pattern. And a second region formed in a second pattern different from
The expansion / contraction direction unfixed ratio in the first region is narrower than the expansion / contraction direction unfixed ratio in the second region,
An elastic structure of an absorbent article characterized by the above.   The stretch structure of an absorbent article according to claim 1, further comprising the second region on at least one side in a direction orthogonal to the stretch direction with respect to the first region. In the unfolded state of the first sheet material and the second sheet material, the first sheet material and the first sheet material are formed by a linear sheet joining portion that is intermittently arranged in the expansion / contraction direction and that is continuous in a direction intersecting the expansion / contraction direction. While two sheet materials are joined, the crossing part with the elastic member among these sheet joined parts is the elastic member fixing part,
As the first sheet material and the second sheet material contract as the elastic member contracts, the portions of the first sheet material and the second sheet material that are located between the sheet joints swell in opposite directions, respectively. It has a structure in which ridges are formed,
The sheet bonding portion that passes through the first region and the second region has the first width in the first region and the second width in the second region. The width changes on the way,
The elastic structure of the absorbent article according to claim 1.   An absorptive article provided with the elastic structure according to any one of claims 1 to 3. The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic member is in the width direction,
The second region is provided in the iliac facing region in the outer body of the front body,
The first region is provided in a leg root region in the outer body of the front body.
The absorbent article according to claim 4. The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic member is in the width direction,
The second region is provided in the abdomen facing region in the outer body of the front body,
The first region is provided in a leg root region in the outer body of the front body.
The absorbent article according to claim 4 or 5.