JP2014188189A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which prevents worsening of the touch to a skin, fuzzing, or the like while improving air permeability between the inside and outside of folds.SOLUTION: An absorbent article includes: thin and long elastic members 103 provided at intervals between a skin side layer 101 and an outside layer 102; joint parts 104 formed by intermittently joining both of the layers 101, 102 at least in a direction in which the elastic member 103 expands and contracts; and an expanding and contracting part for fitting in which folds 105, 106 are formed respectively when parts located between the joint parts 104 of both of the layers 101, 102 bulge in mutually opposite directions in a contracted state of both of the layers 101, 102 in association with the contraction of the elastic member 103. In the absorbent article, holes 115 that penetrate in a thickness direction of the layer are intermittently formed in a direction where the folds 105 extend on side surface parts of the fold 105 in the skin side layer out of both of the layers 101, 102, and no holes 115 penetrating in the thickness direction of the layer are formed on apexes of the folds 105.

Description

  The present invention relates to an absorbent article provided with a stretchable part for fitting that is excellent in breathability and touch.

  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 a pants-type disposable diaper, in order to improve the fit to the body, an elongated elastic member such as a rubber thread is fixed in an extended state at various places on the exterior sheet to constitute a stretchable part for fitting. Among them, the waist edge elastic member along the width direction at the edge of the waist opening, and the waist lower elastic member along the width direction on the crotch side than the waist edge elastic member It has a relatively high 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 fit in the waistline direction compared to pants-type disposable diapers. (For example, refer to Patent Document 1).

  Further, in recent years, an elongated elastic member is arranged with an interval between adjacent layers of a sheet-like portion having a laminated structure, and both layers of the adjacent layer are intermittently joined in at least the expansion / contraction direction of the elastic member. A joint expansion / contraction part (for example, patent) in which the joints are formed and the portions located between the joints of both layers swell in opposite directions in the contracted state of both layers accompanying the contraction of the elastic member. Document 2) has been proposed. This heel part not only provides a soft touch, but the inner space of the heel and the groove between the heels contribute to the improvement of air permeability. There is room for improvement in terms of gender.

  As a measure for improving the air permeability, Patent Document 3 proposes a technique for forming an opening communicating with the inside and outside of the top of the bag. However, in this prior art, since the opening is formed at the top of the heel and the edge of the hole easily hits the skin, the touch is bad (when the hole is provided on the skin side, the wearer is comfortable There is a problem that when the opening is provided on the outer surface, the touch when the product is held by hand is a problem). Also, if the opening is formed at the top of the heel, the edge of the opening rubs against the skin or outer (underwear or other clothing that covers the outside, another absorbent article), causing fluffing or generation of fiber waste The point to do is also a problem. Furthermore, the hole is easily blocked by skin or clothing, and there is room for improvement in air permeability.

JP 2010-22588 A JP 2009-148447 A JP 2011-078377 A

  Therefore, a main problem of the present invention is to prevent deterioration of the touch and fluffing while improving the air permeability inside and outside the heel.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Elongated elastic members are arranged at intervals between adjacent layers of the sheet-like portion having a laminated structure, and both layers of the adjacent layers are intermittently bonded in at least the expansion / contraction direction of the elastic member to form a bonded portion. And a stretchable portion for fitting, in which the portions located between the joint portions of the two layers swell in opposite directions to form ridges in the contracted state of the two layers accompanying the contraction of the elastic member. In goods,
A hole penetrating in the thickness direction of the layer is intermittently formed in the side surface portion of the ridge in at least one of the two layers in the direction in which the heel extends, and the top portion of the ridge penetrates in the thickness direction of the layer. No hole is formed,
An absorbent article characterized by the above.

(Function and effect)
In the fitting stretchable part in which the hole is formed in the side part of the heel as described above, the edge of the hole is difficult to hit the skin, and thus the touch is hardly deteriorated. Moreover, there is little possibility that the edge of a hole will rub against skin and an outer | wear, and it may become fluffy and fiber waste will generate | occur | produce. Furthermore, the hole is not easily blocked by skin or clothing, and the air permeability through the hole is not easily impaired. That is, according to the present invention, it is possible to prevent deterioration of the touch and fluffing while improving the air permeability inside and outside the heel. The term “hole” includes both “opening” that is an open hole and “slit” that is a linear hole that is not open. In addition, providing a hole “in the side surface of the ridge” means that the range of the hole does not reach (does not reach) the apex of the ridge.

<Invention of Claim 2>
The sheet-like portion is a skin side layer in which any one layer is located on the skin side, and the other side layer is an outer layer located on the outside of the skin side layer, and only in the wrinkles of the skin side layer The absorbent article according to claim 1, wherein a hole is formed, and a space between the ridges of both layers is continuous to the edge of at least one layer across the elastic member and opens from the edge.

(Function and effect)
Thus, in the expansion-contraction part which has a skin side layer, a skin will not be exposed to the outer side of the expansion part for fitting by forming a hole only in the eyelid of a skin side layer. Nevertheless, since the space between the folds of both layers continues to the edge of at least one of the layers across the elastic member and opens from this edge, ventilation through the pores of the skin side layer and between the folds of both layers It is also excellent in properties.

<Invention of Claim 3>
The sheet-like portion is a skin side layer in which any one layer is in contact with the skin, the other layer is an outer layer located outside the skin side layer, and the holes are respectively formed in the ridges of the both layers. The absorbent article according to claim 1 or 2, wherein the hole in the ridge of one layer and the hole in the ridge of the other layer are arranged so as not to overlap each other.

(Function and effect)
While the holes are formed in the ridges of both layers in this way, the positions of each other do not overlap (displace), so that the skin is not exposed to the outside of the stretchable part for fit, but for fit The skin side and the opposite side of the stretchable part communicate with each other through the hole in the skin side layer, the space between the folds in both layers, and the hole in the layer opposite to the skin side, so that the air permeability is very good Become.

<Invention of Claim 4>
The said hole is formed in the both side surface part of the collar, respectively, and the position of the said expansion-contraction direction at least partially overlaps the hole of one side part, and the hole of the other side part. The absorbent article according to any one of the above.

(Function and effect)
Although initially not anticipated, when holes are formed on both sides of the ridge in this way, the top of the ridge is slightly recessed at the portion corresponding to the hole in the extending direction of the ridge, possibly because the side support is reduced. I will become As a result, the contact area between the heel and the skin or the outer is reduced, the skin irritation is reduced, and the air permeability is further improved. Of course, there is also an advantage that the shape of the ridge is a uniform appearance on the left and right sides.

<Invention of Claim 5>
The hole is an opening, and the periphery of the opening forming portion of the ridge is separated leaving a part on the joint portion side, and the opening forming portion is opposed to the ridge from the portion left without being separated. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article extends into a space between the heel and the housing and is accommodated in the space.

(Function and effect)
In order to enhance the effect of improving the air permeability, it is desirable that the hole is an opening, but forming the opening by punching processing is not preferable because waste material is generated. This problem is solved by making the hole into a slit, but in that case, the improvement in air permeability is poor compared to the opening. On the other hand, if an opening forming part is cut off leaving a part as mentioned above and it accommodates in the space formed by the opposing part of a ridge, an opening can be formed, without generating waste material.

<Invention of Claim 6>
6. The absorbent article according to claim 5, wherein the opening forming portion is folded to the inner surface side of the opposing ridge with the portion left uncut as a fold, and is joined to the inner surface of the opposing ridge.

(Function and effect)
If the opening forming part is not fixed, there may be a problem that the opening forming part flutters and the opening closes, gets in the way, or worsens the touch. Therefore, it is desirable to prevent these problems by folding and fixing the opening forming portion in this way. Moreover, such a structure can be manufactured without any special process as described later.

  As described above, according to the present invention, there are advantages that the air permeability inside and outside the heel can be improved, and the deterioration of the touch and the fluffing can be prevented.

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 the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is the (a) partial fracture top view of the unfolded state which shows the structure principal part of the expansion-contraction part for fitting, and (b) the perspective view of a natural length state. It is sectional drawing which shows the structure principal part of the expansion-contraction part for fitting. It is a top view of the unfolding state which shows the structure principal part of the expansion-contraction part for a fit. It is a top view of the unfolding state which shows the structure principal part of the expansion-contraction part for a fit.

  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. 5 to 7, 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 stretching 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 includes a first sheet 20 </ b> A and a second sheet 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). Various elastic members are disposed between the first sheet 20A and the second sheet 20B and between the nonwoven sheets of the folded portion 20C formed by folding the second sheet 20B to the inner surface side at the waist opening edge. In addition, elasticity is given. The planar shape has a substantially hourglass shape as a whole due to the concave leg-around lines 29 formed to form the leg openings on both sides of the middle.

  Each of the first sheet 20A and the second sheet 30B is composed of a single base material, and either one or both may be a laminate formed by laminating a plurality of base materials such as nonwoven fabrics. .

  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 waistline elastic members 25 arranged in 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 waistline 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 28 are fixed in a state of being stretched at a predetermined stretch rate along their extending directions. 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. It is an elongated elastic member for attaching a diaper to the body by applying an expansion / 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 the illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the 2nd sheet | seat 20B in a waist part, even if it clamps between the 1st sheet | seat 20A and the 2nd sheet | seat 20B. good.

  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 a vertical direction over a range from the upper part to the lower part. The body B is provided with an elastic force in the width direction on the waist portion of the body B, so that the diaper is in close contact with the body. The waist elastic members 25 are arranged at 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. Note that 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 have 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 across the interior body 10 to the side seal portion 21 on the other side (opposite side). 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 and 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 90 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 230 to 320%, 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. For this reason, the folded portion 20C formed by folding the outer package 20 on the inner surface of the diaper can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

<About the structural example of the stretchable part for fitting>
The structure of the stretchable part for fit of the present invention can be applied to the stretchable part for fit by the waist elastic member 24 and the waist elastic member 25 of the exterior body 20 in, for example, the pants-type disposable diaper as described above. That is, in the stretchable part for fitting by the waist elastic member 24, the folded portion 20C of the second sheet corresponds to the skin side layer (layer 101 in the example described later) of the present invention, and the outer surface side portion of the second sheet of the present invention. And the waist elastic member 24 corresponds to the elongated elastic member of the present invention. Moreover, in the expansion-contraction part for a fit by the waist elastic member 25, the 1st sheet | seat 20A is equivalent to the skin side layer of this invention, the 2nd sheet | seat 20B is equivalent to the outer layer of this invention, and the waist elastic member 25 is This corresponds to the elongated elastic member of the present invention.

  However, the stretchable part for fitting of the present invention is not limited to this, and the structure of the stretchable part for fitting described above is the waistline part and the fastening part of the back side part of the tape-type disposable diaper described in the section of the prior art. In addition to the tape, it can be applied to other stretchable parts such as a three-dimensional gather.

Hereinafter, various structural forms of the stretchable part for fitting of the present invention will be described in order.
(First form)
FIG. 8 shows a first form of the expansion / contraction part for fitting, and an elongated elastic member 103 is arranged with an interval between adjacent layers 101 and 102 of a sheet-like part 100 having a laminated structure. The two layers 101 and 102 of the layers are intermittently joined in at least the expansion / contraction direction of the elastic member 103 to form a joint portion 104. From the developed state (elongated state) shown in FIG. When the two layers 101 and 102 are contracted (natural length state) due to the contraction of the elastic member 103 shown in b), the portions located between the joints 104 of the both layers 101 and 102 swell in opposite directions, respectively. The ridges 105 and 106 are formed. Moreover, the sheet-like part 100 in this 1st form is a skin side layer in which one layer 101 is located in the skin side, and the other layer 102 is an outer layer located in the outer side of a skin side layer.

  Characteristically, holes 115 penetrating in the thickness direction of the layer are intermittently formed in both sides of the ridge 105 of the skin side layer 101 in the extending direction of the fold 105, and The top portion and the outer layer are not formed with holes penetrating in the thickness direction of the layer. In the fitting stretchable part in which the hole 115 is formed in the side surface portion of the heel 105 as described above, the edge of the hole 115 is difficult to touch the skin, and thus the touch is not easily deteriorated. Moreover, there is little possibility that the edge of the hole 115 rubs against the skin or the outer, and fluffs or fiber waste is generated. Furthermore, the hole 115 is not easily blocked by skin or clothing, and the air permeability through the hole 115 is not easily impaired.

  In particular, in the first embodiment, by forming the hole 115 only in the fold 105 of the skin side layer 101, the skin is not exposed to the outside of the stretchable part for fitting, but the fold 105, Since the space 110 between 106 continues across the elastic member 103 to the edge of at least one of the layers 105 and 106 and opens from this edge, the hole 115 of the skin side layer 101 passes through the holes 105 and 106 of both layers. The air permeability through the space 110 is also excellent. In addition, when this stretchable part for fitting is applied to the stretchable part for fitting by the waist elastic member 24 and the waist elastic member 25 of the above-described pants-type disposable diaper, an adhesive for fixing the curved elastic members 26 and 28 is used. On both sides in the width direction of the interior body 10, the space 110 between the ridges 105 and 106 of both layers 101 and 102 does not open to the edge of the leg-around line 29, but the curved elastic members 26 and 28 are not fixed. It may be opened.

  Moreover, although it was not initially anticipated, when the holes 115 are formed on both side portions of the flange 105, the position of the hole 115 on one side surface portion and the position of the hole 115 on the other side surface portion are as shown in the figure. If it corresponds in the expansion / contraction direction, in the part corresponding to the hole 115 in the extending direction of the flange 105, the top portion of the flange 105 is slightly depressed because the support of the side surface portion is probably reduced. As a result, the contact area between the heel 105 and the skin or the outer is reduced, so that the skin irritation is reduced and the air permeability is further improved. Of course, 襞 105

There is also an advantage that the shape of the left and right is uniform and has a clean appearance. In the illustrated embodiment, the line is symmetrical with respect to the line passing through the apex of the flange 105 (the center line between the joints 104). However, even if it is not symmetrical, it is partially in the direction perpendicular to the expansion / contraction direction. If they overlap with each other, a similar depression is formed.

  Moreover, although the hole 115 in the illustrated form is formed as an “opening” that is an open hole, it may be a “slit” that is a linear hole that is not open (not shown). The shape of the hole 115 can be determined as appropriate. In the illustrated form, the shape is a trapezoidal shape, but it may be an appropriate shape such as a circular shape, an elliptical shape, a rectangular shape, or a polygonal shape. Although the dimension of the hole 115 can be determined as appropriate, the length in the direction orthogonal to the elastic member 103 can be about 40 to 80% of the interval between the adjacent elastic members 103, and the direction along the elastic member 103 Can be less than 2/5, more preferably less than 1/3 of the distance between the joints 104.

  The hole 115 is not particularly limited as long as it is a “side surface portion of the ridge”, but when the edge (groove bottom) of the joint portion 104 on the ridge 105 side is 0% and the ridge 105 (the peak of the mountain is 100%) The preferred position is in the range of 0 to 90%, the more preferred position is in the range of 0 to 70%, and the particularly preferred position is in the range of 0 to 50%.

  The joint portion 104 in the first structure example is intermittent in the expansion / contraction direction, but is continuous in the direction orthogonal to the expansion / contraction direction (however, both layers may not be bonded in a portion overlapping the elastic member). Is formed. In the case of such a joining form, a hot melt adhesive HM is preferable as a joining means as shown in the figure, but means for welding both layers 101 and 102 such as heat sealing and ultrasonic sealing can also be used. .

  The width of each joint 104 in the expansion / contraction direction and the interval between the joints 104 can be determined as appropriate. In normal cases, the width of each joint 104 is preferably about 2 to 5 mm. The interval between the joint portions 104 can be about 10 to 20 mm.

  Further, the elongation rate of the elastic member 103 (when fixed to both layers, that is, in a developed state) can also be determined as appropriate, but in a normal case, it can be about 230 to 320%, particularly about 250 to 300%. .

(Second form)
FIG. 9 shows a second form. In the second embodiment, holes 115 and 116 are formed in both the folds 105 and 106 of the skin side layer 101 and the outer layer 102, respectively, and the holes 115 and the folds of the outer layer 102 are formed in the fold 105 of the skin side layer 101. The holes 116 in 106 are different from those of the first embodiment in that the holes 116 are alternately arranged so as not to overlap each other in the direction orthogonal to the expansion / contraction direction.

  As described above, the holes 115 and 116 are formed in the ridges 105 and 106 of the both layers 101 and 102, but the positions do not overlap (displace) with each other. Although not exposed, the skin side and the opposite side of the fitting stretchable part are the hole 115 of the skin side layer 101, the space 110 between the ridges 105 and 106 of both layers 101 and 102, and the hole of the outer layer 102. It communicates through 116, and air permeability becomes very excellent.

  Since others are the same as that of the 1st form, description is abbreviate | omitted.

(Third form)
FIG. 10 shows a third embodiment. In the third embodiment, holes 115 and 116 are formed in the ridges 105 and 106 of both the skin side layer 101 and the outer layer 102, and the holes 115 and ridges of the outer layer 102 are formed in the fold 105 of the skin side layer 101. 106 is the same as the second embodiment in that the positions of the holes 116 are shifted so as not to overlap with each other, but the hole 115 in the fold 105 of the skin side layer 101 is formed only on one side surface portion of the fold 105 in the expansion / contraction direction. The hole 116 in the heel 116 of the outer layer 102 is formed only on the other side surface portion of the heel 106 in the expansion / contraction direction, whereby the hole 115 in the heel 105 of the skin side layer 101 and the hole 116 in the heel 106 of the outer layer 102 are formed. This is different from the second embodiment in that the positions are shifted so as not to overlap each other.

  As can be seen from the third embodiment, in the present invention, the holes 115 and 116 can be formed only on one side surface of the flanges 105 and 106. Since others are the same as that of the 2nd form, description is abbreviate | omitted.

(4th form)
FIG. 11 shows a fourth embodiment. In the fourth embodiment, holes 115 and 116 are formed in the folds 105 and 106 of both the skin side layer 101 and the outer layer 102, and the holes 115 and the folds of the outer layer 102 are formed in the fold 105 of the skin side layer 101. 106 is the same as the second embodiment in that the positions of the holes 116 are shifted so as not to overlap with each other. However, when the holes 115 and 116 are formed on both side surfaces of the flanges 105 and 106, one side surface portion is formed. The positions of the holes 115 and 116 are shifted from the positions of the holes 115 and 116 on the other side surface so as not to overlap in the expansion / contraction direction. Since others are the same as that of the 2nd form, description is abbreviate | omitted.

(5th form)
In the second to fourth embodiments, the hole 115 in the ridge 105 of the skin side layer 102 and the hole 116 in the ridge 106 of the outer layer 102 are displaced so as not to overlap each other. As shown in the fifth embodiment, the hole 115 in the ridge 105 of the skin side layer 102 and the hole 116 in the ridge 106 of the outer layer 102 can be arranged so as to overlap each other. In the fifth embodiment, on the basis of the first embodiment, a hole 116 is formed at a position facing the hole 115 of the ridge 105 of the skin side layer 101 in the ridge 106 of the outer layer 102. In the illustrated form, the shape and position of the hole 115 in the ridge 105 of the skin side layer 101 and the shape of the hole 116 in the ridge 106 of the outer layer 102 are the same, but the skin side layer 101 can be changed by changing the shape or shifting the position. It is also possible to partially overlap the hole 115 in the ridge 105 and the hole 116 in the ridge 106 of the outer layer 102.

  As can be easily understood from each of the above-described forms, it is sufficient that the holes 115 and 116 are formed in at least one of both the skin-side layer 101 and the outer layer 102. It is also possible to form the holes 116 only in the layer 102.

(Sixth form)
In order to enhance the effect of improving the air permeability, it is desirable that the holes 115 and 116 are openings. However, if the openings are formed by punching, waste material is generated, which is not preferable. This problem can be solved by making the holes 115 and 116 into slits, but in that case, the improvement in air permeability is poor compared to the opening.

  Therefore, as shown in FIG. 13 to FIG. 15, the hole 115 is an opening, but the periphery of the opening forming portion 120 in the flange 105 is separated leaving a part on the joint 104 side (a slit is formed). The opening forming portion 120 extends from the portion left without being separated (the portion connecting both ends of the separation portion 121 in the drawing) into the space 110 between the opposite flange 106 facing the flange 105, A form housed in the space 110 is also proposed (sixth form). In this way, when the opening forming portion 120 is cut apart leaving a part and accommodated in the space 110 formed by the facing portions of the flanges 105 and 106, the opening can be formed without generating waste material.

  In the sixth embodiment, if the opening forming portion 120 is not fixed, there may be a problem that the opening forming portion 120 flutters and the opening closes, gets in the way, or worsens the touch. Therefore, in order to solve these problems, as shown in the figure, with the uncut portion as a crease, the opening forming portion 120 is bent to the inner surface side of the opposing flange 106 and joined to the inner surface of the opposing flange 106. It is preferable. In the illustrated embodiment, this joint is indicated by reference numeral 114. In addition, this form is easy to manufacture. That is, when the layers 101 and 102 are intermittently joined in the expanded state (the elastic member 103 is expanded so that the wrinkles 105 and 106 are not generated in the expansion / contraction direction and the both layers 101 and 102 are expanded), the opening forming portion 120 is formed. In FIG. 14, when the wrinkles are formed as the elastic member 103 contracts by simply joining the two layers 101 and 102, the opening forming portion 120 is automatically formed with the portion left uncut as shown in FIG. It can be bent while being bonded to the inner surface of the opposing flange 106.

  As shown in FIGS. 13A and 15B, the shape of the cut-off portion 121 in the sixth embodiment is not limited to the U-shape as shown in FIGS. 13A and 15B, as long as the uncut portion (portion remaining portion) is formed. As shown in a), an appropriate shape such as an arc shape can be used.

  Also in the sixth embodiment, as shown in FIG. 15B, the holes 115 and 116 can be formed only on one side surface of the flanges 105 and 106. Further, in the sixth embodiment, an opening is formed only in one layer (skin side layer 101) as in the first embodiment, but both layers 101 and 102 are formed as in the second to fifth embodiments. The holes 115 and 116 can also be formed respectively.

(7th form)
In the first to sixth embodiments, as long as the elastic member 103 is fixed to both the layers 101 and 102 (which may be either one), the joining of both the layers 101 and 102 is expanded and contracted as shown in FIG. Can also be intermittent in the direction orthogonal to the direction (seventh embodiment). As long as both ends of the elastic member 103 are fixed to the both layers 101 and 102 (whichever may be one), the joining portion 104 of the seventh embodiment avoids the position where the elastic member 103 passes as shown in the figure. It is desirable to provide it on both sides, in which case a hot melt adhesive can be used as the joining means, but it is desirable to use means for welding both layers, such as heat sealing and ultrasonic sealing. Of course, the joint portion 104 of the seventh embodiment can be continuously formed across the position where the elastic member 103 passes (however, the layers 101 and 102 may not be joined at the portion overlapping the elastic member 103). In this case, it is desirable to use a hot melt adhesive as the joining means, but it is also possible to use means for welding both layers, such as heat sealing and ultrasonic sealing.

  The present invention can be used for absorbent articles.

  B ... Back body, F ... Front body, 10 ... Interior body, 11 ... Liquid permeable top sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Gather elastic member, 20 ... exterior body, 20C ... folded portion, 21 ... side seal portion, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curved elastic member, 28 ... ventral curved elastic member, 29 ... leg circumference line, 13N ... constricted portion, 101 ... skin side layer, 102 ... outer layer, 103 ... elastic member, 104 ... joint, 105, 106 ... collar, 110 ... space, 115, 116 ... hole.

Claims (6)

Elongated elastic members are arranged at intervals between adjacent layers of the sheet-like portion having a laminated structure, and both layers of the adjacent layers are intermittently bonded in at least the expansion / contraction direction of the elastic member to form a bonded portion. And a stretchable portion for fitting, in which the portions located between the joint portions of the two layers swell in opposite directions to form ridges in the contracted state of the two layers accompanying the contraction of the elastic member. In goods,
A hole penetrating in the thickness direction of the layer is intermittently formed in the side surface portion of the ridge in at least one of the two layers in the direction in which the heel extends, and the top portion of the ridge penetrates in the thickness direction of the layer. No hole is formed,
An absorbent article characterized by the above.   The sheet-like portion is a skin side layer in which any one layer is located on the skin side, and the other side layer is an outer layer located on the outside of the skin side layer, and only in the wrinkles of the skin side layer The absorbent article according to claim 1, wherein a hole is formed, and a space between the ridges of both layers is continuous to the edge of at least one layer across the elastic member and opens from the edge.   The sheet-like portion is a skin side layer in which any one layer is in contact with the skin, the other layer is an outer layer located outside the skin side layer, and the holes are respectively formed in the ridges of the both layers. The absorbent article according to claim 1 or 2, wherein the hole in the ridge of one layer and the hole in the ridge of the other layer are arranged so as not to overlap each other.   The said hole is formed in the both side surface part of the collar, respectively, and the position of the said expansion-contraction direction at least partially overlaps the hole of one side part, and the hole of the other side part. The absorbent article according to any one of the above.   The hole is an opening, and the periphery of the opening forming portion of the ridge is separated leaving a part on the joint portion side, and the opening forming portion is opposed to the ridge from the portion left without being separated. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article extends into a space between the heel and the housing and is accommodated in the space.   6. The absorbent article according to claim 5, wherein the opening forming portion is folded to the inner surface side of the opposing ridge with the portion left uncut as a fold, and is joined to the inner surface of the opposing ridge.

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