JP2010194257A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that the thickness of a diaper is increased thicker than the surrounding and the diaper becomes harder and lateral wrinkles are generated in the inner face of the interior body in an area where curved elastic members and the interior body overlap with each other. <P>SOLUTION: In the pant type disposable diaper in which the curved elastic members 26, 28 extending from both the sides of a front body part F and the back body part B to sites where the curved elastic members overlaps with at least both the sides of the interior body 10 while curving so as to go to the opposite body part sides while going toward the center in a width direction are fixed to an exterior sheet 20 in an extending state, the diaper has crossing parts 70 where acute angle side crossing angle θ of the curbed elastic members 26, 28 and the longitudinal direction becomes 60° or less in the area where the curved elastic members 26, 28 and both the side parts of the interior body 10 overlap with each other in a state of developing the diaper, and the exterior sheet 20 and the interior sheet 10 are not fixed in the longitudinal range of 80% or more of the crossing parts 70. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pants-type disposable diaper excellent in fit, in which an increase in the thickness of a side portion of an interior body or the vicinity thereof, hardening, occurrence of a recumbent, and a lateral leakage through a recumbent are suppressed.

The 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, fixing various elastic members to the exterior sheet in an expanded state (see, for example, Patent Documents 1 to 6), The one provided with the waist elastic member, the waist elastic member, and the curved elastic member (represented in Patent Document 6) has a relatively high fit to the body. However, providing a large number of elastic members is accompanied by an increase in the fixing area, and the flexibility of the exterior sheet is inevitably lowered.

JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-043415 A

In view of these problems, while developing a flexible and comfortable pant-type diaper, the thickness of the diaper increases compared to the surrounding area in the region where the curved elastic member and both sides of the interior body overlap, and it is harder. In addition, I found out that there was a recumbency on the inner surface of the interior. Such a problem is not preferable because there is a possibility that the crotch part may deteriorate in wearing feeling and cause side leakage.
Therefore, the main problem of the present invention is to solve this problem.

  As a result of intensive studies on the above problems, the present inventors have obtained the following knowledge. That is, in the conventional one, an acute angle between the curved elastic member (tangent direction in the case of a portion arranged in a curved shape) and the vertical direction in a region where the curved elastic member and both side portions of the interior body overlap. Since the exterior sheet and the interior body are fixed over substantially the entire longitudinal range of the intersecting portion, the contraction force of the curved elastic member is reduced by the interior body. As a result, the thickness of the diaper increases and becomes harder in the area where the curved elastic member and both sides of the interior body overlap, and there is also horizontal recumbency on the inner surface of the interior body. Was. The present invention described below is based on such knowledge.

<Invention of Claim 1>
By including 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, the front body and the back body of the exterior sheet are joined at both sides. A waist opening and a pair of left and right leg openings are formed,
Extending from the both sides of at least one of the front body and the back body to the portion overlapping the at least both sides of the interior body while being curved toward the opposite body side toward the center in the width direction. In the pants-type disposable diaper where the curved elastic member that is fixed in the stretched state,
In a state where the diaper is deployed, an intersecting portion in which an acute angle crossing angle between the curved elastic member and the longitudinal direction is 60 ° or less is provided in a region where the curved elastic member and both side portions of the interior body overlap. And the exterior sheet and the interior body are non-fixed in a vertical range of 80% or more of the intersecting portion.
A pants-type disposable diaper characterized by that.

(Function and effect)
In this way, 80% or more of the longitudinal direction of the intersecting portion where the acute angle crossing angle between the curved elastic member (the tangential direction in the case of a curved portion) and the longitudinal direction is 60 ° or less. In the range, the exterior sheet and the interior body are not fixed, so that the contraction force of the curved elastic member is hardly or not applied to the side portion of the interior body. Even in the overlapping region, the thickness and hardness of the diaper are approximately the same as the surroundings, and recumbency is less likely to occur on the inner surface of the interior body.

<Invention of Claim 2>
In a state where the diaper is deployed, the position in the vertical direction is the same range as the intersecting portion and the waist side of the intersecting portion,
A non-stretchable region not having an elastic member and having the exterior sheet and the interior body fixed thereto is provided on the widthwise center side of the intersecting portion in the same range as the intersecting portion in the vertical direction. And
The vertical position is a non-stretchable region having no elastic member from the width direction outer side to the width direction center side of the intersecting portion from the width direction center side edge of the intersecting portion in the range on the waist side of the intersecting portion. The pants-type disposable diaper according to claim 1, wherein a region where the exterior sheet and the interior body are fixed is provided.

(Function and effect)
In the present invention, in the same vertical range as the intersecting portion, the fixing area between the exterior sheet and the interior body is reduced. Therefore, in the range on the waist side of the intersecting portion, as described above, the center side edge in the width direction of the intersecting portion If the fixing region is provided from the outer side in the width direction to the center side in the width direction of the intersecting portion, it is preferable that the inner body is more firmly fixed.

<Invention of Claim 3>
A plurality of the curved elastic members are arranged in the front body and the back body without any crossing each other,
The group of curved elastic members arranged on the front body side and the group of curved elastic members arranged on the back body side are separated in the vertical direction without intersecting each other,
In this longitudinally separated range, it is a non-stretchable region that does not have an elastic member from the width direction outer side to the width direction center side of the intersecting portion than the width direction center side edge of the intersecting portion, and the exterior sheet and the interior The pants-type disposable diaper according to claim 2, wherein a fixed region to which the body is fixed is provided.

(Function and effect)
As described above, the curved elastic members are arranged on both the front and rear bodies, and the longitudinally separated range is secured without intersecting the front and back curved elastic members with each other. By providing the fixing region from the outer side in the width direction to the center side in the width direction of the intersecting portion than the center side edge, the fixing of the interior body can be further strengthened.

<Invention of Claim 4>
As the curved elastic member, three or more elongated elastic members having a thickness of 400 to 1500 dtex are fixed to the front body and the back body at a stretch rate of 150 to 300%, respectively, and adjacent curved elastic members in the intersecting portion. The pants type disposable diaper of Claim 3 whose mutual space | interval is 30 mm or less.

(Function and effect)
When the bending member has such a thickness, elongation rate, number, and mutual interval, the contraction force in the vertical direction concentrates particularly strongly at the intersection. Therefore, the present invention is suitable for such a case.

<Invention of Claim 5>
The front body and the back body of the exterior sheet are vertically arranged in a waist elastic member disposed along the width direction at the edge of the waist opening, and in a region on the center side in the front-rear direction than the waist elastic member. The pants-type disposable diaper according to claim 4, further comprising a plurality of waistline elastic members arranged along the width direction at intervals in the direction.

(Function and effect)
The present invention is suitable for such a pants-type disposable diaper.

<Invention of Claim 6>
The outer packaging sheet is formed by bonding one or more nonwoven fabrics, and the outermost nonwoven fabric located on the outermost side has a twist of 3.8 gf · cm / cm or less. Pants-type disposable diapers.

(Function and effect)
This invention is based on the knowledge that the suppleness of the outermost nonwoven fabric among the exterior sheets has a strong influence on the suppleness of the diaper as a whole. Since the thin sheet nonwoven fabric has been generally used as the exterior sheet, this finding was unexpected at first, but it can be reasonably understood considering that the outer sheet has a larger deformation amount. is there. Currently, a spunbonded nonwoven fabric is widely used as the outermost nonwoven fabric of the exterior sheet from the viewpoint of strength. However, the conventional outermost nonwoven fabric has a high degree of twist and is inferior in flexibility. On the other hand, as described above, when a non-woven fabric having a sufficiently low twist is used as the outermost non-woven fabric, the flexibility of the entire diaper is remarkably increased. As a result, skin troubles such as itching and rash are alleviated and it is easy to take off and the like.
The “twisting degree” in the present invention can be measured using, for example, KES-YN1 (manufactured by Kato Tech Co., Ltd.), and the smaller the value, the more flexible the twisting is. To do. Moreover, when an exterior sheet | seat consists of one nonwoven fabric, it itself means an outermost nonwoven fabric.

  As described above, according to the present invention, there are advantages such as increasing the thickness of the side portion of the interior body or the vicinity thereof, making it hard, suppressing the occurrence of recumbent and lateral leakage through recumbent.

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 principal part top view of the underpants type disposable diaper of an unfolded state. 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 graph which shows the test result of MIU / MMD and a twist degree. It is a graph which shows the test result of a twist degree and a bending resistance. It is a graph which shows the test result of compression hardness LC, compression work WC, compression resilience RC, and bending resistance.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1-7 has shown the underpants type disposable diaper 1 of embodiment. This pants-type disposable diaper 1 (hereinafter also simply referred to as diaper) has an exterior sheet 20 having a front body F and a back body B, and an interior body 10 fixed and integrated on the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. The waist opening and a pair of left and right leg openings are formed by folding at the center in the longitudinal direction (front-rear direction), which is the boundary of B, and joining both sides thereof by heat welding or hot melt adhesive. A pants-type disposable diaper.

(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a non-woven sheet having a two-layer structure including an upper layer nonwoven fabric 20A and a lower layer nonwoven fabric 20B (that is, the lower layer nonwoven fabric is the outermost nonwoven fabric in this embodiment). Various elastic members are disposed between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B, and between the nonwoven fabrics of the folded portion 20C formed by folding the lower layer nonwoven fabric 20B to the inner surface side at the waist opening edge, thereby imparting elasticity. The planar shape has a pseudo hourglass shape as a whole by concave leg-around lines 29 formed to form leg openings on both sides of the middle.

  In particular, in the illustrated exterior sheet 20, as the elastic member, in the developed shape shown in FIGS. 1 to 3, the waist elastic members 24, 24. The back body B has a plurality of waist elastic members 25, 25... Arranged at intervals in the vertical direction along the width direction, and the waist elastic members in the front body F and the back body B respectively. Separately from the groups 25, 25..., Both sides of the interior body 10 are curved toward the opposite body side toward the center of the width direction from the joint edge on both sides joining the front body F and the back body B. A plurality of curved elastic members 26, 28, which extend to the overlapping portion and are arranged at intervals without crossing each other are provided. In addition, in this exterior sheet 20, what is called a leg periphery elastic member substantially continuous along the leg periphery line 29 is not provided.

  The waist elastic members 24, 24... Are disposed in the vicinity of the waist opening edge in the range of the side joint edges 21 and 22 where the front body F and the back body B are joined, with a space in the vertical direction. A plurality of thread rubber-like elastic members for attaching a diaper to the body by applying an expansion / contraction force so as to tighten around the waist of the body. As the waist elastic member 24, thread rubber is used in the illustrated example, but a tape-like elastic member may be used, for example. Moreover, although the waist part elastic members 24, 24 ... of an illustration form are clamped between the nonwoven fabrics of the folding | returning part 20C of the lower layer nonwoven fabric 20B in a waist part, even if it clamps between 20 A of upper layer nonwoven fabrics, and the lower layer nonwoven fabric 20B. good.

  The waist elastic members 25, 25... Are elastic rubber members arranged along the width direction at intervals in the vertical direction over a range from the upper part to the lower part of the side joint edges 21, 22. It is an elastic member, and applies elastic force in the width direction to the waist portions of the front body F and the back body B, respectively, to bring the diaper into close contact with the body. The boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side 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 members 26, 26... Arranged separately from the waist elastic members 25, 25... Have an acute angle crossing angle θ (hereinafter referred to as the vertical direction) with the vertical direction in the middle in the longitudinal direction. A predetermined curve in which the vertical crossing angle θ increases within a range of 0 ° to 90 ° from the minimum point toward the both sides in the width direction, and In a state where the diaper is unfolded, it is arranged along a predetermined curve having an intersecting portion 70 having a longitudinal crossing angle θ of 60 ° or less in a region overlapping with both side portions of the interior body. 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, there are five elastic rubber-like elastic members, and these dorsal curved elastic members 26, 26. They are arranged at intervals without crossing. The dorsal curved elastic member groups 26, 26,... Are arranged so as to form a predetermined expansion / contraction zone, instead of arranging a few elastic expansion / contraction members at a close interval and substantially as one bundle. Three or more, preferably five or more are arranged with an interval of about 5 to 25 mm, preferably about 5 to 16 mm.

  In the front body F of the exterior sheet 20, the ventral curved elastic members 28, 28... Arranged separately from the waist elastic member groups 25, 25. Is a predetermined curve in which the longitudinal crossing angle θ increases within the range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded In the region overlapping the both side portions of the interior body, the vertical crossing angle θ is arranged along a predetermined curve having a crossing portion 70 having a value of 60 ° or less. There may be one ventral curved elastic member 2826, but a plurality of ventral curved elastic members 2826 are preferable. In the illustrated example, there are five thread-like elastic members, and these ventral curved elastic members 28, 28. Without being spaced apart. The ventral curved elastic member groups 28, 28... Are also arranged so as to form a predetermined expansion / contraction zone, instead of arranging a few elastic expansion / contraction members at a close interval and substantially as one bundle. Three or more, preferably five or more are arranged with an interval of about 5 to 25 mm, preferably about 5 to 16 mm.

  In the illustrated example, the waist elastic members 25, 25... And the curved elastic members 26, 28... Disposed in the front body F and the back body B are not provided in a portion crossing the interior body 10. This portion is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. For example, as the latter example, the waist elastic members 25, 25... And the curved elastic members 26... 28 are crossed from the side joint edge 22 on one side across the interior body 10 and on the other (opposite) side. After providing continuously to the joining edge 22, the general form which cut | disconnects part or all of the part which traverses the interior body 10, and makes it discontinuous is contained. By making the elastic member discontinuous at the portion overlapping the interior body 10, it is possible to further prevent the interior body (particularly the absorber 13) from contracting in the width direction. Of course, the waist elastic members 25, 25... And the curved elastic members 26, 28... Can be continuously arranged across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 ... 28 on the interior body 10 and to make it discontinuous, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. The cutting method to be used is preferably employed.

Unlike the illustrated example, the curved elastic member may be provided only on one of the front body F and the back body B. Further, when the curved elastic members 26, 28,... Are provided on both the front body F and the back body B, a part or all of the group of curved elastic members arranged on the front body F side and the back body B side are provided. Although a form (not shown) in which a part or all of the group of the curved elastic members B arranged can be adopted, the group of the curved elastic members 28 arranged on the front body F side as in the illustrated example, Further, a configuration in which the group of the curved elastic members B arranged on the back body B side is separated in the longitudinal direction at a position slightly deviated from the middle part in the front-rear direction, particularly the front body F without crossing each other, is preferable. The minimum vertical separation distance in the vertical separation range 90 is preferably about 5 to 20 mm, and a wide fixed region described later is preferably provided in this portion.
Further, the curved elastic members 26, 28,... May not be entirely curved as in the illustrated example, and may partially have a linear portion.

(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.

  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 material, for example, a pulp fiber stack, a collection of filaments such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. 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 absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  It is preferable that solid gather BSs that fit around the legs are formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIG. 6 and FIG. 7, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... The thread-like elastic stretch members 16, 16... Are for forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge by elastic stretch force as shown by a two-dot chain line in FIG. It is.

  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 thread-like elastic elastic member 16, a commonly used material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, natural rubber, or the like is used. it can. 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. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  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.

(Fixing the interior and exterior sheets)
The interior body 10 and the exterior sheet 20 are fixed to each other with a characteristic structure. As shown in FIG. 3, when the diaper is unfolded, the intersecting portion 70 (enclosed by a two-dot chain line in FIG. 3) where the acute angle side crossing angle θ between the curved elastic members 26, 28,. The outer sheet 20 and the inner body 10 are not fixed in the vertical range (in the illustrated example, the entire vertical range) of 80% or more of the portion 80, 81, 82 other than this. The exterior sheet 20 and the interior body 10 are fixed by a joining means such as a hot melt adhesive. As a result, the contraction force of the curved elastic members 26, 28, ... is hardly or not applied to the side portion of the interior body 10, and as a result, the curved elastic members 26, 28 ... overlap with both side portions of the interior body 10. Also, the thickness and hardness of the diaper are approximately the same as the surroundings, and recumbency is less likely to occur on the inner surface of the interior body 10. In addition, as long as 80% or more of the vertical range of the intersecting portion 70 is a fixed portion, not only a form in which the entire portion is continuously fixed as in the illustrated example, but also a portion of the intersecting portion is not fixed. It is also possible to fix it intermittently within the intersection.

  On the other hand, as described above, when the non-fixed region 71 is provided in the range including the intersecting portion 70, the fixed region between the exterior sheet 20 and the interior body 10 is inevitably reduced in the same vertical range as the intersecting portion 70. . Therefore, in a state where the diaper is unfolded and the position in the vertical direction is the same as that of the intersecting portion 70, a non-stretchable region not having an elastic member is provided on the center side in the width direction of the intersecting portion 70 and the portion is attached to the exterior sheet 20. In the range where the longitudinal position is on the waist side of the intersecting portion 70 from the width direction center side edge of the intersecting portion 70 to the width direction center side of the intersecting portion 70, the fixing region 80 with the interior body 10 is used. It is desirable to provide a non-stretchable region that does not have an elastic member and to use that portion as a fixing region 81 between the exterior sheet 20 and the interior body 10. Specifically, as in the illustrated example, the fixed width between the exterior sheet 20 and the interior body 10 is set to be equal to or less than the interval between the intersecting portions 70 on both sides in the width direction in the same vertical range as the intersecting portion 70. On the waist side, it is proposed to make it wider (may be enlarged stepwise as in the illustrated example or may be enlarged continuously). Thereby, fixation of the interior body 10 becomes stronger.

  Moreover, while arrange | positioning the curved elastic members 26 ..., 28 ... in the front body F and the back body B, respectively, while ensuring the vertical direction separation | spacing range 90 without making the front and back curved elastic members 26 ..., 28 ... cross mutually, Also in this longitudinally spaced region 90, a non-stretchable region not having an elastic member is provided from the width direction outer side to the width direction center side of the intersecting portion 70 with respect to the width direction center side edge of the intersecting portion 70, and this portion is provided as an exterior sheet. It is also proposed that the fixed width 82 in the vertical direction separation range 90 is made wider than the fixed width in the same vertical direction range as the intersecting portion 70 as the fixed region 82 between the inner body 20 and the interior body 10. Thereby, fixation of the interior body 10 can be made still stronger.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 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 sheet 20 on the inner surface of the diaper 1 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 non-woven fabric constituting the exterior sheet)
Of the non-woven fabrics constituting the exterior sheet 20, at least the outermost non-woven fabric 20B preferably has a twist degree of 3.8 gf · cm / cm or less. It is desirable to employ the same nonwoven fabric as the outermost nonwoven fabric 20B for all the nonwoven fabrics constituting the exterior sheet 20, that is, the other nonwoven fabrics 20A, 50, 60 that are not located on the outermost side (the same applies hereinafter). In this way, if a nonwoven fabric with a sufficiently low twist is used, the flexibility of the diaper as a whole is significantly increased. In addition, there are advantages such as easy removal and attachment. If the degree of twist is not sufficiently low, the effect of improving flexibility is not exhibited. Such a twist degree can be achieved, for example, by selecting the type of raw fiber, reducing the fineness, shortening the fiber length, reducing the basis weight or thickness, and the like.

  Further, the ratio MIU / MMD between the average surface friction coefficient and the average deviation in the outermost nonwoven fabric 20B is preferably 20 or more, and more preferably 25 or more. By sufficiently increasing the MIU / MMD ratio, the feel of the exterior sheet surface is improved, so that the suppleness is compensated, and skin troubles such as itching and rash due to rubbing with the skin are further reduced. become. Such an MIU / MMD ratio can be achieved, for example, by reducing the fineness or performing surface processing.

In addition, the outermost nonwoven fabric 20B has a thickness when the basis weight is 10 to 30 g / m ² and the pressure is 0.5 g / cm ² so as not to impair the basic functions (hiding function, strength, etc.) as the exterior sheet 20. It is preferable that T0 is 0.1 to 1.0 mm. A more preferable basis weight is 13 to 22 g / m ² , and a thickness T0 is 0.1 to 0.5 mm.

  Furthermore, in order to compensate for flexibility, the bending resistance of the outermost nonwoven fabric 20B according to JIS-L-1096 (45 degree cantilever method) is preferably 45 mm or less, and more preferably 35 mm or less. Thereby, the reduction of the feeling of tingling and the ease of putting on and taking off become even more preferable. Such bending resistance can be achieved, for example, by selecting the type of raw fiber, changing the ratio, lowering the embossing pressure, reducing the basis weight or thickness, and the like.

  Since the strength tends to decrease when the flexibility is improved, the outermost nonwoven fabric 20B has a tensile strength defined in JIS-P-8113 of 40 to 120 kgf / m in the width direction, particularly 60 to 100 kgf / m, in the front-rear direction. It is preferably 10 to 80 kgf / m, particularly 25 to 60 kgf / m, and the tear strength specified in JIS-P-8116 is preferably 4 to 30 kgf / m, particularly 8 to 25 kgf / m in the front-rear direction. Such tensile strength and tear strength can be achieved, for example, by increasing the degree of entanglement between fibers.

  The compression characteristics of the outermost nonwoven fabric 20B are also closely related to flexibility. Therefore, the compression characteristics of the outermost nonwoven fabric 20B are such that the compression hardness LC is 0.3 to 1.0, particularly 0.5 to 0.9, and the compression work WC is 0.01 to 0.10. The compression resilience RC is preferably 20 to 90%, particularly preferably 25 to 70%. Such compression hardness LC, compression work WC, and compression resilience RC can be achieved, for example, by selecting the type of raw fiber, changing the ratio, reducing the basis weight, and the thickness.

  The outermost nonwoven fabric 20B is not particularly limited with respect to the material, structure, manufacturing method, fineness, fiber length (short fiber, filament), and the like of the raw fiber. For example, the raw fiber can be appropriately selected from olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and the fiber structure is parallel. It can be suitably selected from two-layer type composite fibers such as molds and core-sheath types, multilayer type composite fibers, non-composite fibers, mixed fibers, and split fibers. Furthermore, as a manufacturing method, it can select and use suitably from well-known methods, such as the spunlace method, the spun bond method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method. Known specifications can be adopted for the fineness and fiber length of the fiber, but the fineness is preferably 0.7 to 3 dtex, particularly 1 to 2.5 dtex.

  Various nonwoven fabric samples were prepared and subjected to various tests and measurements. The constituent fibers of each sample nonwoven fabric are all continuous fibers (long fibers) as can be seen from the production method, and the fiber diameters are all measured by microscopic observation. As a result, they are almost the same thickness (about 0.15 to 0.25 μm). )Met. In accordance with the Gakushin type friction test specified in JISK6404-16, the fluff test is performed on a non-woven fabric sample using a friction cloth covered with a dry white cotton cloth, and the fluff state is observed with a microscope. 1: The height of the fluffy fiber is 1 mm or less, 2: The height of the fluffy fiber is 2 mm or less, 3: The height of the fluffy fiber is 3 mm or less, 4: The amount of fluff is not large, but The height is 3 mm or more, 5: The amount of fluff is large and the entire surface is fluffed, and the height of the fluffy fiber is 3 mm or more. The MIU / MMD ratio was calculated by (MIU (width direction) + MIU (front-rear direction)) / (MMD (width direction) + MMD (front-rear direction)). Other conditions (adhesive usage, etc.) not specifically mentioned were common to all samples.

  Furthermore, each sample nonwoven fabric is used as the nonwoven fabric 20A, 20B, 51, 61 of the exterior sheet 20 in the pants-type disposable diaper having the structure shown in FIGS. 1 to 7, and a pants-type disposable diaper similar to that shown in the figure is used. It was prepared and subjected to sensory evaluation on the suppleness of the diaper (◯: rich in suppleness, △: normal, ×: stiff).

  The above results are summarized in Table 1. Also, some graphs are shown in FIGS. As is clear from these results, Samples 1 to 9 were rich in flexibility as diapers. Among them, the sensory evaluation of those having MIU / MMD of 20 or higher was high, and among them, the sensory evaluation of those having a bending resistance of 35 mm or less was high.

  The present invention can be used in a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn-like elastic stretch 20 ... exterior sheet, 21.22 ... side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curve elastic member, 28 ... ventral curve elastic member, 29 ... leg circumference Line, 20C ... exterior sheet folded portion, 70 ... intersection, 71 ... non-fixed region, 80, 81, 82 ... fixed region, [theta] ... longitudinal crossing angle, F ... front body, B ... back body.

Claims (6)

By including 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, the front body and the back body of the exterior sheet are joined at both sides. A waist opening and a pair of left and right leg openings are formed,
Extending from the both sides of at least one of the front body and the back body to the portion overlapping the at least both sides of the interior body while being curved toward the opposite body side toward the center in the width direction. In the pants-type disposable diaper where the curved elastic member that is fixed in the stretched state,
In a state where the diaper is deployed, an intersecting portion in which an acute angle crossing angle between the curved elastic member and the longitudinal direction is 60 ° or less is provided in a region where the curved elastic member and both side portions of the interior body overlap. And the exterior sheet and the interior body are non-fixed in a vertical range of 80% or more of the intersecting portion.
A pants-type disposable diaper characterized by that. In a state where the diaper is deployed, the position in the vertical direction is the same range as the intersecting portion and the waist side of the intersecting portion,
A non-stretchable region not having an elastic member and having the exterior sheet and the interior body fixed thereto is provided on the widthwise center side of the intersecting portion in the same range as the intersecting portion in the vertical direction. And
The vertical position is a non-stretchable region having no elastic member from the width direction outer side to the width direction center side of the intersecting portion from the width direction center side edge of the intersecting portion in the range on the waist side of the intersecting portion. The pants-type disposable diaper according to claim 1, wherein a region where the exterior sheet and the interior body are fixed is provided. A plurality of the curved elastic members are arranged in the front body and the back body without any crossing each other,
The group of curved elastic members arranged on the front body side and the group of curved elastic members arranged on the back body side are separated in the vertical direction without intersecting each other,
In this longitudinally separated range, it is a non-stretchable region that does not have an elastic member from the width direction outer side to the width direction center side of the intersecting portion than the width direction center side edge of the intersecting portion, and the exterior sheet and the interior The pants-type disposable diaper according to claim 2, wherein a fixed region to which the body is fixed is provided.   As the curved elastic member, three or more elongated elastic members having a thickness of 400 to 1500 dtex are fixed to the front body and the back body at a stretch rate of 150 to 300%, respectively, and adjacent curved elastic members in the intersecting portion. The pants type disposable diaper of Claim 3 whose mutual space | interval is 30 mm or less.   The front body and the back body of the exterior sheet are vertically arranged in a waist elastic member disposed along the width direction at the edge of the waist opening, and in a region on the center side in the front-rear direction than the waist elastic member. The pants-type disposable diaper according to claim 4, further comprising a plurality of waistline elastic members arranged along the width direction at intervals in the direction.   The outer packaging sheet is formed by bonding one or more nonwoven fabrics, and the outermost nonwoven fabric located on the outermost side has a twist of 3.8 gf · cm / cm or less. Pants-type disposable diapers.

Images