JP5525954B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper.

Disposable diapers for adults (hereinafter referred to as “diapers”) are roughly divided into tape-type diapers that are fixed and worn with tape from the developed state, and pants-type diapers that can be detached as they are.
As shown in Patent Document 1, the pants-type diaper is formed by joining the back side end and the abdomen side end of the outer sheet of the diaper to form a waist opening and a leg opening. It is a diaper that can be worn in the state of, and can be worn by the wearer himself. A pants-type diaper is required to have a high fit so that the wearer can easily put it on and there is no leakage of excrement. In addition, a wearer who wears a pant-type diaper is more active than a tape-type wearer and is required to easily follow the movement of the body. Therefore, an elastic member is continuously disposed on the periphery of the waist opening and the leg opening of the exterior sheet, and a plurality of elastic members are disposed around the waist between the waist opening and the leg opening. Pants-type diapers that are stretchable are often used (for example, Patent Document 2).

  Pants-type diapers are usually formed by folding the diaper in the center of the exterior sheet in the longitudinal direction and joining the back and abdomen side edges. The distance from the crotch to the waist opening is the distance between the abdomen and the back. The side is almost the same. However, in such a form, when the wearer has a heavy circular back, the exterior sheet on the back side of the wearer's diaper tends to slide down, and is easily exposed from the upper part of the buttocks of the wearer to the waist, or of this part A gap is likely to occur due to the exterior sheet floating. On the other hand, the exterior sheet on the abdomen side tends to be loose. For this reason, there are problems that the feeling of wearing and the appearance at the time of wearing are poor and the leakage of excrement tends to occur.

Japanese Patent Laid-Open No. 61-207605 JP 2009-106667 A

  Therefore, the main problem of the present invention is to provide a pants-type diaper having a structure that is less likely to cause the abdomen of the outer sheet to loosen, the waist to slide down, or lift even when worn by the wearer of the back of the circle. That is.

  The present invention that has solved the above problems is as follows. In addition, the “upward direction” in the present invention indicates the upward direction when wearing the standing position, and the “longitudinal direction” and “width direction” indicate the longitudinal direction and the width direction of the outer sheet of the diaper.

<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. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
In the waist opening, the back body extends upward from the front body,
From both sides of the upper part of the back body, the belt part extends,
The front end portion of the belt portion is configured to be fixed to the outer surface of the front body.
A pants-type disposable diaper characterized by that.

(Function and effect)
The pants-type disposable diaper of the present invention has a structure in which the back body extends upward from the front body in the waist opening. By setting it as such a structure, a wearer's back side is covered widely and exposure of a buttocks upper part or a waist | hip | lumbar part can be reduced. However, only by extending the back body, the fitting property of the extending portion of the exterior sheet to the waist is not high, and a gap is easily generated in the waist. Therefore, in the present invention, it is further possible to fix the extending portion of the back body to the waist by providing belt portions on both sides of the upward extending portion of the back body and fastening the belt portion to the front body. The configuration was made possible. As a result, in the present invention, it is possible to cover the upper part of the buttock and the waist part widely even when worn by a wearer with a circular back, and to prevent the exterior sheet from floating and to reduce leakage.

<Invention of Claim 2>
2. The pant according to claim 1, wherein an upper end of a base end portion of the belt portion is positioned in the vicinity of a waist opening edge of the back body, and a lower end of the base end portion is positioned on a crotch side of the upward extending portion. Type disposable diapers.

(Function and effect)
Since the base end portion of the belt portion is positioned in such an up-and-down range, not only the upper extending portion of the back body but also the upper portion of the back body including the crotch side is integrally fitted to the waist. be able to.

<Invention of Claim 3>
In the front body and the back body, a plurality of elongated waist elastic members extending along the width direction are bonded to the edge of the waist opening at intervals in the vertical direction,
In the back body, three or more elongated waist elastic members extending along the width direction are bonded to the region in the front-rear direction center portion side with respect to the waist elastic member at intervals in the vertical direction. ,
The pants-type disposable diaper according to claim 1 or 2, wherein the front body does not have an elastic member in a region closer to the center in the front-rear direction than the waist elastic member.

(Function and effect)
By adopting a structure that does not have an elastic member at the waist around the front body, the belt fastening portion has a structure that does not have an elastic member, so that there are few surface irregularities and the belt tip is easy to fasten.

<Invention of Claim 4>
The front end of the interior body is spaced from the waist opening of the front body to the crotch side, and has a band-shaped cutout portion surrounded by a perforation at the center in the width direction of the separated portion. The pants-type disposable diaper according to claim 3, wherein the length in the width direction is 30 to 70% of the product width and the length in the longitudinal direction is 1 to 5% of the product length.

(Function and effect)
By making it possible to cut off a part of the belly side member of the exterior sheet, it is possible to reduce the shakiness caused by the surplus portion of the belly side member. In order to make it difficult for leakage from the cut-out portion, the cut-out portion is arranged as far as possible from the absorbent body and arranged in the vicinity of the waist.

<Invention of Claim 5>
The sub belt portion extends from both side portions on the crotch side than the upper extending portion in the rear body, and the tip portion of the sub belt portion is configured to be fixed to the outer surface of the front body. The underpants type disposable diaper of any one of Claims 1-4.

(Function and effect)
By adding such a sub-belt part, it is possible to fix the body shape more appropriately.

<Invention of Claim 6>
The pants-type disposable diaper according to any one of claims 1 to 5, wherein the belt portion is elastically stretchable in the width direction.

(Function and effect)
Fastening is made easier by providing the belt-like member with elasticity.

  As described above, according to the present invention, it is possible to cover the waist part widely from the upper part of the buttocks by the rear body produced in the upward direction, and the extension part is appropriately attached to the waist part by fastening the belt-like member. It becomes possible to fix to. By adopting such a configuration, even when a circular wearer wears it, it is possible to prevent leakage of excrement without impairing the feeling of wearing and the appearance at the time of wearing.

It is a top view (inner surface side) of the expansion state of the underpants type disposable diaper concerning the present invention. It is a top view (outer surface side) of the development state of the underpants type disposable diaper concerning the present invention. It is CC arrow line view of FIG. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. It is a back body side edge part enlarged view (outer side surface) in the expansion | deployment state which shows the other form of a belt-shaped member. (A) A form having a sub-belt part on each side part, and (B) a form having a wide belt part.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1-6 has shown the underpants type disposable diaper of embodiment. This pants-type disposable diaper (hereinafter also simply referred to as a 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 absorbent body 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 positioned at the folding line FL. The pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed is formed by folding and joining both sides thereof by heat welding or hot melt adhesive.

(External sheet structure example)
As shown in FIGS. 3 to 5, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper nonwoven fabric 20A and a lower nonwoven fabric 20B, and the lower nonwoven fabric 20B is disposed between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. Various elastic members are disposed between the nonwoven fabrics of the folded portion 20 </ b> C that is folded back to the inner surface side at the waist opening edge to impart elasticity. The planar shape has a pseudo hourglass shape as a whole by the concave leg periphery cut lines 29 formed to form the leg openings on the both sides of the middle.

  In particular, in the illustrated exterior sheet 20, as the elastic member, in the developed shape shown in FIG. 1, the waist elastic members 24, 24... And a plurality of waist elastic members 25, 25... Arranged in the horizontal direction at intervals, and separately from the waist elastic members 25, 25. Extending from the one-side joint edge to the crotch side, bypassing the crotch side and reaching the other side joint edge of the abdominal part and the dorsal part, and arranged at intervals without crossing each other The curved elastic member groups 26, 28, ... are provided. In addition, in this exterior sheet | seat 20, what is called a leg periphery elastic member substantially continuous along the leg periphery cut line 29 is not provided.

  The waist elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edges 21, 22 where the front body F and the back body B are joined, with an interval 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. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Further, the waist elastic members 24, 24... Shown in the figure are sandwiched between the nonwoven fabrics of the folded portions 20C of the lower layer nonwoven fabric 20B at the waist, but may be sandwiched between the upper nonwoven fabric 20A and the lower layer nonwoven fabric 20B. good.

  The waist elastic member groups 25, 25,... Are elastic rubber-like elastic members disposed in the horizontal direction at intervals in the vertical direction over a range from the upper part to the lower part of the rear body B side end. Yes, the waist part of the back body B is stretched in the width direction so that the diaper is in close contact with the body. Note that the boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, even if the number of elastic members arranged in the horizontal direction with an interval in the vertical direction on the back body B cannot be specified, some on the upper side function as waist elastic members, and the remaining elasticity It is only necessary that the member functions as a waist elastic member.

  In the back body B, the dorsal curved elastic member groups 26, 26... Arranged separately from the waist elastic member groups 25, 25. A plurality of lines arranged along a curve that reaches the crotch part 29, crosses the crotch part, and reaches the other side side joint edge 22 substantially along the opposite leg circumference cut line 29) In the example shown, there are nine elastic rubber-like members, and the dorsal curved elastic member groups 26, 26... Are arranged at intervals without crossing each other. 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 at a predetermined interval.

  The ventral curved elastic member groups 28, 28... Disposed on the front body F of the exterior sheet 20 are also predetermined (from the side joint edge 21 on one side to the crotch side and after crossing the crotch part, In the illustrated example, there are nine thread-like elastic members arranged at intervals without intersecting with the curve (which reaches the side joint edge 21), and these ventral curved elastic member groups 28, 28. Are arranged at intervals without crossing each other. 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 at a predetermined interval.

  Moreover, in the said form example, the waist elastic member groups 25, 25 ... arrange | positioned in the back body B, the curved elastic member 26 ..., and the curved elastic member 28 arrange | positioned in the front body F cross the absorptive main body 10. FIG. Although the portion is cut and discontinuous, it can also be arranged continuously on the absorbent main body 10. By making the elastic member discontinuous on the absorbent main body 10, the absorber 13 can be further prevented from shrinking.

  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. Further, in order to cut the curved elastic members 26, 28,... On the absorbent main body 10 and make them discontinuous, JP-A-2002-35029, JP-A-2002-178428, and JP-A-2002-273808 are disclosed. The described cutting method is preferably employed.

(Front body)
The front body F is made shorter than the back body in the vertical direction so that the feeling of shakiness of the abdominal member is less likely to occur even when worn by a wearer with a circular back. It is desirable that the overall length in the longitudinal direction is shorter than that of a normal pants-type diaper. Specifically, the longitudinal length of the front body F is preferably 300 to 700 mm, particularly preferably 350 to 500 mm. Further, by providing a band-shaped cutout portion 31 surrounded by a perforation line at the lower part of the waistline elastic members 24, 24... Can be reduced. The shape of the cut-out portion 31 can be appropriately selected from shapes such as an ellipse as well as a rectangle as shown in the figure. The size of the cut-out portion 31 is 30 to 70% of the product width in the product width direction and the product length in the product length direction (from the waist opening of the front body F to the waist opening of the back body B in the unfolded state). 1 to 5% of the length in the front-rear direction). In the illustrated example, the cut-out portion 31 includes three nonwoven fabric layers 20A, 20B, and 20C. However, the cut-out portion 31 may have a structure in which all of the three layers can be cut out, or a structure in which only one or two outer layers can be cut out. It is good.

  The front body F may be provided with waist elastic members 25, 25... As with the back body B. However, the looseness of the abdominal member is reduced and the surface 32 is smoothed to provide a later-described fastening part 32. In order to obtain a state suitable for installation, it is preferable that the front body F is not provided with a waist elastic member.

  It is preferable that a fastening portion 32 such as a loop tape capable of locking a belt portion to be described later is disposed outside the front body F. In the embodiment having the cutout portion 32, the fastening portion 32 is preferably disposed below the cutout portion 32. When the hook means of the surface fastener described later is used as a hook tape for a hook-and-loop fastener, the fastening portion 32 is not attached as a separate body, and the upper layer nonwoven fabric 20A itself may be used as a fitting portion. In that case, the hook tape is used as the upper layer nonwoven fabric 20A. It is preferable to use a nonwoven fabric that can be easily locked.

(Back body)
The rear body B has a structure in which the side end portion is longer in the vertical direction by 30 to 150 mm, more preferably 40 to 80 mm longer than the front body F. It is desirable that the overall length in the longitudinal direction is longer than that of a normal pants-type diaper. Specifically, the longitudinal length of the back body B is preferably 350 to 800 mm, particularly preferably 400 to 600 mm. The side part joints 21 and 22 of the front body F and the back body B are provided so that the back body B extends upward from the front body F by the joint. The side joints 21 and 22 are preferably provided so that the lower ends thereof coincide with the lower ends of the side end portions of both body parts.

(Belt part)
As shown in FIGS. 1 and 2, a belt portion 33 is fixed to the outer side surface of the back body B with a hot melt adhesive or the like so as to extend from both side portions of the upper extending portion. The belt portion 33 may not have elasticity, but preferably has elasticity in order to prepare more fastening. In the example of illustration, the belt part 33 consists of a nonwoven fabric of two layers, and has a stretching property in the longitudinal direction by arrange | positioning the thread-like elastic members 34 and 34 ... between layers. The belt portion 33 may be a stretchable nonwoven fabric, a film-like rubber, an elastomer, or the like, and a material having stretchability.

  The belt portion 33 is preferably arranged so that the upper end thereof is located at 0 to 50 mm, particularly 0 to 30 mm from the waist opening edge. When the belt portion 33 is disposed at a position exceeding 60 mm from the waist opening edge, it is difficult to appropriately fix the portion extending above the back body to the waist. Moreover, it is preferable to arrange | position the belt part 33 so that the edge part of the exterior sheet width direction center side may come to the position of 50-90 mm from the exterior sheet side edge.

  Locking means 35 such as hook tape of a hook-and-loop fastener is disposed on the inner side surface of the front end portion of the belt portion 33. As shown in FIG. 6, by locking the locking means 35 to the fastening portion of the front body F, the extending portion above the back body B can be fixed to the waist.

  Another form of the belt portion 33 is shown in FIG. In addition to the belt portion 33, one or more auxiliary belt portions 36 may be disposed (FIG. 7A), and the belt portion 33 may have a wide structure (FIG. 7B). The total width of the belt portion 33 and the sub belt portion 36 is preferably 20 to 90%, particularly preferably 30 to 80%, of the length of the rear body side end in the vertical direction.

(Abstract structure example)
As shown in FIGS. 4 and 5, the absorbent main body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excreted liquid that has permeated through the top sheet 11 is absorbed and held.

  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. 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 absorbent main body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIG. 4, a nonwoven fabric made into a double sheet by folding is preferably used, and is wound by the liquid-permeable surface sheet 11. The side edge portion of the absorbent body 13 is further rolled up 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 elastic 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 elastic force as shown by a two-dot chain line in FIG. 4 in the product state. 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, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like 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. 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.

  The present invention can be applied to a disposable diaper for infants as well as an adult pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... String-like elastic Elastic member, 20 ... exterior sheet, 20C ... exterior sheet folded portion, 21, 22 ... side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curved elastic member, 28 ... ventral side Curved elastic member, 29 ... leg-around cut line, 31 ... cut-out portion, 32 ... fastening portion, 33 ... belt portion, 35 ... locking means, 36 ... sub-belt portion.

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. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
In the waist opening, the back body extends upward from the front body,
From both sides of the upper part of the back body, the belt part extends,
The front end portion of the belt portion is configured to be fixed to the outer surface of the front body.
A pants-type disposable diaper characterized by that.   2. The pant according to claim 1, wherein an upper end of a base end portion of the belt portion is positioned in the vicinity of a waist opening edge of the back body, and a lower end of the base end portion is positioned on a crotch side of the upward extending portion. Type disposable diapers. In the front body and the back body, a plurality of elongated waist elastic members extending along the width direction are bonded to the edge of the waist opening at intervals in the vertical direction,
In the back body, three or more elongated waist elastic members extending along the width direction are bonded to the region in the front-rear direction center portion side with respect to the waist elastic member at intervals in the vertical direction. ,
The pants-type disposable diaper according to claim 1 or 2, wherein the front body does not have an elastic member in a region closer to the center in the front-rear direction than the waist elastic member.   The front end of the interior body is spaced from the waist opening of the front body to the crotch side, and has a band-shaped cutout portion surrounded by a perforation at the center in the width direction of the separated portion. The pants-type disposable diaper according to claim 3, wherein the length in the width direction is 30 to 70% of the product width and the length in the longitudinal direction is 1 to 5% of the product length.   The sub belt portion extends from both side portions on the crotch side than the upper extending portion in the rear body, and the tip portion of the sub belt portion is configured to be fixed to the outer surface of the front body. The underpants type disposable diaper of any one of Claims 1-4.   The pants-type disposable diaper according to any one of claims 1 to 5, wherein the belt portion is elastically stretchable in the width direction.

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