JP2018161266A - Pants-type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pants-type disposable diaper that can prevent excessive swelling to the front with the deformation of an absorber when a wearer pulls down the front body of the pants-type disposable diaper.SOLUTION: A pants-type disposable diaper includes an exterior body 20 for configuring a front body F and a back body B individually or together, an absorber 13 provided inside the exterior body 20 so as to extend over the back body B from the front body F, and a top sheet 11 for covering up the absorber 13 from the skin side. In the pants-type disposable diaper, both side edges of the exterior body of the front body and both side edges of the exterior body of the back body are joined to form a side seal part, and thereby a waist opening and a pair of left and right leg openings are formed. In the absorber 13, at least one grooved embossment 17a, 17b along the width direction is formed in each of the skin side and the garment side of the front body part F.SELECTED DRAWING: Figure 2

Description

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

  A pants-type disposable diaper (hereinafter, also simply referred to as a diaper) is an absorption body that is individually or integrally configured as a front body and a back body, and is attached to the inner surface of the exterior body so as to extend from the front body to the back body. An interior body including a body and a top sheet that covers the absorbent body from the skin side, and both side edges of the front body exterior body and both side edges of the back body exterior body are joined to form a side seal portion In general, a waist opening and a pair of left and right leg openings are formed.

  The interior body attached to the inner surface of the exterior body so as to cover the front body of the pants-type disposable diaper contains an absorbent body and has a bulge forward. When urinating, the absorber is deformed by pulling down, and the front body part of the diaper further swells forward and bulges out. When urination is performed in this state and the remaining urine cannot be discharged forward, there is a problem that the remaining urine is applied to the outer surface of the diaper and the outer surface becomes dirty. In particular, it tends to be a problem when a man with weak urination, such as enlarged prostate, urinates in a standing position.

  Therefore, for example, even when a man with low urination momentum stands up and urinates, a pants-type disposable diaper that prevents the residual urine from dripping and the outer surface of the diaper from becoming dirty due to the pants-type disposable diaper being pulled down. It is desired.

  Conventionally, embossing itself to an absorbent body of a pants-type disposable diaper is known (Patent Documents 1 and 2).

JP 2012-143535 A JP 2004-016648 A

  However, the embossing is intended mainly for the diffusion of urine, and does not attempt to solve the above problems.

  Then, the main subject of this invention is providing the disposable diaper which can prevent the excessive swelling to the front accompanying the deformation | transformation of an absorber when a wearer pulls down the front body of a pants type disposable diaper.

The pants-type disposable diaper of the present invention that has solved the above problems is
The front body and the back body are individually or integrally configured exterior body, provided inside the exterior body so as to extend from the front body to the back body, and a top sheet that covers the absorber from the skin side,
A pants-type disposable diaper having a waist opening and a pair of left and right leg openings formed by joining side edges of the outer body of the front body and both side edges of the outer body of the rear body to form a side seal part In
The absorbent body is characterized in that at least one groove-shaped emboss is formed along the width direction on each of the skin side and the clothing side of the front body part.

The pants-type disposable diaper according to the present invention can provide a disposable diaper that prevents excessive bulging forward due to deformation of the absorbent body when the wearer pulls down the front body of the pants-type disposable diaper. .
Since the absorbent body has at least one groove-like embossment formed along the width direction on the skin side and the clothing side of the front body part, the wearer pulled down the front body of the pants-type disposable diaper. At the same time, it bends at the embossed boundary, and since the emboss is formed on each of the skin side and the clothing side, it bends like a bellows.
As a result, it is possible to prevent excessive swelling in the direction of urination in the front body accompanying the deformation of the absorber in the conventional example.

In addition, the said embossing can be set as the structure currently formed in the skin side and the clothing side alternately.
In this form, there is usually a tendency to bend with embossed valleys, so forming alternately on the skin side and clothing side will sequentially change the bending direction in the longitudinal section, so the absorber There is an advantage that the amount of bulging is small in the direction of urination of the front body accompanying the deformation of the body.

The embossing can be configured such that one end thereof does not reach the side surface in the width direction of the absorber.
When urine diffuses in the width direction along the emboss, the cause of the side leakage can be eliminated because the emboss does not reach the side surface in the width direction of the absorber.

  The emboss may not be formed in the middle of the absorbent body in the width direction, and if it is on both sides in the width direction, the absorbent body is folded so as to straddle the embossments on both sides in the width direction.

A vertical interval between the embosses may be small at the center in the width direction of the absorber, and may gradually increase from a portion away from the center in the width direction of the absorber.
Since the embossing interval is small at the center of the absorbent body in the width direction, the creases at small intervals are repeated, so that the amount of bulging is smaller in the urination direction of the front body accompanying the deformation of the absorber.

The embossing can include a portion formed with a convex curve toward the crotch of the absorbent body.
With such an embossed shape, the resistance when the wearer pulls down the front body of the pants-type disposable diaper becomes small.

  As described above, according to the present invention, when the wearer pulls down the front body of the pants-type disposable diaper, it is possible to prevent excessive bulging forward due to the deformation of the absorbent body.

It is a plane schematic diagram (inner surface side) of the underpants type disposable diaper of a deployment state. It is a plane schematic diagram of an absorber and (a)-(h) is a schematic diagram showing an example of emboss formation. 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 model perspective view when the front body is pulled down in the wearing state of the conventional pants type disposable diaper. It is a model perspective view when the front body is pulled down in the wearing state of the pants-type disposable diaper of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of a pants-type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an outer body 20 that integrally constitutes a front body F and a rear body B, and an inner surface of the outer body 20 so as to extend from the front body F to the rear body B. The interior body 10 has a fixed interior body 10 in which an absorber 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable back side sheet 12. For example, during 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, the interior body 10 and the exterior body 20 are connected to the front body F and the rear body. Folded at the center in the front-rear direction (vertical direction), which is the boundary of the 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, thereby opening the waist opening and the left and right The pants-type disposable diaper is formed with a pair of leg openings.

(Structural example of interior body)
As shown in FIGS. 3 to 5, 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 excreted liquid that has passed through the top sheet 11 is absorbed and held. Although the planar shape of the interior body 10 is not particularly limited, it is generally a substantially rectangular shape as illustrated.

  As the top 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 top sheet 11, urine and the like are quickly absorbed, and the dry touch properties are excellent. The top sheet 11 is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 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 overall 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, but may have an appropriate shape such as a rectangular shape. 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. 4 and 5, the three-dimensional gather BS includes a fixed portion fixed to a side portion of the back surface of the interior body, and a side portion of the surface of the interior body from the fixed portion through the side of the interior body. The body part that extends to the front, the front and rear end parts of the body part in a lying state, the lying part fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part unfixed The part is formed by a three-dimensional gathered sheet 15 which is a double sheet by folding. As the three-dimensional gather sheet 15, a non-woven fabric having water repellency is preferably used.

  In addition, an elongated three-dimensional gathered elastic member 16 is disposed between the sheets of the double sheet at the tip of the free part. As shown by a two-dot chain line in FIG. 3 in the product state, the three-dimensional gather elastic member 16 is for forming a three-dimensional gather BS by standing up a free portion protruding from the absorber side edge portion by an elastic stretching force.

  The liquid-impermeable back side sheet 12 is folded back to the back side on both sides in the width direction of the absorbent body 13 together with the top sheet 11. 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. Further, 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 10.0 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 top sheet 11, the material fibers constituting the three-dimensional gather sheet 15 are olefin-based, such as polyethylene or polypropylene, polyester-based, amide-based synthetic fibers, regenerated fibers such as rayon and cupra, and cotton. Natural fibers can be used, and nonwoven fabrics obtained by appropriate processing methods such as the spunbond method, thermal bond method, melt blown method, and needle punch method can be used. It is preferable to use a non-woven fabric with excellent air permeability. Furthermore, with respect to the three-dimensional gather sheet 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), a silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

(External body structure example)
The exterior body 20 has a part constituting the front body F extending from the center in the front-rear direction to the ventral side and a part constituting the back body B extending from the center in the front-rear direction to the back side. The side seal part 21 is formed by joining both side parts of the back and the back body B, and a waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs are formed. It is what.

  The exterior body 20 includes a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening to the upper end of the leg opening) having the side seal portion 21, and a longitudinal range (front body F) of a portion forming the leg opening. Leg opening L defined between the vertical region having the side seal part 21 and the vertical region having the side seal part 21 of the back body B. The waistline portion T can be divided into a waist portion W that conceptually forms an edge of the waist opening and a waist lower portion U that is a lower portion than the waist portion W. From the absorber 13 or the interior body 10 The waist opening side is the waist portion W.

  As shown in FIGS. 3 to 5, the exterior body 20 has a two-layer structure including a pressing sheet 20 </ b> A and a back sheet 20 </ b> B each made of a nonwoven fabric, and the like, between the pressing sheet 20 </ b> A and the back sheet 20 </ b> B, and the back Various elastic members are disposed between the nonwoven fabrics of the folded portion 20C formed by folding the sheet 20B to the inner surface side at the waist opening edge, and elasticity is imparted. The planar shape has a pseudo hourglass shape as a whole by the concave leg surrounding lines 29 formed to form leg openings on both sides of the middle.

  In the front body F and the back body B, the exterior body 20 in the illustrated form includes a waist elastic member 24 disposed in the waist W as an elastic member along the width direction, and a waist lower part disposed in the waist lower part U. In addition to the leg elastic member 25 and the leg opening elastic member 27 disposed in the leg opening L, separately from these, the side seal part 21 extends while curving in a pattern toward the crotch portion along the monopod opening. The existing elastic members 26 and 28 are provided. These elastic members 24 to 28 are fixed in a state of being stretched at a predetermined stretch rate along their extending directions.

(Front / rear presser sheet)
As shown in FIGS. 1 and 3, in order to cover the front and rear end portions of the interior body 10 attached 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 and 60 may be 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 part 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 part), not only the adhesive does not stick out, but this part is also removed from the top sheet. It can be lifted slightly to function as a leak-proof wall.

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

(Example of emboss formation in absorber 13)
Now, the present invention is characterized in that at least one groove-like embossment along the width direction is formed in the absorbent body on each of the skin side and the clothing side of the front body part.
An example of this emboss formation is shown in FIG. A solid line indicates the emboss 17a on the clothing side, and a broken line indicates the emboss 17b on the skin side.

  In the example of FIG. 2A, the garment-side emboss 17a and the skin-side emboss 17b are each formed with a uniform convex curve that bulges in the crotch side, and the vertical interval is formed substantially the same in the width direction. .

  In the example of FIG. 2B, the garment-side emboss 17a and the skin-side emboss 17b are each formed with a convex curve that swells to the crotch side, but the vertical interval is not uniform in the width direction. That is, since the curvature of the emboss curve is smaller toward the end in the longitudinal direction of the absorber 13, the emboss interval in the longitudinal direction is smaller at the center in the width direction, and the interval is larger toward the outside in the width direction.

  In the example of FIG. 2C, the garment-side emboss 17a and the skin-side emboss 17b are formed with convex curves that swell toward the crotch side, but the vertical interval is not uniform in the width direction. That is, since the curvature of the emboss curve is larger toward the longitudinal direction end side of the absorbent body 13, the emboss interval in the vertical direction is larger at the center in the width direction, and the interval is smaller toward the outer side in the width direction.

  In the example of FIG. 2D, the garment-side emboss 17a and the skin-side emboss 17b are each formed with a uniform convex folding curve that swells to the crotch side by a combination of diagonal lines and horizontal lines, and the vertical spacing is They are formed substantially the same in the width direction.

  In the example of FIG. 2 (e), the garment-side emboss 17a and the skin-side emboss 17b are each formed with a uniform composite line that swells to the crotch side by a combination of a horizontal line and a curve, and the vertical interval is the width direction. Are substantially the same.

  In the example of FIG. 2 (f), the garment-side emboss 17a and the skin-side emboss 17b are not formed in the middle of the absorbent body in the width direction, but are formed only on both sides in the width direction.

  In the example of FIG. 2 (g), the garment-side emboss 17a and the skin-side emboss 17b are not formed in the middle of the absorbent body in the width direction, but are formed only on both sides in the width direction. This is an example in which the vertical positions of the side embossing 17a and the skin side embossing 17b are different.

In the example of FIG. 2 (h), an example in which the clothing side embossing 17a and the skin side embossing 17b are intermittently formed in the length direction is shown as an example according to the example of FIG. 2 (a). .
This intermittent embossing example can also be applied to the other examples shown in FIGS.

  The groove width of each emboss 17 is preferably 1 mm to 3.5 mm, and when it is 1 mm or less, the crease tends to be difficult to be formed. In the case of 3.5 mm or more, the bending stress is dispersed and is not easily folded.

  When the embossers 17a and 17b are worn on the body and the wearer is standing and pulls down the front body F downward, the absorbent body 13 is folded in a bellows shape with the embosses 17a and 17b as a boundary. For this purpose, the vertical embossing interval is preferably in the range of 10 mm to 25 mm. If the embossing interval is less than 10 mm, the interval may be too narrow to be folded at the embossed part. Moreover, when it exceeds 25 mm, since an embossing space | interval is too wide, it may bend | fold at parts other than an embossed part and may bulge excessively ahead.

  The formation region and arrangement of the embossed 17 group in the front body F are preferably between the positions separated from the front end position of the absorber 13 by 10 cm on the crotch. If the embossing is formed over an excessively wide range, the diffusibility of urine is impaired, and the wearing feeling of the user is deteriorated.

(Example)
The disposable diaper of the conventional example and the disposable diaper of the present invention example were respectively attached to the human body model, and the shape of the front body part of the diaper when the center of the front body was lowered was observed.
Each result is schematically shown in FIGS. In the conventional pants-type disposable diaper in which the dotted line indicates the folded valley fold portion and the dashed-dotted line indicates the mountain folded portion, the fold is messy and the position is not fixed, and the large bulge amount Xp is generated in the present invention. In such a pants-type disposable diaper, a regular bellows-like bent is generated, and it can be seen that the bulging amount Xi of the pants-type disposable diaper according to the present invention in FIG. 8 is remarkably small.

(Other)
It is only necessary to continuously cover the front body F to the back body (not shown) with an integral exterior body, and the exterior body is divided into those constituting the front body F and those constituting the back body, The outer body of the front body F and the outer body of the rear body are not continuous on the crotch side, and may be employed in a separated form (not shown). In this case, the outer body of the front body has at least a portion overlapping with the emboss, a portion on both sides in the width direction, and a portion on the waist opening side, that is, the outer body is an emboss connected to the emboss of the absorber. In this way, when the emboss is formed on the outer package and the emboss is connected to the emboss disposed on the absorber, the fold generated from the outer package also propagates to the absorber. Some have a synergistic effect. Moreover, the back surface of the interior body can be covered with a crotch outer body such as a nonwoven fabric.
When embossing is performed on the garment side of the absorbent body 13, a hot melt adhesive may be applied to the exterior body 20 in addition to the embossed portion, and the hot melt adhesive may be applied only in the embossed portion. And may be bonded to the exterior body 20.
The hot melt adhesive may be applied only to the embossing that is valley-folded (extruding to the skin side) and bonded to the exterior body 20, or only to the embossing that is mountain-folding (extruding to the clothing side). May be applied and bonded to the exterior body 20.
About application | coating of these hot-melt-adhesives, when applying embossing from the exterior body exterior, it is applicable similarly.

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

  B ... Rear body, BS ... Solid gather, F ... Front body, 10 ... Interior body, 11 ... Top sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 13N ... Constricted part, 14 ... Packaging sheet, DESCRIPTION OF SYMBOLS 15 ... Three-dimensional gather sheet | seat, 16 ... Three-dimensional gather elastic member, 17 ... Embossing, 17a ... Clothes side embossing, 17b ... Skin side embossing, 20 ... Exterior body, 20C ... Folding part, 21 ... Side seal part, 24 ... Waist part elasticity 25, waist lower part elastic member, 26, 28 ... elastic member, 29 ... leg circumference line, T ... waist circumference part, L ... leg opening, W ... waist part, U ... waist lower part.

Claims (6)

The front body and the back body are individually or integrally configured exterior body, provided inside the exterior body so as to extend from the front body to the back body, and a top sheet that covers the absorber from the skin side,
A pants-type disposable diaper having a waist opening and a pair of left and right leg openings formed by joining side edges of the outer body of the front body and both side edges of the outer body of the rear body to form a side seal part In
A pants-type disposable diaper characterized in that at least one groove-shaped emboss is formed in the absorbent body on the skin side and the clothing side of the front body part along the width direction. The pants-type disposable diaper according to claim 1, wherein the emboss is alternately formed on the skin side and the clothing side. The pants-type disposable diaper according to claim 1, wherein one end of the embossing does not reach the side surface in the width direction of the absorber. The pants-type disposable diaper according to claim 1, wherein the emboss is not formed in the middle of the absorbent body in the width direction. The underpants type disposable diaper according to claim 1, wherein a vertical interval between the embossments is small at a center in the width direction of the absorbent body and gradually increases from a portion away from the center in the width direction of the absorber. The pants-type disposable diaper according to claim 1, wherein the emboss includes a portion formed with a convex curve toward the crotch of the absorber.

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