JP2006130140A - Shorts type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shorts type disposable diaper effectively preventing slipping-off of a belly-side upper edge part without excessively tightening a wearer. <P>SOLUTION: This shorts type disposable diaper is provided with a belly side part, a back side part, a crotch part positioned therebetween, a waist opening part and a pair of leg opening parts. A lengthwise elastic part E wherein the elasticity in the lengthwise direction of the diaper is formed higher than the elasticity in the width direction is provided at the central part in the width direction of the diaper in the belly side part; and a high friction part F having a higher friction coefficient than other parts in the inner side is provided near the edge part 22a of the waist opening part on the inner side of the belly side part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

Conventionally, as a disposable diaper, a pants-type diaper that can be worn in the same manner as an underwear pant is known.
In a pants-type diaper, the degree of tightening cannot be adjusted using a fastening tape like a so-called unfolded diaper, so an elastic member is arranged at the waist opening or slightly below it to improve the fit to the wearer. Yes.
However, in a conventional diaper, the diaper may slide down due to the activities of the wearer. As a countermeasure, it is conceivable to increase the tightening force of the waist opening, but it is not preferable to tighten the wearer too strongly.

  Patent Document 1 proposes a diaper in which a holding band having a high static friction coefficient is provided on the body-facing inner surface of a waistband disposed around the waist. Patent Document 2 discloses a disposable underwear having an outer cover and an absorbing means disposed in the outer cover, wherein the outer cover is elastically stretchable, and the outer cover and the absorber are provided with each other. What is fixed in a particular manner is described.

JP 2002-543926 A Japanese Patent Laid-Open No. 62-162002

In the diaper of Patent Document 1, it seems that it is possible to prevent the entire diaper from slipping down greatly, but when the wearer performs an activity such as bending or stretching the waist, Edge slipping cannot be prevented.
Regarding the disposable underwear of Patent Document 2, it seems that the fit is improved, but the above-described slipping of the upper edge of the ventral part cannot be prevented.

  Therefore, the objective of this invention is providing the underpants type disposable diaper which can prevent the slipping of the upper edge part of a stomach side part effectively without tightening a wearer excessively.

  The present invention is a pants-type disposable diaper having a ventral side portion, a dorsal side portion and a crotch portion positioned therebetween, having a waist opening portion and a pair of leg opening portions, and a central portion in the diaper width direction in the ventral side portion The diaper longitudinal stretchability is higher than the diaper width stretchability, and the inner surface of the abdomen side portion is located near the edge of the waist opening. The said objective is achieved by providing the underpants type disposable diaper in which the high friction part whose friction coefficient is higher than the other site | part in the side is provided.

  According to the disposable diaper of the present invention, it is possible to effectively prevent the upper edge portion of the ventral side portion from slipping without excessively tightening the wearer.

The present invention will be described below based on preferred embodiments with reference to the drawings.
A pants-type disposable diaper 1 (hereinafter referred to as diaper 1) as an embodiment of the present invention is a diaper for infants, and includes a waist opening 22 and a pair of leg openings 23, 23 as shown in FIG. It has a pants-type form.
As shown in FIG. 3, the diaper 1 is a liquid-permeable top sheet 2, a liquid-impermeable (including non-permeable) back sheet 3, and a liquid-retaining absorption interposed between both sheets 2 and 3. The absorbent main body 5 having the absorbent core 4 and the exterior body 10 that is positioned outside the absorbent main body 5 (on the non-skin contact surface side) and that fixes the absorbent main body 5 to each other.
As shown in FIGS. 1 and 2, the diaper 1 is disposed between an abdominal side A disposed on the wearer's ventral side and a back side B disposed on the dorsal side of the wearer when worn. And crotch part C. The crotch part C has a recessed portion for forming a leg opening on both the left and right sides. As shown in FIG. 1, the exterior body 10 has both side edges of the portion forming the back side A and both side edges of the portion forming the ventral side B joined together by a known joining means. Thus, a pair of side seal portions 21 and the above-described openings 22, 23, 23 are formed.

As shown in FIG. 2, the absorbent main body 5 has a vertically long rectangular shape, the longitudinal direction of which is aligned with the longitudinal direction of the expanded and expanded diaper (see FIG. 2). The diaper is joined to the center in the width direction (same as the center in the width direction of the outer package 10).
The absorbent core 4 has a shape (hourglass shape) in which the central portion in the longitudinal direction is constricted, and is sandwiched and fixed between the top sheet 2 and the back sheet 3. The absorbent core 4 is made of a fiber assembly mainly composed of hydrophilic fibers such as pulp fibers, and is covered with a water-permeable covering sheet (not shown) made of tissue paper, water-permeable nonwoven fabric, etc. (not shown). . The absorbent core 4 can also contain a water-absorbing polymer.

As shown in FIGS. 1 and 3, the exterior body 10 includes two sheets 11 and 12 and elastic members 13, 14, 15, and 16 that are fixed between the two sheets. Specifically, between the two sheets 11 and 12, a waist elastic member 13, a leg elastic member 14, a waistline elastic member 15, and an elastic member 16 for forming a vertical stretchable part are fixed in an extended state. ing.
The waist part elastic member 13 is distribute | arranged along the opening periphery at the peripheral part of the waist opening part 22, and forms the waist gathers. The leg elastic member 14 is arranged on the peripheral edge of the leg opening 23 along the peripheral edge of the opening to form a leg gather. The waistline elastic member 15 is substantially parallel to the waistline direction in the waistline D which is a region from a position 30 mm below the waist periphery of the waist opening 22 to a height position of the upper ends of the leg openings 23 and 23. It is arranged to form a waistline gather. The waistline elastic member 15 is divided and disposed on the left and right sides of the abdominal side A. In each of the left and right waistline elastic members 15, the end of the diaper width direction central portion is located slightly inside the position of the side edge of the absorbent core 4. The left and right waistline elastic members 15 exhibit elastic stretchability outward in the diaper width direction from the side edges of the absorbent core 4, but are not present in the center in the width direction of the absorbent core 4. The waistline elastic member 15 can be arranged over the entire circumference of the waistline portion instead of being divided and disposed on the left and right sides of the abdominal side A.

  The present diaper 1 has a vertical stretchable part E at the central part in the diaper width direction in the ventral side part A. The vertical stretchable part E is a part in which the stretchability in the diaper longitudinal direction is higher than the stretchability in the diaper width direction, and may or may not have the stretchability in the diaper width direction.

Whether or not the stretchability in the diaper longitudinal direction is higher than the stretchability in the diaper width direction can be determined, for example, by comparing the stretch rate measured by the following method.
[Measurement of elongation ratio]
Except for cutting a 30 mm wide and 30 mm long sample from the uppermost part of the longitudinal stretchable part E and measuring the stretch rate at the time of loading at a grip interval of 20 mm and a load of 300 cN, 8.14 of the JIS L 1096 general fabric test method. .1 Measure the stretch ratio in the vertical and horizontal directions by the A method of stretch ratio (constant speed stretch method). The expansion ratio is obtained by the following formula (1).
Elongation rate [%] = (L-20) / 20 × 100 (1)
(However, in the formula, L: sample grip interval length [mm] when load is 300 cN.)

The longitudinal stretchable part E preferably has a diaper longitudinal stretch ratio value a determined by the above-described method larger than the diaper width stretch ratio value b determined by the above-described method. It is preferably 1.5 to 10 times larger than the value b.
The value a is preferably 10 to 400%, particularly preferably 50 to 300%.

As shown in FIGS. 1 to 3, the vertical stretchable part E in the diaper 1 is formed by fixing the elastic member 16 in an expanded state between the sheets 11 and 12 in the central part in the width direction of the exterior body 10. Yes.
A plurality of elastic members 16 are formed in a thread shape and are arranged at intervals of about 1 to 50 mm in the circumferential direction of the waistline portion D. Each elastic member 16 is arranged substantially parallel to the diaper longitudinal direction (in the developed and extended diaper, the diaper longitudinal direction). Although four elastic members 16 are shown in FIG. 1, the number of elastic members 16 can be, for example, about 2 to 100, and preferably about 3 to 20.

The vertical stretchable part E can also be formed by using a stretchable material whose stretchability in the diaper longitudinal direction is higher than the stretchability in the diaper width direction as a constituent material of the exterior body 10. As such a stretchable material, a stretchable nonwoven fabric containing an elastomer fiber as a constituent fiber, a stretchable film, a stretchable composite sheet composed of a stretchable nonwoven fabric and a stretchable film, or the like can be used. A stretchable nonwoven fabric is preferable from the viewpoint of securing the properties.
Examples of the elastomer fibers include styrene elastomer fibers, polyamide elastomer fibers, polyurethane elastomer fibers, and polyolefin elastomer fibers.
The stretchable nonwoven fabric may have a multilayer structure, and from the viewpoint of touch, a nonwoven fabric made of olefinic fibers is laminated on the portion of the stretchable nonwoven fabric that contains elastomer fibers as constituent fibers and abuts against the skin. Is preferred.

  The vertical stretchable part E is preferably stretchable by at least 20 mm or more in the longitudinal direction of the diaper, particularly preferably 30-200 mm stretchable from the viewpoint of preventing slipping of the upper edge of the ventral side part.

  In the diaper 1, as shown in FIGS. 2 and 3, a high friction coefficient is higher in the vicinity of the edge 22 a of the waist opening 22 on the inner surface side of the abdominal side portion A than in other portions on the inner surface side. Part F is provided. In FIG. 2, the part with the dotted pattern is the high friction part F.

In the diaper 1, one sheet 12 constituting the outer package 10 is longer in the diaper longitudinal direction than the other sheet 11, and a portion of the one sheet 12 extending from the other sheet 11 is an edge of the waist opening. The part 22a is folded back to the skin contact surface side. The folded portion 12 a forms the inner surface of the diaper in the vicinity of the waist opening 22.
The high friction part F in the diaper 1 is formed by fixing a belt-like high friction sheet 17 on the skin contact surface side of the folded portion 12a by a known joining means (adhesive, heat seal, etc.). As a material for forming the high friction sheet 17, a nonwoven fabric using an elastomer fiber, an ultrafine fiber nonwoven fabric, a modified cross-section fiber nonwoven fabric, a film using an elastomer resin, or the like can be used.

The friction coefficient of the high friction part F and other parts can be measured in accordance with the JIS K 7125 plastic-film and sheet-friction coefficient test method except that the tensile speed is 300 mm / min.
The friction coefficient of the high friction part F is the time when the vertical stretchable part E is stretched by 20 mm in the diaper longitudinal direction (preferably when it is stretched by 30 mm) in the diaper wearing state from the viewpoint of preventing slipping of the upper edge of the abdominal side. It is preferable to produce a frictional resistance that does not substantially deviate from the wearer's skin.

  Specifically, the friction coefficient of the high friction part F is preferably 0.5 or more, more preferably 0.7 or more, as measured by the above-described method with respect to the acrylic plate.

The high friction part F in this diaper 1 is formed on the waist gathers formed in the peripheral part of the waist opening part, and covers the full width of the ventral | abdominal side part A. FIG.
The high friction part F is preferably formed at least in the central part of the diaper width direction from the viewpoint of preventing slipping of the upper edge part of the ventral part, and the length in the waist circumferential direction of the ventral part A is It is preferably 20 to 100%, particularly 50 to 100% of the full width of the ventral side A.
Moreover, it is preferable that the high friction part F is formed in the range to 30 mm below from the edge 22a of a waist opening part. The fact that the friction coefficient is higher than the other parts on the inner surface side only needs to be higher than at least the average friction coefficient in the waistline portion D described above.

As shown in FIGS. 2 and 3, the absorbent main body 5 in the present diaper 1 has a non-fixed portion 51 that is not joined to the exterior body 10 on the abdominal side in the longitudinal direction. The whole or a part of the part E overlaps with the non-fixed part 51.
The non-fixed portion 51 preferably has a distance L (see FIG. 3A) from the edge 22a of the waist opening to the lower end 52 of the non-fixed portion 51 of 50 to 200 mm, particularly 70 to 150 mm. Further, the non-fixed portion 51 has a distance L1 [see FIG. 3A] from the longitudinal edge 5a on the ventral side of the absorbent main body 5 to the lower end 52 (see FIG. 3A), particularly 50 to 100 mm. It is preferable.

  The length of the absorbent core or the absorbent main body 5 is such that 50-100%, particularly 80-100% of the length L2 in the longitudinal direction of the diaper overlaps with the non-fixed portion 51. This is preferable from the viewpoint of sufficiently securing the length of the vertical stretchable part E while securing the length. From the same viewpoint, the length (vertical overlap length in the diaper vertical direction) where the vertical stretchable part E and the non-fixed part 51 overlap is preferably 30 to 200 mm, particularly 50 to 100 mm.

  In the non-fixed portion 51 of the diaper 1, the width in the diaper width direction at the longitudinal end edge 5 a on the abdominal side of the absorbent main body 5 extends over the entire width of the absorbent main body 5. In FIG. 2, a region where the absorbent main body 5 and the exterior body 10 are joined is indicated by a hatched portion, and portions other than the hatched portion of the absorbent main body 5 are not joined to the exterior body 10.

  The diaper 1 of this embodiment can be worn in the same manner as a normal pants-type diaper. In the wearing state, as shown to Fig.4 (a), the high friction part F contact | abuts to the skin surface of the umbilical part H vicinity in a wearer's abdominal part M. FIG. FIG. 4A shows a state where the wearer is bending the waist while sitting on the floor, a chair, etc. or bending over. And, when the wearer stretches his / her waist from that state, the skin of the wearer's abdominal part M greatly expands in the vertical direction, but the shift between the high friction part F and the wearer's skin surface is less likely to occur As shown in FIG. 4 (b), the vertical stretchable part E follows the skin extension, and as shown in FIG. 4 (b), the abdominal side upper edge (the upper edge of the waist opening) There is no deviation from the initial contact position. And when a wearer bends a waist again, the vertical expansion-contraction part E follows the contraction of skin, and as shown in FIG.4 (c), the state of a diaper is the same state as before extending a waist. Become. As described above, the change from the bent state to the extended state has been described as an example. However, the same applies when the waist is bent and the state is changed from the depressed state to the inflated state.

  FIGS. 4D to 4E are diagrams corresponding to FIGS. 4A to 4C, and illustrate a case of a conventional diaper. In the case of lacking the high friction part F, the case of lacking the longitudinal expansion / contraction part E, and the case of lacking both, the position of the upper edge part of the ventral part is shifted from the initial contact position in the stage of FIG. As a result, as shown in FIG. 4E, the upper edge of the ventral side part is displaced.

  In the present diaper 1, as shown in FIGS. 2 and 3, the folded portion 12a of the sheet 12 described above (the sheet disposed so as to cross the absorbent main body) is provided on the side of the abdominal side of the absorbent main body 5. The skin contact surface side of the end portion in the longitudinal direction is covered, and the folded portion 12a is formed on the left and right outer sides in the width direction of the absorbent main body 5 as shown in FIG. Or, it is joined to the exterior body 10 by a known joining means such as heat or ultrasonic seal, while it is not joined on the skin contact surface of the absorbent main body 5 as shown in FIG. . Thereby, even if it is a case where the stretchability of the diaper longitudinal direction is not used or is low as the material for forming the folded portion 12a, it is possible to prevent the stretchability of the longitudinal stretchable portion E from being hindered, and to absorb It is possible to prevent the main body 5 from significantly rising from the exterior body 10.

As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, the non-fixed portion 51 of the absorbent main body 5 may be formed in a form as shown in FIGS. In FIG. 5, a portion with a lattice pattern is a portion where the absorbent main body 5 and the exterior body 10 are joined, and the other portions are not joined. Even if it joins in such a mode, it can prevent that the elasticity of a vertical expansion-contraction part is inhibited by the rigidity of absorptive main part 5. FIG.

Further, the inhibition of expansion / contraction of the vertical expansion / contraction portion of the exterior body 10 due to the folded portion 12a of the sheet 12 (the sheet arranged so as to cross the absorbent main body) is also prevented by the configuration shown in FIG. 6 or FIG. be able to. In the embodiment shown in FIG. 6, the length of the folded portion 12a is variable by folding the folded portion 12a in a trifold shape to form the folded portion 12b. In the embodiment shown in FIG. 7, the exterior body 10 is made of a material that expands and contracts in the diaper longitudinal direction, and the folded portion 12 a has elasticity in the diaper longitudinal direction. In this case, the area | region between this can be functioned as a vertical expansion-contraction part by taking the distance between the upper edge part 22a of the waist opening part 7 and the edge part 5a of the absorptive main body 5 wide.
Moreover, the sheet | seat arrange | positioned so that an absorptive main body may be crossed may replace with the folding | turning part 12a of the sheet | seat 12, and may arrange | position a separate sheet | seat from it.

  In FIG. 3, the elastic member 16 may be eliminated, and longitudinally stretchable sheets using stretchable nonwoven fabric may be used as the sheets 11 and 12. In this case, there is no need to newly add a vertical elastic member, and there is an advantage that the configuration can be simplified.

  Further, the outer package 10 is not limited to two sheets laminated and bonded, and may be one sheet or three or more sheets laminated. Further, the back sheet of the absorbent main body 5 may be liquid permeable instead of liquid impermeable. The disposable diaper of the present invention may be an adult diaper.

FIG. 1 is a perspective view showing a state in which an embodiment of a pants-type disposable diaper of the present invention is viewed from the abdominal side. FIG. 2 is a plan view showing an extended and unfolded state of the diaper shown in FIG. 3A is a cross-sectional view taken along the line II-II in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a diagram for explaining the function and effect of the present invention. FIGS. 4A to 4C show the case of the present invention, and FIGS. 4D to 4F show the case of a conventional diaper. FIG. 5A to 5C are diagrams showing other embodiments of the present invention, respectively. FIG. 6 is a view showing still another embodiment of the present invention. FIG. 6 (a) is a view of the abdominal side of the diaper viewed from the inner surface of the diaper, and FIG. 6 (b) is a view of FIG. IV-IV line cross section. FIG. 7 is a diagram showing still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 4 Absorbent core 5 Absorbent main body 10 Exterior body A Back side part B Abdomen side part C Crotch part E Vertical stretchable part F High friction part

Claims (4)

A pants-type disposable diaper having a ventral side portion, a back side portion and a crotch portion located between the waist portion and a pair of leg openings,
A waist opening on the inner surface side of the abdominal side portion, having a longitudinally stretchable portion in which the stretchability in the diaper longitudinal direction is higher than the stretchability in the diaper width direction at the center portion in the diaper width direction in the ventral side portion A pants-type disposable diaper in which a high friction part having a higher friction coefficient than other parts on the inner surface side is provided in the vicinity of the edge of the part.   An absorbent body having an absorbent core, and an exterior body that is positioned on the non-skin contact surface side of the absorbent body and that fixes the absorbent body, and the longitudinally stretchable portion includes the exterior body The underpants-type disposable diaper according to claim 1, wherein   The absorptive main body has a non-fixed portion that is not joined to the exterior body on the side of the ventral side in the longitudinal direction, and the whole or a part of the vertical stretchable portion overlaps the non-fixed portion. The underpants type disposable diaper of Claim 2 which exists. The skin contact surface side of the longitudinal end of the abdominal side of the absorbent main body is covered with a sheet disposed so as to cross the absorbent main body, and the sheet has a width of the absorbent main body. The pants-type disposable diaper according to claim 2 or 3, wherein the pants-type disposable diaper is joined to the outer body on both the left and right sides of the direction, but not joined to the skin contact surface of the absorbent main body.