JP4644588B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood, cages, and the like, and more particularly, to an absorbent article having a three-dimensional gather having a high side leakage prevention effect.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable top sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

Numerous improvements have been made on this type of absorbent article, and various means for preventing leakage of body fluids have been taken. As one of these body fluid leakage prevention means, there is one provided with a three-dimensional gather for preventing side leakage on both sides on the surface side. For example, in the following patent document 1 and the following patent document 2, the gather sheet has a first free part that goes to the outside in the width direction, and a second free part that is folded between the front end of the free part and goes to the inside in the width direction. Is disclosed.
JP 2001-95844 A JP 2004-24310 A

  However, in the case of the three-dimensional gather structure that rises in a cross-sectional shape, the standing part (free part) falls inward when mounted, as shown in FIG. In such a state, the napkin surface may be covered and the effective absorption width may become extremely narrow. In this state, if menstrual blood or the like is discharged to the upper surface of the three-dimensional gather, it may leak along the upper surface side of the gather as it is.

  On the other hand, according to a monitor survey, some users dislike that menstrual blood adheres to the underwear of shorts, and it has been found that there are many cases in which a three-dimensional gather is installed in an outwardly expanded state.

  Therefore, the main problem of the present invention is to provide a three-dimensional gather having a first free part that extends from the surface to the outside in the width direction or rises, and a second free part that continues from the first free part to the inside in the width direction. In the absorbent article, by making the three-dimensional gather easy to face outward, it is possible to prevent the free part from falling inward and reliably prevent side leakage such as menstrual blood.

As the present invention according to claim 1 for solving the above-mentioned problem, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the both sides of the surface side are respectively from the surface. The first free portion and / or the second free portion has a cross-sectional shape having a first free portion that faces or rises outward in the width direction and a second free portion that continues from the first free portion toward the inner side in the width direction. A three-dimensional gather in which one or a plurality of elastic elastic members are disposed along the longitudinal direction of the absorbent article is formed in the free part, and the three-dimensional gather is the first free part and the second free part in the longitudinal front and rear parts, respectively. In the absorbent article in which the part is bonded to the predetermined inner side position from the front and rear ends, and the first free part is bonded to the surface side from the front and rear ends to the predetermined inner side position,
Adhesion between the first free portion and the second free portion in the longitudinal front and rear portions of the absorbent article is performed when the inner side position of the bonding portion is within the bonding width and the bonding end position of the inner portion is the bonding portion of the outer portion. Adhering to the front and rear end side positions of the absorbent article with respect to the end position,
The first free part is bonded to the surface side of the absorbent article at one or a plurality of positions in the middle part in addition to the adhesion in the longitudinal front and rear parts of the absorbent article , and the first free part The absorbent article is characterized in that the intermediate part is bonded only to the outer part in the width direction, and an elastic elastic member is disposed along the longitudinal direction of the absorbent article in the width direction middle of the first free part. Provided.

  In the first aspect of the present invention, the substantially cross-sectional shape having a first free portion that extends outward in the width direction, and a second free portion that is folded back in the shape of a character between the distal ends of the free portions and goes inward in the width direction. In the absorbent article provided with a three-dimensional gather, the bonding between the first free part and the second free part in the longitudinal front-rear part of the absorbent article is the inner side position of the bonded part within the bonding width. The first free part is bonded to the front and rear parts in the longitudinal direction of the absorbent article, and the middle part thereof is attached so that the closer part is closer to the front and rear ends of the absorbent article than the outer part. The first free portion is restricted from standing upright and the second free portion stands upright in a nearly vertical state. To come. Therefore, in the mounted state, the free part does not fall inward from the inner edge of the gathers and does not cover the absorber. Moreover, it becomes easy to fall down outside, and a side leak comes to be prevented because the inner surface side of a 2nd free part contacts skin and a surface.

Further, the bonding at the intermediate portion of the first free portion is performed only at the outer portion in the width direction, and an elastic elastic member is disposed along the longitudinal direction of the absorbent article in the middle of the width direction of the first free portion.

Therefore, since the elastic elastic member arranged along the longitudinal direction of the absorbent article in the middle of the width direction of the first free part acts to lift the upper surface of the first free part whose standing is restricted, In a state where the second free portion is mounted to fall outside, side leakage is prevented in order to bring the lifting portion of the first free portion into close contact with the skin.

As the present invention according to claim 2 , the elastic elastic member disposed along the longitudinal direction of the absorbent article in the first free part and / or the second free part is formed into a plurality of strips, the absorbent article of claim 1 Symbol placement stretching force has been set so as to gradually become smaller toward is provided.

In the invention according to claim 2 , the elastic stretchable member disposed in the three-dimensional gather is set so that the stretchable force gradually decreases as it goes to the distal end side of the free portion, thereby improving the fit of the suspension. At the same time, it becomes possible to prevent the outwardly gathered three-dimensional gather from returning to the inside.

As the present invention according to claim 3 , there is provided the absorbent article according to any one of claims 1 and 2 , further comprising a third free portion that is folded back to the opposite side, more continuously than the tip of the second free portion. The

As the present invention according to claim 4, wherein either the third applying Rubberized the inner surface of the free portion, the absorbent article according to claim 3, wherein you have stuck the slip material is provided.

In the invention of claim 4 above, when wearing shorts at the time of wearing, the base portion of the foot hits the anti-slip portion of the third free portion, and it becomes easy to wear while raising the standing gather portion outward.

  As described above in detail, according to the present invention, there is provided a three-dimensional gather having a first free part that extends from the surface toward the outside in the width direction or rises and a second free part that continues from the first free part toward the inside in the width direction. In the absorbent article provided, it is possible to prevent the free part from collapsing inward by making the three-dimensional gather easy to face outward, and to reliably prevent side leakage such as menstrual blood.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a development view of a sanitary napkin 1 according to a first embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG. is there.

The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a liquid-permeable top sheet 3 that allows permeation of menstrual blood, cages, and the like, and an intervening sheet between the sheets 2 and 3. Absorbent bodies 4 and 6 made of cotton-like pulp or synthetic pulp, etc., crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility, and the abbreviation of the absorbent body 4 Consists mainly of a pair of left and right three-dimensional gathers BS, BS provided with a side edge portion as a standing base end and projecting from the body fluid discharge portion H to the surface side in a predetermined section in the front-rear direction, and the absorption In the periphery of the body 4, the outer edge portions of the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are joined at the upper and lower end edges by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious backsheet 2 that extends to the side of the absorbent body 4 at both side edges and the side nonwoven fabric 7 that forms the three-dimensional gather BS are adhesives such as hot melt, Wing-like flaps W and W that are joined by an adhesive means such as heat seal and project laterally by the laminated sheet portion of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 are formed, and the heel portion is more than this. Second wing-shaped flaps W _B and W _B are formed on the portion located on the side.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impervious backsheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed on the non-use side (outer surface) of the liquid-impermeable back sheet 2 so as to fix the sanitary napkin 1 to the underwear when worn on the body. It has become.

  Next, the liquid-permeable top sheet 3 is preferably a porous or non-porous nonwoven fabric or a porous plastic sheet. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, 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 top sheet 3, menstrual blood, venom, etc. (hereinafter collectively referred to as body fluid) are quickly absorbed, and the dry touch property is excellent. It will be a thing.

  The absorbent body 4 is not particularly limited as long as it can absorb and retain bodily fluids. Usually, a fluffy pulp mixed with a water-absorbing polymer powder is preferably used from the viewpoint of the absorption function and cost. The absorbent body 4 is preferably surrounded by crepe paper 5 to maintain its shape.

  A middle-high absorber 6 is disposed along the longitudinal direction at the center on the upper surface side of the absorber 4. The thickness of the medium-high absorbent body 6 is preferably 3 to 20 mm, preferably 5 to 15 mm, because if the thickness is too large, the rigidity of the absorbent body increases and the adhesion to the body decreases.

On the other hand, the width dimension of the liquid-permeable top sheet 3 is slightly longer than the width of the absorbent body 4 and covers the absorbent body 4 as shown in the cross-sectional views of FIGS. The purpose of the three-dimensional gathered BS is to prevent the permeation of menstrual blood, or the like from the side non-woven fabric 7 different from the liquid-permeable top sheet 3, specifically to increase the feeling of touch. Depending on the case, it is configured using a non-woven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment. The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 18 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. to reliably prevent the passage of body fluids. A water repellent nonwoven fabric coated with is preferably used.

As shown in FIGS. 2 and 3, the side nonwoven fabric 7 has an outer portion from the intermediate portion in the width direction from the inner position of the absorbent body 4 to slightly beyond the absorbent side edge to the outer edge of the liquid-impermeable backsheet 2. Adhering with an adhesive such as hot melt over a range, the laminated sheet portion of the side nonwoven fabric 7 and the liquid-impermeable back sheet 2 makes a pair of left and right at the side of the absorbent body substantially corresponding to the body fluid discharge portion H. wing flaps W, to form a W, a second wing-shaped flaps W _B now to the buttocks side _position, to form a W _B. These wing-shaped flaps W, W and second wing-shaped flaps W _B, respectively adhesive layer 10 ... on the outer surface side of the W _B, equipped with a 11 ..., when worn for shorts, the wing-shaped flaps W, W are folded line It is folded back to the opposite side at the RL position and wrapped around the crotch portion of the shorts to be fastened.

(Three-dimensional gather structure)
An inner side portion of the side non-woven fabric 7 is folded substantially double, and an elastic elastic member 19 having both ends or an appropriate position in the longitudinal direction fixed to the middle portion in the height direction is disposed inside the double sheet. In addition, a plurality of, in the illustrated example, two elastic elastic members 20 and 20 are disposed on the upper portion of the elastic elastic member 19 in a state where both ends or appropriate positions in the longitudinal direction are fixed. . As shown in FIG. 3, the double sheet portion is bent and laminated on the absorbent body 4 side in a state of being folded and laminated in a Z-shaped cross section, thereby bending the elastic elastic member 19 placement site. As points, solid gathers BS and BS having a cross-sectional shape are formed.

Further, the solid gather BS will be described in detail with reference to FIG.
The three-dimensional gather BS has a cross-sectional shape having a first free portion 12 that extends outward in the width direction, and a second free portion 13 that is continuous from the first free portion 12 and is folded back in a square shape toward the inner side in the width direction. In the first free portion 12 and / or the second free portion 13, one or a plurality of elastic elastic members 19, 20 are arranged along the longitudinal direction of the napkin. In this example, an elastic expansion / contraction member 19 is disposed at a bent portion corresponding to the boundary between the first free portion 12 and the second free portion 13, and two elastic expansion / contraction members 20, 20 are disposed on the second free portion 13. It is installed.

  Further, as shown in FIG. 3, the first free portion 12 and the second free portion 13 are bonded from the front and rear ends of the napkin to a predetermined inward side position at the front and rear portions in the napkin longitudinal direction, respectively. 1 free part 12 is bonded from the front and rear ends of the napkin to a predetermined inward side position, and is bonded to the surface side of the napkin 1 in a laminated state. Cross-sectional solid gathers BS and BS are formed.

  The structure of the three-dimensional gather BS having the above structure is a gather structure that is often used particularly in night napkins. However, in the present invention, the three-dimensional gather BS is improved so that the standing part (free part) is in the mounted state. This prevents it from falling inside. That is, as shown in FIG. 4 (B), the three-dimensional gather BS is made easier to face outward, thereby preventing the free parts 12 and 13 from falling inward and ensuring side leakage such as menstrual blood. It is something to prevent.

Specifically, the bonding structure of the first free portion 12 and the second free portion 13 at the front and rear portions in the longitudinal direction of the napkin is shown in FIG. Make changes. In other words, among the adhesive width, by bonding end position P ₁ of the inboard portion 14A is bonded with a change such that the napkin front and rear end-side position than the adhesive end position P ₂ of the outboard portion 14B, the bonded portion The inner terminal line is inclined in an oblique direction in plan view, so that the second free portion 13 can easily stand up naturally.

  Further, as shown in FIG. 6, the bonding structure of the first free portion 12 to the napkin surface is bonded from the front and rear ends of the napkin to a predetermined inner side position (regions 15 and 16), and an intermediate portion thereof. In the illustrated example, it is bonded to the surface side at one or a plurality of locations, and in the illustrated example at one intermediate location (a reference numeral 17 region).

  As a result, as shown in FIG. 7, the three-dimensional gather BS is limited in standing of the first free portion 12 and the second free portion 13 stands upright in an almost vertical state. Therefore, in the mounted state, the free part does not fall inward from the inner edge of the gathers and does not cover the absorber 4. Moreover, it becomes easy to fall down outside, and a side leak comes to be prevented when the inner surface side of the 2nd free part 13 contacts skin and a surface. Furthermore, since the contact area with the skin increases even when it is tilted outward, it is possible to prevent menstrual blood from adhering to the underwear of the shorts.

[Other Embodiments]
(1) In the above-described embodiment, the elastic elastic members arranged in the three-dimensional gather BS are the intermediate folded portion and the upper portion thereof, but as shown in FIGS. 6 and 8, the middle of the first free portion 12 The adhesion at the portion may be the adhesion only at the outer portion in the width direction, and the elastic expansion / contraction member 18 may be disposed along the longitudinal direction of the napkin 1 in the middle of the first free portion 12 in the width direction. The elastic elastic member 18 acts so as to lift the upper surface of the first free part 12 whose standing is restricted, so that the first free part 13 is mounted with the second free part 13 tilted outward. Since the lifting portion of the free portion 12 is brought into close contact with the skin, side leakage can be prevented.

(2) As shown in FIG. 9, by setting the elastic elastic members arranged in the three-dimensional gather BS so that the elastic force gradually decreases toward the tip side of the free parts 12 and 13, The second free portion 13 that has turned outward can be prevented from returning to the inside.

(3) In the above embodiment, only the first free portion 12 portion is adhered to the napkin surface. However, as shown in FIG. 10, from the intermediate folding position (position where the elastic elastic member 19 is disposed). If the upper portion, that is, the range of the second free portion 13 is adhered to the napkin surface, the second free portion 13 can stand up in the natural state.

(4) As shown in FIG. 11, the three-dimensional gather BS may have a structure having a third free portion 21 that is further continuously folded from the tip of the second free portion 13 and folded back to the opposite side. In this case, the inner surface side 22 of the third free portion 21 may be anti-slip processed or an anti-slip material may be attached. As the anti-slip process, for example, the side nonwoven fabric 7 may be corrugated along the gather longitudinal direction, or a corrugated nonwoven fabric may be attached. When wearing shorts during wearing, the base portion of the foot hits the anti-slip portion of the third free portion 21, and it is easy to wear while raising the standing gather portion outward.

(5) In the above-described embodiment, the three-dimensional gather BS has the first free portion 12 that extends from the surface toward the outside in the width direction, and the second free portion 13 that continues from the first free portion 12 toward the inside in the width direction. Although the cross-sectional shape is shown, as shown in FIG. 12 (A), the first free portion 12 rising from the surface and the second free portion 13 continuously inward in the width direction from the first free portion 12 The present invention can also be applied to a three-dimensional gather BS having a cross-sectional shape. Further, as shown in FIG. 12 (B), the first free portion 12 rising from the surface and the second free portion 13 continuously inward in the width direction from the first free portion 12 are provided. The present invention can also be applied to a three-dimensional gather BS having a substantially T-shaped cross section having a third free portion 23 extending from the top of the free portion 12 to the opposite side of the second free portion 13.

It is an expanded view of the sanitary napkin 1 which concerns on the 1st form example of this invention. It is the cross-sectional view (II-II line arrow view of FIG. 1). It is the cross-sectional view (III-III arrow directional view of FIG. 1). It is a schematic diagram of the solid gather BS. It is a top view which shows the adhesion structure in the napkin longitudinal direction front-back part of the 1st free part 12 and the 2nd free part 13. FIG. It is a top view which shows the adhesion structure to the napkin surface of the 1st free part. It is a top view which shows the standing state of solid gather BS which concerns on this invention. It is a principal part cross-sectional view which shows the other form example (the 1) of solid gathers BS which concerns on this invention. It is a principal part cross-sectional view which shows the other form example (the 2) of solid gather BS which concerns on this invention. It is a principal part cross-sectional view which shows the other form example (the 3) of solid gathers BS which concerns on this invention. It is a principal part cross-sectional view which shows the other form example (the 4) of solid gather BS which concerns on this invention. It is a principal part cross-sectional view which shows the other form example (the 5) of solid gathers BS which concerns on this invention. It is a figure for demonstrating the problem of the conventional solid gather BS.

DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Middle high absorber, 7/8 ... Side nonwoven fabric, 20 ... Elastic expansion and contraction member, 9 ... groove or wrinkle, 12 ... first free portion, 13 ... second free portion, 21 ... third free portion, BS ... standing gathers, W ... wing-shaped flaps, W B _... buttocks side wing-shaped flaps

Claims (4)

An absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the first free part that rises outward from the surface in the width direction or rises on each side of the surface side, and the first It is set as the cross-sectional shape which has the 2nd free part which goes to the width direction inner side continuously from one free part, and is 1 or a plurality of strips along the longitudinal direction of an absorptive article in the 1st free part and / or the 2nd free part. A three-dimensional gather in which elastic elastic members are arranged is formed, and the three-dimensional gather is bonded to the front and rear ends of the three-dimensional gather from the front and rear ends to a predetermined inward position. In addition, in the absorbent article in which the first free part is bonded to the surface side from the front and rear ends to a predetermined inward side position,
Adhesion between the first free portion and the second free portion in the longitudinal front and rear portions of the absorbent article is performed when the inner side position of the bonding portion is within the bonding width and the bonding end position of the inner portion is the bonding portion of the outer portion. Adhering to the front and rear end side positions of the absorbent article with respect to the end position,
The first free part is bonded to the surface side of the absorbent article at one or a plurality of positions in the middle part in addition to the adhesion in the longitudinal front and rear parts of the absorbent article , and the first free part The absorbent article, wherein the intermediate portion is bonded only to the outer portion in the width direction, and an elastic elastic member is disposed along the longitudinal direction of the absorbent article in the width direction middle of the first free portion . A plurality of elastic elastic members are provided in the first free part and / or the second free part along the longitudinal direction of the absorbent article, and the elastic force gradually decreases toward the distal end side of the free part. the absorbent article of claim 1 Symbol placement is set as. The absorbent article according to any one of claims 1 to 2 , further comprising a third free portion that is folded back to the opposite side in a continuous manner from the tip of the second free portion. The absorbent article according to claim 3 , wherein an anti-slip process is applied to the inner surface side of the third free part, or an anti-slip material is adhered.

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