JP3844637B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads.
[0002]
[Prior art and problems to be solved by the invention]
As a prior art related to a technique for suppressing the onset of skin trouble by reducing moisture permeation during wearing and reducing moisture sensation during wearing while suppressing moisture onset of skin by absorbing moisture leakage sheets of absorbent articles, for example, A technique disclosed in Japanese Patent Laid-Open No. 10-508521 is known. In this technique, a sanitary napkin having a flap portion is composed of a leak-proof sheet that is porous and breathable including the flap portion.
However, the sanitary napkin having the flap portion is used by folding the flap portion to the outer surface of the crotch portion of the wearing shorts and fixing it with an adhesive for preventing slippage at the time of use. Since a leak-proof sheet that is porous and does not provide sufficient tear strength is used for the flap part, when removing the sanitary napkin from the wearing shorts after use, the flap part may break or a part of the flap part may In some cases, it may interfere with removal after use, such as remaining on the surface of the wearing shorts together with the adhesive for preventing misalignment. Depending on the wearer, the flap part may be removed while being folded and fixed. In this case, the above-described troubles are particularly likely to occur.
[0003]
Therefore, an object of this invention is to provide the absorbent article which can be removed after use without trouble.
[0004]
[Means for Solving the Problems]
The present invention includes a liquid-permeable surface sheet, a liquid-impermeable and breathable leak-proof sheet, and a liquid-retaining absorbent interposed between the two sheets, and a flap extending outward in the width direction. In the absorbent article in which a portion is formed and a non-skin-contacting adhesive is disposed on the non-skin contact surface side, at least a portion of the flap portion where the adhesive is disposed The flap portion is composed of a liquid-impermeable sheet that is separate from both the top sheet and the leak-proof sheet, and the top sheet or the leak-proof sheet . sheet is the extended to the outside of the side portions directly covering decoction width direction of the absorber, and provide an absorbent article, wherein the adhesive on the liquid-impermeable sheet is disposed This achieves the above object.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on preferred embodiments with reference to the drawings. 1 and 2 show an embodiment in which the absorbent article of the present invention is applied to a sanitary napkin (hereinafter also simply referred to as a napkin). Reference numeral 1 denotes a napkin.
[0006]
As shown in the figure, the napkin 1 has a substantially vertically long shape, a liquid-permeable top sheet 2, a liquid-impermeable and breathable leak-proof sheet 3, and an intervening sheet. The liquid-retaining absorbent 4 is provided. Further, the napkin 1 has a flap portion 6 extending outward in the width direction, which is formed of a top sheet 2 and a sheet (other sheet) 5, and the non-skin contact surface side of the flap portion 6, that is, The sheet 5 is provided with an adhesive 7 for preventing misalignment. That is, the napkin 1 does not have the leak-proof sheet 3 in the portion where the adhesive 7 is disposed in the flap portion 6.
[0007]
As shown in FIG. 2, the napkin 1 includes a sheet 5 in which an absorbent body 4 is disposed on a leak-proof sheet 3 and a flap portion 6 is formed on the skin contact surface side (upper side in the drawing) of the absorbent body 4. And the surface sheet 2 which forms the flap part 6 with the sheet | seat 5, and covers the skin contact surface side of the absorber 4 is arrange | positioned. In the present embodiment, the sheet 5 is disposed so as to cover the left and right side portions 4 a in the longitudinal direction of the absorber 4.
[0008]
The leak-proof sheet 3 has a substantially rectangular outer shape that is vertically long in plan view, and has a larger outer dimension than the absorber 4. The top sheet 2 forms a skin contact surface that is in contact with the wearer's skin when worn, and the outer shape thereof is substantially the same as the leak-proof sheet 3 except for the part that forms the flap portion 6. Shape. The sheet 5 has a portion that covers the side portion 4b on the skin contact surface side of the absorbent body 4 and a side portion 4a of the absorbent body 4, and a portion that forms the flap portion 6, and the outer shape thereof is the outer side. Has the same contour as the top sheet 2 and the inside has a straight contour along the longitudinal direction of the absorbent body 4. And the surface sheet 2 and the leak-proof sheet 3 are bonded by heat sealing at the peripheral portion so as to surround the absorber 4, and the portion forming the flap portion 6 in the surface sheet 2 and the sheet 5 is heat sealed at the outer edge portion. It is glued with. As a result, the peripheral portion of the napkin 1 has the surface sheet 2, the sheet 5, and the leak-proof sheet 3 bonded to each other on the left and right sides of the absorbent body 4 with the bonding portion 23, and The top sheet 2 and the leak-proof sheet 3 are bonded to each other at the portion 25, and other portions, that is, both end portions in the longitudinal direction of the napkin 1 (excluding the bonding portion 23) are bonded at the bonding portion 24.
[0009]
Further, an adhesive 8 for fixing the napkin 1 to the wearer's clothes is disposed on the lower surface of the leak-proof sheet 3, and the adhesive 8 is protected by a release sheet (not shown) when not in use. Has been. In the present embodiment, the leak-proof sheet 3 and the absorber 4 are partially bonded by an adhesive 9 disposed in a spiral shape on the leak-proof sheet 3.
[0010]
As shown in FIG. 1 and FIG. 2, an annular groove 20 that joins the topsheet 2 and the absorbent body 4 is formed in an approximately central portion of the topsheet 2 by embossing. The shape according to the induction | guidance | derivation of the liquid to the body 4 and a mounting state can be provided now. The annular groove 20 also has a function of preventing the liquid absorbed in the absorber 4 from diffusing around. Further, grooves 21 and 21 for joining the surface sheet 2, the sheet 5, and the absorber 4 are formed on both sides of the surface sheet 2 by embossing, and the absorbed liquid diffuses in the absorber 4. However, the spread of the liquid to both sides of the absorber 4 is suppressed by these grooves 21 and 21.
[0011]
Sheet 5, Ri liquid impermeable der, when removal of the napkin after use, or broken flap portion, from the viewpoint to prevent or leave an adhesive to the mounting portion, in accordance with JIS K7128 (B method) The measured tear strength is preferably 80 cN or more in the MD direction and 160 cN or more in the CD direction, more preferably 100 cN in the MD direction and 200 cN in the CD direction. From the same viewpoint, the maximum tensile strength of the sheet 5 is preferably 500 cN or more in the MD direction, 400 cN or more in the CD direction, more preferably 600 cN or more in the MD direction, and 500 cN or more in the CD direction. The maximum tensile strength is 100 ± 10 mm in the MD direction and 10 ± 1 mm in the CD direction when the measurement sample is in the MD direction, and 100 ± 10 mm in the CD direction and 10 ± 1 mm in the MD direction in the CD direction. And pulling at a chucking distance of 50 mm and a pulling speed of 300 mm / min, and measuring the maximum point. Here, in the absorbent article, the CD direction is preferably used in the width direction of the absorbent article.
As such a sheet material having a high tear strength, for example, a polyethylene film having a high tear strength such as a polyethylene film blended with an ethylene-α olefin copolymer obtained by polymerization with a metallocene catalyst, or a polyethylene (PE) fiber. And a laminated nonwoven fabric obtained by laminating a polyethylene film to a wet or dry nonwoven fabric made of polypropylene (PP) fiber, polyester fiber, polyethylene-polypropylene composite fiber, or polyethylene-polyester composite fiber.
[0012]
The leak-proof sheet 3 has air permeability, preferably water vapor permeability. As a result, when the napkin 1 is worn, an increase in humidity in the wearing is prevented, and a comfortable wearing feeling is obtained.
The degree of water vapor permeability of the leak-proof sheet 3 is determined by the moisture permeability measured in accordance with JIS Z0208 (hereinafter referred to as the moisture permeability measured by this method) from the viewpoint of preventing the increase of humidity in the wearing. , preferably 0.7g / (100cm ² · 24hr) or more, more preferably ^{1.0~5.0g / (100cm 2 · 24hr)} , particularly preferably 1.5~3.0g / (100cm ² · 24hr) It is.
[0013]
The leak-proof sheet 3 in the present embodiment is made of a hydrophobic film that is liquid-impermeable and breathable, and preferably has water vapor permeability. As a preferable example of such a film, a film is formed by melt-kneading a hydrophobic thermoplastic resin and a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer, etc. Or the porous film obtained by biaxial stretching is mentioned.
Moreover, as the leak-proof sheet 3, various sheets which are conventionally used for absorbent articles and are liquid-impermeable and breathable, preferably water vapor-permeable can be used. For example, polyethylene, polyester, Water-repellent nonwoven fabric made of polypropylene, polyethylene-polypropylene composite fiber, polyethylene-polyester composite fiber, etc., incompatible thermoplastic resins, specifically polyethylene, polyester, polypropylene, nylon, acrylic, etc. Water-repellent nonwoven fabric composed of split composite fibers, spunbonded nonwoven fabric, water-repellent multilayer composite nonwoven fabric composed of melt-blown nonwoven fabric, or a composite sheet of the above-mentioned sheet and the water-repellent nonwoven fabric, or the above-mentioned sheet and polyethylene, polyester, polypropylene, , Polyethylene-polypropylene Down composite fiber, polyethylene - composite sheets of a hydrophilic nonwoven fabric made of polyester bicomponent fibers, and the like.
[0014]
The width of the portion of the absorbent body 4 on the skin contact surface side where the sheets 5 and 5 are not present, that is, the width W1 between the edges 5a and 5a positioned on the skin contact surface side of the sheets 5 and 5 ( 2) is preferably 20 to 80 mm, particularly preferably 30 to 80 mm, from the viewpoint of securing a liquid absorption surface that absorbs the liquid in the napkin 1.
[0015]
As the surface sheet 2, the absorbent body 4, the pressure-sensitive adhesives 7 and 8, and the adhesive 9, those conventionally used for absorbent articles can be used without particular limitation.
[0016]
In the napkin 1 of this embodiment, like the conventional sanitary napkin provided with the flap portion, the leak-proof sheet 3 is first fixed to clothing such as shorts with the adhesive 8 and then the flap portion 6 is wrapped so as to wrap the clothing. And the flap portion 6 can be fixed to the clothes with the adhesive 7 and used. At this time, since the liquid-impermeable sheet 5 is bonded to both sides of the absorbent body 4 and the upper surfaces of both sides, when the flap portion 6 is wound around the shorts, both sides of the absorbent body 4 are both shorts crotch. It is securely fixed to the side. That is, it is possible to ensure a wider absorption surface even during wearing without both sides of the absorbent body 4 entering the inside of the shorts during wearing. For this reason, compared with what the flap part extends from the downward direction of the conventional absorber, a still higher leak-proof effect can be expressed.
[0017]
In the napkin 1 of the present embodiment, the non-skin contact surface of the flap portion 6 is formed of a sheet 5 having a predetermined tear strength, and the adhesive 7 is disposed on the sheet 5. The flap part 6 is not broken at the time of removal, and the adhesive 7 disposed on the flap part 6 does not remain on the clothes, so that the napkin 1 can be removed after use without any trouble. Moreover, since it is only necessary to dispose the expensive leak-proof sheet 3 only at a necessary location, it can be manufactured at a low cost. Furthermore, since the liquid-impermeable sheet 5 is disposed so as to cover both side portions of the absorber 4, even when the absorber 4 absorbs a large amount of liquid, the liquid held in the absorber 4 is not retained. No leakage from the side of the napkin 1.
[0018]
Further, in the napkin 1, since the leak-proof sheet 3 has air permeability, water vapor generated from the liquid absorbed by the absorber 4 is discharged out of the absorbent article, and the humidity inside the dressing increases. Is prevented. Thus, it is needless to say that a feeling of wetting and stuffiness can be eliminated and a comfortable wearing feeling can be obtained.
[0019]
The absorbent article of the present invention has no leak-proof sheet at least in the portion where the adhesive is disposed in the flap portion . For example, the sanitary napkin 1 ′ of another embodiment as shown in FIG. Is included . The basic configuration of the napkin 1 ′ shown in FIG. 5 is the same as that of the napkin 1 described above, and in the following description, a part different from the napkin 1 will be described in particular, and a part similar to the napkin 1 will be described. The same reference numerals are assigned and detailed description thereof is omitted. Therefore, the above description regarding the napkin 1 is appropriately applied to portions that are not particularly described.
[0020]
The napkin 1 ′ shown in FIG. 3 has a top sheet 2 ′ having the same external shape as the leak-proof sheet 3, a sheet 5 is disposed outside the top sheet 2 ′, and a flap portion 6. The configuration is the same as that of the napkin 1 except that 'is formed only from the sheet 5. And as a result of having such a structure, as for the peripheral part of napkin 1 ', sheet | seat 5, surface sheet 2', and leak-proof sheet | seat 3 are adhere | attached by adhesion part 23 'in the right-and-left both-sides edge part of the absorber 4. In other parts, that is, both end portions of the napkin 1 in the longitudinal direction (excluding the bonding portion 23 ′), the surface sheet 2 ′ and the leak-proof sheet 3 are bonded by the bonding portion 24. In addition, grooves 21 ′ and 21 ′ for joining the sheet 5, the surface sheet 2 ′, and the absorber 4 are formed on both sides of the surface sheet 2 ′ by embossing. In the present embodiment, the flap portion 6 ′ is preferably formed of a laminated nonwoven fabric obtained by laminating the nonwoven fabric and the polyethylene film in consideration of the touch.
[0021]
According to the napkin 1 ′ having the above configuration, the removal after use can be performed without any trouble as compared with the napkin 1 described above, and the napkin 1 ′ can be manufactured at a lower cost than the napkin 1. In addition, since the liquid-impermeable sheet 5 is disposed so as to cover both sides of the absorber 4, even when the absorber 4 absorbs a large amount of liquid, the liquid held in the absorber 4 is not retained. No leakage from the side of the napkin 1. Further, the napkin 1 ′ of the present embodiment, like the napkin 1, has a liquid-impervious sheet 5 bonded to both sides of the absorbent body and the upper surfaces of both sides. It can be ensured, and an even higher leak-proof effect can be achieved as compared with the conventional absorber in which the flap portion extends from below.
[0022]
The napkin 1 ′ shown in FIG. 4 is arranged such that the top sheet 2 ′ covers the side 4a of the absorbent body 4 so that the end 2a reaches the non-skin contact surface side of the absorbent body 4, and the flap 6 ′. Is formed only by the sheet 5 ′, and the surface sheet 2 ′, the sheet 5 ′, and the leak-proof sheet 3 are bonded by the bonding portion 23 on the non-skin contact surface side of the absorbent body 4.
In the napkin 1 ′ of the present embodiment, from the viewpoint of improving its leak-proof property and moisture permeability, the leak-proof sheet 5 ′, with respect to the width W2 (width of the absorber 4) between the left and right side ends of the napkin 1 ′. The width W3 of the portion where 5 ′ does not exist is preferably 20 to 90%, and more preferably 30 to 90%.
[0023]
According to the napkin 1 ′ having the above configuration, as with the above-described napkin 1, removal after use can be performed without any trouble as compared with the conventional napkin 1 and can be manufactured at a low cost.
[0024]
The napkin 1 ′ shown in FIG. 5 forms a flap portion 6 ′ with the leak-proof sheet 3 ′ and the sheet 5 having a window 30 for disposing an adhesive, and heat-seals the peripheral portion with an adhesive portion 25 ′. The adhesive 7 is disposed on the sheet 5 through the window 30.
[0025]
According to the napkin 1 ′ having the above-described configuration, the removal after use can be performed without any trouble as compared with the related art, and the napkin 1 ′ can be manufactured at a low cost. In addition, since the liquid-impermeable sheet 5 is disposed so as to cover both sides of the absorber 4, even when the absorber 4 absorbs a large amount of liquid, the liquid held in the absorber 4 is not retained. No leakage from the side of the napkin 1.
[0026]
The present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. The present invention includes a form without a leak-proof sheet in the portion where the adhesive for preventing slippage of the flap part is provided. For example, the flap part is a front part in the longitudinal direction of the absorbent article. Or what is formed in a back part and expands and fixes a flap part in clothes is also included. Also in such a case, the same effects of the present invention as in the above embodiment can be obtained.
[0027]
The present invention can be applied to disposable diapers, incontinence pads, panty liners and the like in addition to sanitary napkins as in the above embodiment.
[0028]
【The invention's effect】
The absorbent article of the present invention can be removed after use without hindrance. Moreover, since an expensive leak-proof sheet only needs to be provided at a necessary location, it can be manufactured at a low cost. Furthermore, since the liquid-impermeable sheet is disposed so as to directly cover both sides of the absorber, even when the absorber absorbs a large amount of liquid, the liquid held in the absorber is There will be no leakage.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as an embodiment of an absorbent article of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view (corresponding to FIG. 2) showing a sanitary napkin as a reference embodiment of the absorbent article of the present invention.
4 is a cross-sectional view (corresponding to FIG. 2) showing a sanitary napkin as a reference embodiment of the absorbent article of the present invention.
FIG. 5 is a cross-sectional view (corresponding to FIG. 2) showing a sanitary napkin as another embodiment of the absorbent article of the present invention.
[Explanation of symbols]
1, 1 'sanitary napkin (absorbent article)
2 Surface sheet 3 Leak-proof sheet 4 Absorber 5 Sheet (other sheets)
6 Flap part 7 Adhesive

Claims (3)

It has a liquid-permeable surface sheet, a liquid-impermeable and breathable leak-proof sheet, and a liquid retaining absorbent interposed between the two sheets, and a flap portion extending outward in the width direction is formed. In the absorbent article in which the non-skin contact surface side is provided with an adhesive for preventing misalignment,
At least, there is no leak-proof sheet in the part where the adhesive is disposed in the flap part,
Said flap portion, said a liquid-impermeable sheet is a top sheet and with any specific body of the barrier sheet, is composed of said topsheet or said barrier sheet, the liquid impermeable sheet is the absorbent article extending outwardly of the side portions directly covering decoction width direction of the absorber, and wherein the adhesive on the liquid-impermeable sheet is disposed.   The absorbent article according to claim 1, wherein the liquid-impermeable sheet is bonded to upper surface regions on both sides of the absorbent body and extends outward in the width direction.   The absorbent article according to claim 1 or 2, wherein a tear strength of the liquid impermeable sheet is 160 cN or more in the CD direction and 80 cN or more in the MD direction.

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