JP2008011932A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article being fixed to clothes without impairing the softness and the worn operability, little sliding to the clothes, and having improved fitting property and leakage prevention property. <P>SOLUTION: This absorbent article is formed with a nonadhesive slip-prevention layer lowering the sliding property to the clothes inner face in a part or the whole of a liquid impermeable back sheet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an absorbent article that is used after being attached to clothing such as sanitary napkins and incontinence pads.

In general, absorbent articles such as sanitary napkins and incontinence pads are provided with an adhesive portion on a non-skin-contacting surface and are fastened to clothing such as underwear and paper diapers via the adhesive portion.
Moreover, what constituted so that an absorptive article may be fixed to clothing by engaging means, such as a mechanical fastener mechanism, instead of an adhesion part or with an adhesion part is also known.
Here, in this kind of absorbent article, if a deviation or twist occurs during mounting, it may cause leakage, so that it is necessary to sufficiently prevent the shift or twist during mounting.
In the conventional example, the adhesive part and the mechanical fastener part are extensively formed on the non-skin contact surface, and the fastening area with respect to the clothing is widened to increase the fastening force, thereby preventing the displacement and the shaking.
JP 09-253131 A JP2005-007021 Patent 3605535

However, in this type of absorbent article, the adhesive part is protected by a release paper or the like before use, and during use, the release paper is peeled off from the adhesive part to expose the adhesive part. Work is carried out, but if the adhesive part is in a wide range, an accident in which the adhesive part adheres before the release paper is peeled off and fastened is likely to occur, which is preferable in terms of handling and handling properties. is not.
On the other hand, when adopting a mechanical fastener mechanism, a highly rigid male material or female material is formed in a wide range of absorbent articles or clothing, which is preferable in terms of deterioration in fit and wearability at the time of wearing. It is not a thing.
Therefore, the main problem of the present invention is that the absorbent article can be fastened to the clothes without impairing the softness and operability at the time of wearing, has less slipping on the clothes, and has improved fit and leakage prevention properties. Is to provide.

The present invention that has solved the above problems and the problems thereof are as follows.
<Invention of Claim 1>
An absorbent article having a liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets,
An absorbent article comprising a non-sticking anti-slip layer for reducing slipping on the clothes on a part or all of the liquid-impermeable back sheet.

(Function and effect)
Since the anti-slip layer that reduces the slipping property against the clothes is formed, it is possible to prevent slippage and twisting during wearing. In addition, since the anti-slip layer is non-wearing, handling properties at the time of wearing are not deteriorated. Further, since the anti-slip layer is non-wearing, there is no risk of damage to clothing or the absorbent article during replacement of the absorbent article.

<Invention of Claim 2>
To have a liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets, and to adhere to a part of the liquid-permeable back sheet on the inner surface of the clothing An absorbent article having a fastening portion of
An absorbent article comprising a non-sticking anti-slip layer that reduces slipping on the inner surface of the clothing on a part or all of the liquid-impermeable back sheet.

(Function and effect)
Since the anti-slip layer that reduces the slipping property against the clothes is formed, it is possible to prevent slippage and twisting during wearing. In addition, since the anti-slip layer is non-wearing, handling properties at the time of wearing are not deteriorated.
Furthermore, since the anti-slip layer is provided, there is no need to strengthen the fixing portion, and the area of the fixing portion can be reduced.
Further, since the area of the fastening portion can be reduced in this way and the anti-slip layer of the present invention is non-wearing, there is a significant risk of damage to the clothing or the absorbent article when the absorbent article is replaced. Less.
Moreover, by having a fastening part, it is excellent in the convenience at the time of mounting | wearing with clothing, and a sense of unity with clothing is obtained.
Here, the non-wearing property means that it does not have a function of maintaining the state of adhesion to the clothing, has substantially no fastness to the clothing, and preferably has no self-wearing property. A fastening part that maintains at least the adhesive state and the adhesive state with the mechanical fastener mechanism is not non-wearing. Further, the slipperiness is the degree of sliding in the shearing direction in the state of being in contact with the clothes.

<Invention of Claim 3>
The absorbent article according to claim 1 or 2, wherein the anti-slip layer is a layer having elasticity or elastic stretchability.

(Function and effect)
Since the anti-slip layer is made elastic or elastic stretchable, it is possible to improve the fit at the time of wearing and secure the softness.

<Invention of Claim 4>
The absorbent article according to any one of claims 1 to 3, wherein the anti-slip layer forming portion has a higher coefficient of friction with respect to the inner surface of the clothing than the non-slip layer non-forming portion excluding the adhesive portion.

(Function and effect)
If the anti-slip layer increases the coefficient of friction, non-adhesiveness and slip reduction can be easily ensured.

<Invention of Claim 5>
The absorbent article according to any one of claims 1 to 4, wherein the anti-slip layer is formed by applying or fusing an anti-slip agent to the liquid-impermeable back sheet.

(Function and effect)
An anti-slip layer can be easily formed.

<Invention of Claim 6>
The absorbent article according to claim 5, wherein the anti-slip agent comprises at least one of a hot melt adhesive, a thermoplastic resin, a thermoplastic elastomer, natural rubber, and synthetic rubber.

(Function and effect)
Hot melt adhesives, thermoplastic resins, thermoplastic elastomers, natural rubbers, and synthetic rubbers can be applied or fused, for example, to ensure non-adhesiveness and slipperiness-reducing functions, and can provide elasticity or elastic stretchability. Therefore, it is suitable for the formation application of the anti-slip layer. Note that the hot melt adhesive described here exhibits an adhesive function when heated, but does not exhibit an adhesive function at the temperature during use.

<Invention of Claim 7>
The hot melt adhesive according to any one of claims 1 to 6, wherein the hot melt adhesive is a hot melt adhesive containing silicon or a hot melt adhesive having a content of an adhesion-imparting component of 0 to 10% by weight. Absorbent article.

(Function and effect)
As the hot melt adhesive, a hot melt adhesive containing silicon or a hot melt adhesive in which the content of the adhesion imparting component is 10% by weight or less of its own weight is suitable. Here, the adhesion-imparting component is contained for the purpose of ensuring the adhesiveness of the hot melt adhesive or for the purpose of ensuring the tackiness at room temperature.

<Invention of Claim 8>
The absorbent article according to any one of claims 1 to 7, wherein the anti-slip layer is disposed in a dot shape, a line shape, or a mesh shape on the liquid-impermeable back sheet.

(Function and effect)
By arranging in a dot shape, a line shape, or a mesh shape, the roughening effect of the liquid-impermeable back sheet is obtained, which contributes to a decrease in slipperiness. For example, when the layer is formed by coating or fusion, the amount of the coating material or fusion material used can be reduced.

<Invention of Claim 9>
The absorptive article according to any one of claims 1 to 8, wherein a static friction coefficient of a portion excluding a fastening portion on a non-slip layer forming surface of the back sheet is in a range of 0.30 to 2.00.

(Function and effect)
If the coefficient of static friction of the part other than the fastening part of the anti-slip layer forming surface of the back sheet is in the range of 0.30 to 2.00, the slipperiness can be lowered without damaging the clothing, Sufficient displacement and twisting are prevented. In addition, the static friction coefficient in this invention is the value of the static friction coefficient of the said part and nonwoven fabric measured according to the horizontal method of JISP8147.

<Invention of Claim 10>
The absorptive article according to any one of claims 1 to 9 whose initial tack value of a portion except a fixed part of a non-slip layer formation side of a back sheet is 10gf / 40mm or less.

(Function and effect)
If the initial tack value for cotton or non-woven fabric is 10 gf / 40 mm or less, there is substantially no fastening function, and there is no unnecessary adhesive force. Therefore, the absorbent article is excellent in handling at the time of wearing and easy to handle. Become.
Here, the initial tack value in the present invention is a peak value of peel strength when the test piece is peeled after being pressed.

<Invention of Claim 11>
The absorbent article according to claim 1, wherein the color of the anti-slip layer is different from the background color of the liquid-impermeable back sheet.

(Function and effect)
If the color of the non-slip layer is different from the background color of the liquid-impermeable back sheet, the anti-slip layer will be excellent in visibility, and its presence and position can be easily judged, so that the absorbent article The determination of the front and back surfaces is facilitated, and the effect of speeding up the mounting is obtained.

  As described above in detail, according to the present invention, the absorbent article can be adhered to clothing without impairing softness and operability at the time of wearing, and there is little slipping on the clothing, thus having high fit and leakage prevention properties. Is provided.

Next, embodiments of the present invention will be described in detail with reference to the drawings. The absorbent article of the present invention has a liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets, and part of the liquid-impervious back sheet This is an absorbent article having a fastening part for fastening to the inner surface of the clothing. Characteristically, a non-sticking anti-slip layer that reduces the slipping property with respect to the inner surface of the clothes is formed on a part or all of the liquid-impermeable back sheet.
Clothes are underwear, disposable diapers, and the like. Hereinafter, in order to explain more specifically, an absorbent pad and a sanitary napkin using the absorbent article of the present embodiment in combination with a paper diaper will be described as an example.

<Example of absorbent pad>
The absorbent pad X1 according to the first embodiment shown in FIGS. 1 to 3 is disposed between the barrier cuffs 2B and 2B of the paper diaper Y1, and is attached to and integrated with the paper diaper Y1 to improve the absorption of body fluid. It is often used for the purpose of reducing the number of times the entire paper diaper is replaced when urinating a small amount of urine such as light urine leakage and improving convenience.

  A conventionally known diaper Y1 is used. The paper diaper Y1 according to the present embodiment is a so-called clothing mode, as is apparent from FIG. 1, by locking the locking tapes 6 and 6 provided on both sides of the back side waist part to the locking part 7 of the ventral side abdomen. Although this is called a tape-type paper diaper and will be described below based on this example, the present absorbent pad X1 can also be used for other types of paper diapers generally called pants.

  The paper diaper Y1 of this embodiment of the illustrated example is more specifically a liquid-permeable top sheet 1 positioned on the user's skin side and a liquid-impermeable back sheet 2 positioned outside the product and substantially impermeable to liquid. And an absorbing element 3 having a certain degree of rigidity, such as a rectangular or preferably hourglass shape, is interposed therebetween.

  The liquid-impermeable back sheet 2 is a microporous resin sheet obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Are preferably used. The liquid-impermeable back sheet 2 is more preferably one in which an exterior sheet made of a nonwoven fabric or the like is laminated on the outer surface of the resinous sheet in order to improve the touch.

  As the liquid-permeable top sheet 1, it is preferable to use a net-like sheet material obtained by plain weaving such as nylon or polyethylene terephthalate, a film sheet material having a large number of through holes, or a film sheet material such as polyethylene or polypropylene. is there. Accordingly, the liquid-permeable top sheet 1 extends outward from the side edge of the absorbent element, and is bonded to the liquid-impermeable back sheet 2 with a hot melt adhesive (not shown) or the like.

  The absorbent element 3 can take a known mode in which a piled pulp or the like in which an absorbent polymer is contained is wrapped with a liquid-permeable sheet such as a crepe paper, a nonwoven fabric sheet, or a perforated sheet. Examples of superabsorbent polymers include carboxymethylcellulose, polyacrylic acid and its salts, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, hydrolyzate of starch-acrylonitrile graft copolymer, and polyoxyethylene crosslinked Products, crosslinked products of carboxymethyl cellulose, polyethylene oxide, polyacrylamide and other partially crosslinked polymers, or a copolymer of isobutylene and maleic acid are preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. In addition, the superabsorbent polymer has various forms such as powder, particles, granules, pellets, sol, suspension, gel, film, and nonwoven fabric. Any of them can be used in the present invention, and a particulate material is particularly preferably used.

  The fastening tapes 6 and 6 are known ones in which a male material of a mechanical fastener is arranged in a part, and this male material part is engaged with an engaging part 7 made of a female material arranged on the abdomen side and is worn. It becomes an aspect.

  On the other hand, the skin contact surface side of the diaper Y1 of this embodiment is erected along the longitudinal direction on the skin side by the elastic elastic members 4 and 4 for lifting provided along the longitudinal direction (front-rear direction). So-called barrier cuffs 1B and 1B are provided. The specific configuration of the barrier cuffs 1B and 1B is not particularly limited. Other than the illustrated example, conventionally known configurations of the barrier cuffs 1B and 1B can be appropriately employed.

  The absorbent pad X1 according to the present invention has a substantially rectangular shape in plan view that is long in the front-rear direction, and is disposed between the barrier cuffs 1B and 1B. About the position of the front-back direction, it is possible to arrange | position to an appropriate position according to a user's sex and a body.

  The absorbent pad X1 includes a liquid-permeable top sheet (hereinafter also simply referred to as a front sheet) 11, a liquid-impervious back sheet (hereinafter also simply referred to as a back sheet) 12, and an absorbent interposed between the two sheets. It has a liquid core 13. The size of the absorbent pad can be appropriately determined in consideration of the size of the paper diaper Y1. The surface sheet 11 can be formed of a nonwoven fabric. The nonwoven fabric is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyethylene or polypropylene, recycled fibers such as rayon or cupra, and cotton as constituent material fibers. A non-woven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond 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. Further, it may be a non-woven fabric having a layer structure such as an SMS non-woven fabric, a point bond non-woven fabric, a plastic film such as a polyethylene film, or a laminated non-woven fabric obtained by laminating a plastic film and a non-woven fabric.

  For the back sheet 12, for example, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a waterproof film is used. A nonwoven fabric sheet or the like that has been interposed to ensure substantially liquid impermeability can be used.

  The absorbent core 13 takes a known mode in which a conventionally known absorbent core 12A such as a piled pulp in which an absorbent polymer is contained is wrapped with a liquid-permeable sheet such as a crepe paper 3, a nonwoven fabric, or a perforated sheet. be able to.

  Examples of superabsorbent polymers include carboxymethylcellulose, polyacrylic acid and its salts, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, hydrolyzate of starch-acrylonitrile graft copolymer, and polyoxyethylene crosslinked Products, crosslinked products of carboxymethyl cellulose, polyethylene oxide, polyacrylamide, and other partially crosslinked polymers, or a copolymer of isobutylene and maleic acid are preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. The superabsorbent polymers include various forms such as powder, particles, granules, pellets, sols, suspensions, gels, films, and nonwovens. Any of them can be used in the present invention, and in particular, particles are preferably used.

  Here, an anti-slip layer 14 is characteristically formed on the back side (the side facing the clothing) of the absorbent pad X1. The anti-slip layer 14 is not particularly limited as long as the anti-slip layer 14 is a layer that does not adhere to clothing and reduces slipperiness, but preferably, a layer having a higher coefficient of friction than the material of the back sheet 12, or This is a layer that has the effect of improving the coefficient of friction of the entire back sheet.

  The anti-slip layer 14 of this embodiment is provided in such a manner that the anti-slip agent is applied to the entire surface facing the clothing of the back sheet. The anti-slip layer 14 is non-sticking and does not have adhesiveness to the top sheet of the paper diaper. The non-wearing property means that there is substantially no sticking property to clothing and does not have a function of maintaining an adhesive state.

  As the anti-slip agent, for example, a hot melt adhesive, a thermoplastic resin, a thermoplastic elastomer, natural rubber, synthetic rubber, or a material containing these is suitable. Silicon-containing hot-melt adhesives, especially hot-melt adhesives, natural rubber, and synthetic rubbers with an adhesion-providing component content of 0 to 10% by weight (preferably 0 to 5% by weight, especially 0% by weight) Rubber is preferable because it can ensure non-wearing properties, has a certain degree of elasticity, can maintain good softness and fit, and can effectively reduce slipperiness with clothing.

  The hot melt adhesive in this technical field includes at least a base polymer, a solid-state adhesiveness-imparting component at normal temperature, a plasticizer component, and an antioxidant as constituent components.

  The adhesiveness-imparting component is used for the purpose of exerting adhesiveness during heating or for the purpose of ensuring tackiness at room temperature. Generally, the adhesiveness-imparting component is about 11% by weight to about Although 60% by weight is contained, in the present invention, it is particularly desirable to make this less than 10% by weight. Specific examples of adhesion-imparting components include rosin resins, polyterpene resins, terpene phenol resins, dicyclopentadiene petroleum resins, aliphatic petroleum resins, aromatic petroleum resins, copolymer petroleum resins, alicyclic rings. Examples thereof include one or a mixture of two or more selected from the group consisting of group petroleum resins, xylene resins and elastomers.

  Also, waxes are suitable as the plasticizer component used in the hot melt adhesive, and as such waxes, paraffin waxes, microcrystalline waxes, polyethylene waxes, polypropylene waxes, by-product polyethylene waxes are used. Functionalized waxes such as Fischer-Tropsch waxes, oxidized Fischer-Tropsch waxes and hydroxy stearamide waxes and fatty acid amide waxes are preferably used. Especially in the field of absorbent articles, the use of synthetic high melting point waxes including high density low molecular weight polyethylene waxes, by-product polyethylene waxes and Fischer-Tropsch waxes is suitable. Moreover, modified waxes such as vinyl acetate modified and maleic anhydride modified, and oxidized wax can also be used. If waxes are used, they should be added in an amount of about 10% to about 60% by weight, more preferably 25% to 45% by weight, and still more preferably 30% to 40% by weight. The melting point of the wax to be used is 49 to 93 ° C, preferably 54 to 77 ° C, particularly preferably 63 to 74 ° C.

  On the other hand, antioxidants used in hot melt adhesives include high molecular weight hindered phenols and polyfunctional phenols such as sulfur and phosphorus containing phenols. Representative hindered phenols are 1,3,5-trimethyl-2,4,6-tris- (3,5-di-tert-butyl-4-hydroxybenzyl) -benzene, pentaerythrityl tetrakis-3. (3,5-di-t-butyl-4-hydroxyphenyl) -propionate, n-octadecyl-3 (3,5-di-t-butyl-4-hydroxyphenyl) -propionate, 4,4′-methylenebis ( 2,6-t-butyl-phenol), 4,4′-thiobis (6-t-butyl-o-cresol), 2,6-di-t-butylphenol, 6- (4-hydroxyphenoxy) -2, 4-bis (n-octyl-thio) -1,3,5 triazine, (di-n-octylthio) ethyl 3,5-di-t-butyl-4-hydroxy-benzoate, or sorbitol Hexa [3- (3,5-di -t- butyl-4-hydroxy - phenyl) - propionate] is.

  In addition, antioxidants can be used together with known synergists such as thiodipropionate esters and phosphites. These serve to further enhance the performance of the antioxidant. In particular, distearyl thiodipropionate is useful. These stabilizers are generally used in an amount of about 0.1 to 1.5% by weight, preferably 0.25 to 1.0% by weight.

  In addition, as a base polymer of a hot melt adhesive or as a single thermoplastic resin for forming an anti-slip layer, a styrene block copolymer, a polyurethane block copolymer, a polyester block copolymer, or a polyamide block copolymer is used. Either a polymer or a copolymer blend can be suitably used. As the styrenic block copolymer, styrene-butadiene-styrene (S-B-S) or styrene-ethylenebutadiene-styrene (S-EB-S) can be used. As the copolymer blend, styrene-ethylenebutadiene-styrene / polypropylene (S-EB-S / PP) or polypropylene / ethylene-propylene (PP / EP) can be used. In addition, polyolefin-based thermoplastic resins can also be used. As the polyolefin, any of polyamide, polyester, polyethylene, and polypropylene can be used.

  The application method of the anti-slip agent is not particularly limited, and an appropriate coating machine or a printing machine can be used depending on the viscosity of the anti-slip agent. The thermal fusion method, which is often used when using hot-melt adhesives, is applied by heat fusion after heat-spreading after spreading a solid material, or thermocompression bonding with pressure and heat, either alone or together with the previous application method. be able to. Embossing can also be performed during thermocompression bonding.

  The anti-slip layer 14 is provided in such a manner that, for example, a natural rubber sheet, a synthetic rubber sheet, various resin films, a resin sheet, or the like is laminated and heat-bonded to the back sheet, preferably laminating and thermocompression bonding while applying pressure. It is also possible. At this time, embossing can be performed as necessary.

The basis weight of the slip layer 14, point 1-200 g / m ² from the softness retention, preferably it is preferable to the 3~100g / m ^2. The thickness is preferably 3 to 200 μm, preferably 10 to 100 μm, from the viewpoint of maintaining softness. If it is less than 1 μm, there is a risk of peeling when a shearing force is applied to the clothing, and if it is too thick, the rigidity becomes high and it is not preferable from the viewpoint of ensuring softness.

  On the other hand, the absorbent pad X1 is provided with fastening portions 15 at the front and rear portions in the longitudinal direction for fastening to the liquid-permeable top sheet 1 of the paper diaper Y1. What is necessary is just to determine suitably the position and magnitude | size of the fixing | fixed part 15 according to a prior art. The fastening part 15 of this embodiment exhibits a fastening function with respect to the top sheet of the paper diaper due to adhesiveness. This fastening part can be formed by applying an adhesive or bonding an adhesive sheet.

  Moreover, a fastening part can also be formed with the hot-melt-adhesive provided with the adhesiveness of the grade which has a fastening function. In this case, for example, a non-adhesive hot melt adhesive is used for forming the above-mentioned anti-slip layer, and an adhesive hot melt adhesive having an adhesive property is used in combination for forming the adhesive part. Thus, an embodiment in which both are formed by a hot melt adhesive can also be taken as a form of the present invention.

  Here, the adhesive fastening part 15 is usually protected by release paper in order to prevent adhesion to an unintended part by the adhesive 15 except during use. The pressure-sensitive adhesive, pressure-sensitive adhesive sheet, and release paper can be appropriately selected from those conventionally used in absorbent pads, sanitary napkins, and the like.

  Moreover, a mechanical fastener can also be taken as the fastening part 15 of the absorption pad X1. For example, a male fastener piece of a mechanical fastener is firmly attached to the absorbent pad X1 and a female agent piece of a mechanical fastener is firmly attached to the side of the paper diaper so as not to be peeled off. You can also The mechanical fastener mechanism in this case can also be appropriately selected from the techniques disclosed in the related art for fastening sanitary napkins or for tape-type paper diaper fastening tapes.

  On the other hand, in the absorbent pad of this embodiment, the static friction coefficient of the portion excluding the fastening portion of the anti-slip layer forming surface of the back sheet is in the range of 0.30 to 2.00, preferably in the range of 1.0 to 1.8. It is desirable to be in If the coefficient of static friction is less than 0.30, it is slippery, and if it exceeds 2.00, the surface of the clothing may be damaged, for example, there may be harmful effects such as fluffing of the nonwoven fabric. When a strong shearing force is applied between the two, a buffering effect due to the shift cannot be obtained, and the possibility of causing a twist increases. In addition, it is more desirable that the dynamic friction coefficient of these parts is in the range of 0.25 to 1.5, preferably 0.50 to 1.25.

  For reference, when the present inventors measured the friction coefficient of the back surface sheet of some commercially available absorbent pads, the static friction coefficients were all less than 0.20, and the dynamic friction coefficients were all less than 0.18. there were. In this embodiment, since the anti-slip layer is formed on the entire back sheet, the target portion (range) of the dynamic friction coefficient is all the anti-slip layer forming portion (range). In the arranged example, the range in which the anti-slip layer forming portion and the non-forming portion coexist is the target range of the dynamic friction coefficient.

Here, the dynamic friction coefficient referred to in the present invention is a value of the dynamic friction coefficient between the portion and the nonwoven fabric, which is measured according to the horizontal method of JIS P 8147. More specifically, the nonwoven fabric has a basis weight in the range of ²⁰ to 22 g / m ² , a fineness in the range of 2.0 to 2.1 dtex, and is measured based on the horizontal method of JIS P 8147. A nonwoven fabric having a dynamic friction coefficient of 0.05 to 0.07 and a static friction coefficient of 0.019 to 0.021 is used. A PE / PP hydrophilic air-through nonwoven fabric is particularly suitable as such a nonwoven fabric. Next, for the measurement operation, the moving speed at the time of measurement is set to 300 mm / min.

  On the other hand, the absorbent pad of this embodiment has an initial tack value of 10 gf / 40 mm or less, preferably 5 gf / 40 mm or less, in the portion excluding the fastening portion of the anti-slip layer forming surface of the back sheet. If it exceeds 10 gf, the tackiness is increased and the protective release paper becomes essential, or the function of fixing to clothing is exhibited, and the handling properties and handling properties deteriorate.

  Here, the initial tack value referred to in the present invention is a test piece (a part of the back sheet) having a width of 50 mm and a length of 90 mm on a cotton cloth (gold width 3) or a nonwoven fabric cut into a width of 80 mm and a length of 100 mm. Are stacked so that the non-slip layer forming surface (width 40 mm x length 40 mm) is on the cotton cloth side, and then a 2 kg roll is rolled on the test piece 3 times in the length direction to apply pressure, followed by a tensile test. It is a peak value of peel strength when a test piece is peeled from one end with a machine. The peeling rate during the peeling operation was 300 mm / min, and the initial tack value = 0 when no peak value was observed during the measurement. When using a non-woven fabric, the same one used in the method for measuring the static friction coefficient is used.

Here, although the initial tack value referred to in the present invention is for cotton cloth, the initial tack value [PE] for the polyethylene sheet (PE sheet) is 100 gf / 40 mm, preferably less than 50 gf / 40 mm. Is more desirable. The initial tack value [PE] may be measured by changing the initial tack value cotton cloth or the like to a 30 g / m ² PE sheet. Moreover, although the initial tack value [PE] is higher than that for cotton cloth, even if the initial tack value [PE] is such that the surface smoothness and surface strength of the PE sheet are higher than those of the cotton cloth, it is fixed. There is no problem of handling properties due to adhesiveness and adhesiveness.

  Here, when the present inventors measured the initial tack value of the adhesive fastening part in the back surface sheet of some commercially available absorbent pads, it exceeded 95 gf / 40 mm for all cotton fabrics and nonwoven fabrics. The initial tack values [PE] were all over 980 gf / 40 mm.

  As described above, the absorbent pad X1 is secured to the paper diaper by the adhesive fastening part 15, and the integrity of the paper diaper Y1 and the absorbent pad X1 is improved by the action of the anti-slip layer 15. Deviations and kinks when a person moves are effectively prevented.

<Example of sanitary napkin>
Next, a sanitary napkin will be described as an example. Various types of sanitary napkins are known, such as daytime, nighttime, winged type, and non-typed types, but the configuration of the absorbent article of the present invention is an embodiment that is fastened to underwear such as shorts. Applicable to napkins in general. The present embodiment is a daytime wing-type sanitary napkin, which will be described as an example. The sanitary napkin X2 of this embodiment shown in FIGS. 4 and 5 has wings W, W formed so as to protrude in the width direction at a substantially central portion in the front-rear direction of the product.

  According to the present invention, this sanitary napkin X2 has a liquid-permeable top sheet 1, a liquid-impervious back sheet 2, and a liquid-absorbent core 3 interposed between the two sheets. Although it has the fixing | fixed part 15,15 ... for fixing to a clothing inner surface in a part on back sheet 1, these liquid-permeable surface sheets 1, liquid-impermeable back sheet 2, and absorption core 3, Since the specific material and configuration of the fastening portion 15 are the same as those of the above-described absorption pad X1, description thereof will be omitted. Of course, the amount of the absorbent polymer used need not be the same as that of the absorbent pad, and can be appropriately changed according to the specification mode.

  In the sanitary napkin X2 of the present embodiment, the adhesive fastening portions 15 are provided in the wing portions W and W in addition to the longitudinal front and rear portions, and the front and rear portions are fastened to the inner surface of the shorts when worn, The wings W, W are fastened to the outer surface of the shorts so as to involve the crotch crotch part of the shorts.

  At the same time, the anti-slip layer 14 comes into contact with the inner and outer surfaces of the shorts to reduce the slipperiness and prevent displacement and twisting.

  Here, since the anti-slip layer 14 of the present invention is non-wearing, it does not particularly affect the packaging of sanitary napkins. It is possible to adopt various packaging methods such as a mode in which the adhesive fastening part is protected with a release paper or a film material and the release paper or the like is used as an exterior.

  The characteristics of the anti-slip layer 14 may be the same as described in the column of the absorption pad. Regarding the coefficient of friction in particular, since the shorts are often cloth, it is desirable that the coefficient of dynamic friction with respect to the cloth is in the range of 0.25 to 1.5, preferably in the range of 0.50 to 1.25.

  As described above, the sanitary napkin X2 is securely fastened to underwear such as shorts by the effect of the shorts due to the wing and the adhesive fastening part, and is further displaced and twisted by the action of the anti-slip layer. Is prevented. In particular, in the case of a sanitary napkin, the action of the anti-slip layer being pressed against the shorts due to body pressure is high, and the effect of improving the adhesion between the shorts and the sanitary napkin or the followability of the sanitary napkin is also obtained.

<Others>
The absorbent pad X1 and sanitary napkin Y1 in the above example are examples in which an anti-slip layer is provided on the entire surface of the liquid-impermeable back sheet, but the anti-slip layer is not necessarily provided on the entire surface, and the air permeability of the back sheet is not necessarily provided. From the viewpoint of securing the softness of the absorbent article and the softness of the absorbent article, as shown in FIGS.

  Here, it is desirable that the anti-slip layer 14 is 2% or more in terms of a ratio area ratio (%) to the entire back sheet. If it is 2% or more, the anti-slip effect can be reliably obtained. When the present inventors provided a line-shaped anti-slip layer with a width of 5 mm in the width direction at the front and rear ends of a commercially available absorbent pad, this is approximately 2% of the back surface area of the absorbent pad. It is based on the fact that the improvement of the anti-slip effect was discovered. In addition, as for this commercially available absorption pad, the area ratio of a non-slip | skid layer will be 97% if all except an adhesive fastening part of 40 mm x 40 mm is made into a non-slip | skid layer.

  As an arrangement pattern of the anti-slip layer, for example, as shown in FIG. 6, a plurality of anti-slip layers are arranged in a line along the product longitudinal direction, or along the width direction of the product as shown in FIG. A plurality of anti-slip layers can be provided in a line. Or as shown in FIG. 8, the anti-slip | skid layer may be provided so that it may become a mesh pattern. In addition, as shown in FIG. 9, it can also be provided in a substantially hourglass shape depending on the location where body pressure is likely to be applied at the time of wearing. If it is provided in a place where body pressure is easily applied in this way, it is pressed against the clothing when worn, and a further anti-slip effect can be expected.

  Further, it is desirable to color the anti-slip agent layer. For example, in the case of the above-described whole surface application form, the surface on which the anti-slip layer is formed can be visually determined instantaneously. That is, it is easy to determine the front and back of the absorbent article. Furthermore, in the anti-slip layer arranged in various patterns, in particular, if it is colored in a color different from the background color of the back sheet, it is clear that the anti-slip layer is formed in addition to the determination of the front and back of the absorbent article It can be visually recognized and it can be visually felt that an anti-slip effect is obtained.

  As described above in detail, any of the absorbent articles according to the present embodiment exhibits a suitable anti-slip effect, and exhibits a function of preventing a deviation and a deviation at the time of wearing, and a leakage caused by the deviation.

  INDUSTRIAL APPLICABILITY The present invention can be used to prevent slippage between a disposable diaper and clothing, as well as absorbent articles that are used by being secured to clothing such as a sanitary napkin, an absorbent pad, and a urine collection pad.

It is a figure for demonstrating the combined use example of the absorption pad concerning this invention, and a paper diaper. It is the II-II sectional view. It is a reverse view of the absorption pad of this form. It is a reverse view of the sanitary napkin concerning this invention. It is the VV sectional view. It is an absorptive article back view showing the example of the 1st arrangement pattern of the antiskid layer of the absorptive article of the present invention. It is an absorbent article back view which shows the 2nd arrangement pattern example of the anti-slip | skid layer of the absorbent article of this invention. It is an absorptive article back view showing the example of the 3rd arrangement pattern of the antiskid layer of the absorptive article of the present invention. It is an absorptive article back view showing the example of the 4th arrangement pattern of the antiskid layer of the absorptive article of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid-permeable top sheet, 1B ... Barrier cuff, 2 ... Liquid-impermeable back sheet, 3 ... Absorbing element, 4 ... Elastic elastic member (thread rubber), 6 ... Fastening tape, 7 ... Locking part, DESCRIPTION OF SYMBOLS 11 ... Liquid-permeable surface sheet, 12 ... Impervious back sheet, 13 ... Absorption core, 14 ... Anti-slip layer, 15 ... Fastening part, W ... Wing part, X ... Absorbent article, X1 ... Absorption pad, X1 ... sanitary napkin, Y1 ... paper diaper.

Claims (11)

An absorbent article having a liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets,
An absorbent article comprising a non-sticking anti-slip layer for reducing slipping on the clothes on a part or all of the liquid-impermeable back sheet. A liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets, for fastening to clothing on a part of the liquid-impervious back sheet An absorbent article having a fastening portion,
An absorbent article comprising a non-sticking anti-slip layer for reducing slipping on the clothes on a part or all of the liquid-impermeable back sheet.   The absorbent article according to claim 1 or 2, wherein the anti-slip layer is a layer having elasticity or elastic stretchability.   The absorbent article according to any one of claims 1 to 3, wherein the anti-slip layer forming portion has a higher coefficient of friction with respect to the inner surface of the clothing than the non-slip layer non-forming portion excluding the adhesive portion.   The absorbent article according to any one of claims 1 to 4, wherein the anti-slip layer is formed by applying or fusing an anti-slip agent to the liquid-impermeable back sheet.   The absorbent article according to claim 5, wherein the anti-slip agent comprises at least one of a hot melt adhesive, a thermoplastic resin, a thermoplastic elastomer, natural rubber, and synthetic rubber.   The absorption according to any one of claims 1 to 6, wherein the hot melt adhesive is a hot melt adhesive containing silicon or a hot melt adhesive having a content of an adhesion-imparting component of 0 to 10 weights. Sex goods.   The absorbent article according to any one of claims 1 to 7, wherein the anti-slip layer is disposed in a dot shape, a line shape, or a mesh shape on the liquid-impermeable back sheet.   The absorptive article according to any one of claims 1 to 8, wherein a static friction coefficient of a portion excluding a fastening portion on a non-slip layer forming surface of the back sheet is in a range of 0.30 to 2.00.   The absorptive article according to any one of claims 1 to 9 whose initial tack value of a portion except a fixed part of a non-slip layer formation side of a back sheet is 10gf / 40mm or less.   The absorbent article according to claim 1, wherein the color of the anti-slip layer is different from the background color of the liquid-impermeable back sheet.

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