JP4522021B2 - 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 for absorbing menstrual blood, vaginal discharge, and the like.
[0002]
[Prior art]
Conventionally, as an absorbent article such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, a liquid-impervious back sheet made of a polyethylene sheet or a polyethylene laminated nonwoven fabric, and a transparent article made of a nonwoven fabric or a porous plastic sheet. There is known a liquid surface sheet in which an absorbent body made of cotton-like pulp or the like is interposed.
[0003]
In this type of absorbent article, an adhesive layer 60 is formed on the non-use surface side (the outer surface of the liquid-impermeable back sheet) as shown in FIG. When the absorbent article is mounted, the pressure-sensitive adhesive layer 60 is adhered to the shorts so that the absorbent article is not displaced.
[0004]
Various forms are adopted as the formation pattern of the anti-displacement adhesive layer 60, and one or a plurality of adhesive layers are formed in a line shape along the longitudinal direction of the absorbent article. In which a plurality of pressure-sensitive adhesive layers are formed in a line shape along the short direction of the absorbent article. Among these pressure-sensitive adhesive layer pattern groups, the formation pattern for forming a large number of pressure-sensitive adhesive layers in a line shape along the short direction of the latter absorbent article is as shown in Japanese Utility Model Publication No. 6-63023. It is a formation pattern often found in absorbent articles when the individual packaging sheet has the release tape function of the adhesive layer.
[0005]
[Problems to be solved by the invention]
However, as the pattern of the pressure-sensitive adhesive layer, as shown in FIG. 6, it is formed with the same coating width (length in the short direction of the absorbent article) from the product front end part to the product rear end part of the absorbent article. In the absorbent article, when the absorbent article is fixed to shorts, if the coating width is long, both ends of the pressure-sensitive adhesive layer may protrude from the shorts at the crotch region. When the application width is short, it has been pointed out as a problem that the end of the product is displaced due to the movement of the body.
[0006]
In addition, when wearing absorbent articles, especially in the crotch area, a complex force is applied such as receiving pressure in the width direction from the base of the foot, applying a twist, or applying a shearing force. Become. Due to these acting forces, both sides of the absorbent body are crushed to the center side, causing twisting or forming large vertical wrinkles along the longitudinal direction. In some cases, the pressure-sensitive adhesive layer is re-adhered to other parts and the deformation state is restricted, or leakage is caused by the vertical wrinkles.
[0007]
In order to solve this problem, Japanese Patent Application Laid-Open No. 63-54161 discloses that the formation pattern of the adhesive for preventing misalignment is a capital letter I shape, and the adhesive area is enlarged at both ends while the adhesive area is reduced at the crotch part. Thus, a method for preventing displacement and wrinkling of the absorbent article is proposed.
[0008]
However, in the case of the anti-displacement pressure-sensitive adhesive layer pattern described in JP-A-63-54161, the pressure-sensitive adhesive pattern in the crotch portion is one line along the longitudinal direction of the absorbent article and at the longitudinal center position. However, such a crotch adhesive pattern substantially completely liberates the movement of the absorber, and the body is excessively compressed by vigorous body movement. The shorts will be restored to its original state when subjected to twisting or twisting, but the vertical wrinkles formed on the absorber remain, and there is a problem that the vertical wrinkles generated on the absorber are likely to leak. Was discovered.
[0009]
Therefore, the main problem of the present invention is that in the absorbent article in which the adhesive slip prevention means is formed on the non-use surface side (outer surface), by properly defining the formation pattern of the adhesive slip prevention means for each part, Disclosed is an absorbent article that effectively prevents positional displacement of the entire absorbent article, and effectively prevents positional deviation of the absorbent body part that contributes to absorption in the crotch portion and occurrence of vertical wrinkles. It is in.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and adhesive slippage is prevented on the underwear contact surface side. In an absorbent article in which a means is formed, and a pair of left and right side side embossing is formed on the absorbent body on the surface of the absorbent body and / or on both sides of the absorbent body,
The adhesive misalignment stopping means has at least two or more patterns having different lengths in the short direction of the absorbent article, and has a relatively short length in the short direction in at least the crotch region of the absorbent article. A slip-off stop pattern is disposed, and an adhesive slip-off stop pattern having a relatively short lateral length is disposed at least in the front and rear end region of the absorbent article,
And in the crotch region, the position of the side edge of the adhesive anti-slip pattern is from the innermost side of the side edge of the absorber middle-high part or the pair of left and right side side fitting embosses in the short direction of the absorbent article. An absorbent article is provided that is present at a position of ± 5 mm.
[0011]
In the first aspect of the present invention, in the front and rear end regions of the absorbent article with little movement, the adhesive misalignment stopping means is lengthened in the short direction to increase the bonding area, and the entire absorbent article is underwear. Adhere securely to avoid misalignment.
[0012]
On the other hand, in the crotch region that receives pressure, tensile force, twist, etc. in the width direction, the length in the short direction of the adhesive slip prevention means is shortened, and the absorbent body sandwiched between the mid-high region of the absorbent body or the side fit emboss An adhesive misalignment stop means is disposed only in the region so as to adhere to the undergarment. Therefore, in the crotch region, the side region of the absorbent body can be freely deformed, and the deformed (vertical wrinkle) state by re-adhesion after deformation is not constrained. become. In addition, for the absorber region sandwiched between the absorber mid-high region or the side fit embossing, it is possible to reliably prevent positional displacement by adhering to the underwear, and the absorber is prevented by intense physical exercise. Even if it receives excessive compressive force or twisting, as the shorts are restored to the original state, the absorber is also restored to the original state and vertical wrinkles are eliminated, so leakage is effective. Will be prevented.
[0013]
According to a second aspect of the present invention, in the front and rear end region, the side end portion position of the adhesive misalignment pattern exists at a position of ± 5 mm from the absorbent side edge in the short direction of the absorbent article. The absorbent article described is provided.
[0014]
According to the second aspect of the present invention, in the front and rear end regions, the entire absorbent article is bonded so as not to be misaligned by bonding the substantially entire width of the absorbent body to the underwear. In addition, both end portions of the pressure-sensitive adhesive layer do not protrude from the shorts.
[0015]
As the present invention according to claim 3, the adhesive slip-preventing pattern has three or more patterns with different lengths in the short direction of the absorbent article, and is gradually shortened from the crotch region to the front and rear end regions. The absorbent article according to any one of claims 1 and 2, wherein the length in the hand direction is increased.
[0016]
According to the third aspect of the present invention, the longitudinal outline connecting the ends of the adhesive misalignment pattern becomes a substantially arc-shaped curve, and the adhesive force to the underwear gradually increases as the arc-shaped curve expands. This is preferable.
[0017]
According to a fourth aspect of the present invention, there is provided the absorbent article according to any one of the first to third aspects, wherein the adhesive displacement preventing means is a pressure-sensitive adhesive, a pressure-sensitive adhesive tape, or a surface fastener.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially broken development view of an absorbent article 1 according to the present invention, and FIG. 2 is a rear view thereof.
[0019]
[Structure of absorbent article]
The absorbent article 1 is a body-worn product that absorbs and retains bodily fluids discharged from the body, such as panty liners, sanitary napkins, vaginal discharge sheets, incontinence pads, and the like. An absorbent body 4 is interposed between the liquid-permeable surface sheet 3 and the liquid-permeable surface sheet 3. In the illustrated example, in order to improve the fit of the absorber 4 to the body and prevent side leakage or the like, the absorber middle height portion 6 thickened on the surface side in a range including a body fluid discharge portion H such as menstrual blood is provided. An arc shape which is formed and bulges inward along the side edge portion of the absorber middle height portion 6 in order to make the absorber middle height portion 6 stand out, stabilize the raised shape, and prevent side leakage The side fitting embosses 7 and 7 having a shape are formed in a pair of left and right, and the front and rear fitting embosses 8 and 8 having a substantially semicircular shape are formed in a pair of front and rear along the front and rear edges of the absorber middle high part 6. . Further, side sheets 5 and 5 are provided on both sides of the absorbent article 1.
[0020]
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as a polyethylene sheet is used. In addition to this, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, and further, a waterproof film is interposed. A non-woven sheet that is substantially impervious to liquid (in this case, a waterproof film and a non-woven sheet constitute a liquid-impervious back sheet) can be used. It may be.
[0021]
Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. 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.
[0022]
The absorber 4 interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 is composed of, for example, fluffy pulp and a water-absorbing polymer. The said absorptive polymer is mixed in the pulp which comprises a water absorption body, for example as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. The absorbent body 4 is desirably surrounded by crepe paper or the like in order to maintain the shape and improve the absorbability.
[0023]
[Formation pattern of adhesive slip prevention means]
As shown in the rear view of FIG. 2, the liquid-impervious back sheet 2, that is, the underwear contact surface in the mounted state, is formed with adhesive slip prevention means 10 having a predetermined pattern according to the present invention. As the adhesive slip prevention means 10, for example, those having physical properties showing adhesion to underwear such as pressure-sensitive adhesives, pressure-sensitive adhesive tapes and hook-and-loop fasteners are used, but in this embodiment, a hot which can be easily applied in an arbitrary pattern A slip prevention means is constituted by the melt adhesive. Therefore, in the following description, the slip prevention means 10 will be described as the pressure-sensitive adhesive layer 10. In addition, these are also illustrated in the rear view of FIG. 2 so that the relative positional relationship between the absorber middle high portion 6 and the side fit embosses 7 and 7 becomes clear.
[0024]
The adhesive misalignment stopping means 10 is formed along the short direction (hereinafter simply referred to as the short direction) of the absorbent article with an interval in the longitudinal direction (hereinafter simply referred to as the long direction) of the absorbent article. The line-shaped pressure-sensitive adhesive layer 10 is composed of a large number of line-shaped pressure-sensitive adhesive layers 10, and the line-shaped pressure-sensitive adhesive layer 10 along the short-side direction has at least two patterns different in the short-side direction length. It is constituted by.
[0025]
Specifically, the adhesive patterns 14, 14,... Having the shortest lateral length are arranged in the crotch region 11 including the body fluid discharge portion H, and the front and rear end regions 13A, 13B of the absorbent article. The adhesive patterns 16, 16,... Having the longest short direction length are arranged, and the intermediate regions 12A, 12B between the crotch region 11 and the front and rear end regions 13A, 13B have an intermediate length in the short direction. Agent patterns 15, 15... Are arranged. The pressure-sensitive adhesive patterns 14 to 16 are arranged symmetrically with respect to the longitudinal center line L. In this case, the ratio of the short-side distance between the adhesive pattern 14 disposed in the crotch region 11 and the adhesive pattern 16 disposed in the front and rear end regions 13A and 13B is approximately 1.5 to 2. It is desirable that
[0026]
First, in the crotch region 11, the side end positions (end position in the short direction of the absorbent article 1) of the adhesive patterns 14, 14... It exists in the position of +/- 5mm in the transversal direction of the absorbent article 1 from the innermost side point P of the part fitting embosses 7 and 7. FIG. In the illustrated example, since the side fit embosses 7 and 7 are formed along the side edges of the absorber middle high portion 6, the side edges of the absorber middle high portion 6 and the pair of left and right side fit embosses 7, 7 and the innermost side point P are substantially coincident with each other.
[0027]
In the present invention, in the crotch region 11, the side region K of the absorbent body 4 can be freely deformed with the movement of the body so that the absorbent article 1 is not adhered to the underwear. By making the absorber side region freely deformable, most of the acting force applied to the absorber, such as biased tensile force and twist, is absorbed and relaxed in this region, and the inner region of the absorber 4 It is possible not to reach the limit. Moreover, since the adhesive is not provided, the state of deformation (vertical wrinkles) due to re-adhesion after deformation is not restricted. Furthermore, in this example, the case where the present invention is applied to an absorbent article that does not have a three-dimensional gather is described. However, when the present invention is applied to an absorbent article that has a three-dimensional gather, the side portion that is not adhered to the undergarment. By providing the region K, the side region K corresponding to the standing portion of the three-dimensional gather can be easily deformed to the body side, and the standing effect is enhanced, so that the side leakage preventing effect is improved. The section length of the crotch region 11 is substantially the same as the side edge section (side edge length along the substantially longitudinal direction of the absorbent article) of the absorbent medium-high section 6 as shown in FIG. Is desirable.
[0028]
On the other hand, the absorber middle region 6 or the absorber region sandwiched between the side fit embosses 7 and 7 can be prevented from being misaligned by adhering to the underwear, and intense physical exercise Even when the absorbent body is subjected to excessive compressive force or twisting, the absorbent body 4 is restored to the original state as the shorts are restored to the original state, and vertical wrinkles are eliminated. Therefore, leakage is effectively prevented.
[0029]
Next, since the front and rear end regions 13A and 13B are portions that are not subjected to a large compressive force or torsion even by physical movement, almost the entire width of the absorbent body 4 is adhered to the underwear, and the entire absorbent article 1 is Restrain it so that it is not misaligned. Specifically, the end positions of the pressure-sensitive adhesive patterns 16, 16... Are located at a position of ± 5 mm from the absorbent side edge in the short direction of the absorbent article. The width of the pressure-sensitive adhesive pattern 16 formed in the front and rear end regions 13A and 13B is larger than the width of the pressure-sensitive adhesive patterns 14 and 15 in the crotch region 11 and the intermediate regions 12A and 12B in order to increase the adhesive force. It is desirable to form thicker. Moreover, you may make it use what increased the adhesive force of adhesive itself rather than the adhesive of another site | part.
[0030]
On the other hand, the intermediate regions 12A and 12B have an intermediate function between the crotch region 11 and the front and rear end regions 13A and 13B. That is, with respect to the side region K of the absorbent body 4, by not providing the adhesive layer, the deformation of the absorbent body 4 is allowed to some extent, and the adhesive patterns 15, 15. The length in the short direction is lengthened to prevent displacement of the absorbent article 1. Thus, by arranging the adhesive patterns having different lengths in the short direction so as to gradually increase the length in the short direction from the crotch region 11 to the front and rear end regions 13A and 13B, each adhesive pattern The longitudinal outline connecting the end portions of the two becomes a substantially arc-shaped curve, and the adhesive force to the underwear gradually increases as the arc-shaped curve expands, which is preferable.
[0031]
As the adhesive forming the adhesive layers 14 to 16, an adhesive whose main component is any one of a styrene polymer, a tackifier, and a plasticizer is used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butadiene-styrene block copolymers, and styrene-isobutylene-styrene copolymers, but only one of these is used. Or two or more polymer blends may be used. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. Further, as the tackifier and the plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resin, C9 petroleum resin, dicyclopentadiene petroleum resin, and rosin. Examples of the plasticizer include petroleum resin, polyterpene resin, terpene phenol resin, and the like. In addition to monomer plasticizers such as trifresyl phosphate, dibutyl phthalate and dioctyl phthalate, polymer plasticizers such as vinyl polymers and polyesters. Is mentioned.
[0032]
By the way, the pressure-sensitive adhesive pattern 10 can be variously changed under the limiting conditions for pattern formation according to the present invention. FIG. 3 shows an example of the embodiment. In the example of the adhesive pattern, the section distance of the crotch region 11 is made shorter than that of the embodiment shown in FIG. 2 and the section distance of the rear side region 13B is made longer. is there. Moreover, the example of the mode of the adhesive pattern shown by FIG. 4 makes the section distance of the crotch part area | region 11, intermediate | middle area | regions 12A and 12B, and front-and-back end area | regions 13A and 13B substantially equal, and the longitudinal direction of the absorbent article 1 In this example, the absorbent article 1 is formed symmetrically with respect to the front-rear direction center line and the left-right direction center line. Furthermore, the pressure-sensitive adhesive pattern shown in FIG. 5 is an example in which only the pressure-sensitive adhesive layer closer to the front and rear end sides is formed with a thick width in the crotch region 11, the intermediate regions 12A and 12B, and the front and rear end regions 13A and 13B. .
[0033]
By the way, when packaging the absorbent article 1, a release treatment is performed on one side, and an individual sheet larger than the outer shape of the absorbent article 1 is used, and the release treatment surface is attached to the pressure-sensitive adhesive layer 10. After wearing and folding it in half, heat seal both sides.
[0034]
【The invention's effect】
As described above in detail, according to the present invention, in the absorbent article in which the adhesive slip preventing means is formed on the non-use surface side (outer surface), the formation pattern of the adhesive slip preventing means is appropriately specified for each part. Accordingly, it is possible to effectively prevent the positional shift of the entire absorbent article and to effectively prevent the positional shift of the absorbent body part that contributes to absorption and the occurrence of vertical wrinkles, particularly in the crotch region.
[Brief description of the drawings]
FIG. 1 is a partially broken development view of an absorbent article 1 according to the present invention.
FIG. 2 is a rear view thereof.
FIG. 3 is a back view (No. 1) of an absorbent article showing another pressure-sensitive adhesive pattern.
FIG. 4 is a rear view (No. 2) of an absorbent article showing another pressure-sensitive adhesive pattern.
FIG. 5 is a rear view (No. 3) of an absorbent article showing another pressure-sensitive adhesive pattern.
FIG. 6 is a rear view showing an adhesive pattern in a conventional absorbent article.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Side sheet, 6 ... Absorber middle high part, 7 ... Side part embossing, 8 ... Around Fit emboss, 10 ... adhesive layer, 11 ... crotch region, 12A / 12B ... intermediate region, 13A / 13B ... front and rear end region, 14-16 ... adhesive pattern

Claims (4)

An absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, an adhesive misalignment preventing means is formed on the underwear contact surface side, and the absorber middle-high portion is formed on the surface of the absorbent body. And / or in an absorbent article in which left and right paired side fit embosses are formed on both sides of the absorbent body,
The adhesive misalignment stopping means has at least two or more patterns having different lengths in the short direction of the absorbent article, and has a relatively short length in the short direction in at least the crotch region of the absorbent article. A slip-off stop pattern is disposed, and an adhesive slip-off stop pattern having a relatively short lateral length is disposed at least in the front and rear end region of the absorbent article,
And in the crotch region, the position of the side edge of the adhesive anti-slip pattern is from the innermost side of the side edge of the absorber middle-high part or the pair of left and right side side fitting embosses in the short direction of the absorbent article. An absorbent article characterized by being present at a position of ± 5 mm. 2. The absorbent article according to claim 1, wherein in the front and rear end region, the position of the side end portion of the adhesive slip prevention pattern is located at a position of ± 5 mm from the side edge of the absorbent body in the lateral direction of the absorbent article. The adhesive misalignment pattern has three or more patterns with different lengths in the width direction of the absorbent article, and the length in the width direction is gradually increased from the crotch region to the front and rear end regions. The absorbent article according to any one of claims 1 and 2. The absorbent article according to any one of claims 1 to 3, wherein the adhesive slip prevention means is a pressure-sensitive adhesive, a pressure-sensitive adhesive tape, or a hook-and-loop fastener.

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