JP2012010883A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which improves wearing properties by firmly fixing a deviation preventing adhesive layer on shorts and by preventing the deviation or the twist during the wearing and improves operability by eliminating the waste of the material and by preventing a release paper from being peeled or wrinkled during machine conveyance in the manufacturing process of the absorbent article.SOLUTION: In the absorbent article 1 having an absorber 4 interposed between a liquid-permeable surface sheet 3 and a liquid-impermeable back side sheet 2 and the deviation preventing adhesive layer 8 which is formed on a side of a surface where underwear abuts and is covered with a peeling material 9, the deviation preventing adhesive layer 8 is covered with a piece of the peeling material 9 and is formed over the entire region of the peeling material 9. The deviation preventing adhesive layer 8 has a convex part 8a on a front end side 8A of the absorbent article 1 and a concave part 8b on a rear end side 8B of the absorbent article 1 in a planar view, and shapes of the convex part 8a and the concave part 8b are configured to match each other.

Description

  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.

  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.

  In this type of absorbent article, as shown in FIGS. 9 and 10, in order to prevent misalignment during mounting, the pressure-sensitive adhesive layer 60 is provided on the non-use surface side (the outer surface of the liquid-impermeable back sheet). The pressure-sensitive adhesive layer 60 is adhered to the shorts when the absorbent article is mounted so as to prevent the absorbent article from being displaced.

  Various forms are adopted as the formation pattern of the anti-slipping adhesive layer 60, and one or a plurality of adhesive layers are formed in a line along the longitudinal direction of the absorbent article as shown in FIG. Or a rectangular area having a plurality of areas formed over a plurality of regions, or having a number of pressure-sensitive adhesive layers formed in a line along the short direction of the absorbent article as shown in FIG. Is mentioned. Among these pressure-sensitive adhesive layer pattern groups, the formation pattern for forming a number of pressure-sensitive adhesive layers in a line shape along the short direction of the latter absorbent article shown in FIG. In addition, this is a formation pattern often found in absorbent articles, such as effectively preventing misalignment of the entire absorbent article by appropriately defining the formation pattern of the anti-slip adhesive layer for each part.

JP 2003-10245 A

  However, since the formation pattern of the adhesive layer for preventing slippage as described above is formed in plural in a line shape or a rectangular shape at intervals in the short side and / or long side of the absorbent article, it is attached. The slippage-preventing adhesive layer peels off from the shorts due to the movement of the legs during walking, etc., causing a shift from the initial mounting position, narrowing the absorption surface, and causing the slip-prevention adhesive layers to stick together . Such misalignment or twisting of the absorbent article is particularly noticeable when a napkin or liner that does not have a wing-like flap that is fixed by winding the crotch part of the shorts on both sides of the absorbent article is attached to the shorts. Prone to occur.

  On the other hand, providing the adhesive layer for preventing slippage on the absorbent article is performed by applying the adhesive to the release material and then transferring it to the back sheet. Here, in the case of a conventional absorbent article, as the release material 61, as shown in FIGS. 9 and 10, respectively, in the longitudinal direction and the short direction of the absorbent article from the formation region of the adhesive layer for preventing slippage, respectively. Generally, it is formed to be one size larger.

  However, the outer peripheral portion of the release material 61 extending outward from the formation region of the anti-slipping adhesive layer 60 does not have any special function and causes waste of materials, and manufacture of absorbent articles. It was a cause of turning and wrinkling during machine transportation in the process.

  Therefore, the main problem of the present invention is to improve the wearability by being firmly fixed to the shorts and preventing displacement and twisting during wearing. Another object of the present invention is to provide an absorbent article with improved operability by eliminating waste of materials and making it difficult to turn up or wrinkle release paper during machine conveyance in the manufacturing process of the absorbent article.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorber is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and the underwear contact surface side is prevented from slipping. In the absorbent article in which the pressure-sensitive adhesive layer is formed and the slip-resistant pressure-sensitive adhesive layer is covered with the release material,
The anti-slip adhesive layer is covered with a single release material, and is formed over the entire area of the release material, thereby providing an absorbent article.

  In the first aspect of the present invention, the anti-displacement pressure-sensitive adhesive layer is covered with one release material and formed over the entire area of the release material. Therefore, since a sufficient area of the adhesive layer can be secured, the adhesive layer for preventing misalignment may be peeled off from the shorts due to the movement of the legs such as walking during wearing, causing deviation from the initial mounting position or absorption. It becomes possible to prevent the surface from being narrowed and the adhesive layers for preventing misalignment from sticking to each other. In addition, since there is no release material portion protruding outward from the outer edge of the anti-slipping adhesive layer, the release paper is not turned up or wrinkled during machine conveyance in the manufacturing process, and the operation becomes stable.

  As the present invention according to claim 2, the anti-slipping adhesive layer has a convex part on the front end side of the absorbent article and a concave part on the rear end side of the absorbent article in plan view, The absorbent article according to claim 1, wherein the shape of the convex portion and the concave portion is matched.

  The invention of claim 2 relates to the shape of the anti-slipping adhesive layer, wherein a convex portion is formed on the front end side of the absorbent article in a plan view, and a concave portion is formed on the rear end side of the absorbent article, and The shape of the convex part and the concave part is matched. When forming the anti-slip adhesive layer over the entire area of the release material, for example, in a rectangular shape, the unsealing property when peeling the release material is deteriorated, or the detachability when removing from the shorts is reduced, In particular, there is a concern that the pressure-sensitive adhesives stick to each other on the rear side, or that the adhesiveness to the valleys of the buttock is deteriorated.

  Therefore, if a convex part is formed on the front end side of the thread-stopping adhesive layer and peeling is performed from the front end side having a small adhesive area, the peelability is improved. The detachability at the time of detaching from can be improved. Moreover, by forming the concave portion on the rear end side, it is possible to prevent the adhesives from sticking to each other and to easily adhere the central adhesive non-formation region to the valley of the buttock.

  In addition, by aligning the shape of the convex portion and the concave portion, in the production line, after the adhesive is applied to the entire surface of the release material continuous in the line direction to be conveyed, the convex portion shape (= concave portion shape) If the cross section is cut in the transverse direction, the shape of the individual release material can be obtained, and the production efficiency can be improved, and the waste of the release material can be eliminated.

  As the present invention according to claim 3, the convex portion on the front end side of the anti-slipping adhesive layer is formed in a shape in which the width gradually decreases from both lateral sides of the absorbent article toward the tip side, The absorbent article according to claim 2, wherein the recess on the rear end side is formed in a shape in which the width of the non-formed portion of the non-displaceable adhesive layer gradually increases from the center in the short side direction toward the rear side. The

  The invention described in claim 3 defines a preferred shape example of the anti-slipping adhesive layer. Specifically, the convex portion on the front end side of the anti-slipping adhesive layer is formed in a shape in which the width gradually decreases from both lateral sides of the absorbent article toward the front end side, and the concave portion on the rear end side Is preferably formed in a shape in which the width of the non-formed portion of the anti-displacement adhesive layer gradually increases from the center in the short direction toward the rear side, because the above-described effects are easily exhibited.

  As the present invention according to claim 4, the rear portion of the absorbent body is a region other than the region where the anti-slip adhesive layer is formed, and along the longitudinal direction at the central portion in the short direction of the absorbent article, The absorbent article in any one of Claims 1-3 to which the longitudinally long embossing is provided from the back surface side is provided.

  The invention according to claim 4 is a region other than a region where the anti-slip adhesive layer is formed in the rear portion of the absorbent body, and is located on the back side along the longitudinal direction in the center portion in the short direction of the absorbent article. A vertical emboss is added. By using the vertically long emboss as a bending line, both sides are bent in a mountain fold shape, so that it becomes easy to closely contact the valley of the buttock.

  As the present invention according to claim 5, the region of the anti-slip adhesive layer is divided into three regions in the short direction of the absorbent article, and is applied to both side regions in the short direction of the absorbent article. The absorbent article in any one of Claims 1-4 by which the adhesive force of an adhesive is set weaker than the adhesive force of the adhesive applied to a transversal direction center part is provided.

  The invention according to claim 5 proposes a measure for preventing adhesion between the anti-slipping adhesives. Specifically, the region of the anti-slip adhesive layer is divided into three regions in the lateral direction of the absorbent article. Each region is continuous in the longitudinal direction of the absorbent article. And it sets so that the adhesive force of the adhesive apply | coated to the transversal direction both-sides area | region of an absorbent article may become weaker than the adhesive force of the adhesive applied to a transversal direction center part. Therefore, the adhesive layer in the center with relatively strong adhesive strength is firmly fixed to the shorts, and the adhesive layers on both sides are relatively weakened to prevent adhesion between the adhesive layers. Will come to be.

  According to a sixth aspect of the present invention, the absorbent article is individually packaged by a single sheet in a single package state, and the single sheet and the front end portion of the release material are fixed so as not to be peeled off. The absorbent article as described in any one of -3 is provided.

  The invention according to claim 6 is a one-step opening in which the release material can be peeled off simultaneously when the individual packaging sheet is peeled off when opening the individual absorbent article. Is fixed so as not to be peeled off, so that the peeling material is peeled off from the front end side having a small area of the pressure-sensitive adhesive, so that the unsealing property can be improved.

  As described above in detail, according to the present invention, it is firmly fixed to the shorts, and it becomes possible to improve the wearability by preventing the shift and the twist during the wear. Further, waste of materials can be eliminated, and it is possible to improve operability by making it difficult for the release paper to be turned over and wrinkled during machine conveyance in the manufacturing process of the absorbent article.

It is a partially broken developed view of the absorbent article 1 according to the present invention. FIG. It is a conveyance state figure of the peeling material 9 in a manufacturing process. It is a deformation | transformation figure of the formation pattern of the slip prevention adhesive layer 8. FIG. It is a development view (back side) of individual packaging absorbent article 1 '. It is a perspective view of individual packaging absorbent article 1 '. It is a napkin back view which shows the other example (the 1) of the formation pattern of the slip prevention adhesive layer 8. FIG. It is a napkin back view which shows the other example (the 2) of the formation pattern of the slip prevention adhesive layer 8. FIG. It is a napkin back view which shows the example of a pattern of the conventional slip prevention adhesive layer 60 (the 1). It is a napkin reverse view which shows the example of a pattern of the conventional slip prevention adhesive layer 60 (the 2).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Structural example of absorbent article]
Absorbent article 1 is a body-worn product that absorbs and holds bodily fluids discharged from the body such as panty liners, sanitary napkins, vaginal discharge sheets, and incontinence pads. Specifically, as shown in FIG. An absorbent body 4 is interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3. Further, side sheets 5 and 5 are provided on both sides of the absorbent article 1. In the illustrated example, fit embosses 7, 7... Are formed from the surface side of the liquid-permeable surface sheet 3 in order to prevent side leakage or the like. Further, as shown in FIG. 2, an anti-slip adhesive layer 8 is formed on the underwear contact surface side (back side) of the absorbent article 1, and this anti-slip adhesive layer 8 is covered with a release material 9. It has been broken.

  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.

  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.

  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 dissolved 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.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

[About the adhesive layer 8 for preventing misalignment]
As shown in FIG. 2, the anti-displacement pressure-sensitive adhesive layer 8 is covered with a single release material 9 and is formed over the entire area of the release material 9. That is, at the time of manufacture, the release material 9 having the entire surface on which the anti-slipping adhesive layer 8 is applied is adhered to the back sheet 2 of the absorbent article 1, and the anti-slipping adhesive layer 8 is transferred.

  As the pressure-sensitive adhesive forming the anti-displacement pressure-sensitive adhesive layer 8, for example, a styrene polymer, a tackifier, or a plasticizer, which is a main component, is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  As shown in FIG. 2, the anti-displacement adhesive layer 8 has a convex portion 8a on the front end side 8A of the absorbent article 1 and a rear end side 8B of the absorbent article 1 in a plan view. A recess 8b is provided. In addition, the shapes of the convex portions 8a and the concave portions 8b are matched. The area of the anti-slip adhesive layer 8 is 50 to 80%, preferably about 60 to 80% with respect to the total area of the back sheet 2.

  The convex portion 8a on the front end side 8A of the anti-slipping adhesive layer 8 is formed in a shape in which the width gradually decreases from both lateral sides of the absorbent article toward the front end side, and the concave portion on the rear end side 8B. 8b is desirably formed in a shape in which the width of the non-formed portion of the non-displaceable adhesive layer 8 gradually increases from the center in the short direction toward the rear side. In the example of FIG. 2, the convex portion 8a on the front end side 8A has a mountain shape composed of a pair of left and right oblique sides, and the concave portion 8b on the rear end side 8B similarly has a mountain shape composed of a pair of oblique sides. It is desirable that the vertex angle of the convex portion 8a and the concave portion 8b is in a range of 90 to 120 °.

  If the protrusion 8a is formed on the front end side 8A and the release material 9 is peeled off from the front end side 8A having a small adhesive area, the peelability is improved. The detachability when removing can be improved. Further, by forming the recess 8b on the rear end side 8B, it is possible to prevent the adhesives from sticking to each other and to make the central adhesive non-formation region easily adhere to the valley of the buttocks.

  Further, since the shape of the convex portion 8a on the front end side 8A and the shape of the concave portion 8b on the rear end side 8B are aligned with each other, as shown in FIG. 9 is applied to the entire surface, and then cut in the transverse direction with the shape of the convex portion 8a (= the shape of the concave portion 8b), the shape of the individual release material 9 can be obtained, and the manufacturing efficiency can be improved and the peeling can be performed. The waste of the material 9 can be eliminated.

  As the pressure-sensitive adhesive layer 8, the pressure-sensitive adhesive layer 8 may be of one type and may be applied with the same adhesive force over the entire surface. However, as shown in FIG. 4, the adhesive force is changed for each region. It is also possible to do so. Specifically, the region of the anti-slipping adhesive layer 8 is divided into three regions in the short direction of the absorbent article 1. The absorbent article 1 is continuous in the longitudinal direction. And it sets so that the adhesive force of the adhesive apply | coated to the transversal direction both-sides area | regions 8d and 8d of the absorbent article 1 may become weaker than the adhesive force of the adhesive applied to the transversal center part 8c. . The pressure-sensitive adhesive layer 8c in the central portion having a relatively strong adhesive force is firmly fixed to the shorts, and the pressure-sensitive adhesive layers on both side portions 8d and 8d are relatively weakened so that the pressure-sensitive adhesive layers It becomes possible to prevent adhesion.

  Further, as shown in FIG. 2, the rear portion of the absorbent body 4 is a region other than the region where the anti-slip adhesive layer 8 is formed, and is long in the center in the short direction of the absorbent article 1. It is desirable to provide the vertically long emboss 10 from the back side along the direction. When the vertical emboss 10 is drawn on a rear end side 8B of a virtual line L1 connecting both ends of the anti-displacement adhesive layer 8, the front side of the vertical emboss 10 is positioned on the front side of the virtual line L1. However, it is preferable that the rear side of the vertically long emboss 10 is provided so as to be positioned behind the virtual line L1. In the illustrated example, the planar shape of the vertically long emboss 10 is an elongated triangular shape with the apex directed to the front side, but may be an elongated rectangular shape. The vertically long emboss 10 is applied from the back surface side, and the vertical emboss 10 is used as a bending line, and both sides are easily bent in a mountain fold shape, so that the absorbent body 4 is easily adhered to the valley of the buttocks.

  When the absorbent article 1 is individually packaged, as shown in FIG. 6, the packaging sheet 11 is laminated on the outer surface side of the release paper 9, and then folded in the longitudinal direction to form both side portions 11 a and 11 a of the packaging sheet 11. The opening end 11b is sealed with the tag tape 12. However, in order to use the one-step opening method, the release paper 9 and the packaging sheet 11 are fixed so as not to be peeled, and the packaging sheet 11 and the release paper 9 are peeled off. In this case, as shown in FIG. 5, the release sheet 9 is peeled off together with the packaging sheet 11 if the individual sheet 11 and the front end portion of the release material 9 (a region of reference numeral 13) are fixed so as not to be peeled off. At this time, the release paper 9 can be smoothly peeled from the front end side having a weak adhesive force.

  By the way, as described above, the planar shape of the anti-displacement adhesive layer 8 is, for example, as shown in FIG. As shown in the drawing, a rectangular convex portion 8a may be formed on the front end side 8A, and a rectangular concave portion 8b may be formed on the rear end side 8B. Alternatively, as shown in FIG. An arc-shaped convex portion 8a may be formed on the rear end side, and an arc-shaped concave portion 8b may be formed on the rear end side 8B.

[Other examples]
(1) The present invention is preferably applied to a napkin, a liner, or the like that does not have a wing-shaped flap, but of course can also be applied to an absorbent article having a wing-shaped flap.

  DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Side sheet, 7 ... Fit embossing, 8 ... Anti-slip adhesive layer, 8a ... Projection , 8b ... concave portion, 9 ... release material, 10 ... longitudinally embossed, 11 ... packaging sheet, 12 ... tag tape

Claims (6)

An absorber is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and an anti-slip adhesive layer is formed on the underwear contact surface side. The anti-slip adhesive layer is a release material. In absorbent articles covered by
The absorbent article, wherein the anti-displacement pressure-sensitive adhesive layer is covered with a single release material and is formed over the entire area of the release material.   The anti-slipping adhesive layer has a convex portion on the front end side of the absorbent article and a concave portion on the rear end side of the absorbent article in a plan view, and the shape of the convex portion and the concave portion is matched. The absorbent article according to claim 1.   The convex portion on the front end side of the anti-slipping adhesive layer is formed in a shape in which the width gradually decreases from both lateral sides of the absorbent article toward the front end side, and the concave portion on the rear end side is short. The absorbent article of Claim 2 currently formed in the shape where the width | variety of the non-formation part of a slip prevention adhesive layer is expanded gradually toward the back side from a direction center part.   The rear part of the absorbent body is a region other than the region where the anti-slipping adhesive layer is formed, and is provided with a longitudinally long emboss from the back side along the longitudinal direction at the central portion in the short direction of the absorbent article. The absorbent article according to any one of claims 1 to 3.   The region of the anti-slip adhesive layer is divided into three regions in the short direction of the absorbent article, and the adhesive force of the adhesive applied to both side regions in the short direction of the absorbent article is short. The absorbent article in any one of Claims 1-4 set weaker than the adhesive force of the adhesive apply | coated to a direction center part.   The absorbent article according to any one of claims 2 to 3, wherein the absorbent article is individually packaged in an individually packaged state, and the individual sheet and the front end of the release material are fixed to each other so as not to be peeled off. Goods.

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