JP5059899B2 - Method for manufacturing absorbent article - Google Patents

Description

The present invention relates to a method for manufacturing an absorbent article having a wing-shaped flap that is used so as to be wound around a crotch portion of an underwear when being fixed to the underwear.

  Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, for example, as shown in FIG. 10, a liquid-impermeable back sheet 50 made of a polyethylene sheet or a polyethylene laminated nonwoven fabric, for example. And an absorbent body 52 made of cotton-like pulp or the like is known between a non-woven fabric or a liquid-permeable surface sheet 51 made of a porous plastic sheet.

  As this type of absorbent article N, in order to prevent misalignment in the mounted state, for example, one or a plurality of adhesive layers 53, 53 are formed on the non-skin contact surface side (outer surface), and the napkin body The wing-shaped flaps W, W extending outward are integrally formed on both sides in the longitudinal direction of the wing, and the wing-shaped flaps W, W are adhered to a surface (outer surface) on the liquid-impervious back sheet 50 side. There are those in which the agent layers 54 and 54 are provided (see Patent Documents 1 and 2 below).

  In order to fix the absorbent article N to the undergarment 60, as shown in FIG. 11, the absorbent article N is applied to a locally corresponding portion of the undergarment 60, and the wing-shaped flaps W, W projecting sideways are put on the undergarment. The outer wing flaps W and W are folded back at the wrapping lines RL and RL and bonded to the outer surface of the crotch portion of the underwear 60 so that the crotch portion of the underwear is wrapped, and then the underwear is worn on the body. I have to.

JP 2003-111799 A JP 2004-113590 A

Accordingly, the main problem of the present invention is to enable efficient production of a large number of absorbent articles with wing-like flaps that are used by being wound around the crotch portion of the underwear when being fixed to the underwear. is there.

In order to solve the above-mentioned problem, as the present invention according to claim 1, underwear is attached to each side of the main body portion where the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet. A method for manufacturing an absorbent article in which a wing-shaped flap that is fixed so as to involve a crotch portion is formed,
The wing-shaped flap has a front outline extending outward from the main body portion and a rear outline extending outward from the main body portion,
The angle formed by the width direction line of the absorbent article and the rear side outline is set larger than the angle formed by the width direction line of the absorbent article and the front side outline, and the center of gravity of the wing-shaped flap is set. Is biased to the front side from the center of the joint line between the base of the wing-shaped flap and the main body part, and the front side outline and the rear side outline are wavy lines made of a combination of a convex curve and a concave curve ,
In manufacturing the absorbent article, a transverse flow method in which the longitudinal axis of the absorbent article is orthogonal to the production line, and the normal arrangement and the reverse arrangement in which the top and bottom are reversed are alternately arranged,
The rear outer shape of the wing-shaped flaps of the absorbent article of the normal arrangement and the absorbent article of the reverse arrangement, under the condition that the absorbent body is not aligned to the right and left with respect to the production line direction and is on the same straight line. The manufacturing method of the absorbent article characterized by determining the outline of a wing-shaped flap so that lines may correspond completely .

As described in detail above , a large number of absorbent articles having wing-shaped flaps can be efficiently manufactured with a small amount of materials.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. FIG. It is the III-III arrow directional view of FIG. It is a principal part enlarged plan view of a wing-shaped flap. (A) is a case of a conventional wing-shaped flap, and (B) is a case of a wing-shaped flap according to the present invention. The action force mechanism when the wing-shaped flap is folded back is shown. (A) is the case of the conventional wing-shaped flap, and (B) is the case of the wing-shaped flap according to the present invention. It is a schematic diagram (A) (B) which shows the plane shape of the wing-shaped flap which concerns on this invention. It is a top view which shows the modification of the sanitary napkin which concerns on this invention. It is a flow state figure of the napkin which shows the manufacture point of the sanitary napkin 1 concerning the present invention. It is an expanded view of the conventional sanitary napkin N. FIG.

  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 a sanitary napkin 1 according to the present invention, FIG. 2 is a rear view thereof, and is a view taken along the line III-III of FIG.

《Sanitary napkin 1》
The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable front sheet 3 that allows permeation of menstrual blood, cages, and the like, and a space between the two sheets 2 and 3. An absorbent body 4 made of cotton-like pulp or synthetic pulp intervening, a crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility, and the liquid-permeable surface sheet 3 and a second sheet 6 made of a hydrophilic non-woven fabric interposed between the crepe paper 5 and side non-woven fabrics 7 and 7 respectively formed on both sides of the surface along the longitudinal direction. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal. Has been.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, 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 nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  As the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. In addition, it is desirable to prevent side leakage by applying various embosses from the upper surface side of the liquid-permeable surface sheet 3 to promote retention of bodily fluids and increase absorption efficiency.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, 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. When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like.

  The second sheet 6 made of a hydrophilic non-woven fabric interposed between the liquid-permeable surface sheet 3 and the crepe paper 5 is made of, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene, and rayon. Can be made of natural fibers such as spunlace, spunbond, thermal bond, melt blown, needle punch, etc. Can do. In order to impart hydrophilicity, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, or treatment with a metal salt such as stannic chloride, Synthetic fibers can be made to swell or become porous by a method such as partially dissolving the surface to make it porous and depositing metal hydroxide, etc., and applying capillary action to impart hydrophilicity. The second sheet 6 is most preferably used in a combination in which the liquid-permeable surface sheet 3 is a porous plastic sheet.

  On the other hand, side non-woven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W, W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways. The wing-shaped flap W will be described in detail later.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic The hydrophilic treatment nonwoven fabric which gave is used.

  As shown in FIG. 2, the non-skin contact surface of the main body part in which the absorbent body 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 is for fixing to the underwear. Are formed in a plurality of strips according to an appropriate coating pattern, and in the illustrated example, three main body anti-slipping adhesive layers 8, 8... Are formed, and these main body anti-slipping adhesive layers 8, 8. Covered with wood. Further, a wings prevention adhesive layer 9 is formed on the surface of the wing-shaped flaps W, W on the liquid-impermeable back sheet 2 side, and the wings prevention adhesive layers 9, 9 are not shown. Covered with a release material. Preferably, the release material is formed by joining the release material for the main body and the release material for wings arranged in the transverse direction at an intersection so that the release material can be removed with a single peeling operation. W and W may be so-called belly folds that fold to the liquid-permeable topsheet 3 side in the individual packaging state, or may be so-called back folds that fold to the liquid-impermeable backsheet 2 side. Moreover, you may make it isolate | separate into right and left instead of one peeling material as a peeling material which covers the wings prevention adhesive layer 9 and 9. FIG.

  As the release material, for example, a release treatment liquid such as a silicone resin, a fluorine resin, or a tetrafluoroethylene resin is applied to the contact surfaces with respect to the anti-displacement adhesive layers 8 and 9, or spray coating is performed. A release-treated paper or plastic sheet can be used.

  As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layers 8 and 9, for example, a styrenic polymer, a tackifier, or a plasticizer that 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.

《Wing flap W》
As shown in detail in FIG. 4, the wing-shaped flap W includes a front outline 10 extending outward from the main body portion, a rear outline 11 extending outward from the main portion, and the front outline 10. And an outer shape composed of a front end side outline 12 connecting the rear outline 11. In the sanitary napkin 1, the shape of the wing-shaped flap W is set so that the width direction line of the sanitary napkin 1 and the rear side are larger than the angle θ formed by the width direction line of the sanitary napkin 1 and the front outer shape line 10. The angle β formed with the outer shape line 11 is set larger, and the center of gravity 13 of the wing-shaped flap W is biased forward by ΔS from the center point 14 of the joint line 15 between the base of the wing-shaped flap W and the main body portion. I am doing so. In addition, if the shape which satisfy | fills the said conditions is shown typically, it will become the substantially triangular shape shown by FIG. 7 (A), or the substantially unequal-legged trapezoid shape shown by FIG. When the shape is a substantially triangular shape, the front end side outline 12 that connects the front outline 10 and the rear outline 11 does not exist. Further, the front appearance line 10, the rear outline line 11, and the distal outline line 12 do not have to be straight lines, and may be wavy lines, curves, or combinations thereof. In this case, the angles θ and β only need to have a gradient formed by the center line of these wavy or curved outlines.

  An angle θ formed between the width direction line of the sanitary napkin 1 and the front outer shape line 10 is set to about 0 to 15 °, and an angle β formed between the width direction line of the sanitary napkin 1 and the rear outer shape line 11. Is preferably about 30 to 50 °. In this case, the angle θ formed by the width direction line of the sanitary napkin 1 and the front side outline 10, the width direction line of the sanitary napkin 1 and the rear side The angle difference with the angle β formed with the outline 11 is preferably 30 ° or more. When this angle difference is 30 ° or more, a sufficient eccentric distance ΔS can be secured, and when the wing-shaped flap W is folded, the wing-shaped flap is folded by hand while moving the hand forward as described later. However, it will be able to be worn in the correct state.

  By making the wing-shaped flap W into the outer shape as described above, the wing-shaped flap can be easily folded back and adhered properly at the regular folding position without causing problems such as adhesion between adhesives or erroneous adhesion. It is possible to bring advantages such as. This point will be further described in detail by comparison with a conventional isosceles trapezoidal wing-shaped flap W (see FIG. 10).

  First, when the sanitary napkin 1 is attached to the shorts 20 while a woman is sitting on a toilet bowl or the like, the shorts 20 is lowered and lowered, so that the napkin 1 is located in front of the body as shown in FIG. Will be installed.

  In the case of a conventional isosceles trapezoidal wing-shaped flap W, as shown in FIG. 5 (A), a structure that cannot be mounted successfully unless the wing-shaped flap is folded back from the state where hands are attached to both sides of the napkin. It has become. However, because the wearing position is on the front side of the body, if you are not careful, you will have to move your hand to the front side (Fig. 5 (B)), and only a part of the wing-shaped flap will be folded. Adhesives are bonded to each other and wrinkles and bulges are formed, and there are problems such as erroneous adhesion in which the wing-shaped flap W is folded back and bonded to the adhesive layer. In addition, the folding line of the wing-shaped flap may be bent at an angle. Therefore, in the present invention, as shown in FIG. 5 (B), when the wing-shaped flap W is folded, even if the wing-shaped flap is folded by hand while moving the hand to the front side, it is exactly legitimate. It is a wing shape that can be mounted in a state.

  Fig. 6 (A) shows the working force mechanism when folding back a conventional isosceles trapezoidal wing-shaped flap W. When the wing-shaped flap is folded by hand while moving the hand forward. Suppose that a load acting downward from the rear outline of the wing-shaped flap W to the tip side acts, and assuming a concentrated load ΣP that summarizes these distributed loads, the base point of the moment generated by this concentrated load ΣP is It becomes the center point 14 of the joint line 15 of the wing-shaped flap, and twisting occurs when the wing-shaped flap W is folded back, and the fold line 16 gradually progressing from the base end of the rear outline 11 is inclined outward. become.

  On the other hand, in the case of the present invention, as shown in FIG. 6 (B), it is assumed that a downward load acts on the central portion of the inclined rear outline 11 and these distributed loads are summarized. Assuming a concentrated load ΣP, the base point of the moment generated by this concentrated load ΣP is shifted to the front side of the center point 14 of the joint line 15 of the wing-shaped flap 13 ′ (1: 2 division point of the joint line 15). Therefore, since the twist at the time of folding back the wing-shaped flap W is small, the folding line 16 gradually progressing from the proximal end of the rear outline 11 coincides with the joining line 15 and is folded at the regular folding position. Become.

  In addition, since the rear outline 11 of the wing-shaped flap W is greatly inclined, the wrap-shaped line RL can be formed without causing problems such as adhesion between adhesives or erroneous adhesion to the wing-shaped flap W. It will be folded.

  On the other hand, the protruding length L of the wing-shaped flap W is 40 to 50 mm, preferably longer than the crotch width of the shorts 20. By making it longer than the crotch width of the shorts 20, the shorts can be firmly fixed to the shorts.

  On the other hand, as shown in FIG. 2, the wings-stopping adhesive layer 9 provided on the back side of the wing-shaped flap W is such that the longitudinal width of the napkin 1 is narrower at the distal end side SL than at the proximal end side NL. Desirably, it is desirable to have a substantially triangular shape, a substantially isosceles trapezoidal shape, or an unequal legged trapezoid shape. This makes it difficult for the adhesives to be bonded or misbonded when folded.

[Other examples]
(1) As shown in FIG. 8, the tip portion of the wing-shaped flaps W, W is colored 17 so that the tip portion can be visually confirmed, and mounting mistakes can be reduced.
(2) As shown in FIG. 8, the rear outline 11 of the wing-shaped flap W may be a wavy curve formed by a combination of a small convex curve and a concave curve. In this case, it is easy to understand the front and back, and it can be visually emphasized that the rear outline 11 is inclined obliquely.
(3) Since the wing-shaped flap W is made of a material having elasticity in the napkin longitudinal direction and / or the width direction, the wing-shaped flap W follows the movement of the body and relaxes the stress. Becomes better and difficult to shift. Specifically, the side nonwoven fabric 7 is a stretchable side nonwoven fabric, specifically, a nonwoven fabric composed of long fibers made of an elastic resin material that is easily reversibly plastically deformed, such as polyurethane, or stretched. Although the fiber diameter of the fiber itself does not change, a zigzag or spiral crimp is formed, and a non-woven fabric or the like that exhibits stretchability by extending the crimp is used. By using a stretchable plastic film as the liquid back sheet 2, the wing-shaped flaps W and W are stretched to follow the movement of the body.
(4) The sanitary napkin 1 can be manufactured by the longitudinal flow method shown in FIG. 9 (B), but as shown in FIG. If the normal arrangement and the reverse arrangement in which the top and bottom are reversed are arranged alternately, a large number of napkins 1, 1... Can be efficiently manufactured with a small amount of material. In this case, after the wing-shaped flap W of the napkin 1 arranged in the reverse direction and the napkin 1 arranged in the reverse direction under the condition that the absorbent body 4 does not shift to the left and right with respect to the production line direction and is on the same straight line. The outline of the wing-shaped flap W is determined so that the side outlines coincide.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Second sheet, 7 ... Side nonwoven fabric, 8 ... Main body slip prevention adhesive Layer, 9 ... Wings prevention adhesive layer, 10 ... front outline, 11 ... rear outline, 12 ... tip outline, W ... wing-shaped flap

Claims (1)

Wing-like flaps are formed on both sides of the body part where the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet so that the crotch part of the underwear is fixed when worn. A method for manufacturing an absorbent article comprising:
The wing-shaped flap has a front outline extending outward from the main body portion and a rear outline extending outward from the main body portion,
The angle formed by the width direction line of the absorbent article and the rear side outline is set larger than the angle formed by the width direction line of the absorbent article and the front side outline, and the center of gravity of the wing-shaped flap is set. Is biased to the front side from the center of the joint line between the base of the wing-shaped flap and the main body part, and the front side outline and the rear side outline are wavy lines made of a combination of a convex curve and a concave curve ,
In manufacturing the absorbent article, a transverse flow method in which the longitudinal axis of the absorbent article is orthogonal to the production line, and the normal arrangement and the reverse arrangement in which the top and bottom are reversed are alternately arranged,
The rear outer shape of the wing-shaped flaps of the absorbent article of the normal arrangement and the absorbent article of the reverse arrangement, under the condition that the absorbent body is not aligned to the right and left with respect to the production line direction and is on the same straight line. A method for producing an absorbent article, characterized in that an outline of a wing-shaped flap is determined so that the lines completely coincide with each other.

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