JP4869004B2 - Absorbent articles - Google Patents

Description

  The present invention mainly relates to absorbent articles used for sanitary napkins, vaginal sheets, incontinence pads, medical pads, toiletries, etc., even when a large amount of menstrual blood is released due to excessive menstruation, The present invention relates to an absorbent article that surely prevents leakage and is difficult to fit on the body.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet In this case, an absorbent body made of paper cotton such as pulverized pulp is interposed therebetween.

In order to prevent leakage of body fluids and the like, these absorbent articles are provided with various leak prevention means as shown in Patent Documents 1 and 2, for example. Specifically, in Patent Document 1 below, by forming convex curved surface shape portions convex on the skin contact surface side at both end portions in the width direction of the excretion portion contact portion, The curved surface is fitted without creating a gap to provide fit and side leakage prevention. Moreover, in the following Patent Document 2, when using a sanitary napkin, body fluid or the like is provided on the surface of the divided absorbent element by providing the divided absorbent element standing on both the left and right sides with the center line extending in the vertical direction of the absorbent article as a boundary. It can be absorbed not only from the back side.
JP 2001-170111 A JP 2004-89392 A

  However, in the case of a person who causes excessive menstrual symptoms due to uterine fibroids, endometriosis, etc., as a result of investigations by the inventors, a large amount of menstrual blood is released at a time. In the leakage prevention means, it has been clarified that the leakage has occurred beyond that, and in particular, it has been found that leakage from the base portion of the legs accounts for a considerable proportion. Thus, people who have developed excessive menstruation have been using absorbent articles that are larger and more bulky than usual, but the fit to the body is poor, twisting occurs, and sufficient leakage prevention effect Could not be demonstrated.

  Therefore, the main problem of the present invention is to provide an absorbent article that reliably prevents leakage from around the legs, and that fits the body and is difficult to twist, even for people who have developed excessive menstruation and the like. is there.

In order to solve the above-mentioned problem, in the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet as the present invention according to claim 1,
In addition to the absorber body positioned inside the shorts in the mounted state, the absorbent body is exposed to the outside of the shorts and includes a pair of left and right leg absorbers that covers the base portion of the wearer's leg , absorbent article characterized in that prior Symbol absorbent body and easy deformability of the flexible shaft along the panty line as the boundary line between the absorber for around legs are formed is provided.

  According to the first aspect of the present invention, in addition to the main body of the absorber, a pair of left and right leg-side absorbers that are exposed to the outside of the shorts and cover the base portion of the wearer's leg are provided. A leg that covers a base portion of a wearer's leg when in use is formed by forming an easily deformable flexible shaft along the boundary line between the absorbent body corresponding to the line and the absorbent body around the leg. The absorbent body for surroundings can be easily bent and fits without depending on the inner side of the base portion of the leg, thereby reliably preventing leakage of menstrual blood or the like from around the leg. The “shorts line” refers to a line formed by the outer edge of the shorts, and it is desirable that the shorts line, the boundary line between the absorbent body and the absorbent body around the legs are substantially coincident with each other. Since there are individual differences, there may be a slight shift between the shorts line and the boundary line between the absorbent body and the leg absorber in the actual wearing state.

  In the present invention according to claim 2, the absorber main body and the leg-surrounding absorber are respectively independent absorbers, and the flexible shaft has an approximately equal width between the absorber main body and the leg-surrounding absorber. The absorbent article of Claim 1 formed by separating is provided.

  In the present invention according to claim 3, the absorber main body and the leg-surrounding absorber are respectively independent absorbers, and the flexible shaft has a substantially center of the crotch between the absorber main body and the leg-surrounding absorber. The absorbent article according to claim 1, wherein the absorbent article is formed by being separated by a width gradually increasing from the portion toward both ends.

  According to a fourth aspect of the present invention, the absorber body and the leg-surrounding absorber are an integral absorber, and the flexible shaft has a constricted portion formed along the shorts line from the absorber side edge. The absorbent article of Claim 1 currently formed is provided.

  The present invention according to claims 2 to 4 shows the formation modes of the flexible shaft, and the flexible body formed according to each of the modes facilitates the absorption of the leg periphery along the periphery of the leg. It can be bent at the same time, and it can be fitted to the crotch part to prevent leakage from around the legs.

  As this invention which concerns on Claim 5, the said absorber main body and the absorber for leg periphery are made into an integral absorber, and the said flexible shaft squeezes an absorber along a shorts line, or at the time of fiber accumulation The absorbent article according to claim 1, wherein the absorbent article is formed by providing a thin portion along the shorts line.

  In the invention of claim 5, since the flexible shaft is formed by squeezing and thinning the absorber, or by providing a thin portion along the shorts line at the time of fiber pile, the absorber for the leg circumference Easily bends and improves the absorption of body fluids.

  As the present invention according to claim 6, there is provided the absorbent article according to any one of claims 1 to 5, wherein the leg-surrounding absorbent body is formed with a lower basis weight than the absorbent body. In the present invention, since the leg-surrounding absorbent body is formed with a lower basis weight than the absorbent body, the feeling of sticking when worn is reduced.

  As the present invention according to claim 7, there is provided an absorbent article according to any one of claims 1 to 6, wherein embossing is performed to join the liquid-permeable top sheet and the back sheet along the flexible axis. Is done.

  In the invention according to the seventh aspect, since the embossing is performed to join the liquid-permeable topsheet and the backsheet along the flexible axis, the displacement of the leg-surrounding absorber is prevented. At the same time, it is easy to bend along the shorts line. The embossing is preferably performed over the entire width of the separation width at which the absorber body and the leg-surrounding absorber are separated.

  As an aspect of the present invention according to claim 8, an elastic body is provided on the back sheet side of the leg-surrounding absorbent body at a position passing through the leg-surrounding absorbent body in a plan view along a substantially longitudinal direction of the absorbent article. An absorbent article according to any one of claims 1 to 7 is provided. In the invention according to claim 8, an elastic body is provided on the back sheet side of the leg-surrounding absorbent body at a position passing through the leg-surrounding absorbent body in a plan view along the substantially longitudinal direction of the absorbent article. Thus, the leg-surrounding absorber can be brought into close contact with the base of the leg when worn, and followability to the movement of the leg is produced, so that a higher leakage prevention effect can be expected.

  As described above in detail, according to the present invention, even if a person has developed excessive menstruation and the like, it is possible to reliably prevent leakage from around the legs and to provide an absorbent article that fits the body and is difficult to twist. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken perspective view of a sanitary napkin 1 according to the present invention.

  The sanitary napkin 1 is mainly used for applications such as panty liners, sanitary napkins, cage sheets, and incontinence pads. For example, as shown in FIG. , Simply referred to as the back sheet) and the liquid-permeable surface sheet 3 (hereinafter simply referred to as the surface sheet), the absorber 4 or the absorber surrounded by the crepe paper 5 as shown in the figure. 4 has an intervening structure. The back sheet 2 and the top sheet 3 may be joined around the absorbent body 4 by an adhesive means such as a hot melt adhesive. However, the back sheet 2 may be joined from the back side of the absorbent body 4. It is preferable to cover the surface side of the absorbent body 4 with the topsheet 3 after covering in a width direction over a certain region on the topside. A hydrophilic second sheet (not shown) may be disposed between the top sheet 3 and the absorber 4.

  The sanitary napkin 1 is preferably used when excessive menstruation is caused by uterine fibroids, endometriosis, etc., and a large amount of menstrual blood is released at one time. It is formed larger than the napkin for use. Specifically, it is desirable that the length is 300 to 450 mm, preferably 350 to 450 mm, and the width is 100 to 180 mm, preferably 110 to 150 mm.

  The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  As the surface sheet 3, a perforated 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, an air through method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 is preferably made of cotton-like pulp. At this time, it is also possible to use a mixture in which a superabsorbent resin is mixed in cotton pulp, or a mixture in which chemical fibers are mixed in the pulp and a superabsorbent resin is mixed. The shape and the like of the absorber 4 will be described in detail later. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten 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.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is preferably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  As shown in the figure, it is desirable that the absorbent body 4 is surrounded by crepe paper 5 in order to maintain its shape and quickly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed.

  On the non-skin contact surface of the sanitary napkin 1, an anti-displacement adhesive layer (not shown) is formed by an appropriate application pattern for fixing to the underwear. This slippage preventing adhesive layer is applied to the inner side of the boundary line (S1) between the absorbent body 4A and the leg-surrounding absorbent bodies 4B, 4B. The application position can be provided at the front part of the sanitary napkin 1, or at the rear part, or can be provided over the entire length. As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layer, 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.

  Here, general shorts S will be described. 4A and 4B are general shorts S, in which FIG. 4A is a perspective view, and FIG. 4B is a development view cut at both sides thereof. As shown in FIG. 4 (B), the general shorts S has outer shapes S1, S1 (described later) in which the both sides of the crotch portion are notched in a curved shape so as to follow the legs. The crotch portion S2 is formed by a portion corresponding to the crotch portion.

  In the sanitary napkin 1, the absorbent body 4 is exposed to the outside of the shorts lines S1 and S1 in addition to the absorbent body 4A that is positioned inside the shorts in the mounted state, and the base part of the wearer's leg is exposed. A pair of left and right leg-surrounding absorbers 4B and 4B are provided. Further, easily deformable flexible shafts 6 and 6 are formed along the shorts lines S1 and S1 which are boundaries between the absorbent body 4A and the leg-surrounding absorbent bodies 4B and 4B.

  When the sanitary napkin 1 is used, as shown in FIG. 5, the absorbent body 4A is tightened with a shorts S from the outer surface side of the sanitary napkin 1 to cover the inseam of the wearer, The absorbent body 4B protrudes from the crotch portion S2 of the shorts S and is bent by the fastening force of the legs at the flexible shafts 6 and 6 formed along the shorts lines S1 and S1, so as to cover the base portions of the legs, respectively. Become. Since the narrowest width of the crotch part of the shorts S is normally 60 to 100 mm, the narrowest width of the absorbent body 4A is preferably 60 to 100 mm, preferably 70 to 90 mm.

  In the sanitary napkin 1, since the flexible shafts 6 and 6 are provided, the leg-use absorbent bodies 4B and 4B that cover the base portion of the wearer's leg when in use can be easily bent. It fits without depending on the inside of the base portion, and can prevent leakage of menstrual blood and the like from around the legs.

Here, although the said absorber main body 4A and the leg periphery absorber 4B are good also as the same basis weight, it is preferable to form the leg periphery absorber 4B with a lower basis weight than the absorber main body 4A. Specifically, the absorbent body 4A basis weight of 300~1000g / m ^2, preferably 450~750g / m ^2, a basis weight of 200-500 g / m ² of the absorbent body 4B for around legs, preferably 300 to 400 g / m ² is preferable. By forming the leg-surrounding absorbent body 4B with a lower basis weight than that of the absorbent body 4A, it is possible to reduce the feeling of sticking of the crotch portion when worn.

  The flexible shaft 6 can be formed in various ways. For example, as shown in FIG. 2, in the first mode, the absorbent body 4A and the leg-surrounding absorbent bodies 4B and 4B are independent absorbent bodies, and the flexible shafts 6 and 6 are the absorbent bodies. The body main body 4A and the leg-surrounding absorbers 4B and 4B are formed by being spaced apart with substantially equal width. In this aspect, the leg-surrounding absorber 4B is easily bent along the outer shape S1 of the crotch portion S2.

  As a second aspect, as shown in FIG. 6, the absorbent body 4A and the leg-surrounding absorbent bodies 4B and 4B are respectively independent absorbent bodies, and the flexible shafts 6 and 6 are the absorbent body main body. 4A and the leg periphery absorbers 4B and 4B are formed by being separated by a width gradually increasing from the substantially center part of the crotch toward both ends. In this aspect, since the separation width is gradually increased toward both ends of the flexible shaft 6, the leg-surrounding absorbent body 4 </ b> B can be easily bent, and the feeling of sticking when worn can be reduced. .

  As a third aspect, as shown in FIG. 7, the absorbent body 4A and the leg-surrounding absorbent bodies 4B and 4B are formed as an integral absorbent body, and the flexible shafts 6 and 6 are formed from the side edges of the absorbent body. It is formed by having the constricted portions 6a and 6a formed along the shorts line S1. In this embodiment, the leg-surrounding absorbent body 4B is easily bent along the flexible shaft 6, and the absorbent body 4 is continuously interposed in the crotch part. Can be prevented.

  In each of the above aspects, the width direction position portion of the outer edge of the leg-surrounding absorber 4B, 4B is arranged so as to coincide with the outer edge of the absorber body 4A, but as shown in FIG. The leg-surrounding absorbers 4B, 4B may be moved slightly outward and disposed so as to be positioned outside the outer edge of the absorber body 4A. Thereby, while maintaining the area of the leg-surrounding absorber 4B, the separation width between the absorber main body 4A and the leg-surrounding absorber 4B can be increased, and the body can be fitted to the body without feeling uncomfortable while maintaining the absorption performance. It becomes easy. Further, the leg-surrounding absorbent body 4B may be arranged so as to be biased in the longitudinal direction (front-rear direction) of the sanitary napkin 1 in each of the above embodiments. In this case, since the front side (abdomen side) of the human body has a tighter curve, the leg-surrounding absorber 4B is biased to the rear side, that is, arranged to increase the separation width from the absorber body 4A on the front side. This is preferable because it is easier to fit the body.

  Further, as shown in FIG. 9, the flexible shafts 6 and 6 have the absorbent body 4A and the leg-surrounding absorbent bodies 4B and 4B as an integral absorbent body, and the absorbent bodies are disposed along the shorts line S1. It is also possible to form by pressing the recessed portions 4C and 4C. The concave portion 4C can also be formed by stacking. Accordingly, the leg-surrounding absorbers 4B and 4B are easily bent along the flexible shaft 6, and the body fluid is also absorbed by the concave portions 4C and 4C along the flexible shaft 6, thereby improving the absorption performance. In addition, it is possible to prevent the position of the leg-surrounding absorbers 4B and 4B from being displaced, and the absorber 4 is integrated, so that the manufacture and handling are facilitated.

  As shown in FIG. 10, the flexible shaft 6 may be subjected to embossing 6 b and 6 b for joining the back sheet 2 and the top sheet 3 in order to prevent displacement of the leg-surrounding absorber 4 </ b> B. Good. The embossing 6b and 6b can be applied continuously or intermittently along the flexible shafts 6 and 6.

  As shown in FIG. 11, the sanitary napkin 1 has an absorbent article on the back sheet 2 side of the leg-surrounding absorbent bodies 4B and 4B at a position passing through the leg-surrounding absorbent body 4B in a plan view. One or a plurality of elastic bodies 8, 8 may be provided along the substantially longitudinal direction. Due to the expansion and contraction action of the elastic bodies 8 and 8, as shown in FIG. 12, the leg-surrounding absorbent bodies 4B and 4B are pressed around the legs at the time of wearing, and the adhesion between the leg-surrounding absorbent bodies 4B and the leg perimeters. As a result, the followability to the movement of the leg is generated, and the leakage of body fluid can be prevented to a higher degree.

It is a partially broken perspective view of sanitary napkin 1 concerning the present invention. FIG. It is the III-III arrow line view. A general shorts S is shown, (A) is a perspective view, and (B) is a developed view cut at both sides thereof. It is sectional drawing which shows a use condition. It is a top view of the sanitary napkin 1 which shows the other formation aspect of the flexible shaft 6. FIG. It is a top view of the sanitary napkin 1 which shows the other formation aspect of the flexible shaft 6. FIG. It is a top view of the sanitary napkin 1 which shows the other formation aspect of the flexible shaft 6. FIG. It is sectional drawing of the sanitary napkin 1 which shows the other formation aspect of the flexible shaft 6. FIG. It is a top view of the sanitary napkin 1 which shows the other formation aspect of the flexible shaft 6. FIG. It is a top view of the sanitary napkin 1 which has arrange | positioned the elastic body 8. FIG. It is sectional drawing of the sanitary napkin 1 which shows the mounting state of the sanitary napkin 1 which has arrange | positioned the elastic body 8. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 4A ... Absorber main body, 4B ... Absorber for leg circumferences, 5 ... Crepe paper, 6 ... Possible Flexible axis, S ... shorts, S1 ... shorts line

Claims (8)

In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
In addition to the absorber body positioned inside the shorts in the mounted state, the absorbent body is exposed to the outside of the shorts and includes a pair of left and right leg absorbers that covers the base portion of the wearer's leg , absorbent article characterized in that the easily deformable flexible shaft along the panty line as the boundary line between the front Symbol absorbent body and the leg-surrounding absorber is formed.   The absorber main body and the leg-surrounding absorber are respectively independent absorbers, and the flexible shaft is formed by separating the absorber main body and the leg-surrounding absorber with a substantially equal width. Item 10. An absorbent article according to Item 1.   The absorber main body and the leg-surrounding absorber are respectively independent absorbers, and the flexible shaft gradually increases from the substantially center part of the crotch toward both ends of the absorber main body and the leg-surrounding absorber. The absorbent article according to claim 1, wherein the absorbent article is formed by being separated by a width to be separated.   The said absorber main body and the absorber for leg periphery are made into an integral absorber, and the said flexible shaft is formed by having a constriction part formed along a shorts line from the absorber side edge part. The absorbent article as described.   The absorber main body and the leg-surrounding absorber are formed as an integral absorber, and the flexible shaft is provided with a thin portion by squeezing the absorber along the shorts line or along the shorts line at the time of stacking. The absorbent article of Claim 1 currently formed.   The absorbent article according to any one of claims 1 to 5, wherein the leg-surrounding absorbent body is formed with a lower basis weight than the absorbent body.   The absorbent article in any one of Claims 1-6 to which the embossing which joins the said liquid-permeable surface sheet and a back surface sheet is given along the said flexible axis | shaft.   One or more elastic bodies are provided on the back sheet side of the leg-surrounding absorbent body at a position passing through the leg-surrounding absorbent body in a plan view along the substantially longitudinal direction of the absorbent article. Item 8. The absorbent article according to any one of Items 1 to 7.

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