JP4825097B2 - Absorbent articles - Google Patents

Description

  The present invention mainly relates to absorbent articles used for sanitary napkins, vaginal discharge sheets, incontinence pads, medical pads, toiletries, etc., and by providing a length adjustment function and sufficient absorption performance, The present invention relates to an absorbent article that can be adapted to a difference in body shape or physiological state.

  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 this type of absorbent article, products having different sizes such as S, M, and L, and different sizes and structures for daytime and nighttime are provided according to individual body type differences and physiological conditions. Further, for example, as shown in Patent Document 1 below, in order to effectively prevent front leakage and rear leakage according to the use state, a configuration in which the front and rear lengths are optimally configured from the blood drainage site is also proposed. ing. Specifically, in order to prevent pre-leakage and back-leakage at bedtime at the same time, the length from the center of the specific structure to the ventral front end is longer than the length from the dorsal rear end. A sanitary napkin and a daytime sanitary napkin that is formed with a relatively long length from the position corresponding to the body fluid discharge port to the front end of the abdomen in order to prevent front leakage particularly in the sitting and standing postures are described. Yes.
JP 2001-276123 A

  However, even if the napkin shape and structure are changed according to the use situation, such as a napkin of different sizes or the napkin described in Patent Document 1, the body shape of each person is different, so it is too long and feels stuffy. On the contrary, there was a problem that leakage was caused because it was too short. Naturally, the amount of menstrual blood discharged varies from person to person, and even for the same person, it varies with the passage of the menstrual period, so a napkin with sufficient absorption performance is necessary. Met.

  In order to meet the above-mentioned needs, the manufacturer must provide napkins of various lengths according to the body type, and napkins with various absorption performances according to the discharge amount of menstrual blood and the like. However, there is a problem that the manufacturing cost increases.

  On the other hand, it is necessary for the user to select a napkin having a length suitable for his / her body shape, or a napkin having an absorption performance corresponding to the discharge amount of menstrual blood or the like. For this reason, there are problems in the difficulty of selecting an optimal one from a wide variety of napkins, the economic burden of purchasing a plurality of types of napkins, and securing the storage location.

  Therefore, a main object of the present invention is to provide an absorbent article that can be adjusted in length according to the body shape of an individual and has sufficient absorption performance even when the amount of discharged body fluid is large.

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,
The absorber has a plurality of absorber along the longitudinal direction of the absorbent article is continuously provided with overlapping margin each other, together with the liquid-permeable topsheet and the backsheet to have a middle fold to allow expansion and contraction The folded portion formed on the back sheet is a folded portion that folds the back sheet in the longitudinal direction of the absorbent article and restrains the expansion from the folded state in stages.
Provided is an absorbent article characterized in that the longitudinal dimension of the absorbent article can be adjusted by pulling out the front side and / or the rear side absorbent body from among the plurality of absorbent bodies arranged continuously. .

  In the present invention according to the first aspect, the liquid-permeable top sheet and the back sheet have a folded portion in the middle so that they can be expanded and contracted. Since the longitudinal dimension of the absorbent article can be adjusted by pulling out the rear side absorbent body, the length can be arbitrarily adjusted in accordance with the individual body shape. In addition, since the absorbent body is configured such that a plurality of absorbent bodies are connected with each other along the longitudinal direction of the absorbent article, the absorbent body has sufficient absorption performance even when the amount of discharged body fluid is large. be able to.

Moreover, the folding part formed in the said back sheet is a folding part which folded the back sheet in the longitudinal direction of the said absorbent article, and restrained expansion | deployment from this folding state in steps. Therefore, the absorbent article can be extended stepwise from the folded state of the folded portion to the expanded state.

As the present invention according to claim 2 , the folding part is provided with a plurality of folding parts in which the back sheet is folded inward at intervals in the longitudinal direction of the absorbent article, and can be peeled on the inner surface side of each folding part. together they are joined, the absorbent article according to claim 1, wherein you have to be phased constraints on the development from the folded state by changing the bonding strength of each folding unit is provided.

The invention described in claim 2 shows a specific form of forming the folded portion. A plurality of the folding parts are provided at intervals in the longitudinal direction of the absorbent article, and are detachably joined on the inner surface side of each folding part, and by varying the joining strength at each folding part, the front side and When pulling out the rear side absorbent body, it can be developed in order from the fold portion having the lower bonding strength, and the absorbent article can be extended stepwise.

As the present invention according to claim 3, wherein said absorbent body, the absorbent according to claim 1, 2 or the absorption of two, which is continuously provided with a lap margin each other along the longitudinal direction of the absorbent article Articles are provided.

As the present invention according to claim 4, in overlapping margin portions of the absorbent body, whereas according to claim 1 to 3 or which is provided with a protruding piece protruding toward the other side absorbent body side to an end center of the side absorbent body An absorbent article as described in 1 above is provided.

In the present invention described in claim 4 , since the protruding piece functions as a middle-high part in which the widthwise center part of the absorbent body is formed as a middle-high during use, the middle-high part fits the body and quickly absorbs bodily fluids. become able to. Furthermore, by making the absorbent body of the portion where the contact opportunity with the body fluid is the largest into a multilayer structure, the absorption performance of the body fluid can be improved as a whole, and the feeling of sticking of the absorbent body can be reduced.

As this invention which concerns on Claim 5 , the absorbent article in any one of Claims 1-4 provided with a horizontal shift | offset | difference restraining means in the overlap margin part of the said absorber is provided.

As the present invention according to claim 6 , there is provided the absorbent article according to claim 5 , wherein the lateral displacement restraining means is formed by winding the absorbent bodies in the width direction with a liquid-permeable sheet material.

In the present invention according to the fifth and sixth aspects, the absorbent body is wound in the width direction by a liquid-permeable sheet material, and the like, by including a lateral displacement restraining means in the overlapping portion of the absorbent body, The lateral shift of the absorbent body can be prevented, and the dimension adjustment in the longitudinal direction of the absorbent article is facilitated.

As this invention which concerns on Claim 7 , each said absorber is joined to the said liquid-permeable surface sheet and / or back surface sheet in the area | region which does not inhibit adjustment of the longitudinal dimension of an absorbent article. 6. An absorbent article according to any one of 6 is provided.

In the present invention according to claim 7 , each of the absorbers is bonded to the liquid-permeable top sheet and / or the back sheet in a region that does not hinder the adjustment of the longitudinal dimension of the absorbent article. Can be prevented, and the movement of the absorbent body in the longitudinal direction of the absorbent article is facilitated.

  As described above in detail, according to the present invention, it is possible to realize an absorbent article that can be adjusted in length according to the body shape of an individual and has sufficient absorption capability even when the amount of body fluid discharged is large.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, FIG. 2 is a view taken along the line II-II, and FIG. 3 is a view taken along the line III-III in FIG.

  The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable surface sheet 3 that allows permeation of menstrual blood, or vaginal discharge quickly, and a space between the two sheets 2 and 3. An absorbent body 4 made of cotton-like pulp or synthetic pulp intervening in the sheet, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4, and longitudinally on both sides of the surface. It is comprised from the side nonwoven fabrics 6 and 6 formed along the direction. In the periphery of the absorbent body 4, the outer edges of the side nonwoven fabric 6 and the liquid-impervious back sheet 2 or the liquid-permeable surface sheet 3 are formed by adhesives such as hot melt or heat seals at the upper and lower end edges. Bonded by an adhesive means.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
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, cotton-like pulp, considering the case of applying the concave-pattern, 50~700g / m ^2, preferably it is preferable that the basis weight of 100~650g / m ^2. Moreover, what mixed highly water-absorbing resin into this pulp, or what mixed high-water-absorbing resin while mixing a chemical fiber in pulp can also be used. 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. 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.

  On the other hand, side nonwoven fabrics 6 and 6 are provided on the both sides of the sanitary napkin 1 along the longitudinal direction and over almost the entire length of the napkin 1, respectively. As the side nonwoven fabric 6, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. 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. On the other hand, if importance is attached to absorbability such as menstrual blood, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the production process of synthetic fiber, Use a non-woven fabric that has been treated with a metal salt to make the synthetic fiber swelled or porous, such as by partially dissolving the surface to make it porous and depositing metal hydroxide, and applying hydrophilicity by applying capillary action It is desirable to do so.

  In the present invention, in particular, in order to obtain a sanitary napkin 1 adapted to the body shape or physiological state of an individual, first, the absorbent body 4 includes a plurality of absorbent bodies along the longitudinal direction of the sanitary napkin 1, illustrated examples. Then, it is set as the structure where two absorbers which consist of 4 A of front side absorbers, and the back side absorber 4B were mutually connected with the overlap margin 7. FIG. Secondly, the liquid-permeable top sheet 3 and the back sheet 2 have a structure having folded portions 8, 9... In the middle so that the sanitary napkin 1 can expand and contract in the longitudinal direction. In use, the sanitary napkin 1 having such a configuration is folded as described above by pulling out the front absorbent body 4A and / or the rear absorbent body 4B as shown in FIG. The sections 8, 9... Are changed from the folded state to the expanded state, and the longitudinal dimension of the sanitary napkin 1 can be adjusted stepwise. As a result, a napkin suitable for the individual's body shape is realized, and the overlap margin 7 is formed on the absorbent body as described above, so that it has sufficient absorption performance even when the amount of body fluid discharged is large. Yes.

  Although the folding part 8 formed on the top sheet 3 side is a folding structure in which the top sheet 3 is reciprocated once in the illustrated example, it may be a folded structure in which the overlapping part is narrowed by reciprocating a plurality of times.

  As shown in FIG. 2, the folding part 9 formed on the back sheet 2 side folds the back sheet 2 in the longitudinal direction of the sanitary napkin 1, and the development from the folded state is constrained in stages. It is like that. Specifically, the folding part 9 folds the back sheet 2 inward over the entire width of the back sheet 2, and the back sheet 2 is a hot melt adhesive on the inner surface side of the folding part 9. It has a structure that is detachably bonded by a bonding means such as heat fusion.

  In order to enable the stepwise adjustment of the longitudinal dimension of the sanitary napkin 1, the folding portion 9 has a plurality of locations, preferably at intervals in the longitudinal direction of the sanitary napkin 1 as shown in FIG. It is preferable to provide two to three places, in the illustrated example, three places. At this time, the joining strength of the joining means provided in each of the folding portions 9, 9... May be evenly formed, but it is preferable to make the joining strength different in each of the folding portions 9, 9. More preferably, the bonding strength is sequentially increased or decreased from the rear side to the front side of the sanitary napkin 1. As shown in FIGS. 4A to 4C from the state shown in FIG. 2 when the front side absorber 4A and / or the rear side absorber 4B is pulled out by making the joint strengths of the respective folding parts different. In addition, the sanitary napkin 1 can be expanded in stages, starting from the folding portion 9 having a low bonding strength, and in the illustrated example, starting from the rear folding portion 9.

  On the other hand, each of the absorbent bodies 4A and 4B is preferably joined to the top sheet 3 and / or the back sheet 2 in a region that does not hinder the adjustment of the longitudinal dimension of the sanitary napkin 1. For example, as shown in FIG. 2, in the front absorbent body 4A in which the folded portion 9 is not formed, the region that does not hinder the adjustment of the longitudinal dimension is a contact region and skin contact with the back sheet 2 on the non-skin contact surface side. In the rear absorbent body 4B that indicates the contact area with the surface sheet 3 on the contact surface side, and the folding part 9 is formed, the back sheet 2 on the back side of the folding parts 9, 9 on the non-skin contact surface side. And the contact area with the surface sheet 3 on the skin contact surface side. Each of the absorbers 4A and 4B may be the same type of absorber made of pulp pile fiber, or may be the same type of absorber made of thin sheet pulp. Furthermore, it is also possible to configure one side with pulp pile and the other with thin sheet pulp.

  On the other hand, it is preferable that the overlap margin 7 is formed in a portion including a discharge port corresponding region where body fluid is discharged. The portion including the discharge port corresponding region is used as the stacking allowance 7 in which the absorbent body 4 is laminated, so that even if a certain amount of body fluid is discharged, sufficient absorption performance is obtained. In addition, in the stacking allowance 7, in the illustrated example, the rear side absorber 4B is the lower layer side and the front side absorber 4A is the upper layer side, but this relationship is reversed, and the rear side absorber 4B is the upper layer side and the front side absorber. 4A may be the lower layer side.

  Further, as shown in FIGS. 5 and 6, the sanitary napkin 1 protrudes toward the other side absorber at the center of the end of the one side absorber at the overlapping portion 7 of the absorbers 4 </ b> A and 4 </ b> B. The protruding piece 10 may be provided. FIG. 5 is an example in which a protruding piece 10 that protrudes toward the front absorbent body 4A side is provided at the center of the end of the rear absorbent body 4B, and FIG. 6 shows the rear side at the center of the end of the front absorbent body 4A. It is the example which provided the protrusion piece part 10 which protrudes toward the absorber 4B. The protruding piece 10 functions as a middle-high part in which the central part in the width direction of the absorbent body is formed as a medium-high during use, and the middle-high part fits the body and quickly absorbs bodily fluids. Furthermore, by partially forming the absorbent body of the part where the contact opportunity with the body fluid is maximized into a multilayer structure, the absorption performance of the body fluid can be improved as a whole, and the feeling of sticking of the absorbent body can be reduced.

  As shown in FIG. 7, the sanitary napkin 1 is provided with a lateral displacement restraining means for restraining the lateral displacement between the absorbent bodies 4A and 4B at the overlapping portion 7 of the absorbent bodies 4A and 4B. You may do it. The lateral displacement restraining means may be formed by winding the absorbent bodies 4A and 4B in the width direction with a liquid-permeable sheet material 11 such as crepe paper or nonwoven fabric.

  The absorbers 4A and 4B can be embossed in various shapes in order to fit the absorber to the body and improve the absorption of bodily fluids. In this embossing, as shown in FIG. 8 (A), after embossing 12A and 12B is applied to each of the absorbent bodies 4A and 4B, the absorbent bodies are connected to each other with an overlap. Alternatively, as shown in FIG. 5B, the absorbers 4A and 4B may be connected to each other with an overlap, and then the absorbers may be embossed 12A and 12B. As shown in FIG. 8 (A), when embossing 12A and 12B are applied to each of the absorbent bodies 4A and 4B, embossing can be given to the overlapping portion 7 portion, and menstrual blood can be effectively delivered. Can spread. As shown in FIG. 8 (B), when embossing is performed after the absorbers 4A and 4B are arranged in series, it is necessary to emboss while avoiding the overlap margin 7, but only one embossing step is required. It becomes like this.

[Other examples]
(1) In the above embodiment, the folding parts 9, 9... Are provided with a plurality of folding parts in which the back sheet 2 is folded inward at intervals in the longitudinal direction of the absorbent article, and the inner surfaces of the folding parts 9. Although it was formed by being detachably joined on the side, as shown in FIGS. 9 (A) and 9 (B), a folding portion 13 in which the back sheet 2 is folded inward or outward is provided in one place. In addition, a plurality of joint portions 14, 14... That can be peeled on the inner surface side of the folding portion 13 may be provided at intervals in the longitudinal direction of the sanitary napkin 1. Since a plurality of peelable joint portions 14 are provided on the inner surface side of the folding portion 13 at intervals in the longitudinal direction of the sanitary napkin 1, The operation of pulling out the part-side and / or rear-side absorber sequentially releases the joints 14, 14... Constrained in stages, and allows the back sheet 2 to be deployed in stages from the folded state. . In this case, the bonding strengths of the bonding portions 14, 14... May be equal to each other, but when the front side and / or the rear side absorber is pulled out, the bonding strength may be increased in the order in which the bonding is released. preferable. In addition, by making the folding mode of the back sheet 2 and the top sheet 3 the same as described above, the folding process can be easily performed and the unfolding can be performed smoothly.
(2) In the above-described embodiment, the absorber 4 is configured such that two absorbers composed of the front-side absorber 4A and the rear-side absorber 4B are connected to each other with an overlap margin 7, but three or more These absorbers may be connected to each other with an overlap allowance of 7, 7,.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view. It is the III-III arrow directional view of FIG. It is the II-II line arrow directional view of FIG. 1 which shows the expansion | deployment point of the folding part 9. FIG. It is an expanded view of the sanitary napkin 1 which concerns on another form example. It is an expanded view of the sanitary napkin 1 which concerns on another form example. (A) of the sanitary napkin 1 provided with the lateral displacement restraining means is a developed view, and (B) is a view taken along the line BB of FIG. (A), (B) is a top view of the absorber 4 which shows the construction state of concave embossing. It is the II-II arrow directional view of FIG. 1 which shows the Example of the folding part 9. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Back sheet, 3 ... Top sheet, 4 ... Absorber, 4A ... Front side absorber, 4B ... Rear side absorber, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 7 ... Overlap allowance, 8 ·········································································································· 11

Claims (7)

In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
The absorber has a plurality of absorber along the longitudinal direction of the absorbent article is continuously provided with overlapping margin each other, together with the liquid-permeable topsheet and the backsheet to have a middle fold to allow expansion and contraction The folded portion formed on the back sheet is a folded portion that folds the back sheet in the longitudinal direction of the absorbent article and restrains the expansion from the folded state in stages.
An absorptive article characterized in that a longitudinal dimension of the absorptive article can be adjusted by pulling out a front part side and / or a rear part side absorbent body among the plurality of absorbent bodies provided continuously. The foldable portion is provided with a plurality of foldable portions in which the back sheet is folded inward at intervals in the longitudinal direction of the absorbent article, and is detachably joined on the inner surface side of each foldable portion. the absorbent article of claim 1, wherein you have to be phased constraints on the development from the folded state by varying the bonding strength at. The absorbent article according to any one of claims 1 and 2 , wherein the absorbent body is two absorbent bodies that are connected to each other along the longitudinal direction of the absorbent article with an overlap. The absorbent article according to any one of claims 1 to 3, wherein a protruding piece portion that protrudes toward the other side absorber is provided in the center of the end of the one side absorber in the overlapping portion of the absorber. The absorbent article according to any one of claims 1 to 4 , further comprising a lateral displacement restraining means in the overlapping portion of the absorbent body. The absorbent article according to claim 5, wherein the lateral displacement restraining means is formed by winding the absorbent bodies in the width direction with a liquid-permeable sheet material. The absorbent article according to the respective absorber, in the region that does not inhibit the adjustment of the longitudinal dimension of the absorbent article, according to claim 1 to 6 or which is bonded to the liquid-permeable topsheet and / or backsheet .

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