JP3867061B2 - Method for manufacturing absorbent article - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an absorbent article mainly used for sanitary napkins, vaginal sheets, incontinence pads, toiletries, etc. Specifically, dry touch by inducing a small amount of menstrual blood, sweat, etc. to the absorber side together to continue to maintain the feeling, a method of manufacturing an absorbent product article reduce gloss and gave the texture of the nonwoven fabric.
[0002]
[Prior art]
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 There is known an intervening absorber made of cotton-like pulp or the like.
[0003]
In the absorbent article, in order to satisfy the dry touch feeling on the skin and to increase the absorption rate of body fluid, the liquid-permeable surface sheet is also referred to as a heat-sealable hydrophobic porous plastic sheet (hereinafter also referred to as a mesh sheet). ), A hydrophilic fiber sheet called a second sheet is interposed between the liquid-permeable surface sheet and the absorbent body, and the mesh sheet and the second sheet are joined discontinuously by a predetermined emboss pattern. Has been proposed. As an absorbent article which employ | adopted this structure, the following patent documents 1-3 etc. can be mentioned, for example.
[0004]
[Patent Document 1]
JP-A-7-328060 [Patent Document 2]
JP-A-8-117277 [Patent Document 3]
Japanese Patent Laid-Open No. 10-272152
[Problems to be solved by the invention]
Certainly, in the case of the above-described absorbent article, when the body fluid is discharged, it passes through the highly permeable mesh sheet and is quickly absorbed by the hydrophilic sheet, and a dry touch feeling is obtained even after the body fluid is absorbed. However, a minute amount of menstrual blood is hardly induced by the absorber and remains on the surface of the mesh sheet, or in summer, the surface of the mesh sheet is not absorbed by the hydrophilic fiber sheet. The mesh sheet remained on the skin, making it easier to stick to the skin and feeling sticky.
[0006]
On the other hand, the mesh sheet has a glossy feeling compared to the non-woven fabric, has a problem that the plastic sheet surface gives a cold impression, and looks bad.
[0007]
Therefore, the main problem of the present invention is to always maintain a dry touch feeling by inducing a small amount of menstrual blood or sweat that remains on the surface of the mesh sheet without being absorbed by the hydrophilic fiber sheet to the absorber side. as well as be capable of the invention is to provide a method of manufacturing an absorbent product article reduce gloss and gave the texture of the nonwoven fabric.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between a porous plastic surface sheet in which a large number of holes are formed and a liquid-impermeable back sheet, and the porous plastic A hydrophilic fiber sheet is interposed on the lower surface side of the surface sheet, and the fibers of the hydrophilic fiber sheet are extended from the opening of the porous plastic surface sheet to the upper surface side of the non-perforated sheet portion of the surface sheet. A method of manufacturing an absorbent article,
By passing a porous plastic surface sheet and a hydrophilic fiber sheet between an embossing roll having a fine uneven surface formed on the roll surface and an anvil roll having an uneven surface corresponding to the uneven surface, hydrophilic fibers are passed. Absorption characterized by extending the fiber of the sheet from the opening of the porous plastic surface sheet and then extending the protruding fiber to reach the unopened surface of the porous plastic surface sheet by passing through the nip A method for producing a functional article is provided.
[0009]
In the present invention according to the first aspect, the fibers of the hydrophilic fiber sheet are extended from the opening of the porous plastic surface sheet to the upper surface side of the non-perforated sheet portion of the surface sheet. Therefore, the extended fiber absorbs a minute amount of menstrual blood and sweat remaining on the surface of the mesh sheet, and can induce menstrual blood and sweat to the absorber side by capillary action. , You will be able to maintain a dry touch feeling. Further, since the surface of the plastic sheet is concealed by extending from the opening, the gloss feeling is reduced and the texture of the nonwoven fabric is obtained.
[0010]
As the hydrophilic fiber sheet, it is desirable to use an air-through nonwoven fabric that is relatively soft and bulky and includes many short fibers (staples). The fiber can be easily extended from the opening of the porous plastic surface sheet by embossing, has a good feel when in contact with the skin, and has a high water retention capability, so that it can be suitably used as a hydrophilic fiber layer of the present absorbent article.
[0011]
In order to extend the fibers of the hydrophilic fiber sheet from the openings of the porous plastic surface sheet, it is necessary to include short fibers. Specifically, it is desirable to contain 30 to 100% by weight of short fibers having a length of 2 mm or less with respect to the total weight.
[0012]
In the present invention according to claim 2, an absorbent body is interposed between the porous plastic surface sheet in which a large number of openings are formed and the liquid-impervious back sheet, and the lower surface side of the porous plastic surface sheet is hydrophilic. In the method for producing an absorbent article, in which an absorbent fiber sheet is interposed and the fibers of the hydrophilic fiber sheet are extended from the aperture of the porous plastic surface sheet to the upper surface side of the non-perforated sheet portion of the surface sheet. There,
A hole is formed in the non-porous plastic surface sheet by suction from below the support in a state where a non-porous plastic surface sheet and a hydrophilic fiber sheet are laminated on the upper surface of the support having a large number of holes. At the same time as forming, the fibers of the hydrophilic fiber sheet are protruded from the apertures, and the protruding fibers are laid down by passing through the nip so as to extend to the non-perforated surface of the porous plastic surface sheet. A method of manufacturing an absorbent article is provided.
[0013]
As the present invention according to claim 3, an absorbent body is interposed between the porous plastic surface sheet in which a large number of openings are formed and the liquid-impervious back sheet, and the bottom surface side of the porous plastic surface sheet is hydrophilic. In the method for producing an absorbent article, in which an absorbent fiber sheet is interposed and the fibers of the hydrophilic fiber sheet are extended from the aperture of the porous plastic surface sheet to the upper surface side of the non-perforated sheet portion of the surface sheet. There,
The surface of the porous plastic sheet and the hydrophilic fiber sheet were jetted by passing a jet water flow from the hydrophilic fiber sheet side so that the fibers of the hydrophilic fiber sheet protruded from the aperture and then passed through the nip. There is provided a method for producing an absorbent article, characterized in that the fiber is laid and extended so as to reach an unopened surface of the porous plastic surface sheet.
[0014]
The method for producing an absorbent article according to any one of claims 1 to 3, wherein, in the specific region of the porous plastic surface sheet, the fibers of the hydrophilic fiber sheet are extended from the openings in the specific region of the porous plastic surface sheet. Is provided.
[0015]
As the present invention according to claim 5, the fibers of the hydrophilic fiber sheet are extended from the aperture of the porous plastic surface sheet so that the ratio is 1 to 60% with respect to the non-perforated sheet portion of the surface sheet. A method for producing an absorbent article according to any one of claims 1 to 4 is provided.
[0016]
As for this invention which concerns on Claim 6, the diameter of the opening formed in the said porous plastic surface sheet is 0.05-3 mm, The number is 100-500 piece / cm < ² >, Any one of Claims 1-5 The manufacturing method of the absorbent article as described in 1 is provided.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken perspective view of a sanitary napkin 1 according to the present invention.
[0018]
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. In the illustrated example, an absorbent body 4 surrounded by a crepe paper 5 is interposed between the hydrophobic porous plastic surface sheet 3 and the porous plastic surface sheet 3. The hydrophilic fiber sheet 6 is arranged between the absorbent body 4 and the absorbent body 4. Around the absorber 4, the liquid-impermeable back sheet 2 and the porous plastic surface sheet 3 are bonded together by an adhesive means such as a hot melt adhesive.
[0019]
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.
[0020]
As the porous plastic surface sheet 3, a plastic sheet in which a large number of apertures 7, 7,... Are formed (so-called mesh sheet) is used. As this material sheet, for example, an olefin resin such as polyethylene or polypropylene is preferably used, but a polyamide resin such as polyester, nylon, EVA or the like can also be used.
[0021]
The diameter of the apertures 7 in the porous plastic surface sheet 3 is 0.05 to 3.0 mm, preferably 0.1 to 2.0 mm, more preferably 0.5 to 1.5 mm, and the number of apertures is 100. It is desirable to set it to about 500 / cm ² , preferably about 200 to 400 / cm ² . In order to form the opening 7, the synthetic resin sheet is softened near the softening temperature and is positioned on the upper surface of the support having a large number of openings. There are a method of pressurizing air pressure from the upper surface of the sheet, a method of drawing a large number of slits in the synthetic resin sheet material, and then stretching and opening the sheet material, and it can be formed by an appropriate method.
[0022]
The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the porous plastic surface sheet 3 is, for example, a mixture of a highly water-absorbent resin in pulp, or a mixture of chemical fibers in the pulp. What mixed the superabsorbent resin is 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.
[0023]
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.
[0024]
The hydrophilic fiber sheet 6 disposed between the porous plastic surface sheet 3 and the absorbent body 4 only needs to be hydrophilic to body fluids. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used. The hydrophilic fiber sheet 6 is not limited as long as it has a fiber layer, but preferably a non-woven fabric can be used as it is. There are various nonwoven fabrics such as spunlace nonwoven fabric, spunbond nonwoven fabric, melt blown nonwoven fabric, needle punch nonwoven fabric, and air-through nonwoven fabric depending on the production method. Among these nonwoven fabrics, it is desirable to use an air-through nonwoven fabric.
[0025]
A part or the whole of the porous plastic surface sheet 3 and the hydrophilic fiber sheet 6 are discontinuously joined by a plurality of embossments. Embossing for joining the porous plastic surface sheet 3 and the hydrophilic fiber sheet 6 may be performed from the porous plastic surface sheet 3 side or from the hydrophilic sheet 6 side. In general, the emboss pattern in this case is desirably a lattice shape, but may be an arbitrary pattern such as a rhombus lattice. The embossing method is generally thermocompression bonding, but ultrasonic bonding can also be employed. In addition, in order to prevent both sheets from separating to parts other than the joint part by the said embossing, you may adhere | attach partially with a hot-melt-adhesive.
[0026]
In the sanitary napkin 1 according to the present invention, as shown in detail in FIG. 3, the fibers of the hydrophilic fiber sheet 6 are passed through the openings 7, 7... Of the porous plastic surface sheet 3. The unperforated sheet portions 3a and 3a are extended so as to reach the upper surface side. In this case, from the opening 7,7 ... of the said porous plastic surface sheet 3, the ratio with respect to the area of the non-perforated sheet | seat part 3a, 3a is 1-60%, Preferably it is 2-30%, More preferably, it is 5-20% It is desirable to extend the fibers of the hydrophilic fiber sheet 6 so that
[0027]
The fibers of the hydrophilic fiber sheet 6 are extended from the openings 7, 7... Of the porous plastic surface sheet 3 to the upper surface of the non-perforated sheet portion of the surface sheet 3, thereby remaining on the surface of the porous plastic surface sheet 3. Absorbs a small amount of menstrual blood, sweat, etc., and can be induced to the absorber side (hydrophilic fiber layer side), so that a dry touch feeling can always be maintained, and a part of the plastic surface or Since most of the fibers are concealed by the extended fibers, the gloss is reduced and the appearance has a non-woven texture.
[0028]
In addition, the region in which the fibers of the hydrophilic fiber sheet 6 are extended from the openings 7, 7... Can be the entire region where the hydrophilic fiber sheet 6 is disposed. It is also possible to limit the area such as the periphery thereof, the front and rear parts, or both side parts excluding the discharge part area H. Limiting the area does not impair the advantages of the porous plastic surface sheet, such as absorption speed and prevention of reversion, and removes a small amount of menstrual blood or sweat remaining on the surface of the porous plastic surface sheet 3 (hydrophilic fiber layer). To the side).
[0029]
By the way, in order to extend the fibers of the hydrophilic fiber sheet 6 from the openings 7, 7... Of the porous plastic surface sheet 3, there are several methods.
[0030]
For example, as shown in FIG. 4A, the first method includes an embossing roll 10 having a fine uneven surface (wave shape) formed on the roll surface, and an uneven surface (wave shape) corresponding to the uneven surface. By passing the porous plastic surface sheet 3 and the hydrophilic fiber sheet 6 between the anvil rolls 11, the fibers of the hydrophilic fiber sheet 6 are extended from the openings 7, 7,. After that, the protruding fiber is passed through between the nips and is extended so as to reach the unopened surface of the porous plastic surface sheet 3, and as the second method, as shown in FIG. By sucking from below the support 12 in a state in which the non-porous plastic surface sheet 3A and the hydrophilic fiber sheet 6 are laminated on the upper surface of the support 12 having an opening of .. Are formed in the face sheet 3A, and at the same time, the fibers of the hydrophilic fiber sheet 6 are protruded from the openings 7, 7. As shown in FIG. 4 (C), the method of extending to the unopened surface of the substrate, and the third method is hydrophilic with respect to the porous plastic surface sheet 3 and the hydrophilic fiber sheet 6. By causing a jet water flow from the side of the fiber sheet 6 to cause the fibers of the hydrophilic fiber sheet 6 to protrude from the apertures 7, 7... The method of extending so that it may reach a hole surface etc. can be mentioned.
[0031]
In order to extend the fibers of the hydrophilic fiber sheet 6 from the openings of the porous plastic surface sheet 3, the hydrophilic fiber sheet 6 needs to contain short fibers. Specifically, it is desirable that short fibers having a length of 2 mm or less, preferably 1 mm or less are contained in an amount of 30 to 100%, preferably 60 to 80%, based on the total weight (total weight of the hydrophilic fiber sheet 6). .
[0032]
【The invention's effect】
As described in detail above, according to the present invention, a dry touch feeling is always obtained by inducing a small amount of menstrual blood, sweat or the like that remains on the surface of the mesh sheet without being absorbed by the hydrophilic fiber sheet to the absorber side. It is possible to obtain an absorbent article that can be maintained, has a reduced gloss, and has a non-woven fabric texture.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a sanitary napkin 1 according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part thereof.
FIG. 3 is an enlarged cross-sectional view of a porous plastic surface sheet 3 portion.
FIGS. 4A to 4C are method diagrams for extending fibers from the apertures 7 of the porous plastic surface sheet 3, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Porous plastic surface sheet, 3a ... Unperforated sheet part, 4 ... Absorber, 5 ... Crepe paper, 6 ... Hydrophilic fiber sheet, 7 ... Open hole

Claims (6)

An absorbent body is interposed between the porous plastic surface sheet in which a large number of openings are formed and the liquid-impervious back sheet, and a hydrophilic fiber sheet is interposed on the lower surface side of the porous plastic surface sheet. A method for producing an absorbent article in which fibers of an absorbent fiber sheet are extended from an opening of the porous plastic surface sheet so as to reach an upper surface side of an unopened sheet portion of the surface sheet,
By passing a porous plastic surface sheet and a hydrophilic fiber sheet between an embossing roll having a fine uneven surface formed on the roll surface and an anvil roll having an uneven surface corresponding to the uneven surface, hydrophilic fibers are passed. Absorption characterized by extending the fiber of the sheet from the opening of the porous plastic surface sheet and then extending the protruding fiber to reach the unopened surface of the porous plastic surface sheet by passing through the nip A method for producing a functional article. An absorbent body is interposed between the porous plastic surface sheet in which a large number of openings are formed and the liquid-impervious back sheet, and a hydrophilic fiber sheet is interposed on the lower surface side of the porous plastic surface sheet. A method for producing an absorbent article in which fibers of an absorbent fiber sheet are extended from an opening of the porous plastic surface sheet so as to reach an upper surface side of an unopened sheet portion of the surface sheet,
A hole is formed in the non-porous plastic surface sheet by suction from below the support in a state where a non-porous plastic surface sheet and a hydrophilic fiber sheet are laminated on the upper surface of the support having a large number of holes. At the same time as forming, the fibers of the hydrophilic fiber sheet are protruded from the apertures, and the protruding fibers are laid down by passing through the nip so as to extend to the non-perforated surface of the porous plastic surface sheet. Manufacturing method of absorbent article. An absorbent body is interposed between the porous plastic surface sheet in which a large number of openings are formed and the liquid-impervious back sheet, and a hydrophilic fiber sheet is interposed on the lower surface side of the porous plastic surface sheet. A method for producing an absorbent article in which fibers of an absorbent fiber sheet are extended from an opening of the porous plastic surface sheet so as to reach an upper surface side of an unopened sheet portion of the surface sheet,
The surface of the porous plastic sheet and the hydrophilic fiber sheet were jetted by passing a jet water flow from the hydrophilic fiber sheet side so that the fibers of the hydrophilic fiber sheet protruded from the aperture and then passed through the nip. A method for producing an absorbent article, characterized in that the fiber is laid and extended so as to reach an unopened surface of the porous plastic surface sheet. The method for producing an absorbent article according to any one of claims 1 to 3, wherein the fibers of the hydrophilic fiber sheet are extended from the openings in a specific region of the porous plastic surface sheet. The fiber of a hydrophilic fiber sheet is extended from the opening of the said porous plastic surface sheet so that it may become a ratio of 1 to 60% with respect to the non-perforated sheet part of a surface sheet. The manufacturing method of the absorbent article as described in any one of. The apertures formed in the perforated plastic surface sheet is a diameter of 0.05 to 3 mm, a manufacturing method of an absorbent article according to the number of claims 1 to 5 or a 100 to 500 pieces / cm ² .

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