JPH0866425A - Absorptive commodity - Google Patents

Abstract

PURPOSE: To provide an absorptive commodity without separating into a surface material and an absorption sheet even under a condition that the effect of gravity cannot be utilized, such as in wearing a loose shorts, drastic exercise, sleeping, etc., and an excretion in large quantity, and invariably with only little surface residual, excellent in absorbing liquid, and only little sticky. CONSTITUTION: In an absorptive commodity comprising a liquid penetrable surface material 2, a liquid absorptive material 3, and a liquid impenetrable liquid-proof material 4, the surface material consists of at least an integrated liquid penetrable sheet of a skin contact face layer 2a and a skin non-contact face layer 2b. And, the skin contact face 2a is formed with a porous film made of thermoplastic resin or a nonwoven fabric made of synthetic fiber, and the skin non-contact face an absorptive sheet at least containing high bulk cellulose fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins, disposable diapers, incontinence pads, surgical pads, and breast milk sheets. More specifically, the movement of liquid from the surface to the absorbent body is prevented. The present invention relates to a highly absorbent absorbent article which is smooth and has little surface liquid residue and surface tackiness.

[0002]

BACKGROUND OF THE INVENTION In general, absorbent articles such as sanitary napkins and disposable diapers include an absorbent body that absorbs liquids such as blood and urine, and skin that covers the surface of the absorbent body. And a back surface material that covers the surface of the absorber to prevent liquid leakage. The surface material of the absorbent article is required to have a liquid absorption / permeation function for promptly transferring a liquid such as blood or urine to the absorbent body and causing the absorbent body to absorb the liquid. On the other hand, the absorber is required to have a function of rapidly receiving the liquid absorbed by the surface material and absorbing and holding the liquid.

The movement of the liquid from the above-mentioned surface material to the absorber is
It is realized only when the two are in intimate contact with each other, and when these are spaced apart from each other, liquid transfer from the surface material to the absorber is extremely reduced, and on the surface material, There is an inconvenience that the amount of remaining liquid increases, the user feels sticky, the liquid diffuses, and the liquid flows, which causes liquid leakage.

The malabsorption caused by such separation of the surface material and the absorbent body is particularly remarkable when the surface material is made of a fiber aggregate such as a non-woven fabric which itself has absorbability. For example, when the surface material is formed of a non-woven fabric, when the surface material and the absorber are separated, the liquid is not transferred to the absorbent while the liquid remains stagnant in the surface material and sticks to the user forever. It gives a feeling and cannot be used comfortably.

Further, when the surface material is a film type which does not have absorbency itself (aperture film or an aperture net), if the surface material and the absorber are in close contact, the surface The liquid does not easily remain in the material, and the user does not feel sticky and can be used comfortably, but when the surface material and the absorber are separated, the surface material itself does not have absorbency. However, the liquid is not absorbed on the surface material and flows on the surface to leak, which is a fatal defect in the absorbent article.

From such a point of view, various techniques have been proposed in order to prevent the absorbent and the surface material from being separated, particularly in an absorbent article using a film type surface material. For example, JP-A-57-1339 and JP-A-6-6
In 0-259261, a technique is proposed in which fibers for liquid suction are integrated with a surface material via an adhesive to smooth the liquid transfer from the surface material to the absorber and prevent separation from the absorber. Has been done. In the above technique, it is possible to eliminate the disadvantage caused by the fact that the apertured film itself does not have absorbency, but the absorbent body is not a sheet-like object, but the disjointed fibers are attached to the surface material. Therefore, only a part of the fibers integrated with the surface material easily peels off from the absorbent body, and essentially, the surface material and the absorbent cannot be integrated at all, but rather partially. There is a disadvantage that the adhered fibers promote unfavorable liquid retention and diffusion on the surface material and cause liquid leakage.

To solve these problems, Japanese Patent Laid-Open No. 4-322645 discloses a surface material and a liquid-retaining absorber, particularly an absorber covered with an absorbent sheet. Occupied area of 7 using an adhesive with adhesive properties
A technique of fixing and integrating at 0% or less has been proposed. According to this technique, when the surface material and the absorber are integrated without separation, and a film type surface material (perforated film or perforated net) that does not permeate into the liquid itself is used as the surface material, It has become possible to guide the body fluid to the absorbent body without flowing the body fluid on the surface material or on the surface material itself.

However, the effect of the above technique is not yet sufficient, and especially in the case of a non-woven fabric or the like in which the surface material itself has absorptivity and oozes into the liquid in the surface material, depending on the type of the absorbent sheet to be integrated, On the contrary, the absorption performance deteriorates. That is, when an absorbent paper made from natural pulp, which has been widely used in absorbent articles, is used as the absorbent sheet-like material, when water is dehydrated / dried in the dehydration / wet pressure / drying process during papermaking. In addition, the interfacial tension of water between pulp fibers and a very strong tightening force due to hydrogen bonding work to tighten the pulp fibers, so that the absorbent paper has a very slow absorption / permeation rate of body fluid. Therefore, if a large amount of body fluid is excreted when the nonwoven fabric and the absorbent paper are integrated, the absorbent paper may flow and leak on the surface of the surface material due to insufficient permeation speed of the absorbent paper,
The liquid remaining on the surface material becomes worse.

Further, Japanese Patent Laid-Open No. 63-73958 reports a liquid permeable material composed of a composite material in which a first layer and a second layer are laminated and integrated. In the composite material, the first layer in contact with the skin side is made of a porous material such as an apertured film or a nonwoven fabric, and the first layer is made of a nonwoven fabric or a foamed material.
The layers are glued together. When the physiological saline is absorbed, most of the composite material needs to pass through the first layer and the second layer only by the influence of gravity.

In the absorbent article constructed by using the above composite material as the surface material, the body fluid is smoothly absorbed by the absorbent body in the situation where the body fluid is absorbed from the surface material toward the absorbent body by gravity. The direction of absorption from the material to the absorber does not always match the direction of gravity,
For example, when sleeping, the direction in which the absorbent is absorbed from the surface material is almost perpendicular to the gravity, and the fluid cannot be guided to the absorbent due to gravity, resulting in malabsorption and the fluid flowing on the surface. It will leak. In particular, since the body fluid is transmitted only by its own weight, the capillary radii of the first layer and the second layer are also large, and the vertical suction height of physiological saline, which represents the absorption capacity thereof, is 1
It requires less than 0.5 inches after 5 minutes. As described above, when the absorbent layer having excellent permeability to body fluid but insufficient capillary absorption is used as the second layer, the remaining liquid is deteriorated under the condition that the effect of gravity cannot be utilized such as when sleeping. However, there is a drawback that body fluid flows and leaks on the surface.

Therefore, an object of the present invention is to provide a surface material as a surface material even when loose shorts are worn, under heavy exercise, under conditions where the effect of gravity cannot be used, or under large excretion conditions. Without separating from the absorption sheet,
An object of the present invention is to provide an absorbent article which has a small amount of surface liquid remaining and is excellent in liquid absorbency and which is less sticky.

[0012]

Means for Solving the Problems Under the circumstances, the inventors of the present invention have found that the liquid flows on the surface material under any use condition such as wearing any shorts, vigorous exercise condition, and sleeping.
With respect to the absorbent article having less liquid residue and less stickiness, which is excellent in liquid absorbency, as a result of various studies, by using a specific laminated and integrated surface material as the liquid permeable surface material used for the absorbent article, It was found that

The present invention has been made based on the above findings, and in an absorbent article having a liquid-permeable surface material, a liquid-retaining absorbent material, and a liquid-impermeable leak-proof material, the surface material is At least a skin-contacting surface layer and a non-skin-contacting surface layer are laminated and integrated into a liquid-permeable sheet, and a) the skin-contacting surface layer is made of a perforated film or synthetic fiber made of a thermoplastic resin. And a non-skin contacting surface layer b) formed of an absorbent sheet containing at least bulky cellulose fibers. is there.

[0014]

The absorbent article of the present invention comprises, as a liquid-permeable surface material, a skin contact surface layer formed on the skin side by a perforated film made of a thermoplastic resin or a nonwoven fabric made of synthetic fiber, Since a liquid permeable sheet formed by laminating and integrating a non-skin contact surface layer formed of an absorbent sheet containing a bulky cellulose fiber having high strength and high liquid permeability is used, any wearing condition Even below, when the excreted body fluid is absorbed by the open-pore film or the non-woven fabric on the surface side, the absorbent sheet of the non-skin contact surface layer quickly absorbs the body fluid and can smoothly permeate the absorbent body. . Therefore, in the absorbent article of the present invention, body fluid is guided to the absorbent body without flowing / remaining liquid on the surface material under any conditions, and has high absorption performance and less stickiness.

[0015]

EXAMPLES The present invention will be described in detail below with reference to the drawings, and the present invention will be specifically described with reference to Examples and Comparative Examples.

First, the absorbent article of the present invention will be described in detail with reference to FIGS. Here, FIG. 1 is a schematic cross-sectional view showing a cross section in the width direction of a sanitary napkin as an absorbent article of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the surface material in FIG. 3 is a schematic cross-sectional view showing a cross section in the width direction of another example of the sanitary napkin as the absorbent article of the present invention, and FIG. 4 is an enlarged cross-sectional view showing the surface material in FIG.

A sanitary napkin 1 as an absorbent article of the present invention shown in FIG. 1 has a liquid-permeable surface material 2, a liquid-retaining absorber 3 and a liquid-impermeable leak preventer 4. The surface material 2 is composed of at least a liquid-permeable sheet in which a skin contact surface layer 2a and a non-skin contact surface layer 2b having different compositions are laminated and integrated, and a) the skin contact surface layer. Two
a is a layer formed of a perforated film made of a thermoplastic resin or a non-woven fabric made of synthetic fibers, and b) the non-skin contact surface layer 2b is an absorbent sheet containing at least bulky cellulose fibers. Is a layer formed by

More specifically, the sanitary napkin 1 is formed substantially vertically and the surface material 2 is formed.
Directly cover the surface side and the side surface of the absorbent body 3, and on the non-skin contact surface side, the surface material 2 and the absorbent body 3, and the surface material 2 and the leak preventer 4 meet the fixing material 5. And is fixed. Further, the non-skin contact surface side surface of the leak preventer 4 is provided with an anti-displacement agent 6 for fixing the sanitary napkin to the shorts at the time of use. Protected. Here, the absorber 3 is composed of a flap pulp 3a, a highly absorbent polymer 3b, and a wet absorbent paper 3c. Further, as materials for the flap pulp 3a, the superabsorbent polymer 3b, the wet absorbent paper 3c, the leak preventer 4, the fixative 5, the deviation preventive 6 and the release paper 7, conventionally used for absorbent articles. Known materials described above can be used without particular limitation.

Thus, in the sanitary napkin 1, as shown in FIGS. 1 and 2, the surface material 3 is integrally laminated with the skin contact surface layer 2a and the non-skin contact surface layer 2b. It is composed of a liquid permeable sheet formed by liquefying.

The skin contact surface layer 2a is formed of a perforated film made of a thermoplastic resin or a nonwoven fabric made of synthetic fibers. As the perforated film made of the thermoplastic resin, a perforated film or perforated net of the film type conventionally used for the surface material of the absorbent article, specifically from thermoplastic resins such as polyethylene and polypropylene. A perforated film obtained by punching a film of The non-woven fabric composed of the above synthetic fibers, wet and dry non-woven fabrics conventionally used for the surface material of absorbent articles, specifically polyethylene, polypropylene, polyester, polyethylene-polypropylene composite fiber, polyethylene-polyester composite fiber, Examples include dry nonwoven fabrics and wet nonwoven fabrics made of synthetic fibers such as polyvinyl alcohol and rayon.

The non-skin contact surface layer 2b is formed of an absorbent sheet containing at least bulky cellulose fibers. It is important that the absorbent sheet has high absorbency and high permeability, and in order to obtain such an absorbent sheet, it is necessary to mix cellulose fibers having a high hydrophilicity and a bulky structure to form an absorbent sheet. The important point is to laminate and integrate the absorbent sheet and the surface material.

Further, the above-mentioned bulky cellulose fiber is
It is rich in bulkiness and has good absorbability and permeability, and when it is dehydrated / dried like in the conventional wet papermaking of pulp, a cooperative tightening force by hydrogen bond works between the fibers to make the fibers dense. Not too much, that is, controlling the tightening force between the cellulose fibers during wet papermaking of the non-skin contacting surface layer, and forming the bulky absorption space, the liquid absorption and the liquid permeability have conflicting characteristics, respectively. Realized and maintained, the fiber space structure of the entire absorbent sheet is designed and idealized.

As the above-mentioned bulky cellulose fiber,
For example, the following cellulose fibers and the like can be mentioned. The fiber shape has twist structure, crimp structure, bending and / or
Alternatively, a cellulose fiber having a three-dimensional structure such as a branched structure. Here, the twist structure means a structure in which the fiber is twisted in the length direction of the fiber, and the number of twists is
It is preferably 2.0 / mm or more. Further, the crimp structure means a structure in which the fibers are crimped in a spiral shape in the length direction of the fibers, and the bent structure means a structure in which the fibers are bent in the length direction of the fibers. The term “branched structure” means a structure in which fibers are branched. The fiber cross section is extremely thick, specifically, the fiber roughness is preferably 0.3 to 2 mg / m, more preferably 0.33 to 1 mg / m.
Is a cellulose fiber. Cellulose fibers having a fiber roughness of less than 0.3 mg / m are thin and supple, and therefore cannot exhibit bulkiness and have insufficient permeability when an absorbent sheet is prepared. The effect of cross-linking does not sufficiently appear even if the cross-linking is performed. On the other hand, in the case of cellulose fibers having a fiber roughness of more than 2 g / m, the rigidity becomes high and the structure between the fibers is disturbed during the production of the absorbent sheet. It is preferable to have a fiber roughness within the above range, because the absorption of body fluid from the surface layer becomes insufficient.

That is, in the above-mentioned bulky cellulose fiber used in the present invention, it has a three-dimensional shape in the length direction of the fiber as described above, or the fiber cross section is extremely thick as described above. Is an essential requirement for obtaining an absorbent sheet having high absorbency and liquid permeability.

As the material of the above-mentioned bulky cellulose fiber, any of the above-mentioned cellulose fibers can be used without any particular limitation. Specifically, natural cellulose such as pulp and cotton, rayon, Examples include regenerated cellulose fibers such as cupra, and these fibers can be used alone or in combination of two or more kinds. Among these, preferably, regenerated cellulose fibers whose fiber cross-sectional area and cross-sectional shape can be freely adjusted, mercerized pulp having a swelled fiber cross-section and crosslinked pulp having a bulky structure, and the like, and particularly crosslinked pulp is It is desirable because it expresses the most bulky structure and can be obtained at low cost.

When regenerated cellulose fibers such as rayon and cupra are used as the above-mentioned cellulose fibers, the fiber roughness is 0.3 to 2 mg / m depending on the spinning nozzle diameter and the spinning speed / drawing speed. It is preferable to use it as the range. When regenerated cellulose fibers are used, since the regenerated cellulose fibers have a uniform thickness in the length direction of the fibers, the fiber roughness may be calculated from denier. Further, in the case where the thickness of the fibers is not uniform in the length direction, such as natural pulp, the fiber roughness meter (F
S-200, manufactured by KAJAANI ELECTRONICS LTD.) Is preferably used to measure the fiber roughness and to use fibers having a fiber roughness within the above range.

Further, in the above-mentioned cellulose fibers, and especially in the above-mentioned cellulose fibers, the closer the cross-sectional shape of the above-mentioned cellulose fibers is to a perfect circle, the smaller the resistance against movement of body fluid to the absorbent body. Is preferred. Specifically, it is preferable that the circularity of the cross section of the cellulose fiber is 0.5 or more.

As the bulky cellulose fiber, it is possible to use a cellulose fiber obtained by crosslinking pulp having a fiber roughness of 0.3 mg / m or more. Most of the conventional wood pulp fibers have a fiber roughness of 0.3 mg.
/ M, and even if an absorbent sheet is manufactured with such pulp fibers, only those having insufficient permeability are obtained, and
Although the effect of cross-linking was insufficiently expressed even when the pulp fibers were cross-linked, the results of the research conducted by the present inventors showed that pulp fibers having a fiber roughness of 0.3 mg / m or more were further cross-linked with a cross-linking agent. Therefore, it was found that the above-mentioned effects can be further improved. Examples of the pulp having a fiber roughness of 0.3 mg / m or more include kraft pulp NBKP (trade name; "ALBACEL", manufactured by Federal Paper Board Co.) and (trade name: "INDORAYON", PT Inti Indorayon Utama
Manufactured) and the like.

Further, the cross section of wood pulp fibers such as hardwood pulp and softwood pulp generally used as pulp has a flat cross section due to delignification treatment, and most of the cross sections have a roundness of 0. Since it is less than 0.5, as the above-mentioned cellulose fiber having a circularity of 0.5 or more, a cellulose fiber whose fiber cross section is swollen by a mercerization treatment is preferably used. The mercerized pulp is obtained by, for example, mercerizing the above-mentioned pulp having a fiber roughness of 0.3 mg / m or more to increase the circularity of the cross section, and then subjecting the mercerized pulp to a crosslinking treatment with a crosslinking agent or a commercially available mercerized pulp. What was crosslinked with the agent can be used. As the above mercerized pulp, (trade name: "FILTRANIER", ITT Rayonier
Made by Inc.) (Product name: "POROSANIER", ITT Rayonier I
nc.) and the like.

The fiber roughness and the roundness of the fiber cross section can be measured by the methods described below.

In order to maintain a bulky structure in the above-mentioned and the above-mentioned cellulose fibers even in a wet state, the cellulose fibers and the molecules are cross-linked with the above-mentioned suitable cross-linking agent,
Crosslinked cellulose fibers having an improved elastic modulus when wet are particularly preferably used.

Specific examples of the cross-linking agent include N-methylol compounds such as dimethylol ethylene urea and dimethylol dihydroxy ethylene urea, polycarboxylic acids such as citric acid, tricarballylic acid and butane tetracarboxylic acid, and polycarboxylic acids. Examples thereof include glycidyl ether compound crosslinking agents. In particular, a crosslinking agent of a polycarboxylic acid or a polyglycidyl ether compound that does not generate formalin, which is harmful to the human body during crosslinking, is desirable, and a crosslinked pulp using such a crosslinking agent is preferably used as a bulky cellulose fiber. it can.

The amount of the cross-linking agent used is 0.2 to 100 parts by weight of the cellulose fibers to be cross-linked.
It is preferably 20 parts by weight. If the amount is less than 0.2 parts by weight, the crosslink density is low, so that the elastic modulus when wet becomes large, and the effect of crosslinking becomes insufficient. On the contrary, if the amount exceeds 20 parts by weight, the cellulose fibers become too rigid and the stress is increased. Since the fiber becomes brittle when subjected to the stress, it is preferable to set it within the above range.

The above-mentioned absorbent sheet can be easily obtained by using the above-mentioned bulky cellulose fiber according to a usual method for manufacturing an absorbent sheet.

Further, it is important that the absorbent sheet has a high absorbency and a high permeability, and specifically, the creme absorption height after 1 minute with respect to physiological saline (the measuring method will be described later). Preferably 30 to 70 mm, more preferably 3
The creme absorption height after 10 minutes (measurement method will be described later) is preferably 40 to 120 mm, more preferably 50 to 100 mm. When the creme absorption height after 1 minute is less than 30 mm and when the creme absorption height after 10 minutes is less than 40 mm, the ability to absorb body fluid from the surface side is insufficient and the liquid residue deteriorates. On the contrary, when the creme absorption height after 1 minute exceeds 70 mm and when the creme absorption height after 10 minutes exceeds 120 mm, the body fluid is too diffused and the surface fluid spreads too much. However, it is preferable that the content is within the above range because it may lead to leakage.

Also, the absorbent sheet preferably has a passage time (the measuring method will be described later) of 50 g or less, more preferably 5 to 40 seconds, when 10 g of an 85% by weight aqueous glycerin solution is used. Also, glycerin 85
When the passage time of 10 g of the wt% aqueous solution exceeds 50 seconds, the liquid permeability is poor and the absorption rate and the liquid residue on the surface are deteriorated. Therefore, it is preferably within the above range.

As the absorbent sheet having high absorbency and excellent liquid permeability, at least a) the bulky cellulose fiber is preferably 50 to 98% by weight, more preferably 70 to 98% by weight. And b) the hot-melt adhesive fiber is preferably 2 to 30% by weight, more preferably 2 to
Preferable examples include a wet absorbent paper obtained by mixing 20% by weight and making a paper with a basis weight of 20 to 60 g / m ² .
As the method of mixing and papermaking, a generally known method can be adopted without any particular limitation. When the above-mentioned bulky cellulose fiber is less than 50% by weight, the permeation rate of the absorbent paper obtained is insufficient, and when it exceeds 98% by weight, it is difficult to form a sheet, so that it is preferably within the above range, Further, if the heat-melting adhesive fiber is less than 2% by weight, the strength of the absorbent paper is insufficient and it becomes difficult to form a sheet. If it exceeds 30% by weight, the permeability of the absorbent sheet may decrease. Therefore, it is preferably within the above range.

As the above-mentioned heat-meltable adhesive fibers, fibers which are melted by heating and adhere to each other are used. Specifically, for example, olefin fibers such as polyethylene, polypropylene, polyester and polyvinyl alcohol; polyethylene- Particularly preferred examples include polypropylene composite fibers, polyethylene-polyester composite fibers, body melting point polyester-polyester composite fibers, polyvinyl alcohol-polypropylene composite fibers having a hydrophilic fiber surface, polyvinyl alcohol-polyester composite fibers, and the like.

In addition to the crosslinked cellulose fibers and the heat-meltable adhesive fibers, other components may be mixed in the absorbent sheet. The other components include softwood pulp,
Other pulps such as hardwood pulp and straw pulp, and dialdehyde starch and sponge as a strong auxiliary can be mentioned.

In order to laminate and integrate the skin-contacting surface layer and the non-skin-contacting surface layer, there is no particular limitation as long as it is a method of integrating the perforated film or the nonwoven fabric with the absorbent sheet. However, for example, a method of integrating an apertured film or a nonwoven fabric with an absorbent sheet by embossing, a pressure-sensitive adhesive represented by hot melt or the like, a method of integrating with an adhesive, an apertured film in a papermaking process of an absorbent sheet or Using a method of laminating and integrating a non-woven fabric and a paper-made absorbent sheet, and a wet multi-layer papermaking process, first make a first paper (nonwoven fabric) with a composition consisting of synthetic fibers, and then use the above-mentioned bulkiness in the second papermaking process. As long as it is a method of laminating and integrating both, such as a method of making a second papermaking (absorbent sheet) with a composition containing a functional cellulose fiber and laminating and integrating both It can be used in any manner in the range satisfying. In addition, as the above-mentioned method, it is also possible to employ a method in which these are used alone or in combination, for example, the above and are combined and laminated and integrated in a wet process, and then heat embossing is further performed.

Further, as a method of the above-mentioned laminated integration,
A method in which a perforated film or a nonwoven fabric and an absorbent sheet are combined and composite-integrated, and then both are heat-melted by heat embossing or the like in a drying process so that they are laminated and integrated,
Using a multi-layer papermaking process, a non-woven fabric made of synthetic fibers forming a skin contact surface layer is made into paper, then an absorbent sheet containing bulky cellulosic fibers is secondly made, and both are laminated at once in one go. Since the bulky cellulose fibers in the absorbent sheet forming the non-skin contacting surface layer are more closely entangled with each other in the skin contacting surface layer, the obtained surface agent can more smoothly guide the body fluid to the absorbent body. Can be employed particularly preferably.

Next, another example of the absorbent article of the present invention will be described with reference to FIGS. 3 and 4. Regarding the points not particularly described in detail, the explanations given in the examples shown in FIGS. 1 and 2 described above are appropriately applied. In a sanitary napkin 1 as another example of the absorbent article of the present invention shown in FIG. 3, a surface material 2 has a skin contact surface layer 2a and a non-skin contact surface layer 2b as shown in FIG. And a non-skin contact surface layer 2b (on the non-skin contact surface side) which is a liquid permeable sheet in which a permeation absorbent paper 2c as a third layer is integrally laminated, and the surface material 2 serves as an absorber. Completely covered with the superabsorbent polymer 3b. That is, in the sanitary napkin 1 shown in FIG. 3, the surface material and the absorbent body are integrally formed by the liquid permeable sheet and the superabsorbent polymer. As shown in FIG. 3, in the absorbent article of the present invention, the surface material is 3
It is particularly preferable that the liquid permeable sheet is formed by laminating and integrating layers, and the liquid permeable surface material and the super absorbent polymer are combined to form one liquid permeable sheet and a plurality of super absorbent polymers. Therefore, it is most preferable to form the surface material and the absorber.

That is, with the structure shown in FIG. 3, the surface material to the superabsorbent polymer can be completely integrated, and blood is not left on the surface under any wearing condition, and blood is smoothly transferred. The absorbent article can be guided and fixed, and can be a simpler, ultra-thin and highly absorbent absorbent article.

The permeation-absorption paper used as the third layer is a sheet for preventing the super-absorption polymer from falling through the liquid-permeable sheet even when the super-absorption polymer is wrapped and integrated. Specifically, at least
The hydrophilic fine fibers are included, and the fibers of the liquid-permeable sheet are made dense to prevent the fibers from falling off. More specifically, as the permeation absorbing paper, hydrophilic fine fibers, preferably 40-
100 parts by weight, more preferably 50 to 80 parts by weight, cellulose fibers preferably 60 to 0 parts by weight of bulky, more preferably at least mixed 50-20 parts by weight, the basis weight preferably 10 to 50 g / m ^2, More preferably 10-3
An absorption paper obtained by making paper at 0 g / m ² is preferable.

The above-mentioned bulky cellulosic fibers increase the substantial amount of space in the permeation absorbent paper, and the blending amount is such that the hydrophilic fine fibers do not become too dense and the transmissibility of blood to the polymer is hindered. Can be a small amount. Further, when the bulky cellulose fiber exceeds 60 parts by weight, the interfiber distance becomes too large and polymer leakage occurs. Therefore, it is preferable to set the content within the above range.

As the hydrophilic fine fibers, fibers having a hydrophilic surface and a large surface area, preferably having a fiber roughness of less than 0.2 mg / m and a roundness of a cross section of 0.5. Hydrophilic fibers that are less than or less than 1.0
A hydrophilic fiber having a m ² / g or more is preferably mentioned, and specifically, there is no particular limitation as long as it has the above physical properties,
Pulp fibers, cotton, cellulose fibers typified by rayon, hydrophilic synthetic fibers such as acrylonitrile, polyvinyl alcohol, and the like can be used. Among these, only one kind may be used, or several kinds may be mixed and used. . Above all,
Pulp fiber can be used preferably because it is available at a very low cost and the fiber surface area can be controlled by beating conditions. For example, "kraft pulp NBKP"
(Product name: "SKEENA PRIME", Skeena Cellelose Co.
Finely beaten and "LBKP" (trade name;
Examples include "PRINCE ALBERT ASPEN HARDWOOD", manufactured by Wawerwood Paper Co., Ltd., and straw pulp.

As the above-mentioned superabsorbent polymer in this case, generally known superabsorbent polymers can be used without any particular limitation, and the blending amount of the superabsorbent polymer is 20 to 500 g / scattered basis weight. m ² , more preferably 30 to 3
It is preferably set to 00 g / m ² .

In the above description, the sanitary napkin is used as the absorbent article, but the present invention is not limited to these, and is applied to, for example, disposable diapers, incontinence pads, breast milk sheets and the like. can do.

Next, the absorbent article of the present invention will be specifically described based on Examples and Comparative Examples. First, the liquid-permeable surface materials (A) to (H) used in Examples and Comparative Examples were prepared in the following manner.

[Liquid-permeable surface material (A)] A low-density polyethylene (manufactured by Mitsui Petrochemical Co., Ltd.) is extruded from a T die to form a molten resin, which is composed of a wire 11a shown in FIGS. 5 (A) and 5 (B). By extruding onto the spiral braided wire net 11 and treating with hot air while sucking, a hole is formed in a shape that follows the surface shape of the wire net 11 and at a position corresponding to the space of the wire rod 11a of the wire net 11 (the back side is a void). The polyethylene perforated film shown in FIGS. 6 (A) and 6 (B) having a large number of tops 35 having a convex curved surface and a large number of holes 34 was obtained.

On the other hand, mercerized pulp having a fiber roughness of 0.36 mg / m and a roundness of the fiber cross section of 0.80 (trade name; "Porosenia-J", manufactured by ITT RAYONIER INC.) 10
5 g of dimethylol dihydroxyethylene urea (trade name: “Sumitex Resin NS1-19”, manufactured by Sumitomo Chemical Co., Ltd.) as a cross-linking agent, and a metal salt catalyst (trade name; “Sumitex Accelerator X- 110 "manufactured by Sumitomo Chemical Co., Ltd.) was dispersed in 1000 g of an aqueous solution of a crosslinking agent containing 3% by weight to impregnate the crosslinking agent. Then, the amount of the aqueous solution of the crosslinking agent based on the mercerized pulp is 100%.
(Ie, the content of the aqueous solution of the cross-linking agent in the mercerized pulp is 100 g), the aqueous solution of the cross-linking agent is released from the mercerized pulp, and then heated in an electric dryer at 135 ° C. for 10 minutes to obtain the cellulose in the pulp. Was cross-linked to obtain mercerized cross-linked pulp, which is a bulky cellulose fiber.

95 parts by weight of the obtained mercerized crosslinked pulp
And polyvinyl alcohol as a heat-melting adhesive fiber
[(PVA): Product name; "Fibribond", Sansho
Co., Ltd.] and 5 parts by weight are dispersed and mixed in water, respectively.
After paper, dry and basis weight 40g / m ²Absorbed on paper
Got the sheet. A circular pattern with a diameter of 2 mm is 1 cm²Hit
Heat the embossing roll with 2 rolls to a temperature of 110 ° C.
Then emboss the polyethylene aperture film and absorbent sheet
The liquid permeable surface material shown in FIG.
(A) was obtained.

The fiber roughness and the roundness of the fiber cross section of the above cellulose fiber (mercerized pulp) are measured by the following methods.

<Measurement of Fiber Roughness> In order to obtain the average fiber thickness of fibers having a non-uniform fiber cross section such as pulp, a fiber roughness meter FS-200 (KAJAANI ELECTRONICS LT
(Manufactured by D.). First, in order to obtain the true weight of the sample, the sample is dried in a vacuum dryer at 100 ° C. for 1 hour to evaporate the water content in the fiber. Accurately take about 1 g of the fiber with an accuracy of ± 0.1 mg to obtain a sample weight M. The fibers are then placed in a mixer attached to the fiber roughness meter to prevent damage to the fibers of the sample.
Disintegrate completely in ml of water, dilute this to 5000 ml, accurately measure 50 ml from the resulting diluted solution, use this as the solution for measuring fiber roughness, and follow the operating procedure of the fiber roughness meter above. The fiber roughness was determined.

<Measurement of Roundness of Fiber Cross Section> The roundness of the fiber cross section is measured by first slicing the fiber cross section vertically so that the area does not change, and taking a cross-sectional photograph by an electron microscope. The photograph was analyzed by an image analyzer (trade name "Avio EXCEL" manufactured by Nippon Avionics Co., Ltd.), and the roundness of the fiber cross section was determined using the formula shown in [Formula 4] below. still,
The roundness was an average value obtained by measuring 100 points on an arbitrary fiber cross section.

[Liquid-permeable surface material (B)] Using a polyethylene / polypropylene composite fiber (manufactured by Chisso Corporation) having a thickness of 2 denier and a length of 38 mm, a dry heat-bonding nonwoven fabric having a basis weight of 25 g / m ² was prepared. Manufactured. Next, the absorbent sheet used in the liquid-permeable surface material (A) and the dry heat-bonded nonwoven fabric are laminated and integrated by an embossing roll similarly to the liquid-permeable surface material (A), and the liquid shown in FIG. A transparent surface material (B) was obtained.

[Liquid-permeable surface material (C)] The fiber roughness is 0.
Softwood Krato pulp with 35 mg / m and roundness of fiber cross section of 0.28 (trade name: "INDORAYON", PT Inti In
Dorayon Utama) as a cross-linking agent, dimethylol dihydroxyethylene urea (trade name; "Sumitex Resin NS
-19 ", 5% by weight of Sumitomo Chemical Co., Ltd., and 5% by weight of a metal salt catalyst (trade name;" Sumitex Accelerator X-110 ", Sumitomo Chemical Co., Ltd.) in a crosslinking agent aqueous solution. And impregnated with the crosslinking agent.

Next, after the aqueous solution of the crosslinking agent is separated from the kraft pulp until the aqueous solution of the crosslinking agent with respect to the softwood kraft pulp reaches 100%, it is placed in an electric dryer 13
The mixture was heated at 5 ° C. for 10 minutes to cross-link the cellulose in the pulp fiber to obtain bulky cellulose fiber (cross-linked pulp). 98 parts by weight of the bulky cellulose fiber obtained and polyethylene terephthalate (hereinafter referred to as PET) having a thickness of 1.1 denier and a length of 5 mm as a heat-melting adhesive fiber (trade name; "TMOTNSB" Teijin Ltd. )) 10 parts by weight were dispersed and mixed in water to obtain a wet absorbent paper having a basis weight of 40 g / m ² . In addition, a polyethylene / polypropylene composite fiber with a thickness of 2 denier and a length of 38 mm (Chisso Corporation)
Manufactured in advance, a dry heat-bonded nonwoven fabric having a basis weight of 25 g / m ² is manufactured in advance, and the dry heat-bonded nonwoven fabric and the wet absorbent paper are compositely laminated before drying in a paper machine, and a dry dryer is used. The liquid-permeable surface material (C) shown in FIG. 2 was obtained by allowing it to pass through and laminating and integrating by heat fusion.

[Liquid-permeable surface material (D)] As a nonwoven fabric layer made of synthetic fibers, a polyester fiber having a thickness of 0.5 denier and a length of 5 mm [trade name: "TM04N", Teijin Ltd.]
Made of 35 parts by weight, 2.5 denier thickness, 5 mm length of polyester fiber [Product name: "N-790", Kuraray Co., Ltd.
Manufactured] 45 parts by weight, as a heat-melting adhesive fiber, thickness 1.5
Denier, 5 mm long polypropylene (core) -vinyl acetate (sheath) composite fiber [Product name: "EA", Chisso Corporation] 2
And 0 part by weight were dispersed in water to obtain a non-woven fabric having a basis weight of 25 g / m ^{2 using} a first paper machine.

Next, in the second paper machine, 90 parts by weight of the bulky cellulose fiber (mercerized crosslinked pulp) used in the liquid permeable surface material (A) and the thickness of 1. 1 denier, 5 mm long low melting point type polyester (product; "TOMOTNSB", Teijin Ltd.) 10 parts by weight are dispersed in water, respectively, and an absorbent sheet having a basis weight of 40 g / m ^{2 with} a second paper machine. Paper making, first
The nonwoven fabric obtained with a paper machine was laminated and heat-fused in a drying step of the paper machine to laminate and integrate to obtain a liquid-permeable surface material (D) shown in FIG.

[Liquid-permeable surface material (E)] As a non-woven fabric layer layer made of synthetic fibers, the same composition as that used for the liquid-permeable surface material (D) was used. Quantity 2
A non-woven fabric of 5 g / m ² was obtained. Next, in a second paper machine, as bulky cellulose fibers, 90 parts by weight of cross-linked pulp having a twist structure (trade name; "High Bulk Additive", manufactured by Waewowa Paper Co., Ltd.), as hot-melt adhesive fibers , 1.1 denier, 5 mm long, low melting point type polyester (trade name; "TOMOTNSB", Teijin Ltd.) 10 parts by weight are dispersed in water, and the basis weight of the second paper machine is 40 g / It was a paper absorbent sheet of m ^2. Then, in a third paper machine, as bulky cellulose fibers, a cross-linked pulp having a twist structure (trade name: “High B
"ulk Additive", manufactured by Waferuser Paper Co., Ltd. 30
Softwood kraft pulp NBKP with parts by weight and fiber roughness of 0.18 mg / m and roundness of fiber cross section of 0.32
(Product name: "SKEENA PRIME", Skeena Cellulise Co.
70 parts by weight are dispersed in water to obtain a basis weight of 20 g /
Papermaking The absorptive paper m ^2, a nonwoven fabric made of paper and synthetic fibers in the first paper machine, the absorbent paper obtained by paper sequentially laminated with the absorbent sheet and the third paper machine were paper in the second paper machine, paper machine In the drying step, they were laminated and integrated to obtain a surface material (E) shown in FIG.

[Liquid-permeable surface material (F)] Softwood kraft pulp NBKP (trade name; "SKEENA PRI" having a fiber roughness of 0.18 mg / m and a roundness of the fiber cross section of 0.32).
ME ", manufactured by Skeena Cellulise Co.) was dispersed in water to obtain an absorbent sheet having a basis weight of 40 g / m ² . Then, the polyethylene perforated film used for the liquid-permeable surface material (A) and the above-mentioned absorbent sheet were not laminated and integrated, but a simple laminate of two sheets was used as the liquid-permeable surface material (F). This sheet does not use an absorbent sheet containing bulky cellulose fibers, and does not have an apertured film and an absorbent sheet laminated and integrated.

[Liquid-permeable surface material (G)] 25 g / m 2 of denier and 38 mm long polyethylene / polypropylene composite fiber (manufactured by Chisso Corp.)
A dry heat-bonded nonwoven fabric of ² was obtained. Then, the fiber roughness is 0.
Softwood kraft pulp NBKP (trade name; "SKEENA PRIM" at 18 mg / m and a roundness of fiber cross section of 0.32)
E ", manufactured by Skeena Cellulise Co.) was dispersed in water to obtain an absorbent sheet having a basis weight of 40 g / m ² . Similar to the liquid-permeable surface material (A), the nonwoven fabric and the absorbent sheet were laminated and integrated by an embossing roll to obtain a liquid-permeable surface material (G). This sheet does not use an absorbent sheet containing bulky cellulose fibers.

[Liquid-permeable surface material (H)] Basis weight of 25 g / m2 produced using polyethylene / polypropylene composite fiber (manufactured by Chisso Corporation) having a thickness of 2 denier and a length of 38 mm.
A dry heat-bonded nonwoven fabric of ² was obtained. Then, the fiber roughness is 0.
95 parts by weight of rayon (manufactured by Daiwabo Rayon Co., Ltd.) having a length of 077 mg / m and a length of 11 mm, polyvinyl alcohol (trade name; “Fibribond”, as a hot-melt adhesive fiber)
5 parts by weight of Sansho Co., Ltd. were dispersed in water to obtain a rayon wet non-woven fabric having a basis weight of 40 g / m ² . Next, the dry non-woven fabric and the rayon non-woven fabric were laminated and integrated by a spiral hot melt having a basis weight of 10 g to obtain a liquid-permeable surface material (H). This sheet does not use an absorbent sheet containing bulky cellulose fibers.

Next, the absorptivity and liquid permeability of the absorbent sheet 2b of the obtained liquid permeable surface materials (A) to (H) were evaluated. As the evaluation of absorbability,
The Klem absorbency test for evaluating the pulling force of the liquid from the apertured film or the nonwoven sheet, and the passage time of the aqueous glycerin solution for evaluating the transmissibility of the liquid to the absorber are measured by the method shown below. did. The results are shown in [Table 1].

Incidentally, the measurement was performed not after the lamination and integration but with the absorbent sheet 2b alone. Further, since the surface materials (C), (D) and (F) are laminated and integrated in a wet process, only the absorbent sheet 2b to be integrated with the surface material on the skin side was subjected to paper evaluation. As for the surface material (E), three layers are laminated and integrated as shown in FIG. 4, and the physical properties of the absorbent sheet 2b for combining the surface material on the skin side are important. Was evaluated.

<Crem absorption height (after 1 minute and 10 minutes)
> The Krem absorption height was measured using the apparatus shown in FIG.
First, the absorbent sheet was cut into a length of 300 mm and a width of 20 mm to prepare a measurement piece 30 shown in FIG. Next, as shown in FIG. 7, the measurement piece 30 was hung so that the support 31 had no slack, and the upper and lower ends were fixed. Also, 300 × 1
The physiological saline 33 was used as a measuring solution to a height of 40 mm in a rectangular parallelepiped container 32 of 00 × 50 mm (length × width × depth), and the measuring piece 30 was immersed in the physiological saline 33. Then, 1 minute after the measurement piece 30 was dipped, the height of the measurement liquid absorbed by the measurement piece 30 from the liquid surface and the height of the measurement piece 30 absorbed from the liquid surface after 10 minutes were measured. Performs the same respective 10 points of measurement were the absorption height h ₁₀ of the average absorption height after 1 minute of each taking a value h _1, and after 10 minutes saline 33.

<Measurement of transit time> The measurement of the transit time was performed using the measuring device shown in FIG. First, the absorbent sheet is cut into a length of 50 mm and a width of 50 mm to prepare a measuring piece 40, and then the measuring piece 40 is clamped and fixed from both upper and lower sides by glass tubes 41 having an inner diameter of 35 mm as shown in FIG. did. At this time, so that the liquid does not seep out from the side during measurement,
It fixed from both sides with the clip (not shown) through the silicone rubber 42. Glycerin 85% aqueous solution 4
10 g of 3 was placed in a 10 ml beaker 44 and gently poured into a glass tube 41. After injecting the glycerin 85% aqueous solution 43, the time until 50% or more of the surface of the measurement piece appeared with respect to the open area of the glass tube 41 was determined, and this was defined as the passage time of the solution. In addition, measurement liquid (85% glycerin aqueous solution)
Was adjusted as follows. After mixing 15 g of ion-exchanged water with 85 g of glycerin (manufactured by Wako Pure Chemical Industries, Ltd.),
0.01 g of Edible Blue No. 1 (manufactured by Tokyo Chemical Industry Co., Ltd.) was added to give a blue color.

[0069]

[Table 1]

Next, in the following Examples 1 to 5, sanitary napkins as absorbent articles of the present invention were manufactured using the obtained surface materials (A) to (E). In addition, in the following Comparative Examples 1 to 3, the obtained surface materials (F) to (H) were used to manufacture a sanitary napkin as a comparative product.

Example 1 As shown in FIG. 1, a basis weight of 150
Density 0.15 g / cm ³ in g / m ² , thickness 1 mm, length 17
On the fluff pulp 3a adjusted to 5 mm and width 73 mm,
Superabsorbent polymers 3b (AQUALIC CA-W4S, Nippon Shokubai Co., Ltd.) 0.5g, from a basis weight 39g / m ² and consisting sprayed as, this softwood kraft pulp basis weight 18 g / m ² The prepared wet absorbent paper 3c was overlaid to prepare an absorbent body 3 having a length of 175 mm and a width of 73 mm and having the structure shown in FIG. The obtained absorber 3 is 205 mm in length and 130 in width.
Wrapped with liquid permeable surface material (A) cut into mm, and further formed into a film with a basis weight of 30 g / m ² , a length of 205 mm,
Overlay the polyethylene back sheet 4 with a width of 95 mm,
The fixing agent 5 was fixed using a hot melt adhesive.
Further, ^two hot-melt adhesives 6 having a basis weight of 40 g / m ² , a width of 20 mm and a length of 115 mm were coated on the back surface side of the polyethylene backsheet 4 with a sanitary napkin shown in FIG. Item 1) was obtained. Incidentally, reference numeral 7 in the figure is a release paper coated with a slip preventive agent.

Example 2 FIG. 1 was carried out in the same manner as in Example 1 except that the liquid-permeable surface material (A) used in Example 1 was replaced with the liquid-permeable surface material (B). A sanitary napkin (invention product 2) having the constitution shown was prepared.

Example 3 FIG. 1 was carried out in the same manner as in Example 1 except that the liquid permeable surface material (C) was used in place of the liquid permeable surface material (A) used in Example 1. A sanitary napkin (invention product 3) having the constitution shown was prepared.

Example 4 FIG. 1 was carried out in the same manner as in Example 1 except that the liquid-permeable surface material (D) was used in place of the liquid-permeable surface material (A) used in Example 1. A sanitary napkin (invention product 4) having the constitution shown was prepared.

[Embodiment 5] As shown in FIG.
mm, width 150 mm, liquid-permeable surface material (E) on basis weight 10 g
/ M ² , width 80mm, apply spiral hot melt,
On top of that, super absorbent polymer 3b (trade name Aqualic C
A-W4S, manufactured by Nippon Shokubai Co., Ltd., 0.5g in width 73
mm, length 175 mm, spread almost evenly, width 75 mm
Bend with and wrap the polymer to integrate. Furthermore, 205 mm in length formed into a film with a basis weight of 30 g / m ² ,
Overlay the polyethylene back sheet 4 with a width of 95 mm,
The fixing agent 5 was fixed using a hot melt adhesive.
Furthermore, ^two hot-melt adhesives 6 having a basis weight of 40 g / m ² , a width of 20 mm and a length of 115 mm were coated on the back side of the polyethylene back sheet 4 as a pressure-sensitive adhesive, and the sanitary napkin shown in FIG. The product 5) was obtained. Incidentally, reference numeral 7 in the figure is a release paper coated with a slip preventive agent.

Comparative Example 1 FIG. 1 is carried out in the same manner as in Example 1 except that the liquid permeable surface material (F) was used in place of the liquid permeable surface material (A) used in Example 1. A sanitary napkin (Comparative Product 1) having the constitution shown was prepared.

Comparative Example 2 FIG. 1 is carried out in the same manner as in Example 1 except that the liquid-permeable surface material (G) was used in place of the liquid-permeable surface material (A) used in Example 1. A sanitary napkin (Comparative Product 2) having the structure shown was prepared.

Comparative Example 3 FIG. 1 is carried out in the same manner as in Example 1 except that the liquid permeable surface material (H) was used in place of the liquid permeable surface material (A) used in Example 1. A sanitary napkin (Comparative Product 3) having the structure shown was prepared.

Then, the performance evaluation was performed on the sanitary napkins obtained in the examples and comparative examples. That is, Example 1
About the absorption performance of the present invention products 1 to 5 and the comparative products 1 to 3 of Comparative Examples 1 to 5, the absorption time, the evaluation of the surface slat feeling and the leakage test were performed by the following methods. The respective results are shown in [Table 2] below.

(1) Measurement of Absorption Time As shown in FIG. 9, the sanitary napkins 80 obtained in Examples and Comparative Examples were placed horizontally, and an acrylic plate 82 with an injection port 81 having a diameter of 10 mm was placed thereon. A weight 83 is placed on the test sanitary napkin 80 so that a load of 5 g / cm ² is applied. Next, 6 g of defibrinated horse blood (manufactured by Japan Biotest Institute Co., Ltd.) is injected from the injection port, and the absorption time (second) until the liquid is completely absorbed is determined. The measurement was carried out at a total of 5 points, and the average value of each was determined and used as the absorption time.

(2) Evaluation of Surface Salat Feeling Test sanitary napkins 8 obtained in Examples and Comparative Examples
As shown in FIG. 10 and FIG. 11, 0 was attached to the movable female waist model 90, shorts were put on, and then walking was carried out for 10 minutes at a walking speed of 100 steps / minute (50 m / minute).
Then, while walking, inject 3 g of defibrinated horse blood into the sanitary napkin 80 with a tube, and then perform 2 at the same speed.
After walking for 0 minutes, the sample was taken out. The sample taken out was subjected to a sensory evaluation of the surface slatiness. ◯: There is almost no liquid residue on the surface material and there is a feeling of slat. B: Some liquid remains on the surface material. X: A large amount of liquid remains on the surface material, and it feels sticky.

(3) Leakage Evaluation Test sanitary napkins 8 obtained in Examples and Comparative Examples
0 was attached to a female waist model 90 as shown in FIG. 11, shorts were put on, and then the model was laid sideways as shown in FIG. Then, 5 g of defibrinated horse blood was injected into the sanitary napkin 80 by a tube at a rate of 1 g / min per minute, then left for 20 minutes, and then 5 g of defibrinated horse blood was injected at the same rate, It was left for 20 minutes again. At each time point, the number of leaks out of 10 samples was counted.

[0083]

[Table 2]

As is clear from the results shown in [Table 2],
The absorbent article of the present invention, the surface material, the skin contact surface layer is a non-woven fabric layer consisting of an apertured film or synthetic fibers, the non-skin contact surface layer at least containing bulky cellulose fibers,
It is a highly absorbent and highly permeable absorbent sheet, and because it consists of a liquid permeable sheet that is made by laminating both of them, the absorption time is fast and body fluid is quickly guided to the absorbent body.
There is little liquid left on the surface, and the feeling of salat is high. In addition, in the leak evaluation in the sleeping position, without flowing over the surface,
Blood can be smoothly guided to the absorber without leakage.

On the other hand, in Comparative Products 1 to 3 which do not satisfy the requirements of the present invention, Comparative Product 1 of Comparative Example 1 in which the sheet of the skin contacting surface layer and the absorbent sheet for absorbing blood are not laminated and integrated, Body fluid floats on the surface material, and blood flows and leaks on the surface material. In addition, Comparative Products 2 and 3 of Comparative Examples 2 and 3
In, the nonwoven fabric made of synthetic fibers and the absorbent sheet are laminated and integrated, but since the absorbent sheet does not contain bulky cellulose fibers, the liquid permeability of the absorbent sheet is low, the absorption time is slow, and the surface is Since the force of drawing blood from the material and the transferability of blood to the absorber are low, the feeling of slat on the surface is low and the liquid leakage property in the sleeping state is also low.

Further, as in the case of the product 5 of the present invention, a liquid permeable material in which a perforated film or non-woven fabric and an absorbent sheet containing bulky cellulose fibers are integrated with a permeable absorbent paper having a higher absorptivity. When the sheet is used as the surface material, an absorbent article can be formed only by the liquid-permeable sheet, the superabsorbent polymer and the leak preventer, and an extremely thin and high-performance absorbent article can be obtained with an extremely simple structure. To be

[0087]

INDUSTRIAL APPLICABILITY The absorbent article of the present invention is one in which the surface material and the absorbent sheet are not separated from each other, the surface liquid remains always small, and the liquid absorbent is excellent in stickiness. That is, the absorbent article of the present invention, as a liquid-permeable surface material,
A liquid in which an apertured film or a non-woven fabric layer is used for the skin-contacting surface layer, and an absorbent sheet containing bulky cellulose fibers having high absorbency and high liquid permeability is used for the non-skin-contacting surface layer, and both are laminated and integrated. Since the permeable sheet is used, when the excreted body fluid permeates the skin contact surface layer, the non-skin contact surface layer quickly absorbs the body fluid and smoothly permeates the absorbent body. Therefore, according to the absorbent article of the present invention, body fluid is guided to the absorbent body without flowing / remaining liquid on the surface material under any condition, so that the absorbent article has a high absorption performance, a high slatability, and is hard to leak. Is.

Further, a liquid permeable sheet having a three-layer structure in which a permeable and absorbent paper having a high absorbing power is laminated and integrated on the skin-contacting surface layer and the non-skin-contacting surface layer, and a highly absorbent polymer are used. ,
Since the absorbent article of the present invention, which comprises the surface material and the absorbent body, can be completely integrated from the surface material to the polymer, it does not leave blood on the surface of the surface material under any wearing condition, It is an absorbent article having a simpler structure and capable of smoothly solidifying blood by means of a superabsorbent polymer, and more resistant to leakage.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a cross section in the width direction of a sanitary napkin as an absorbent article of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a surface material in FIG.

FIG. 3 is a schematic cross-sectional view showing a cross section in the width direction of another example of the sanitary napkin as the absorbent article of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a surface material in FIG.

5A and 5B are schematic views showing a wire mesh used in manufacturing a surface material preferably used in the present invention.

FIG. 6A is a schematic view showing an example of a surface material preferably used in the present invention, and FIG. 6B is an enlarged view of a part of FIG. 6A.

FIG. 7 is a schematic view showing a device for measuring the creme absorption height.

FIG. 8 is a schematic diagram showing a device for measuring liquid permeation time.

FIG. 9 is a schematic diagram showing an outline of measurement of absorption time.

FIG. 10 is a schematic view showing a movable female waist model.

FIG. 11 is a schematic view showing the front of the movable female waist model shown in FIG. 10 with a sanitary napkin attached to the crotch region.

12 is a schematic view showing a side surface of the movable female waist model shown in FIG. 10 with a sanitary napkin attached to the crotch region.

[Explanation of symbols]

 1 Sanitary napkin 2 Surface material 2a Skin contact surface layer 2b Non-skin contact surface layer 2c Permeation absorbent paper 3 Absorber 3a Flap pulp 3b Super absorbent polymer 3c Wet absorbent paper 4 Leak preventive material 5 Fixing agent 6 Anti-slip agent 7 Release paper

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0058

[Correction method] Change

[Correction content]

Next, after the aqueous solution of the crosslinking agent is separated from the kraft pulp until the aqueous solution of the crosslinking agent with respect to the softwood kraft pulp reaches 100%, it is placed in an electric dryer 13
The mixture was heated at 5 ° C. for 10 minutes to cross-link the cellulose in the pulp fiber to obtain bulky cellulose fiber (cross-linked pulp). And 9 0 parts by weight of cellulose fibers bulkiness obtained polyethylene terephthalate length 5mm in thickness 1.1 deniers as thermally fusible bonding fibers (hereinafter referred to as PET) (trade name: "TMOTNSB" Teijin ( 10 parts by weight) were mixed and dispersed in water to obtain a wet type absorbent paper having a basis weight of 40 g / m ² . In addition, a polyethylene / polypropylene composite fiber with a thickness of 2 denier and a length of 38 mm (Chisso Corporation)
Manufactured in advance, a dry heat-bonded nonwoven fabric having a basis weight of 25 g / m ² is manufactured in advance, and the dry heat-bonded nonwoven fabric and the wet absorbent paper are compositely laminated before drying in a paper machine, and a dry dryer is used. The liquid-permeable surface material (C) shown in FIG. 2 was obtained by allowing it to pass through and laminating and integrating by heat fusion.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0065

[Correction method] Change

[Correction content]

Next, the obtained was evaluated in the absorbent and liquid permeability of said liquid-permeable surface material (A) ~ us only that the (H) above the absorbent sheet 2b. As the evaluation of the absorbability, the Krem absorbency test for evaluating the drawing force of the liquid from the apertured film or the nonwoven sheet, and the passage time of the aqueous glycerin solution for evaluating the transferability of the liquid to the absorbent body. Was measured by the method shown below. The results are shown in [Table 1].

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area A61F 13/00 351 F Z

Claims (9)

[Claims] 1. An absorbent article having a liquid-permeable surface material, a liquid-retaining absorbent material, and a liquid-impermeable leak-proof material, wherein the surface material is at least a skin contact surface layer and a non-skin contact layer. A liquid permeable sheet integrally laminated with a contact surface layer, a) the skin contact surface layer is formed of an aperture film made of a thermoplastic resin or a nonwoven fabric made of synthetic fiber, and b) the above The non-skin contact surface layer is formed of an absorbent sheet containing at least bulky cellulose fibers. 2. The absorbent sheet comprises bulky cellulose fibers in an amount of 50 to 98% by weight and heat-meltable adhesive fibers in an amount of 2 to 30.
The absorbent article according to claim 1, which is a wet type absorbent paper containing at least wt%. 3. The absorbent sheet is a wet absorbent paper containing at least 50 to 98% by weight of bulky cellulose fiber and 2 to 20% by weight of heat-meltable adhesive fiber, and the liquid permeable sheet is 3. The skin-contacting surface layer and the non-skin-contacting surface layer are compositely integrated in a wet papermaking process, and are heat-sealed to be laminated and integrated in a drying process. The absorbent article described. 4. The absorbent sheet has a creme absorption height after 30 minutes for physiological saline of 30 to 70 mm and a creme absorption height after 10 minutes of 40 to 120 mm, and further comprises 10 g of an aqueous 85% by weight glycerin solution. The absorbent article according to any one of claims 1 to 3, wherein the passage time is 50 seconds or less. 5. The bulky cellulose fiber is a cellulose fiber obtained by crosslinking pulp having a fiber roughness of 0.3 mg / m or more with a crosslinking agent.
The absorbent article according to claim 4. 6. The roundness of the fiber cross section of the pulp is 0.5.
It is above, The absorbent article of Claim 5 characterized by the above-mentioned. 7. The absorbent article according to claim 1, wherein the bulky cellulose fibers are cellulose fibers obtained by crosslinking mercerized pulp with a crosslinking agent. 8. The liquid-permeable sheet is formed by laminating and integrating the skin-contacting surface layer, the non-skin-contacting surface layer, and a third layer disposed on the surface of the non-skin-contacting surface layer. c) The absorbent article according to any one of claims 1 to 7, wherein the third layer is an absorbent sheet containing at least hydrophilic fine fibers. 9. The absorbent article according to claim 8, wherein the surface material and the absorber are integrally formed of the liquid-permeable sheet and the superabsorbent polymer.