JP2001198155A - Absorptive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive sheet achieving high odor-controlling effect without prohibiting absorption performance from which an odor-controlling agent or a water absorbing polymer is not removed almost at all. SOLUTION: This absorptive sheet at least includes the odor-controlling agent 20, and the water absorbing polymer 30. It comprises an odor-controlling layer 2 in which the odor-controlling agent 20 is mixed with fibers 21, and a water absorbing polymer layer 3 in which a part of the water absorbing polymer 30 is jointed with the odor-controlling layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorant absorbent sheet useful as an absorbent for absorbent articles such as sanitary napkins and disposable diapers, an underlay sheet for pet toilets, a drip sheet for foodstuffs, and the like. The present invention relates to an absorbent article having an absorbent sheet, a method for producing the same, and an absorbent article having the absorbent sheet in an absorbent layer.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Publication (Kokai) No. 3-11068 proposes a water-absorbent sheet in which a deodorant layer and a water-absorbing polymer layer are separated by a pulp layer. . Also, Japanese Patent Application Laid-Open No. Sho 57-14225
6, a sanitary napkin absorbent in which a pulp layer containing a water-absorbing polymer and an absorbent paper containing activated carbon are disposed adjacent to each other, or a hot-melt pressure-sensitive adhesive described in JP-A-8-281042. An odor control sheet obtained by spraying activated carbon between engineered papers and integrating them is also known. Japanese Patent Laid-Open No. 5-
Japanese Patent Publication No. 503647 proposes that a water-absorbing polymer and an antiodorant be attached to an absorbent article.

It is effective to mix a large amount of deodorants such as activated carbon, zeolite, sepiolite, and bentonite having a small particle size and a large specific surface area, which is effective as a deodorant to be used. Particles having a diameter of 250 μm or less are easily dispersed as dust, and the particles are easily aggregated, so that the sprayability is poor, and it is difficult to mix the particles by a normal spraying method. Further, these particles are easily affected by the liquid, and a liquid film is formed on the surface of the particles, so that the odor control ability is easily reduced. Further, in the absorbent sheet disclosed in the above-mentioned publication, the deodorant is always kept in a wet state, the odor component cannot be efficiently contacted with the deodorant, and the deodorant is a water-absorbing polymer. It was not sufficient to satisfy both the deodorant performance and the absorption performance, for example, by covering the periphery of the water-absorbing polymer and obstructing the absorption performance of the water-absorbing polymer. Further, there is a problem that the deodorant and the water-absorbing polymer are easily dropped off.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an absorbent sheet having a high deodorizing effect, without impairing the absorption performance, and hardly causing the deodorant and the water-absorbing polymer to fall off, a method for producing the same, and an absorbent sheet. An object of the present invention is to provide an absorbent article having an absorbent layer.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an absorbent sheet containing at least an anti-odorant and a water-absorbing polymer, and comprises an anti-odor layer in which an anti-odor agent and fibers are mixed; The object has been achieved by providing an absorbent sheet having a water-absorbing polymer layer to which a water-absorbing polymer is bonded. Further, the present invention is the method for producing an absorbent sheet according to claim 2, wherein the step of obtaining the deodorant layer by wet-making a mixed slurry obtained by dispersing and mixing the deodorant and the fiber in a liquid, A step of wet-making the support layer to obtain the support layer, wetting the deodorant layer or the support layer, spraying a water-absorbing polymer on one surface thereof and swelling the water-absorbing polymer, The object has been achieved by providing a method for producing an absorbent sheet comprising a bonding step of bringing a layer or the deodorant layer into contact with each other, drying the layer, and bonding the antiodor layer and the lower layer. Further, the present invention has a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retentive absorbing layer interposed between both layers, wherein the absorbing layer is the absorbent sheet according to claim 1. The above object has been achieved by providing an absorbent article having the above.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described. FIG. 1 schematically shows a first embodiment of the absorbent sheet of the present invention. In the figure, reference numeral 1 indicates an absorbing sheet. As shown in the figure, the deodorant layer 2 in which the deodorant 20 is mixed with the fiber 21, the water absorbent polymer layer 3 in which a part of the water absorbent polymer 30 is joined to the deodorant layer 2, and the water absorbent polymer layer 3 Water-absorbing polymer 3
Odor control layer 2 due to the adhesiveness developed in the swelling state of 0
And a support layer 4 joined to the absorbent sheet.

[0007] The details will be described below. In the absorbent sheet of the present invention, the fibers constituting the deodorant layer include fluff pulp piled up in an air stream, dry pulp sheet obtained by hardening the pulp with various binders, wet-laid paper, and various manufacturing methods. The formed nonwoven fabric can be used.

As the fiber used for the deodorant layer, ordinary pulp fiber can be used, and hydrophilic fiber which does not swell in water or centrifugal retention after equilibrium absorption swelling of water is 0.7 g / g. The following hydrophilic fibers are preferred. In the latter, the absorbed liquid can be quickly spread in the sheet without being held in the fiber, and can be brought into contact with the deodorant.
In such a sheet, it is preferable that the creme absorption rate after 1 minute with respect to water is 40 mm or more.

Examples of the constituent material of the hydrophilic fiber that does not swell in water include resins that do not swell themselves, for example, synthetic resins such as polyethylene, polypropylene, polyester, polyurethane, and composites of two or more of these. Since the surface of these synthetic resins is hydrophobic, it is necessary to perform a hydrophilic treatment. As a method of the hydrophilization treatment, after forming a fiber made of the synthetic resin, a solution of a surfactant is sprayed and applied to adhere to the surface, or a hydrophilic surfactant is previously added to the synthetic resin. Then, the fibers are molded, and the surface is bleed with a surfactant.

As the surfactant used in the hydrophilic treatment, any hydrophilic surfactant having a lipophilic group and a hydrophilic group may be used, but an anionic surfactant and an ethylene oxide-based surfactant may be used. A high number of nonionic surfactants is preferred. Specific examples include sulfosuccinates, alkyl ether sulfates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, and glycerin fatty acid esters. These surfactants can be used alone or in a mixture. Among these surfactants, those which can impart sufficient hydrophilicity when the ratio to the synthetic resin is about 0.05 to 3% by weight are preferable.

Another example of the constituent material of the hydrophilic fiber that does not swell in water is a material that does not need to be subjected to a hydrophilic treatment, that is, a material that itself has a hydrophilic surface. Specific examples include fibers and foams made of cellulose, polyvinyl alcohol, and acrylic resin, such as rayon fibers and polyvinyl alcohol fibers.

Examples of hydrophilic fibers having a centrifugal retention of 0.7 g / g or less after equilibrium absorption and swelling of water include cross-linked cellulose fibers obtained by cross-linking the inside or between the molecules of cellulose with an appropriate cross-linking agent. And polynosic rayon fibers having improved crystallinity of cellulose.
From the viewpoint of production costs, crosslinked cellulose fibers are preferred. When a hydrophilic fiber having a centrifugation retention amount of more than 0.7 g / g is used, the liquid is absorbed and retained in the fiber and becomes a source of offensive odor. The liquid tends to remain in the space, which also becomes a source of offensive odor.
The chemical pulp such as softwood pulp or hardwood pulp generally has a centrifugal retention of about 1 to 2 g / g. The method for measuring the centrifugation retention amount will be described in detail in Examples described later.

The cross-linking agent may be N-methylol ethylene urea or N-methylol hydroxyethylene urea.
-Methylol compounds, polycarboxylic acids such as tricarballylic citrate and butane teracarboxylic acid, polyglycidyl ether compounds, dialdehyde compounds and the like are preferably used.

The basis weight of the fibers constituting the deodorant layer is preferably from 5 to 150 g / m ² from the viewpoint of temporarily holding the liquid and promptly transferring the liquid to the water-absorbing polymer. More preferably, it is 60 g / m ² . As the raw material fiber, for example, cellulosic fibers such as natural cellulose such as wood pulp and cotton and regenerated cellulose such as rayon and cupra can be used. In addition, filaments of thermoplastic fibers, staple fibers, and the like can also be used. From the viewpoint of cost, wood pulp is preferably used, and coniferous kraft pulp (NBKP) is particularly preferably used. In particular, it is preferable to use mainly bulky fibers, especially bulky cellulose fibers, since the passage and diffusion of the liquid can be enhanced. As used herein, the term “bulky fiber” refers to a fiber having a three-dimensional structure such as a twisted structure, a crimped structure, a bent and / or a branched structure, or an extremely thick fiber cross section (for example, having a fiber roughness of 0. 3 mg / m or more).

Preferred examples of the bulky fibers include fibers having a fiber roughness of 0.3 mg / m or more, particularly 0.3 to 2 m.
g / m of cellulose fibers. Cellulose fibers having a fiber roughness of 0.3 mg / m or more and a roundness of the fiber cross section of 0.5 to 1 are also preferable.
Further, as the bulky fiber, it is also preferable to use a crosslinked cellulose fiber obtained by crosslinking the inside and between the molecules of the cellulose fiber. Note that the fiber roughness is used as a scale indicating the fiber thickness in a fiber having a non-uniform fiber thickness, such as wood pulp. For example, a fiber roughness meter (FS-200, KAJANNI ELECTRONICS LTD.).

When cellulosic fibers are used, it is preferable to use heat-meltable adhesive fibers. By using such fibers, the wet strength of the fiber assembly can be increased. The hot-melt adhesive fiber is preferably used in an amount of 1 to 50% by weight, particularly 3 to 30% by weight based on the total weight of the raw material fibers.
As the heat-meltable adhesive fiber, a fiber that is melted by heating and adheres to each other can be used. Specifically, polyolefin-based fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyester-based fibers, and composites of polyethylene-polyester and the like can be used. Fibers and the like,
Particularly, polyvinyl alcohol, polyester and the like are preferably used. The above-mentioned hot-melt adhesive fiber generally has a fiber length of 2 to 60 mm and a fiber diameter of 0.5 to 3 denier.

In the present invention, deodorants dispersed in the deodorant layer include deodorants and deodorants that absorb malodors, deodorants that prevent the generation of malodors, and fragrances that mask malodors with other odors. It means a substance that suppresses odors in general.

For example, examples of the deodorant include chelating agents containing metal ions such as silver, zinc and copper, and substances carrying these metal ions (for example, zeolite impregnated with metal ions).

Examples of the deodorant and deodorant include (1) neutral activated carbon, fibrous carbon adsorbent, clay minerals such as zeolite, amorphous silica, bentonite and the like, and physically adsorbed deodorants such as activated alumina and acid clay. ) Acidic, alkaline,
Chemical deodorants such as oxidizing agents and reducing agents; (3) Physical or chemical deodorizing agents such as zeolite adsorbed with alkaline or acidic impregnated activated carbon and vegetable essential oil; and (4) Desulfurization of iron phthalocyanine derivatives, zinc oxide, etc. And a mixture of L-ascorbic acid and alum with an iron (II) compound.

As the fragrance, (1) alcohol-based fragrance,
(2) Glycerides such as monoglycerides, diglycerides and triglycerides of fragrances such as glycosides composed of monosaccharides, oligosaccharides and polysaccharides; 3) Amino acid derivatives or peptide derivatives of alcohol-based flavors, carboxylic acid-based flavors or amine-based flavors (such as indole and skatole).

The content of the deodorant in the deodorant layer is 5 to 8
0% by weight, especially 20 to 70% by weight, can exhibit effective deodorizing ability, and prevent the deodorant from falling off,
It is preferable because the strength of the deodorant layer can be sufficiently maintained.

The deodorant to be mixed with the fiber can be used without any particular limitation. However, when the deodorant layer is produced as a mixed sheet, it must be water-insoluble and must be easily mixed and dispersed with the fiber. And size. The form of the deodorant is preferably fibrous for easy mixing and dispersion with the fiber, or fine particles for facilitating incorporation into the fiber gap. As these preferred deodorants, it is possible to use fibrous deodorants such as activated carbon fibers and sepiolite, and various deodorants such as activated carbon powder. In particular, zeolite is used because it forms a uniform slurry with fiber and water and can form a sheet without unevenness and pores even when blended at a high ratio, and has a white particle and good appearance when blended. A powdery deodorant having high surface hydrophilicity such as powder, silica gel powder, activated alumina, and acid clay is preferred. Further, the size of the deodorant is preferably 200 μm or less in average particle size for fixing in the fiber gap, and 150 μm or less for obtaining uniform mixing.
It is preferable that the thickness be not more than μm. Among the deodorants, those having an average particle diameter of 10 to 150 μm are preferred in that the deodorant having a hydrophobic surface such as activated carbon powder prevents the powder from agglomerating due to hydrophobic interaction and becoming uneven. Preferably, 30-80μ
m are even more preferred. On the other hand, powdered deodorants with high surface hydrophilicity, such as zeolite powder, silica gel powder, activated alumina, and acid clay, have fine powders that are easier to suspend in water and have high deodorant performance (because of their large specific surface area). In terms of being obtained, those having an average particle size of 60 μm or less are preferable
Those having an average particle size of 30 μm or less are more preferred, and those having an average particle size of 10 μm or less are most preferred.

The amount of the deodorant is preferably as large as possible in order to enhance the deodorant function. However, as the amount is increased, the strength of the absorbent sheet is reduced, and the deodorant is liable to drop off from the deodorant layer. Further, depending on the deodorant, problems such as deterioration of the color tone of the absorbent sheet occur. Therefore, the blending amount of the deodorant suitably used from these viewpoints is preferably 5 to 30% in the activated carbon powder with respect to the weight of the entire absorbent sheet, and is preferably 1 to 30%.
0-20% is more preferred. Similarly, the compounding amount of the powdery deodorant having high surface hydrophilicity such as zeolite powder, silica gel powder, activated alumina, and acid clay is preferably 5 to 70% with respect to the weight of the entire absorbent sheet. ~ 60
% Is more preferred. In particular, the basis weight of the deodorant layer and the basis weight of the polymer necessary for enhancing the deodorizing ability and for expressing the absorption function are 15 to 100 g / m ² , preferably 20 to 50 g / m ^{2 for the} former.
^{2. The} latter is 5 to 100 g / m ² , preferably 10 to 50 g / m ² .
g / m ² .

In order to increase the strength of the deodorant layer or to enhance the fixability of the deodorant to the deodorant layer, a binder may be contained in the deodorant layer. As the binder, heat-fusible adhesive fibers such as synthetic fibers such as polyethylene, polypropylene and polyester, composite fibers of polyethylene and polypropylene, and composite fibers of polyethylene and polyester; adhesive properties such as polyvinyl alcohol fiber which dissolves in hot water fiber;
Papermaking aids such as carboxymethylcellulose, sponge and dialdehyde starch. The binder is preferably contained in the deodorant layer in an amount of 0.1 to 30% by weight, particularly 0.5 to 10% by weight.

The water-absorbing polymer layer 3 is a layer formed by dispersing a large number of particulate water-absorbing polymers 30. In the present embodiment, another deodorant 31 is further mixed. The water-absorbing polymer in the water-absorbing polymer layer preferably has an average particle size of 80 to 400 μm, more preferably 150 to 350 μm, from the viewpoint of the balance between the ease of spraying and the size that does not break through the support layer.

As the water-absorbing polymer, a polymer capable of absorbing and retaining a liquid 20 times or more its own weight and gelling is preferable. Specific examples thereof include polyacrylic acid and its salts, and polyacrylate graft polymers such as starch, cross-linked carboxymethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates, and the like.

The constituent material of the support layer is the same as that of the deodorant layer.
Preferably used for the fiber assembly which is a material
be able to. The basis weight of the support layer controls the water-absorbing polymer.
Is it a point of intervening between the odor layer and preventing stagnation of liquid?
Et al., 10 to 40 g / m^TwoPreferably, 15 to 3
0 g / m ^TwoIs more preferable.

Next, the absorbent sheet of the present invention will be described based on a method of manufacturing the absorbent sheet 1 of the first embodiment as a preferred embodiment.

<Method for producing deodorant layer> The method for producing the deodorant layer is preferably a method in which the deodorant is fluid-conveyed together with the fibers, mixed and formed into a sheet, and the deodorant is dispersed between the fibers. In particular, from the point that it can be uniformly dispersed without scattering to the surroundings,
It is preferable to produce a mixed slurry by mixing and dispersing the deodorant with various fibers in water to produce a mixed slurry, wet-forming the mixed slurry, and drying the mixed slurry to form a mixed sheet. In addition to the above methods, when melt-blowing a nonwoven fabric using a molten resin internally containing a hydrophilic agent, a production method of spraying an antiodorant in an air stream, using a molten resin internally containing a hydrophilic agent. It is also possible to use a method in which an antiodorant powder is dispersed and mixed in a melt-blown nonwoven fabric to produce the same. In addition, for example, the pulp may be uniformly mixed at the time of laying, and may be blended into the entire fiber aggregate. Further, fluff pulp containing no deodorant may be laminated. <Production method of support layer> The support layer is produced by wet-making the fibers constituting the support layer in a liquid such as water and drying. <Production method of water-absorbing polymer layer> The water-absorbing polymer layer is formed such that one surface of the deodorant layer or the support layer is in a wet state, and a water-absorbing polymer is sprayed on one surface of the wet state to make it wet. It is manufactured by adhering to the one surface with the adhesive force developed in a wet state. <Joint of deodorant layer and support layer> On the other hand, while producing the water-absorbent polymer layer, the support layer or the deodorant layer is attached to the deodorant layer or the support layer to which the water-absorbent polymer is adhered in a state where the water-absorbent polymer is swollen. Are brought into contact with each other and pressure-bonded, and they are joined to each other by an adhesive force developed in a wet state of the water-absorbing polymer. Then, after drying, the deodorant layer and the support layer are joined.

In order to bond the water-absorbing polymer to the deodorant layer, the water-absorbing polymer is sprayed on the wet deodorant layer, the anti-odor layer is superposed, and the water-absorbing polymer is adhered and integrated in the drying step. It is firmly fixed at the close position and is easy to transfer liquid, which is the most efficient. In particular, the simplest and most efficient absorbent sheet can be produced by producing a deodorant layer by the above wet papermaking, spraying a water-absorbing polymer in the wet state and immediately drying the absorbent sheet. After forming the water and adjusting the water content by dehydration as appropriate in a suction box or the like, immediately spray the water-absorbing polymer, and furthermore, the pre-wet paper-made deodorant layer so as to face the water-absorbing polymer sprayed on the support layer. The method of overlapping and drying and integrating is most preferable.

The absorbent sheet of the present embodiment has almost no falling off of the deodorant and the water-absorbing polymer, has a high deodorizing effect, and does not impair the absorption performance as in the prior art. In particular, by arranging and joining a water-absorbing polymer adjacent to the deodorant layer, which is a fiber sheet containing the deodorant, liquid staying in the deodorant layer is promptly transferred to the water-absorbent polymer, Since the liquid is withdrawn from the surroundings, the deodorant can easily exhibit its deodorant ability. In the present invention, the region where the water-absorbing polymer is concentrated and the region where the deodorant is concentrated are adjacent to each other,
The bonding structure is more effective because it creates a driving force to pull the liquid away from the deodorant. In addition, as a result of the liquid being quickly held by the water-absorbing polymer, decomposition of the liquid by bacteria is suppressed, and an increase in malodor is prevented. The water-absorbing polymer is
As it functions as a deodorant for a basic odor, its odor control ability can be enhanced. (As in this configuration, the layer containing the deodorant and the polymer are not completely separated from each other but are integrated adjacently. As a result, the water in the absorbed liquid is effectively extracted by the polymer and fixed.
It is possible to form an absorber in which the deodorant is hard to be in a wet state and the deodorant easily contacts the odor component. )
Further, the deodorant layer and the support layer with a water-absorbing polymer interposed therebetween,
In the case of bonding due to the adhesiveness due to swelling of the water-absorbing polymer, the water-absorbing polymer and the support layer can stably absorb and hold free liquid staying around the deodorant, and maintain a high deodorizing effect. . Further, according to the method for producing an absorbent sheet of the present embodiment, the absorbent sheet can be produced efficiently by using the adhesive force developed in a wet state of the water-absorbing polymer for bonding the deodorant layer and the support layer.

FIG. 2 schematically shows a second embodiment of the absorbent sheet of the present invention. In the figure,
Portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also, in FIG.
Although it is described that the water-absorbing polymer and the deodorant of different particle sizes are orderly dispersed, these dispersion arrangements are described only for convenience in explaining them, and these particle diameters and dispersion arrangements are described below. However, it is not limited to the one shown in FIG. As shown in the figure, the absorbent sheet according to the present embodiment includes a deodorant layer 2 in which an deodorant 20 is mixed with fibers 21, and a water-absorbent polymer in which a part of the water-absorbent polymer 30 is bonded to the deodorant layer 2. Layer 3,
It has a support layer 4 joined to the deodorant layer 2 by the adhesiveness developed in a swelling state of the water-absorbent polymer 30 in the water-absorbent polymer layer 3, and further includes the deodorant 31 in the water-absorbent polymer layer 3. This is an absorbent sheet having a bent structure.

In the present invention, a large amount of deodorant is blended in the sheet together with the deodorant of the deodorant layer in the absorbent polymer layer, and the water-absorbing polymers are gel-blocked by separating the deodorant particles from each other. It is preferable to mix a deodorant in the water-absorbing polymer layer in addition to the deodorant mixed with the fibers of the deodorant layer, from the viewpoint of effectively preventing odor and obtaining higher deodorant performance. In this case, the deodorant is preferably adhered and fixed to the deodorant layer via the water-absorbing polymer from the viewpoint of the deodorant performance of the deodorant and prevention of falling off. The deodorant to be mixed with the water-absorbing polymer layer has a medium particle size similar to that of the water-absorbing polymer, specifically, a particle size of 100 to 600 μm.
m is preferable, and a water-insoluble particle having a particle size of 200 to 400 μm is more preferable. The amount of the deodorant to be mixed with the water-absorbing polymer layer is preferably 5 or less, more preferably 2 or less in terms of the ratio (weight ratio) to the water-absorbing polymer 1 from the viewpoint of fixability to the water-absorbing polymer. . The deodorant mixed with the water-absorbing polymer layer may be the same or different from the deodorant mixed with the deodorant layer. However, from the viewpoint of enhancing the deodorant function and improving the color tone, etc. It is preferable that the odorant is different from the odorant. Preferred combinations are shown below from the viewpoint of enhancing the odor control function.
As the deodorant of the deodorant layer contained in the deodorant layer, relatively fine particles are desirable from the viewpoint of deodorant performance. <Exemplary 1> Fine powder having a large specific surface area is used for the deodorant of the deodorant layer.
By using medium-sized particles as the deodorant of the water-absorbing polymer layer, the odor is quickly absorbed by the fine powder, and the particles exhibit an effect until later, and maintain a high effect over a long period of time from the beginning. <Exemplary Example 2> By using zeolite powder or the like effective for acid / alkali odor as the deodorant of the deodorant layer, or granular activated carbon or the like effective for neutral odor as the deodorant of the water-absorbing polymer layer, all kinds of types can be obtained. An effective odor control sheet can be formed. Anti-odor layer (
Zeolite) has an acidic odor (lower fatty acids, etc.) and a basic odor (
Activated carbon is particularly effective for neutrality (ketones, mercaptans, alcohols, esters, etc.), and can cope with all kinds of high-concentration malodors excreted. <Exemplary 3> Antideodorant of silica, activated alumina, acid clay, zeolite, activated carbon and the like as deodorant of deodorant layer, and antibacterial property of silver, copper and zinc composite ceramics as deodorant of water absorbent polymer layer By arranging the deodorant particles, it is possible to form a deodorant sheet that quickly controls the odor contained in the excrement from the beginning and prevents the increase of the odor derived from microorganisms for a long time. <Exemplary Example 4> Placing deodorant powders such as silica, activated alumina, acid clay, zeolite, and activated carbon as deodorants in the deodorant layer, and fragrance-containing aromatic particles as deodorants in the water-absorbing polymer layer. Thereby, it is also possible to form a deodorant sheet which emits a pleasant scent while controlling a bad odor.

From the viewpoint of improving the color tone, the deodorant in the deodorant layer contained in the deodorant layer is preferably of a white type. The deodorant of the deodorant layer is white particles such as silica, activated alumina and acid clay, and the deodorant of the water-absorbing polymer layer is black or colored deodorant particles such as granular activated carbon. The latter color tone can be expressed with high deodorant ability while masking the white tone of the sheet containing the deodorant of the deodorant layer.

The deodorant in the water-absorbing polymer layer is preferably adhered and fixed to the deodorant layer via the water-absorbing polymer from the viewpoint of the deodorant performance of the deodorant and prevention of falling off.

Next, a method of manufacturing the absorbent sheet according to the second embodiment will be described. The deodorant layer and the support layer are manufactured in the same manner as in the method for manufacturing the absorbent sheet of the first embodiment. Then, taking advantage of the tackiness that the water-absorbing polymer expresses in the wet state, spraying the deodorant simultaneously with or before or after spraying the water-absorbing polymer on one side of the wet state of the deodorant layer or the support layer for spraying the water-absorbing polymer. And a water-absorbing polymer layer.

The deodorant to be dispersed and mixed in the water-absorbing polymer layer can be mixed with the water-absorbing polymer and sprayed at the same time, or can be easily mixed with the water-absorbing polymer by spraying before and after the water-absorbing polymer is sprayed. Further, the water absorbing polymer allows the deodorant to be efficiently fixed finally in the absorbent sheet. The bonding between the deodorant layer and the support layer is performed in the same manner as in the above embodiment.

The absorbent sheet of the present embodiment has a large amount of deodorant in addition to the effect of the absorbent sheet of the above-described first embodiment, and also includes a deodorant in the water-absorbing polymer layer together with the deodorant of the deodorant layer. By blending the odorant into the sheet and separating the water-absorbing polymer particles from each other, gel blocking can be effectively prevented and higher odor control performance can be obtained. Furthermore, by using different types of deodorants to be contained in the deodorant layer and the water-absorbing polymer layer,
Color tone can be easily improved.

The absorbent sheet of the present invention is particularly preferably used as an absorbent for absorbent articles such as sanitary napkins and disposable diapers, as well as underlay sheets for pet toilets and so-called foodstuffs used for storing / thawing frozen foods. It is also preferably used as a drip sheet, a deodorant toilet seat cover, a core material for deodorant sheets / futon covers, and a deodorant wallpaper.

The absorbent sheet of the present invention is not limited to the above embodiment, but can be variously modified without departing from the spirit of the present invention. For example, in order to enhance the deodorizing effect, a deodorant layer containing another deodorant may be further stacked on the deodorant layer. For example, by adding a zeolite-containing sheet to a deodorant layer using activated carbon as a deodorant, the appearance can be whitened and the deodorant effect can be enhanced. It is most effective that the water-absorbing polymer is directly sprayed on the deodorant layer and bonded integrally.However, for example, when the deodorant layer is reinforced and provided with a plurality of deodorant layers, a plurality of It may be composed of layers (having a laminated layer on the outside).

The absorbent sheet of the present invention further comprises a coating made of a nonwoven fabric or paper containing no deodorant on the deodorant layer from the viewpoint of preventing the deodorant from falling off and improving the color tone of the sheet. The layers can be stacked. The coating layer may be laminated only on the deodorant layer, or may be laminated on both the deodorant layer and the support layer. A method of laminating the coating layer, a method of laminating and drying and laminating papers made in advance in a wet process,
A method such as a simple lamination method can be used. More specifically, for example, a 100% pulp paper is combined with a deodorizing layer composed of a mixed sheet made of fibers and activated carbon by wet-type papermaking and dried integrally, and a coating layer in which the deodorizing layer is not visible on the surface. Can be formed. In particular, when the coating layer is interposed between the deodorant layer and the water-absorbing polymer layer, if the capillary force is higher than the capillary force of the deodorant layer due to high hydrophilicity or a narrow fiber interval, the coating layer stays in the deodorant layer. This is advantageous because it becomes a driving force for positively pulling the liquid to be absorbed into the water-absorbing polymer. The basis weight of the coating layer is preferably 30 g / m ² or less, particularly preferably 20 g / m ² or less, in order to sufficiently obtain the above effects.

Next, the absorbent article of the present invention will be described based on preferred embodiments with reference to the drawings. FIG.
Fig. 1 shows a widthwise cross section of a sanitary napkin as one embodiment of the absorbent article of the present invention.

As shown in the figure, this sanitary napkin 1
Reference numeral 00 denotes a substantially vertically elongated shape, a top sheet 200 as a liquid-permeable surface layer, a back sheet 300 as a liquid-impermeable leak-proof layer, and a liquid holding member interposed between the two sheets. The absorbent sheet 1 of the first embodiment is provided as an absorbent layer of the conductive layer. More specifically, the absorber 1 has a leak-proof sheet 6 such that the back surface thereof is in contact with the leak-proof sheet 600.
00. Absorbent sheet 1 and leakproof sheet 600
Is bonded and fixed by the hot melt adhesive 500. The leak-proof sheet 600 extending from both sides in the width direction of the absorbent sheet 1 is wound up on the upper surface side of the absorbent sheet 1 and covers both side parts in the width direction on the upper surface side of the absorbent sheet 1. Further, the top sheet 200 covers this.
The top sheet 200 extending from both sides in the width direction of the absorbent sheet 1 is folded into the back side of the absorbent sheet, and is joined and fixed by the hot-melt adhesive 500 to the leak-proof sheet 600 covering the back side of the absorbent sheet 1. I have. A hot-melt adhesive 500 is spirally applied to the outer surface of the leak-proof sheet 600 covering the back side of the absorbent sheet 1. The hot melt adhesive 500 is also applied to the outer surface of the top sheet 200 folded on the back side of the absorbent sheet 1. The back sheet 300 is adhesively fixed on these hot melt pressure-sensitive adhesive coated surfaces. An adhesive 700 for fixing the napkin 100 to the wearer's clothes is applied to the outer surface of the back sheet 300 in two places in a belt shape. The adhesive 700 is protected by a release paper 800. Further, the top sheet 200, the back sheet 300, and the leak-proof sheet 60 extending from the front and rear ends of the absorbent sheet 1 are provided.
0 are bonded and fixed to each other by heat sealing (not shown).

The top sheet as the surface layer and the back sheet, the leak-proof sheet, the adhesive, the release paper and the like as the above-mentioned leak-proof layer constituting the absorbent article of the present invention are those commonly used in absorbent articles. Can be used without restriction.

The absorbent article of the present invention preferably has the following deodorizing properties in a wet state after absorbing liquid (hereinafter referred to as wet deodorizing ability). Immediately after a solution having a predetermined concentration is previously absorbed in the same part of the absorbent article in a predetermined order, the solution is put in a 900 mL glass container, and the glass container is immediately sealed and stored at 25 ° C. for a predetermined time, and then has the following gas concentration. When 60 μL of a 29 wt% ammonia aqueous solution and 5 mL of a saline solution were absorbed in this order into the same part of the absorbent article, the concentration of the ammonia gas became 2 after 30 minutes.
0 ppm or less. 10 ppm or less after 3 hours. After 100 μL of methyl mercaptan (1 μg / μL benzene solution) and 5 mL of physiological saline were absorbed in this order into the same portion of the absorbent article, and stored for 30 minutes and 3 hours in the same manner as above, the concentration of methyl mercaptan gas was as follows: It is on the street. 10 ppm or less after 30 minutes. 3 ppm or less after 3 hours.

The wet-type deodorant ability means the ability of the absorbent article of the present invention to control odor even when the absorbent article absorbs and wets, and more specifically, the odor generated from the liquid absorbed by the absorbent article, It is the ability to keep it closed without leaking outside. That is, the odor component is overwhelmingly dissolved in a body fluid such as menstrual blood and excreted as a liquid outside the body. Therefore, once the body fluid is absorbed by the absorbent article, the odor can be reliably trapped so that the odor is not separated from the absorbent article as a gas and comes out of the absorbent article. It can be said that the effect is extremely high. This is the wet deodorizing ability. The wet odor control ability
At least the short-term (after 30 minutes) odor concentration is important. In other words, in the wet deodorizing ability, the odor emanates outside the absorbent article for a while immediately after the liquid is injected and sealed,
Once the odor concentration increases rapidly, it takes a complicated process of decreasing after having reached the peak value of the concentration, and after 30 minutes, it has shifted to a monotonous decrease. Therefore, there is a peak of the concentration of the odor between 0 and 30 minutes, and unless the peak concentration is sufficiently reduced, the odor is perceived by surrounding people.

The peak concentration greatly fluctuates depending on the properties and distribution of the liquid, and it is difficult to define the wet odor control ability based on the peak concentration. On the other hand, if the absorbent article is capable of sufficiently lowering the odor concentration 30 minutes after the concentration is stabilized, the peak concentration is not significantly increased, so that effective deodorizing performance is exhibited. Therefore, the odor concentration after 30 minutes is used as a measure of the wet odor control ability. With respect to the wet deodorizing ability, the concentration of the ammonia gas and the mercaptan gas after 30 minutes is as described above, whereby the rapid increase in the concentration of the odor due to the emission of the odor from the liquid is suppressed, and the odor concentration is at least recognized. It is possible to keep it at a difficult level. Further, since the concentrations of the ammonia gas and the methyl mercaptan gas after 3 hours are as described above, the odor is almost completely controlled during the average wearing time (2 to 3 hours) of the sanitary product.

[Odor Control Performance (Absorptive Article)] The wet deodorant performance is measured by the following method in an environment of 25 ° C. and 50 to 60% RH. The liquid is injected into a substantially central portion of the absorbent article. The absorbent article is then immediately sealed in a sealable 900 mL glass container. The aqueous ammonia solution is a 29% by weight aqueous solution [manufactured by Kanto Chemical Co., Ltd.]
Inject 60 μL with a microsyringe. 5 mL of physiological saline is injected with a female pipette or a whole pipette. As for methyl mercaptan, 100 μL of a 1 μg / μL benzene solution (manufactured by Wako Pure Chemical Industries, Ltd.) is injected with a microsyringe.

The measurement of each gas concentration is specifically performed as follows. (1) Both gas suction devices are common, and Gastec GV-10
Using 0S, gas suction of 100 mL is performed by one suction. The suction holding time was 1 minute according to the usage. (2) If the ammonia concentration is high (30 ppm or more), use Gastec No. 3La for the detector tube, and if the concentration is low (less than 30 ppm), use Gastec No. 3L for the detector tube. The ammonia concentration is determined from the range in which has changed color. (3) If the concentration of methyl mercaptan is high (more than 5 ppm), add gastech No. 70 to the detector tube and use low concentration (4 ppm).
In the following cases, use Gastec No. 70L for the detector tube, and determine the methyl mercaptan concentration from the range in which the detector tube has changed color. When the discoloration stops in the middle of the scale of the detector tube, the density is obtained by proportional calculation using the values of the upper and lower scales. Each measurement is performed three times, and the average value is calculated. In each measurement, 100 mL of the gas in the container is sucked and consumed by one measurement, so that repeated measurement which causes an error is not performed. Therefore, for the same gas concentration measurement, the measurement after 30 minutes and the measurement after 3 hours are separately performed by preparing separate samples.

In the conventional absorbent articles, with respect to the wet-type deodorizing ability, the bad odor generated from the liquid absorbed in the absorbent articles could not be sufficiently confined, and a sufficient deodorizing effect did not occur. On the other hand, since the absorbent article of the present invention has the above-described configuration, it has an excellent effect of trapping odors generated from the liquid absorbed by the absorbent article.

[0051]

<Example 1> (Production of absorbent sheet A) 70 parts of a crosslinked pulp (HBA, trade name of Weerhauser, trade name: HBA) having a centrifugal retention of 0.3 g / g, powdered activated carbon 21 having an average particle size of 10 µm (Nimura Chemical, SA-1000)
27 parts, 1 denier thick, 3 mm long as binder
Was mixed and dispersed in water to obtain a papermaking raw material of a predetermined concentration. This papermaking raw material was supplied to a papermaking section of a wet papermaking machine, and papermaking was performed so that the dry basis weight was 30 g / m ² to form an anti-odor layer. Next, the deodorant layer was dehydrated with a suction box to a moisture content of 60%, and a sheet having a basis weight of 20 g / m ² (the above-mentioned crosslinked pulp 9) was made in advance.
7 parts, formed from 3 parts of the polyvinyl alcohol fiber), and dried and integrated at 130 ° C. with a Yankee dryer to obtain a layer including an antiodor layer. Similarly, 97 parts of the crosslinked pulp and 3 parts of the polyvinyl alcohol fiber were dispersed and mixed in water to obtain a papermaking raw material having a predetermined concentration. This papermaking raw material is supplied to the papermaking section of a wet paper machine, and the dry basis weight is 30.
g / m ² to form a support layer 3. Then, the support layer 3 is dehydrated by a suction box to adjust its moisture content to 60%, and a water-absorbing polymer 4 (Nippon Shokubai Co., Ltd., trade name Aquaric) is placed on the support layer 3.
Was sprayed almost uniformly at a spray basis weight of 30 g / m ² . The layer 2 is superposed on the water-absorbing polymer 4 such that the deodorant layer faces the water-absorbing polymer, and the superimposed body is dried and integrated at 130 ° C. with a Yankee dryer to form paper. An anti-odor absorbing sheet in which the polymer and the activated carbon were mixed and buried was obtained. The basis weight of this sheet is 110 g / m ² .

<Example 2> (Production of Absorbent Sheet B) 47 parts of softwood chemical pulp (trade name: Skeena Prime, manufactured by Skeena Cellulose) having a centrifugal retention of 1.3 g / g, zeolite powder having an average particle size of 2 μm ( 50 parts of Tosoh Corp. (trade name: Zeolum) and 3 parts of the polyvinyl alcohol fiber as a binder were dispersed and mixed in water to obtain a papermaking raw material having a predetermined concentration. This papermaking raw material is supplied to a papermaking section of a wet papermaking machine, papermaking is performed so that the dry basis weight becomes 35 g / m ² , an odor control layer is formed, and the resultant is dried and integrated at 130 ° C. with a Yankee dryer to obtain an upper layer. Was. Similarly, said softwood chemical pulp 9
7 parts and 3 parts of the polyvinyl alcohol fiber are dispersed and mixed in water and supplied to a paper making section of a wet paper machine, and the dry basis weight is 30 g.
/ M ² , the support layer was formed. Next, the support layer was dehydrated with a suction box, the moisture content was adjusted to 60%, and the same superabsorbent polymer as in Example 1 was sprayed on the support layer at a uniform basis weight of 30 g / m ^2. At the same time, granular activated carbon 42 (CW480B, manufactured by Nimura Chemical Co., Ltd.) was sprayed with another sprayer at a spray basis weight of 30 g / m ² . These particles were set to be substantially uniformly mixed by setting the nozzle of the sprayer at substantially the same position. The above-mentioned coating layer is laminated on the mixed layer of the water-absorbing polymer and the deodorant, and the laminate is introduced into a Yankee dryer and dried and integrated at 130 ° C., so that the water-absorbing polymer is contained in the fiber assembly. And an absorbent sheet having mixed and buried activated carbon was obtained. The basis weight of this sheet is 125 g / m ² .

<Comparative Example 1> (Production of Absorbent Sheet C) 90 parts of the softwood chemical pulp of Example 2 and 10 parts of fibrous activated carbon (Fingard B, manufactured by Toho Bethlon) were dispersed in water, and the basis weight was 40 g / m2. No. ² absorbent sheet was obtained, and this was designated as absorbent sheet C.

<Comparative Example 2> (Production of Absorbent Sheet D) A chemical pulp having a centrifugal retention of 1.2 g / g (trade name: NB420, manufactured by Wehrhauser Co., Ltd.) was weighed in the air at a basis weight of 50 g / g.
and fiber stacking in m ^2, the spread over the pulp the same superabsorbent polymer of Example 1 having a basis weight 10 g / m ^2, implemented as a deodorant agent Example 2
Of granular activated carbon having a basis weight of 10 g / m ² was sprayed substantially uniformly.
Further, the above-mentioned chemical pulp was piled up at a basis weight of 50 g / m ² , laminated, and then compressed to obtain an absorbent sheet D. The basis weight of this sheet is 120 g / m ² .

The absorbent sheets A to D obtained as described above were subjected to the following odor control performance, absorption performance and drop-out test. Each measurement environment is 25 ° C. and 50 to 60% RH. Table 1 shows the results.

[Odor control performance evaluation (absorption sheet)] Absorption sheets A to D were cut to 170 mm in length and 70 mm in width, respectively, except that the amount of physiological saline injected simultaneously was 3 mL. The evaluation was performed in the same manner as described above.

[Evaluation of Absorbing Performance] Absorbing sheets A to D were cut into the same shapes as in the evaluation of the deodorizing performance to obtain samples.
Length 130 made of 250 mesh nylon net
Each absorbent sheet is folded in two in a bag having a width of 100 mm and a width of 100 mm, and the bag is put into a pad filled with physiological saline and left for 10 minutes. Immediately afterwards in a centrifuge 200
The weight is measured after centrifugation at 0 rpm. And
The sample weight after absorption was calculated by subtracting the weight of the bag from the initial sample weight measured in advance, and the value obtained by dividing the sample weight after water absorption by the initial sample weight was defined as the saturated water absorption. Then, the water absorption performance of the absorbent sheet was evaluated from the saturated water absorption.

[Dropping test] <Dropping rate of deodorant and polymer> Absorbing sheets A to D were cut into 170 mm in length and 70 mm in width to obtain samples, and the weight of each sample was measured.
It was placed in a plastic bag with a mechanical fastener having a width of 200 mm and a width of 200 mm. After the test was completed, the weight of each sample was measured, and the value of (weight before test-weight after test) was defined as the amount of the deodorant and the water-absorbing polymer dropped off. At this time, visual evaluation was performed simultaneously and evaluated as follows. ；: Deodorant / water-absorbing polymer was hardly dropped off (50 mg or less). Δ: Some of the deodorant / water-absorbing polymer dropped off (5)
0 mg to less than 150 mg). X: The deodorant / water-absorbing polymer was considerably removed (150 mg or more).

[0059]

[Table 1]

As shown in Table 1, in Examples 1 and 2,
Due to the structure of the sheet as described above, it exhibits excellent wet deodorizing ability and is less likely to fall off. Comparative Example 1 is a simple mixed paper, and thus has a small amount of falling off, but does not have a sufficient deodorizing ability. In Comparative Example 2, since the deodorant did not function effectively, the deodorant ability was low, and the fixation of the deodorant and the polymer was weak, so that the deodorant increased.

Example 3 Production of Sanitary Napkin 100 A sanitary napkin 100 as an absorbent article shown in FIG. 3 was produced. Absorbing sheet A having a width of 150 mm and a length of 175 mm was C-held to form absorbing layer 1. The absorption layer 1
Wrapped in a leak-proof layer 300 made of polyethylene film having a width of 100 mm and a length of 205 mm, and a width of 120 mm and a length of 20
The sheet was further wrapped with a liquid-permeable surface layer 200 made of a 5 mm polyethylene apertured film, and a leak-proof sheet 600 made of a polyethylene film was further overlapped, and the front and back were bonded by heat sealing. Further, a hot melt adhesive 700 for preventing displacement and a release paper 800 were provided on the non-skin contact surface side of the sanitary napkin. Thus, a sanitary napkin 100 having a length of 205 mm and a width of 75 mm was obtained. Incidentally, reference numeral 500 in FIG. 3 denotes an adhesive (hot melt adhesive).

Example 4 Manufacture of Sanitary Napkin 110 A sanitary napkin was obtained in the same manner as in Example 3, except that the absorbent sheet B was used instead of the absorbent sheet A of Example 3.

Comparative Example 3 As shown in FIG. 4, a chemical pulp (trade name: NB420, manufactured by Wehrhauser) was used.
In air, a width of 70 mm and a length of 175 with a basis weight of 300 g / m ²
The laminated body 900 was formed. 30 g / m ² of water-absorbing polymer 14 (Nippon Shokubai Co., Ltd., trade name: Aquaric) was sprayed on the lower layer, and the width was 70 mm and the length was 17 mm.
5 mm of the absorbent sheet C (12 in the figure) is overlaid,
Further, the whole was wrapped with absorbent paper 13 made of 100% of chemical pulp (trade name: NB420, manufactured by Wehrhauser, trade name: NB420) having a centrifugal retention of 1.2 g / g and an absorbent paper 13 having a width of 160 mm, a length of 175 mm, and a basis weight of 18 g / m ^2. 400. Then, the absorption layer 400 is wrapped with a leak-proof layer 300 made of a polyethylene film having a width of 100 mm and a length of 205 mm.
It was further wrapped with a liquid-permeable surface layer 200 made of a polyethylene apertured film having a length of 0 mm and a length of 205 mm, further superposed with a leak-proof sheet 600 made of a polyethylene film, and adhered by heat sealing before and after. Further, a hot melt adhesive 700 for preventing displacement and a release paper 800 were provided on the non-skin contact surface side of the sanitary napkin. In this way,
A sanitary napkin 110 having a length of 205 mm and a width of 75 mm was obtained. Incidentally, reference numeral 500 in FIG. 4 denotes an adhesive (hot melt adhesive).

Comparative Example 4 A sanitary napkin was obtained in the same manner as in Example 5, except that the absorbent sheet A was replaced with the absorbent sheet D.

Comparative Example 5 A commercially available sanitary napkin (manufactured by Kao, trade name: Laurier Soft Mesh Regular) was used.
Comparative Example 5 was set.

[Evaluation of Odor Control Performance of Absorbent Article]
4 and the sanitary napkins as the absorbent articles obtained in Comparative Examples 3 to 5 were evaluated by the following odor control performance evaluation, sensory evaluation, and use test. The evaluation environment for the sensory evaluation and the use test was about 25 ° C. and 50 to 60% RH. The results are shown in Table 2.

[Evaluation of Odor Control Performance] The evaluation of the odor control performance was based on the evaluation of the odor control performance of the absorbent article.

[Evaluation of Sensory Performance] The sanitary napkins of Examples 1 to 4 and Comparative Examples 1 to 5 were attached to a movable human body model using sanitary shorts. Next, the movable human body model was walked at a walking speed of 100 steps / min (50 m / min). Then, while walking, a solution containing 100 μL of diethylamine in 5 mL of physiological saline was placed in a napkin for 5 m.
L was injected and allowed to walk at the same speed for 30 minutes. Thereafter, the napkin was taken out and used as a test sample. Then, the nose was approached at a distance of about 10 cm from the surface side of the test sample to a monitor of 25 randomly selected persons, and the odor was smelled. The results were represented by an average score of a total of 25 persons. As for the score, the smaller the value is, the more the odor is absorbed and the higher the odor control effect is.

Evaluation criteria 1 point: No smell. 2 points: Smell slightly, but not bothersome. 3 points: Slightly unpleasant odor. 4 points: smells unpleasant.

[Usage test] 25 women sensitive to odor at the time of menstruation selected in advance by an awareness survey were used as monitors.
When the sanitary napkins of Examples 3 and 4 and Comparative Examples 3 to 5 were passed to each monitor, and each napkin was worn for 2 hours or more per four napkins, the following odors were investigated. 1. Odor during use after a certain period of time (after 1 hour) 2. Odor when removed The results were expressed as the average score of 25 people in total. The smaller the score, the more the odor is absorbed and the higher the odor control effect. ● Evaluation index No smell …… 1 point Smell slightly but not bothersome …… 2 points Slightly unpleasant odor …… 3 points Unpleasant odor …… 4 points

[0071]

[Table 2]

As shown in Table 2, the product of the present invention (Example 3,
In 4), it was confirmed that all of Comparative Examples 3 to 5 had a high odor control effect and could control odor to a level at which no odor was caused or no odor was noticed.

[0073]

According to the present invention, the following effects can be obtained. The absorbent sheet of the present invention has a high deodorizing effect, has little deodorant and water-absorbing polymer, and does not impair the absorption performance as in the conventional case. In particular, by arranging and joining a water-absorbing polymer adjacent to the deodorant layer, which is a fiber sheet containing the deodorant, liquid staying in the deodorant layer is promptly transferred to the water-absorbent polymer, Since the liquid is withdrawn from the surroundings, the deodorant can easily exhibit its deodorant ability. In the present invention, the structure in which the region where the water-absorbing polymer is concentrated and the region where the deodorant is concentrated is adjacent is more effective because it generates a driving force for separating the liquid from the deodorant. In addition, as a result of the liquid being quickly held by the water-absorbing polymer, decomposition of the liquid by bacteria is suppressed, and there is almost no risk of causing an increase in odor. The water-absorbing polymer itself functions as a deodorant for a basic odor, and thus can enhance the deodorant ability. Further, when the deodorant layer and the support layer with the water-absorbing polymer interposed therebetween are bonded by the adhesiveness due to the swelling of the water-absorbent polymer, the free liquid staying around the deodorant is stabilized by the water-absorbent polymer and the support layer. To maintain high odor control effect. In addition, by including a deodorant in the water-absorbing polymer layer together with the deodorant in the deodorant layer, a large amount of deodorant is blended into the sheet, and the particles of the deodorant separate the water-absorbing polymers from each other. Thereby, gel blocking can be effectively prevented, and higher anti-odor performance can be obtained. Furthermore, the odor control function can be enhanced and the color tone can be easily improved. ADVANTAGE OF THE INVENTION According to the manufacturing method of the absorbent sheet of this invention, the adhesive sheet which expresses in the wet state of a water absorbing polymer is used for joining a deodorant layer and a support layer, and the absorbent sheet which exhibits the said effect can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is a side sectional view schematically showing an absorbent sheet according to a first embodiment of the present invention.

FIG. 2 is a side sectional view schematically showing an absorbent sheet according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing an absorbent article using the absorbent sheet of the present invention.

FIG. 4 is a sectional view showing an absorbent article of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorbent sheet 2 Deodorant layer 20 Deodorant 21 Fiber 3 Water-absorbing polymer layer 30 Water-absorbing polymer 31 Deodorant 4 Support layer 100 Absorbent article

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinsuke Nagahara 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Pref. (72) Inventor Minoru Minato 2606 Akabane-Akabane, Kaiga-cho, Haga-gun, Tochigi F Terms (reference) 3B029 BA04 BA17 BD22 BF03 4C003 AA07 AA14 HA01

Claims (7)

[Claims] 1. An absorbent sheet containing at least an deodorant and a water-absorbing polymer, wherein the water-absorbing layer comprises a mixture of the deodorant and fiber, and a part of the water-absorbing polymer is bonded to the deodorant layer. An absorbent sheet having a polymer layer. 2. The absorbent sheet has a support layer made of a fiber aggregate, and the support layer is bonded to the deodorant layer by the adhesiveness developed in a swelling state of the water-absorbing polymer in the water-absorbing polymer layer. 2. The method according to claim 1, wherein
Absorbent sheet as described. 3. The absorbent sheet according to claim 1, wherein the water-absorbing polymer layer further contains an anti-odorant. 4. The absorbent sheet according to claim 3, wherein the deodorant in the water absorbing polymer layer is bonded and fixed to the deodorizing layer via the water absorbing polymer. 5. The absorbent sheet according to claim 3, wherein the deodorant in the water absorbing polymer layer is different from the deodorant in the deodorant layer. 6. The method for producing an absorbent sheet according to claim 2, wherein the mixed slurry obtained by dispersing and mixing the deodorant and the fiber in a liquid is wet-processed to obtain the deodorant layer. Papermaking to obtain the support layer, wetting the deodorant layer or the support layer, spraying a water-absorbing polymer on one surface thereof to swell, and forming the support layer on the one surface in a state where the water-absorbing polymer is swollen. Alternatively, a method for producing an absorbent sheet, comprising a bonding step of bringing the anti-odor layer into contact with the anti-odor layer, drying the anti-odor layer and bonding the lower layer. 7. A liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retentive absorbing layer interposed between both layers, wherein the absorbing layer has the absorbent sheet according to claim 1. Absorbent products.