JP6575419B2 - Carbon dioxide generation sheet - Google Patents

Description

  The present invention relates to a carbon dioxide generating sheet, and more particularly to a carbon dioxide generating sheet suitable for use on a skin or for wiping when cleaning. The carbon dioxide generating sheet of the present invention can be used in the fields of cosmetics, pharmaceutical parts, pharmaceuticals, cleaning supplies, miscellaneous goods, and the like.

  It is known that skin blood circulation is promoted when carbon dioxide gas acts on the skin. Therefore, a material that generates carbon dioxide is used as an external preparation for skin that is applied to the face, scalp, and skin of other parts such as hands, neck, and feet. Carbon dioxide gas is known to be effective in removing dirt such as protein and scale due to the physical force of bubbles and weak acidity.

  As a material for generating carbon dioxide, a carbon dioxide generator containing a carbonate and an acid is conventionally known (see, for example, Patent Documents 1 and 2). When water such as skin lotion is supplied to the carbon dioxide generating agent, the carbonate and acid react with water to generate carbon dioxide.

  Patent Document 3 employs sodium hydrogen carbonate and citric acid or sodium dihydrogen citrate as a carbon dioxide gas generating agent, water-permeable breathable nonwoven fabric, sodium hydrogen carbonate, coarse nonwoven fabric, citric acid or A sheet-shaped pack material having a five-layer structure obtained by sequentially laminating sodium dihydrogen citrate and a water-permeable breathable nonwoven fabric is disclosed.

  In the configuration of Patent Document 3, when a user impregnates a sheet-like pack material with water such as lotion, the water is supplied to sodium bicarbonate and citric acid or sodium dihydrogen citrate through a water-permeable breathable nonwoven fabric. . Both sodium bicarbonate and citric acid or sodium dihydrogen citrate are soluble in water. Then, the dissolved solution comes into contact through the coarse nonwoven fabric and starts the reaction to generate carbon dioxide gas.

  Further, in the sheet-shaped pack material of Patent Document 3, for the purpose of extending the generation time of carbon dioxide gas, water-soluble carboxymethyl cellulose is added to either sodium hydrogen carbonate and citric acid or sodium dihydrogen citrate. (CMC) is mixed.

JP 2004-83498 A Japanese Patent No. 5531177 JP 2014-65707 A

  Patent Document 3 discloses that an intermediate layer has a water flow for an outer layer so that sodium hydrogen carbonate dissolved in water and citric acid or sodium dihydrogen citrate are in contact with each other through a gap between constituent fibers and easily react. It is disclosed to use a coarse nonwoven fabric different from a breathable nonwoven fabric. In other words, in the sheet-shaped pack material of Patent Document 3, a coarse nonwoven fabric that can facilitate the reaction cannot be used for the outer layer for some reason such as causing powder falling. Moreover, when the water-permeable breathable nonwoven fabric for outer layers is used for an intermediate | middle layer, reactivity will be inferior. Therefore, in patent document 3, there exists a disadvantage that a nonwoven fabric of the same material cannot be used for an outer layer and an intermediate | middle layer, and an outer layer cannot be provided.

  Moreover, although patent document 3 has shown extending generation | occurrence | production time of a carbon dioxide gas by using CMC together with a carbon dioxide generator, there exists a request | requirement to maintain the production | generation of a carbon dioxide gas by another structure. is there.

  One object of the present invention is to provide a carbon dioxide gas generating sheet that is different from the structure of Patent Document 3 and is less likely to fall off and has good reactivity.

  Another object of the present invention is to provide a carbon dioxide generating sheet excellent in the sustaining effect of carbon dioxide generation.

The present invention for solving the above-described problems has the following aspects.
1. A laminate comprising a carbonate layer and an acid layer, comprising a water-permeable or water-absorbent sheet between the carbonate layer and the acid layer, wherein the carbonate layer and the acid layer comprise the water-permeable or water-absorbent sheet. Carbon dioxide gas obtained by disposing a mixture of carbonate particles or acid particles and a heat-fusible resin on the surface of the adhesive sheet and melting the heat-fusible resin with heat Occurrence sheet.
2. The heat-fusible resin includes a resin selected from the group consisting of a particulate heat-fusible resin, a fibrous heat-fusible resin, and a mixture thereof. The carbon dioxide generating sheet described in 1.
3. At least one of the carbonate layer and the acid layer contains a water-absorbing material. Or 2. The carbon dioxide generating sheet described in 1.

  The carbon dioxide generating sheet according to an aspect of the present invention is a laminate including a carbonate layer and an acid layer, and the carbonate layer and the acid layer have a water-permeable or water-absorbent sheet therebetween.

  The carbon dioxide generating sheet according to an aspect of the present invention is such that the carbonate particles contained in the carbonate layer and the acid particles contained in the acid layer are water-permeable or absorbent on the surface of the water-absorbent sheet and / or the carbonate layer. And fixed in the acid layer. Therefore, it is difficult for the phenomenon of powder falling that the carbonate particles and the acid particles are peeled off from the sheet.

  Another aspect of the carbon dioxide gas generating sheet according to another aspect of the present invention includes a water absorbing material in at least one of the carbonate layer and the acid layer. In this embodiment, the carbonate or acid can be dispersed in the thickness direction of the carbonate layer or acid layer due to the presence of the water-absorbing material. Further, the water-absorbing material can gradually permeate moisture. Therefore, when using the carbon dioxide gas generating sheet, the time for starting the reaction between the carbonate and the acid can be widened. As a result, the carbon dioxide gas generating sheet as a whole has a long duration. can do.

  In the layer containing the water-absorbing material, especially when the water-absorbing material is fibrous, the carbonate or acid is easily maintained in the layer due to the presence of the water-absorbing material. Further, the shape of the carbon dioxide generating sheet is easily maintained when the carbonate layer and / or the acid layer contains a water-absorbing material. Therefore, it is possible to improve the yield of carbonate and / or acid during the production, storage and use of the carbon dioxide generating sheet, and prevent powder falling even when subjected to deformation such as folding. be able to. Therefore, loss of the carbon dioxide gas generating agent is prevented, leading to cost reduction. Further, the cost can be reduced by selecting the water-absorbing material itself.

It is a figure which shows the structural example of the carbon dioxide generation sheet | seat of this invention. It is a schematic diagram which shows the web formation apparatus which can be used in the manufacturing method of the carbon dioxide generation sheet | seat of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

<Carbon dioxide generation sheet>
The carbon dioxide generating sheet of the present invention is a laminate including a carbonate layer and an acid layer, and includes a water-permeable or water-absorbent sheet between the carbonate layer and the acid layer, and the carbonate layer and the acid layer. Is obtained by disposing a mixture of carbonate particles or acid particles and a heat-fusible resin on the surface of the water-permeable or water-absorbent sheet, and melting the heat-fusible resin with heat. It is characterized by that. In the carbonate layer, the carbonate particles are fixed in a state where a part thereof is covered with the heat-fusible resin. Similarly, in the acid layer, the acid particles are fixed in a state where a part thereof is covered with the heat-fusible resin. The carbon dioxide generating sheet of the present invention is manufactured by a dry method in order to prevent a reaction between a carbonate and an acid during the manufacturing process.

(Layer structure and effects)
FIG. 1 is a diagram showing the structure of the carbon dioxide generating sheet of the present invention for the purpose of illustration and not for the purpose of limitation. In the drawings, the same reference numerals indicate the same components. For the same component, a duplicate description may be omitted.

  The carbon dioxide generating sheet shown in FIG. 1A includes a water permeable or water absorbent sheet 300, a carbonate layer 130, a water permeable or water absorbent sheet 300, an acid layer 230, a water permeable or water absorbent sheet 300, , In order. The carbonate layer 130 was formed through a process of passing a mixture of the carbonate particles 13 and the heat-fusible resin 16 on the surface of the water-soluble or water-absorbent sheet 300 and thermally melting the heat-fusible resin 16. Is a layer. Further, the acid layer 230 is formed through a step of passing a mixture of the carbonate particles 23 and the heat-fusible resin 16 on the surface of the water-soluble or water-absorbent sheet 300 and thermally melting the heat-fusible resin 16. Layer.

  In the configuration of FIG. 1A, in the carbonate layer 130, the carbonate particles 13 are fixed in a state where a part thereof is covered with a heat-fusible resin. Therefore, the carbonate particles 13 are unlikely to fall off from the carbon dioxide generating sheet, and moisture can come into contact with the carbonate when the carbon dioxide generating sheet is used. Since the heat-fusible resin and the carbonate particles are uniformly dispersed, the carbonate particles can be arranged uniformly in the plane.

  Similarly, in the acid layer 230, the acid particles 23 are fixed in a state where a part thereof is covered with the heat-fusible resin. Therefore, the acid particles 23 are unlikely to fall off from the carbon dioxide generating sheet, and moisture can come into contact with the acid when the carbon dioxide generating sheet is used. Since the heat-fusible resin and the acid particles are uniformly dispersed, the acid particles can be uniformly arranged in the plane.

  Further, since the water-permeable or water-absorbent sheet 300 is provided so as to cover the upper surfaces of the carbonate layer 130 and the acid layer 230, the possibility of carbonate or acid powder falling from the carbon dioxide generating sheet is further reduced. Can be made. The water-permeable or water-absorbent sheet 300 corresponding to the outer layer of the carbon dioxide generating sheet is not an essential element in the present invention.

  The carbon dioxide generating sheet shown in FIG. 1B is a water-permeable or water-absorbing sheet 300 provided so as to cover the upper surfaces of the carbonate layer 130 and the acid layer 230 in the configuration shown in FIG. A configuration in which one side is replaced with a film 400 having relatively low air permeability is shown. In the configuration having the low-breathable film 400 on one side, in addition to the same effects as the configuration shown in FIG. 1A, the carbon dioxide gas generated during use is prevented or suppressed from being released from the surface on the film arrangement side. The effect that can be produced. Therefore, by applying the surface opposite to the surface on the film placement side to the skin, it becomes possible to apply the carbon dioxide gas to the skin in a concentrated manner and / or for a long time.

  Further, for example, one or both of the carbonate layer 130 and the acid layer 230 may further include a water absorbing material.

  The carbon dioxide generating sheet shown in FIG. 1C includes a water-permeable or water-absorbing sheet 300, a carbonate layer 100 containing a water-absorbing material, a water-permeable or water-absorbing sheet 300, an acid layer 230, It has the structure which laminated | stacked the water absorbing sheet 300 in order. The carbonate layer 100 containing the water-absorbing material is formed by arranging the absorbent material on the surface of the water-absorbing or water-absorbing sheet 300 in addition to the mixture of the carbonate particles 13 and the heat-fusible resin 16. 16 is a layer formed through a process of thermally melting 16. In the carbonate layer 100 containing a water-absorbing material, the carbonate particles 13 and the absorbent material are fixed in a state of being partially covered by the heat-fusible resin 16.

  The carbon dioxide generating sheet shown in FIG. 1D includes a water-permeable or water-absorbing sheet 300, an acid layer 200 containing a water-absorbing material, a water-permeable or water-absorbing sheet 300, a carbonate layer 130, It has a configuration in which a film 400 having relatively low air permeability as compared with the water absorbent sheet 300 is laminated in order. In addition to the mixture of the acid particles 23 and the heat-fusible resin 16, the acid layer 200 including the water-absorbing material is disposed on the surface of the water-absorbing or water-absorbing sheet 300 in addition to the mixture of the acid particles 23 and the heat-fusible resin 16. It is a layer formed through a heat melting step. In the acid layer 200 including the water-absorbing material, the acid particles 23 and the absorbent material are fixed in a state where they are partially covered with the heat-fusible resin 16.

  In FIG. 1C and FIG. 1D, the absorbent material is blended only in one of the carbonate layer and the acid layer, but the absorbent material may be blended in both layers. As described above, the structure in which the water absorbing material is further added to the carbonate layer and / or the acid layer has the same effect as the structure shown in FIG. 1A or FIG. Can be dispersed in the thickness direction of the layer due to the presence of the water-absorbing material. Further, the water-absorbing material can gradually permeate moisture. Therefore, when using the carbon dioxide gas generating sheet, the time for starting the reaction between the carbonate and the acid can be widened. As a result, the carbon dioxide gas generating sheet as a whole has a long duration. can do.

  In the layer containing the water-absorbing material, especially when the water-absorbing material is fibrous, the carbonate or acid is easily maintained in the layer due to the presence of the water-absorbing material. Further, the shape of the carbon dioxide generating sheet is easily maintained when the carbonate layer and / or the acid layer contains a water-absorbing material. Therefore, it is possible to improve the yield of carbonate and / or acid during the production, storage and use of the carbon dioxide generating sheet, and prevent powder falling even when subjected to deformation such as folding. be able to. Therefore, loss of the carbon dioxide gas generating agent is prevented, leading to cost reduction. Further, the cost can be reduced by selecting the water-absorbing material itself.

  The configuration of the carbon dioxide generating sheet of the present invention has been described above with reference to FIGS. However, these are merely examples, and other configurations and combinations of the configurations are also included in the scope of the present invention.

  For example, the carbon dioxide generating sheets shown in FIGS. 1A to 1D each include a plurality of layers of water-permeable or water-absorbing sheets 300, but these layers are not necessarily made of the same material.

  For example, the water-permeable or water-absorbent sheet 300 corresponding to the intermediate layer of the carbon dioxide generating sheet may be a water-permeable or water-absorbent sheet 500 (not shown) having high water retention and capable of gradually releasing water inside. Good. In the configuration in which the water-permeable or water-absorbent sheet 500 having such a high water retention property is disposed between the carbonate layer 130 and the acid layer 230, water such as skin lotion applied to one surface at the time of use is reduced in time. Can gradually penetrate into the other surface. Therefore, the reaction start time of the carbonate and the acid can be widened, and the carbon dioxide gas generation as the whole carbon dioxide gas generating sheet can be maintained. The outer layer water-permeable or water-absorbent sheet 300 may also be the same material as the water-permeable or water-absorbent sheet 500 having high water retention used for the intermediate layer.

(Carbonate layer)
The carbonate layer is a layer containing carbonate and / or bicarbonate.

  As carbonate or bicarbonate, when used as a cosmetic, any grade that can be used in cosmetics can be used without any particular limitation. When used for other purposes, no particular grade is specified. For example, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, potassium carbonate, potassium bicarbonate, calcium carbonate, magnesium carbonate, magnesium bicarbonate, calcium bicarbonate, or a derivative thereof can be used. Two or more carbonates and / or bicarbonates may be used in combination. The carbonate and / or bicarbonate is a solid composition, for example, preferably in the form of particles. The carbonate and / or bicarbonate may be in a form supported on a support such as silica. The carbonate and / or bicarbonate may contain water as crystal water. When water of crystallization is included, the solubility in water increases and the reactivity is improved. However, from the viewpoint of storage stability, it is preferable that the carbonate layer does not contain water that causes alteration such as hydrolysis and reaction with an acid. As the carbonate or bicarbonate used in the present invention, particles having an average particle diameter of 5 to 5000 μm are preferable. When the average particle size is 5 to 5000 μm, the dropout of the particles is small, and a good feeling of use can be obtained with an appropriate granular feeling.

  The carbonate layer may further contain a heat-fusible resin in addition to the carbonate and / or bicarbonate particles. In this case, the carbonate and / or bicarbonate particles are fixed in the carbonate layer in a state where a part thereof is covered with the heat-fusible resin. Such a carbonate layer is heated by heat by, for example, disposing a mixture of carbonate and / or bicarbonate particles and a heat-fusible resin on the surface of another layer constituting the carbon dioxide generating sheet. It can be formed by melting a fusible resin.

(Acid layer)
The acid layer is a layer containing a solid acid.

When used as a cosmetic, the acid can be used without particular limitation as long as it is of a grade that can be used in cosmetics, and no special grade is specified when used for other purposes. For example, malonic acid, maleic acid, citric acid, malic acid, tartaric acid, succinic acid, fumaric acid, hyaluronic acid, sodium dihydrogen phosphate or a derivative thereof, a substance that is hydrolyzed to generate an acid, and the like can be used. Two or more acids may be used in combination. The acid is a solid composition, and is preferably in the form of particles, for example. The acid may contain water as crystal water. When water of crystallization is included, the solubility in water increases and the reactivity is improved. However, from the viewpoint of storage stability, it is preferable that the acid layer does not contain water that causes alteration such as hydrolysis and reaction with carbonate. As the acid used in the present invention, particles having an average particle diameter of 5 to 5000 μm are preferable. When the average particle size is 5 to 5000 μm, the dropout of the particles is small, and a good feeling of use can be obtained with an appropriate granular feeling. When the average particle size is reduced, the dissolution rate is increased, and the reaction proceeds immediately after being wetted with water, so that the amount of CO ₂ gas generated in the initial stage of use is increased. Moreover, when using it for skin, a granular feeling can be reduced. On the other hand, increasing the average particle size has the effect of extending the duration of carbon dioxide gas generation because dissolution gradually proceeds when contacted with water. In addition, increasing the average particle diameter has the effect of reducing particle dropout.

  The acid layer may further contain a heat-fusible resin in addition to the acid particles. In this case, the acid particles are fixed in a state where a part thereof is covered with the heat-fusible resin in the acid layer. Such an acid layer is formed by, for example, arranging a mixture of acid particles and a heat-fusible resin on the surface of one of the other layers constituting the carbon dioxide generating sheet, and heat-fusing the resin by heat. It can be formed by melting.

(Heat-fusion resin)
The heat-fusible resin in the present invention serves as a binder for fixing carbonate particles or acid particles in a state where a part of the carbonate particles or acid particles is coated in the carbonate layer and / or acid layer. The heat-fusible resin is, for example, uniformly mixed with carbonate particles or acid particles, placed on the surface of one of the other layers constituting the carbon dioxide generating sheet, heated and melted, In the salt layer and / or the acid layer, the carbonate particles or the acid particles can be fixed in a state of covering a part thereof. The heat-fusible resin can be in the form of particles, fibers, or any other form. The heat-fusible resin is preferably in the form of particles from the viewpoint of uniform mixing with carbonate particles or acid particles in the layer forming step. Moreover, it is desirable that the heat-fusible resin is fibrous from the viewpoint of joining a plurality of carbonate particles or a plurality of acid particles. The heat-fusible resin can be in the form of a shortcut fiber, for example. Various types of heat-fusible resins may be used in combination.

  Examples of the heat-fusible resin include low-density polyethylene (PE) having a melting point of 95 ° C to 130 ° C, high-density polyethylene having a melting point of 120 ° C to 140 ° C, and a homopolymer or block copolymer having a melting point of 160 ° C to 165 ° C. Polypropylene (PP) composed of a polypropylene having a melting point of 135 ° C. to 150 ° C., low melting point polyethylene terephthalate (PET) having a melting point of 110 to 190 ° C., low melting point polyamide having a melting point of 100 to 130 ° C., melting point of 110 ° C. Examples include low-melting polylactic acid having a melting point of ˜150 ° C. and polybutylene succinate having a melting point of 115 ° C. A thermoplastic resin having a melting point exceeding 110 ° C. is preferably used in the present invention. Two or more kinds of heat-fusible resins may be used in combination.

  When the heat-fusible resin is fibrous, the fineness of the heat-fusible fiber is preferably 1 dtex to 120 dtex, and more preferably 1 dtex to 85 dtex. Moreover, it is preferable that the average fiber length of a heat-fusible fiber is 1-100 mm, It is more preferable that it is 1-60 mm, It is further more preferable that it is 2-30 mm. When the fineness and average fiber length of the heat-fusible fiber are within the above ranges, the web layer can be easily formed, and a uniform binding force and a dispersed state can be easily obtained.

  When the heat-fusible resin is in the form of particles, the average particle diameter of the heat-fusible particles is preferably 1 to 1,000 μm, and more preferably 10 to 800 μm. The average particle size of the heat-fusible resin can be appropriately selected within a range in which the carbonate and acid particles to be used are not completely covered.

(Heat-fusion resin composite)
The above heat-fusible resin may be a composite of two or more components. For example, core-sheath fibers in which resins having different melting points are combined, side-by-side fibers using different resins in a cross section perpendicular to the longitudinal direction, and core-shell particles having a core and a shell are included. Among these, core-sheath fibers are preferably used because different types of resins can be easily combined.

  As the core-sheath fiber, a core-sheath fiber whose melting point of the sheath part is lower than the melting point of the core part is preferably used. For example, a PP / PE composite core-sheath fiber provided with a core part made of polypropylene fiber (melting point 160 ° C.) and a sheath part made of polyethylene (melting point 130 ° C.) formed on the outer periphery of the core part can be mentioned.

  Other core sheath fibers include, for example, PET / low melting point PET composite core sheath fiber, high density polyethylene / low density polyethylene composite core sheath fiber, polyethylene / low melting point PET composite core sheath fiber, polyamide / low melting point polyamide composite. Examples include core-sheath fibers, polylactic acid / low melting point polylactic acid composite core-sheath fibers, and polylactic acid / polybutylene succinate composite core-sheath fibers.

  Many common core-sheath fibers have a melting point of the sheath part exceeding 110 ° C., and such core-sheath fibers are preferably used in the present invention.

  When the core-sheath fiber having a lower melting point of the sheath part than the melting point of the core part is used for the carbon dioxide generating sheet of the present invention, when heated to a temperature that is equal to or higher than the melting point of the sheath part and lower than the melting point of the core part, The resin in the sheath part melts and the resin in the core part maintains its shape. As a result, the molten resin in the sheath part retains carbonate and / or bicarbonate in the carbonate layer and / or retains acid in the acid layer, and the water-absorbing material and the fibers in the core part. The effect which binds the structural components of the structure comprised by this is shown. Therefore, the carbon dioxide generating sheet according to the present invention can provide a sheet strength while ensuring a void in the sheet, and can provide a soft and excellent sheet.

  The composite of two or more components as described above can provide heat-fusibility due to the presence of the heat-fusible resin exposed to the outside, and can function as a binder. Therefore, these composites can be blended as a heat-fusible resin in the present invention.

(Water-absorbing material)
In the present invention, a water absorbing material may be contained in at least one of the carbonate layer and the acid layer. Examples of the water-absorbing material include natural fibers such as pulp, hemp, cotton, silk, wool, and mineral fibers, regenerated fibers such as rayon, and synthetic fibers such as polylactic acid and nylon. The water absorbing material can be used, for example, in the form of a defibrated chopped fiber. Two or more water-absorbing materials may be used in combination. Further, as the water-absorbing material, an auxiliary agent in the form of particles such as water-absorbing resin particles can be used. Examples of the water-absorbing resin particles include carboxymethyl cellulose, polyvinyl alcohol, and a polymer absorber (SAP).

  The carbonate or acid can be present dispersed in the layer due to the presence of the water-absorbing material. In addition, the absorbent material of the present invention can absorb and retain water and carbonates or acids dissolved in water when using the carbon dioxide generating sheet, while being able to release slowly. Moisture can be gradually infiltrated in the carbon dioxide generating sheet. Therefore, when using the carbon dioxide gas generating sheet, the time for starting the reaction between the carbonate and the acid can be widened. As a result, the carbon dioxide gas generating sheet as a whole has a long duration. can do.

(Effect promoter)
One or a plurality of effect accelerators can be blended in the carbon dioxide gas generating sheet of the present invention depending on the application.

  Examples of the effect promoter include: oily base, moisturizer, touch improver, surfactant, polymer, thickener / gelator, solvent, propellant, antioxidant, reducing agent, oxidizing agent, preservative , Antibacterial agents, chelating agents, pH adjusters, acids, alkalis, powders, inorganic salts, UV absorbers, whitening agents, vitamins and their derivatives, anti-inflammatory agents, anti-inflammatory agents, hair-growth agents, blood circulation promoters, Stimulants, hormones, anti-wrinkle agents, anti-aging agents, squeeze agents, cooling sensations, warming sensations, wound healing promoters, stimulation relieving agents, analgesics, cell activators, plant / animal / microbe extracts, antipruritics , Exfoliating / dissolving agent, antiperspirant, refreshing agent, astringent, enzyme, nucleic acid, fragrance, pigment, colorant, dye, pigment, metal-containing compound, unsaturated monomer, polyhydric alcohol, polymer additive Anti-inflammatory analgesic, antifungal, antihistamine, hypnotic sedative, tranquilizer, antihypertensive Antihypertensive diuretics, antibiotics, anesthetics, antibacterial substances, antiepileptics, coronary vasodilators, herbal medicines, adjuvants, wetting agents, astringents, thickeners, tackifiers, antipruritics, exfoliating keratins Agents, oily raw materials, UV blockers, antiseptics, antioxidants, liquid matrices, fat-soluble substances, polymeric carboxylates, additives, metal soaps, and the like.

  An effect promoter can be mix | blended with one or both of a carbonate layer and an acid layer, for example. It can also be added to other layers.

(Water-permeable or water-absorbent sheet)
As the water-permeable or water-absorbent sheet 300, an arbitrary sheet can be used among a sheet having a property of passing moisture (water permeability) and a sheet having a property of absorbing moisture (water absorption). As a sheet | seat which has the property (water permeability) which lets a water pass, it is only necessary to let water pass through and there is no limitation. As the sheet having the property of absorbing moisture (water absorption), a sheet that can take in and retain moisture and release the moisture inside can be used. That is, it can be said that the sheet | seat which has the property (water absorption) which absorbs the water | moisture content which can be applied to this invention is a kind of sheet | seat which has the property (water permeability) which lets water pass. The water-permeable or water-absorbent sheet 300 has a water absorption rate of 60 seconds or less, more preferably 30 seconds or less, measured according to the sedimentation rate measurement method defined in JIS L1907 standard. Alternatively, the water absorption (or water passage) speed by the dropping method defined in JIS L1907 standard is 60 seconds or less, and more preferably 30 seconds or less. In the water-permeable or water-absorbent sheet 300, the lower the water absorbency, the faster the water is passed. In the carbon dioxide generating sheet using this, the reaction between the carbonate and the acid proceeds rapidly, and the carbon dioxide is concentrated in a short time. Can be generated automatically. Further, since the water-permeable or water-absorbent sheet 300 has a higher water absorption (moisture retention), the start of the reaction between the carbonate and the acid can be delayed, so the generation of carbon dioxide in the entire carbon dioxide generation sheet. Can be prolonged. The water-permeable or water-absorbent sheet 300 can be, for example, a nonwoven fabric, a cloth, or another sheet having a mesh structure, and can be, for example, a special nonwoven fabric such as Warif (registered trademark).

  As the water-permeable or water-absorbent sheet 500 having high water retention, any sheet having a property capable of gradually releasing moisture passing through or absorbed into the interior over time can be used.

  In addition, for the purpose of imparting design properties and improving the wiping property when used as a cleaning article, the surface of the water-permeable or water-absorbent sheet that is the outer layer of the carbon dioxide generating sheet may be subjected to surface treatment such as unevenness. .

  By using a thick sheet or a low-density sheet as the water-permeable or water-absorbent sheet used on the surface, there is an effect of reducing the graininess appearing on the outer surface of the carbon dioxide generating sheet. On the other hand, if a thin sheet or a sheet with high water permeability and air permeability is used, it is difficult to prevent moisture from entering from the surface of the carbon dioxide generating sheet and releasing the generated carbon dioxide to the outside. Easy to get. A water-permeable or water-absorbent sheet is appropriately selected according to the use and purpose.

(the film)
The film 400 has flexibility such that the carbon dioxide generating sheet can be applied along the skin or a curved surface when in use, and other layers of the carbon dioxide generating sheet, in particular, the water-permeable or water-absorbing sheet 300 Any film having a relatively low air permeability can be used.

The lower the air permeability of the film, the higher the effect of preventing / inhibiting the release of the carbon dioxide gas generated when the carbon dioxide generating sheet is used from the film arrangement side surface. Therefore, it is possible to apply carbon dioxide gas intensively and / or for a long time to the skin or application site by applying the surface opposite to the film placement side to the skin or the site to be cleaned. Has the effect of becoming. On the other hand, if the air permeability is low, stuffiness during use tends to occur, so the film may have an appropriate air permeability. For example, the air permeability measured by the “fabric and knitted fabric test method” defined in Japanese Industrial Standard JIS L1096: 2010 is preferably 200 cm ³ / cm ² / s or less, more preferably 150 cm ³ / cm ² / s. s or less films can be used. This air permeability is the amount of air permeating the film per unit area and unit time when a predetermined pressure is applied, and the larger the value, the higher the air permeability. By using the other layer of the carbon dioxide generating sheet, in particular, a film having a relatively low air permeability as compared with the water-permeable or water-absorbent sheet, the carbon dioxide permeation can be directed.

  Examples of the film include resin films such as polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

(Content ratio of each component)
From the viewpoint of cost, the carbonate and acid in the carbon dioxide generating sheet are preferably used in chemical equivalents, but considering the effect on the skin, the acid is over-blended and the pH after reaction is about 5 It can also be adjusted so that Moreover, the preferable compounding ratio of carbonate and acid may differ depending on the difference in solubility due to factors such as the particle diameter of carbonate and acid, and can be adjusted as appropriate.

  In each of the carbonate layer and the acid layer, the content ratio (mass basis) of the carbonate or acid and the heat-fusible resin can be, for example, 2/98 to 98/2, and 5/95 to 95 / 5 and can be 10/90 to 90/10. When the ratio is in the above range, the carbonate and acid in the in-plane direction of the carbon dioxide generating sheet can be blended uniformly, and powder falling can be suppressed.

  When each of the carbonate layer and the acid layer further contains a water-absorbing material, the content ratio (mass basis) of the carbonate or acid, the heat-fusible resin, and the absorbent material is, for example, 2/49 / 49-96 / 2/2, 6/47 / 47-94 / 3/3, and 10/45 / 45-90 / 5/5. When the ratio is in the above range, the carbonate and the acid can be uniformly disposed in the in-plane direction of the carbon dioxide generating sheet, and can be dispersed in the layer due to the presence of the water-absorbing material. it can. In addition, the absorbent material of the present invention can absorb and retain water and carbonates or acids dissolved in water when using the carbon dioxide generating sheet, while being able to release slowly. Moisture can be gradually infiltrated in the carbon dioxide generating sheet. Therefore, when using the carbon dioxide gas generating sheet, the time for starting the reaction between the carbonate and the acid can be widened. As a result, the carbon dioxide gas generating sheet as a whole has a long duration. can do.

  In addition, an appropriate amount of one or more effect promoters can be blended in one or more of the carbonate layer, acid layer, and other layers.

(Basis weight)
The basis weight of the carbon dioxide generating sheet can be appropriately set according to the application. For example, it is preferably 30 to 300 g / m ² .

<Method for producing carbon dioxide generating sheet>
As a method for producing a carbon dioxide generating sheet of the present invention, for example, a uniform mixture of acid particles or carbonate particles and a heat-fusible resin such as polyethylene (PE) on a carrier sheet for conveying a web layer. And a web layer serving as a water-permeable or water-absorbent sheet is laminated thereon, and further, a carbonate particle or acid particle and a heat-fusible resin such as polyethylene (PE) are uniformly formed thereon. There is a method in which a mixture is disposed, a carrier sheet is further disposed thereon, and the heat-fusible resin is melted by heat treatment and joined. At this time, the water-permeable or water-absorbent sheet of the present invention may be used for the carrier sheet to obtain a carbon dioxide generating sheet having the layer structure according to the present invention. Moreover, you may obtain the carbon dioxide generating sheet | seat which has the layer structure which concerns on this invention using the arbitrary films whose air permeability is comparatively low compared with another layer for one of the carrier sheets. The carrier sheet is not essential in the present invention, and may be peeled off from the formed laminate after the heat treatment. In order to prevent the reaction between the carbonate and the acid during production, in the present invention, these laminations are performed by a dry method. As another embodiment, for example, there is a method using a web forming apparatus that employs an airlaid method.

(Manufacturing method of carbon dioxide generating sheet using airlaid method)
The method for producing a carbon dioxide generating sheet of this embodiment that employs the airlaid method includes a defibrating step, a mixing step, a web forming step, and a binding step.

(Defibration process)
The defibrating step is a step of defibrating a shortcut fiber by defibrating a heat-fusible resin in the form of a shortcut fiber with an air flow.

  In the defibrating method using the air flow of the shortcut fiber, an air flow is formed by a blower or the like, the shortcut fiber is supplied to the air flow, and the fiber is defibrated by the stirring effect of the air flow.

  As a defibrating method, it is preferable to defibrate with a swirling air flow. According to the defibrating method using the swirling air flow, the shortcut fiber can be sufficiently defibrated, and the dispersibility of the defibrated shortcut fiber can be further increased when forming the air laid web by the air laid method. .

  As a defibrating method using a swirling air flow, for example, a method of putting a shortcut fiber into the blower and defibrating with the blower can be mentioned. Further, there is a method in which air is sent along a circumferential direction in a cylindrical container by a blower to form a swirling flow, a shortcut fiber is supplied into the swirling flow, and stirring to defibrate.

  The flow rate of the air flow is appropriately selected according to the amount of the shortcut fiber, but is usually in the range of 10 to 150 m / sec.

(Mixing process)
The mixing step is a step of obtaining a web raw material by mixing a heat-fusible resin in the form of a defibrating shortcut fiber and carbonate or acid. At this time, any other material can be mixed at the same time. The shape of any other material may be fibrous or particulate. Examples of arbitrary other materials include auxiliary agents added as necessary, such as water-absorbing resin particles and effect accelerators. There is no particular limitation on the order of addition of these materials, and these materials can be added by, for example, spraying or the like in a step after the mixing step.

  In mixing, in order to improve the dispersibility of the defibrating shortcut fiber, it is preferable to stir the defibrating shortcut fiber and carbonate or acid. However, in order to prevent breakage of the defibration shortcut fiber, it is preferable to apply stirring using an air flow instead of stirring using mechanical shearing force.

  The mixing step may be after the defibrating step or at the same time as the defibrating step. When the mixing step is performed simultaneously with the defibrating step, the defibrating shortcut fiber and carbonate or acid are mixed using an air flow in the defibrating step. Further, carbonate or acid powder may be added to the web forming line of the defibrating shortcut fiber in the particle spraying step described later and mixed.

(Web formation process)
A web formation process is a process of obtaining an airlaid web from a web raw material by the airlaid method. Here, the airlaid method is a method of forming a web by randomly depositing fibers three-dimensionally using an air flow.

(Particle spraying process)
The particle spraying step is a step of blending the powder into the web raw material by a known method. Either a method of forming a web by mixing powder with fibers or a method of dispersing on the surface of the web or carrier sheet may be used.

  In the web forming process in the present embodiment, for example, a web forming apparatus 1 shown in FIG. 2 is used. The web forming apparatus 1 includes a conveyor 10, a gas permeable endless belt 20, a fiber mixture supply unit 30, a first carrier sheet supply unit 40, a second carrier sheet supply unit 50, and a suction box 60.

  Here, the conveyor 10 includes a plurality of rollers 11. The air permeable endless belt 20 is mounted on the conveyor 10 and rotates. The fiber mixture supply means 30 supplies the fiber mixture to the gas permeable endless belt 20 together with the air flow. The first carrier sheet supply means 40 supplies the first carrier sheet 41 toward the gas permeable endless belt 20. The second carrier sheet supply means 50 supplies the second carrier sheet 51 toward the first carrier sheet 41 that has passed through the air-permeable endless belt 20. The suction box 60 sucks the air permeable endless belt 20 from the inside thereof.

  In the web forming apparatus 1, the fiber mixture supply means 30 is installed above the air permeable endless belt 20, the first carrier sheet supply means 40 is installed upstream of the air permeable endless belt 20, and the second carrier sheet. The supply means 50 is installed downstream of the air permeable endless belt 20.

  In the web forming process using the web forming apparatus 1, the rollers 10 are rotated in the same direction to drive the conveyor 10 and rotate the air permeable endless belt 20. Further, the first carrier sheet 41 is fed out from the first carrier sheet supply means 40 so as to come into contact with the permeable endless belt 20.

  Next, while sucking the permeable endless belt 20 by the suction box 60, the fiber mixture is lowered together with the air flow from the fiber mixture supply means 30, and the fiber mixture is dropped onto the first carrier sheet 41 on the permeable endless belt 20. , Deposit. Thereby, the air laid web A is formed.

  Next, the second carrier sheet 51 is supplied from the second carrier sheet supply means 50 on the air laid web A to obtain an air laid web-containing laminated sheet.

(Binding process)
As the binding method, it is preferable to use a thermal bond method from the viewpoint of binding without using water. The binding step by the thermal bond method is a step of heat-treating the air laid web and binding the defibrating shortcut fibers with a heat-fusible resin.

  Examples of the heat treatment of the air laid web include hot air treatment and infrared irradiation treatment, and hot air treatment is preferable from the viewpoint of low cost of the apparatus.

  As the hot air treatment, the air laid web is contacted with a through air dryer provided with a rotating drum having air permeability on the peripheral surface and heat treated (hot air circulating rotary drum method), and the air laid web is passed through a box type dryer. Examples include a method of heat treatment by passing hot air through an air laid web (hot air circulation conveyor oven method).

  When the air laid web is sandwiched between the first carrier sheet and the second carrier sheet as in the present embodiment to form a laminated sheet, the laminated sheet may be subjected to hot air treatment. The first carrier sheet and the second carrier sheet can be peeled from the air laid web after the hot air treatment. The heat treatment temperature may be a temperature at which the heat-fusible resin melts. For example, when using materials such as PP and PE that are generally used for thermal bonding, it is desirable to set the heating temperature to 115 ° C. or higher.

  After the binding step, it may be compressed through a heating roll for the purpose of finely adjusting the thickness and density of the carbon dioxide generating sheet.

(Function and effect)
In the above production method, the carbonate or acid particles and the heat-fusible resin can be blended uniformly. Therefore, gas can be generated uniformly in the in-plane direction of the sheet.

  By blending the carbonate or acid with the heat-fusible resin, the carbonate or acid can be firmly fixed with the heat-fusible resin as a binder in the carbon dioxide generating sheet, so that powder falling can be prevented. .

(Use of carbon dioxide generation sheet)
Below, the use of the carbon dioxide gas generation sheet concerning the present invention is illustrated.

  The carbon dioxide generating sheet can be used for (1) protection, (2) medical use, (3) building materials and civil engineering, (4) hygiene use, (5) wiper use, (6) agriculture and horticulture, ( 7) For household materials, (8) For industrial materials, (9) For experimental materials.

  (1) Examples of protection include protective equipment. A specific example of the protective article is a mask.

  (2) Examples of medical use include gauze, masks, sheets, antibacterial mats, poultice base cloths, poultice base cloths, and hyperalgesia syndrome treatment agents.

  (3) Examples of building materials and civil engineering include water shielding sheets, protective materials, and anti-corrosion materials.

  (4) Examples of hygiene include diapers, sanitary products, first aid products, cleaning products, towels, masks, and the like. A specific example of the diaper is a paper diaper. Specific examples of the sanitary product include a napkin and a tampon. Specific examples of the emergency supplies include gauze, first-aid plasters, and cotton swabs. Specific examples of the cleansing products include wet tissues, cosmetic cotton, breast milk pads, wiping sheets, sweat absorption sheets (for face, side, neck, feet, etc.), antibacterial / antibacterial sheets, antiviral sheets, Anti-allergen sheets, antibacterial deodorizing sheets, and the like. A specific example of the mask is a disposable three-dimensional mask.

  (5) Examples of wipers include wipers, wet wipers, oil strainers, and copier cleaning materials.

  (6) As agriculture / horticulture, for example, a nursery sheet, a bedding sheet, a defrosting sheet, a herbicidal sheet, a horticultural planter and the like can be mentioned. When used for agriculture and horticulture, for example, it can be used to create an anaerobic environment and perform forcing cultivation.

  (7) Examples of household materials include packaging materials, cleaning products, bags, foods, household goods, kitchenware, sports equipment, beauty materials, and the like. Specific examples of the cleaning article include a wiper, a chemical cloth, and a scrubber. A specific example of the bag is a desiccant bag. Specific examples of the food include tea bags, coffee bags, food bags, freshness maintaining materials, food-absorbing sheets, carbonic acid injection agents, food additives, and the like. Specific examples of the household goods include bathing agents, eye masks, cooling sheets, warming sheets, neck scarves, gloves, deodorizing sheets, and fragrance base materials. Specific examples of the kitchenware include a draining sheet, a fire extinguishing cloth, and the like. A specific example of the sports equipment is a fatigue recovery material. Beauty materials include face masks, puffs, beauty packs, beauty gloves, and the like.

  (8) Examples of industrial materials include industrial materials, electrical materials, batteries, product materials, OA equipment, AV equipment, rolls, equipment members, and the like.

  (9) Examples of the experimental material include an anaerobic environment forming material, an anesthetic agent, and an insect attractant.

  The carbon dioxide generating sheet of the present invention can be suitably used for applications such as beauty sheets, living material sheets, medical and sanitary sheets such as gauze, cleaning sheets, and wipers. In addition, the same carbon dioxide gas generating sheet can be used in various fields and applications without being limited to the above classification.

  EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to a following example.

[Example 1]
<Manufacture of carbon dioxide generating sheet>
Short-cut rayon fiber (fineness 3.3 dtex, fiber length 5 mm) and shortcut core-sheath type heat-sealable composite fiber (PET / PE composite core-sheath fiber, sheath melting point 130 ° C.) Each fiber defibrating shortcut fiber was obtained by defibrating using an airflow defibrating apparatus.

  Next, the rayon fiber in the form of a defibration shortcut fiber and the heat-fusible composite fiber in the form of a defibration shortcut fiber are uniformly mixed at a ratio (mass ratio) of 70/30 by an air flow, and rayon / ( PET / PE) fiber mixture was obtained.

  Citric acid and polyethylene (PE) powder were mixed at a ratio (mass ratio) of 80/20 to obtain a particle mixture of citric acid / PE powder. Similarly, sodium hydrogen carbonate and PE powder were mixed at a ratio (mass ratio) of 80/20 to obtain a particle mixture of sodium hydrogen carbonate / PE powder.

  Then, after a particle mixture of citric acid / PE powder was spread on the carrier sheet, a sheet on which an airlaid web was formed from the fiber mixture was obtained using the web forming apparatus 1 shown in FIG.

Specifically, a rayon spunlace nonwoven fabric (basis weight: 28 g / m ² , air permeability: 292 cm ³ / cm) is formed on the air-permeable endless belt 20 mounted on the conveyor 10 by the first carrier sheet supply means 40. The first carrier sheet 41 composed of ² / s) was fed out.

While sucking the air-permeable endless belt 20 by the suction box 60, a particle mixture of citric acid / PE powder is sprayed on the first carrier sheet 41 so as to be 50 g / m ^2, and the fiber mixture is applied thereon. The fiber mixture was dropped and deposited together with the air flow from the supply means 30. At that time, the fiber mixture was supplied so that the basis weight of the shortcut fiber per air laid web portion was 30 g / m ² .

Next, a particle mixture of sodium hydrogen carbonate / PE powder was sprayed on the airlaid web to a concentration of 50 g / m ² and deposited. A second carrier sheet 51 made of rayon spunlace nonwoven fabric (basis weight 28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated thereon to obtain an airlaid web-containing laminated sheet.

The obtained laminated sheet was passed through a hot air circulating conveyor oven-type box type dryer and treated with hot air at 140 ° C. to obtain a carbon dioxide generating sheet having a basis weight of 186 g / m ² .

[Example 2]
<Manufacture of carbon dioxide generating sheet>
Citric acid, PE powder and carboxymethyl cellulose were mixed at a ratio (mass ratio) of 60/20/20 to obtain a particle mixture of citric acid / PE powder / carboxymethyl cellulose. Similarly, sodium hydrogen carbonate, PE powder and carboxymethyl cellulose were mixed at a ratio (mass ratio) of 60/20/20 to obtain a particle mixture of sodium hydrogen carbonate / PE powder / carboxymethyl cellulose, and then 66.7 g of each layer. except for spraying so that / m ^2, thereby obtaining the carbon dioxide generating sheet having a basis weight 219.4G / m ² in the same manner as in example 1.

[Example 3]
<Manufacture of carbon dioxide generating sheet>
Short-cut rayon fiber (fineness 3.3 dtex, fiber length 5 mm) and shortcut core-sheath type heat-sealable composite fiber (PET / PE composite core-sheath fiber, sheath melting point 130 ° C.) Each fiber defibrating shortcut fiber was obtained by defibrating using an airflow defibrating apparatus.

  Next, the rayon fiber in the form of a defibration shortcut fiber and the heat-fusible composite fiber in the form of a defibration shortcut fiber are uniformly mixed at a ratio (mass ratio) of 50/50 by an air flow, and rayon / ( PET / PE) fiber mixture was obtained.

  Sodium hydrogen carbonate and PE powder were mixed at a ratio (mass ratio) of 80/20 to obtain a particle mixture of sodium hydrogen carbonate / PE powder.

  Subsequently, the sheet | seat which formed the air laid web using the fiber mixture and the citric acid was obtained on the carrier sheet using the web formation apparatus 1 shown in FIG.

Specifically, a rayon spunlace nonwoven fabric (basis weight: 28 g / m ² , air permeability: 292 cm ³ / cm) is formed on the air-permeable endless belt 20 mounted on the conveyor 10 by the first carrier sheet supply means 40. The first carrier sheet 41 composed of ² / s) was fed out.

While sucking the air-permeable endless belt 20 by the suction box 60, the fiber mixture and citric acid are mixed with the air flow from the fiber mixture supply means 30 onto the first carrier sheet 41 in a ratio of 50/50 (mass ratio). The mixture was dropped and deposited with mixing. At that time, the fiber mixture and citric acid were supplied so that the basis weight per air laid web portion was 100 g / m ² .

Next, a second carrier sheet made of rayon spunlace nonwoven fabric (basis weight 28 g / m ² , air permeability 292 cm ³ / cm ² / s) is laminated on the air laid web, and particles of sodium hydrogen carbonate / PE powder are laminated thereon. The mixture was spread and deposited to 50 g / m ² . A third carrier sheet made of rayon spunlace nonwoven fabric (basis weight 28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated thereon to obtain an airlaid web-containing laminated sheet.

The obtained laminated sheet was passed through a hot air circulating conveyor oven type box-type dryer and treated with hot air at 140 ° C. to obtain a carbon dioxide generating sheet having a basis weight of 234 g / m ² .

[Example 4]
<Manufacture of carbon dioxide generating sheet>
A carbon dioxide gas generating sheet having a basis weight of 186 g / m ² is obtained in the same manner as in Example 1 except that pulp (NBKP) is used instead of the rayon fiber (fineness 3.3 dtex, fiber length 5 mm) of the defibration shortcut fiber. It was.

[Example 5]
<Manufacture of carbon dioxide generating sheet>
Short-cut rayon fiber (fineness 3.3 dtex, fiber length 5 mm) and shortcut core-sheath type heat-sealable composite fiber (PET / PE composite core-sheath fiber, sheath melting point 130 ° C.) Each fiber defibrating shortcut fiber was obtained by defibrating using an airflow defibrating apparatus.

  Next, the rayon fiber in the form of a defibration shortcut fiber and the heat-fusible composite fiber in the form of a defibration shortcut fiber are uniformly mixed at a ratio (mass ratio) of 50/50 by an air flow, and rayon / ( PET / PE) fiber mixture was obtained.

  Citric acid and PE powder were mixed at a ratio (mass ratio) of 80/20 to obtain a particle mixture of citric acid / PE powder.

  Subsequently, the sheet | seat which formed the air laid web on the carrier sheet using the fiber mixture and sodium hydrogencarbonate using the web formation apparatus 1 shown in FIG. 2 was obtained.

Specifically, a rayon spunlace nonwoven fabric (basis weight: 28 g / m ² , air permeability: 292 cm ³ / cm) is formed on the air-permeable endless belt 20 mounted on the conveyor 10 by the first carrier sheet supply means 40. The first carrier sheet 41 composed of ² / s) was fed out.

While sucking the air-permeable endless belt 20 by the suction box 60, the fiber mixture and sodium bicarbonate are mixed onto the first carrier sheet 41 together with the air flow from the fiber mixture supply means 30 in a ratio of 50/50 (mass). The mixture was dropped and deposited while mixing to a ratio. At that time, the fiber mixture and sodium bicarbonate were supplied so that the basis weight per air laid web portion was 100 g / m ² .

Next, a second carrier sheet made of rayon spunlace nonwoven fabric (basis weight 28 g / m ² , air permeability 292 cm ³ / cm ² / s) is laminated on the airlaid web, and a citric acid / PE powder particle mixture is laminated thereon. Was sprayed and deposited at 50 g / m ² . A third carrier sheet made of rayon spunlace nonwoven fabric (basis weight 28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated thereon to obtain an airlaid web-containing laminated sheet.

The obtained laminated sheet was passed through a hot air circulating conveyor oven type box-type dryer and treated with hot air at 140 ° C. to obtain a carbon dioxide generating sheet having a basis weight of 234 g / m ² .

[Example 6]
A tissue (basis weight 14 g / m ² ) is laminated instead of the third carrier sheet, 5 g EVA hot melt resin is applied thereon, and a PE film (basis weight 40 g / m ² ) is pasted. Obtained a carbon dioxide generating sheet having a basis weight of 265 g / m ^{2 in} the same manner as in Example 5.

[Example 7]
<Manufacture of carbon dioxide generating sheet>
Citric acid and PE powder were mixed at a ratio (mass ratio) of 50/50 to obtain a particle mixture of citric acid / PE powder.

  Sodium hydrogen carbonate and PE powder were mixed at a ratio (mass ratio) of 50/50 to obtain a particle mixture of sodium hydrogen carbonate / PE powder.

  After spraying the citric acid / PE powder particle mixture on the carrier sheet, stacking the carrier sheet, spraying the sodium bicarbonate / PE powder particle mixture, and further stacking the carrier sheet to obtain a carbon dioxide generating sheet It was.

Specifically, on the permeable endless belt 20 travels is mounted to the conveyor 10, the first carrier sheet supply means 40, rayon spun lace nonwoven fabric (28 g / m ^2, air permeability of 292cm ³ / cm ² / The first carrier sheet 41 made of s) was fed out.

While sucking the air-permeable endless belt 20 by the suction box 60, a particle mixture of citric acid / PE powder is sprayed on the first carrier sheet 41 so as to be 80 g / m ^2, and the second carrier sheet. A rayon spunlace nonwoven fabric (28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated.

Next, a particle mixture of sodium hydrogen carbonate / PE powder was sprayed on the second carrier sheet to 80 g / m ² and deposited. A third carrier sheet 51 made of rayon spunlace nonwoven fabric (28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated thereon to obtain a laminate.

The obtained laminated sheet was passed through a hot air circulating conveyor oven type box type dryer and treated with hot air at 140 ° C. to obtain a carbon dioxide generating sheet having a basis weight of 244 g / m ² .

[Comparative Example 1]
<Manufacture of carbon dioxide generating sheet>
After the citric acid was sprayed on the carrier sheet, the carrier sheets were laminated and sodium bicarbonate was sprayed, and then the carrier sheets were further laminated to obtain a carbon dioxide generating sheet.

Specifically, on the permeable endless belt 20 travels is mounted to the conveyor 10, the first carrier sheet supply means 40, PET spun-bonded nonwoven fabric (28 g / m ^2, air permeability of 292cm ³ / cm ² / The first carrier sheet 41 made of s) was fed out.

While sucking the air-permeable endless belt 20 with the suction box 60, citric acid was sprayed onto the first carrier sheet 41 so as to be 40 g / m ^2, and the second carrier sheet rayon spunlace nonwoven fabric (28 g / M ² , air permeability 292 cm ³ / cm ² / s).

Next, sodium hydrogen carbonate was sprayed on the second carrier sheet so as to be 40 g / m ² and deposited. A third carrier sheet 51 made of PET spunbonded nonwoven fabric (28 g / m ² , air permeability 292 cm ³ / cm ² / s) was laminated thereon to obtain a laminate.

Next, a sample with a width of 100 mm and a length of 200 mm was cut out from the laminate, and the four corners were heat-sealed at 170 ° C. As a result, a carbon dioxide generating sheet having a basis weight of 164 g / m ² was obtained.

  The following measurements and evaluations were performed on the carbon dioxide generating sheets obtained in the examples and comparative examples.

(Measurement of gas generation time of carbon dioxide generation sheet)
The obtained carbon dioxide generating sheet was cut into a width of 100 mm and a length of 200 mm to prepare a test piece. Place the test piece in a 500 ml flask, add 500 ml of distilled water, cover with a rubber stopper connected to the tube, put the tip of the tube into the water tank, and measure the bubble generation time from the tip of the tube. did.

(Evaluation of uniformity of carbon dioxide generation sheet)
The obtained carbon dioxide generating sheet was cut into a width of 100 mm and a length of 200 mm to prepare a test piece. Water was put into the bat, the test piece was immersed, the state of bubble generation was visually confirmed, and evaluation was performed as follows.
◎: Bubbles are generated uniformly over the entire surface. ○: Bubbles are generated uniformly over the entire surface. △: There are places where bubbles are not easily generated. ×: Locations where bubbles are generated and where bubbles are not generated. Clearly

(Evaluation of powder falling on carbon dioxide generation sheet)
The obtained carbon dioxide generating sheet was cut into a width of 100 mm and a length of 200 mm to prepare a test piece. The test piece was lightly shaken on the test bench, and the powder dropped on the test bench was visually evaluated.
◎: Almost no powder falling ○: Little powder falling △: Some powder falling ×: Many powder falling

(Texture evaluation of carbon dioxide generation sheet)
The obtained carbon dioxide generating sheet was cut into a width of 100 mm and a length of 200 mm to prepare a test piece. It was applied to the back of the hand in a dry state, and the texture was evaluated by checking the touch.
◎: Soft and very good texture ○: Slightly soft and good texture △: Slightly wrinkled ×: Wrinkled, poor texture

(Evaluation results)
Table 1 shows the results of measurement and evaluation tests.

  The carbon dioxide gas generating sheet of the present invention has a longer duration of carbon dioxide gas generation as a whole sheet than the carbon dioxide gas generating sheet of the comparative example. In the carbon dioxide gas generating sheet of the present invention, bubbles were generated uniformly or almost uniformly over the entire surface of the sheet. In addition, the carbon dioxide generating sheet of the present invention had less powder falling off. Furthermore, when the carbon dioxide generating sheet of the present invention contains a water-absorbing material in the carbonate layer and / or the acid layer, the touch is soft and the texture is good.

DESCRIPTION OF SYMBOLS 1 Web formation apparatus 13 Carbonate particle 16 Heat-fusion resin 23 Acid particle 30 Fiber mixture supply means 41 1st carrier sheet 51 2nd carrier sheet A Airlaid web 100 Carbonate layer 130 containing a water-absorbing material 130 Carbonate layer 200 Acid layer 230 containing water-absorbing material Acid layer 300, 500 Water-permeable or water-absorbent sheet 400 Film

Claims (3)

A laminate comprising a carbonate layer and an acid layer,
A water-permeable or water-absorbent sheet is provided between the carbonate layer and the acid layer,
In the carbonate layer and the acid layer, a mixture of carbonate particles or acid particles and a heat-fusible resin is disposed on the surface of the water-permeable or water-absorbent sheet, and the heat-fusible resin is melted by heat. A carbon dioxide gas generating sheet obtained by the above method.   The said heat-fusible resin contains resin selected from the group which consists of particulate heat-fusible resin, fibrous heat-fusible resin, and these mixtures. Carbon dioxide generation sheet.   The carbon dioxide generating sheet according to claim 1 or 2, wherein at least one of the carbonate layer and the acid layer contains a water-absorbing material.