JP2010002154A - Warming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warming device having electromagnetic wave shielding performance and capable of shortening a current-carrying time with respect to a heating element such as an electrical blanket by the heat retaining performance. <P>SOLUTION: The warming device is provided with the heating element 300 generating heat by current-carrying and with a heat storage sheet 100 superposed on the heating element 300 and used. The heat storage sheet 100 has a bag body and water-containing gel sealed in the bag body. Since the heat storage sheet 100 is arranged, even if current-carrying to the heating element 300 is stopped, since warmth is maintained for a predetermined time, warming can be performed without being affected by electromagnetic waves and the current-carrying time can be shortened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heating device including a heating element such as a sheet heating element including an electric blanket, an electric carpet, an electric cushion, an electric anchor, an electric foot warmer, and a conductive layer, and a heat storage sheet containing a hydrous gel.

  The heating element is heated by energization during use. Electromagnetic waves are also generated during energization, but in recent years, adverse effects on human bodies due to electromagnetic waves have become a problem. Therefore, there is an urgent need for development of a technique for effectively shielding or blocking electromagnetic waves emitted by electrical appliances.

  For example, Patent Document 1 discloses a sheet structure for a warming device provided with a sheet-like material mixed with carbon or carbon fiber. The sheet-like material is a non-woven fabric or paper made of non-woven fabric, paper, cloth or woven fabric containing carbon or carbon fiber, or manufactured using only carbon fiber as a raw material. Carbon or carbon fiber has the effect of shielding electromagnetic waves, and also has the effect of receiving heat from the heating element of the warming device and emitting far infrared rays to improve the heat retention effect.

  On the other hand, there is a strong demand for energy conservation in modern society. From such a viewpoint, Patent Document 2 discloses a heat storage / cold storage sheet in which a heat storage agent (cold storage agent) that is liquid or semi-fluid in an operating temperature range is enclosed in a bag, and the heat storage agent (cold storage agent). ) Is held and encapsulated by a flexible mesh-like support structure (for example, a liquid-absorbing polymer sheet or a honeycomb structure). This heat storage / cold storage sheet is used together with a conductive material printed body which is a planar heating element. When this heat storage / cold storage sheet is used, for example, in a car or the like, the sheet heating element is heated during engine operation, and the heat is stored in the heat storage / cold storage sheet. A warming (heating) effect by a heat storage / cold storage sheet is obtained.

JP 2001-99432 A JP 2000-325384 A

  The sheet structure described in Patent Document 1 has been developed mainly for the purpose of shielding electromagnetic waves. Therefore, it cannot be said that the heat retention performance after the energization of the heating element is stopped is sufficient. Further, since the sheet-like material in the sheet structure is made of nonwoven fabric, paper, cloth, or woven fabric, it does not have cushioning performance.

  On the other hand, the heat storage / cold storage sheet described in Patent Document 2 has been developed mainly for heat insulation (cold insulation) properties, and electromagnetic shielding properties are not considered in the development.

  An object of the present invention is, for example, a warming device having a function of an electric blanket or the like, which has an electromagnetic shielding property, and can reduce the energization time for a heating element such as an electric blanket by the heat retention performance of the heat storage sheet. It is to provide.

  Another object of the present invention is to provide a warming device having both cushioning properties and low resilience in addition to the above properties.

  The present inventor diligently studied to solve the above-mentioned problems and completed the following present invention.

  That is, the present invention is a heating device comprising a heating element that generates heat when energized and a heat storage sheet that is used over the heating element, the heat storage sheet comprising a bag and a hydrous gel enclosed therein And a warming device.

  The warming device of the present invention may further have a heat insulating sheet, or the heating element may have a heat insulating layer on one surface thereof.

  The heating element includes a planar heating element. When the heating element is a planar heating element, the heat insulating sheet and the heat insulating layer are arranged on a surface that does not face the heat storage sheet.

  The planar heating element includes those generated by a wire heater and those generated by a conductive layer coupled to an electrode. Specific examples of the planar heating element that generates heat by the wire heater include an electric blanket, an electric carpet, and an electric cushion. A specific example of the planar heating element that generates heat by the conductive layer coupled to the electrode is a seat.

The planar heating element is preferably such that the area of the portion surrounded by the outermost periphery of the wire heater or the conductive layer is 60% or more of the area of the hydrous gel layer of the heat storage sheet. In addition, it is preferable that the planar heating element has an area of a portion of 0.2 to 1.5 m ² formed by being surrounded by the outermost one of the wire heaters.

  The heat storage sheet is “used to overlap the heat generating element”, but this is not limited to the case where the heat generating element and the heat storage sheet are in direct contact. For example, a case where an electric blanket that is a heating element is covered with a wrapping cloth, and a heat storage sheet is used in an overlapping manner on the electric blanket (heating element) covered with the wrapping cloth is also included. Further, the heat storage sheet and the heating element may be covered with a separate protective cover.

  The bag body has flexibility. Therefore, it is preferable that it is comprised with various polymer sheets, or in the case of a multilayer structure, at least one layer is comprised with the polymer sheet.

Moreover, a bag body shall have the water vapor | steam barrier sheet | seat layer whose moisture permeability in JISZ0208 (cup method; 40 degreeC; 90% RH) is 30 g / m < ² > * 24 hours or less on each of both surfaces. preferable.

  The water content of the hydrogel is preferably 10 to 99.9% by weight.

  It is preferable that the water-containing gel further contains 2 to 10% by weight of a substance having electromagnetic wave shielding properties based on the total amount of the water-containing gel.

Particularly when the heating element is an electric blanket, it is preferred that the hydrogel has a jelly strength of 10 to 3,000 g as measured under the following conditions:
(Jelly strength measurement conditions)
Measuring device: Compression type physical property measuring device Measuring atmosphere condition: 20 ° C., 65% RH
Compressed shape and area: 30 mm diameter circle, 7.065 cm ²
Compression amount (displacement amount): 2 mm
Compression speed: 1 mm / sec. Size of measurement sample: 5 cm × 5 cm × 6 mm (thickness).

  The jelly strength of 10 to 3,000 g is, for example, when the hydrated gel contains a cross-linked product of polyacrylic acids, and the amount of polyacrylic acids based on the total amount of the hydrated gel preparation composition. Is 1 to 10% by weight, the amount of crosslinking agent is 0.01 to 0.5% by weight, the amount of crosslinking retarder is 0.02 to 0.2% by weight, and the amount of water is 50 to This is accomplished by preparing from a composition that is 95% by weight.

  Especially when the heating element is an electric carpet or an electric cushion, it is preferable that the hydrogel has a jelly strength of 400 to 5,000 g as measured under the above conditions.

  The jelly strength of 400 to 5,000 g is, for example, when the hydrated gel contains a cross-linked product of polyacrylic acids, and the amount of polyacrylic acids based on the total amount of the hydrated gel preparation composition. Is 3 to 8% by weight, the amount of crosslinking agent is 0.06 to 2.0% by weight, the amount of crosslinking retarder is 0.02 to 0.5% by weight, and the amount of water is 50 to This is accomplished by preparing from a composition that is 95% by weight.

  Since the warming device of the present invention is provided with a heat storage sheet, if the warming device of the present invention is used, the warmth is maintained for a predetermined time even after the power supply to the heating element is stopped. Therefore, the energization time to the heating element is shortened, contributing to energy saving.

  After the energization is stopped, no electromagnetic wave is generated from the heating element. The warming device of the present invention can be used even after the energization is stopped. Therefore, the warming device of the present invention can warm without being adversely affected by electromagnetic waves.

  The warming device of the present invention is provided with a heat storage sheet having electromagnetic wave shielding performance. Therefore, even if the heating device of the present invention is used while energizing the heating element, it is difficult to be adversely affected by electromagnetic waves.

  The heat storage sheet in the warming device of the present invention can give a cool feeling when it is not heated. That is, if the heating device of the present invention is used without energizing the heating element in summer or the like, a cool feeling can be obtained. Therefore, in summer, for example, if the warming device of the present invention is laid on a mattress and sleeps, or if the warming device of the present invention is used as a carpet, the use of the cooling device can be omitted or the usage time thereof can be reduced. Therefore, also from this viewpoint, the heating device of the present invention contributes to energy saving.

  Among the warming devices of the present invention, when the heat storage sheet has cushioning properties and low resilience, for example, the body pressure is dispersed at bedtime by laying it on a mattress. Thereby, human body fatigue is reduced and it can spend comfortably. More specifically, effects such as improvement of back pain can be obtained.

  Hereinafter, the present invention will be described based on the best mode for carrying out the invention. First, an example of the warming device of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of the warming device of the present invention, and FIG. 2 is a sectional view taken along line xx.

  In the warming device 1,000 of the present invention, the heat storage sheet 100 is overlaid on the electric blanket 300 having the temperature controller 20 and the cord 30, which is a heating element that generates heat when energized. The heat storage sheet 100 includes a bag body 10 having surfaces 1 and 3 and a hydrated gel 5 enclosed therein.

  In the warming device 1,000 of the present invention, the heat storage sheet 100 may only be placed on the electric bed blanket 300, or may be coupled to the electric bed blanket 300 with an adhesive or the like. Alternatively, there may be inclusions such as bedding between the heat storage sheet 100 and the electric bedding 300.

  Here, “a heating element that generates heat when energized” means an electrical appliance that achieves the intended use of the product by generating heat, specifically, an electric blanket, an electric carpet, an electric cushion, an electric ankle, an electric foot temperature, etc. Says a vessel. Such a heating element includes a planar heating element that generates heat by a wire heater. Specific examples of the planar heating element that generates heat by a wire heater include an electric blanket, an electric carpet, and an electric cushion.

  Further, “a heating element that generates heat when energized” includes a sheet heating element including a conductive layer coupled to an electrode. A specific example of such a planar heating element is a seat seat that is used by energizing a battery of an automobile such as a truck.

  The configuration of the heating element described above conforms to the configuration of a normal product. For example, the electric carpet has a cord-like heater wire (that is, a wire heater) embedded in a non-woven fabric layer, and a cover is provided on one surface of the non-woven fabric layer and heat insulation is provided on the other surface. The material is arranged. The cover may be a separate body. The electric blanket is configured such that, for example, a cord-like heater wire is folded between two felt fabrics.

  The configuration of a seat used by energizing a battery of an automobile is described as a conductive material print in, for example, Japanese Patent Application Laid-Open No. 9-161958. Specifically, a conductive layer formed by printing is provided on a sheet-like substrate (sheet-like) such as a polymer sheet, and an electrode is laminated on the edge of the conductive layer. The lead wire is soldered, and the conductive layer and the electrode are covered with a polymer covering plate. The seat seat electrode is energized by connecting the lead wire to the battery of the automobile, and as a result, the conductive layer is heated.

  Here, when the heating element is an electric blanket, a heater wire is not provided in a portion corresponding to the upper body of a normal electric blanket. However, the electric blanket used as the heating element of the warming device of the present invention is such that the wire heater 50 is also provided at the portion corresponding to the upper body, such as the electric blanket 300 shown in FIG. It is preferable. If the heat storage sheet is not warmed, a feeling of cooling will be given rather, so that the electric blanket 300 as a heating element also has a wire heater 50 in the portion corresponding to the upper body so that the entire water-containing gel of the heat storage sheet is warmed. It is preferable that Alternatively, for the same reason, it is preferable to use a planar heating element in which a wire heater or a conductive layer is provided for most of the portion of the heat storage sheet that faces the hydrogel layer.

In the electric blanket 300 shown in FIG. 3, the area s of the portion formed by being surrounded by the outermost periphery of the wire heater 50 is expressed by the following calculation formula. About 70% of the area t of a plane:
(732 * 1125) / (900 * 1300) * 100 = 70.4.

  The area s is preferably 65 to 95% of the area t.

Alternatively, the area s of the portion formed by being surrounded by the outermost periphery of the wire heater or conductive layer in the planar heating element is the layer of the hydrous gel of the heat storage sheet that is used overlapping the planar heating element. The area g is preferably 60% or more, more preferably 70 to 130%, still more preferably 80 to 120%, and particularly preferably 90 to 110%. Thereby, the whole water-containing gel of the heat storage sheet is warmed by the heating element, and the influence of electromagnetic waves emitted from the heating element is also small. The area s is preferably 0.2 to 1.5 m ² . For example, when the heating element is an electric cushion, the area s is about 0.2 to 0.25 m ² , and one unit of an electric blanket or an electric carpet (a large electric carpet is partially heated, It is preferable that the wire heater is divided into two or more units) instead of a single wire heater in its entirety, and is about 1.2 to 1.5 m ^2. .

  In order to increase thermal efficiency and heat retention performance and contribute to energy saving, the heating element, particularly the planar heating element, preferably has a heat insulating layer. The said heat insulation layer is formed in the side which does not oppose the thermal storage sheet of a heat generating body. Or it is preferable that the heating apparatus of this invention has a heat insulation sheet | seat in addition to a heat generating body and a thermal storage sheet | seat. This heat insulating sheet is used, for example, disposed on the side of the sheet heating element that does not face the heat storage sheet.

  Examples of the heat insulating material for forming the heat insulating layer and the heat insulating sheet include a foamed polyethylene, a foamed polyurethane, a metal foil such as aluminum, silver, copper, or the like, or a metal such as aluminum, silver, copper, etc. deposited thereon. Examples thereof include polyethylene terephthalate sheets and plates. Although the direction of this heat insulating material is not specifically limited, It is preferable to arrange | position so that metal foil and a vapor deposition layer may come to the side which does not oppose a heat generating body. From the viewpoint of durability, a coating layer such as a polymer sheet layer may be provided on the metal foil or the vapor deposition layer.

  Next, the heat storage sheet according to the present invention will be described.

  FIG. 4 is a cross-sectional view showing an example of a heat storage sheet according to the present invention. The heat storage sheet 100 includes a bag body 10 and a hydrated gel 5 enclosed therein. The bag body 10 has flexibility. Here, “having flexibility” means that it can be folded or folded by applying a force, and can be almost restored by opening the folded or opened one. It means having. The bag body 10 has one surface 1 and the other surface 3.

Examples of combinations of materials constituting the surfaces 1 and 3 of the bag body 10 are as follows.
(1) Both surfaces 1 and 3 are water vapor barrier sheet layers;
(2) Surface 1 is a composite layer of a water vapor barrier sheet layer (inside; the side in contact with the hydrogel 5) and a fiber layer (outside), and surface 3 is a water vapor barrier sheet layer;
(3) Each of the surfaces 1 and 3 is a composite layer of a water vapor barrier sheet layer (inner side; the side in contact with the hydrogel 5) and a fiber layer (outer side);
(4) Surface 1 is a composite layer of a fiber layer (inside; the side in contact with water-containing gel 5) and a water vapor barrier sheet layer (outside), and surface 3 is a water vapor barrier sheet layer;
(5) Each of the surfaces 1 and 3 is a composite layer of a fiber layer (inner side; the side in contact with the hydrous gel 5) and a water vapor barrier sheet layer (outer side);
(6) Surface 1 is a composite layer of a fiber layer (inside; the side in contact with water-containing gel 5), a water vapor barrier sheet layer (intermediate), and a fiber layer (outside), and surface 3 is a water vapor barrier sheet layer;
(7) Surface 1 is a composite layer of a fiber layer (inside; the side in contact with water-containing gel 5), a water vapor barrier sheet layer (middle) and a fiber layer (outside), and surface 3 is a fiber layer (inside; water-containing gel 5). A composite layer of the contact side) and the water vapor barrier sheet layer; and (8) each of the surfaces 1 and 3 is a fiber layer (inside; the side in contact with the hydrous gel 5), the water vapor barrier sheet layer (intermediate), and Composite layer of fiber layer (outside).

  When one surface 1 and / or the other surface 3 of the bag body 10 is a composite layer, the layers constituting the composite layer may be bonded or fused to each other over the entire surface, or the outer peripheral portion (the bag body). Or the outer peripheral portion (the edge portion of the bag body 10) may be bonded or fused entirely, and the other portions may be partially bonded or fused. It may be fused.

  In addition, especially when not using a water vapor | steam barrier sheet | seat layer, it is preferable that each layer is mutually adhere | attached or melt | fused over the whole surface. This is because the water vapor transmission rate of the surfaces 1 and 3 can be reduced by an adhesive or by fusing.

  When a fiber layer is used as a material constituting one surface 1 and / or the other surface 3 of the bag body 10, heat conduction to a heated body (for example, human skin) is gentle. Further, when the fiber layer is arranged on the inner side (the side in contact with the water-containing gel 5), the water-containing gel 5 adheres to the fiber layer and is not easily displaced.

The bag body of the heat storage sheet of the present invention preferably has a moisture permeability of 30 g / m ² · 24 hours or less as measured on both sides of the bag according to JIS Z0208 (cup method; 40 ° C .; 90% RH). . In order to realize such moisture permeability, a water vapor barrier sheet layer having a moisture permeability of 30 g / m ² · 24 hours or less in JIS Z0208 (cup method; 40 ° C .; 90% RH) is provided on both sides of the bag. Is preferably arranged. The moisture permeability of each side of the bag or the water vapor barrier sheet layer is preferably 20 g / m ² · 24 hours or less, more preferably 10 g / m ² · 24 hours or less, and 8 g / m still more preferred ² - is 24 hours or less, particularly preferably not more than 5 g ^{/ m} 2 · 24 hours, and most preferably is approximately 0 g ^{/ m} 2 · 24 hours.

  In carrying out JIS Z0208 (cup method), the water vapor barrier sheet has the side facing the water-containing gel as the upper side (the outer side without calcium chloride). Thereby, the volatilization amount of water and / or water vapor from the hydrogel to the outside is specified.

  The thickness of the water vapor barrier sheet layer is not particularly limited as long as it has flexibility suitable for use and exhibits the required strength, but is usually 100 μm or less, preferably 10 to 70 μm, more preferably 20 to 50 μm, particularly Preferably it is 25-45 micrometers.

  When the water vapor barrier sheet layer is composed of a polymer sheet, polyvinylidene chloride resins, linear low density polyethylene, polyesters, polyvinyl chloride that provide a polymer sheet with low moisture permeability as the raw material polymer A polymer sheet is produced by using one or more polymers selected from the group consisting of styrene and polyamides and / or adding a water vapor barrier property-imparting agent to the polymer. Here, the concept of polyvinylidene chloride resins includes not only a vinylidene chloride homopolymer but also a copolymer of vinylidene chloride and other monomers. A copolymer is used. Examples of the water vapor barrier property-imparting agent include fatty acid amide, bis fatty acid amide, paraffin wax, carnauba wax, montan wax, polyethylene wax, petroleum resin, and the like.

  The polymer sheet constituting the water vapor barrier sheet layer may be composed only of a polymer, and may contain various additives including the water vapor barrier property-imparting agent. Examples of various additives include stabilizers such as plasticizers and heat stabilizers, antioxidants, lubricants, dispersion aids, ultraviolet absorbers, and surfactants.

  The polymer sheet constituting the water vapor barrier sheet layer can be produced by a usual method. For example, in the production of a polymer sheet mainly composed of polyvinylidene chloride resin or linear low density polyethylene, a compound containing a polymer and various additives is used to perform melt extrusion molding and uniaxial or biaxial stretching. In addition, regarding the manufacturing method of such a polymer sheet, refer to Unexamined-Japanese-Patent No. 2003-26882, Unexamined-Japanese-Patent No. 2003-192861, and Unexamined-Japanese-Patent No. 2004-202752.

  The water vapor barrier sheet layer is not limited to a single layer, and may have a multilayer structure in which two or more polymer sheets of different materials are fused or bonded. The structure of the water vapor barrier sheet having such a multi-layer structure is not particularly limited as long as it has flexibility and strength with no problem in use. As an example, at least one of the plurality of layers may be one containing, as a main component, a polyvinylidene chloride-based resin exhibiting low moisture permeability or linear low density polyethylene. In this case, examples of the polymer that is the main component of the other layer include polyethylene terephthalate (PET), various polyethylenes, polypropylene, polyamide, and the like that are excellent in strength. In addition, polymers such as polyesters other than PET, polycarbonate, polyimide, polyacetal, polyvinyl alcohol, polystyrene and the like can also be used as the material for the polymer sheet.

  Polyvinylidene chloride-based polymer sheets tend to have poor adhesion to polymer sheets of other materials, so when laminated with polymer sheets of other materials to form a multilayer structure, polyvinylidene chloride It is preferable to corona-treat the surface of the system polymer sheet that faces the other polymer sheet.

The water vapor barrier sheet layer may contain other than the polymer sheet. As an example, there is one in which a polymer sheet and a metal foil are laminated. The water vapor barrier sheet layer including such a metal foil has a moisture permeability (JIS Z0208; cup method; 40 ° C .; 90% RH) of approximately 0 g / m ² · 24 hours. Moreover, as a kind of metal which comprises metal foil, aluminum, gold | metal | money, silver, copper, iron, nickel, palladium, platinum etc. and these alloys are mentioned. The water vapor barrier sheet layer having such a metal foil also exhibits electromagnetic shielding properties. The thickness of the metal foil is not particularly limited, but is preferably about 10 nm to 500 μm. The thickness is selected in consideration of the decrease in flexibility as the metal foil becomes thicker.

  In the water vapor barrier sheet layer in which the polymer sheet and the metal foil are laminated, the metal foil may constitute the outermost layer, but from the viewpoint of adhesion between the water vapor barrier sheet layer and other layers such as a fiber layer. The outermost layer is preferably a polymer sheet, for example, a structure in which the polymer sheets 61 and 63 sandwich the metal foil 65 as shown in FIG.

Another example of the water vapor barrier sheet layer containing a material other than the polymer sheet is a polymer sheet having a metal-based or inorganic deposition layer on at least one of the outer sides. For example, as shown in FIG. 6, a metal or inorganic vapor deposition polymer sheet 70 having a metal or inorganic vapor deposition layer 75 on one surface of a polymer sheet 71. The water vapor barrier sheet layer having such a configuration has a moisture permeability (JIS Z0208; cup method; 40 ° C .; 90% RH) that is substantially close to 0 g / m ² · 24 hours.

  Here, examples of the metal material to be deposited include gold, silver, copper, palladium, platinum, aluminum, nickel, iron, tin and alloys thereof (for example, silver-palladium alloy), and oxides thereof (for example, oxidation). Aluminum, tin oxide, indium tin oxide, antimony tin oxide). Moreover, ceramics, silica, etc. are mentioned as an inorganic substance vapor-deposited. When a metal is vapor-deposited, the water vapor barrier sheet layer also exhibits electromagnetic shielding properties.

  The thickness of the vapor deposition layer is usually about 1 to 100 nm so that the water vapor barrier sheet layer exhibits a desired moisture permeability and the flexibility of the water vapor barrier sheet layer is not significantly reduced. . The method for forming the vapor deposition layer is not limited, and a vacuum vapor deposition method, a sputtering method, an ion plating method, a chemical vapor deposition method, a plasma chemical vapor deposition method, or the like may be applied.

  For example, as the surface 3 of the bag body 10, the metal-based vapor-deposited polymer sheet 70 is used so that the metal-based vapor-deposited layer 75 is disposed on the outside (the side not in contact with the water-containing gel), and the manufactured heat storage sheet is When the heating device of the present invention is configured so that the metal-based vapor deposition layer 75 of the heat storage sheet faces a heating element such as an electric blanket so as to be in contact with each other, electromagnetic waves emitted from the electric blanket are generated. Shields the electromagnetic wave from reaching the human body.

  In the present specification, the term “polymer sheet” is used to include not only “polymer sheet” but also “polymer film”.

  The fiber layer used for the bag body of the heat storage sheet of the present invention is composed of, for example, one or more selected from the group consisting of nonwoven fabric, woven fabric, knitted fabric, and paper. When these fiber layers are used for the outermost layer of the bag body, it is preferable that an antifungal agent is attached.

When the fiber layer is made of nonwoven fabric, the material is, for example, rayon, nylon, polyester, acrylic, polypropylene, vinylon, polyethylene, urethane, cotton, cellulose, etc., and the thickness is usually 20 g / m ^{2 to} 150 g / m ² , preferably 30 g / m ^{2 to} 100 g / m ² , more preferably 40 g / m ^{2 to} 70 g / m ² . Moreover, as a kind of nonwoven fabric, although a melt blown nonwoven fabric, a spun bond nonwoven fabric, a span needle nonwoven fabric, a spunlace nonwoven fabric, etc. are mentioned, all can be used in this invention.

  Regarding the nonwoven fabric that comes into contact with the hydrogel layer, that is, the nonwoven fabric disposed inside the polymer sheet layer such as the water vapor barrier sheet layer, the material is preferably rayon, nylon, polyester or cotton, and polyester is particularly preferred. Moreover, as a kind of nonwoven fabric, a spunlace nonwoven fabric, a spun needle nonwoven fabric, or a spunbond nonwoven fabric is preferable, and a spunlace nonwoven fabric is particularly preferable.

When the fiber layer is made of woven fabric, the material is, for example, cotton, rayon, polyester, polypropylene, nylon, acrylic, etc., and its thickness is usually 50 g / m ^{2 to} 150 g / m ² , preferably 60 g / m ^{2 to} 120 g / m ² , more preferably 70 g / m ^{2 to} 100 g / m ² . When the fiber layer is made of knitted fabric, the material is, for example, rayon, polyester, polypropylene, nylon, acrylic, etc., and the thickness is usually 80 g / m ^{2 to} 200 g / m ² , preferably 100 g / m. ^{2 to} 180 g / m ² , more preferably 120 g / m ^{2 to} 150 g / m ² .

Antifungal agents used in the fiber layer used for the outermost layer of the bag body are triazole antifungal agents, pyrithione antifungal agents, benzimidazole antifungal agents, benzthiazole antifungal agents, isothiazoline antifungal agents One or more selected from the group consisting of an agent and a thiabendazole antifungal agent is preferable, and the antifungal agent is preferably attached to at least both surfaces of the fiber layer, and the amount used is 0. It is preferably 1 to 40 g / m ² .

  Examples of triazole antifungal agents include 2- (4-chlorophenyl) -3-cyclopropyl-1- (1H-1,2,4-triazol-yl) -butan-2-ol, carboxybenzotriazole, { 1- (4-chlorophenoxy) -3,3-dimethyl-1- (1,2,4-triazol) -1-yl} butan-2-one and the like. Examples of pyrithione antifungal agents include 2-pyridinethiol-1-oxide sodium salt and zinc salt. Examples of benzimidazole antifungal agents include 2- (4-thiazolyl) benzimidazole, 2- (carbomethoxyamino) benzimidazole, methyl 2-benzimidazolecarbamate, 1-butylcarbamoyl-2-benzimidazolecarbamic acid Methyl, methyl 6-benzoyl-2-benzimidazolecarbamate, methyl 6- (2-thiophenecarbonyl) -2-benzimidazolecarbamate, 2-thiocyanomethylthiobenzimidazole, 1-dimethylaminosulfonyl-2-cyano-4 -Bromo-6-trifluoromethylbenzimidazole, 2- (2-chlorophenyl) benzimidazole, 2- (1- (3,5-dimethylpyrazolyl) benzimidazole, 2- (2-furyl) benzimidazole, perben Tetrazole, 5,6-dichloro-1-phenoxycarbonyl-2-trifluoromethyl benzimidazole, 4,5,6,7 is tetrachloro-2-trifluoromethyl benzimidazole.

  Examples of benzthiazole antifungal agents include 2- (4-thiocyanomethylthio) benzthiazole, sodium salt of 2-mercaptobenzthiazole, zinc salt of 2-mercaptobenzthiazole, 2- (thiocyanomethylsulfonyl) benz There are thiazole and the like. Examples of isothiazoline antifungal agents include 2- (n-octyl) -4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, 5-chloro-2-methyl-4-isothiazoline-3- ON, 2-methyl-4-isothiazolin-3-one, 4,5-dichloro-2-cyclohexyl-4-isothiazolin-3-one, and the like. Examples of thiabendazole antifungal agents include thiabendazole.

  All of the above antifungal agents have a feature that there is little irritation to the skin. Among the above, at least one antifungal agent selected from the group consisting of triazole antifungal agents, pyrithione antifungal agents, benzthiazole antifungal agents, isothiazoline antifungal agents, and thiabendazole antifungal agents It is preferable to use one or more antifungal agents including a triazole type antifungal agent.

  The antifungal agent “attached to at least both surfaces of the fiber layer” means that when the antifungal agent is applied to the woven or non-woven fabric constituting the fiber layer by printing or coating, for example, It means that an antifungal agent is present on both the front and back surfaces of the nonwoven fabric. Therefore, the concept of “at least both sides” includes the case where the anti-mold agent is present in the entire fiber layer, for example, when the cloth is dipped in a liquid containing the anti-mold agent and dried.

The amount of the antifungal agent is 0.1 to 40 g / m ² , preferably 1 to 40 g / m ² , more preferably 2 to 20 g / m ² , and even more preferably 4 to 10 g / m 2. ² and most preferably 6 to 8 g / m ² .

  The method of attaching the antifungal agent to the woven or non-woven fabric that is the fiber layer is not particularly limited. For example, a method of dipping a woven fabric in a solution containing an antifungal agent (which may contain a binder), squeezing and drying to disperse the solvent, and (2) an antifungal agent and a binder. (3) Application of liquid containing antifungal agent and binder, (4) Woven cloth containing antifungal agent (may contain binder), etc. There are methods such as spraying and drying to dry the solvent. As will be described later, when the binder is a monomer, in each of the above methods, a heating step is added as a drying step or as a separate step to polymerize the monomer. Moreover, you may use a pigment together in the case of adhesion | attachment of an antifungal agent.

  In order to reliably fix the antifungal agent to the fiber layer, it is preferable to use a liquid containing an antifungal agent and a binder. Here, the substance used as the binder is a water-soluble or water-insoluble monomer, polymer, or resin. For example, when the antifungal agent is water-soluble, an aqueous solution thereof is prepared. At this time, a water-soluble or water-dispersible monomer, polymer or resin is also used. In addition, when the antifungal agent is water-insoluble, an organic solvent such as an alcohol that can disperse the antifungal agent in water or dissolve the antifungal agent is used. Also used.

  Examples of the water-soluble or water-dispersible polymers and resins include polyvinyl alcohol, cellulose compounds (specifically, natural cellulose, sulfated, phosphorylated, nitrated, carboxymethylated, carboxypropylated, hydroxy And those having a chemical treatment such as ethylation) and starch compounds (specifically, phosphate esterified starch, etherified starch, carboxymethylated starch, hydroxyethylated starch, etc.). Examples of the polymer or resin dissolved or dispersed in the organic solvent include a urethane polymer compound, a styrene-butadiene polymer compound, and an acrylic polymer compound.

  The use of a monomer that becomes a polymer compound by self-crosslinking is preferred. An antifungal agent is added to a solution or emulsion containing such a monomer, and the resulting solution or emulsion is applied to the fiber layer and then heated to cause polymerization of the monomer. This is because the polymer compound obtained from such a monomer is strongly bonded to the fiber layer, and as a result, the antifungal agent is properly adhered to the fiber layer, thereby increasing the durability of the antifungal agent. Those suitable for solution polymerization include those containing an acrylic monomer and a polymerization initiator, and those suitable for emulsion polymerization include solvent- and abrasion-resistant acrylic emulsions, highly weather-resistant acrylic silicon emulsions, colloids. Known are stable fine particle acrylic silicon emulsion, room temperature one-pack crosslinkable acrylic emulsion, alkali-curing cationic fine particle acrylic silicon, hybrid acrylic epoxy emulsion, and the like.

  The concentration of the antifungal agent in the solution or dispersion containing the antifungal agent and the binder is preferably 0.1 to 50% by weight, more preferably 1 to 40% by weight, still more preferably 2 to 30% by weight. is there. The concentration of the binder is preferably 2 to 30% by weight, more preferably 4 to 20% by weight, and even more preferably 6 to 15% by weight.

  For example, in the heat storage sheet 100 shown in FIG. 4, when one surface 1 and / or the other surface 3 of the bag body 10 is composed of a polymer sheet and a nonwoven fabric, the surface of the polymer sheet that contacts the nonwoven fabric is corona. Preferably it has been treated. Moreover, it is preferable that the polymer sheet and the nonwoven fabric are bonded by a dry lamination method, a hot melt bonding method, or an extrusion sandwich lamination method. With such a configuration, the polymer sheet and the nonwoven fabric are properly bonded without being peeled off. In dry lamination, an adhesive dissolved in an organic solvent or a water emulsion type adhesive is applied to a polymer sheet, the solvent is evaporated with hot air, and then a nonwoven fabric is laminated.

  Of the layers constituting the surfaces 1 and 3 of the bag 10, the outer peripheral portion of the two layers that are in contact with the hydrogel 5, i.e., the four circumferences, may be processed so that the hydrogel 5 is not exposed. It may be bonded with an adhesive or may be fused by heat or the like.

  The hydrogel 5 is a gel formed by a polymer or resin that absorbs water in a smooth and large amount. Examples of the polymer constituting the hydrogel include polyacrylic acids, vinyl polymers, urethane polymers, agarose, lactose, collagen, mannose and the like. The hydrogel is preferably a polymer gel. “Polymer gel” is a polymer that forms a three-dimensional network structure by crosslinking and absorbs a solvent (mainly water in the case of a hydrogel) to swell.

  The polymer gel is formed by crosslinking monomers and polymers with a crosslinking agent in the presence of water and other components. Examples of the monomer used for the formation of the polymer gel include a vinyl monomer, which is a reaction initiator using a divinyl compound (for example, N, N′-methylenebisacrylamide or ethylene glycol dimethacrylate) as a crosslinking agent. In the presence of (for example, azobisisobutyronitrile, benzoyl peroxide, persulfate), a reaction accelerator (for example, tetramethylethylenediamine) is added as necessary to form a network structure. Examples of the monomer / polymer used for forming the polymer gel include acrylic acids / polyacrylic acids. Examples of polyacrylic acids include polyacrylic acid, polyacrylic acid salts, partially neutralized polyacrylic acid (a copolymer of acrylic acid and acrylate), polymethacrylic acid, polymethacrylic acid salt, and methacrylic acid. An acid partial neutralized product (a copolymer of methacrylic acid and methacrylic acid salt) can be mentioned. Specific examples of the salt include sodium salt, potassium salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, ammonium salt and the like. The amount of the polyacrylic acid is preferably 1 to 10% by weight, more preferably 3 to 8% by weight, based on the total amount of the hydrogel composition. In addition, since polyacrylic acid is a highly water-absorbing polymer compound, it can be used without crosslinking.

  In the present invention, a hydrogel is preferably formed with a crosslinked product of polyacrylic acid and water. Examples of the crosslinking agent include polyvalent metals. The polyvalent metals include polyvalent metals, salts thereof and polyvalent metal compounds. Any of these polyvalent metals can be used as long as it is divalent or more and can crosslink polyacrylic acids and the like.

  Examples of the polyvalent metals include polyvalent metals such as magnesium, calcium, zinc, cadmium, aluminum, titanium, manganese, cobalt, nickel, salts thereof, and compounds thereof. From the viewpoints of safety, productivity, and gel properties, aluminum, magnesium, calcium, or a polyvalent metal compound containing them is preferable, and an aluminum compound is particularly preferable.

  Examples of aluminum compounds include hydroxides such as aluminum hydroxide gel and aluminum magnesium hydroxide; inorganic or organic acids such as aluminum chloride, aluminum sulfate, dihydroxyaluminum aminoacetate, kaolin, and aluminum stearate. Ortho salts or basic salts thereof; double salts such as aluminum alum; and aluminates such as sodium aluminate, inorganic aluminum complex salts and organic aluminum chelate compounds; synthetic hydrotalcite, magnesium aluminate metasilicate, Examples thereof include aluminum nitrate, aluminum sulfate, EDTA-aluminum, aluminum allantoinate, aluminum acetate, and aluminum glycinal. The amount of the polyvalent metal is preferably 0.01 to 2.0% by weight, more preferably 0.01 to 0.5% by weight, still more preferably 0.02 to 0% in the total amount of the hydrogel composition. 0.5 wt%, particularly preferably 0.06 to 0.2 wt%.

  It is necessary to control the crosslinking (that is, delay to some extent) when a hydrogel layer is produced by plastering and a rapid-acting crosslinking agent such as magnesium aluminate metasilicate is used. Therefore, a crosslinking retarder of edetic acids such as EDTA-2Na is also used. The amount of the crosslinking retarder is preferably 0.02 to 0.5% by weight, more preferably 0.02 to 0.2% by weight, still more preferably 0.03 to 0. 0% by weight based on the total amount of the hydrogel composition. 1% by weight.

  In addition to water, the gelling polymer (preferably polyacrylic acid) and the crosslinking agent, polyhydric alcohols such as glycerin and propylene glycol, and polymers other than polyacrylic acid are used for forming the hydrous gel. Also good. By blending such other polymers, the stability of the gel is improved.

  Polymers other than polyacrylic acids include cellulose derivatives, starch derivatives, and vinyl polymers. Specifically, cellulose derivatives such as carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxymethyl ethyl cellulose, hydroxypropyl cellulose, hydroxypropyl cellulose phthalate methyl cellulose, cellulose acetate, cellulose acetate hydroxymethyl ethyl cellulose, methyl cellulose, ethyl cellulose or alkali metal salts thereof Starch derivatives such as carboxymethyl starch and hydroxypropyl starch; polyvinyl alkyl ether, polyvinyl alcohol, polyvinyl acetate, methyl vinyl ether / maleic anhydride copolymer, polyvinyl pyrrolidone, carboxyl vinyl polymer, vinyl pyrrolidone / vinyl alkylamino amino acid Copolymer, styrene Nmarein acid copolymer, ethylene - vinyl acetate copolymer, vinyl acetate - and vinyl polymers such as polyvinyl alcohol copolymer. Among these, a cellulose derivative is preferable, and carboxymethyl cellulose or an alkali metal salt thereof is more preferable. The amount of the polymer other than polyacrylic acids such as cellulose derivatives is preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight, based on the total amount of the hydrogel composition. The amount of the polyhydric alcohol is preferably 6 to 25% by weight, more preferably 8 to 22% by weight, based on the total amount of the hydrogel composition.

  The hydrogel may contain a substance having electromagnetic wave shielding properties. Examples of substances having electromagnetic shielding properties include ferrite, germanium, carbon black, charcoal, tin oxide, antimony tin oxide, indium tin oxide, gold, silver, copper, aluminum, iron, nickel, palladium, platinum, and the like. . As the substance having electromagnetic wave shielding properties, a substance having a particle size, thickness, shape, and length that does not adversely affect the properties of the hydrogel is used in an amount that does not adversely affect the properties of the hydrogel. The amount is preferably 2 to 10% by weight, more preferably 3 to 8% by weight, based on the total amount of the hydrogel.

  For the formation of hydrous gel, in addition to the above components, preservatives, antifungal agents, preservatives, stabilizers, colorants, pH adjusters, shape-preserving agents, thickeners, as long as the physical properties are not affected. Etc. may be used.

  In forming the hydrous gel, oils and fats that are liquid at room temperature may be used together with the surfactant. Use of fats and oils improves the electrical conductivity of the hydrogel and warms the hydrogel in a short time.

  Examples of oils and fats that are liquid at room temperature include various vegetable oils such as olive oil, sesame oil, safflower oil, soybean oil, corn oil, rapeseed oil, and cottonseed oil. The amount of fat is preferably 3 to 15% by weight, more preferably 5 to 10% by weight, based on the total amount of the hydrogel.

  A nonionic surfactant is suitable as the surfactant for dispersing the fats and oils in the hydrogel. Examples of nonionic surfactants include ether type nonionic surfactants such as polyoxyethylene alkyl ether and polyoxyethylene alkyl aryl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester and the like. There are ester type nonionic surfactants such as ether ester type nonionic surfactants and sorbitan fatty acid esters. In the present invention, it is preferable to use an ether type nonionic surfactant. The amount of the nonionic surfactant is preferably 0.5 to 5% by weight, more preferably 1 to 4% by weight, based on the amount of fats and oils.

  The water content of the hydrogel is preferably 10 to 99.9% by weight based on the total weight of the hydrogel. Here, when the hydrated gel does not contain the fats and oils, the water content is more preferably 20 to 99% by weight, still more preferably 30 to 98% by weight, and 40 to 97% by weight. Particularly preferred is 50 to 95% by weight. On the other hand, when the fats and oils are contained, the water content is more preferably 20 to 95% by weight, still more preferably 30 to 90% by weight, and 40 to 85% by weight. Particularly preferred is 50 to 75% by weight. In addition to water, the amount of polyhydric alcohol is also affected by the presence or absence of the oil. The amount of the polyhydric alcohol is about 6 to 12% by weight when the hydrated gel does not contain the oil or fat, based on the total weight of the hydrated gel, but 15% when the hydrated gel contains the oil or fat. Or about 25% by weight.

  In the heat storage sheet according to the present invention, the hydrogel is stored in the bag and is not exposed. In addition, the hydrogel may be divided into two or more. In other words, there may be a portion where both sides of the bag body are bonded between the plurality of hydrogel layers. When there are a plurality of hydrogel layers, the ratio of the area s of the portion surrounded by the wire heater of the planar heating element to the area g of the hydrogel layer is calculated for each hydrogel layer.

In the present invention, the hardness and elasticity of the hydrogel are not particularly specified. However, especially when the heating element is an electric blanket or seat sheet, it is preferred that the hydrogel has a jelly strength of 10 to 3,000 g as measured under the following conditions:
(Jelly strength measurement conditions)
Measuring device: Compression type physical property measuring device Measuring atmosphere condition: 20 ° C., 65% RH
Compressed shape and area: 30 mm diameter circle, 7.065 cm ²
Compression amount (displacement amount): 2 mm
Compression speed: 1 mm / sec. Size of measurement sample: 5 cm × 5 cm × 6 mm (thickness).

  The jelly strength of 10 to 3,000 g is, for example, when the hydrated gel contains a cross-linked product of polyacrylic acids, and the amount of polyacrylic acids based on the total amount of the hydrated gel preparation composition. Is 1 to 10% by weight, the amount of crosslinking agent is 0.01 to 0.5% by weight, the amount of crosslinking retarder is 0.02 to 0.2% by weight, and the amount of water is 50 to This is accomplished by preparing from a composition that is 95% by weight. In this case, the jelly strength is more preferably 200 to 3,000 g, still more preferably 500 to 2,000 g, and particularly preferably 800 to 1,500 g.

  Especially when the heating element is an electric carpet or an electric cushion, it is preferable that the hydrogel has a jelly strength of 400 to 5,000 g as measured under the above conditions.

  The jelly strength of 400 to 5,000 g is, for example, when the hydrated gel contains a cross-linked product of polyacrylic acids, and the amount of polyacrylic acids based on the total amount of the hydrated gel preparation composition. Is 3 to 8% by weight, the amount of crosslinking agent is 0.06 to 2.0% by weight, the amount of crosslinking retarder is 0.02 to 0.5% by weight, and the amount of water is 50 to This is accomplished by preparing from a composition that is 95% by weight. In this case, the jelly strength is more preferably 500 to 5,000 g, still more preferably 700 to 4,000 g, and particularly preferably 1,000 to 3,500 g.

  The outline of the jelly strength measurement of the hydrogel is as shown in FIG. That is, the adapter (the shape and size of the pressing portion: a circle having a diameter of 30 mm) 41 is displaced by 2 mm at a compression speed of 1 mm / second on the gel sample 43 placed on the sample mount 45. Press and measure the load at that time.

  The jelly strength of the hydrous gel increases with the progress of cross-linking of the polymer after the gel is formed, and becomes a stable numerical value after a certain period of time. Therefore, the numerical value of the jelly strength is a numerical value that should be satisfied at least when the consumer uses the product according to the present invention (usually after the lapse of 5 days or more from the manufacture).

  When the hydrogel in the present invention contains a cross-linked product of polyacrylic acids, the polymer is cross-linked, so that it has excellent shape retention and has the above jelly strength and low resilience. Showing gender.

  The jelly strength measurement method is defined in JIS K6503-1996 for glue and gelatin, but the measurement conditions are different from the method employed in the present invention.

The weight of the hydrogel is preferably 0.5 to 15 kg / m ² , more preferably 1 to 15 kg / m ² , still more preferably 2 to 10 kg / m ² , and 3 to 6 kg. / M ² is particularly preferred.

  The heat storage sheet of the present invention may further include an adhesive layer outside the surface 1 or 3. The adhesive layer may be adhered to the heating element.

  Examples of the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer mainly include a rubber-based pressure-sensitive adhesive composition, an acrylic pressure-sensitive adhesive composition, and other thermoplastic resins (for example, polyamide-based, polyethylene-based, and cellulose-based resins). Examples thereof include an adhesive composition as a component.

  Examples of the pressure-sensitive adhesive used in the rubber-based pressure-sensitive adhesive composition include diene polymer compounds, specifically, natural rubber, synthetic rubber, or a mixture thereof. Synthetic rubbers include styrene-isoprene block copolymer rubber, styrene-isoprene-styrene block copolymer rubber, styrene-isobutylene-styrene block copolymer rubber, styrene-butadiene rubber, polyisoprene rubber, butyl rubber, chloroprene. Examples thereof include rubber, nitrile rubber, polysulfide rubber, and silicone rubber.

  As the pressure-sensitive adhesive used in the acrylic pressure-sensitive adhesive composition, conventionally used n-butyl (meth) acrylate, hexyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate , One or more (meth) acrylic esters such as tridecyl (meth) acrylate, and (meth) acrylic acid, maleic acid, maleic anhydride, hydroxyethyl acrylate, hydroxypropyl acrylate, copolymerizable with the ester , Acrylamide, dimethylacrylamide, aminoethyl methacrylate, functional monomers such as methacrylic acid (meth) acrylate, or copolymers with vinyl monomers such as acrylonitrile, vinyl acetate, and vinyl propionate.

  The property of the pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer is not particularly limited as long as it can be easily applied to the surface to be coated, such as an emulsion, a solvent solution, an aqueous solution, or a hot-melt type. .

  The thickness of the pressure-sensitive adhesive layer constituted by the pressure-sensitive adhesive composition is usually 10 to 70 μm, preferably 20 to 40 μm.

  When the heating element is an electric carpet, an electric cushion, an electric bed blanket, a seat sheet, or the like, the heat storage sheet of the present invention is imitated on the outside of the surface 1 or 3 and further on plant materials and / or plant materials. It may have a layer of polymeric material knitted fabric.

  Here, “a knitted fabric made of a plant material and / or a polymer material imitating a plant material” means, for example, a tatami mat (woven fabric with weeds as weft), cocoon (woven fabric with weeds as weft), rattan tail, rattan rather Rattan knitted fabrics such as reeds, reed knitted fabrics such as reeds (also referred to as cocoons), thin knitted fabrics of bamboo and wood (for example, cherry blossoms and reeds), and the like. The tatami mats are not limited to those with 100% weft weeds, but synthetic tatami mats (tatami mats knitted with polymer stems resembling weeds) and some weeds were replaced with polymer stems. It may be a thing. A typical example of the polymer used for the production of the synthetic tatami mat is polypropylene.

  It is preferable that a knitted fabric of a polymer material imitating a plant material such as a tatami mat or a plant material is bonded to a polymer sheet constituting a bag using an adhesive. Examples of the pressure-sensitive adhesive include known pressure-sensitive adhesives such as various rubbers including natural rubber, (meth) acrylic acid ester (co) polymer systems, and silicones. In addition, as a method for applying the pressure-sensitive adhesive, a suitable method is selected according to the form of the pressure-sensitive adhesive to be used (solvent type, emulsion type, heat spread type, irradiation solventless type, aqueous solution type).

  A knitted fabric of a polymer material imitating a plant material such as a tatami surface or a plant material and a polymer sheet may be joined by sewing. That is, not only those outer peripheral parts but also the inside is sewn, for example, vertically and horizontally at an appropriate interval to join them together. In addition, this sewing may join the constituent materials of the bag body such as the knitted fabric and the polymer sheet, or may join all the constituent elements of the heat storage sheet including the hydrous gel layer. Good.

  Next, the manufacturing method of the heat storage sheet of this invention is demonstrated. In the heat storage sheet 100 shown in FIG. 4, one surface 1 of the bag body 10 is a composite layer of a water vapor barrier sheet layer (inside; the side in contact with the water-containing gel 5) and a fiber layer (outside). When the surface 3 is a water vapor barrier sheet layer, the heat storage sheet 100 is manufactured, for example, as follows.

  A non-woven fabric to be a fiber layer and a water vapor barrier polymer sheet having a corona treatment on the surface facing the non-woven fabric, preferably using an adhesive or by heat fusion, preferably a dry lamination method Alternatively, the composite x is manufactured by adhering over the entire surface or partially by a hot-melt adhesion method.

  Here, examples of dry lamination adhesives include polyester-based and acrylic copolymer-based adhesives.

  A hydrogel composition is prepared by a conventional method. The prepared composition for a water-containing gel layer is spread on a water vapor barrier polymer sheet to be the other surface 3 to form a water-containing gel layer having a desired thickness. At this time, when the heat storage sheet 100 is a four-round portion or the polymer sheet is a long object, at least both sides thereof do not form a hydrogel layer.

  The surface of the spread composition for a hydrogel layer is coated with the composite x almost simultaneously with the plaster. At this time, the surface of the polymer sheet is directed to the gel.

  The four circumferences of the heat storage sheet 100 are closed by means such as adhesion, fusion, and sewing so that the hydrogel is not exposed from the bag 10. At this time, winding sewing or the like may be performed so that the cut surface on the outer periphery is not exposed.

  When one side 1 and the other side 3 of the bag 10 are both composite layers of a water vapor barrier sheet layer (inside; the side in contact with the hydrous gel 5) and a fiber layer (outside), Except for preparing two composites x and forming a hydrous gel layer on the surface of the water vapor barrier polymer sheet of one composite x, one surface 1 of the bag 10 has a water vapor barrier sheet layer ( It is the same as the case where it is a composite layer of the inner side; the side in contact with the hydrogel 5) and the fiber layer (outer side), and the other surface 3 is a water vapor barrier sheet layer.

  When producing the heat storage sheet 100 using the composite layer of the fiber layer (inside; the side in contact with the hydrogel 5), the water vapor barrier sheet layer (intermediate) and the fiber layer (outside) as the surfaces 1, 3, A nonwoven fabric to be a fiber layer (inner side), a polymer sheet to be a water vapor barrier sheet layer, and a woven fabric to be a fiber layer (outer side), using an adhesive or by thermal fusion, over the entire surface or part Are bonded together to produce a composite z. Two composites z are prepared. In producing the composite z, it is preferable that the polymer sheet is subjected to corona treatment on both sides. Further, it is preferable to employ a dry lamination method, a hot melt adhesion method or an extrusion sandwich lamination method as an adhesion method.

  The composition for hydrogel layer is spread on the nonwoven fabric (on the inside) of one composite w to form a layer of hydrogel 5 having a desired thickness. At this time, when the heat-recovery sheet 100 is a four-round portion or the composite w is a long object, at least both sides thereof do not form a hydrogel layer.

  The surface of the spread composition for a water-containing gel layer is coated with the other composite z almost simultaneously with the spread. At this time, the surface of the nonwoven fabric faces the gel. Next, the four sides of the heat storage sheet 100 are closed by means such as adhesion, fusion, and sewing. At this time, winding sewing or the like may be performed so that the cut surface on the outer periphery is not exposed.

  In the production of the heat storage sheet according to the present invention, the layer of the hydrogel 5 can be produced by pouring instead of using the plaster of the composition for the hydrogel layer. For example, when one side 1 and the other side 3 of the bag body 10 are both composite layers of a water vapor barrier sheet layer (inside; the side in contact with the hydrous gel 5) and a fiber layer (outside). It can also be manufactured as follows.

  The two composites x (long objects) are arranged so that the polymer sheets face each other, and the width direction is heat-sealed or bonded. Next, both sides of these long objects are heat-sealed or bonded to form a bag-like portion. The composition for a hydrogel layer is poured into the bag-shaped portion, and is formed into a sheet by pressing, and the width direction of the long object is heat-sealed or bonded. A heat-sealable sheet is obtained by cutting at approximately the center in the length direction of the heat seal or adhesive portion (to be formed later) formed in the width direction. Hereinafter, the heat storage sheet is continuously manufactured in the same manner.

  Hereinafter, the present invention will be described specifically by way of examples.

Example 1 Production of Thermal Storage Sheet A thermal storage sheet was produced as follows, and the jelly strength of the hydrated gel was measured.

(A) Material constituting each layer [one side of the bag]
(Fiber layer a) Spunlace nonwoven fabric made of polyester; Basis weight: 45 g / m ²
(Water vapor barrier sheet layer a) Linear low density polyethylene-based sheet; Thickness: 40 μm; Water vapor transmission rate (JIS Z0208; Cup method; 40 ° C .; 90% RH): 6.8 g / m ² · 24 hours [hydrous gel Layer] Prepared using the composition of the formulation shown in Table 1; Thickness: 6 mm
[The other side of the bag]
(Water vapor barrier sheet layer b) Linear low-density polyethylene sheet; Thickness: 40 μm; Moisture permeability (JIS Z0208; cup method; 40 ° C .; 90% RH): 6.8 g / m ² · 24 hours (fiber layer) b) Spunlaced nonwoven fabric made of polyester; Basis weight: 45 g / m ²

  The entire surface of the polyester spunlace nonwoven fabric (fiber layer a or b) and the linear low-density polyethylene sheet (water vapor barrier sheet layer a or b) are bonded together with a polyester-based dry lamination adhesive. It was.

(B) Preparation of composition for hydrous gel Here, the outline of the manufacturing method of the composition for hydrogel used for manufacture of the sheet | seat for cooling or heating of this invention is described. The prescription is as shown in Table 1.

(1) First, sodium carboxymethylcellulose is dissolved in a part of D (glycerin). To this, tartaric acid and almost the entire amount of E (water) are added to form a solution.
(2) A mixture of B is prepared and added to the solution prepared in (1).
(3) C is added to the remainder of D (glycerin) to prepare a solution.
(4) Add the solution prepared in (3) to the solution prepared in (2) and stir, and if necessary (if the total amount is less than the design amount due to volatilization of moisture, etc.) Add water to balance.

(C) Manufacturing method (i) Spunlace nonwoven fabric made of polyester (fiber layer b) and linear low density polyethylene sheet (water vapor barrier sheet layer b) are bonded to each other, and the base low linear polyethylene system On the sheet, each of the compositions (Invention Examples 1 to 6) having the formulation shown in Table 1 was spread so that the thickness was 6 mm.

  (Ii) The linear low density of the overlapping base material obtained by laminating the polyester spunlace nonwoven fabric (fiber layer a) and the linear low density polyethylene sheet (water vapor barrier sheet layer a) almost simultaneously with the plaster. The surface of the polyethylene sheet was directed to the gel, the gel surface was covered with the overlap base material, and four rounds were sewn.

(Iii) The cooling or heating sheet sample (20 cm × 30 cm × 6 mm) produced in this way is allowed to stand in a constant temperature room at 40 ° C. for 2 days to promote crosslinking of the polymer in the hydrogel layer. It was left in a constant temperature room at ℃.

(D) Measurement of jelly strength On the 14th and 30th days after the plastering, the overlap base material was peeled off, and a simple physical property measuring instrument Rhetex SD-700DP manufactured by Sun Chemical Co., Ltd. was used. Then, the jelly strength of the gel was measured. The outline of the measurement is as shown in FIG. That is, the adapter 41 was pressed against the gel sample 43 placed on the sample mount 45, and the load at that time was measured.

  The measurement was performed on three gel samples for each of Invention Examples 1 to 6. The results (minimum value, maximum value, and average value) are shown in Table 2.

(Measurement condition)
Measurement atmosphere conditions: 20 ° C., 65% RH
Compressed shape and area: 30 mm diameter circle, 7.065 cm ²
Compression amount (displacement amount): 2 mm
Compression speed: 1mm / sec

Example 2 Test of relationship between moisture permeability of material used for bag of heat storage sheet and moisture retention in water-containing gel (a) Structure and moisture permeability of material used for bag body Polyvinylidene chloride sheet (thickness) 25 μm), a linear low density polyethylene sheet (thickness: 40 μm), a sheet having a multilayer structure in which an aluminum foil (thickness: 7 μm) is sandwiched between two linear low density polyethylene sheets (total Thickness: 41 μm), Reiko Fine Barrier (registered trademark) KW (polyester-based water vapor barrier film; thickness: 40 μm), Toppan Printing Co., Ltd. GX film (ceramic vapor-deposited on PET film; thickness : 40 μm). About these, the water vapor transmission rate in the temperature of 40 degreeC was measured according to JISZ0208. In addition, regarding the GX film, the orientation of the sheet when measuring the moisture permeability was such that the vapor deposition surface was on the outside. The results are shown in Table 3.

(B) Production of heat storage sheet and measurement of moisture reduction rate in hydrous gel by high-temperature storage On the various materials (104 cm × 104 cm) used in (a), the formulation of Invention Example 2 shown in Table 1 6 kg of the composition was plastered leaving a circumference of about 2 cm. Almost simultaneously with the plaster, the gel surface was coated with the same material, and the four circumferences where the composition was not spread were adhered with an adhesive.

  Each product thus manufactured was weighed and then left in a constant temperature room at 40 ° C. for one week. It removed from the temperature-controlled room and measured the weight of each. In addition, before manufacture of a thermal storage sheet | seat, the weight of the various materials used as a bag body constituent material and the weight of the adhesive agent were also measured.

  The weight decreased by standing for one week was determined, and the value was divided by the weight of the water-containing gel before the test to determine the weight reduction rate (%) of the water-containing gel. In this experiment, all the reduced weights were attributed to volatilization of moisture in the gel. The results are shown in Table 3.

Example 3 Measurement of electric field shielding performance The shielding performance of the electric field emitted from the electric blanket by the heat storage sheet according to the present invention was measured. As test materials, only an electric blanket (control), a quilt bed pad (comparison), a sheet obtained by removing the hydrous gel layer from the heat storage sheet according to the present invention (blank), the heat storage sheet I according to the present invention, and the present invention A heat storage sheet II was used.

The blank is made by dry laminating a cotton fabric (outside), a linear low density polyethylene sheet (thickness: 40 μm) and a polyester nonwoven fabric (basis weight: 45 g / m ² ) in this order, and the back side is Polyester / cotton (65/35) blended fabric (outside), linear low-density polyethylene sheet (thickness: 40 μm) and polyester nonwoven fabric (basis weight: 45 g / m ² ) in this order are dry-laminated, and the surface And the outer peripheral part of the back was bonded. This is the same as the configuration of portions other than the water-containing gel of the heat storage sheets I and II according to the present invention.

Moreover, the formulation of the water-containing gels of the heat storage sheets I and II according to the present invention is as shown in Table 4. The amount of the hydrogel was about 6 kg / m ² .

Here, the outline of the manufacturing method of the water-containing gel of the heat storage sheet II according to the present invention will be described. In addition, the manufacturing method of the water-containing gel of the heat storage sheet I is the same as the method of manufacturing the water-containing gel of the heat storage sheet II except that the C group and E group raw materials are not used.
(1) First, sodium carboxymethylcellulose is dissolved in a part of F (glycerin). To this is added tartaric acid and almost the entire amount of G (water) to form a solution.
(2) A mixture of B is prepared and added to the solution prepared in (1).
(3) Add the mixture of C to the solution prepared in (2).
(4) Add the mixture of E to the dispersion prepared in (3).
(5) D is added to the rest of F (glycerin) to prepare a solution.
(6) Add the solution prepared in (5) to the dispersion prepared in (4) and stir until the whole becomes uniform.
(7) On the surface of the non-woven fabric of the three-layer composite that will be the back surface, spread the dispersion prepared in (6), and then apply the gel surface to the surface of the non-woven fabric of the three-layer composite that will be the surface Use and cover up.
(8) After the outer peripheral portion is bonded with an adhesive, it is left until the polymer is crosslinked.

  The electric field was measured as follows. As shown in FIG. 8, a commercially available electric blanket 83 was laid on a mattress 81, and a test material 85 was laid thereon. A measuring device 87 was placed in the center of the test material 85, and the measuring device 87 and the test material 85 were covered with a simple shield box 89 whose inner surface was covered with copper tape and aluminum foil. Note that a weight of about 1.8 kg was placed on the simple shield box 89 in order to ensure that the simple shield box 89 and the test material 85 are in close contact with each other. In addition, the simple shield box 89 was used while being grounded.

  The measuring device 87 is an analog type trifield meter, the measurement frequency range is 30 Hz to 100 kHz, the electric field measurement range is 1 to 1000 V / m, and the magnetic field measurement range is 0 to 100 mG.

  During the measurement, the heater of the electric blanket was turned on. Moreover, about the case where only an electric bed blanket (control) and a blank were used, in order to match a measurement position, the measurement was performed 8 mm above the electric bed blanket. The results are shown in Table 5.

  An electric field is generally said to cause dysfunction and neuropathy. As is clear from Table 5, the heat storage sheets I and II according to the present invention had an effect of largely shielding the electric field in the electromagnetic waves. In addition, the electromagnetic waves emitted from general household electric appliances are 50 to 60 Hz, and the wavelength is very long as 5,000 to 6,000 km.

Example 4 Manufacture of warming device and measurement of temperature drop characteristic of heat storage sheet (1) Manufacture of heat storage sheet A heat storage sheet 100 having the configuration shown in FIG. 4 was manufactured.

(A) Material constituting each layer [surfaces 1 and 3 of bag 10]
(Fiber layer a) Polyester / cotton (65% / 35%) woven fabric (No. 45 / No. 45; 110 pieces / 76 pieces); Pigment-dyed (anti-molding) product (Polymer sheet layer a) Low density polyethylene sheet Thickness: 30 μm
(Polymer sheet layer b) Linear low density polyethylene sheet; Thickness: 30 μm
(Fiber layer b) Spunlaced nonwoven fabric made of polyethylene terephthalate; basis weight: 45 g / m ²
[Layer of hydrous gel 5] Prepared using the composition of the formulation shown in Table 6;
Plaster amount: 5kg / m ²

A composite polyethylene sheet (water vapor barrier property) obtained by co-extrusion of the polymer sheet layer a (low density polyethylene sheet; thickness: 30 μm) and the polymer sheet layer b (linear low density polyethylene sheet; thickness: 30 μm). The moisture permeability (JIS Z0208) of the sheet was 2.0 g / m ² · 24 hours.

(B) Preparation of hydrous gel composition A hydrogel composition was prepared as follows.
(1) A component is dissolved in almost the whole amount of water (E component) to obtain one liquid.
(2) B component is added to 1 liquid, it stirs, B component is disperse | distributed, and 2 liquid is obtained.
(3) A mixture of C is prepared. This is 3 liquids.
(4) Add 3 liquids to 2 liquids and stir to obtain 4 liquids.
(5) Prepare a mixture of D. This is 5 liquids.
(6) Add 5 liquids to 4 liquids, stir and homogenize the whole.

(C) Manufacturing method of the composite (fiber layer a, polymer sheet layers a and b, and fiber layer b are laminated in this order) to be the surfaces 1 and 3 of the bag body 10 First, the nonwoven fabric to be the fiber layer b And a linear low density polyethylene sheet to be a polymer sheet layer b were bonded together by a dry lamination method to produce a preliminary composite. Next, the polymer sheet layer a is formed by extruding the low density polyethylene on the linear low density polyethylene sheet of the pre-composite, and a polyester / cotton woven fabric is laminated on the polymer sheet layer a to obtain the composite. Obtained.

(D) Manufacturing method of heat storage sheet (i) On the spun lace nonwoven fabric (fiber layer b) made of polyethylene terephthalate of the composite (the base substrate), the composition having the formulation shown in Table 6 was spread. The plaster was applied so that the amount was 5 kg / m ² .

  (Ii) Almost simultaneously with the plaster, the surface of the polyethylene terephthalate spunlace nonwoven fabric (fiber layer b) of the composite (which becomes the overlap base material) is directed to the gel, and the gel surface is coated with the composite, Sewed four rounds.

(Iii) In this way, a heat storage sheet having a width of 90 cm and a length of 120 cm and a hydrogel 5 layer size of 80 cm in width and 114 cm in length was manufactured.

(2) Manufacture of warming device The electric blanket 300 (100v / 50W; made by Sanyo Electric) of the structure shown in FIG. 3 was used as a heat generating body. The material of the electric blanket 300 (front and back) was as follows.
Fabric specifications: Warp 100% polyester
Weft Polyester (50%) / Acrylic (50%)
Woven density: 58 warps / inch
30 wefts / inch

  In order from the bottom, an aluminum foil-attached foamed polyethylene sheet (aluminum foil thickness: 7 μm; polyethylene thickness: 4 mm; the polyethylene sheet side is opposed to the electric blanket 300), an electric blanket 300, and ( The heat storage sheets 100 manufactured in 1) were stacked in this order to obtain a warming device. The area s of the portion formed by being surrounded by the outermost periphery of the wire heater 50 was about 90.3% of the area of the water-containing gel 5 layer of the heat storage sheet 100.

(3) Measurement of temperature drop characteristics of thermal storage sheet A mattress (50% polyester cotton / 50% wool; 5kg) is laid in a room set at 12 ° C. The foil was placed facing the mattress, and the heat storage sheet was covered with a cotton broad sheet. On top of that, a comforter containing polyester cotton (1.5 kg) was hung. In this state, the surface temperature of the heat storage sheet was measured.

  The electric blanket was energized (heater strength: strong), and energization was stopped after 90 minutes. Also at this time, the surface temperature of the heat storage sheet was measured at the same place.

  A 66-year-old man (body temperature: 35.8 ° C.) lay down on the heat storage sheet of the warming device and slept on a comforter. The next morning, the surface temperature of the heat storage sheet was measured at the same place.

  The above experiment was performed three times. The results are shown in Table 7. The bedtime was about 8 hours.

  As can be seen from Table 7, the surface temperature of the heat storage sheet almost decreases even when the electric blanket is not energized during sleeping for about 8 hours, together with the body temperature of the human body. Was maintained or an increase in temperature was observed. That is, if the heating device of the present invention is used, it is possible to warm up for a long time even after the electric blanket is turned off. In addition, after the electric blanket is turned off, the electric blanket does not generate electromagnetic waves. Therefore, the heating device of the present invention contributes to energy saving and also exhibits the effect of providing means for warming up without being adversely affected by electromagnetic waves.

Example 5 Measurement of temperature rise and descent characteristics of heat storage sheet in warming device Electrical flooring in which warming device used in Example 4 and aluminum foil of heat insulating sheet (foamed polyethylene sheet with aluminum foil) are opposed to electrical floor blanket Using a warming device that uses a blanket and a warming device that does not use a heat insulating sheet, the temperature rise and fall characteristics of the heat storage sheet were measured. Specifically, the surface temperature of the heat storage sheet was measured as follows.

(1) Configuration of Futon and Heating Device As shown in FIG. 9, (a) the heating device used in Example 4 (the heat insulating sheet 93a has the aluminum foil side facing the mattress 81), (b) heat insulation The sheet 93b is the same as the heating device of Example 4 except that the side of the aluminum foil faces the electric blanket 83, and (c) Example 4 except that the heat insulating sheet is not used. The same thing as the warming device was prepared.

  A warming device was laid on a mattress 81 similar to that of Example 4, and a comforter 91 similar to that of Example 4 was placed thereon. The electric blanket 83 was energized (heater strength: strong), and the surface temperature of the heat storage sheet 95 was measured with the temperature sensor 97 over time. The room temperature at this time was 15 ° C. The results are shown in Table 8 and FIG.

  The energization to the electric blanket 83 was stopped, and it was waited for the surface temperature of the heat storage sheet 95 to drop naturally. From the time when the temperature reached about 30 ° C., the surface temperature of the heat storage sheet 95 was measured over time. The results are shown in Table 9 and FIG.

  From the results shown in Tables 8 and 9 and FIGS. 10 and 11, it was revealed that the heat retention performance is enhanced by using the heat insulating sheet 93 (aluminum foil-attached foamed polyethylene sheet). In addition, the arrangement direction of the heat insulating sheet 93 also affects the heat retaining performance, and it is clear that a higher effect can be obtained by arranging the aluminum foil side in the outermost layer of the warming device (facing the mattress 81). became.

Example 6 Resilience Test Regarding the heat storage sheet I manufactured in Example 3, the resilience performance was tested. Specifically, a JIS specified steel ball having a weight of 5.7 kg and a diameter of 3/16 inch was naturally dropped from a height of 20 cm, and the rebound height of the steel ball was measured. For comparison, a similar test was performed on a commercially available flexible urethane foam. The results are shown in Table 10.

  As is clear from Table 10, the water-containing gel of the heat storage sheet I according to the present invention was low in resilience compared to the flexible urethane foam.

It is a perspective view which shows an example of the heating apparatus of this invention. It is sectional drawing in the xx line of the heating apparatus of FIG. It is a diagram which shows an example of the electric blanket used with the heating apparatus of this invention. It is sectional drawing which shows an example of the heat storage sheet which concerns on this invention. It is sectional drawing which shows the laminated body which consists of a metal foil located between two polymer sheets which can be used as a water vapor | steam barrier sheet layer. It is sectional drawing which shows the metallic or inorganic vapor deposition polymer sheet which has a metallic or inorganic vapor deposition layer which can be used as a water vapor | steam barrier sheet | seat layer. It is a schematic diagram which shows the measuring method of the jelly strength of a hydrous gel. It is a schematic diagram which shows the measuring method of electromagnetic waves. It is a diagram for demonstrating the experimental method which investigates the heat retention performance of the thermal storage sheet | seat in the warming apparatus of this invention. It is a graph which shows the temperature rise characteristic of a thermal storage sheet. It is a graph which shows the temperature fall characteristic of a thermal storage sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 One side 3 The other side 5 Hydrous gel 10 Bag body 20 Controller 30 Code 41 Adapter 43 Gel sample 45 Sample mount 50 Wire heater 60 Laminate 61, 63, 71 Polymer sheet 65 Metal foil 70 Metal system or inorganic vapor deposition polymer Sheet 75 Metallic or inorganic vapor deposition layer 81 Mattress 83,300 Electric blanket 85 Test material 87 Measuring instrument 89 Simple shield box 91 Quilt cover simple shield box 93a Thermal insulation sheet (aluminum foil laminated foamed polyethylene; aluminum foil is the mattress side)
93b Thermal insulation sheet (aluminum foil laminated polyethylene foam; aluminum foil is on the electric blanket side)
95,100 Thermal storage sheet 97 Temperature sensor

Claims (10)

A heating device comprising a heating element that generates heat when energized and a heat storage sheet that is used over the heating element, the heat storage sheet comprising a bag and a hydrous gel enclosed therein. A warming device. The heating apparatus according to claim 1, further comprising a heat insulating sheet, or the heating element having a heat insulating layer on one surface thereof. The heating apparatus according to claim 1 or 2, wherein the heating element is a planar heating element. The heating device according to claim 2 or 3, wherein the planar heating element generates heat by a wire heater or a conductive layer coupled to an electrode. The heating apparatus according to claim 4, wherein an area of a portion surrounded by the outermost periphery of the wire heater or the conductive layer is 60% or more of the area of the hydrogel layer of the heat storage sheet. The bag body has a water vapor barrier sheet layer having a moisture permeability of 30 g / m ² · 24 hours or less in JIS Z0208 (cup method; 40 ° C; 90% RH) on each of both surfaces thereof. The warming device according to any one of the above. The warming device according to any one of claims 1 to 6, wherein the moisture content of the hydrogel is 10 to 99.9 wt%. The warming device according to any one of claims 1 to 7, wherein the hydrogel further contains 2 to 10 wt% of a substance having electromagnetic wave shielding properties based on the total amount of the hydrogel. The hydrogel contains a cross-linked product of polyacrylic acid, and the amount of polyacrylic acid is 1 to 10% by weight and the amount of cross-linking agent is 0.01 to 0. 9. 1% to 8% prepared from a composition of 5% by weight, the amount of crosslinking retarder is 0.02 to 0.2% by weight and the amount of water is 50 to 95% by weight. The warming device according to any one of the above. The hydrogel contains a cross-linked product of polyacrylic acid, the amount of polyacrylic acid is 3 to 8% by weight, and the amount of cross-linking agent is 0.06 to 2. 9. 1% by weight, prepared from a composition in which the amount of crosslinking retarder is 0.02 to 0.5% by weight and the amount of water is 50 to 95% by weight. The warming device according to any one of the above.

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