A heating appliance

Abstract

A heating appliance (1) is provided with a heat generating body (3) containing a powder of an easily oxidizable metal (3a), a powder of a carbon material (3b), and a powder of a porous substance (3c) other than the easily oxidizable metal (3a) and the carbon material (3b). The heat generating body (3) is in the form of a sheet. In the heat generating body (3), the value obtained by multiplying the content mass ratio of water to the easily oxidizable metal (3a) by one hundred is preferably 30 or greater but 270 or less. In the heat generating body (3), the value obtained by multiplying the content mass ratio of the porous substance (3c) to the easily oxidizable metal (3a) by one hundred is preferably 1 or greater but 30 or less. In the heat generating body (3), the value obtained by multiplying the content mass ratio of the porous substance (3c) to water by one hundred is preferably 1 or greater but 30 or less.

Description

[0001] This application was filed on [date]. February 15, 2021 Application number is 202180030081.8 The invention is named heater Tool A divisional application of the patent application. Technical Field

[0002] This invention relates to a heating appliance. Background Technology

[0003] Heating appliances that utilize heat generated by the oxidation reaction of easily oxidizable metals are used for various purposes. For example, the applicant has previously proposed a powder-type heating element having a heating layer containing an easily oxidizable metal, a water-absorbing agent, and water, and an eye-use heating appliance having the same heating element (see Patent Document 1). Since the heating element described in that document contains water, water vapor is generated along with the oxidation reaction of the easily oxidizable metal.

[0004] In addition, the applicant has proposed a heating element comprising a heating layer containing an easily oxidizable metal, a water-absorbing agent, and water, and a water-retaining layer formed from a water-absorbing sheet, and a heating appliance having the heating element (see Patent Document 2). Since the heating element described in that document contains water, water vapor will be generated as a result of the oxidation reaction of the easily oxidizable metal.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2010-131088

[0008] Patent Document 2: US2014 / 373828 A1 Summary of the Invention

[0009] This invention relates to a heating appliance.

[0010] In one embodiment, a heating element is provided, which comprises powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0011] In one embodiment, the heating element is a sheet.

[0012] In one embodiment, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by 100 [100 × (water / easily oxidizable metal powder)] in the heating element is 30 or more and 270 or less.

[0013] In addition, the present invention relates to another type of heating appliance.

[0014] In one embodiment, a heating element is provided, which comprises powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0015] In one embodiment, the heating element is a sheet.

[0016] In one embodiment, the value obtained by multiplying the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by 100 [100 × (powder of porous material / powder of easily oxidizable metal)] in the heating element is 1 to 25.

[0017] Furthermore, the present invention relates to yet another type of heating appliance.

[0018] In one embodiment, a heating element is provided, which comprises powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0019] In one embodiment, the heating element is a sheet.

[0020] In one embodiment, the value obtained by multiplying the mass content of the porous material powder relative to the mass content of water by 100 [100 × (porous material powder / water)] is 1 to 30.

[0021] Other features of the invention will become apparent from the claims and the following description. Attached Figure Description

[0022] Figure 1 (a) and (b) are cross-sectional views schematically illustrating embodiments of the heating element in a heating appliance.

[0023] Figure 2 (a) to (c) are schematic cross-sectional views showing the configuration of the heating element and the layer of water-absorbing resin in a heated appliance.

[0024] Figure 3 It is a cross-sectional view schematically showing other configurations of the heating element and the layer of absorbent resin in a heated appliance.

[0025] Figure 4 This is a top view schematically illustrating one embodiment of a heating appliance.

[0026] Figure 5 It is a schematic representation Figure 4 An exploded perspective view of the heating appliance shown.

[0027] Figure 6 yes Figure 4 The diagram shows a cross-section of the heating appliance along its length, i.e., in the transverse direction.

[0028] Figure 7 yes Figure 5 A schematic diagram of an enlarged cross-section of the heating appliance shown.

[0029] Figure 8 It is a schematic representation Figure 4 The diagram shows the usage status of the heating appliance.

[0030] Figure 9 This is a top view schematically illustrating another embodiment of the heating appliance.

[0031] Figure 10 This is a top view schematically illustrating another embodiment of a heating appliance.

[0032] Figure 11 This is a perspective view schematically illustrating another embodiment of a heating appliance.

[0033] Figure 12 This is a schematic diagram of a device for measuring the amount of steam generated by heated appliances. Detailed Implementation

[0034] In recent years, in response to the growing demand for heated appliances, research is being conducted on technologies that improve heating characteristics to increase steam production.

[0035] As a method to improve heating characteristics, one could cite increasing the content of easily oxidizable metals, but in this case, the manufacturing cost increases or the mass of the target heating appliance increases.

[0036] In addition, the powder-type heating element disclosed in Patent Document 1 sometimes has uneven distribution of the constituent materials of the heating element, such as easily oxidizable metals, during use, leaving room for improvement in heating characteristics and water vapor generation.

[0037] In addition, the heating element disclosed in Patent Document 2 is sheet-shaped, which improves the heating characteristics, but it is expected that the heating characteristics and water vapor generation will be further improved while reducing manufacturing costs.

[0038] The inventors focused their research on improving heating characteristics and water vapor production, and unexpectedly discovered that by further incorporating porous materials other than easily oxidizable metals and carbon materials, it was possible to manufacture heating appliances with good heating characteristics and water vapor production while suppressing manufacturing costs.

[0039] Furthermore, it was discovered that by configuring one or more of the following in a specific relationship: the ratio of easily oxidizable metal to water, the ratio of easily oxidizable metal to porous material, and the ratio of water to porous material, it is possible to promote the oxidation reaction of easily oxidizable metal while suppressing manufacturing costs, thereby producing heating appliances with excellent heating characteristics and water vapor generation.

[0040] Therefore, the present invention relates to a heating appliance.

[0041] In one embodiment, the heating appliance exhibits excellent heating characteristics and water vapor production while suppressing manufacturing costs.

[0042] The present invention will now be described based on preferred embodiments.

[0043] In this specification, when an upper limit, lower limit, or both upper and lower limits are specified, the values ​​of the upper and lower limits themselves are included. Furthermore, unless otherwise explicitly stated, it is interpreted as all values ​​or ranges of values ​​described that are below the upper limit, above the lower limit, or within the range of both upper and lower limits.

[0044] In this specification, “a” and “an” are interpreted as one or more.

[0045] It should be understood that various modifications or alterations to the present invention are possible based on the following disclosures in this specification. Therefore, it should be understood that within the scope of the claims, embodiments not explicitly described in this specification may also be implemented.

[0046] The contents of the aforementioned patent documents and all other patent documents described below are incorporated into this specification as part of its contents.

[0047] The heating appliance of the present invention comes into contact with the object to be heated during use, and is used to impart heat to the object to be heated.

[0048] The object to be heated can be the skin or mucous membranes of the eyes, mouth, nose and surrounding areas, or the skin or mucous membranes of the throat, face, scalp, head, arms, shoulders, feet, knees, abdomen, back, waist, buttocks, etc., but it is not limited to these.

[0049] Examples of the heating appliances of the present invention include the following embodiments (a) to (d), but are not limited to these embodiments.

[0050] (a) It is configured to be in the shape of an eye patch that can be held in and around the eye.

[0051] (b) It is configured to remain attached to the head, arms, shoulders, feet, elbows, knees, forehead, abdomen, back or waist.

[0052] (c) It is configured to be a mask that can be held in place around the mouth, nose and surrounding area, or the entire face.

[0053] (d) It is shaped like a cup that can come into contact with the mouth, nose and surrounding area.

[0054] All disclosures in this specification can be applied to all of the above embodiments (a) to (d).

[0055] The heating appliance of the present invention includes a heating element.

[0056] The heating element preferably comprises (1) powder of an easily oxidizable metal, (2) powder of a carbon material, (3) powder of a porous material and (4) water.

[0057] Powders of easily oxidizable metals can generate heat through oxidation reactions with oxygen in the air, thus imparting warmth to the object being heated.

[0058] Carbon powder has the function of promoting the oxidation reaction of easily oxidized metals, thus enabling them to generate heat efficiently.

[0059] Powdered porous materials have the function of supplying water, which acts as a medium, to the reaction system to improve the heating efficiency when carbon powder promotes the oxidation reaction of easily oxidizable metals.

[0060] Furthermore, in this invention, the porous material contained in the heating element does not include easily oxidizable metals and carbon materials. That is, the heating element contains porous materials other than easily oxidizable metals and carbon materials.

[0061] Water facilitates the interaction between easily oxidizable metal powders and carbon materials that act as catalysts for oxidation reactions.

[0062] The heating element preferably comprises a mixture of materials including (1) to (4) above.

[0063] The heating element is preferably configured as a sheet.

[0064] A "sheet" is a thin object with two opposing surfaces, a small thickness between the surfaces, and is flexible and shape-preserving.

[0065] The sheet-like material has a thickness of 0.6 mm or more, preferably 0.8 mm or more, and even more preferably 1.0 mm or more.

[0066] In addition, the thickness of the sheet is 3.0 mm or less, preferably 2.8 mm or less, and even more preferably 2.0 mm or less.

[0067] The heating element constituting the heating appliance is preferably configured to react with oxygen in the air to generate heat, and to produce water vapor heated to a specified temperature along with the heat generated.

[0068] In this case, some of the water contained in the heating element may evaporate as water vapor due to the heat generated by the oxidation reaction of the easily oxidizable metal.

[0069] The morphology of the heating element can be exemplified by the following forms (i) and (ii).

[0070] As one form of heating element, one can cite (i) a sheet-like form in which the heating element is composed of a substrate sheet and a layer of heating composition disposed on one side thereof.

[0071] In this case, the layer of the heating composition is obtained by coating a slurry containing powders of easily oxidizable metals, powders of carbon materials, powders of porous substances, and water onto one side of a substrate sheet.

[0072] In the following description, the morphology of the heating element in (i) above will also be referred to as "coated type".

[0073] In addition, as another form of heating element, (ii) the heating element comprises powder of easily oxidizable metal, powder of carbon material, powder of porous material and water as a heating composition, preferably further comprising fibrous material, and the mixture of these is used for papermaking to form a sheet.

[0074] In the following description, the morphology of the heating element in (ii) above will also be referred to as "paper-making type".

[0075] The heating element can be directly used in any of the forms of (i) or (ii).

[0076] Alternatively, a substance that houses either (i) or (ii) a heating element within a breathable packaging material may be used.

[0077] In addition, packaging materials that do not allow solids to flow in or out are preferred.

[0078] When the heating element is housed within packaging material, the packaging material is separate from the heating element. That is, the packaging material does not constitute the heating element.

[0079] There are no particular restrictions on the shape of the packaging material, but a flat shape is preferred.

[0080] When the packaging material is formed in a flat shape, it is also preferable to form the packaging material by laminating it with a first sheet having breathability as one side and a second sheet having lower breathability than the first sheet as the other side.

[0081] One embodiment of the above-mentioned heating element is shown, for example, in... Figure 1 (a) and (b).

[0082] Figure 1 (a) is an example of a coated heating element. Figure 1 (b) is an example of a paper-making type heating element.

[0083] Figure 1 In (a) and (b), each component is represented as heating element 3, heating composition 30, substrate sheet 31, powder of easily oxidizable metal 3a, powder of carbon material 3b, powder of porous material 3c, fiber material 33 and packaging material 35.

[0084] The heating element constituting the heating appliance preferably has at least one of the following content ratios: the ratio of easily oxidizable metal to water, the ratio of easily oxidizable metal to porous material, and the ratio of water to porous material.

[0085] In detail, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 30 or more, more preferably 40 or more, even more preferably 80 or more, and even more preferably 110 or more.

[0086] Furthermore, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 270 or less, more preferably 250 or less, even more preferably 220 or less, and even more preferably 160 or less.

[0087] The value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred in this invention is calculated using the formula "100 × (mass of water [g] / mass of easily oxidizable metal powder [g])".

[0088] By setting the ratio of easily oxidizable metal to water to a specific ratio, it is possible to exhibit heating characteristics comparable to or better than existing heating appliances, even when the content of the easily oxidizable metal is lower than that of existing heating appliances. Furthermore, it is possible to reduce the manufacturing cost of the heating appliances.

[0089] In this invention, "reduction in manufacturing cost" means that, compared with existing heating appliances, the heating characteristics can be improved to the same level or above, and the content of easily oxidizable metals contained in the heating element can be reduced.

[0090] The heating element constituting the heating appliance is further optimized by setting the content ratio of easily oxidizable metal powder and water in the heating element to a specified range according to its shape.

[0091] The heating elements described in (i) and (ii) above are manufactured using different methods. In addition, the shape of the heating element is sometimes used flexibly depending on the target heating appliance.

[0092] Therefore, the preferred range is explained below for the ratio of easily oxidizable metal powder to water in the heating element, corresponding to the morphology of the heating element.

[0093] In detail, when the heating element is in the form of a coating, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 80 or more, more preferably 90 or more, and even more preferably 110 or more.

[0094] Furthermore, when the heating element is in the form of a coating, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 270 or less, more preferably 220 or less, and even more preferably 160 or less.

[0095] By setting the ratio of easily oxidizable metal to water in the coating process to such a ratio, even with a lower content of easily oxidizable metal than existing heating appliances, it is possible to obtain heating characteristics that are as good as or better than those of existing appliances.

[0096] By setting the content of easily oxidizable metals and water to a more favorable range, in addition to the aforementioned excellent heating characteristics, it is also possible to reduce the manufacturing cost of heating appliances.

[0097] Furthermore, by setting the content of easily oxidizable metals and water to a further preferred range, in addition to the aforementioned excellent heating characteristics and reduced manufacturing costs, the manufacturing efficiency of heated appliances with heating elements can also be improved.

[0098] Instead, when the heating element is in the form of a paper-making type, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 30 or more, more preferably 35 or more, and even more preferably 40 or more.

[0099] Furthermore, when the heating element is in the form of a paper-making type, the value obtained by multiplying the mass content of the water contained in the heating element to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is preferably 80 or less, more preferably 70 or less, and even more preferably 60 or less.

[0100] By setting the ratio of easily oxidizable metals to water in the papermaking process to such a ratio, even with a lower content of easily oxidizable metals than existing heating appliances, it is possible to obtain heating characteristics that are as good as or better than those of existing appliances.

[0101] By setting the content of easily oxidizable metals and water in the papermaking process to a more favorable range, in addition to exhibiting the aforementioned excellent heating characteristics, it is also possible to reduce the manufacturing cost of heating appliances.

[0102] Furthermore, by setting the content of easily oxidizable metals and water in the papermaking process to a further preferred range, in addition to exhibiting the aforementioned excellent heating characteristics and reducing manufacturing costs, the manufacturing efficiency of heated appliances with heating elements can also be improved.

[0103] Powders of easily oxidizable metals that constitute the heating element can include, for example, powders of iron, aluminum, zinc, manganese, magnesium, and calcium. These can be used alone or in combination of two or more.

[0104] From the perspectives of operability, safety, and manufacturing cost, metallic iron is preferred. That is, iron powder is preferred.

[0105] As for iron powder, one or more types selected from reduced iron powder and atomized iron powder can be listed, for example.

[0106] The powder of the easily oxidizable metal constituting the heating element can be an aggregate of metal particles that do not have pores on their surface, or it can be an aggregate of porous metal particles.

[0107] The carbon material powder used as the constituent of the heating element can have functions such as promoting oxidation reactions, specifically, having one or more functions such as being an oxygen-retaining supply material for easily oxidized metals and catalytic ability.

[0108] Examples of such carbon materials include: coconut shell carbon, carbon powder, pitch carbon, activated carbon such as peat and brown carbon, carbon black, acetylene black, and graphite powder. These can be used alone or in combination of two or more.

[0109] From the perspective of achieving a good balance between oxygen supply and catalytic ability, activated carbon powder is preferred as the carbon material powder.

[0110] The powder used as the porous material constituting the heating element can be any material other than the easily oxidizable metals and carbon materials mentioned above.

[0111] Porous materials can be porous materials with the function of retaining moisture, preferably porous inorganic compounds.

[0112] Specific examples of porous materials include zeolites, silica, vermiculite, pearlite, and silicon-containing inorganic compounds such as calcium silicate. These can be used alone or in combination of two or more.

[0113] In the porous material of the present invention, diatomaceous earth is excluded. That is, it is preferable that the porous material does not contain diatomaceous earth.

[0114] In addition, porous materials can be either anhydrous or hydrated.

[0115] The pores formed in porous materials can be open pores, closed pores, or a combination of these.

[0116] When using calcium silicate as a porous material, the following compounds can be listed: hydrated calcium silicate compounds, wollastonite compounds, sucralose calcium silicate compounds, and calcium silicate hydrate compounds. These can be used alone or in combination of two or more.

[0117] In detail, as a type of hydrous calcium silicate compound, the following can be listed: hydrous calcium silicate (Ca 16 (Si8O 20 )3(OH)8·14H2O), white calcium magnesium zeolite (Ca 14 (Si8O 20 (Si) 16 O 38 (Ca(Si2O5)·2H2O), and Z-phase (Ca(Si2O5)·2H2O), etc.

[0118] As wollastonite compounds, examples include: neo-calcium silicate (Ca3(Si6O3)2) 15 )·8H2O), fibrous calcium silicate (Ca3(Si6O) 15 )·6H2O), hard silica calcium stone (Ca6(Si6O) 17 (OH)2), orthorhombic calcium silicate (Ca4(Si3O9)(OH)2), and needle calcium silicate (Ca2(SiO3)(OH)2), etc.

[0119] Examples of sucralose compounds include: 14Å sucralose (Ca5(Si6O) 18 H2)·8H2O), 11Å calcium silicate (Ca5(Si6O) 18H2)·4H2O), and 9Å calcium silicate (Ca5(Si6O) 18 H2) and other calcium silicate, as well as quasicrystalline calcium silicate (Ca / Si molar ratio of 0.8 to 2.0), etc.

[0120] Examples of calcium silicate hydrates include tricalcium silicate hydrate (Ca6(Si2O7)(OH)6) and dicalcium silicate hydrate (Ca2(SiO4H)(OH)).

[0121] The aforementioned calcium silicate can be commercially available. For example, Florite R (registered trademark), a hydrous calcium silicate compound, can be used as a commercially available product.

[0122] From the viewpoint of achieving a good balance between water retention capacity and water supply capacity, and obtaining a heating element with improved heating characteristics due to the effective oxidation reaction of easily oxidizable metals, porous materials preferably contain the aforementioned silicon-containing inorganic compounds.

[0123] When a silicon-containing inorganic compound is included as a porous material, from the viewpoint of further improving the heating characteristics, the content of the silicon-containing inorganic compound in the porous material is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0124] From the same point of view, it is more preferable that the silicon-containing inorganic compound is composed of one or more of silicon dioxide and calcium silicate.

[0125] Furthermore, from the viewpoint of obtaining a heating element with excellent heating characteristics and water vapor generation, it is further preferred that the silicon-containing inorganic compound be composed of calcium silicate.

[0126] Furthermore, from the viewpoint of obtaining a heating element with superior heating properties, it is more preferable to use at least one of hydrous silicate, hard silicate and snow silicate as the porous material, and even more preferable to use hydrous silicate.

[0127] Next, another embodiment of the heating element in a heated appliance will be described.

[0128] The following description focuses on components that differ from those described in the above embodiments; identical components are omitted from the description. For components not specifically described in this embodiment, the descriptions related to the above embodiments shall apply appropriately.

[0129] In this embodiment, the heating element is preferably a mixture of porous material powder and easily oxidizable metal powder in a predetermined ratio.

[0130] By setting a predetermined ratio of easily oxidizable metals to porous materials, superior heating characteristics comparable to or better than existing heating appliances can be achieved even when the content of easily oxidizable metals is lower than that of existing heating appliances. Furthermore, it is possible to reduce the manufacturing cost of heating appliances with heating elements.

[0131] The heating element in this embodiment is similar to that in the above embodiments, preferably comprising powder of easily oxidizable metals, powder of carbon materials, powder of porous materials, and water.

[0132] In addition, the heating element in this embodiment is preferably a sheet.

[0133] In addition, the heating element in this embodiment is preferably a coated or paper-forming sheet.

[0134] In addition, the heating element in this embodiment preferably reacts with oxygen in the air to generate heat, and water vapor heated to a specified temperature is generated along with this heat generation.

[0135] In the heating element of this embodiment, the value obtained by multiplying the ratio of the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 1 or more, more preferably 3 or more, and even more preferably 5 or more.

[0136] Furthermore, the value obtained by multiplying the ratio of the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 25 or less, more preferably 20 or less, and even more preferably 15 or less.

[0137] By achieving this ratio, the oxidation reaction of easily oxidizable metals can be carried out fully and continuously, resulting in a heating appliance that exhibits excellent heating properties. Furthermore, it allows for a reduction in the manufacturing cost of the heating appliance.

[0138] The value obtained by multiplying the ratio of the mass content of porous material powder to the mass content of easily oxidizable metal powder by one hundred in this invention is calculated using the formula "100 × (mass of porous material powder [g] / mass of easily oxidizable metal powder [g])".

[0139] The ratio of easily oxidizable metals to porous materials in the heating element is preferably set within a specified range according to the implementation method of the heating appliance and the desired characteristics or effects.

[0140] In detail, for example, when the heating device is designed as an eye mask, and in order to reduce manufacturing costs, from the viewpoint of continuously exhibiting heating characteristics equal to or better than those of existing devices, the value obtained by multiplying the ratio of the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 1 or more, more preferably 3 or more, and even more preferably 5.

[0141] Furthermore, in this configuration, from the viewpoint of effectively reducing manufacturing costs by reducing the content of easily oxidizable metals to that of existing heating appliances, the value obtained by multiplying the mass content of porous material powder to the mass content of easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less.

[0142] As another embodiment regarding the content ratio of easily oxidizable metals to porous materials, for example, when the heating device is in the form of an eye mask, and in order to increase the amount of water vapor generated, from the viewpoint of continuously exhibiting heating characteristics equal to or better than those of the present, the value obtained by multiplying the ratio of the mass content of porous material powder to the mass content of easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more.

[0143] Furthermore, in this configuration, from the viewpoint of facilitating continuous generation of water vapor and increasing the amount of water vapor generated, the value obtained by multiplying the ratio of the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 20 or less, more preferably 18 or less, and even more preferably 14 or less.

[0144] As another embodiment regarding the content ratio of easily oxidizable metals to porous materials, for example, when the heating appliance is in the form of a mask or a cup, from the viewpoint of continuously imparting warmth to the heated object even after the heating appliance is removed from the heated object, the value obtained by multiplying the ratio of the mass content of porous material powder to the mass content of easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 3 or more, more preferably 5 or more, and even more preferably 6 or more.

[0145] Furthermore, from the viewpoint of facilitating the continuous generation of water vapor and increasing the amount of water vapor generated, the value obtained by multiplying the ratio of the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 15 or less, more preferably 11 or less, and even more preferably 8 or less.

[0146] Next, another embodiment of the heating element in a heating appliance will be described.

[0147] In the following description, similar to the embodiments described above, the description mainly focuses on the components that differ from those in the embodiments described above, while the description of the same components is omitted. For components not specifically described in this embodiment, the descriptions related to the embodiments described above shall be applied appropriately.

[0148] In this embodiment, the ratio of the mass content of the heating element to the water is preferably a specified ratio.

[0149] By setting a specific ratio of water to porous materials, superior heating characteristics comparable to or better than existing heating appliances can be achieved even with a lower content of easily oxidizable metals. Furthermore, it allows for a reduction in the manufacturing cost of the heating appliances.

[0150] The heating element in this embodiment is similar to that in the above embodiments, preferably comprising powder of easily oxidizable metals, powder of carbon materials, powder of porous materials, and water.

[0151] In addition, the heating element in this embodiment is preferably a sheet.

[0152] In addition, the heating element in this embodiment is preferably a coated or paper-forming sheet.

[0153] In addition, the heating element in this embodiment preferably reacts with oxygen in the air to generate heat, and water vapor heated to a specified temperature is generated along with this heat generation.

[0154] In the heating element of this embodiment, the value obtained by multiplying the mass content of the porous material powder to the mass content of water by one hundred [100×(porous material powder / water)] is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more.

[0155] Furthermore, the value obtained by multiplying the mass content of the porous material powder contained in the heating element by 100 [100×(porous material powder / water)] is preferably 30 or less, more preferably 20 or less, and even more preferably 15 or less.

[0156] By adopting such a configuration, the fine pores of the porous material allow for a proper balance between the supply of water that promotes the oxidation reaction of easily oxidizable metals and the supply of oxygen from the atmosphere. Therefore, the oxidation reaction of easily oxidizable metals can proceed sufficiently and continuously, resulting in a heating appliance exhibiting excellent heating properties. Furthermore, it allows for a reduction in the manufacturing cost of the heating appliance.

[0157] In the heating element of each of the above embodiments, the content ratio of easily oxidizable metal to water, the content ratio of easily oxidizable metal to porous material, and the content ratio of water to porous material can be any one of these satisfying an appropriate content ratio, or any two of these satisfying an appropriate content ratio, or all of these satisfying an appropriate content ratio.

[0158] That is, the heating element can satisfy only the appropriate content ratio of easily oxidizable metals and water, or only the appropriate content ratio of easily oxidizable metals and porous materials, or only the appropriate content ratio of water and porous materials.

[0159] By having any of the above-described configurations, even with a lower content of easily oxidizable metals than existing heating appliances, it is possible to obtain heating characteristics that are equal to or better than those of existing appliances.

[0160] In addition, the heating element can satisfy both the appropriate content ratio of easily oxidizable metals to water and the appropriate content ratio of easily oxidizable metals to porous materials, and can also satisfy both the appropriate content ratio of easily oxidizable metals to water and the appropriate content ratio of water to porous materials.

[0161] By combining any of the above-mentioned components, a good balance between oxygen supply capacity and catalytic capacity can be maintained. Therefore, even when the content of easily oxidizable metals is less than that of existing heating appliances, superior heating characteristics can be exhibited.

[0162] The heating element can also fully meet the appropriate content ratios of easily oxidizable metals and water, easily oxidizable metals and porous materials, and water and porous materials.

[0163] By designing a heating element that satisfies all these requirements, it is possible to maintain a better balance between oxygen supply and catalytic capacity, and to carry out the oxidation reaction of easily oxidizable metals fully and continuously. Therefore, even when the content of easily oxidizable metals is less than that of existing heating appliances, it can effectively exhibit superior heating characteristics that are equal to or better than those of existing appliances.

[0164] Furthermore, it can also seek to further reduce the manufacturing costs of heating elements and heating appliances containing them.

[0165] Furthermore, it can further improve the manufacturing efficiency of heating elements and heating appliances equipped with them.

[0166] The following describes matters that are commonly applied to the above-described embodiments.

[0167] From the viewpoint of obtaining heating appliances with excellent heating characteristics that can be continuously exhibited with high productivity, the pore diameter D1 of the particles constituting the porous material powder is preferably 0.01 μm or more, more preferably 0.02 μm or more, even more preferably 0.05 μm or more, even more preferably 0.1 μm or more, and even more preferably 0.15 μm or more.

[0168] Furthermore, the pore diameter D1 of the particles constituting the porous material powder is preferably 5 μm or less, more preferably 1 μm or less, even more preferably 0.8 μm or less, even more preferably 0.5 μm or less, and even more preferably 0.3 μm or less.

[0169] When calcium silicate is used as a porous material, the pore diameter D1 of its particles is more preferably 0.02 μm or more, even more preferably 0.05 μm or more, even more preferably 0.1 μm or more, and even more preferably 0.15 μm or more.

[0170] When calcium silicate is used as a porous material, the pore diameter D1 of its particles is more preferably 0.8 μm or less, more preferably 0.5 μm or less, and even more preferably 0.3 μm or less.

[0171] By setting the pore diameter D1 of the porous material within such a range, the moisture retained in the powder of the porous material can be efficiently transferred to the easily oxidized metal side, thereby further improving the heating characteristics.

[0172] The above-mentioned effect becomes significant by setting the pore diameter D1 to a more preferred range, and becomes even more significant by setting the pore diameter D1 to a further preferred range.

[0173] The pore diameter D1 of the aforementioned porous material can be determined, for example, by the mercury porosimetry method specified in JIS R1655.

[0174] Furthermore, when two or more porous materials are used, the pore diameter can be measured using a mixture of porous materials as the pore diameter D1.

[0175] The determination of pore diameter using the mercury intrusion porosimetry method specified in JIS R1655 can be performed, for example, by the following method: First, 0.02 g to 0.1 g of powder of the porous material to be tested is taken as the test sample. The test cell containing the test sample is placed in a mercury intrusion porosimeter (e.g., AutoPore IV9500, manufactured by Micromeritics). The cumulative pore volume V (cm³) of the test sample is measured when the mercury injection pressure P increases within a specified range. 3 / g). Next, with the converted pore diameter D (μm) calculated according to the following formula (A) as the horizontal axis, and the log differential pore volume (dV / d(log)) as the horizontal axis, the pore volume is plotted against the log differential pore volume (dV / d(log)). 10 D);cm 3 The pore volume distribution is obtained by plotting the relationship between / g) on ​​the vertical axis. That is, the pore volume distribution is obtained by plotting the converted pore diameter D on the horizontal axis and the pore volume obtained by differentiating the cumulative pore volume V using the logarithm of the pore diameter D on the vertical axis.

[0176]

[0177] (γ: surface tension of mercury; θ: contact angle; P: mercury injection pressure)

[0178] The above measurements were conducted at 22°C and 65%RH. The surface tension γ of mercury was set to 480 dyn / cm, the contact angle θ to 140°, and the mercury injection pressure P to be in the range of 0 psia (0 MPa) to 60,000 psia (413.685 MPa). Based on the distribution curve of the converted pore diameter D obtained under these measurement conditions, the cumulative total of the converted pore diameter D in the range of 0.0018 μm to 100 μm was taken as the cumulative pore volume V (mL / g), and the median pore diameter in the distribution curve was taken as the pore diameter D1 (μm) of the present invention.

[0179] The oil absorption capacity of the porous material powder is preferably 300 mL / 100g or more, more preferably 350 mL / 100g or more, and even more preferably 400 mL / 100g or more.

[0180] In addition, the oil absorption of the porous material powder is preferably 900 mL / 100g or less, more preferably 800 mL / 100g or less, and even more preferably 700 mL / 100g or less.

[0181] By achieving such a range of oil absorption, the water contained in the heating element can be fully retained within the particles of the porous material, and the water retained within the porous material can be transferred to the easily oxidized metal side more efficiently. Therefore, the heating characteristics can be continuously and effectively improved.

[0182] The oil absorption capacity of porous materials can be determined according to JIS K5010-13-2. Specifically, take 1-5g of the powdered sample of the test object and place it in the center of the test plate. Add 4-5 drops of cooked linseed oil to the center of the sample each time from the burette, and stir thoroughly with a palette knife each time. Repeat the addition of cooked linseed oil and stirring of the sample. When the sample becomes a relatively hard, putty-like lump, add 1 drop of cooked linseed oil and stir. The endpoint is when the sample can be rolled into a spiral shape with a palette knife after adding 1 drop of cooked linseed oil, and the amount of cooked linseed oil added at this point is recorded from the scale (mL). However, if the sample cannot be rolled into a spiral shape, the endpoint is when the sample is about to soften rapidly after adding 1 drop of cooked linseed oil, and the amount of cooked linseed oil added at this point is recorded from the scale (mL).

[0183] The amount of powder sample used for testing is determined according to JIS K5010-13-2 after preliminary testing to confirm the approximate value of oil absorption.

[0184] In addition, when two or more porous materials are used, the oil absorption is measured using a mixture of porous materials.

[0185] The amount of oil added (mL) obtained by the above method is converted into the amount of powder sample per 100g of the test object, and the oil absorption capacity (mL / 100g) of the present invention is calculated.

[0186] When the powder of an easily oxidizable metal is composed of particles with surface pores, it is preferable that the pore diameter D2 of the particles constituting the powder of the easily oxidizable metal is smaller than the pore diameter D1 of the powder of the porous material.

[0187] By forming such a structure, due to the difference in capillary force, the water retained by the porous material can be transferred to the easily oxidized metal side more efficiently, thereby further improving the heating characteristics.

[0188] In detail, the pore diameter D2 of the particles constituting the powder of the easily oxidizable metal is preferably 0.001 μm or more, more preferably 0.003 μm or more, and even more preferably 0.006 μm or more.

[0189] The pore diameter D2 of the particles constituting the powder of the easily oxidizable metal is preferably 0.07 μm or less, more preferably 0.05 μm or less, and even more preferably 0.01 μm or less.

[0190] By setting the range to such a degree, the water held by the porous material can be efficiently drawn into the easily oxidizable metal side due to the difference in capillary force. As a result, the oxidation reaction of the easily oxidizable metal can be further promoted, thereby further improving the heating characteristics.

[0191] Such powdered easily oxidizable metals can be manufactured, for example, by the method disclosed in EP3626367 A1.

[0192] The pore diameter D2 of the aforementioned easily oxidizable metal powder can be determined, for example, by the mercury porosimetry method specified in JIS R1655, as follows. Specifically, 0.02 g to 0.1 g of the easily oxidizable metal powder is used as the test sample. The test unit containing the test sample is placed in a mercury porosimeter (e.g., AutoPore IV9500, manufactured by Micromeritics). The cumulative pore volume V (cm²) of the test sample is measured when the mercury injection pressure P increases within a specified range. 3 / g). Next, with the converted pore diameter D (μm) calculated according to the following formula (A) as the horizontal axis, and the log differential pore volume (dV / d(log)) as the horizontal axis, the pore volume is plotted against the log differential pore volume (dV / d(log)). 10 D);cm 3 The pore volume distribution is obtained by plotting the relationship between / g) on ​​the vertical axis. That is, the pore volume distribution is obtained by plotting the converted pore diameter D on the horizontal axis and the pore volume obtained by differentiating the cumulative pore volume V using the logarithm of the pore diameter D on the vertical axis.

[0193]

[0194] (γ: surface tension of mercury; θ: contact angle; P: mercury injection pressure)

[0195] The above measurements were conducted at 22°C and 65%RH. The surface tension γ of mercury was set to 480 dyn / cm, the contact angle θ to 140°, and the mercury injection pressure P to be in the range of 0 psia (0 MPa) to 60,000 psia (413.685 MPa). Based on the distribution curve of the converted pore diameter D obtained under these measurement conditions, the cumulative total of the converted pore diameter D in the range of 0.0018 μm to 100 μm was taken as the cumulative pore volume V (mL / g), and the median pore diameter in the distribution curve was taken as the pore diameter D2 (μm) of the present invention.

[0196] From the viewpoint of balancing the continuous generation of water vapor and the moderate progress of the oxidation reaction, it is also preferable to further assemble a water-absorbing resin in or near the heating element.

[0197] From the viewpoint of balancing the continuous generation of water vapor and the moderate progress of oxidation reaction, and preventing accidental shedding of constituent materials, and further improving manufacturing efficiency, in the case of further configuring water-absorbing resin, it is more preferable to further configure packaging material, and to configure a layer containing powder of water-absorbing resin between the heating composition in the heating element and the packaging material.

[0198] Both coated and paper-making types can be applied to the above forms.

[0199] By further distributing a water-absorbing resin in or near the heating element, any remaining moisture present in the heating element can be absorbed. As a result, the oxidation reaction of easily oxidizable metals can be carried out efficiently, thereby improving the heating characteristics, and the moisture retained in the water-absorbing resin and heating element can be continuously released in the form of water vapor. Therefore, a comfortable temperature sensation can be provided to the user of the heated appliance.

[0200] When a water-absorbing resin is further disposed in or near the heating element, one possible way to present the water-absorbing resin is, for example, to mix the powder of the water-absorbing resin with powders of easily oxidizable metals, carbon materials, and porous substances in the heating composition of the heating element, as well as water. In this case, the powder of the water-absorbing resin constitutes part of the heating element.

[0201] Instead, another possible way in which the absorbent resin exists is by having a layer of powder containing the absorbent resin adjacent to the heating element. In this case, the layer of powder containing the absorbent resin is separate from the heating element.

[0202] Examples of ways in which a layer containing water-absorbing resin powder exists adjacent to a heating element include: (a) a single layer formed by sandwiching water-absorbing resin powder between two breathable sheets; (b) a single layer in which water-absorbing resin powder is in contact with the heating composition constituting the heating element without being separated from other components; or (c) a layered structure having a first water-absorbing resin layer and a second water-absorbing resin layer disposed in a manner that is disposed in relation to the heating composition constituting the heating element without being separated from other components, wherein the first water-absorbing resin layer is formed by sandwiching water-absorbing resin powder adjacent to each other in a layered manner, and the second water-absorbing resin layer is adjacent to the first water-absorbing resin layer and is formed by sandwiching water-absorbing resin powder between two breathable sheets.

[0203] That is, in any of the cases (a) to (c) above, it is preferable to arrange the heating composition constituting the heating element between the substrate sheet and the layer containing the water-absorbing resin powder.

[0204] Alternatively, another way in which the absorbent resin exists can be by configuring a layer containing absorbent resin powder as a substrate sheet, which exists adjacent to the heating composition in the heating element. In this case, the absorbent resin powder constitutes part of the heating element.

[0205] The layer containing the powder of the absorbent resin is preferably formed by sandwiching the absorbent resin between two breathable sheets. In this case, it is also preferable that the heating composition in the heating element is in contact with the outer surface of one of the breathable sheets.

[0206] When a layer containing powdered water-absorbing resin is configured as a substrate sheet, from the viewpoint of preventing accidental detachment of the constituent material, it is preferable that the layer containing powdered water-absorbing resin and the heating element are housed together in the packaging material.

[0207] When packaging materials are available, the packaging materials are preferably formed by laminating a first sheet with breathable properties on one side and a second sheet with lower breathability on the other side.

[0208] The packaging material is preferably flat.

[0209] When a layer containing powdered water-absorbing resin is configured as a substrate sheet and a packaging material is provided, it is even more preferable that the layer containing powdered water-absorbing resin is configured opposite to a first sheet of air-permeable material in the packaging material.

[0210] Regarding the manner in which the heating element and the absorbent resin coexist. Figure 2 (a) through (c) illustrate one way in which a layer of powder containing a water-absorbing resin exists adjacent to a heating element.

[0211] exist Figure 2 In the embodiments shown in (a) to (c), a layer 3L containing powder of water-absorbing resin 37 (hereinafter also referred to as water-absorbing resin layer 3L) is disposed between the heating composition 30 in the heating element 3 and the packaging material 35.

[0212] Furthermore, Figure 2 The heating element 3, the absorbent resin layer 3L, and the packaging material 35 shown in (a) to (c) are depicted with varying overall thicknesses, but this is done for ease of illustration only. Figure 2 The actual heating element 3, the water-absorbing resin layer 3L, and the packaging material 35 in each of the forms (a) to (c) may have the same or different thicknesses.

[0213] Specifically, when a 3L absorbent resin layer is provided, such as Figure 2 As shown in (a), the absorbent resin layer 3L is preferably formed by sandwiching the absorbent resin 37 between two breathable sheets 38, 38. In this case, it is also preferable that the absorbent resin layer 3L contacts the heating composition 30 constituting the heating element 3 through the breathable sheets 38.

[0214] In detail, it is preferable to arrange the heating composition 30 constituting the heating element 3 between the substrate sheet 31 and the water-absorbing resin layer 3L.

[0215] By adopting this configuration, it can continuously exhibit excellent heating characteristics and continuously release water vapor, producing more water vapor compared to existing heating appliances. Therefore, it can continuously provide a comfortable warmth and moisture to objects such as the eyes, nose, and throat.

[0216] The advantage of this composition in the absorbent resin layer is that, for example, the use of a heating device in the preferred form or attachment form of the eye mask allows the user's eyes and surrounding areas to continuously feel warmth, providing comfort to the user.

[0217] Instead, such as Figure 2 As shown in (b), in the water-absorbing resin layer 3L, it is also preferable that the water-absorbing resin 37 is in contact with the heating composition 30 constituting the heating element 3 in a layered manner without being separated from other components.

[0218] In detail, it is preferable to arrange the heating composition 30 constituting the heating element 3 between the substrate sheet 31 and the water-absorbing resin layer 3L.

[0219] By adopting this configuration, there are advantages such as the ability to generate more water vapor compared to existing heating appliances, thereby further increasing the amount of water vapor produced, so that heated objects such as the eyes, nose, mouth, and throat can feel a comfortable warmth and moisture.

[0220] The advantage of this composition in the absorbent resin layer is that, for example, the warming device used in the preferred mask shape allows the user's mouth and nose, as well as the surrounding area, to feel warmth and moisture over a wide area, providing comfort to the user.

[0221] In addition, instead, such as Figure 2 As shown in (c), the preferred water-absorbing resin layer 3L is a laminated structure in which a first water-absorbing resin layer 3s and a second water-absorbing resin layer 3t are disposed. The first water-absorbing resin layer 3s is formed by the water-absorbing resin 37 and the heating composition 30 constituting the heating element 3 being disposed adjacently without any other components in between. The second water-absorbing resin layer 3t is adjacent to the first water-absorbing resin layer 3s and is formed by sandwiching the water-absorbing resin 37 between two moisture-permeable sheets 38, 38.

[0222] In detail, it is preferable to arrange the heating composition 30 constituting the heating element 3 between the substrate sheet 31 and the water-absorbing resin layer 3L.

[0223] exist Figure 2 In the embodiment shown in (c), the water-absorbing resin layer 3L is a laminated structure in which the first water-absorbing resin layer 3s and the second water-absorbing resin layer 3t are disposed in contact.

[0224] By adopting such a configuration, the heating element can efficiently perform its heating response, generating a large amount of water vapor in a relatively short time. Therefore, objects being heated, such as the eyes, nose, mouth, and throat, can feel the warmth and moisture in advance.

[0225] The advantage of this composition in the absorbent resin layer is, for example, that a heating device, in the form of a preferred cup, can provide concentrated warmth and moisture to the user's mouth and nose and the surrounding area in a short time.

[0226] Regarding the manner in which the heating element and the absorbent resin coexist. Figure 3 Another embodiment is illustrated where a layer of powder containing a water-absorbing resin exists adjacent to a heating composition in a heating element.

[0227] exist Figure 3 In the embodiment shown, a water-absorbing resin layer 3L is disposed between the heating composition 30 in the heating element 3 and the packaging material 35.

[0228] like Figure 3 As shown, the preferred water-absorbing resin layer 3L is formed by sandwiching water-absorbing resin 37 between two breathable sheets 38, 38.

[0229] In addition, such as Figure 3 As shown, the heating composition 30 in the heating element 3 is preferably disposed in contact with one side of the moisture-permeable sheet 38. In this case, the water-absorbing resin layer 3L is also preferably used as the substrate sheet 31 in the heating element 3.

[0230] In such Figure 3 As shown, when the absorbent resin layer 3L is configured as the substrate sheet 31 and a flat packaging material 35 is provided, it is more preferable that the absorbent resin layer 3L is configured opposite to the first breathable sheet in the packaging material.

[0231] By adopting this configuration, it can continuously exhibit excellent heating characteristics and continuously release water vapor, producing more water vapor compared to existing heating appliances. Therefore, it can continuously provide a comfortable warmth and moisture to objects such as the eyes, nose, and throat.

[0232] The advantage of this composition in the absorbent resin layer is that, for example, the use of a heating device in the preferred form or attachment form of the eye mask allows the user's eyes and surrounding areas to continuously feel warmth, providing comfort to the user.

[0233] When the absorbent resin layer is arranged adjacent to the heating element, the absorbent resin layer is preferably configured as a sheet.

[0234] Specific examples of absorbent resins include: one or more of the following: starch, cross-linked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal salts of acrylate, polyacrylic acid and its salts, and polyacrylate grafted polymers.

[0235] Sodium salts can be used as polyacrylates.

[0236] In addition, as for the shape of water-absorbing resin, examples include particles composed of spheres, blocks, bunches, fibers, or combinations thereof.

[0237] The water-absorbing resin is preferably a powder composed of aggregates of particles.

[0238] As a breathable sheet material, materials such as tissue paper, absorbent paper, non-woven fabric, or fiber sheets or mesh can be used.

[0239] The preferred moisture-permeable sheet material is one that is breathable.

[0240] From the viewpoint of obtaining a heating appliance with good heating characteristics by properly controlling the oxidation reaction, the particle size of the particles constituting the powder of the easily oxidizable metal is preferably 1 μm or more, and more preferably 10 μm or more.

[0241] From the same point of view, the particle size of the powder constituting the easily oxidizable metal is preferably 200 μm or less, and more preferably 100 μm or less.

[0242] From the viewpoint of fully demonstrating the catalytic ability of the oxidation reaction and obtaining a heating appliance with good heating characteristics, the particle size of the carbon material powder constituting the powder is preferably 1 μm or more, and more preferably 10 μm or more.

[0243] From the same point of view, the particle size of the powder constituting the carbon material is preferably 200 μm or less, and more preferably 100 μm or less.

[0244] From the viewpoint of obtaining a heating appliance with good heating characteristics by properly controlling the retention and supply of water, the particle size of the particles constituting the porous material powder is preferably 1 μm or more, and more preferably 10 μm or more.

[0245] From the same point of view, the particle size of the powder constituting the porous material is preferably 200 μm or less, and more preferably 100 μm or less.

[0246] When using a water-absorbing resin as a powder, the particle size of the particles constituting the powder can be within the range commonly used in this technical field.

[0247] The particle size of the above materials can be set as the median particle size measured by laser diffraction scattering method using a laser diffraction / scattering particle size distribution measuring device (manufactured by Horiba Manufacturing Co., Ltd., model: LA-950V2)).

[0248] When the heating element is a paper-like sheet made of fibrous material, there are no particular restrictions on the fibrous material used; both natural and synthetic fibrous materials can be used.

[0249] Natural fiber materials include: plant fibers (cotton, kapok, wood pulp, non-wood pulp, peanut protein fiber, corn protein fiber, soybean protein fiber, mannan polysaccharide fiber, rubber fiber, hemp, Manila hemp, sisal, New Zealand hemp, Apocynum venetum, coconut, rush, wheat straw, etc.), animal fibers (wool, goat hair, mohair, cashmere, alpaca wool, Angora wool, camel hair, vicuña hair, silk, feathers, down, plumage, alginate fiber, chitin fiber, casein fiber, etc.), and mineral fibers (asbestos, etc.). These fiber materials can be used alone or in combination.

[0250] Examples of synthetic fiber materials include: semi-synthetic fibers (acetate, triacetate, oxyacetate, prometheus, chlorinated rubber, hydrochloric acid rubber, etc.), synthetic polymer fibers (nylon, polyaramid, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, etc., polyesters, polyacrylonitrile, acrylic acid, polyethylene, polypropylene, polystyrene, polyurethane, rayon, viscose rayon, cuprammonium fiber, etc.), metal fibers, carbon fibers, and glass fibers. These fiber materials can be used individually or in combination.

[0251] From the perspective of balancing the uniform dispersion of easily oxidizable metals with the oxygen permeability generated by ensuring voids, thereby improving heating characteristics, the fiber material preferably uses at least one of wood pulp, cotton, and polyester.

[0252] The average fiber length of the fiber material is preferably 0.5 mm or more, and more preferably 2 mm or more.

[0253] In addition, the average fiber length of the fiber material is preferably 10 mm or less, and more preferably 5 mm or less.

[0254] The average fiber length of the fiber material is set as the arithmetic mean of the measurement results obtained by the following method: taking more than 50 fiber materials as the measurement object, fixing one end of each fiber to a horizontal plate, and using calipers to measure the fiber length when the fiber is in a state of drooping due to its own weight, or fixing it on a microscope slide and measuring it with a microscope.

[0255] From the perspective that water vapor is easily generated along with the heating of the heating element, the heating element preferably contains an electrolyte.

[0256] Electrolytes contained in the heating element may include, for example, one or more of the following: salts of alkali metals or alkaline earth metals with phosphoric acid or sulfuric acid, or chlorides or hydroxides of alkali metals or alkaline earth metals.

[0257] From the viewpoint of achieving excellent chemical stability and production cost, one or more of tripotassium phosphate, potassium hydroxide, sodium chloride, and potassium chloride are preferred as electrolytes.

[0258] Electrolytes can be used, for example, in powder form or in liquid form dissolved or dispersed in a liquid medium such as water.

[0259] The heating element may consist only of powders of easily oxidizable metals, powders of carbon materials, powders of porous substances, water, and fiber materials as needed. Alternatively, in addition to various powders, water, and fiber materials as needed, the heating composition may also contain other powders besides powders of easily oxidizable metals, powders of carbon materials, and powders of porous substances.

[0260] Other powders may include one or more of the above-mentioned water-absorbing resins or electrolytes.

[0261] From the viewpoint of seeking further improvement in heating characteristics and water vapor generation, the content ratio of other powders in the heating element is expressed as the proportion of the total mass of all powders constituting the heating element, preferably 20% by mass or less, and more preferably 10% by mass or less.

[0262] From the perspective of seeking further improvement in heating characteristics and water vapor generation, the mass ratio of easily oxidizable metal powder, carbon material powder, and porous material powder relative to the total mass of all powders constituting the heating element is preferably 80% by mass or more, and more preferably 90% by mass or more.

[0263] When water-absorbing resin is included as another powder, its mass is based on the mass in the dry state.

[0264] The heating appliance with the above-described structure further incorporates porous materials other than easily oxidizable metals and carbon materials into the heating element of the sheet-like material, and appropriately sets at least one of the following ratios: the content ratio of easily oxidizable metal to water, the content ratio of easily oxidizable metal to porous material, and the content ratio of water to porous material. This promotes the oxidation reaction of the easily oxidizable metal, resulting in a heating appliance with a high cumulative sensible heat, expressed as the integral of temperature and heating duration, and excellent heating characteristics.

[0265] Furthermore, even with a reduction in the content of easily oxidizable metals compared to existing heating appliances, it still exhibits excellent heating characteristics. Therefore, it is possible to manufacture heating appliances with heating characteristics equal to or better than existing ones while controlling costs.

[0266] Furthermore, by appropriately setting at least one of the following ratios in the heating element: the ratio of easily oxidizable metal to water, the ratio of easily oxidizable metal to porous material, and the ratio of water to porous material, manufacturing costs are suppressed regardless of the form of the heating appliance, resulting in a heating appliance with excellent heating characteristics and water vapor generation.

[0267] Generally speaking, the oxidation reaction of easily oxidized metals may be affected by the amount of moisture and oxygen present around the metal powder.

[0268] In detail, when there is too much moisture around the metal powder, the moisture becomes an obstacle, making it difficult for the easily oxidized metal to come into contact with oxygen. As a result, the oxidation reaction does not continue or the start of the oxidation reaction is delayed.

[0269] On the other hand, when there is too little water around the metal powder, the easily oxidizable metal can easily come into contact with oxygen, but the interaction with carbon materials and other materials that act as catalysts for the oxidation reaction via water is not easy to occur. As a result, the oxidation reaction is not sustained sufficiently and it is difficult to exhibit the desired heating characteristics.

[0270] This suggests that by using porous materials, water can be adequately retained within the pores of the porous material, and the water retained in the porous material can be continuously supplied to the easily oxidized metal side in an appropriate amount, ensuring the necessary amount of water and oxygen for the oxidation reaction to continue.

[0271] In particular, easily oxidized metals form pores on their surface as oxidation reactions proceed, thus becoming porous. Therefore, through the capillary force generated between the porous material and the easily oxidized metal, water is continuously supplied from the porous material to the easily oxidized metal side. As a result, this type of heating appliance has superior heating characteristics because the oxidation reaction continues, heat is generated continuously for a long time, and the heating reaction continues.

[0272] This becomes more pronounced by using the aforementioned silicon-containing inorganic compounds, preferably calcium silicate, or more preferably calcium silicate, and even more preferably at least one of hydrous calcium silicate, diaspore, and shale.

[0273] In addition, due to the improved heating characteristics, the water contained in the heating element evaporates along with the heating, producing more water vapor compared to existing heating appliances. Therefore, it also has the advantage of increasing the amount of water vapor produced, allowing users of heating appliances to continuously feel a comfortable warmth.

[0274] Furthermore, the aforementioned heating characteristics and the increase in water vapor production can be easily achieved without depending on whether the packaging material is breathable or not, or the other sheets constituting the heating appliance, or the degree of breathability of the packaging material or other sheets constituting the heating appliance.

[0275] The heating appliance preferably has a main body and a heating element disposed on the main body.

[0276] The main body is preferably shaped to cover the object to be heated during use.

[0277] The heating appliance preferably has a front sheet located near the object being heated and a back sheet located away from the object being heated.

[0278] In detail, the heating appliance preferably has a front sheet located close to the user's skin and a back sheet located away from the user's skin.

[0279] The heating appliance preferably consists of the aforementioned front sheet and the aforementioned back sheet forming the main body.

[0280] The heating element is preferably positioned between the front sheet and the back sheet that constitute the main body.

[0281] The heating element is preferably housed within a breathable packaging material between the front and back sheets.

[0282] When the packaging material is formed from a first sheet and a second sheet, it is preferable that the breathable first sheet is positioned closer to the object being heated, specifically closer to the user's skin. That is, it is preferable that the first sheet is positioned opposite the front sheet.

[0283] When the packaging material is formed from a first sheet and a second sheet, it is preferable that the second sheet, which has lower breathability than the first sheet, is positioned on the side away from the object to be heated, specifically on the side away from the user's skin. That is, it is preferable that the second sheet is positioned opposite the back sheet.

[0284] The heating appliance preferably generates steam heated to a specified temperature. This allows it to impart warmth to the object being heated and its surroundings.

[0285] Hereinafter, one embodiment of the heating appliance will be described with reference to the accompanying drawings.

[0286] Figures 4 to 7 The image shows a heating device in the form of a so-called eye mask as one embodiment of a heating device.

[0287] That is, the present invention includes the use of a heated appliance as an eye mask and a method of using a heated appliance as an eye mask.

[0288] The following description focuses on components that differ from those described in the embodiments above. Identical components are marked with the same symbols and their descriptions are omitted. For components not specifically described in this embodiment, the descriptions of the above-described components shall apply appropriately.

[0289] The heating device of this embodiment is configured to be held in and around the eyes. The heating device is positioned to cover the eyes of the person being heated during use, thereby imparting warmth to the eyes and surrounding area.

[0290] The heating appliance generates water vapor heated to a specified temperature, thereby enabling it to impart warmth to the eyes and their surroundings, which are the objects to be heated.

[0291] The heating appliance of this embodiment preferably includes: a horizontally elongated main body that is shaped to cover the user's eyes when in use, and a heating element disposed on the main body.

[0292] Furthermore, the heating appliance in this embodiment preferably has a pair of ear loops installed on the main body. The ear loops can be used to maintain coverage of the user's eyes.

[0293] In the following description of this embodiment, the direction corresponding to the length direction of the heating appliance will be referred to as the transverse direction, and the direction orthogonal to the transverse direction will be referred to as the longitudinal direction.

[0294] The heating appliance in this embodiment is Figure 4 The example shows a heating appliance 1, a main body 2, a heating element 3, and a horizontal axis (X) and a vertical axis (Y).

[0295] Figure 4 In the heating device 1 shown, the ear loops 4 are located at the two outer ends of the horizontal X of the main body 2 and can be flipped outwards towards the horizontal X. Thus, each ear loop 4 can be hung on the user's ears, maintaining the state of covering the user's eyes created by the main body 2.

[0296] From the perspective of improving wearability, it is preferable that the sheet constituting the ear loop 4 is a stretchable sheet.

[0297] Figure 5 The image shows an exploded perspective view of the heating appliance 1 according to this embodiment.

[0298] in addition, Figure 6 The figure shows a cross-sectional view of the heating appliance 1 along the transverse direction X.

[0299] Figure 5 and Figure 6 The main body 2 of the heating appliance 1 shown is a flat component having a front sheet 5 located close to the user's skin and a back sheet 6 located away from the user's skin.

[0300] The front sheet 5 comprises the surface that comes into contact with the heated object, such as the eyes, mouth, or nose of a person, when using the heating appliance 1.

[0301] The back sheet 6 is the side furthest from the user's skin, forming the outer surface of the heating device 1. That is, Figure 5 and Figure 6 In the diagram, the top of the paper represents the side closer to the user's skin, while the bottom of the paper represents the side further away from the user's skin.

[0302] Figure 5 and Figure 6 The front sheet 5 and the back sheet 6 shown are joined together by an adhesive 7 such as a hot melt adhesive in an overlapping state, thereby housing two heating elements 3, 3 separately in the transverse X direction between the two sheets 5, 6.

[0303] That is, in this embodiment, the heating element 3 is configured to be non-detachable from the main body 2.

[0304] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 that constitute the main body 2.

[0305] At least the front sheet 5 of the front sheet 5 and the back sheet 6 is preferably made of a breathable fiber sheet.

[0306] A fiber sheet is an aggregate of multiple constituent fibers that are shaped into a sheet by at least one of the following methods: intertwining, fusing, and bonding.

[0307] The following section will provide a detailed description of each sheet 5 and 6.

[0308] Figure 6 The cross-sectional view shown illustrates the fixed state of the heating element 3.

[0309] like Figure 6 As shown, the heating element 3 is also preferably housed in a breathable packaging material 35 formed by bonding multiple sheets together through heat sealing or the like.

[0310] In this case, the heating element 3 is preferably held between the front sheet 5 and the back sheet 6 in a state of being housed in a breathable packaging material 35.

[0311] The packaging material 35 is preferably flat. In this case, the packaging material 35 is also preferably formed by laminating a first sheet with breathable properties on one side and a second sheet with lower breathability on the other side.

[0312] When the packaging material 35 is formed from the first sheet and the second sheet, the breathable first sheet is preferably positioned on the side closest to the user's skin. That is, the first sheet is preferably positioned opposite the front sheet 5.

[0313] When the packaging material 35 is formed from the first sheet and the second sheet, it is preferable that the second sheet, which has lower breathability than the first sheet, is positioned on the side furthest from the user's skin. That is, it is preferable that the second sheet is positioned opposite the back sheet 6.

[0314] In the case where the heated appliance 1 is constructed by including packaging material 35, such as Figure 6 As shown, the outer surface of the preferred packaging material 35 and the inner surface of the back sheet 6 in the heating appliance 1 are fixed by adhesive fixing parts 7a, 7a formed by adhesive 7, and other surfaces are not fixed to the back sheet 6.

[0315] Figure 6 In the illustrated embodiment, each adhesive fixing part 7a, 7a is disposed in the central region of the transverse X of the heating appliance 1 and extends along the longitudinal Y of the heating appliance 1.

[0316] With this configuration, when using the heating appliance 1, the heating element 3 can be fitted onto the object to be heated with high conformity, thereby efficiently imparting heat to the object.

[0317] Return to Figure 5 As shown in the figure, the ear loop 4 is preferably made of a sheet material, on which an insertion portion 4A extending in the transverse direction X is formed.

[0318] The insertion part 4A is a hole through which the ear passes when the ear-hook part 4 is hung on the ear.

[0319] Instead, the insertion part 4A can also be formed by a through slit or the like that allows the ear to pass through.

[0320] like Figure 5 and Figure 7 As shown, the ear portion 4 is joined to the outer surface of the front sheet 5 in the main body portion 2 at the two outer ends of the transverse X region, thereby forming the joining region 9 where the main body portion 2 and the ear portion 4 are joined.

[0321] The joint area 9 also functions as a bending part when the lug part 4 is flipped around the joint end 9s.

[0322] Figure 7 This is a cross-sectional view showing the shape of the joint area 9 in the heating appliance 1 of this embodiment.

[0323] Figure 5 and Figure 7 The joint area 9 of the main body 2 and the ear part 4 shown is preferably continuously joined from the inner end of the transverse X in the joint area 9, i.e. the joint end 9s, to the outer end of the transverse X in the main body 2, and is in a generally semi-elliptical shape.

[0324] like Figure 7As shown, the joining area 9 is preferably formed by joining the front sheet 5 in the main body 2 with the ear portion 4.

[0325] The joint area 9 preferably also functions as a bending part when the lug part 4 is flipped around the joint end 9s.

[0326] Figure 5 and Figure 7 The shown joint area 9 is formed by continuous joining, or it can be formed by intermittent joining.

[0327] about Figures 4 to 7 The illustrated eye mask-shaped heating device 1, as an example of its usage, is as follows: Figure 8 As shown, the heating device 1 can be held in the ear and used by using the ear loop 4.

[0328] By designing it in this way, regardless of the user's posture (e.g., lying down or sitting), the water vapor and warmth generated by the heating appliance 1 can be evenly applied to the user's eyes and surrounding area. This is advantageous in improving the versatility of the heating appliance 1 in terms of usage.

[0329] The following is for reference Figure 9 Another embodiment of the heating appliance 1 will be described. Figure 9 The image shows a heating appliance with a so-called adhesive form as one embodiment of a heating appliance.

[0330] That is, the present invention includes the use of a heated appliance as an adhesive form, and a method of using a heated appliance as an adhesive form.

[0331] The following description focuses on components that differ from those described in the embodiments above. Identical components are marked with the same symbols and their descriptions are omitted. For components not specifically described in this embodiment, the descriptions of the above-described components shall apply appropriately.

[0332] Figure 9 The image shows one embodiment in which the heating appliance 1 is attached.

[0333] The heating appliance 1 of this embodiment preferably includes a main body 2 and a heating element 3 disposed on the main body 2. The main body 2 has a front sheet 5 that forms the skin-facing side when in use and a back sheet 6 that forms the non-skin-facing side when in use.

[0334] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 that constitute the main body 2.

[0335] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 constituting the main body 2 in a state of being housed in a breathable packaging material 35.

[0336] In this embodiment, it is preferable that the front sheet 5 constituting the skin-facing side has an adhesive portion 51 on a portion or all of its outer surface.

[0337] The adhesive part 51 is used to keep the heating appliance 1 at the part where the heat and water vapor generated from the heating appliance 1 are applied.

[0338] By providing the adhesive part 51, it can be directly attached to the user's skin or to the user's clothing, thereby easily keeping the heating appliance 1 at the designated part of the object to be heated.

[0339] In addition, in order to exhibit the adhesiveness of the adhesive part at the desired time, a substrate such as a film covering the adhesive part may be provided.

[0340] The following is for reference Figure 10 Another embodiment of the heating appliance 1 will be described. Figure 10 The image shows a heating appliance in the form of a so-called mask as one embodiment of a heating appliance.

[0341] That is, the present invention includes the use of a heated appliance as a face mask and a method of using a heated appliance as a face mask.

[0342] The following descriptions mainly focus on components that differ from those described in the above embodiments. Identical components are marked with the same symbols and their descriptions are omitted. For components not specifically described in this embodiment, the descriptions of the above-described components shall apply appropriately.

[0343] Figure 10 The image shows one embodiment where the heating appliance 1 is configured as a face mask.

[0344] The heating appliance 1 of this embodiment preferably has a main body 2 that covers at least one of the user's mouth and nose when in use, and a heating element 3 disposed on the main body 2.

[0345] Furthermore, the heating appliance 1 of this embodiment preferably has a pair of ear loops 4 provided at the left and right ends of the main body 2. The ear loops can be used to maintain a state that covers at least one of the user's mouth and nose.

[0346] In this embodiment, the ear loop 4 is made of sheet material.

[0347] Preferably, the insertion part 4A is formed in the central region of the ear loop part 4.

[0348] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 that constitute the main body 2.

[0349] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 constituting the main body 2 in a state of being contained in a breathable packaging material 35.

[0350] like Figure 10 As shown, the heating appliance 1 of this embodiment preferably has a fold line 15 at a position corresponding to the user's nose bridge.

[0351] In this embodiment, the fold line 15 is provided in the transverse central region of the main body 2 in the heating appliance 1.

[0352] By adopting such a configuration, the heating device 1 in the form of a mask can, when in use, tightly seal the front sheet 5 according to the convex shape of the nose with the fold line 15 as the flexible axis. Therefore, it is not easy to create gaps between the heating device 1 and the object being heated, thus improving the heating and humidification effect.

[0353] Instead, a flat-shaped heating appliance 1 without the fold line 15 can also be made, depending on the intended use.

[0354] Regarding the method of using the heating device 1 in this embodiment, the heating device 1 can be used by holding it on the ear using the ear loop 4.

[0355] The following is for reference Figure 11 Another embodiment of the heating appliance 1 will be described. Figure 11 The image shows a heating appliance in the shape of a so-called cup as one embodiment of a heating appliance.

[0356] That is, the present invention includes the use of a heating appliance in the form of a cup, and a method of using the heating appliance in the form of a cup.

[0357] The following descriptions mainly focus on components that differ from those described in the above embodiments. Identical components are marked with the same symbols and their descriptions are omitted. For components not specifically described in this embodiment, the descriptions of the above-described components shall apply appropriately.

[0358] Figure 11 The image shows one embodiment where the heating appliance 1 is shaped like a cup.

[0359] The heating appliance 1 of this embodiment preferably has a main body 2 that covers at least one of the user's mouth and nose when in use, and a heating element 3 disposed on the main body 2.

[0360] The heating appliance 1 of this embodiment may or may not have an ear loop, depending on its purpose, which can maintain a state of covering at least one of the user's mouth and nose.

[0361] like Figure 11As shown, the heating appliance 1 in this embodiment preferably has a main body 2 consisting of a first plate portion 21 and a second plate portion 22 having a shape substantially the same as the first plate portion 21.

[0362] In this embodiment, it is preferable that both plate portions 21 and 22 are formed in a fan shape, and that the pointed portions of the two plate portions 21 and 22 are continuous.

[0363] Preferably, both the first plate portion 21 and the second plate portion 22 are composed of a continuous front sheet 5 and a continuous back sheet 6, with the heating element 3 held between the front sheet 5 and the back sheet 6.

[0364] The heating element 3 is preferably held between the front sheet 5 and the back sheet 6 constituting the main body 2 in a state of being contained in a breathable packaging material 35.

[0365] In this embodiment, the heating appliance 1 preferably has a boundary line D that serves as a flexible axis for bending the main body 2 in the continuous portion between the first plate portion 21 and the second plate portion 22.

[0366] In this embodiment, it is preferable that the first plate portion 21 and the second plate portion 22 are linearly symmetrical about the boundary line D.

[0367] In this embodiment, the heating appliance 1 is bent with the front sheet 5 facing each other around the boundary line D as the axis, and the first side edge 21A of the first plate portion 21 and the first side edge 22A of the second plate portion 22, as well as the second side edge 21B of the first plate portion 21 and the second side edge 22B of the second plate portion 22, are overlapped and joined together.

[0368] In the two plate portions 21 and 22, the third side edge 21C of the first plate portion 21 and the third side edge 22C of the second plate portion 22, located on the outer side, are not joined, forming an opening in the cup shape. This opening is preferably wide enough to cover the user's nose and mouth.

[0369] This results in a bottomed, cylindrical, cup-shaped heating appliance with its base at or near the boundary line D. The outer surface of this cup-shaped heating appliance is formed by the back sheet 6, and the inner surface is formed by the front sheet 5.

[0370] The cup-shaped heating appliance of this embodiment does not have a hanging loop. In this case, it is preferable that the cup-shaped heating appliance with a bottomed cylindrical shape has a main body that can be gripped by a person's hand. That is, it is preferable that the cup-shaped heating appliance is configured such that the main body can be gripped by a person's hand.

[0371] When using a cup-shaped heating device, for example, the opening of the device can be held near the user's nose and mouth by grasping the main body with one's hand.

[0372] Various sheets that can be used for ear loops, front and back sheets, as well as base sheets, packaging materials and moisture-permeable sheets can be appropriately determined by considering their air permeability, moisture permeability, feel, elasticity, strength, or the leak-proof properties of the constituent materials of the heat-generating composition.

[0373] As sheet materials, for example, non-woven fabric, woven fabric, paper and other fiber sheets, resin foam sheets, metal sheets or combinations thereof can be used.

[0374] Sheets can be a single structure consisting of a single sheet, whether it is a single layer or multiple layers, or a stacked structure consisting of two or more sheets overlapping each other.

[0375] For sheets with high breathability or moisture permeability, meltblown nonwoven fabric is preferred.

[0376] As a sheet material used to improve the feel, hot-air nonwoven fabric or thermally bonded nonwoven fabric is preferred.

[0377] As a sheet material used to demonstrate elasticity, hot-air nonwoven fabrics or spunbond nonwoven fabrics or thermally bonded nonwoven fabrics containing synthetic fibers such as polyethylene terephthalate (PET), polyethylene, and polypropylene can be used.

[0378] As a sheet material used to impart strength, spunbond nonwoven fabric, spunlace nonwoven fabric, needle-punched nonwoven fabric, chemically bonded nonwoven fabric, etc. are preferred.

[0379] In addition to the nonwoven fabrics mentioned above, or as alternatives, nonwoven fabrics obtained by surface treatment of nonwoven fabrics using silicone or surfactants can be used, or foamed sheets made from thermoplastic resins such as polyethylene or polyurethane can be used.

[0380] In addition, these sheets can be used by mixing different fibers with different raw materials, fiber diameters, and fiber crimping degrees, or by combining different sheets to exhibit the desired properties.

[0381] The ear loops, front and back sheets, substrate sheets, packaging materials and moisture-permeable sheets can each be a single structure consisting of a single sheet, whether single or multi-layered, or a stacked structure consisting of two or more sheets.

[0382] The front sheet is preferably made of fiber sheet as described above.

[0383] From the perspective of improving the manufacturing efficiency of heated appliances, at least one of needle-punched nonwoven fabric, hot-air nonwoven fabric, spunbond nonwoven fabric, and chemically bonded nonwoven fabric is preferred.

[0384] When using nonwoven fabrics or other fiber sheets as both the front and back sheets, both sheets should preferably be breathable. "Breathable" means that the air permeability, as measured according to JIS P8117:2009, is less than 10,000 seconds / 100 mL. Air permeability, as measured according to JIS P8117, is defined as 6.42 cm of air passing through 100 mL at room temperature and pressure. 2 The time required to measure the area.

[0385] Specifically, the air permeability of the front sheet and the back sheet is preferably 0.01 seconds / 100mL or more, and more preferably 0.03 seconds / 100mL or more.

[0386] Air permeability is measured according to JIS P8117:2009. Lower air permeability means that air passes through quickly, thus indicating higher air permeability.

[0387] By using a front sheet with such breathability, it is possible to efficiently impart heat and water vapor to the object being heated, and to efficiently control the oxidation reaction of easily oxidized metals, thereby obtaining a heating appliance with the desired heating characteristics.

[0388] In the case of a packaging material that is breathable, and the packaging material includes a first sheet that is breathable and a second sheet that is less breathable than the first sheet, the breathability of the first sheet constituting the packaging material is preferably 20 seconds / 100mL or more, more preferably 30 seconds / 100mL or more, and even more preferably 40 seconds / 100mL or more.

[0389] In addition, the air permeability of the first sheet is preferably 25,000 seconds / 100mL or less, more preferably 15,000 seconds / 100mL or less, and even more preferably 10,000 seconds / 100mL or less.

[0390] The first sheet having the above-mentioned air permeability can be, for example, a sheet with multiple through holes in the resin film, or a film obtained by uniaxially or biaxially stretching a sheet made of a resin composition containing fillers such as polyethylene and calcium carbonate. The air permeability can be appropriately changed by adjusting the degree of stretching.

[0391] Sheets that can be applied to the first sheet are disclosed, for example, in EP1939240 A1.

[0392] In the case of a packaging material that is breathable, and the packaging material includes a first sheet that is breathable and a second sheet that is less breathable than the first sheet, the breathability of the second sheet constituting the packaging material is preferably 10,000 seconds / 100 mL or more, more preferably 25,000 seconds / 100 mL or more. From the viewpoint of exhibiting sufficient and appropriate heating characteristics and fully imparting water vapor to the object being heated, it is even more preferable to be non-breathable.

[0393] "Not breathable" means that the air permeability is above 80,000 seconds / 100mL as measured by JIS P8117:2009.

[0394] As a second sheet with the aforementioned air permeability, for example, a resin film with fewer through holes than the first sheet or without through holes can be used.

[0395] In the case of a packaging material that is breathable, and the packaging material includes a first sheet that is breathable and a second sheet that is less breathable than the first sheet, the moisture permeability of the first sheet, as measured according to JIS Z0208, is preferably 480 g / (m³). 2 • 24h or more, more preferably 720g / (m 2 ·24h) or more, further preferably 960g / (m 2 ·24h) or more.

[0396] Furthermore, the moisture permeability of the first sheet, as measured by JIS Z0208, is preferably 5000 g / (m²). 2 ·24h or less, more preferably 4750g / (m 2 ·24h or less, further preferably 4500g / (m 2 ·24h and below.

[0397] Furthermore, the moisture permeability of the second sheet, as measured by JIS Z0208, is preferably 480 g / (m²). 2 ·24h) or less, more preferably 240g / (m 2 ·24h or less, further preferably 0g / (m 2 •24h).

[0398] By independently setting the permeability of the first sheet and the second sheet to the above range, sufficient and moderate heating characteristics can be exhibited, and water vapor can be fully imparted to the object being heated.

[0399] Sheets that meet such moisture permeability requirements can, for example, use the same sheets described above regarding air permeability.

[0400] When using fiber sheet as the front sheet, the basis weight of the front sheet is preferably 10 g / m². 2 The above, preferably 30g / m2 The above is further preferred to be 50g / m 2 above.

[0401] The preferred basis weight of the front sheet is 200 g / m². 2 The following is more preferably 130g / m 2 The following is a further preferred value: 100g / m 2 the following.

[0402] Furthermore, when using fiber sheet as the back sheet, from the viewpoint of improving thermal insulation and printability, it is preferable that the basis weight of the back sheet is less than that of the front sheet.

[0403] Specifically, the basis weight of the back sheet is preferably 10 g / m². 2 The above is further preferred to be 20g / m 2 above.

[0404] The preferred basis weight of the back sheet is 100 g / m². 2 The following is a further preferred value: 80g / m 2 the following.

[0405] When the front and back sheets have a laminated structure, the overall basis weight of the sheets only needs to be within the above range.

[0406] In the context of breathable sheets, "moisture permeability" refers to a sheet with a moisture permeability of 2000 g / (m³) as measured according to JIS Z0208. 2 ·24h) or more.

[0407] Specifically, for breathable sheets, the preferred moisture permeability, as measured according to JIS Z0208, is 2000 g / (m³). 2 • 24h or more, more preferably 2500g / (m 2 • 24h or more, more preferably 3000g / (m 2 ·24h) or more.

[0408] Sheets with the above-mentioned moisture permeability are preferably used as moisture permeable sheets in absorbent resin layers. When using multiple moisture permeable sheets, the moisture permeability values ​​of each sheet can be the same or different.

[0409] When a heating appliance has ear loops, the shape of the ear loops is not limited to any way that can secure the main body to the user's eyes. Figure 4 and Figure 5 The sheet-like component shown.

[0410] For example, a hanging part made of rope-like components or a hanging part made of linear or strip-like components can be used instead of a hanging part made of sheet material.

[0411] From the perspective of improving the fit of heated appliances, it is preferable to use elastomers such as rubber to make stretchable hanging parts 4.

[0412] Figure 4 , Figure 9 , Figure 10 and Figure 11 The heating element in the heating appliance shown in the embodiment is described as being held separately as two heating elements, but the shape of the heating element is not particularly limited as long as it can impart a temperature sensation to the object being heated and its surroundings.

[0413] For example, one heating element with a shape and size that can cover the object being heated and its surroundings can be held between the front sheet and the back sheet, or three or more heating elements can be held between the front sheet and the back sheet.

[0414] in addition, Figure 5 and Figure 6 The heating element shown is fixed only in a portion of the transverse central region of the heating appliance, but is not limited to this form.

[0415] For example, the heating element and the back sheet can be joined continuously or intermittently by adhesive in the central region and other areas in the transverse direction, or they can be joined by applying adhesive to the entire surface of the back sheet where the heating element is located.

[0416] The present invention has been described above based on preferred embodiments, but the present invention is not limited to the above embodiments.

[0417] Regarding the embodiments of the present invention described above, the following heating appliances are further disclosed.

[0418] <1>

[0419] A heating appliance includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0420] The heating element is a sheet-like material.

[0421] In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred [100×(water / easily oxidizable metal powder)] is more than 30 and less than 270.

[0422] <2>

[0423] A heating appliance includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0424] The heating element is a sheet-like material.

[0425] In the heating element, the value obtained by multiplying the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100 × (powder of porous material / powder of easily oxidizable metal)] is more than 1 and less than 25.

[0426] <3>

[0427] A heating appliance includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material.

[0428] The heating element is a sheet-like material.

[0429] In the heating element, the value obtained by multiplying the mass content of the porous material powder relative to the mass content of water by 100 [100 × (porous material powder / water)] is more than 1 and less than 30.

[0430] <4>

[0431] In any of the heating appliances described in any one of <1> to <3> above, the value obtained by multiplying the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 1 or more, more preferably 3 or more, and even more preferably 5 or more.

[0432] <5>

[0433] In any of the heating appliances described in any one of <1> to <4> above, the value obtained by multiplying the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred [100×(powder of porous material / powder of easily oxidizable metal)] is preferably 25 or less, more preferably 20 or less, and even more preferably 15 or less.

[0434] <6>

[0435] In any of the above-described heating appliances (1 to 5), the value obtained by multiplying the mass content of the porous material powder relative to the mass content of water in the heating element by 100 [100 × (porous material powder / water)] is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more.

[0436] <7>

[0437] In any of the heating appliances described in any one of <1> to <6> above, the value obtained by multiplying the mass content of the porous material powder in the heating element by one hundred [100×(porous material powder / water)] is preferably 30 or less, more preferably 20 or less, and even more preferably 15 or less.

[0438] <8>

[0439] The heating appliance as described in any one of <1> to <7> above, wherein the heating element is housed within a breathable packaging material.

[0440] A layer containing powdered water-absorbing resin is disposed between the heating element and the packaging material.

[0441] <9>

[0442] As described in <8> above, the heating appliance wherein the powder of the water-absorbing resin is sandwiched between two breathable sheets to form the layer.

[0443] <10>

[0444] As described in <9> above, the moisture permeability of the heat-generating appliance, as determined according to JIS Z0208, is preferably 2000 g / (m³) independently. 2 • 24h or more, more preferably 2500g / (m 2 • 24h or more, more preferably 3000g / (m 2 ·24h) or more.

[0445] <11>

[0446] The heating appliance as described in any one of <8> to <10> above, wherein the packaging material preferably consists of a first sheet with breathable properties forming one side.

[0447] The packaging material is preferably composed of a second sheet with lower air permeability than the first sheet, forming the other side.

[0448] <12>

[0449] The heating appliance described in <11> above, wherein, more preferably, the layer comprising the powder of the absorbent resin is disposed opposite to the first sheet in the packaging material.

[0450] <13>

[0451] The heating appliance as described in any one of <1> to <12> above, wherein the heating element is a sheet-like object composed of a substrate sheet and a layer of heating composition disposed on one side thereof.

[0452] In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred [100 × (water / easily oxidizable metal powder)] is between 80 and 270.

[0453] The layer of the heating composition is obtained from a slurry containing powder of the easily oxidizable metal, powder of the carbon material, powder of the porous material, and water.

[0454] <14>

[0455] In the heating appliance described in <13> above, the value obtained by multiplying the mass content of water in the heating element by 100 [100×(water / powder of easily oxidizable metal)] is preferably 80 or more, more preferably 90 or more, and even more preferably 110 or more.

[0456] <15>

[0457] In the heating appliance described in <13> or <14> above, the value obtained by multiplying the mass content of water in the heating element by one hundred [100×(water / powder of easily oxidizable metal)] is preferably 270 or less, more preferably 220 or less, and even more preferably 160 or less.

[0458] <16>

[0459] The heating appliance as described in any one of <1> to <15> above, wherein the heating element is composed of a substrate sheet and a layer of heating composition disposed on one side thereof.

[0460] The layer of the heating composition is obtained from a slurry comprising the powder of the easily oxidizable metal, the powder of the carbon material, the powder of the porous material, and water.

[0461] The heating appliance further comprises a layer containing powder of a water-absorbing resin.

[0462] The heating composition is disposed between the substrate sheet and the layer containing the water-absorbing resin powder.

[0463] <17>

[0464] The heating appliance as described in any one of <1> to <16> above, wherein the heating element is composed of a substrate sheet and a layer of heating composition disposed on one side thereof.

[0465] The layer of the heating composition is obtained from a slurry comprising the powder of the easily oxidizable metal, the powder of the carbon material, the powder of the porous material, and water.

[0466] The heating appliance further comprises a layer containing powder of a water-absorbing resin.

[0467] The layer containing the powder of the water-absorbing resin is configured as the substrate sheet.

[0468] <18>

[0469] The heating appliance as described in any one of <1> to <12> above, wherein the heating element is a sheet-like material formed by mixing the powder of the easily oxidizable metal, the powder of the carbon material, the powder of the porous material, water, and the fibrous material.

[0470] In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by 100 [100×(water / easily oxidizable metal powder)] is 30 to 80.

[0471] <19>

[0472] The heating appliance described in <18> above, wherein the fiber material preferably includes at least one of wood pulp, cotton and polyester.

[0473] <20>

[0474] In the heating appliance described in <18> or <19> above, the value obtained by multiplying the mass content of water in the heating element by one hundred [100×(water / powder of easily oxidizable metal)] is preferably 30 or more, more preferably 35 or more, and even more preferably 40 or more.

[0475] <21>

[0476] In any of the above-described heating appliances (18 to 20), the value obtained by multiplying the mass content of water in the heating element by 100 [100 × (water / powder of easily oxidizable metal)] is preferably 80 or less, more preferably 70 or less, and even more preferably 60 or less.

[0477] <22>

[0478] The heating appliance as described in any one of <1> to <21> above, wherein the pore diameter of the porous material is 0.01 μm or more and 5 μm or less.

[0479] <23>

[0480] The heating appliance as described in any one of <1> to <22> above, wherein the pore diameter of the porous material is preferably 0.01 μm or more, more preferably 0.02 μm or more, even more preferably 0.05 μm or more, even more preferably 0.1 μm or more, and even more preferably 0.15 μm or more.

[0481] <24>

[0482] The heating appliance as described in any one of <1> to <23> above, wherein the pore diameter of the porous material is preferably 5 μm or less, more preferably 1 μm or less, even more preferably 0.8 μm or less, even more preferably 0.5 μm or less, and even more preferably 0.3 μm or less.

[0483] <25>

[0484] The heating appliance as described in any one of <1> to <24> above, wherein the porous material is composed of a silicon-containing inorganic compound.

[0485] <26>

[0486] The heating appliance as described in any one of <1> to <25> above, wherein the porous material is composed of calcium silicate.

[0487] <27>

[0488] As described in <26> above, the pore diameter of the calcium silicate is between 0.02 μm and 0.8 μm.

[0489] <28>

[0490] In the heating appliance described in <26> or <27> above, the pore diameter of the calcium silicate is more preferably 0.02 μm or more, even more preferably 0.05 μm or more, even more preferably 0.1 μm or more, and even more preferably 0.15 μm or more.

[0491] <29>

[0492] The heating appliance as described in any one of <26> to <28> above, wherein the pore diameter of the calcium silicate is more preferably 0.8 μm or less, more preferably 0.5 μm or less, and even more preferably 0.3 μm or less.

[0493] <30>

[0494] The heating appliance as described in any one of <26> to <29> above, wherein the calcium silicate is one or more of the following: calcium silicate hydrous silicate compounds, wollastonite compounds, calcium silicate hydrous silicate compounds, and calcium silicate hydrate compounds.

[0495] <31>

[0496] The heating appliance as described in any one of <1> to <30> above, wherein the porous material is more preferably one or more of diaspore, hard silica, and shale.

[0497] The porous material is more preferably hydrous calcium silicate.

[0498] <32>

[0499] The heating appliance as described in any one of <1> to <31> above, wherein the oil absorption of the powder of the porous material, as measured according to JIS K5010-13-2, is preferably 300 mL / 100 g or more, more preferably 350 mL / 100 g or more, and even more preferably 400 mL / 100 g or more.

[0500] <33>

[0501] The heating appliance as described in any one of <1> to <32> above, wherein the oil absorption of the powder of the porous material, as measured according to JIS K5010-13-2, is preferably 900 mL / 100 g or less, more preferably 800 mL / 100 g or less, and even more preferably 700 mL / 100 g or less.

[0502] <34>

[0503] In the heating appliance described in any one of <1> to <33> above, the particle size of the powder constituting the porous material is preferably 1 μm or more, more preferably 10 μm or more.

[0504] The particle size of the powder constituting the porous material is preferably 200 μm or less, and more preferably 100 μm or less.

[0505] <35>

[0506] In any of the heating appliances described in <1> to <34> above, the powder of the easily oxidizable metal is preferably iron powder.

[0507] Further preferably, it is selected from one or more types of reduced iron powder and atomized iron powder.

[0508] <36>

[0509] The heating appliance as described in any one of <1> to <35> above, wherein the powder of the easily oxidized metal is composed of particles with porous surfaces.

[0510] The pore diameter of the particles constituting the easily oxidizable metal powder is preferably smaller than the pore diameter of the porous material powder.

[0511] <37>

[0512] In the heating appliance described in <36> above, the pore diameter of the particles constituting the easily oxidized metal powder is preferably 0.001 μm or more, more preferably 0.003 μm or more, and even more preferably 0.006 μm or more.

[0513] The pore diameter of the particles constituting the powder of the easily oxidized metal is preferably 0.07 μm or less, more preferably 0.05 μm or less, and even more preferably 0.01 μm or less.

[0514] <38>

[0515] In the heating appliance described in any one of <1> to <37> above, the particle size of the powder constituting the easily oxidizable metal is preferably 1 μm or more, more preferably 10 μm or more.

[0516] The particle size of the powder constituting the easily oxidizable metal is preferably less than 200 μm, and more preferably less than 100 μm.

[0517] <39>

[0518] The heating appliance as described in any one of <1> to <38> above, wherein it is preferred to use activated carbon powder as the powder of the carbon material.

[0519] <40>

[0520] In any of the heating appliances described in any of <1> to <39> above, the particle size of the powder constituting the carbon material is preferably 1 μm or more, more preferably 10 μm or more.

[0521] The particle size of the powder constituting the carbon material is preferably less than 200 μm, and more preferably less than 100 μm.

[0522] <41>

[0523] The heating appliance as described in any one of <1> to <40> above, wherein the heating element preferably contains an electrolyte.

[0524] <42>

[0525] The heating appliance as described in any one of <1> to <41> above comprises: a main body having a shape that covers the object to be heated when in use, and the heating element disposed on the main body.

[0526] The main body includes a front sheet located near the object to be heated and a back sheet located away from the object to be heated.

[0527] The heating element is held between the front sheet and the back sheet.

[0528] <43>

[0529] The heating appliance as described in any one of <1> to <42> above comprises: a main body having a shape that covers the user's eyes when in use, a heating element disposed on the main body, and a pair of ear loops mounted on the main body and capable of maintaining the state in which the main body covers the user's eyes.

[0530] The main body includes a front sheet located close to the user's skin and a back sheet located away from the user's skin.

[0531] The heating element is held between the front sheet and the back sheet.

[0532] <44>

[0533] As described in <42> above, the heating appliance preferably has an adhesive portion provided on a portion or all of its outer surface.

[0534] <45>

[0535] The heating appliance as described in any one of <1> to <42> above comprises: a main body portion having a shape that covers at least one of the user's mouth and nose when in use, and the heating element disposed on the main body portion.

[0536] The main body includes a front sheet located close to the user's skin and a back sheet located away from the user's skin.

[0537] The heating element is held between the front sheet and the back sheet.

[0538] <46>

[0539] The heating appliance described in <45> above further includes a pair of ear loops installed on the main body and capable of maintaining a state in which the main body covers at least one of the user's mouth and nose.

[0540] <47>

[0541] The heating appliance described in <45> above does not have a pair of ear loops that are installed on the main body and can maintain a state in which the main body covers at least one of the user's mouth and nose.

[0542] The device is configured such that when using the heating appliance, a person can grasp the main body.

[0543] <48>

[0544] As described in any one of <42> to <47> above, the air permeability of the front sheet, as measured according to JIS P8117, is preferably 0.01 seconds / 100mL or more, more preferably 0.03 seconds / 100mL or more.

[0545] The air permeability of the back sheet, as measured according to JIS P8117, is preferably 0.01 seconds / 100 mL or more, and more preferably 0.03 seconds / 100 mL or more.

[0546] <49>

[0547] As described in any one of <42> to <48> above, the basis weight of the front sheet is preferably 10 g / m². 2 The above, preferably 30g / m 2 The above, and even more preferably 50g / m 2 above,

[0548] The preferred basis weight of the front sheet is 200 g / m². 2 The following is more preferably 130g / m 2 The following is a further preferred value: 100g / m 2 the following.

[0549] <50>

[0550] In any of the heating appliances described in <42> to <49> above, the basis weight of the back sheet is preferably less than the basis weight of the front sheet.

[0551] The basis weight of the back sheet is preferably 10 g / m². 2 The above is further preferred to be 20g / m 2 above,

[0552] The basis weight of the back sheet is preferably 100 g / m². 2 The following is a further preferred value: 80g / m 2 the following.

[0553] <51>

[0554] The heating appliance as described in any one of <42> to <50> above, wherein the heating element is preferably held between the front sheet and the back sheet in a state of being housed within a breathable packaging material.

[0555] <52>

[0556] As described in <51> above, in the heated appliance, the packaging material is preferably composed of a first sheet with breathable properties forming one surface.

[0557] The packaging material is preferably composed of a second sheet with lower air permeability than the first sheet, forming the other side.

[0558] The first sheet is preferably configured opposite to the front sheet.

[0559] The second sheet is preferably configured opposite to the back sheet.

[0560] <53>

[0561] The heating appliance as described in any one of <11>, <12>, and <52> above, wherein the air permeability of the first sheet, as measured according to JIS P8117, is preferably 20 seconds / 100mL or more, more preferably 30 seconds / 100mL or more, and even more preferably 40 seconds / 100mL or more.

[0562] <54>

[0563] The heating appliance as described in any one of <11>, <12>, <52>, and <53> above, wherein the air permeability of the first sheet, as measured according to JISP8117, is preferably 25,000 seconds / 100mL or less, more preferably 15,000 seconds / 100mL or less, and even more preferably 10,000 seconds / 100mL or less.

[0564] <55>

[0565] The heating appliance as described in any one of <11>, <12>, <52> to <54> above, wherein the air permeability of the second sheet, as measured according to JISP8117, is preferably 10,000 seconds / 100mL or more, more preferably 25,000 seconds / 100mL or more, and even more preferably airtight.

[0566] <56>

[0567] As described in any one of <11>, <12>, <52> to <55> above, the moisture permeability of the first sheet material, as measured according to JIS Z0208, is preferably 480 g / (m³). 2 • 24h or more, more preferably 720g / (m 2 ·24h) or more, further preferably 960g / (m2 ·24h) or more.

[0568] <57>

[0569] As described in any one of <11>, <12>, <52> to <56> above, the moisture permeability of the first sheet material, as measured according to JIS Z0208, is preferably 5000 g / (m²). 2 ·24h or less, more preferably 4750g / (m 2 ·24h or less, further preferably 4500g / (m 2 ·24h and below.

[0570] <58>

[0571] As described in any one of <11>, <12>, <52> to <57> above, the moisture permeability of the second sheet, as measured according to JIS Z0208, is preferably 480 g / (m³). 2 ·24h) or less, more preferably 240g / (m 2 ·24h or less, further preferably 0g / (m 2 •24h).

[0572] <59>

[0573] The heating appliance as described in any one of <1> to <58> above, wherein it has the function of generating steam along with heating.

[0574] <60>

[0575] Use of any of the above-mentioned heating appliances (1) to (59) as eye masks.

[0576] <61>

[0577] Use of a heating appliance as described in any one of <1> to <59> above, which is configured as an adhesive form.

[0578] <62>

[0579] Use of any of the above-mentioned heating appliances (1) to (59) as a face mask.

[0580] <63>

[0581] The use of any one of the above-mentioned <1> to <59> as a cup.

[0582] Example

[0583] The present invention will now be described in more detail through embodiments. However, the scope of the present invention is not limited to these embodiments. In the tables, empty columns indicate "does not contain".

[0584] [Examples 1-6 and Comparative Example 1]

[0585] <Preparation of Coatings>

[0586] Iron powder (manufactured by DOWA IP CREATION Co., Ltd., RKH3, particle size: 45 μm) was used as the powder of the easily oxidizable metal, activated carbon powder (manufactured by Osaka Gas Chemicals Co., Ltd., Carboraffin, particle size: 31 μm) was used as the powder of the carbon material, and calcium silicate powder was used as the powder of the porous material 3c, which is a calcium silicate compound (manufactured by Tomita Pharmaceutical Co., Ltd., product name: Florite R, particle size: 47 μm, pore diameter D1: 0.18 μm). These raw materials were mixed with water, electrolyte and thickener in the proportions shown in Table 1 below to obtain a slurry of the exothermic composition with a viscosity of 5000 mPa·s at 25°C as measured by a type B viscometer.

[0587] <Making of the heating element>

[0588] The particles of the water-absorbing resin (Aqualic (registered trademark) CA, manufactured by Nippon Shokubai Co., Ltd.) were prepared at a basis weight of 50 g / m³. 2 It is distributed in layers in the paper made of wood pulp (basic weight 20 g / m³) which serves as the first moisture-permeable sheet. 2 (Manufactured by Ino Paper Co., Ltd.) A paper made of wood pulp (basis weight 30g / m³) is laminated on top of a layer of absorbent resin as a second moisture-permeable sheet. 2 (Manufactured by Ino Paper Co., Ltd.), thereby obtaining a sheet with a water-absorbing resin layer.

[0589] Using a sheet of polyethylene laminated paper (manufactured by Nittoku) as the substrate, the above-mentioned slurry was coated onto one side of the sheet by means of a die-coating method while adjusting the ejection pressure, to obtain a sheet-like coated product. The ejection pressure was adjusted such that the basis weight of the slurry was as shown in Table 1.

[0590] Subsequently, 0.064g of salt (manufactured by Otsuka Pharmaceutical Co., Ltd., Pharmacopoeia Sodium Chloride) was evenly distributed on the slurry side. Then, a water-absorbing resin sheet was laminated onto the slurry side to obtain a laminate precursor. The obtained laminate precursor was then cut into 49mm × 49mm pieces to obtain a laminate in which a water-absorbing resin layer is disposed on the heating composition side of the coated heating element.

[0591] Next, a laminate is formed by sandwiching a breathable first sheet (breathability: 1500 seconds / 100mL) cut into 63mm x 63mm pieces with an impermeable second sheet, and then heat-sealing the edges of these sheets to obtain a heating element housed within the packaging material. This configuration is as follows: Figure 2 The structure illustrated in (a).

[0592] The first sheet in the packaging material is configured such that its inner surface faces the outer surface of the absorbent resin layer sheet. The second sheet in the packaging material is configured such that its inner surface faces the surface of the substrate sheet.

[0593] Finally, the heating element housed in the packaging material is kept within a needle-punched nonwoven fabric (basis weight 80 g / m²). 2 The front sheet is composed of hot-air nonwoven fabric (basis weight 30g / m²). 2 The back sheets are joined together in a manner that produces a product with... Figures 4 to 7 The structure shown in the example is an eye mask-type heating appliance.

[0594] The front sheet is arranged with its inner surface facing the outer surface of the first sheet in the packaging material. The back sheet is arranged with its inner surface facing the outer surface of the second sheet in the packaging material. This heating appliance is formed to generate steam in conjunction with heating.

[0595] [Examples 7 and 8]

[0596] Except for using calcium silicate powder different from that used in Example 1 as the powder of porous material, a heating element and a water-absorbing resin layer with the same structure as in Example 1, and an eye mask-type heating appliance containing these are manufactured.

[0597] The calcium silicate powder used in Example 7 is calcareous silicate (manufactured by JAPANINSULATION CO., LTD., product name: calcareous silicate, particle size: 24 μm, pore diameter D1: 0.62 μm), which is a calcareous silicate compound. The calcium silicate powder used in Example 8 is calcareous silicate (manufactured by JAPANINSULATION CO., LTD., product name: calcareous silicate, particle size: 47 μm, pore diameter D1: 0.46 μm), which is a wollastonite compound.

[0598] [Examples 9-11 and Comparative Example 2]

[0599] As shown in Table 1 below, the contents of water, easily oxidizable metals and porous materials in the heating element were changed respectively. Otherwise, the heating element, the water-absorbing resin layer and the heating appliance were obtained in the same manner as in Example 1.

[0600] [Examples 12-13 and Comparative Example 3]

[0601] As shown in Table 1 below, the contents of water, easily oxidizable metals, and porous materials in the heating element were changed respectively.

[0602] In addition, the first sheet constituting the air permeability of the packaging material will be changed to a sheet with an air permeability of 60 seconds / 100mL or a sheet with an air permeability of 4000 seconds / 100mL.

[0603] The first sheet in the packaging material is configured such that its inner surface faces the absorbent resin layer. The second sheet in the packaging material is configured such that its inner surface faces the substrate sheet.

[0604] The front sheet is arranged such that its inner surface faces the outer surface of the first sheet in the packaging material. The back sheet is arranged such that its inner surface faces the outer surface of the second sheet in the packaging material.

[0605] In addition, the heating element and the water-absorbing resin layer, as well as the heating appliance, are obtained in the same manner as in Example 1.

[0606] [Example 14 and Comparative Example 4]

[0607] In addition to the easily oxidizable metal, carbon material, porous material and water used in Example 1, a mixture of pulp fibers (sulfate softwood pulp, manufactured by Skeena Co., Ltd., trade name "Skeena", average fiber length: 2.1 mm) as fiber material was used to form paper, and an intermediate forming body was formed. Then, the intermediate forming body was made to contain electrolyte to form a paper-forming type heating element with the raw material ratios shown in Table 1 below.

[0608] Then, using a sheet with an air permeability of 2500 seconds / 100mL as the air permeability sheet constituting the packaging material, a heated appliance was formed by the same method as in Example 1.

[0609] This constitutes Figure 1 The structure illustrated in (b).

[0610] [Example 15 and Comparative Example 5]

[0611] Crepe paper (manufactured by Daishowa Paper Industry Co., Ltd.) was used as the first moisture-permeable sheet.

[0612] Using a sheet of polyethylene laminated paper (manufactured by Nittoku) as the substrate, the above-mentioned slurry was coated onto one side of the sheet by means of a die-coating method while adjusting the ejection pressure, to obtain a sheet-like coated product. The ejection pressure was adjusted such that the basis weight of the slurry was as shown in Table 2.

[0613] Subsequently, 0.094g of salt (manufactured by Otsuka Pharmaceutical Co., Ltd., pharmacopoeia sodium chloride) and 0.133g of water-absorbing polymer (sodium polyacrylate, spherical, average particle size 300μm, SANFRESH ST-500D*, manufactured by Sanyo Chemical Industry Co., Ltd.) were uniformly dispersed on the slurry side. Then, crepe paper was laminated onto the slurry side to obtain a laminate precursor. The obtained laminate precursor was then cut into 49mm×49mm pieces to obtain a laminate in which a water-absorbing resin layer is disposed on the heating composition side of the coated heating element.

[0614] Next, a laminate is formed by sandwiching a breathable first sheet (breathability: 60 seconds / 100mL) cut into 63mm x 63mm pieces with an impermeable second sheet, and then heat-sealing the edges of these sheets to obtain a heating element housed within the packaging material. This configuration is as follows: Figure 2 The structure illustrated in (b).

[0615] The first sheet in the packaging material is configured such that its inner surface faces the outer surface of the absorbent resin layer sheet. The second sheet in the packaging material is configured such that its inner surface faces the surface of the substrate sheet.

[0616] [Example 16 and Comparative Example 6]

[0617] The particles of the water-absorbing resin (Aqualic (registered trademark) CA, manufactured by Nippon Shokubai Co., Ltd.) were prepared at a basis weight of 50 g / m³. 2 It is distributed in layers in the paper made of wood pulp (basic weight 20 g / m³) which serves as the first moisture-permeable sheet. 2 (Manufactured by Ino Paper Co., Ltd.) A paper made of wood pulp (basis weight 30g / m³) is laminated on top of a layer of absorbent resin as a second moisture-permeable sheet. 2 (Manufactured by Ino Paper Co., Ltd.) to obtain sheets with a water-absorbing resin layer.

[0618] Using a sheet of polyethylene laminated paper (manufactured by Nittoku) as the substrate, the above-mentioned slurry was coated onto one side of the sheet by means of a die-coating method while adjusting the ejection pressure, to obtain a sheet-like coated product. The ejection pressure was adjusted such that the basis weight of the slurry was as shown in Table 2.

[0619] Subsequently, 0.169g of salt (manufactured by Otsuka Pharmaceutical Co., Ltd., pharmacopoeia sodium chloride) and 0.141g of water-absorbing polymer (sodium polyacrylate, spherical, average particle size 300μm, SANFRESH ST-500D*, manufactured by Sanyo Chemical Industry Co., Ltd.) were uniformly dispersed on the slurry side. Then, water-absorbing resin sheets were laminated onto the slurry side to obtain a laminate precursor. The obtained laminate precursor was then cut into 49mm×49mm pieces to obtain a laminate in which a water-absorbing resin layer is disposed on the heating composition side of the coated heating element.

[0620] Next, a laminate is formed by sandwiching a breathable first sheet (breathability: 60 seconds / 100mL) cut into 63mm x 63mm pieces with an impermeable second sheet, and then heat-sealing the edges of these sheets to obtain a heating element housed within the packaging material. This configuration is as follows: Figure 2 The configuration illustrated in (c).

[0621] The first sheet in the packaging material is configured such that its inner surface faces the outer surface of the absorbent resin layer sheet. The second sheet in the packaging material is configured such that its inner surface faces the surface of the substrate sheet.

[0622] [Determination of sensible heat accumulation]

[0623] The cumulative sensible heat in the heating appliances of the examples and comparative examples was measured in accordance with the following method at a room temperature of 20°C and a humidity of 50%RH.

[0624] First, a heating device for the test object is made and sealed inside an oxygen-barrier bag. The oxygen-barrier bag is then opened, and a heating element and packaging material are removed from the heating device.

[0625] Then, the packaging material of the removed heating element is arranged with the first sheet side facing outwards, and a temperature sensor is placed and fixed on the area where the heating element is located on the second sheet side. The temperature sensor is fixed to the measuring surface by a mesh (polyester, 8 mm thick double-sided Raschel fabric) and an SUS plate (500 g perforated plate).

[0626] Then, with the temperature sensor connected, the temperature over time was measured using the measuring machine described in JIS S4100. The measurement started at the moment the oxygen-barrier bag was opened, and the temperature was measured at 10-second intervals for a total of 10 minutes or 20 minutes.

[0627] Based on the heating curve plotted with the vertical axis set to the measured temperature (°C) and the horizontal axis set to the measured time (seconds), the integral value of the temperature obtained by subtracting 35°C from the measured temperature during the time it takes to reach a temperature above 35°C is calculated and used as the cumulative sensible heat (°C·10min or °C·20min). The results are shown in Tables 1 and 2 below.

[0628] [Determination of water vapor production]

[0629] The amount of water vapor generated in the heating appliances of the examples and comparative examples was measured according to the following method. Specifically, using... Figure 12 The apparatus 100 shown is used for measurement.

[0630] First, the heating device containing the test object, which is sealed inside an oxygen-barrier bag, is used as the test object. The oxygen-barrier bag is opened, and then one heating element and the packaging material are removed from the heating device.

[0631] The heating element is placed in the measuring chamber 101 with the first sheet of its packaging material facing outwards, and a weight 108 with a metal ball (mass 4.5g) is placed on top of it. In this state, dehumidified air is circulated from the lower part of the measuring chamber 101, and the difference in absolute humidity before and after air circulation in the measuring chamber 101 is calculated using the inlet temperature and humidity meter 104 and the outlet temperature and humidity meter 106. Furthermore, the amount of water vapor emitted from the heating element is calculated using the air flow rate measured by the inlet flow meter 105 and the outlet flow meter 107.

[0632] The amount of water vapor generated was defined as the time point at which the heated appliance was removed from the oxygen-barrier bag. The total amount of water vapor (mg·10min) was measured at 10 minutes and at 20 minutes from that time point. The results are shown in Tables 1 and 2 below.

[0633] [Table 1]

[0634]

[0635] [Table 2]

[0636]

[0637] As shown in Tables 1 and 2, it can be seen that the heating appliances of each embodiment, by incorporating a powder containing porous material and having a heating element with a specific relationship between one or more of the following ratios: the content of easily oxidizable metal to water, the content of easily oxidizable metal to porous material, and the content of water to porous material, exhibit higher sensible heat accumulation and superior heating characteristics compared to the heating appliances of the comparative examples, even though the content of easily oxidizable metal is the same. Furthermore, it can be seen that this also significantly increases the amount of water vapor generated. Moreover, it can be seen that when the heating element is housed in packaging material, regardless of the fiber sheet used, both the heating characteristics and the amount of water vapor generated are excellent.

[0638] Therefore, it can be seen that the heating appliance of the present invention can produce a heating appliance with excellent heating characteristics at a low cost, even without increasing the content of easily oxidizable metals with higher costs.

[0639] Industrial availability

[0640] This invention provides a heating appliance that minimizes manufacturing costs and offers excellent heating characteristics and steam generation.

Claims

1. A heating appliance, wherein, It includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material. The heating element is a sheet-like material. In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred is 100×(water / easily oxidizable metal powder) = 30 or more and 270 or less.

2. A heating appliance, wherein, It includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material. The heating element is a sheet-like material. In the heating element, the value obtained by multiplying the mass content of the porous material powder to the mass content of the easily oxidizable metal powder by one hundred is 100×(powder of porous material / powder of easily oxidizable metal) = 1 to 25.

3. A heating appliance, wherein, It includes a heating element comprising powder of an easily oxidizable metal, powder of a carbon material, water, and powder of a porous material other than the easily oxidizable metal and the carbon material. The heating element is a sheet-like material. In the heating element, the value obtained by multiplying the mass content of the porous material powder relative to the mass content of water by one hundred is 100×(porous material powder / water) = 1 to 30.

4. The heating appliance as described in any one of claims 1 to 3, wherein, The heating element is housed within a breathable packaging material. A layer containing powdered water-absorbing resin is disposed between the heating element and the packaging material.

5. The heating appliance as described in claim 4, wherein, The powder of the water-absorbing resin is sandwiched between two breathable sheets to form the layer.

6. The heating appliance as described in any one of claims 1 to 5, wherein, The heating element is a sheet-like object composed of a substrate sheet and a layer of heating composition disposed on one side thereof. In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred is 100 × (water / easily oxidizable metal powder) = 80 to 270. The layer of the heating composition is obtained from a slurry containing powder of the easily oxidizable metal, powder of the carbon material, powder of the porous material, and water.

7. The heating appliance as described in any one of claims 1 to 5, wherein, The heating element is a sheet-like material formed by mixing the powder of the easily oxidizable metal, the powder of the carbon material, the powder of the porous material, water, and fibrous material. In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred is 100×(water / easily oxidizable metal powder) = 30 or more and 80 or less.

8. The heating appliance as described in any one of claims 1 to 6, wherein, The heating element is composed of a substrate sheet and a layer of heating composition disposed on one side thereof. The layer of the heating composition is obtained from a slurry comprising the powder of the easily oxidizable metal, the powder of the carbon material, the powder of the porous material, and water. The heating appliance further comprises a layer containing powder of a water-absorbing resin. The heating composition is disposed between the substrate sheet and the layer containing the water-absorbing resin powder.

9. The heating appliance as described in any one of claims 1 to 8, wherein, The porous material has a pore diameter of 0.01 μm to 5 μm.

10. The heating appliance as described in any one of claims 1 to 9, wherein, The porous material contains silicon-containing inorganic compounds.

11. The heating appliance as claimed in claim 10, wherein, The porous material is composed of calcium silicate.

12. The heating appliance as claimed in claim 11, wherein, The pore diameter of the calcium silicate is between 0.02 μm and 0.8 μm.

13. The heating appliance as described in any one of claims 1 to 12, wherein, The heating appliance includes: a main body having a shape that covers the user's eyes when in use; a heating element disposed on the main body; and a pair of ear loops mounted on the main body and capable of maintaining the state of covering the user's eyes generated by the main body. The main body includes a front sheet located close to the user's skin and a back sheet located away from the user's skin. The heating element is held between the front sheet and the back sheet.

14. The heating appliance as described in any one of claims 1 to 13, wherein, It has the function of generating steam along with heat.

15. A heating appliance, wherein, It has a heating element, which comprises powder of an easily oxidizable metal, powder of carbon material, water, and calcium silicate. The heating element is a sheet-like material. In the heating element, the value obtained by multiplying the ratio of the mass content of water to the mass content of the easily oxidizable metal powder by one hundred is 100×(water / easily oxidizable metal powder) = 30 or more and 270 or less.

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