Heating device

Abstract

To provide a new heating tool capable of exhibiting desired heating characteristics.SOLUTION: The heating tool includes a storage bag 5 that stores a mixture containing an oxidizable metal powder, an oxidation accelerator, and a water retention agent, and a water-containing body 6, wherein at least a part of the storage bag on the side in contact with the water-containing body has water permeability, and the water-containing body releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture from the time when the storage bag and the water-containing body are brought into contact with each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a heating tool. [Background technology]

[0002] Disposable hand warmers are known as body warmers. Disposable hand warmers typically contain an exothermic composition that generates heat in the presence of air (oxygen), and this heat-generating principle is what provides the warming effect. For this reason, the exothermic composition is stored in a non-breathable outer bag to prevent contact with air until use. At the time of use, the exothermic composition can be easily generated by simply removing it from the outer bag. Furthermore, adhesive-type disposable hand warmers, such as those described in Patent Document 1, are easy to use because they can be applied to the desired location for warmth. Disposable hand warmers are widely used because of their simple usage procedure, portability and safety as a warming device, and low cost.

[0003] However, in such disposable hand warmers, for example, if the exothermic composition is manufactured in the presence of oxygen, the components constituting the exothermic composition may react with each other during manufacturing, or the components constituting the exothermic composition may gradually react with each other even when stored in an air-impermeable outer bag. This causes a decrease in heat generation characteristics, such as difficulty in generating heat to the desired temperature during use and uneven heat generation. To address these problems, measures have been taken, for example, by improving the air-impermeable outer bag to further block contact between the exothermic composition and air. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-80018 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a new heating tool that can exhibit desired heating characteristics. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above-mentioned problems and have found that desired heat-generating properties, such as heat generation temperature, can be achieved by placing a mixture containing an oxidizable metal powder, an oxidation promoter, and a water-retaining agent in a water-permeable storage bag, separately preparing a water-containing body, bringing the storage bag into contact with the water-containing body, and releasing water from the water-containing body at a ratio of 10 to 210 parts by mass of water per 100 parts by mass of the mixture.The present invention was completed based on this finding and through further research.That is, the present invention provides the following inventions.

[0007] Item 1. A storage bag containing a mixture containing an oxidizable metal powder, an oxidation promoter, and a water-retaining agent, and a water-containing body, At least a part of the side of the storage bag that comes into contact with the water-containing body is water-permeable, The heating tool releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture from the moment the water-containing body comes into contact with the storage bag. Item 2. The heating tool according to Item 1, wherein the water-containing body is a sheet that releases water by compressive deformation. Item 3. The heating tool according to Item 1 or 2, wherein the water-containing body is pressurized at 1800 Pa or more from the time it comes into contact with the storage bag. Item 4. The heating tool according to any one of Items 1 to 3, wherein the mixture absorbs 10 to 210 parts by mass of water per 100 parts by mass of the mixture from the time the containing bag is brought into contact with the water-containing body. Item 5. The heating tool according to any one of Items 1 to 4, wherein the water content of the mixture is 5% by mass or less. Item 6. The heating tool according to any one of Items 1 to 5, further comprising a container for containing the water-containing body, for bringing the water-containing body into contact with the container bag. [Effects of the Invention]

[0008] According to the present invention, a new heating tool can be provided that can exhibit desired heat generation characteristics (heat generation temperature, heat generation duration and / or heat generation start time). [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 shows an example of the present heating tool that includes a storage bag that stores a mixing part, a water-containing body, a storage part for the water-containing body, and a carrier. [Figure 2] FIG. 2 shows an example of the present heating tool that includes a storage bag that stores a mixing part, a water-containing body, a storage part for the water-containing body, and a carrier. [Figure 3] FIG. 3 shows an example of a schematic cross-sectional view of the heating tool shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention relates to a heating tool comprising a storage bag containing a mixture including an oxidizable metal powder, an oxidation promoter, and a water-retaining agent, and a water-containing body, wherein at least a portion of the side of the storage bag that comes into contact with the water-containing body is water-permeable, and the water-containing body releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture when the storage bag and the water-containing body are brought into contact with each other.

[0011] mixture In this heating tool, the mixture contains an oxidizable metal powder, an oxidation promoter, and a water-retaining agent.

[0012] ·Oxidizable metal powder The oxidizable metal powder is not limited as long as it is a metal powder that generates heat when oxidized, and examples thereof include iron powder, zinc powder, aluminum powder, magnesium powder, and copper powder, with iron powder being preferred. Examples of iron powder include reduced iron powder, cast iron powder, atomized iron powder, and electrolytic iron powder. The shape of the oxidizable metal powder is also not limited, and examples include powder forms such as powder, granules, and fibers that are commonly used in conventional disposable body warmers. These may be used alone or in combination of two or more.

[0013] The content of the oxidizable metal powder is not limited, but the oxidizable metal powder is, for example, 20 to 80 mass %, preferably 25 to 70 mass %, more preferably 30 to 65 mass % in the mixture.

[0014] Pro-oxidant The pro-oxidant is used for the purpose of promoting the supply of oxygen to the mixture, particularly to the oxidizable metal powder, by taking in air. Examples of pro-oxidants include, but are not limited to, activated carbon, coal, charcoal, bamboo charcoal, graphite, carbon black, graphite, acetylene black, and coffee grounds charcoal. Preferred examples include activated carbon, carbon black, bamboo charcoal, charcoal, and coffee grounds charcoal. The shape of the pro-oxidant is also not limited, and examples include the powder, granules, and fibers used in conventional disposable body warmers. These may be used alone or in combination of two or more.

[0015] The content of the pro-oxidant is not limited, but the pro-oxidant content in the mixture is, for example, 1 to 30 mass %, preferably 3 to 25 mass %, more preferably 5 to 23 mass %.

[0016] ·Water retention agent The water-retaining agent is not limited to the present invention, but examples thereof include porous materials and water-absorbent resins. More specifically, the water-retaining agent is not limited to the present invention, but examples thereof include vermiculite. Examples of the inorganic filler include natural or synthetic inorganic substances such as perlite, calcium silicate, aluminum silicate, kaolin, talc, smectite, mica, bentonite, calcium carbonate, silica gel, alumina, zeolite, silicon dioxide, and diatomaceous earth; and natural or synthetic organic substances such as pulp, wood flour (sawdust), cotton, polyacrylate resins, polysulfonate resins, maleic anhydride resins, polyacrylamide resins, polyvinyl alcohol resins, polyethylene oxide resins, polyaspartate resins, polyglutamate resins, polyalginate resins, starches, and celluloses.

[0017] Preferred examples of water-retaining agents include vermiculite, perlite, silica gel, diatomaceous earth, aluminum oxide, wood flour (sawdust), and polyacrylate resins. Furthermore, more preferred examples of water-retaining agents include polyacrylate resins, particularly sodium polyacrylate. Preferred examples of polyacrylate resins include polyacrylate resins with a water-absorption rate of 10 seconds or more, preferably sodium polyacrylate with a water-absorption rate of 10 seconds or more, and more preferably sodium polyacrylate with a water-absorption rate of 20 seconds or more. While not limited thereto, preferred examples of water-absorption rates are 10 to 90 seconds, more preferably 20 to 60 seconds. Here, the water-absorption rate is measured according to JIS K7224 (1996). In the present invention, a polyacrylate resin with a water-absorption rate of 10 seconds or more refers to the time it takes for 2 g of polyacrylate resin to absorb 50 g of physiological saline. The shape of the water-retaining agent is also not limited, and examples include the shapes used in conventional disposable body warmers.

[0018] These may be used alone or in combination of two or more.

[0019] The content of the water retention agent is not limited, but the water retention agent may be present in an amount of 1 to 65 mass %, preferably 5 to 60 mass %, and more preferably 10 to 60 mass % in the mixture.

[0020] The mixture may further contain any other component as necessary, provided that the effects of the present invention are not impaired. Examples of such other components include, but are not limited to, water-soluble salts, water, hydrogen generation inhibitors, thickeners, excipients, surfactants, sequestering agents, and various useful components such as fragrances, warming components, anti-fatigue components, analgesic components, anti-inflammatory components, blood circulation promoting components, cooling (cooling, refreshing) components, and repellent components. The other components may be appropriately selected and used depending on the purpose, and may be used alone or in combination of two or more, and the amounts of the other components may also be appropriately selected.

[0021] Although not limiting the present invention, examples of other components include water-soluble salts. Examples of water-soluble salts include, but are not limited to, chloride salts and sulfide salts of alkali metals such as sodium and potassium, chloride salts and sulfide salts of alkaline earth metals such as calcium and magnesium, and chloride salts and sulfide salts of metals such as iron, copper, aluminum, zinc, nickel, silver, and barium. Preferred examples of water-soluble salts include sodium chloride and potassium chloride. These salts may be used alone or in combination of two or more. When the mixture contains water-soluble salts, their content is not limited as long as the effects of the present invention are obtained. However, the content of the water-soluble salts in the mixture is, for example, 0.1 to 10% by mass, preferably 0.5 to 7% by mass, and more preferably 1 to 5% by mass.

[0022] Although not limiting the present invention, examples of water as another component include distilled water, tap water, ion-exchanged water, pure water, ultrapure water, industrial water, etc. The content of water is also not limited as long as it does not impair the effects of the present invention, and is exemplified as 0 to 5% by mass (5% by mass or less) in the mixture.

[0023] Furthermore, although not limiting the present invention, useful ingredients such as fragrances may be used as other ingredients. In this case, from the viewpoint of more effectively exerting the beneficial effects of the useful ingredients due to the heat generated in the heating tool, it is more preferable that the useful ingredients be ingredients that can volatilize their beneficial effects at the temperature at which the mixture generates heat in the presence of oxygen (for example, about 38 to 85°C).

[0024] As mentioned above, conventional disposable hand warmers that use an exothermic composition that generates heat in the presence of air (oxygen) are stored in a water-impermeable outer bag to prevent contact with air until use, and generate heat to the desired temperature simply by removing the exothermic composition from the outer bag at the time of use. Unlike conventional heating tools that generate heat to the desired temperature simply by removing the exothermic composition from the outer bag at the time of use, this heating tool exhibits the desired heat-generating properties when a predetermined amount of water released from a water-containing body described below is supplied to the mixture.

[0025] The mixture can be produced by mixing an oxidizable metal powder, an oxidation promoter, a water-retaining agent, and, if necessary, the other ingredients. The mixture may be prepared in the presence of oxygen, or may be prepared under vacuum or an inert gas atmosphere, and can be produced according to a conventionally known manufacturing procedure for a heating tool. In particular, since this heating tool does not generate heat simply by removing the storage bag containing the mixture from the outer bag and contacting it with oxygen when in use, the mixture may be prepared in the presence of air (oxygen).

[0026] The mixture thus obtained is placed in a storage bag described below, whereby a storage bag containing the mixture can be obtained.

[0027] In the present heating tool, the mixture is not limited in this respect, but in order to more efficiently exhibit the desired heat generation characteristics (heat generation temperature, heat generation duration, and / or heat generation onset), a preferred example of the mixture is a mixture that absorbs water supplied from a water-containing body described below at room temperature (about 15 to 25°C) in an amount of 10 to 210 parts by mass per 100 parts by mass of the mixture. Furthermore, the mixture is not limited in this respect, but a more preferred example is a mixture that absorbs 10 to 180 parts by mass of water, and even more preferred is a mixture that absorbs 60 to 115 parts by mass of water, per 100 parts by mass of the mixture.

[0028] Furthermore, in this heating tool, the mixture is not limited to this, but in order to more efficiently exhibit the desired heat-generating properties, the mixture is preferably adapted to absorb 10 to 210 parts by mass of water per 100 parts by mass of the mixture within 60 seconds from the start of water supply to the mixture upon contact of the storage bag containing the mixture with the water-containing body at room temperature (approximately 15 to 25°C), more preferably 10 to 180 parts by mass of water, and particularly preferably 60 to 115 parts by mass of water.

[0029] In order to exhibit the desired heat-generating properties during heat generation, it is preferable for the mixture to absorb a predetermined amount of water. Furthermore, in order to exhibit the desired heat-generating properties more efficiently, it is more preferable for the mixture to absorb a predetermined amount of water within a predetermined time after water is supplied. If the amount of water absorbed is too much or too little, heat generation becomes difficult. Furthermore, even with the same amount of water, if the absorption rate is too fast or too slow, efficient heat generation becomes difficult. From this perspective, it is preferable for the mixture to absorb the aforementioned water within 60 seconds from the time the storage bag is brought into contact with the water-containing body as described above.

[0030] Here, the amount of water absorbed by the mixture is calculated by measuring the weight of the hydrated body (weight A) before contacting the storage bag, and measuring the weight of the hydrated body after contacting the storage bag (weight B), and subtracting the latter weight (weight B) from the former weight (weight A).

[0031] In addition, the ratio of 10 to 210 parts by mass of water per 100 parts by mass of the mixture is calculated by subtracting weight B from weight A, dividing the result by the weight of the mixture contained in the storage bag (before contact with the water-containing body), and multiplying the result by 100. It is calculated using the following formula:

[0032] Water absorption rate per 100 parts by mass of mixture = ((Weight A) - (Weight B)) x 100 / Weight of the mixture contained in the storage bag

[0033] A preferred example of the mixture is a mixture that satisfies the above value, where weight B is the weight of the water-containing body measured 60 seconds after the start of supplying water to the mixture by contacting the storage bag with the water-containing body.

[0034] An example of the mixture, although not limiting the present invention, is a mixture containing 20 to 70 mass% of oxidizable metal powder, 5 to 20 mass% of a pro-oxidant, 10 to 35 mass% of a water-retaining agent, and 0 to 10 mass% of a water-soluble salt. Another example of the mixture, although not limiting the present invention, is preferably a mixture containing 40 to 60 mass% of oxidizable metal powder, 5 to 20 mass% of a pro-oxidant, 15 to 35 mass% of a water-retaining agent, and 0 to 5 mass% of a water-soluble salt. Another example of the mixture, although not limiting the present invention, is preferably a mixture containing 0 to 5 mass% water.

[0035] The amount of the mixture contained in the storage bag is not limited as long as the effects of the present invention can be obtained, and may be appropriately determined based on the size and shape of the storage bag, the purpose of use of the heating tool, the target of application, etc., with reference to conventionally known disposable body warmers, etc. Although not limiting the present invention, an example of the amount of the mixture contained in one storage bag is 4 to 20 g, preferably 8 to 16 g.

[0036] Furthermore, the desired heat generation characteristics of the present heating tool may be determined appropriately depending on the intended use and application of the heating tool, and are not intended to limit the present invention. Examples of the desired heat generation characteristics include a maximum heat generation temperature of the mixture of approximately 38 to 85°C, preferably approximately 40 to 70°C. The present heating tool is not limited in this respect, but examples of the duration of the heat generation temperature of the mixture exceeding 40°C include 10 minutes or more, more preferably 30 minutes or more. The present heating tool is not limited in this respect, but examples of the time it takes for the mixture to reach a heat generation temperature exceeding 40°C (rise time) include 12 minutes or less, more preferably 7 minutes or less, from the time water is added to the mixture. The present heating tool is only required to exhibit the desired heat generation characteristics in at least one of the maximum heat generation temperature, duration, and rise time, and preferably exhibits the desired heat generation characteristics in two, and more preferably three, of these.

[0037] These temperatures and times are determined according to measurements based on JIS S4100 (2007). Specifically, as described in the Examples below, these temperatures and times are determined by measuring the exothermic temperature and time by attaching a temperature sensor with tape to the surface of a storage bag containing the mixture opposite to the surface that comes into contact with the water-containing material, then contacting the storage bag (the other surface not having the temperature sensor attached) with the water-containing material, then placing the storage bag on a wire rack with the opposite surface (the surface with the temperature sensor attached) facing downward, and measuring the temperature at room temperature (about 15 to 25°C). In the Examples below, a temperature sensor that can also measure time is used, and therefore the time can be measured accordingly.

[0038] a storage bag for storing the mixture The mixture is contained in a containing bag, at least a portion of which is water-permeable. Any conventionally known bag can be used as the containing bag, as long as it can contain the mixture, at least a portion of which is water-permeable, prevents leakage of the mixture, and is durable against heat generation as a heating tool.

[0039] The storage bag is not limited to the present invention, but is typically a flat bag. The bag may have any shape, including angular, triangular, circular, oval, foot-shaped, etc. The mixture is contained in the internal space of the bag.

[0040] In this heating tool, the mixture contained in the storage bag generates heat when water is supplied, so at least a portion of the storage bag is water permeable.

[0041] Examples of the storage bag include, but are not limited to, a storage bag made of a water-permeable resin film, a storage bag made of a water-permeable woven or nonwoven fabric, and a storage bag having a laminated structure in which a water-permeable resin film and a water-permeable woven or nonwoven fabric are laminated together. In the case of a storage bag having such a laminated structure, the water-permeable resin film may be disposed on the inside of the storage bag and the water-permeable woven or nonwoven fabric may be disposed on the outside, or vice versa. Examples of the storage bag include, but are not limited to, water-permeable bags used in conventionally known disposable hand warmers.

[0042] The resin used for the water-permeable resin film is not intended to limit the present invention, but a preferable example is a thermoplastic resin film.

[0043] Examples of thermoplastic resins include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, ethylene-vinyl acetate copolymer, etc., and preferred examples include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc. These may be used alone or in combination of two or more.

[0044] The water-permeable resin film has pores at least partially formed therein to ensure water permeability. The pores formed in the resin film are not limited in size, shape, number, or method of forming the pores, as long as they are large enough to allow water to pass through at least from the outside to the inside of the storage bag and prevent the mixture from leaking out of the storage bag. Means for forming pores in a resin film are also conventionally known and can be carried out according to conventional procedures. The water-permeable resin film may be a conventionally known perforated film, porous film, or the like. The term "porous film" is used in the conventional, general sense, and refers to a porous film having a large number of pores in which multiple pores are connected. The pores may be formed uniformly throughout the entire resin film, or may be formed densely in a portion.

[0045] The thickness of the resin film is not limited as long as it can be used as a storage bag, and is preferably 10 to 2000 μm, and more preferably 10 to 1000 μm, for example.

[0046] Examples of fiber materials for water-permeable woven or nonwoven fabrics include synthetic fibers such as nylon, vinylon, polyester, rayon, acrylic, polyethylene, polypropylene, acetate, polyvinyl chloride, polybutylene terephthalate, and ethylene-vinyl acetate copolymers; natural fibers such as cotton, linen, silk, and paper; and blends of synthetic and natural fibers. From the viewpoint of usability, preferred examples of fiber materials include nylon, polyester, polypropylene, and ethylene-vinyl acetate copolymers, and more preferred examples include nylon, polyester, and ethylene-vinyl acetate copolymers. These may be used alone or in combination of two or more.

[0047] The woven or nonwoven fabric is not limited as long as it can pass water at least from the outside to the inside of the storage bag and can prevent the mixture from leaking out of the storage bag, but the basis weight is preferably 25 to 70 g / m 2 is exemplified.

[0048] The thickness of the nonwoven fabric or woven fabric is not limited as long as the effects of the present invention can be obtained. 000 μm, more preferably 10 to 1000 μm.

[0049] The lamination of the resin film and the woven or nonwoven fabric is not limited as long as the resulting laminate has the strength required for a storage bag and ensures water permeability at least in part. Examples of lamination methods include lamination by thermal bonding, and lamination using an adhesive such as a hot-melt adhesive, an acrylic adhesive, or a urethane adhesive. These laminations may be formed over the entire surface of the storage bag or may be formed only in part, as long as the desired effect is obtained.

[0050] As mentioned above, this heating tool is a heating tool that exhibits the desired heat-generating properties by supplying a predetermined amount of water from a water-containing body and having the water absorbed into the mixture through the water-permeable part of the storage bag.Therefore, it is sufficient for at least a part of the storage bag to have water permeability sufficient to supply the predetermined amount of water released from the water-containing body to the mixture.

[0051] Furthermore, in this heating tool, the mixture contained in the storage bag generates heat upon contact with air (oxygen). For this reason, at least a portion of the storage bag is breathable. In this way, the mixture contained in the storage bag generates heat upon supply of water and contact with air (oxygen). In the storage bag, the water-permeable portion may also serve as the breathable portion, or the water-permeable portion may be provided separately from the breathable portion. Although this does not limit the present invention, from the viewpoint of facilitating contact between the mixture in the storage bag and air (oxygen) while bringing the water-containing body into contact with the water-permeable portion of the storage bag to supply water to the mixture, a preferred example is that the breathable portion is provided in a portion different from the water-permeable portion with which the water-containing body comes into contact.

[0052] Generally, a water-permeable portion can be said to also have breathability, and therefore the breathable portion of the storage bag may be manufactured in the same manner as the water-permeable portion described above. Also, although a water-permeable portion can be said to also have breathability in this way, the breathable portion of the storage bag is not limited as long as it has breathability that allows air (oxygen) to pass through at least from the outside to the inside of the storage bag, and may be manufactured in the same manner as a storage bag that has breathability in at least a portion thereof.

[0053] When the storage bag has a breathable portion in addition to the water-permeable portion, the breathable portion may be made of, but is not limited to, a breathable resin film, a breathable woven or nonwoven fabric, or a laminated structure in which a breathable resin film is laminated with a breathable woven or nonwoven fabric. In the case of a laminated structure, a breathable resin film may be disposed on the inside of the storage bag and a breathable woven or nonwoven fabric may be disposed on the outside, or vice versa. Resin films, woven fabrics, nonwoven fabrics, etc. can be described in the same manner as above, except for their breathability. Examples of such breathable portions include, but are not limited to, resin films, woven fabrics, nonwoven fabrics, etc. that constitute the breathable portions of storage bags used in conventional disposable hand warmers.

[0054] Furthermore, the storage bag is not limited to this, and may have a water-impermeable portion.

[0055] A commercially available bag may be used as the storage bag, and its size is not limited as long as the desired effect can be obtained, and may be appropriately determined depending on the purpose of use of the heating tool, the target of application, etc. Furthermore, the amount of the mixture to be stored in the storage bag may be appropriately determined depending on the size of the storage bag, the purpose of use, the target of application, etc.

[0056] The storage bag is not limited to the present invention, but may be a flat bag, and one side of the storage bag may be In this case, by bringing a water-containing body into contact with the water-permeable portion on one side, water can be supplied from the water-containing body to the mixture in the storage bag, and even if the water-permeable portion is covered with the water-containing body due to this contact and has reduced air permeability or is in an air-impermeable state, air (oxygen) can be supplied to the mixture in the storage bag from the air-permeable portion on the other side, and therefore the mixture can be efficiently heated in the heating tool.

[0057] When the heating tool is used by being attached to clothing, skin, etc., an adhesive sheet may be provided on the outside of the storage bag to secure the heating tool to clothing, skin, etc. with a releasable force. The adhesive sheet may be provided by any means and in any location on the storage bag as long as the desired heating characteristics are obtained. Examples of such adhesive sheets include the adhesive sheets used in conventionally known stick-on disposable warmers, or direct-attachment adhesive sheets.

[0058] water-containing body The heating tool includes a water-containing body that supplies water to the mixture. The water-containing body holds water and releases water upon contact with the storage bag that contains the mixture. In the heating tool, the water released in this manner is supplied to the mixture. More specifically, the water-containing body supplies water to the mixture by contacting at least a water-permeable portion of the outside of the storage bag that contains the mixture and releasing water into the storage bag. The mixture generates heat by absorbing the water thus supplied.

[0059] The water-containing material may be used in contact with the entirety of the storage bag or in contact with only a portion of the storage bag, as long as it is in contact with at least a portion of the water-permeable portion of the storage bag. From the viewpoint of supplying air (oxygen) to the mixture while allowing the mixture to absorb water, it is preferably used in contact with only a portion of the storage bag.

[0060] The water-containing material is not limited as long as it releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture when it is brought into contact with the storage bag at room temperature (about 15 to 25° C.). The water-containing material is not limited in this respect, but an example is one in which it releases more preferably 10 to 180 parts by mass, and even more preferably 60 to 115 parts by mass of water per 100 parts by mass of the mixture.

[0061] The water-containing body is not limited to this, and its size, shape, material, etc. are not limited, and examples thereof include a sheet shape and a bag shape. Water can be carried by any means such as immersion, coating, injection, spraying, etc.

[0062] Although the present invention is not limited thereto, a sheet-shaped hydrous body having a predetermined thickness will be described as an example of the hydrous body. Hydrous bodies other than sheet-shaped hydrous bodies having a predetermined thickness can be understood by those skilled in the art and can be appropriately determined based on the following explanation.

[0063] The sheet-like water-containing body having a predetermined thickness can be formed in any shape, including rectangular, triangular, circular, elliptical, and foot-shaped.

[0064] For example, when the storage bag is a flattened square bag and the water-containing body is brought into contact with one water-permeable surface of the bag, for example, one square sheet of water-containing body may be brought into contact with one surface of the bag, or two triangular sheet of water-containing body arranged in a square shape may be brought into contact with one surface of the bag, or a circular sheet of water-containing body may be brought into contact with one surface of the bag. Here, the entire surface of the one surface may be in contact with the water-containing body, or only a part of the surface of the one surface may be in contact with the water-containing body.

[0065] From the viewpoint of efficient heat generation, the shape of the water-containing body is exemplified by a shape that allows contact in substantially the same shape as the entire shape of the one side. That is, if the one side is, for example, rectangular, the water-containing body is also rectangular; if the one side is, for example, square, the water-containing body is also square; and if the one side is, for example, circular or elliptical, the water-containing body is also circular or elliptical. Here, "substantially the same shape" does not necessarily have to be the same shape in the strict sense, and means that minor differences in shape, such as whether or not corners are chamfered, are acceptable.

[0066] From the viewpoint of efficient heat generation, the shape of the water-containing body is preferably, for example, approximately the same as the shape of the one side, particularly the shape of the heat-generating region of the one side (the portion where the mixture is present in the storage bag on the one side).

[0067] Furthermore, from the viewpoint of efficient heat generation, the size of the water-containing body is, for example, approximately the same as the size of one side, particularly the size of the heat-generating region of one side (the portion of the storage bag on one side where the mixture is present). Here, "approximately the same" means that the size of one side (particularly the heat-generating region) and the size of the water-containing body are exactly the same, and also means that one side is slightly larger than the other. Having these sizes be approximately the same has the advantage of facilitating uniform release of water from the water-containing body to the entire mixture stored in the storage bag, and of almost no release of water other than to the mixture. Furthermore, covering the heat-generating region of the storage bag with the water-containing body prevents the heat-generating region of the storage bag from coming into direct contact with the application site when the heating tool is applied to the skin, etc., thereby having the advantage of reducing the risk of low-temperature burns.

[0068] The size of the hydrous body is not limited to this and may be determined appropriately, but from the viewpoint of ease of use, it is preferably 4 to 14 cm in the horizontal direction and 2 to 10 cm in the vertical direction, and more preferably 7 to 11 cm in the horizontal direction and 3 to 6 cm in the vertical direction. In terms of area, it is preferably 8 to 98 cm. 2 is exemplified, and more preferably 25 to 55 cm 2 is exemplified.

[0069] The thickness of the hydrous body is not limited to this and may be determined appropriately, but from the viewpoint of ease of use, it is preferably 0.5 to 5 mm, more preferably 2 to 4 mm, for example.

[0070] The material of the water-containing body is not particularly limited as long as it can retain water and release water into the storage bag in contact with it, thereby supplying water to the mixture in the storage bag.

[0071] The hydrous body can be formed, for example, from a woven or nonwoven fabric using various fiber materials, preferably hydrophilic fibers or blended fibers of hydrophilic fibers and synthetic fibers. The fiber material is not particularly limited, but preferred examples include polyethylene, polypropylene, polyester, rayon, cotton, and pulp, with pulp being a suitable example from the viewpoint of flexibility and water retention. The method for producing the hydrous body made of a fiber material is not particularly limited, but preferred examples include the airlaid method.

[0072] From the viewpoints of productivity, processability, and durability, the water-containing body is preferably formed by blending pulp, which is the main component, with heat-fusible fibers such as polyethylene in a predetermined ratio. The blending ratio of pulp to heat-fusible fibers is not particularly limited, but is preferably, for example, 60:40 to 80:20.

[0073] The basis weight of the water-containing material is not particularly limited as long as it can hold the amount of water to be supplied to the storage bag, but it is preferably 50 g / m 2 The above are examples, and 100 g / m 2 The above are examples. If the basis weight is too large, the hydrated body becomes hard, and therefore, when the heating tool is applied to the skin, the feeling of use during application may be reduced. For this reason, when the hydrated body is applied to the skin, in particular, the basis weight is preferably 50 to 1000 g / m 2 , more preferably 100 to 600 g / m 2 is exemplified.

[0074] The water-containing body may have a single-layer or multi-layer structure. While this does not limit the present invention, a preferred example is a three-layer structure in which the aforementioned fiber material is further sandwiched between a pair of nonwoven fabrics, from the viewpoint of durability and water retention. In this case, the layer sandwiched between the pair of nonwoven fabrics is referred to as the middle layer, and the layers consisting of the pair of nonwoven fabrics are referred to as the end layers. The nonwoven fabrics of the end layers may be made of the same material or different materials. Examples of materials for the nonwoven fabrics of the end layers include hydrophilic fibers, hydrophobic fibers, synthetic fibers, and blended fibers of hydrophilic and synthetic fibers. Examples of hydrophilic fibers include, but are not limited to, preferred examples: rayon and cotton, and more preferably rayon. Making the material hydrophilic facilitates the absorption of moisture into hydrophilic fibers such as pulp during production, thereby facilitating production. Examples of hydrophobic fibers include, but are not limited to, polyesters such as polyethylene, polypropylene, and polyethylene terephthalate, and more preferably polyethylene and polypropylene. Making the material hydrophobic prevents wetting and stickiness. For this reason, for example, when the water-containing body comes into contact with the skin when using the heating tool, or when the heating tool is applied to the skin via the water-containing body, it is preferable to configure the surface of the water-containing body facing the skin with hydrophobic fibers and the opposite surface (the surface that comes into contact with the storage bag) with hydrophilic fibers such as rayon. The basis weight of such a pair of nonwoven fabrics is not particularly limited, but is preferably 20 to 50 g / m 2 The following is an example:

[0075] The water-retaining body can be formed not only from woven fabric or nonwoven fabric but also from a porous body such as a sponge. A porous body has a structure having a continuous internal space such as small holes, cracks, or voids, and water is retained in the spaces. The sponge is not particularly limited, but examples include various sponges such as synthetic sponges made primarily from synthetic resin materials such as urethane resin and melamine resin, natural sponges made primarily from natural materials such as sea sponge and cellulose, and rubber sponges made primarily from rubber materials such as synthetic rubber and natural rubber.

[0076] Although the water-containing body is not particularly limited, it is preferable that it is compressible and deformable by the action of an external force. In other words, it is preferable that the water-containing body releases water by being forced outward by compressive deformation. The water-containing body may release water by naturally seeping out the water it holds, but by configuring it to release water by compressive deformation, water can be released from the water-containing body with high reliability. Furthermore, it is more preferable that the water-containing body has flexibility that allows it to be easily compressed and deformed. This allows the water-containing body to release the aforementioned amount of water sufficient for heat generation without applying a large force to the water-containing body. Although not particularly limited, preferred examples of water-containing bodies that are easily compressible and deformable include sponges such as urethane sponges and stretchable nonwoven fabrics such as "Felibendy" (registered trademark) manufactured by Kuraray Kuraflex Co., Ltd. Furthermore, the water-containing body does not necessarily need to be elastic, but a preferred example of elasticity is that it tends to return to its original shape when the external force is removed. The elasticity may be such that the water-containing body, which is compressively deformed by the application of an external force, tends to return to its original shape, but does not necessarily need to completely return to its original shape.

[0077] For this reason, although the present invention is not limited to this method of releasing water from the water-containing body into the storage bag, for example, the water held in the water-containing body may be released into the storage bag by allowing it to naturally seep out of the water-containing body from the time the water-containing body comes into contact with the storage bag.

[0078] Furthermore, the method of releasing water from the water-containing body into the storage bag is not limited to the present invention, but for example, the water-containing body may be pressurized when it comes into contact with the storage bag, causing it to compress and deform, and the water held by the water-containing body may be pushed out of the water-containing body and released into the storage bag.

[0079] As described above, the water-containing material is not limited as long as it releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture when it is brought into contact with the storage bag at room temperature (about 15 to 25°C). More preferably, it releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture when it is brought into contact with the storage bag at room temperature (15 to 25°C). It is preferable that the water-containing body releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture per 60 seconds from the time of contact with the containing bag, and although this does not limit the present invention, it is preferable that the water-containing body releases more preferably 10 to 180 parts by mass, and even more preferably 60 to 115 parts by mass of water per 100 parts by mass of the mixture per 60 seconds from the time of contact with the containing bag. The released water is supplied to the mixture, causing the mixture to generate heat.

[0080] In order for the mixture in the storage bag to exhibit desired heat-generating properties (heat-generating temperature, heat-generating duration, and / or time it takes for the heat-generating temperature to rise after the start of heat generation) when heat is generated, it is preferable for the water-containing body to release a predetermined amount of water after contacting the storage bag. Furthermore, in order to more efficiently exhibit the desired heat-generating properties, it is more preferable for the water-containing body to release a predetermined amount of water within a predetermined time. If the amount of water released is too much or too little, it becomes difficult to generate heat, and even if the amount of water is the same, if the release rate is too fast or too slow, it becomes difficult to generate heat efficiently. From this perspective, it is preferable for the water-containing body to release the water within 60 seconds from the time of contacting the storage bag with the water-containing body as described above.

[0081] Therefore, although not limiting the present invention, a preferred method for releasing water from the water-containing body to the storage bag is to bring the water-containing body into contact with the storage bag and apply pressure to compress and deform it, thereby forcing the water held by the water-containing body out of the water-containing body, thereby releasing 10 to 210 parts by mass of water per 100 parts by mass of the mixture. Furthermore, it is more preferable to release the aforementioned amount of water by compressing and deforming it in this way.

[0082] Furthermore, although not limiting the present invention, a more preferred method for releasing water from the water-containing body to the storage bag is to pressurize the water-containing body for 60 seconds from the time of contacting the water-containing body with the storage bag, causing it to compress and deform, and then extruding the water held by the water-containing body from the water-containing body, thereby releasing 10 to 210 parts by mass of water per 100 parts by mass of the mixture. Furthermore, it is more preferred to release the aforementioned amount of water by compressing and deforming the water by pressurizing for 60 seconds in this manner. This allows the mixture in the storage bag to reliably receive a predetermined amount of water from the water-containing body within a predetermined time.

[0083] In this case, the force applied to the water-containing body is not particularly limited, but is preferably a force that allows the water-containing body to be pressed down by hand without difficulty, for example, about 1800 Pa or more, and preferably about 1800 to 6500 Pa. Here, if the water-containing body has flexibility that allows it to be easily compressed and deformed, such as the above-mentioned sponge or elastic nonwoven fabric, the force applied to the water-containing body may be relatively small, for example, about 1800 to 3000 Pa. In contrast, if the water-containing body is difficult to compress and deform, such as an ordinary nonwoven fabric, the force applied to the water-containing body needs to be relatively large, for example, about 4000 to 6500 Pa. The force applied to the water-containing body when pressurizing the water-containing body may be adjusted depending on the flexibility of the water-containing body so that 10 to 210 parts by mass of water are released into the storage bag per 100 parts by mass of the mixture in the storage bag.

[0084] Here, the amount of water released from the hydrated body is calculated by measuring the weight of the hydrated body before it comes into contact with the storage bag (weight A) and measuring the weight of the hydrated body after it comes into contact with the storage bag (weight B), and then subtracting the latter weight (weight B) from the former weight (weight A).

[0085] The ratio of 10 to 210 parts by mass of water per 100 parts by mass of the mixture is calculated by subtracting weight B from weight A, dividing the result by the weight of the mixture contained in the containing bag (before contact with the water-containing body), and multiplying the result by 100. That is, it is calculated using the following formula.

[0086] Emission rate per 100 parts by mass of mixture = ((Weight A) - (Weight B)) x 100 / Weight of the mixture contained in the storage bag

[0087] As the water-containing body, preferably, the weight of the water-containing body measured 60 seconds after the start of supplying water to the mixture by contacting the storage bag with the water-containing body is defined as weight B, and an example of a water-containing body that satisfies the above value is given.

[0088] The amount of water held in the hydrous material (water holding amount) is not limited as long as it can release the aforementioned predetermined amount of water, and may be appropriately determined taking into consideration the amount of the mixture, the desired heating temperature, the application of the heating tool, etc. The amount of water held in the hydrous material does not limit the present invention, but examples thereof include any amount such as 1 g or more, 3 g or more, 6 to 30 g, or 8 to 25 g.

[0089] In this heating tool, if the water-containing body holds more water than can be absorbed by the mixture, the water held in the water-containing body will turn into steam due to heat generated by the mixture, and the heating tool can humidify the application site and its surroundings. When capable of humidification in this way, the heating tool also has a humidifying function and a moisturizing function, and is therefore useful as a heating tool for humidification and moisturizing.

[0090] The water-containing body may remain in contact with the storage bag while the mixture is generating heat, or may be removed from the storage bag after the mixture is heated. For example, from the viewpoint of preventing low-temperature burns caused by direct contact of the mixture with the skin or the like, or, as described above, from the viewpoint of supplying warm steam emitted from the water-containing body retaining water to the application site and its surroundings while the mixture is generating heat, it is preferable that the water-containing body remain in contact with the storage bag while the mixture is generating heat. From this viewpoint, it is preferable that the heating tool is used so that the water-containing body side, not the storage bag side, comes into contact with the skin or the like.

[0091] Other components can also be added to the water held in the water-containing body.

[0092] Although not limiting the present invention, an example of another component added to water is salt. An example of water containing salt is 0.1 to 10% by mass of salt water. In this case, the salt water is retained in the hydrated body. For example, salt may be added to water from the viewpoint of further suppressing uneven heat generation.

[0093] In addition, as another component, polyols can be exemplified, but are not limited to the present invention. Examples of polyols include, but are not limited to, glycerin, dipropylene glycol, 1,3-butylene glycol, propylene glycol, sorbitol, 1,2-pentanediol, 1,2-hexanediol, etc., and more preferably glycerin from the viewpoint of safety. In addition to these, preservatives such as methylparaben and phenoxyethanol, moisturizers such as hyaluronate and betaine, plant extracts, water-soluble thickeners such as xanthan gum, hydroxypropylmethylcellulose (HPMC), hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC), agar, guar gum, and carrageenan, fragrances such as eucalyptus and mint, and surfactants (nonionic surfactants, amphoteric surfactants, anionic surfactants) that solubilize fragrances, etc., can be added as appropriate.

[0094] The water-containing material is preferably stored in a bag made of an impermeable aluminum laminate film, aluminum-deposited PET film, transparent (silica)-deposited PET film, or the like, until it is brought into contact with the storage bag.

[0095] Heating tool The heating tool includes the mixture, the containing bag, and the water-containing body. In the heating tool, the mixture is contained in the containing bag.

[0096] The heating tool brings the water-permeable portion of the storage bag into contact with the water-containing body, The body releases water that it has retained, and the mixture contained in the storage bag absorbs the released water, generating heat in the presence of air (oxygen). For this reason, contact can be made when using the heating tool.

[0097] The heating tool may further include a storage section for storing the water-containing body and / or the storage bag so that the water-containing body and the storage bag come into contact with each other. The storage section may store only one of the water-containing body and the storage bag, or may store both, and preferably stores the water-containing body.

[0098] To explain one example of such a storage section, although this does not limit the present invention, the storage section may be provided on the outside of the storage bag (for example, on one surface having water permeability), and in this case, the water-containing material may be stored in the storage section, thereby bringing the water-containing material into contact with the one surface of the storage bag and generating heat. Although this does not limit the present invention, for example, the shape and size of the storage section are not particularly limited as long as it is capable of storing the water-containing material therein, and a preferred example is that the storage section is formed to have the same shape and size as the storage bag.

[0099] Although this does not limit the present invention, a storage section may be provided in a part of the water-containing body, and in this case, the water-permeable side of the storage bag may be placed in the storage section so that it faces the water-containing body, thereby bringing the water-containing body into contact with the storage bag.

[0100] Although not limiting the present invention, when the heating tool has a storage section capable of storing both the water-containing body and the storage bag, both the water-containing body and the storage bag may be stored in the storage section, and the water-containing body and the storage bag may be brought into contact with each other while stored in this manner.

[0101] Although not limiting the present invention, if the heating tool has a storage section that can store both the water-containing body and the storage bag, and a partition is provided within the storage section to form a compartment structure that can store the water-containing body and the storage bag separately, the water-containing body and the storage bag can be stored in each compartment, and the water-containing body and the storage bag can be brought into contact with each other while stored in this manner.

[0102] When the water-containing body and the containing bag are not in direct contact with each other as described above but are in contact via a partition or the like, water is supplied from the water-containing body to the containing bag through the contact portion. From this point of view, at least a part of the partition at the contact portion has water permeability that allows water to be supplied from the water-containing body to the containing bag. As a result, water is supplied from the water-containing body to the containing bag, and the mixture generates heat. Contact, heat generation, water permeability, etc. are explained in the same manner as above.

[0103] Although this does not limit the present invention, the storage section may be either moisture-impermeable or moisture-permeable, but from the perspective of humidifying the application site of this heating tool and its surroundings, it is preferable that at least a portion of the storage section, preferably the entire area that is applied to the skin, etc., be moisture-permeable.

[0104] Examples of such moisture-permeable storage sections include storage sections made of moisture-permeable resin film, storage sections made of moisture-permeable woven or nonwoven fabric, and laminates of moisture-permeable resin film and moisture-permeable woven or nonwoven fabric. Since this heating tool is applied to the skin and considering the feel on the skin, it is preferable to use woven or nonwoven fabric so that the woven or nonwoven fabric comes into contact with the skin. There are no limitations on the resin, woven or nonwoven fiber material used for the resin film of the storage section, as long as it is moisture-permeable.

[0105] The moisture-permeable resin film of the storage section has pores at least in part to ensure moisture permeability. The size of the pores is not particularly limited as long as the pores can pass through the film, and the shape and number of the pores are also not particularly limited. The resin film having pores has been known in the art. Examples of the material include a resin film or a porous film having a large number of perforations. The pores may be uniformly present throughout the resin film, or may be densely present in a portion. The moisture-permeable woven or nonwoven fabric of the storage portion is also not particularly limited in terms of basis weight, as long as it allows vapor to pass through.

[0106] The thickness of the storage section is not particularly limited, and the moisture permeability of the storage section is also not particularly limited as long as it allows hot steam emitted from the water-containing body to pass through. The moisture permeability of the storage section is appropriately set depending on the number and size of holes in the resin film constituting the storage section, the basis weight of the woven or nonwoven fabric, etc. The storage section may be breathable.

[0107] The heating tool may contain one or more bags containing the mixture as long as it can generate heat as described above. Also, the heating tool may contain one or more water-containing bodies.

[0108] Furthermore, without limiting the present invention, the storage bag may be attached to any carrier, and the carrier may be provided with a storage section for storing the water-containing material, and the water-containing material may be stored in the storage section, and the water-containing material may be brought into contact with the storage bag in this stored state.

[0109] Although the present invention is not limited thereto, examples of using such a carrier include the masks shown in FIGS.

[0110] 1 to 3 show a mask 1, which includes a main body 2 that covers part of a wearer's face (the area under the eyes, particularly the nose and mouth) when worn, a pair of ear loops 3 for holding the main body 2 on the wearer's face, a storage bag 5 that stores a mixture 4 (shown in FIG. 3), a water-containing body 6 that holds water that can be supplied to the mixture 4, and a storage section 7 that stores the water-containing body 6 and brings it into contact with the storage bag 5. An opening 70 is formed in the storage section 7, and the opening 70 is a portion for placing the water-containing body 6 in the space within the opening. By storing the water-containing body 6 in the storage section 7 through the opening 70, the water-containing body 6 can be brought into contact with the storage bag 5 while retaining the water-containing body 6. The mixture 4 in the storage bag 5 receives water from the water-containing body 6 that is in contact with the storage bag 5 and generates heat by coming into contact with air.

[0111] Although not limiting the present invention, the storage bag 5 can also heat the water-containing body 6 in contact with the storage bag 5 by the heat generated by the mixture 4. If the water-containing body 6 holds more water than is necessary to heat the mixture 4, hot steam will be emitted from the water-containing body 6 when the mask 1 is worn. Fig. 1 is an example of the mask 1, but this also aids in understanding the explanation of the storage section of this heating tool other than the mask.

[0112] When the water-containing body, the storage bag and / or the carrier has a storage section, the storage section can be attached, for example, by joining the storage section to a part of the water-containing body, the storage bag and / or the carrier by a method such as adhesion, welding (thermal welding, ultrasonic welding, etc.), sewing, etc.

[0113] This heating tool can be used for any purpose, including as a heat retaining device, a thermotherapy device, a mask, an eye mask, etc. Furthermore, for example, if the mixture, the storage bag, and / or the hydrated body contains an analgesic component as an active ingredient, this heating tool can be said to have an analgesic effect (an analgesic tool), and if it contains a substance having an anti-inflammatory effect, a blood circulation promoting effect, etc., this heating tool can also be said to have an anti-inflammatory effect (an anti-inflammatory tool), a blood circulation promoting effect (a blood circulation promoting tool), etc. Furthermore, if it emits steam derived from the water held in the hydrated body, this heating tool may be used as a humidifier, moisturizer, etc., and in this case, it is useful for humidifying and moisturizing the application site and its surroundings. Although this does not limit the present invention, when this heating tool is used, for example, as a mask that emits steam, it is said to be a mask that humidifies the throat and nose with steam. When used as a steaming eye mask, it can be said to be a mask that humidifies the area around the eyes with steam.

[0114] In order to facilitate the carrying of the heating tool, the heating tool may be housed in any breathable and / or non-breathable outer bag, etc. Such outer bags, etc. are conventionally known.

[0115] According to the present invention, the desired heat generating characteristics (heat generating temperature, heat generating duration, and / or heat generating start time) can be exhibited simply by bringing the water-containing material into contact with the storage bag containing the mixture. Also, according to the present invention, the desired heat generating characteristics can be exhibited simply by bringing the water-containing material into contact with the storage bag once. [Example]

[0116] The present invention will be described below with reference to examples, but the present invention is not limited to the following examples. Test Example 1 Preparation of the mixture Mixtures (Examples 1 to 8, Comparative Examples 1 and 2) were obtained by mixing oxidizable metal powder, an oxidation promoter, a water-retaining agent, and water-soluble salts according to the compositions shown in Table 1. In the table, the content of the mixture is expressed in weight percent. The components are as follows: Oxidizable metal powder: Iron powder (product name Atmel 80AF-2, manufactured by Kobe Steel, Ltd.) Oxidant promoter: activated carbon, synthetic aluminum silicate (trade name Kyoward 700, manufactured by Kyowa Chemical Industry Co., Ltd.) Water-retaining agent: sodium polyacrylate (trade name: Sunfresh K31, manufactured by Sanyo Chemical Industries, Ltd., water absorption speed: 35 seconds), crystalline cellulose 1 (trade name: Comprecel S 101, manufactured by Fushimi Pharmaceutical Co., Ltd.), crystalline cellulose 2 (trade name: Ceolus KG-802, manufactured by Asahi Kasei Corporation) Water-soluble salts: sodium chloride (product name TF-100, manufactured by Salt Kansai Co., Ltd.)

[0117] 12 g of each mixture was placed in a water-permeable bag (50 mm × 80 mm) and sealed to obtain a bag containing the mixture. Because the mixture did not generate heat when in contact with air, it was left as is without being placed in an air-impermeable bag until it was brought into contact with the water-containing material described below.

[0118] Preparation of hydrated bodies As a water-containing material, nonwoven fabric (product name: Felibendi 150g / m 2(Manufactured by Kuraray Kuraflex Co., Ltd., ethylene-vinyl alcohol copolymer, steam jet manufacturing method) was used. Specifically, in Examples 1 to 8 and Comparative Examples 1 and 2, the nonwoven fabric (size: 60 mm x 90 mm) was used as the water-containing body, and in Examples 7 and 8, two sheets of the nonwoven fabric used in Example 1 stacked together were used as the water-containing body.

[0119] The amount of water absorbed by each hydrous material was 2 g for Example 1, 4 g for Example 2, 10 g for Example 3, 11 g for Example 4, 14 g for Example 5, 20 g for Example 6, 22 g for Example 7, 25 g for Example 8, 0.5 g for Comparative Example 1, and 1 g for Comparative Example 2.

[0120] Release of water from hydrous bodies Water was released from the water-containing material into the mixture as follows: At room temperature (approximately 15 to 25°C), the water-loaded water-containing material was placed on one side (the water-permeable side) of the bag containing the mixture, and immediately placed in contact with the bag under a 3.6 kg load (approximately 6500 Pa), followed by standing for 1 minute.

[0121] The amount of water released from the hydrous body was measured by measuring the weight of the hydrous body (weight before contact) immediately before contact. As described above, the weight of the hydrous body was measured after leaving it to stand for 1 minute (weight after contact), and the weight after contact was subtracted from the weight before contact, and the obtained value was regarded as the amount of water released from the hydrous body. Note that no leakage of the released water from the storage bag or the like was observed, i.e., all of the released water was absorbed by the mixture in the storage bag.

[0122] Fever assessment The heat generation was evaluated according to the following procedure. First, a temperature sensor was attached and fixed with tape to the surface of the bag containing the mixture opposite to the surface that contacts the weight. Next, the bag (the other side not attached to the temperature sensor) was brought into contact with a hydrated material. The bag was then placed on a wire rack with the opposite side (the side with the temperature sensor attached) facing downward, and the temperature was measured at room temperature (approximately 15 to 25°C), thereby measuring the heat generation temperature and time. During this time, data was recorded at 5-second intervals using the temperature sensor. After leaving the bag to stand for 1 minute under a load as described above, the hydrated material was removed from the bag.

[0123] Next, based on the exothermic temperature and time measured in this manner, the maximum exothermic temperature (maximum exothermic temperature within 3 hours from the application of the load), the duration of the exothermic temperature exceeding 40°C, and the time until the exothermic temperature exceeded 40°C (rise time) were evaluated. Specifically, for the maximum exothermic temperature, a temperature exceeding 40°C was rated as ◯, a temperature below 40°C but exceeding 30°C was rated as △, and a temperature below 30°C was rated as X. For the duration, a temperature exceeding 40°C for 30 minutes or more was rated as ◯, a temperature less than 30 minutes but 10 minutes or more was △, and a temperature less than 10 minutes was rated as X. For the rise time, the time required for the temperature to exceed 40°C after the contact was rated as ◯ if it was within 7 minutes, △ if it was more than 7 minutes but less than 12 minutes, and X if it was longer than 12 minutes.

[0124] result The results are shown in Table 1.

[0125] [Table 1]

[0126] As is clear from Table 1, in Comparative Examples 1 and 2, in which the amount of water released per 100 parts by weight of the mixture was small, the heat generation (maximum temperature) was low, and the desired heat generation duration and heat generation rise were not observed. In contrast, in Examples 1 to 8, in which the amount of water released per 100 parts by weight of the mixture was increased, good heat generation (maximum temperature) was achieved, and the heat generation duration was 10 minutes or more, and the heat generation began within 12 minutes.

[0127] This confirmed that good heat generation properties were obtained according to Examples 1 to 8. This also confirmed that good heat generation properties were obtained even when, during use, the water-containing material was brought into contact with the storage bag to release water, and the mixture in the storage bag absorbed the water.

[0128] Test Example 2 Preparation of the mixture Oxidizable metal powder, an oxidation promoter, a water-retaining agent, and water-soluble salts were mixed according to the compositions shown in Table 2 to obtain mixtures (Examples 9 and 10, Comparative Example 3). In the table, the content of the mixture is expressed in weight percent. The same components as those used in Test Example 1 were used.

[0129] 11 g of each mixture obtained was placed in a water-permeable storage bag (same as in Test Example 1, 50 mm × 80 mm in size) and sealed to obtain a storage bag containing the mixture. Because the mixture does not generate heat when in contact with air, it was left as is without being placed in an air-impermeable bag until it was brought into contact with the water-containing material described below.

[0130] Preparation of hydrated bodies The hydrous material used in Examples 9 and 10 was the same as that used in Test Example 1, and a nonwoven fabric (product name HP-55, manufactured by Nippon Vilene Co., Ltd., needle punch method) was used in Comparative Example 3, and water was similarly retained in these materials. The amount of water absorbed by each hydrous material was 11 g in all cases.

[0131] Release of water from hydrous bodies Release of water from the hydrous body to the mixture was also carried out in the same manner as in Test Example 1. In Example 9, a load of 1 kg (approximately 1800 Pa) was applied and left to stand for 1 minute, in Example 10, a load of 3.6 kg (approximately 6500 Pa) was applied and left to stand for 1 minute, and in Comparative Example 3, a load of 1 kg (approximately 1800 Pa) was applied and left to stand for 1 minute. The amount of water released from the hydrous body was also calculated in the same manner as in Test Example 1. In this test example, no leakage of the released water from the storage bag or the like was observed, i.e., all of the released water was absorbed by the mixture in the storage bag.

[0132] Fever assessment After the contact, heat generation was evaluated in the same manner as in Test Example 1. result The results are shown in Table 2.

[0133] [Table 2]

[0134] As is clear from Table 2, in Comparative Example 3, in which the amount of water released per 100 parts by weight of the mixture was small, the heat generation (maximum temperature) was low, and the desired heat generation duration and heat generation start were not observed. In contrast, in Examples 9 and 10, in which the amount of water released per 100 parts by weight of the mixture was increased, good heat generation (maximum temperature) was achieved, and a heat generation duration of 30 minutes or more and a heat generation start within 7 minutes were observed.

[0135] This confirmed that good heat generation properties were obtained by releasing a predetermined amount of water from the water-containing body and absorbing it into the mixture according to Examples 9 and 10. This also confirmed that good heat generation properties were obtained even when the water-containing body was brought into contact with the storage bag during use to release water and absorb it into the mixture in the storage bag. [Explanation of symbols]

[0136] 1. Mask 2 Main body 3 Ear hook 4 mixture 5 Storage bag 6 Hydrous body 7. Storage section

Claims

[Claim 1] The method comprises a storage bag containing a mixture including an oxidizable metal powder, an oxidation promoter, and a water-retaining agent, and a water-containing body; At least a part of the side of the storage bag that comes into contact with the water-containing body is water-permeable, The heating tool releases 10 to 210 parts by mass of water per 100 parts by mass of the mixture from the moment the water-containing body comes into contact with the storage bag.

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