Chemical body warmer and coldness remedy tool

Abstract

To provide a chemical body warmer that is used upon being accommodated in a holder worn on an upper arm or a thigh, the chemical body warmer not causing discomfort when the holder is worn, and exhibiting exceptional stability of a warming effect.SOLUTION: A chemical body warmer is used upon being accommodated in a holder worn on an upper arm or a thigh. The chemical body warmer is configured such that a heat-generating composition that contains an oxidizable metal is accommodated in an accommodating body having a moisture-permeable sheet on at least one surface thereof. The chemical body warmer has a rigidity value of 4.0-12.0 N at the start of heat generation. The moisture-permeable sheet has a moisture permeability of 400-650 g / m2 day.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a chemical warmer that is used by being housed in a holder worn on the upper arm or thigh. The present disclosure also relates to a hand or foot cold improvement device including the chemical warmer and a holder worn on the upper arm or thigh.

Background Art

[0002] There is known a holder for a chemical warmer that has a pocket and is worn on a part of the user's body with a chemical warmer (so-called disposable warmer) housed in the pocket. For example, Patent Document 1 discloses a holder for a chemical warmer worn on the upper arm.

[0003] Conventionally, chemical warmers have been developed in various types depending on the application site, such as a type that is held in the hand for easy warming effect, a type that is used by being placed in a pocket, a type that is attached to clothes or the skin, and a type that is disposed on the sole of the foot. As chemical warmers, those using a heat generation mechanism in which an oxidizable metal powder such as iron powder generates oxidation heat by contact with oxygen and containing the oxidizable metal powder in a breathable container are widely used.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the case of a holder for a chemical warmer worn on the upper arm or thigh, since the thickness and shape of the upper arm or thigh change significantly with the bending and stretching of the elbow or knee, when a conventional chemical warmer (types such as those held in the hand, used in a pocket, attached to clothing or the skin, and disposed on the sole of the foot) is accommodated in the pocket of the holder, a discomfort caused by the chemical warmer occurs when the holder is worn (when the chemical warmer generates heat), or it has been found that there is a problem that the warming effect is not stable.

[0006] An object of the present disclosure is to provide a chemical warmer that is used by being accommodated in a holder worn on the upper arm or thigh, does not cause discomfort when the holder is worn, and has excellent stability of the warming effect.

Means for Solving the Problems

[0007] As a result of intensive studies to solve the above problems, the inventor has found that by adjusting the rigidity value at the start of heat generation of the chemical warmer and the moisture permeability of the moisture-permeable sheet constituting the chemical warmer within a specific range, a chemical warmer that does not cause discomfort when the holder is worn (when the chemical warmer generates heat) and has excellent stability of the warming effect can be obtained. The present disclosure has been completed by further studies based on such findings.

[0008] That is, the present disclosure provides an invention in the following aspects. Item 1. A chemical warmer that is used by being accommodated in a holder worn on the upper arm or thigh, wherein the chemical warmer has a heat-generating composition containing an oxidizable metal accommodated in a container having a moisture-permeable sheet on at least one surface, the chemical warmer has a rigidity value at the start of heat generation of 4.0 to 12.0 N, the moisture-permeable sheet has a moisture permeability of 400 to 650 g / m 2 ·day, the chemical warmer. Item 2. The chemical warmer according to Item 1, wherein the moisture-permeable sheet has a bending rigidity value of 1.0 to 2.0 gf·cm 2 / cm. Item 3. The container has a moisture-proof sheet on the other surface, and the moisture-proof sheet has a bending rigidity value of 0.1 to 1.0 gf·cm 2 / cm. The chemical warmer according to Item 1 or 2 Item 4. A hand or foot coldness improver including the chemical warmer according to any one of Items 1 to 3 and a holder worn on the upper arm or thigh [Effect of the Invention]

[0009] When the chemical warmer of the present disclosure is housed and used in a pocket of a holder worn on the upper arm or thigh, even if the thickness and shape of the upper arm or thigh change significantly as the elbow or knee bends and extends, it can sufficiently follow the change and fit the upper arm or thigh, so that there is no discomfort from the start to the end of heat generation. Also, even if the air permeability of the pocket changes due to changes in the basis weight and thickness of the part constituting the pocket of the holder as the elbow or knee bends and extends, excellent thermal effect stability can be imparted [Brief Description of the Drawings]

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

[0011] In this specification, the notation X to Y regarding a numerical range indicates that it is X or more and Y or less

[0012] 1. Chemical warmer The chemical warmer of the present disclosure is used by being housed in a holder worn on the upper arm or thigh. The chemical warmer has a heat-generating composition containing an oxidizable metal housed in a container having a moisture-permeable sheet on at least one surface. The chemical warmer has a rigidity value at the start of heat generation of 4.0 to 12.0 N, and the moisture-permeable sheet has a moisture permeability of 400 to 650 g / m 2 ·day. Hereinafter, the chemical warmer of the present disclosure will be described in detail.

[0013] [Structure of Chemical Warmer] The chemical warmer of the present disclosure has a heat-generating composition containing an oxidizable metal housed in a container having a moisture-permeable sheet on at least one surface.

[0014] The heat-generating composition is a composition that generates heat when an oxidizable metal and oxygen come into contact.

[0015] The type of the oxidizable metal is not particularly limited as long as it can generate heat by oxidation. For example, metals such as iron (reduced iron, cast iron, atomized iron, electrolytic iron), aluminum, zinc, manganese, magnesium, and calcium can be mentioned. These oxidizable metals may be used alone or in combination of two or more. The shape of the oxidizable metal is not particularly limited, but from the viewpoint of heat generation efficiency, it is preferably in powder form, granular form, or fibrous form, and more preferably in powder form. The content of the oxidizable metal in the heat-generating composition is appropriately set according to the heat generation characteristics to be imparted. For example, it is about 20 to 80% by weight, and from the viewpoint of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 25 to 70% by weight, more preferably 45 to 60% by weight.

[0016] The exothermic composition may contain an oxidation accelerator as necessary. The oxidation accelerator serves to retain oxygen and supply oxygen to the metal to be oxidized. The type of the oxidation accelerator is not particularly limited as long as it can retain oxygen and supply oxygen to the metal to be oxidized. Examples thereof include carbon materials such as activated carbon, carbon black, acetylene black, bamboo charcoal, charcoal, coffee husk charcoal, graphite, coal, coconut shell charcoal, blue carbon, peat, and lignite. These oxidation accelerators may be used alone or in combination of two or more. Among these oxidation accelerators, activated carbon, carbon black, bamboo charcoal, charcoal, and coffee husk charcoal are preferable, and activated carbon is more preferable. Further, the shape of the oxidation accelerator is not particularly limited, but from the viewpoint of heat generation efficiency, it is preferably in powder form, granular form, or fibrous form, and more preferably in powder form. The content of the oxidation accelerator in the exothermic composition is appropriately set according to the heat generation characteristics to be imparted. For example, it is about 1 to 30% by weight, and from the viewpoint of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 3 to 25% by weight, and more preferably 4 to 25% by weight.

[0017] The exothermic composition may contain water as necessary. Water serves to oxidize the metal to be oxidized together with oxygen. Any of distilled water, ion-exchanged water, pure water, ultrapure water, tap water, industrial water, etc. may be used for the water. The content of water in the exothermic composition is appropriately set according to the heat generation characteristics to be imparted. For example, it is about 5 to 50% by weight, and from the viewpoint of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 10 to 40% by weight, and more preferably 15 to 35% by weight.

[0018] The exothermic composition may contain water-soluble salts, if necessary. When water-soluble salts are included, it becomes possible to accelerate the oxidation of the oxidizable metal. The type of water-soluble salts is not particularly limited. For example, sulfates, hydrogen carbonates, chlorides or hydroxides of alkali metals (such as sodium and potassium), alkaline earth metals (such as calcium and magnesium), or heavy metals (such as iron, copper, aluminum, zinc, nickel, silver, and barium) can be mentioned. Among these water-soluble salts, from the viewpoints of conductivity, chemical stability, etc., chlorides such as sodium chloride, potassium chloride, calcium chloride, magnesium chloride, iron (II, III) chloride, etc. are preferable, and sodium chloride etc. are more preferable. These water-soluble salts may be used alone or in combination of two or more. The content of the water-soluble salts in the exothermic composition is appropriately set according to the exothermic characteristics to be imparted. For example, it is about 0.1 to 10% by weight, and from the viewpoint of making it easy to adjust the rigidity value of the chemical heat pack at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 0.5 to 7% by weight, more preferably 1 to 5% by weight.

[0019] The exothermic composition may contain a water retention agent, if necessary. The water retention agent plays a role of retaining water and supplying water to the oxidation reaction site. The type of the water retention agent is not particularly limited. For example, inorganic porous substances such as vermiculite, perlite, calcium silicate, magnesium silicate, kaolin, talc, smectite, mica, bentonite, calcium carbonate, silica gel, alumina, zeolite, silicon dioxide, and diatomaceous earth; organic substances such as pulp, wood powder, cotton, starches, and celluloses; water-absorbing resins such as polyacrylic acid-based resins, polysulfonic acid-based resins, maleic anhydride-based resins, polyacrylamide-based resins, polyvinyl alcohol-based resins, polyethylene oxide-based resins, polyaspartic acid-based resins, polyglutamic acid-based resins, and polyalginic acid-based resins can be mentioned. These water retention agents may be used alone or in combination of two or more. Among these water retention agents, vermiculite, polyacrylic acid-based resins, wood powder, and pulp are preferably used; more preferably, vermiculite and polyacrylic acid-based resins are used. The content of the water retention agent in the exothermic composition is appropriately set according to the exothermic characteristics to be imparted. For example, it is about 1 to 20% by weight, and from the viewpoint of easily adjusting the rigidity value of the chemical warmer at the start of exotherm within the range of 4.0 to 12.0 N, it is preferably 3 to 15% by weight, more preferably 4 to 10% by weight.

[0020] The exothermic composition may further contain other additives such as a sequestering agent, a fragrance, a thickener, an excipient, a surfactant, and a hydrogen generation inhibitor, if necessary.

[0021] The exothermic composition can be prepared by mixing the aforementioned components in a predetermined amount. The preparation of the exothermic composition may be carried out in the presence of oxygen, but it is preferably carried out under reduced pressure or in an inert gas atmosphere.

[0022] The filling rate of the exothermic composition in the container is, for example, 0.25 to 0.47 g / cm 2In terms of degree, from the viewpoint of facilitating adjustment of the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 0.26 to 0.46 g / cm 2 , more preferably 0.27 to 0.45 g / cm 2 , still more preferably 0.28 to 0.44 g / cm 2 .

[0023] In the chemical warmer of the present disclosure, the container for accommodating the exothermic composition has a moisture-permeable sheet on at least one surface in order to supply oxygen and water vapor to the exothermic composition during use. And the moisture-permeable sheet has a moisture permeability of 400 to 650 g / m 2 ·day. By using a moisture-permeable sheet having a moisture permeability of 400 to 650 g / m 2 ·day, when the chemical warmer is accommodated in the pocket of the holder worn on the upper arm or thigh, even if the basis weight and thickness of the part constituting the pocket of the holder change with the bending and stretching of the elbow or knee, resulting in a change in the air permeability of the pocket, a suitable heating temperature (about 42 to 55 °C) can be stably maintained for a long time (8 hours or more). Note that since the pocket of the holder is made of a moisture-permeable material, it does not affect the moisture permeability of the moisture-permeable sheet.

[0024] The moisture permeability of the moisture-permeable sheet may be 400 to 650 g / m 2 ·day, but from the viewpoint of more stably maintaining a more suitable heating temperature for a longer time, it is preferably 405 to 640 g / m 2 ·day, more preferably 410 to 630 g / m 2 ·day. In the present disclosure, the moisture permeability is a value measured in accordance with JIS K 7129-5:2016 (Plastics - Films and Sheets - Methods of Test for Water Vapor Transmission Rate - Part 5: Pressure Sensor Method).

[0025] The material of the moisture-permeable sheet is not particularly limited as long as it can have the above-mentioned moisture permeability, but it is preferably formed of at least a breathable resin layer (a resin layer having pores), and from the viewpoint of improving the usability, a laminated sheet of a breathable resin layer and a fiber base material is more preferable. For the laminated sheet of the breathable resin layer and the fiber base material, the breathable resin layer and the fiber base material may be laminated in this order from the inside to the outside of the container.

[0026] The constituent resin of the breathable resin layer is not particularly limited, and examples thereof include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and the like. Among these resins, from the viewpoint of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer are preferably used. The above-mentioned constituent resin may be used alone or in combination of two or more.

[0027] Further, the breathable resin layer may be a resin film provided with pores for ensuring breathability. The shape, size, and number of the pores provided in the resin film may be appropriately set according to the moisture permeability to be provided in the container.

[0028] Specific examples of the fiber base material used for the moisture-permeable sheet include non-woven fabric and woven fabric. From the perspective of usability and the like, non-woven fabric is preferably used. The material of the fiber base material is not particularly limited. For example, synthetic fibers such as polyethylene terephthalate, polybutylene terephthalate, nylon, polypropylene, polyethylene, vinylon, rayon, acrylic, acetate, and polyvinyl chloride; natural fibers such as cotton, hemp, silk, and paper; and mixed fibers thereof can be mentioned. Among these materials, from the perspective of enhancing the usability and the perspective of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, polyethylene terephthalate, nylon, and polypropylene are preferably used, and polyethylene terephthalate and nylon are more preferably used. The above materials may be used alone or in combination of two or more.

[0029] The lamination of the breathable resin layer and the fiber base material can be carried out by known lamination methods such as dry lamination, extrusion lamination, and thermal lamination.

[0030] The thickness of the moisture-permeable sheet may be appropriately set according to the layer structure of the moisture-permeable sheet and the like. For example, it is about 15 to 150 μm. From the perspective of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 30 to 100 μm, and more preferably 50 to 80 μm.

[0031] The basis weight of the moisture-permeable sheet may be appropriately set according to the layer structure of the moisture-permeable sheet and the like. For example, it is about 1 to 100 g / m 2 From the perspective of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 5 to 70 g / m 2 and more preferably 10 to 50 g / m 2 is used.

[0032] The bending rigidity value of the moisture-permeable sheet is not particularly limited. From the perspective of easily adjusting the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 1.0 to 2.0 gf·cm 2 / cm, more preferably 1.2 to 1.9 gf·cm 2 / cm, even more preferably 1.4 to 1.8 gf·cm 2 / cm. In the present disclosure, the flexural rigidity value is obtained by using a pure bending tester, with the sample being a 10 cm square, gripping the sample with chucks at 1 cm intervals, and performing a pure bending test at a deformation rate of 0.50 (cm -1 ) within the range of a curvature of -2.5 to +2.5 cm -1 . The flexural rigidity value of the moisture-permeable sheet can be adjusted to the above numerical range by appropriately adjusting the materials of the breathable resin layer and the fiber substrate, the number of their laminations, the thickness, etc.

[0033] The container only needs to have the moisture-permeable sheet on at least one surface. Preferred examples of the container include a container in which the peripheral edges of two of the moisture-permeable sheets are bonded together, and a container in which the peripheral edges of the moisture-permeable sheet and a non-moisture-permeable sheet (also referred to as a low-moisture-permeable sheet) are bonded together. The method of bonding these is not particularly limited. For example, when a heat-sealable resin is used in the moisture-permeable sheet or the non-moisture-permeable sheet, the peripheral edge may be heat-sealed (heat-sealed) using the heat-sealable resin, or the peripheral edge may be bonded together using an adhesive.

[0034] The moisture permeability of the non-moisture-permeable sheet is, for example, 10 g / m 2 ·day or less, preferably 5 g / m 2 ·day or less, more preferably 2 g / m 2 ·day or less, even more preferably 1 g / m 2 ·day or less, particularly preferably 0 g / m 2 ·day.

[0035] The material of the moisture-impermeable sheet is not particularly limited, but preferably, a resin sheet without pores is used. The constituent resin of the resin sheet constituting the moisture-impermeable sheet is not particularly limited, and examples thereof include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and the like. Among these resins, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and polyethylene terephthalate are preferred. The constituent resin may be used alone or in combination of two or more. Further, the moisture-impermeable sheet may be a resin sheet with a metal vapor-deposited thereon, preferably an aluminum vapor-deposited resin sheet, more preferably an aluminum vapor-deposited polyethylene terephthalate sheet.

[0036] The thickness of the resin sheet constituting the moisture-impermeable sheet may be appropriately set according to the layer structure of the moisture-impermeable sheet and the like. For example, it is about 40 to 150 μm, and from the viewpoint of facilitating adjustment of the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 50 to 100 μm, more preferably 60 to 90 μm.

[0037] The moisture-impermeable sheet may, if necessary, have a fiber base material laminated on a resin sheet without pores. The material, basis weight, etc. of the fiber base material used in the moisture-impermeable sheet are the same as those exemplified for the moisture-permeable sheet.

[0038] The bending rigidity value of the moisture-impermeable sheet is not particularly limited, but from the viewpoint of facilitating adjustment of the rigidity value of the chemical warmer at the start of heat generation within the range of 4.0 to 12.0 N, it is preferably 0.1 to 1.0 gf·cm 2 / cm, more preferably 0.15 to 0.7 gf·cm 2 / cm, still more preferably 0.2 to 0.5 gf·cm 2It is / cm. The bending rigidity value of the moisture-proof sheet can be adjusted to the above numerical range by appropriately adjusting the materials of the resin sheet and fiber base material, the number of their laminations, thickness, etc.

[0039] Regarding the shape of the container, it may be appropriately set so that it can be accommodated in the pocket of the holder. For example, in the case of a holder worn on the upper arm or thigh as shown in FIG. 2, the planar shape of the container is a shape corresponding to the planar shape of the pocket 22 of the holder. Specifically, a shape in which one end side extends in one direction from a straight end side and the other end side is circular can be mentioned.

[0040] In the container, the area of the portion that houses the exothermic composition (the area of the portion where the exothermic composition is housed when viewed in plan) is, for example, 20 to 100 cm 2 or so, preferably 25 to 70 cm 2 , more preferably 30 to 50 cm 2 is.

[0041] [Rigidity value of chemical warmer] The chemical warmer of the present disclosure has a rigidity value of 4.0 to 12.0 N at the start of heat generation. By accommodating and using the chemical warmer having a rigidity value of 4.0 to 12.0 N in a holder worn on the upper arm or thigh, even if the thickness and form of the upper arm or thigh change greatly as the elbow or knee bends and extends, the chemical warmer can sufficiently follow the change and fit the upper arm or thigh. Therefore, there is no sense of discomfort from the start to the end of heat generation, and the effect of being able to stably maintain a suitable heat generation temperature (about 42 to 55 ° C) for a long time (8 hours or more) can be obtained.

[0042] The rigidity value of the chemical warmer may be 4.0 to 12.0 N. From the perspective of further improving the effect, it is preferably 4.1 to 11.9 N, and more preferably 4.2 to 11.8 N. In the present disclosure, the rigidity value is a value measured by the following method. A rheometer is used as the measuring instrument. As shown in FIG. 1, the chemical warmer 1 is spanned between a pair of supports 2 with a width of 2.5 cm and a height of 2.5 cm. The distance between the supports 2 is 4 cm, and the length of the support 2 is made longer than the length of the chemical warmer 1. A pushing body 3 with a diameter of 10 mm is lowered from above the chemical warmer 1 spanned between the supports 2 at a speed of 60 mm / min and pushed into the chemical warmer 1. The position where the pushing body 3 is pushed in is the center of the chemical warmer 1. The pushing body 3 is pushed 20 mm from the upper surface of the chemical warmer 1, and the maximum value of the weight generated during the movement amount is taken as the rigidity value. The rigidity value of the chemical warmer can be adjusted to 4.0 to 12.0 N by appropriately adjusting the content of each component of the exothermic composition, the filling rate of the exothermic composition in the container, the material, thickness, basis weight, and flexural rigidity value of the moisture-permeable sheet and moisture-impermeable sheet, etc.

[0043] The chemical warmer of the present disclosure is packaged with a packaging material having oxygen barrier properties, and the exothermic composition is provided in a state where it does not come into contact with air. When the chemical warmer of the present disclosure is housed in a holder attached to the upper arm or thigh, the packaging material is opened, so that the exothermic composition comes into contact with air and heat generation starts. In a state of being housed in the pocket of the holder, the heat generation temperature is preferably 42 to 55 °C, more preferably 45 to 52 °C, and the heat generation duration is preferably 8 hours or more, more preferably 9 hours or more.

[0044] 2. A holder attached to the upper arm or thigh The holder for housing the chemical warmer of the present disclosure may be one that can be attached to the upper arm or thigh and has a pocket capable of housing the chemical warmer of the present disclosure, and the others are not particularly limited.

[0045] Examples of the holder for accommodating the chemical cairo of the present disclosure include a holding part having a pocket for accommodating the chemical cairo of the present disclosure, and a belt joined to the holding part so as to form an insertion space into which the upper arm or thigh is inserted between the holding part and the belt. The holding part is made of a material that does not substantially stretch or contract, and the belt is made of a material having elasticity so as to follow the change in the thickness of the upper arm accompanying the bending and stretching of the elbow, or the change in the thickness of the thigh accompanying the bending and stretching of the knee. A holder for a chemical cairo configured as such is exemplified.

[0046] Hereinafter, an embodiment of the holder for the chemical cairo will be described with reference to the drawings. FIG. 2 is a front view of a holder 10 for a chemical cairo according to an embodiment. FIG. 3 is a rear view of the holder 10 for a chemical cairo. FIG. 4 is a side view of the holder 10 for a chemical cairo. Hereinafter, in the front view of the holder 10 for a chemical cairo, the longitudinal direction of the holder 10 for a chemical cairo is referred to as the left-right direction, and in the front view, the direction orthogonal to the left-right direction is referred to as the up-down direction.

[0047] [Overall Configuration of Holder for Chemical Cairo] The holder 10 for a chemical cairo shown in FIGS. 2, 3, and 4 is worn on the user's upper arm 200 (see FIG. 5) or thigh (not shown) with the chemical cairo of the present disclosure accommodated therein. The main elements constituting the holder 10 for a chemical cairo are a holding part 20, a belt 30, and an adjustment part 40.

[0048] [Holding Part] The holding part 20 has a base part 21 and a pocket 22 attached to the base part 21. The material constituting the holding part 20 is made of a material that does not substantially stretch or contract even when the thickness of the upper arm 200 or thigh changes while the holding part 20 is worn on the user's upper arm 200 or thigh. The material constituting the holding part 20 is, for example, polyester, nylon, or cotton. In the present embodiment, not substantially stretching or contracting means, for example, when the fabric is stretched 1 cm in a predetermined direction, it breaks, or the length in the predetermined direction of the portion that returns to the state before stretching among the stretched portions is less than 95% (0.95 cm).

[0049] The shape of the base 21 can be arbitrarily selected. In the present embodiment, the base 21 has a shape in which portions corresponding to the four corners of a rectangle are chamfered in a front view. A pocket 22 for accommodating the chemical warmer 100 is attached to the surface 21A of the base 21. The pocket 22 is formed by attaching a fabric different from the fabric constituting the base 21 to the surface 21A of the base 21. The pocket 22 is sewn to the base 21 except for the portion where the opening 22B is formed, from the viewpoint of preventing the chemical warmer 100 from falling off. An accommodation space 22X for accommodating the chemical warmer 100 is formed between the inner surface 22A of the pocket 22 (see FIG. 4) and the surface 21A of the base 21. The accommodation space 22X communicates with the external space through the opening 22B. The chemical warmer 100 is taken in and out of the accommodation space 22X through the opening 22B.

[0050] The ratio RA of the maximum length LB in the left - right direction between the opening 22B of the pocket 22 and one end 21X of the base 21 to the maximum length LA in the left - right direction of the pocket 22 can be arbitrarily selected. When the length LA is longer than the length LB, the pocket 22 can be formed larger, so chemical warmers 100 of various sizes can be accommodated in the pocket 22. When the length LA is longer than the length LB, in the left - right direction, since the pocket 22 exists over a wide range, when the chemical warmer holder 10 is attached to the upper arm 200 or the thigh, the inside of the pocket 22 and the chemical warmer 100 accommodated in the pocket 22 curve along the upper arm 200 or the thigh. Since the chemical warmer 100 fits along the upper arm 200 or the thigh, the state in which the chemical warmer 100 is accommodated in the pocket 22 is easily maintained. Further, since the chemical warmer of the present disclosure has a rigidity value of 4.0 to 12.0 N at the start of heat generation, even if the thickness and shape of the upper arm 200 or the thigh change greatly as the elbow or knee bends and extends, it can sufficiently follow the change and fit along the upper arm 200 or the thigh, so no discomfort is caused from the start of heat generation to the end of heat generation.

[0051] <Belt> The belt 30 shown in FIG. 3 is, for example, rectangular, and is joined to the base 21 such that an insertion space 10A into which the upper arm 200 or the thigh is inserted is formed between the surface 30A (see FIG. 4) and the back surface 21B of the base 21. One end 31 of the belt 30 in the left-right direction is joined to one end 21X of the base 21 in the left-right direction. The other end 32 of the belt 30 in the left-right direction is joined to the other end 21Y of the base 21 in the left-right direction. The upper arm 200 or the thigh greatly changes in thickness as the elbow or knee bends and extends. Specifically, for example, the upper arm 200 is thicker when the elbow is bent than when the elbow is extended. For this reason, the belt 30 is configured of a stretch fabric including a stretchable material so as to be able to follow the change in the thickness of the upper arm 200 as the user bends and extends the elbow while being worn on the user's upper arm 200. The belt 30 stretches more when the user bends the elbow than when the user extends the elbow. The belt 30 stretches more as the angle formed by the forearm and the upper arm 200 becomes smaller. The belt 30 contracts more when the user extends the elbow than when the user bends the elbow. The belt 30 contracts more as the angle formed by the user's forearm and the upper arm 200 becomes larger. In the present embodiment, having stretchability means, for example, that when the fabric is stretched 1 cm in a predetermined direction, the length in the predetermined direction of the portion that returns to the state before stretching among the stretched portions is 95% (0.95 cm) or more. Even when the stretch fabric is configured to include a material that does not substantially stretch, the stretch fabric is configured to have stretchability as a whole. In the first example, the stretch fabric is configured of a single stretchable material. The stretchable material is, for example, polyurethane, natural rubber, or chloroprene rubber. In the second example, the stretch fabric is configured of a plurality of stretchable materials, or is configured to include a stretchable material and a material that does not substantially stretch. The material that does not substantially stretch is, for example, nylon. In the third example, the belt 30 is configured by laminating a stretch fabric and a non-stretch fabric that does not substantially stretch. The stretch fabric is the stretch fabric shown in the first example or the second example. The material constituting the non-stretch fabric is, for example, polyester. Even in the case of the third example, the belt 30 is configured to have stretchability as a whole.According to the second and third examples, the strength of the belt 30 is increased. Also, according to the second and third examples, the stretchability of the belt 30 can be arbitrarily adjusted. Note that the belt 30 only needs to have stretchability at least in the direction along the left - right direction, and furthermore, it may have stretchability in the direction intersecting the left - right direction in a front view.

[0052] The relationship between the maximum length LC of the belt 30 in the up - down direction and the maximum length LD of the base 21 in the up - down direction can be arbitrarily selected. Since the belt 30 is composed of a stretchable material, preferably, the length LC is preferably shorter than the length LD. When the length LC is shorter than the length LD, since the belt 30 can easily stretch, the options for the material constituting the belt 30 are expanded. In one example, the length LC is 5 cm and the length LD is 9 cm.

[0053] A loop 33 of a hook - and - loop fastener is attached to the back surface 30B of the belt 30. The hatched portion of the belt 30 in FIG. 3 indicates the region where the loop 33 exists. In the present embodiment, the loop 33 is arranged substantially over the entire belt 30 in the left - right direction.

[0054] <Adjusting portion> The adjusting portion 40 protrudes from the end 31 of the belt 30 and the end 21X of the base 21, and by joining with the belt 30, adjusts the length of the belt 30 wound around the upper arm 200 or the thigh. The adjusting portion 40 is, for example, in a rectangular shape with chamfers at the corners located on the side opposite to the belt 30. A hook 41 of a hook - and - loop fastener that joins with the loop 33 is attached to the back surface 40A of the adjusting portion 40. In FIG. 3, the hatched portion of the adjusting portion 40 indicates the region where the hook 41 exists. The hook 41 is arranged substantially over the entire back surface 40A of the adjusting portion 40.

[0055] The ratio RB of the maximum length LF of the adjustment part 40 in the left - right direction to the maximum length LE of the belt 30 in the left - right direction is arbitrarily selectable. Preferably, the ratio RB is preferably 17% or more so that the user can easily grasp the adjustment part 40 in a state where the upper arm 200 or the thigh is inserted into the insertion space 10A.

[0056] [Method of using the holder for chemical warmer] With reference to FIGS. 4 and 5, an example of the method of using the holder 10 for chemical warmer will be described.

[0057] As shown in FIG. 4, the chemical warmer 100 is stored in the storage space 22X through the opening 22B. For example, when attaching the holder 10 for chemical warmer to the upper arm 200, the user inserts into the insertion space 10A in the order of the hand, forearm, elbow, and upper arm 200. When the holder 10 for chemical warmer reaches the preferred position on the upper arm 200, the user pulls the hook 41 of the adjustment part 40 and joins it to the loop 33 of the belt 30 so that the holder 10 for chemical warmer does not shift with respect to the upper arm 200. The part of the belt 30 closer to the end 31 than the part joined to the adjustment part 40 is in a bent state and is located between the upper arm 200 and the back surface 21B of the base 21. Note that when adjustment of the length of the belt 30 by the adjustment part 40 is not necessary, the hook 41 and the loop 33 are not joined. When the holder 10 for chemical warmer is attached to the upper arm, the warming effect is imparted to the upper arm 200 through the back surface 21B of the base 21.

[0058] 3. Hand or foot coldness improver The hand or foot coldness improver of the present disclosure includes the chemical warmer of the present disclosure and a holder attached to the upper arm or thigh. According to the hand or foot coldness improver of the present disclosure, by warming the upper arm or thigh at an appropriate temperature for a long time, blood circulation in the hand or foot can be promoted, and coldness due to poor blood circulation can be alleviated.

Example

[0059] Hereinafter, the present disclosure will be specifically described by way of examples and the like, but the present disclosure is not limited thereto.

[0060] 1. Preparation of Chemical Chiro Moisture-permeable sheets A to D shown in Table 1 were prepared. The shape of each moisture-permeable sheet is as shown in Fig. 6. The moisture permeability of each moisture-permeable sheet was measured in accordance with JIS K 7129-5:2016 (Plastics - Films and Sheets - Method for Determining Water Vapor Transmission Rate - Part 5: Pressure Sensor Method). All of the prepared moisture-permeable sheets A to D are laminated sheets (thickness 60 μm, basis weight 30 g / m 2 ) in which a spunbond nonwoven fabric made of polyethylene terephthalate and a polyethylene film provided with pores are adhered by dry lamination, and the moisture permeability is controlled by the size and number of pores in the polyethylene film. Also, the bending rigidity value of each moisture-permeable sheet was measured using a pure bending tester (manufactured by Kato Tech Co., Ltd., KES-FB2S), with the sample being 10 cm square, the sample being gripped by chucks at 1 cm intervals, and a pure bending test being performed in the range of curvature -2.5 to +2.5 cm -1 at a deformation rate of 0.50 (cm -1 ).

[0061]

Table 1

[0062] Also, a moisture-impermeable sheet (aluminum-deposited polyethylene terephthalate sheet, thickness 76 μm) with a moisture permeability of 0 g / m 2 ·day and a bending rigidity value of 0.37 gf·cm 2 / cm was prepared. The moisture permeability of the moisture-impermeable sheet was measured in accordance with JIS K 7129-5:2016 (Plastics - Films and Sheets - Method for Determining Water Vapor Transmission Rate - Part 5: Pressure Sensor Method). The bending rigidity value of the moisture-impermeable sheet was measured using a pure bending tester (manufactured by Kato Tech Co., Ltd., KES-FB2S), with the sample being 10 cm square, the sample being gripped by chucks at 1 cm intervals, and a pure bending test being performed in the range of curvature -2.5 to +2.5 cm -1 at a deformation rate of 0.50 (cm -1 ). The shape of the moisture-impermeable sheet is as shown in Fig. 6.

[0063] In addition, a heat-generating composition having the composition shown in Table 2 was prepared. The prepared heat-generating composition was held between the moisture-permeable sheet and the moisture-impermeable sheet in the filling amounts shown in Tables 3 and 4. The moisture-permeable sheet was arranged such that the non-woven fabric side faced outward. In that state, the peripheral portions of both sheets were heat-sealed to produce a chemical warmer in which the heat-generating composition was housed in a container. The width W1 of the produced chemical warmer was 70 mm, and the length L1 was 90 mm. Also, the width W2 of the portion where the heat-generating composition was housed was 55 mm, and the length L2 was 75 mm. Further, the area of the portion where the heat-generating composition was housed was 37 cm 2 2.

[0064]

Table 2

[0065] The produced chemical warmer was quickly placed in and sealed with a gas-impermeable sealed bag. In the produced chemical warmer, the combination of the moisture-permeable sheet and the filling amount of the heat-generating composition is as shown in Tables 3 and 4.

[0066] 2. Measurement of the rigidity value of the chemical warmer The rigidity value of the produced chemical warmer was measured by the following method. As the measuring instrument, a rheometer (manufactured by Sun Scientific Co., Ltd., CR-500DX) was used. The chemical warmer was taken out from the sealed bag. Then, as shown in FIG. 1, the chemical warmer 1 was placed across a pair of supports 2 having a width of 2.5 cm and a height of 2.5 cm. The distance between the supports 2 was 4 cm, and the length of the supports 2 was made longer than the length of the chemical warmer 1. A push-in body 3 having a diameter of 10 mm was lowered from above the chemical warmer 1 placed between the supports 2 at a speed of 60 mm / min and pushed into the chemical warmer 1. The position where the push-in body 3 was pushed in was the center of the chemical warmer 1. The push-in body 3 was pushed in 20 mm from the upper surface of the chemical warmer 1, and the maximum value of the load generated during that movement amount was taken as the rigidity value (N). The results are shown in Tables 3 and 4.

[0067] 3. Evaluation of the usability The chemical warmer was taken out of the sealed bag and placed in the pocket of a holder (holding part: polyester, belt: nylon) worn on the upper arm shown in Fig. 1. Then, the holder was worn on the upper arms of six subjects, and a sensory evaluation was conducted using a questionnaire based on the VAS (Visual Analogue Scale). In the questionnaire, the left end of a 10-cm straight line was marked as "feeling uncomfortable with the chemical warmer during use", and the right end was marked as "not feeling uncomfortable with the chemical warmer during use". The subjects were asked to mark where the feeling when using each chemical warmer corresponded on the straight line. The distance from the left end of 0 cm of the marked position was used as the VAS measurement value. The average value of the six obtained VAS measurement values was calculated, and the usability was evaluated according to the following criteria. The results are shown in Tables 3 and 4. <Evaluation Criteria> A: 8 points or more B: 4 points or more and less than 8 points C: Less than 4 points

[0068] 4. Evaluation of the heat generation temperature In the above-mentioned "evaluation of usability", the heat generation temperature of the chemical warmer while the holder was worn on the upper arm was measured using a thermometer (manufactured by T&D Corporation), and the heat generation temperature was evaluated according to the following criteria. The results are shown in Tables 3 and 4. <Evaluation Criteria> A: The heat generation temperature is kept in the range of 42 to 55 °C (the heat generation temperature is sufficient and stable). B: The heat generation temperature is kept in the range of 39 to 42 °C (the heat generation temperature is insufficient but stable). C: The heat generation temperature becomes 38 °C or less or 56 °C or more (the heat generation temperature is too low or too high and unstable).

[0069] 5. Evaluation of temperature persistence In the above-mentioned "evaluation of usability", the duration of heat generation of the chemical warmer while the holder was worn on the upper arm was measured, and the temperature persistence was evaluated according to the following criteria. The results are shown in Tables 3 and 4. <Evaluation Criteria> A: 8 hours or more (the duration is sufficient.) B: 6 hours or more and less than 8 hours (the duration is slightly insufficient.) C: Less than 6 hours (the duration is insufficient.)

[0070]

Table 3

[0071]

Table 4

[0072] As shown in Tables 3 and 4, for the chemical warmers (Examples 1 to 4) using the moisture-permeable sheet with a moisture permeability of 400 to 650 g / m 2 ·day and having a rigidity value of 4.0 to 12.0 N, all aspects of the usability, heat generation temperature, and temperature sustainability were satisfactory. On the other hand, the chemical warmers using a moisture-permeable sheet outside the above numerical range and / or having a rigidity value outside the above numerical range (Comparative Examples 1 to 16) did not simultaneously satisfy all of the usability, heat generation temperature, and temperature sustainability. Here, regarding the moisture permeability of the moisture-permeable sheet and the filling rate of the exothermic composition, the chemical warmer of Comparative Example 5 corresponds to a type of chemical warmer that is attached to clothing, and the chemical warmer of Comparative Example 6 corresponds to a type of chemical warmer that is disposed on the sole of the foot and used.

Explanation of Reference Numerals

[0073] 1; Chemical warmer 2: Support 3: Pushing body 10: Holder for chemical warmer 10A: Insertion space 20: Holding part 22: Pocket 30: Belt 33: Loop 40: Adjusting part 41: Hook 100: Chemical warmer 200: Upper arm

Claims

1. A chemical warmer that is used by being housed in a holder attached to the upper arm or thigh, wherein the chemical warmer has a heat-generating composition containing an oxidizable metal housed in a container having a moisture-permeable sheet on at least one surface, the chemical warmer has a rigidity value at the start of heat generation of 4.0 to 12.0 N, the moisture-permeable sheet has a moisture permeability of 400 to 650 g / m 2 ·day, chemical warmer.

2. The moisture-permeable sheet has a flexural rigidity value of 1.0 to 2.0 gf·cm 2 / cm, the chemical warmer according to claim 1.

3. The container has a moisture-impermeable sheet on the other surface, and the moisture-impermeable sheet has a flexural rigidity value of 0.1 to 1.0 gf·cm 2 / cm, the chemical warmer according to claim 1.

4. A hand or foot coldness improver comprising the chemical warmer according to any one of claims 1 to 3 and a holder attached to the upper arm or thigh.

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