Heating Sheet

Abstract

To provide a thermal sheet capable of mitigating uncomfortable feeling at usage and making it hard to be peeled, and a manufacturing method of the same.SOLUTION: A thermal sheet 10 of the present invention includes: a base member 1; three heating compositions 3, 4, and 5 aligned and arranged apart from each other along an inner surface of the base member 1; a shielding member 2 arranged at an opposite side to the base member 1 of the three heating compositions 3, 4, and 5; a sealing unit 6 which hot-welds the base member 1 and the shielding member 2 at a continuing portion so as to surround the three heating compositions 3, 4, and 5; a first adhesive part 7a arranged on an outer surface 1a of the base member 1 while overlapping on a first heating composition 3 arranged at an end in an aligning direction among the three heating compositions 3, 4, and 5 along one edge of the first heating member 3; and a second adhesive part 7c arranged separately from the first adhesive part 7a on the outer surface 1a of the base member 1 while overlapping on the first heating composition 3 along one edge opposite to the one edge of the first heating member 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention is a heat sheet that is directly applied to the lower back, neck, etc. To Regarding. [Background technology]

[0002] The thermal sheet can be formed, for example, by sandwiching the heat-generating composition between two sheets and heat-welding the two sheets around the heat-generating composition. One side of the thermal sheet is provided with an adhesive layer for attaching the thermal sheet to the skin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-062336 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, if the adhesive layer is provided on the entire surface of the thermal sheet, the thermal sheet can be attached to the skin over a wide area, making it difficult to peel off. On the other hand, when the thermal sheet is attached to the skin, the breathability of the attached part is reduced, causing stuffiness, and the thermal sheet is difficult to follow the movement of the body, making it difficult to move the body, which can be uncomfortable. If the entire surface of the thermal sheet is attached to the skin for a long time, the risk of low-temperature burns increases.

[0005] By applying an adhesive to part of the surface of the thermal sheet and reducing the area of ​​the adhesive layer that adheres the thermal sheet to the skin, it is possible to improve breathability and reduce discomfort. However, while reducing the area of ​​the adhesive layer can prevent low-temperature burns and reduce discomfort, it also makes the thermal sheet more likely to peel off.

[0006] The present invention has been made in view of the above points, and provides a heat shield that can reduce discomfort during use and is less likely to peel off. To The purpose is to provide. [Means for solving the problem]

[0008] One embodiment of the thermal sheet of the present invention comprises a first sheet material, three heat generating compositions arranged in parallel and spaced apart from one another in a first direction along the first sheet material, a second sheet material arranged on the opposite side of the first sheet material from the three heat generating compositions, a seal portion formed by heat welding the first sheet material and the second sheet material in continuous areas surrounding each of the three heat generating compositions, a first adhesive portion provided on the outer surface of the first sheet material along an edge of one end of the first heat generating composition provided at one end of the three heat generating compositions in the first direction, overlapping the first heat generating composition, and a second adhesive portion provided on the outer surface of the first sheet material along an edge of one end of the first heat generating composition provided at one end of the first heat generating composition in the first direction. a second adhesive portion provided on the outer surface of the first sheet material overlapping the first heat-generating composition along the edge of the other end opposite the first direction; a third adhesive portion provided on the outer surface of the first sheet material overlapping the second heat-generating composition along the edge of the other end of the second heat-generating composition provided at the other end in the first direction of the three heat-generating compositions; a fourth adhesive portion provided on the outer surface of the first sheet material overlapping the second heat-generating composition along the edge of one end of the second heat-generating composition separately from the third adhesive portion; and a fifth adhesive portion provided on the outer surface of the first sheet material overlapping the third heat-generating composition between the first and second heat-generating compositions. The first and second exothermic compositions are larger in size than the third exothermic composition, the width in the first direction of the first adhesive portion is larger than the width in the first direction of the second adhesive portion, and the width in the first direction of the third adhesive portion is larger than the width in the first direction of the fourth adhesive portion. Effect of the Invention

[0010] According to one aspect of the present invention, a heat seal that can reduce discomfort during use and is less likely to peel off is provided. To can be provided. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a plan view showing a thermal sheet according to a first embodiment of the present invention. [Diagram 2]FIG. 2 is a cross-sectional view of the thermal sheet of FIG. 1 taken along the line F2-F2. [Diagram 3] FIG. 3 is a flow chart for explaining a method for producing the thermal sheet of FIG. [Figure 4] FIG. 4 is a graph showing the results of a questionnaire regarding the usability of the thermal sheet of FIG. [Diagram 5] FIG. 5 is a graph showing the results of a questionnaire regarding the adhesive strength of the thermal sheet of FIG. [Figure 6] FIG. 6 is a graph showing the results of a questionnaire regarding the difficulty of peeling off the thermal sheet of FIG. [Figure 7] FIG. 7 is a plan view showing a thermal sheet according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a plan view of a thermal sheet 10 according to a first embodiment, seen from the outer surface 1a side of a substrate 1. Fig. 2 shows an example of a state in which the thermal sheet 10 is attached to a person's shoulder, and shows a cross section of the thermal sheet 10 cut along F2-F2 in Fig. 1.

[0013] As shown in Figures 1 and 2, the thermal sheet 10 of the first embodiment has a substrate 1, a covering material 2, three heat generating compositions 3, 4, 5 arranged side by side and spaced apart between the substrate 1 and the covering material 2, a sealing portion 6 that seals the substrate 1 and the covering material 2 at continuous portions so as to surround the periphery of each of the heat generating compositions 3, 4, 5, and seven striped adhesive portions 7a, 7b, 7c, 7d, 7e, 7f, 7g provided on the outer surface 1a of the substrate 1.

[0014] The substrate 1 and the covering material 2 have the same outer shape, which is a substantially oval shape. The three heat generating compositions 3, 4, and 5 are arranged in a line spaced apart from each other in the longitudinal direction (first direction) of the substantially oval heat generating sheet 10. The seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g are spaced apart from each other in the longitudinal direction of the heat generating sheet 10 and extend in the lateral direction of the heat generating sheet 10. The outer edges of the three heat generating compositions 3, 4, and 5 are shown by dashed lines in FIG. 1. The seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g are provided on the outer surface 1a of the substrate 1 inside the dashed lines that overlap the three heat generating compositions 3, 4, and 5.

[0015] The substrate 1 functions as a first sheet material of the present invention, and the covering material 2 functions as a second sheet material of the present invention. Of the three heat generating compositions 3, 4, and 5, the heat generating composition 3 at one end (the left end in the figure) in the arrangement direction (the left-right direction in the figure, the first direction) functions as the first heat generating composition of the present invention, the heat generating composition 5 at the other end in the arrangement direction (the right end in the figure) functions as the second heat generating composition of the present invention, and the central heat generating composition 4 functions as the third heat generating composition of the present invention.

[0016] Of the seven adhesive portions 7a, 7b, 7c, 7d, 7e, 7f, and 7g, the adhesive portion 7a on the left side in the figure functions as the first adhesive portion of the present invention, the adhesive portion 7c third from the left functions as the second adhesive portion of the present invention, the adhesive portion 7g on the right side in the figure functions as the third adhesive portion of the present invention, the adhesive portion 7e third from the right functions as the fourth adhesive portion of the present invention, and the central adhesive portion 7d functions as the fifth adhesive portion of the present invention.

[0017] The thermal sheet 10 is used by directly attaching it to a person's shoulder, neck, stomach, etc. The thermal sheet 10 can also be attached to clothing. When attaching the thermal sheet 10 to the shoulder, for example, as shown in Figure 2, the outer surface 1a of the substrate 1 faces the skin, and the three heat generating compositions 3, 4, 5 are aligned in the direction of the shoulder's curvature.

[0018] The heat generation amount of the thermal sheet 10 can be adjusted by changing the compounding ratio and amount of the materials of the heat generation compositions 3, 4, and 5. In this embodiment, the amounts of the heat generation compositions 3, 4, and 5 are made different to give different heat generation amounts to the heat generation compositions 3, 4, and 5. Specifically, the thicknesses of the three heat generation compositions 3, 4, and 5 are made approximately the same, but the areas of the heat generation compositions 3, 4, and 5 are made different. This makes the heat generation amount of the heat generation compositions 3 and 5 at both ends in the arrangement direction of the heat generation compositions 3, 4, and 5 greater than the heat generation amount of the heat generation composition 4 in the center.

[0019] The heat generating compositions 3, 4, and 5 are formed products containing iron powder, a carbon component, a reaction accelerator, and water. In order to impart formability to the heat generating compositions 3, 4, and 5, excess water not used in the heat generating reaction or a thickener may be added. At least one additional component selected from a water retention agent, a water-absorbent polymer, a pH adjuster, a hydrogen generation inhibitor, an aggregate, a fibrous material, a surfactant, a hydrophobic polymer compound, a heat generating assistant, a metal other than iron, a metal oxide other than iron oxide, an acidic substance, or a mixture thereof may be added to the heat generating compositions 3, 4, and 5.

[0020] The mixing ratio of the materials of the heat generating compositions 3, 4, and 5 is not particularly limited, but can be 1.0 to 50 parts by mass of reaction accelerator, 1.0 to 60 parts by mass of water, 1.0 to 50 parts by mass of carbon component, 0.01 to 10 parts by mass of water retention agent, 0.01 to 20 parts by mass of water absorbent polymer, 0.01 to 5 parts by mass of pH adjuster, and 0.01 to 12 parts by mass of hydrogen generation inhibitor relative to 100 parts by mass of iron powder.

[0021] The following may be added to heat-generating compositions 3, 4, and 5 in the following mixing ratios per 100 parts by mass of iron powder: 1.0 to 50 parts by mass of metal other than iron, 1.0 to 50 parts by mass of metal oxide other than iron oxide, 0.01 to 5 parts by mass of surfactant, 0.01 to 10 parts by mass each of hydrophobic polymer compound, aggregate, and fibrous material, 0.01 to 10 parts by mass of heat-generating assistant, and 0.01 to 1 part by mass of acidic substance.

[0022] The content of water in the heat-generating compositions 3, 4 and 5 is 7 to 60% by mass, preferably 10 to 50% by mass, and more preferably 20 to 50% by mass.

[0023] There are no limitations on the carbon component as long as it is made of carbon. Examples include carbon black, graphite, activated carbon, etc. Examples include activated carbon prepared from coconut shells, wood, charcoal, coal, bone charcoal, etc., and activated carbon prepared from other raw materials such as animal products, natural gas, fats, oils, and resins. In particular, activated carbon with adsorption and retention capabilities is preferred. The carbon component does not necessarily have to exist alone, and when iron powder containing and / or coated with a carbon component is used in the heat generating compositions 3, 4, and 5, the heat generating compositions 3, 4, and 5 are considered to contain a carbon component even if the carbon component does not exist alone.

[0024] The reaction accelerator is not limited as long as it can accelerate the reaction of the heat generating compositions 3, 4, and 5. Examples of the reaction accelerator include metal halides, nitrates, acetates, carbonates, and metal sulfates. Examples of the metal halides include sodium chloride, potassium chloride, magnesium chloride, calcium chloride, ferrous chloride, ferric chloride, sodium bromide, potassium bromide, ferrous bromide, ferric bromide, sodium iodide, and potassium iodide. Examples of the nitrates include sodium nitrate and potassium nitrate. Examples of the acetates include sodium acetate. Examples of the carbonates include ferrous carbonate. Examples of the metal sulfates include potassium sulfate, sodium sulfate, and ferrous sulfate.

[0025] There are no limitations on the water retention agent as long as it can retain water. Examples include wood flour, pulp flour, activated carbon, sawdust, cotton cloth with a lot of fluff, cotton staple fiber, paper waste, plant materials and other plant-based porous materials with large capillary function and hydrophilicity, activated clay, magnesium silicate clay minerals such as zeolite, perlite, vermiculite, silica-based porous materials, coral fossils, volcanic ash-based materials (terra balloons, shirasu balloons, Taisetsu balloons, etc.), etc. In order to increase the water retention capacity of these water retention agents, they may be processed by firing and / or pulverization.

[0026] The water-absorbing polymer is not particularly limited as long as it is a resin having a cross-linked structure and an ion-exchange water absorption rate of 3 times or more of its own weight. The surface may be cross-linked. The water-absorbing polymer may be a commercially available product.

[0027] Examples of water-absorbing polymers include poly(meth)acrylic acid crosslinked bodies, poly(meth)acrylic acid salt crosslinked bodies, poly(meth)acrylic acid ester crosslinked bodies having sulfonic acid groups, poly(meth)acrylic acid ester crosslinked bodies having polyoxyalkylene groups, poly(meth)acrylamide crosslinked bodies, copolymer crosslinked bodies of (meth)acrylic acid salts and (meth)acrylamide, copolymer crosslinked bodies of (meth)acrylic acid hydroxyalkyl and (meth)acrylic acid salts, polydioxolane crosslinked bodies, crosslinked polyethylene oxide, crosslinked polyvinylpyrrolidone, sulfonated polystyrene crosslinked bodies, crosslinked polyvinylpyridine, saponified starch-poly(meth)acrylonitrile graft copolymers, starch-poly(meth)acrylic acid (salt) graft crosslinked copolymers, reaction products of polyvinyl alcohol and maleic anhydride (salt), crosslinked polyvinyl alcohol sulfonate salts, polyvinyl alcohol-acrylic acid graft copolymers, polyisobutylene maleic acid (salt) crosslinked polymers, etc. These may be used alone or in combination of two or more kinds.

[0028] The water-absorbent polymer having biodegradability in the water-absorbent polymer is not limited as long as it is a water-absorbent polymer having biodegradability. Examples of such water-absorbent polymers include polyethylene oxide crosslinked body, polyvinyl alcohol crosslinked body, carboxymethyl cellulose crosslinked body, alginic acid crosslinked body, starch crosslinked body, polyamino acid crosslinked body, polylactic acid crosslinked body, etc.

[0029] There are no limitations on the pH adjuster as long as it can adjust the pH. There are weak acid salts and hydroxides of alkali metals, weak acid salts and hydroxides of alkaline earth metals, etc. 2 CO 3 , NaHCO 3 , Na 3 PO 4 , Na 2HPO 4 , Na 5 P 3 O 10 , NaOH, KOH, Ca(OH) 2 , Mg(OH) 2 , Ca 3 (PO 4 ) 2 The following are some examples.

[0030] There is no limitation on the hydrogen generation inhibitor as long as it inhibits hydrogen generation. Examples include at least one or more selected from the group consisting of sulfur compounds, oxidizing agents, alkaline substances, sulfur, antimony, selenium, phosphorus, and tellurium. Examples of sulfur compounds include compounds with alkali metals or alkaline earth metals, such as metal sulfides such as calcium sulfide, metal sulfites such as sodium sulfite, and metal thiosulfates such as sodium thiosulfate.

[0031] Examples of the oxidizing agent include nitrates, oxides, peroxides, halogenated oxygen acid salts, permanganates, and chromates.

[0032] There are no limitations on the aggregate as long as it is useful as a filler and / or useful for making the heat generating compositions 3, 4, and 5 porous. Examples of the aggregate include fossil coral (coral fossils, weathered reef-building coral, etc.), bamboo charcoal, binchotan charcoal, silica-alumina powder, silica-magnesia powder, kaolin, crystalline cellulose, colloidal silica, pumice, silica gel, silica powder, mica powder, clay, talc, powder or pellet of synthetic resin, foamed synthetic resin such as foamed polyester and polyurethane, seaweed earth, alumina, cellulose powder, etc. Note that kaolin and crystalline cellulose are not included in the heat generating compositions 3, 4, and 5.

[0033] Examples of fibrous materials include inorganic and / or organic fibrous materials, such as rock wool, glass fiber, carbon fiber, metal fiber, pulp, paper, nonwoven fabric, woven fabric, natural fibers such as cotton and hemp, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, synthetic fibers, and pulverized products thereof.

[0034] The surfactant includes anionic, cationic, nonionic and amphoteric surfactants. In particular, nonionic surfactants are preferred, and examples of such surfactants include polyoxyethylene alkyl ethers, alkylphenol-ethylene oxide adducts, and higher alcohol phosphate esters.

[0035] The hydrophobic polymer compound is not limited as long as it has a contact angle with water of 40° or more, more preferably 50° or more, and even more preferably 60° or more in order to improve water drainage in the composition. There is no limitation on the shape, and examples thereof include powder, granules, grains, tablets, etc. Examples thereof include polyolefins such as polyethylene and polypropylene, polyesters, polyamides, etc.

[0036] Heat generating agents include metal powders, metal salts, and metal oxides, such as Cu, Mn, and CuCl. 2 , FeCl 2 Examples of the metal oxide other than iron oxide include manganese dioxide, cupric oxide, iron oxide, and mixtures thereof. Examples of the metal oxide other than iron oxide include manganese dioxide and cupric oxide.

[0037] The acidic substance may be any of inorganic acids, organic acids, and acid salts, and examples thereof include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, citric acid, malic acid, maleic acid, chloroacetic acid, iron chloride, iron sulfate, iron oxalate, iron citrate, aluminum chloride, ammonium chloride, and hypochlorous acid.

[0038] The iron powder includes not only ordinary iron powder, but also iron alloy powder, and iron powder or iron alloy powder having an oxygen-containing film on at least a part of the surface of the iron powder. Examples of the iron powder that can be used include cast iron powder, atomized iron powder, electrolytic iron powder, reduced iron powder, sponge iron powder, and iron alloy powders and mixtures thereof. Furthermore, these iron powders may contain carbon and oxygen, and may contain iron containing 50% or more of iron and other metals. The type of metal contained as an alloy or the like is not particularly limited as long as the iron component functions as a component of the heat generating compositions 3, 4, and 5, and examples thereof include metals and semiconductors such as aluminum, manganese, copper, nickel, silicon, cobalt, palladium, and molybdenum. These metals and alloys may be present only on the surface or only inside, or both on the surface and inside.

[0039] The heat-generating compositions 3, 4, and 5 may contain water-soluble polymers, aggregation aids, flocculation aids, agglomeration aids, dry binding materials, dry binders, adhesive materials, thickeners, excipients, flocculants, and soluble adhesive materials, provided that the addition of these ingredients does not affect the temperature rise characteristics.

[0040] Since the exothermic compositions 3, 4, and 5 are distributed in a state in which they can be stored for a long period of time in an outer bag (not shown) that is an air-impermeable storage bag, it is preferable that they contain a hydrogen generation inhibitor.

[0041] The shape of the heat generating compositions 3, 4, and 5 may be curved or curved, with rounded corners, or may have a recess in the center. The size (i.e., heat generation amount) of the heat generating compositions 3, 4, and 5 is smaller for the heat generating composition 4 in the center than for the heat generating compositions 3 and 5 at the ends in the arrangement direction. By making the heat generating composition 4 in the center smaller, the heat generating sheet 10 can fit the shoulder when it is used by attaching the heat generating compositions 3, 4, and 5 in the arrangement direction from the front to the back of the shoulder along the curve. In addition, the heat generating composition 4 in the center is less likely to cool and is more likely to be kept warm than the heat generating compositions 3 and 5 at the ends in the arrangement direction, so that the three heat generating compositions 3, 4, and 5 can be kept at the same temperature for a certain period of time.

[0042] These heat generating compositions 3, 4, and 5 are laminated by molding on the inner surface of the substrate 1 that does not have a storage pocket. Then, the covering material 2 is placed on top of the heat generating compositions 3, 4, and 5, and the substrate 1 and the covering material 2 are heat-welded at the portions surrounding the heat generating compositions 3, 4, and 5. For this reason, it is preferable that at least one of the substrate 1 and the covering material 2 is a laminate of a fibrous material formed from a thermoplastic resin and a film-like material formed from a thermoplastic resin. The film-like material is at least one layer that is a constituent layer of the substrate 1 or the covering material 2, and examples of the fibrous material include nonwoven fabrics and woven fabrics.

[0043] If the exothermic compositions 3, 4, 5 have a certain degree of moldability, the shapes of the exothermic compositions 3, 4, 5 are maintained until the exothermic compositions 3, 4, 5 are at least covered by the covering material 2 and a seal portion 6 is formed between the substrate 1 and the covering material 2. Therefore, the exothermic compositions 3, 4, 5 can be sealed at the outer edge side of their peripheral portions in a desired shape, and since crumbled pieces of the exothermic compositions 3, 4, 5, so-called sesame seeds, are not scattered in the seal portion 6, a good seal can be achieved without seal breaks.

[0044] Moreover, for example, an olefin-based film or the like can be used as the substrate 1. For example, a PET spunlace or the like can be used as the covering material 2. The breathable portion may be the substrate 1 side, the covering material 2 side, or both.

[0045] There are no restrictions on breathability as long as heat generation can be maintained. When used for normal heat generation, the breathability is usually 50 to 10,000 g / m2 in terms of moisture permeability according to the Lyssy method. 2 / 24hr, preferably 70 to 5,000g / m 2 / 24hr, more preferably 100 to 2,000g / m 2 / 24hr, more preferably 100 to 700g / m 2 / 24hr.

[0046] If the moisture permeability is less than 50, the amount of heat generated will be small and sufficient warming effect will not be obtained, which is not preferable.2 If it exceeds 24 hours, the heat generation temperature will become too high and safety issues may arise. However, depending on the application, it is possible to exceed 10,000g / m 2 There is no restriction on using the product with a moisture permeability exceeding 24 hours or, in some cases, a moisture permeability close to that of an open system.

[0047] The elongation rate of the substrate 1 (based on JIS standard L1096 8.14) can be, for example, 2.5% in the TD direction and 2% in the MD direction for a 60 mm wide sample. The elongation rate of the covering material 2 (based on JIS standard L1096 8.14) can be, for example, 4.1% in the TD direction and 2% in the MD direction for a 60 mm wide sample.

[0048] At least one of the substrate 1 and the covering material 2 (hereinafter also referred to as "packaging material") preferably has a weight of 400 g / mm 2 More preferably, 500g / mm 2 More preferably, 1000 g / mm 2 More preferably, 2000 g / mm 2 The packaging material is made of a material having a breaking strength of at least 100 μm. The thickness of the packaging material is not limited as long as the breaking strength is ensured, but is preferably at least 10 μm, more preferably 10 to 500 μm, even more preferably 10 to 300 μm, even more preferably 10 to 250 μm, and even more preferably 50 to 250 μm.

[0049] A preferred example of the packaging material is a laminate of a nonwoven fabric and a film-like material of a thermoplastic resin. At least one packaging material is a laminate of a fibrous material and a film-like material, and is a flexible material that can be heat-sealed. In the thermal sheet 10 using the packaging material for at least one of the substrate 1 or the covering material 2, the heat-generating compositions 3, 4, and 5 are laminated on a substantially planar substrate 1, covered with the covering material 2, and the peripheral portions of the heat-generating compositions 3, 4, and 5 are heat-sealed to form a sealed portion 6. When the packaging material is used for the covering material 2, it is flexible and has a firmness, and can reliably cover the heat-generating compositions 3, 4, and 5. Furthermore, during heat sealing, the covering material 2 does not break due to the temperature during heat sealing, and there is no seal breakage, and a reliable heat-sealed portion can be formed.

[0050] The heat seal material constituting the heat seal layer may be a single material or a composite material having a heat seal layer, and there is no limitation as long as it can be at least partially bonded by heating. Examples include ethylene-based hot melt resins such as polyolefins and olefin copolymer resins such as polyethylene and polypropylene, ethylene-vinyl acetate copolymer resins, and ethylene-acrylic acid ester copolymer resins such as ethylene-isobutyl acrylate copolymer resins, polyamide-based hot melt resins, butyral-based hot melt resins, polyester-based hot melt resins, polyamide-based hot melt resins, polyester-based hot melt resins, polymethyl methacrylate-based hot melt resins, polyvinyl ether-based hot melt resins, polyurethane-based hot melt resins, polycarbonate-based hot melt resins, vinyl acetate, and vinyl chloride-vinyl acetate copolymers, and hot melt resins and films and sheets thereof. In addition, hot melt resins and films and sheets thereof containing various additives such as antioxidants can also be used. In particular, low-density polyethylene and polyethylene using a metallocene catalyst are useful.

[0051] As the nonwoven fabric, there can be used vegetable fibers such as pulp, hemp, cotton, rayon, acetate, etc., synthetic pulp made from polyethylene, etc., and monofilaments and composite fibers of thermoplastic polymeric substances such as polyethylene, polypropylene, copolymers mainly made of propylene or ethylene, polyolefins aiming at self-bonding type such as propylene-ethylene-butene ternary random copolymers, polyamides such as nylon 6, polyesters such as polyethylene terephthalate, etc., mixed fibers of these, and mixtures of cellulose fiber pulp, etc. Although short fiber nonwoven fabric, long fiber nonwoven fabric, and continuous filament nonwoven fabric can be used as the nonwoven fabric, long fiber nonwoven fabric and continuous filament nonwoven fabric are preferable from the viewpoint of mechanical properties.

[0052] Furthermore, the film on the side that comes into contact with the skin of the human body, such as the substrate 1 constituting the thermal sheet 10, may be provided with water absorbency to absorb secretions such as sweat, or may be impregnated with moisture in advance to supply moisture to the skin.Specific examples of the film include a film in which absorbent paper, woven fabric, nonwoven fabric, or foam sheet is laminated in the middle layer of the film, or a film in which paper, woven fabric, nonwoven fabric, or foam sheet carrying a water-absorbing polymer or a water-retaining agent such as bentonite is laminated.

[0053] The substrate 1 and the covering material 2 may be transparent, opaque, colored, or uncolored. Symbols, pictures, photographs, diagrams, patterns, etc. may be provided on the outer surfaces of the substrate 1 and the covering material 2. A heat-relieving sheet may be provided on the outer surface 1a of the substrate 1 where the heating sheet 10 comes into contact with the skin.

[0054] In addition, the thermal sheet 10 is stored and transported sealed in an airtight, non-breathable storage bag (outer bag).One example is a thermal sheet 10 in which the manufactured thermal sheet 10 is sandwiched between two non-breathable films or sheets, and simultaneously with or after this sandwiching, the two films or sheets are punched out to a size larger than the thermal sheet 10, and simultaneously with or before this punching, the two films or sheets are sealed together around the peripheral portion that exceeds the size of the thermal sheet 10.

[0055] There are no other restrictions on the outer bag as long as it is non-breathable, and it may be laminated, and usually one made of a non-breathable material is used. Note that the heating sheet 10 can be folded or rolled up between the heat generating compositions 3, 4, and 5 and enclosed in the outer bag to make it very compact, which is convenient as it saves on the outer bag and provides excellent portability.

[0056] The substrate 1 of the thermal sheet 10 has adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g (hereinafter sometimes collectively referred to as adhesive parts 7) on its outer surface 1a for adhering to the skin or clothing. There are no particular limitations on the material constituting the adhesive parts 7 as long as it allows the thermal sheet 10 to be attached to the body or clothing, but for example, a SIS-based adhesive (thickness: 38 μm) can be used. There are also no particular limitations on the adhesive strength, but it can be in the range of 0.18 to 2.5 kgf / 25 mm, for example.

[0057] There are no particular limitations on how the thermal sheet 10 of this embodiment can be used, but it can be used to relieve symptoms such as stiff shoulders, lower back pain, and muscle fatigue, and to relieve muscle and tendon tension that inhibits the flow of energy and blood. In addition, the thermal sheet 10 may contain a magnetic substance such as a magnet to give it the function of improving blood circulation and alleviating stiff shoulders through a magnetic effect.

[0058] In addition, at least one of the heat generating compositions 3, 4, and 5, the substrate 1, and the covering material 2 may be subjected to a pressure treatment or may have an uneven surface formed thereon, thereby preventing the heat generating compositions 3, 4, and 5 from moving between the substrate 1 and the covering material 2.

[0059] The adhesive portion 7 may contain at least one selected from the group consisting of water retention agents, water-absorbent polymers, pH adjusters, surfactants, organosilicon compounds, hydrophobic polymer compounds, antioxidants, aggregates, fibrous materials, moisturizers, functional substances, and mixtures thereof. The adhesive portion 7 is classified into non-hydrophilic adhesives, mixed adhesives, and hydrophilic adhesives (gels, etc.).

[0060] The adhesive constituting the adhesive portion 7 is not limited as long as it has the adhesive strength required to adhere to the skin or clothes, and various forms such as solvent-based, water-based, emulsion-type, hot melt-type, reactive, pressure-sensitive, non-hydrophilic adhesives, and hydrophilic adhesives can be used. A non-hydrophilic adhesive layer containing a water-absorbent polymer or water-retaining agent to improve water absorption is treated as a non-hydrophilic adhesive layer. A hot melt-type adhesive may be provided between the hydrophilic adhesive layer and the substrate 1. In addition, there is no restriction on when the hydrophilic adhesive is provided on the heating element, and the hydrophilic adhesive layer may be provided on the heating sheet 10 after the seal portion 6 is provided.

[0061] Examples of adhesives constituting the non-hydrophilic adhesive layer include acrylic adhesives, vinyl acetate adhesives (vinyl acetate resin emulsions, ethylene-vinyl acetate resin hot melt adhesives), polyvinyl alcohol adhesives, polyvinyl acetal adhesives, vinyl chloride adhesives, polyamide adhesives, polyethylene adhesives, cellulose adhesives, chloroprene (neoprene) adhesives, nitrile rubber adhesives, polysulfide adhesives, butyl rubber adhesives, silicone rubber adhesives, styrene adhesives (e.g., styrene hot melt adhesives), rubber adhesives, silicone adhesives, etc. Among these, it is desirable to use adhesives containing rubber adhesives, acrylic adhesives, or hot melt polymer substances, which have high adhesive strength, are inexpensive, have good long-term stability, and exhibit little decrease in adhesive strength even when exposed to heat.

[0062] The adhesive of the adhesive portion 7 may be appropriately blended with other components, for example, tackifiers such as petroleum resins represented by rosins, coumarone-indene resins, hydrogenated petroleum resins, maleic anhydride modified rosin, rosin derivatives, and alicyclic petroleum resins such as C5 petroleum resins, phenolic tackifiers such as terpene phenolic resins, rosin phenolic resins, and alkylphenolic resins (particularly tackifiers having an aniline point of 50°C or less), softeners such as coconut oil, castor oil, olive oil, camellia oil, and liquid paraffin, softeners, anti-aging agents, fillers, aggregates, adhesion regulators, adhesion improvers, colorants, defoamers, thickeners, modifiers, and the like to improve the adhesion to nylon clothing and blended fabric clothing.

[0063] Examples of hot melt adhesives include known hot melt adhesives that have been given adhesive properties, and specifically include styrene adhesives that use an A-BA type block copolymer such as SIS, SBS, SEBS, or SIPS as the base polymer, vinyl chloride adhesives that use vinyl chloride resin as the base polymer, polyester adhesives that use polyester as the base polymer, polyamide adhesives that use polyamide as the base polymer, acrylic adhesives that use acrylic resin as the base polymer, polyolefin adhesives that use polyolefins such as polyethylene, ultra-low density polyethylene, polypropylene, ethylene-α-olefin, and ethylene-vinyl acetate copolymer as the base polymer, 1,2-polybutadiene adhesives that use 1,2-polybutadiene as the base polymer, polyurethane adhesives that use polyurethane as the base polymer, or adhesives made of modified products of these that have been modified to improve adhesion or stability, or mixtures of two or more of these adhesives. Foamed adhesives and crosslinked adhesives can also be used.

[0064] Hot melt adhesives include non-aromatic hot melt adhesives and aromatic hot melt adhesives. There are no limitations on the non-aromatic hot melt adhesives as long as the base polymer is a hot melt adhesive that does not contain an aromatic ring. Examples include olefin hot melt adhesives and acrylic hot melt adhesives. Non-aromatic polymers that are base polymers that do not contain an aromatic ring include polymers and copolymers of olefins and dienes. One example is an olefin polymer. An olefin polymer is a polymer or copolymer of ethylene and α-olefins. In addition, a diene such as butadiene or isoprene may be added as another monomer. There are no limitations on the α-olefin as long as it is a monomer with a double bond at the terminal, and examples include propylene, butene, heptene, hexene, octene, etc.

[0065] An aromatic hot melt adhesive is a hot melt adhesive whose base polymer contains an aromatic ring, and examples thereof include styrene-based hot melt adhesives, such as ABA block copolymers. In ABA block copolymers, the A block is a monovinyl-substituted aromatic compound A such as styrene or methylstyrene, which is a non-elastic polymer block, and the B block is an elastic polymer block of a conjugated diene such as butadiene or isoprene. Specific examples include styrene-butadiene-styrene block copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), or hydrogenated types thereof (SEBS, SIPS), and may also be used in combination.

[0066] As a measure to prevent a decrease in adhesive strength due to an increase in moisture in the non-hydrophilic adhesive layer, an adhesive layer in which a water-absorbing polymer is further blended with a non-hydrophilic adhesive can also be used. The hydrophilic adhesive constituting the hydrophilic adhesive layer is not particularly limited as long as it contains a hydrophilic polymer or a water-soluble polymer as a main component, has adhesiveness, and is hydrophilic as an adhesive.

[0067] Constituents of hydrophilic adhesives include hydrophilic polymers such as polyacrylic acid, water-soluble polymers such as sodium polyacrylate and polyvinylpyrrolidone, crosslinking agents such as dried aluminum hydroxide and metal aluminometasilicate, softeners such as glycerin and propylene glycol, higher hydrocarbons such as light liquid paraffin and polybutene, primary alcohol fatty acid esters such as isopropyl myristate, silicon-containing compounds such as silicone oil, fatty acid glycerin esters such as monoglycerides, and vegetable oils such as olive oil, and other oil-based components. Other examples include preservatives such as methyl paraoxybenzoate and propyl paraoxybenzoate, solubilizers such as N-methyl-2-pyrrolidone, thickeners such as carboxymethylcellulose, surfactants such as polyoxyethylene hydrogenated castor oil and sorbitan fatty acid esters, oxycarboxylic acids such as tartaric acid, light anhydrous silicic acid, water-absorbing polymers, excipients such as kaolin, moisturizers such as D-sorbitol, stabilizers such as sodium edetate, paraoxybenzoic acid esters and tartaric acid, crosslinked water-absorbing polymers, boron compounds such as boric acid, water, etc. The hydrophilic adhesive may be composed of any combination of these.

[0068] When the adhesive portion 7 is formed from a hydrophilic adhesive, if there is a difference in moisture retention between the hydrophilic adhesive and the heat generating compositions 3, 4, 5, moisture will move through the base material 1 between them, causing inconvenience to both. This type of inconvenience is particularly prevalent during storage of the heating sheet 10. To prevent this, the base material 1 between them must have a moisture permeability of at least 2 g / m2 according to the Lyssy method. 2 / day or less. By using such a substrate 1, when the thermal sheet 10 is stored in an outer bag that is a non-breathable storage bag, moisture migration can be prevented.

[0069] When a hydrophilic adhesive is used for the adhesive portion 7, the moisture permeability of the substrate 1 provided between the heat generating compositions 3, 4, and 5 and the adhesive portion 7 is not limited as long as the moisture transfer can be prevented to a degree that does not affect the heat generating performance under the conditions of atmospheric pressure, 40° C., and 90% RH. However, the moisture permeability according to the Lyssy method is usually 2.0 g / m2 / day or less, preferably 1.0 g / m 2 / day or less, more preferably 0.5 g / m 2 / day or less, and more preferably 0.01 to 0.5 g / m 2 The moisture-proof packaging material may be used as the substrate 1 or the covering material 2, or may be laminated on the substrate 1 or the covering material 2, etc.

[0070] The moisture-proof substrate 1 is not limited as long as it can prevent moisture transfer between the heat-generating compositions 3, 4, and 5 and the adhesive portion 7, and examples thereof include metal deposition films, metal oxide deposition films, metal foil laminated films, EVOH (ethylene-vinyl alcohol copolymer, saponified ethylene-vinyl acetate copolymer)-based films, biaxially oriented polyvinyl alcohol films, polyvinylidene chloride coated films, polyvinylidene chloride coated films obtained by applying polyvinylidene chloride to a substrate film such as polypropylene, metal foils such as aluminum foil, non-breathable packaging materials obtained by vacuum-depositing or sputtering metals such as aluminum on a polyester film substrate, and packaging laminates using transparent barrier films having a structure in which silicon oxide or aluminum oxide is provided on a flexible plastic substrate. Such films can also be used for non-breathable packaging materials used in outer bags, etc.

[0071] When the adhesive portion 7 is formed using a water-containing hydrophilic adhesive (such as a gel), in order to adjust the moisture balance between the heat generating compositions 3, 4, 5 and the hydrophilic adhesive, the content of reaction accelerators such as sodium chloride and substances with moisture-retaining properties such as water-absorbing polymers in the heat generating compositions 3, 4, 5 may be adjusted so that the difference in critical humidity is 2% or less compared to the heat generating compositions 3, 4, 5.

[0072] Here, the critical humidity refers to the humidity at which the hydrophilic adhesive (gel, etc.) and the heat-generating compositions 3, 4, and 5 reach moisture equilibrium in an environment with an arbitrarily set humidity at 30±3° C. In other words, the difference in critical humidity being 2% or less means that the difference in humidity at which the hydrophilic adhesive and the heat-generating compositions 3, 4, and 5 reach moisture equilibrium is 2% or less.

[0073] In addition, as adhesives that have good moisture permeability and are less irritating to the skin, water-containing adhesives (hydrophilic adhesives, gels), adhesives that can be hot-melt coated, and rubber-based adhesives are also useful.

[0074] The thermal sheet 10 of this embodiment can be obtained in various shapes, thicknesses, and temperature ranges, and can be used for various purposes, such as for normal body warming, joints, facial care, eyes, hot compresses, medicinal warmers, neck, lower back, gloves, anal fistula, or for easing symptoms such as shoulder pain, muscle pain, and menstrual pain, and for the abdomen, etc. It can also be used to warm and keep pets warm.

[0075] For example, when used to relieve symptoms, the heating sheet 10 of this embodiment is applied directly to the required part of the body, or indirectly through clothing, cloth, etc.

[0076] Examples of pain in muscles, bones, etc. include acute muscle pain, acute skeletal pain, acute referred pain, pre-existing muscle pain, pre-existing skeletal pain, chronic referred pain, and joint pain in the knees, elbows, etc.

[0077] When the thermal sheet 10 is applied directly to a necessary part of the body, there is no limit to the duration, but it is preferably 1 to 24 hours, and more preferably 3 to 20 hours. There is no limit to the sustained temperature, but it is preferably 30 to 50°C, and more preferably 35 to 45°C.

[0078] The thermal sheet 10 adheres to the skin at seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g. If the area of ​​the adhesive part 7 is increased, the thermal sheet 10 is less likely to peel off, but it may become less breathable or difficult to move the body, which may cause discomfort. If the area of ​​the adhesive part 7 is reduced, the breathability is improved and the discomfort can be alleviated, but the thermal sheet 10 is more likely to peel off. For this reason, in this embodiment, the shape and layout of the adhesive part 7 are devised to alleviate the discomfort during use and make it difficult to peel off.

[0079] For example, when the thermal sheet 10 is applied to the shoulder, the thermal sheet 10 curves along the surface of the shoulder as shown in Figure 2. Because the three heat generating compositions 3, 4, 5 have a certain thickness, the areas containing the heat generating compositions 3, 4, 5 are less likely to bend than the seal area 6 (the area where the substrate 1 and covering material 2 are overlapped and welded) where the heat generating compositions 3, 4, 5 are not present. In addition, the heat generating compositions 3, 4, 5 become hard when oxidized over time. For this reason, when the thermal sheet 10 is applied to the shoulder as shown in the figure, the seal area 6 is more likely to bend, whereas the areas containing the heat generating compositions 3, 4, 5 are less likely to bend, and both ends of the heat generating compositions 3, 4, 5 in the bending direction are more likely to lift up from the skin.

[0080] For this reason, in this embodiment, adhesive parts 7a, 7c, 7e, and 7g are provided in the areas that tend to lift off the skin, making it difficult for the thermal sheet 10 to peel off from the skin. The seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g extend in the short direction (up-down direction in the figure) of the thermal sheet 10, which is perpendicular to the arrangement direction (left-right direction in the figure) of the heat generating compositions 3, 4, and 5, and are provided in stripes in the longitudinal direction of the thermal sheet 10, spaced apart from each other and approximately parallel to each other.

[0081] The adhesive portion 7a at the left end in the longitudinal direction of the thermal sheet 10 is provided at a position overlapping the heat generating composition 3 along the left edge of the heat generating composition 3 at the left end of the longitudinal direction of the thermal sheet 10. The third adhesive portion 7c from the left is provided at a position overlapping the heat generating composition 3 along the right edge of the heat generating composition 3 at the left end. The adhesive portion 7b between the adhesive portions 7a and 7c is provided at a position overlapping the heat generating composition 3, separated from the adhesive portions 7a and 7c. Both ends (upper and lower ends in FIG. 1) in the short direction of the three adhesive portions 7a, 7b, and 7c of the thermal sheet 10 extend to the outer edge of the heat generating composition 3. In other words, the three adhesive portions 7a, 7b, and 7c have a shape in which the heat generating composition 3 is divided into three by two lines of a predetermined width extending in the short direction.

[0082] The adhesive portion 7g at the right end in the longitudinal direction of the thermal sheet 10 is provided at a position overlapping the heat generating composition 5 along the right edge of the heat generating composition 5 at the right end in the longitudinal direction of the thermal sheet 10. The third adhesive portion 7e from the right is provided at a position overlapping the heat generating composition 5 along the left edge of the heat generating composition 5 at the right end. The adhesive portion 7f between the adhesive portions 7e and 7g is provided at a position overlapping the heat generating composition 5, separated from the adhesive portions 7e and 7g, respectively. Both ends (upper and lower ends in FIG. 1) in the short direction of the three adhesive portions 7e, 7f, and 7g of the thermal sheet 10 extend to the outer edge of the heat generating composition 5. In other words, the three adhesive portions 7e, 7f, and 7g have a shape in which the heat generating composition 5 is divided into three by two lines of a predetermined width extending in the short direction.

[0083] The adhesive portion 7d at the longitudinal center of the thermal sheet 10 is provided at a position overlapping the widthwise center of the heat generating composition 4 at the longitudinal center of the thermal sheet 10. Both short-side ends (upper and lower ends in the figure) of the adhesive portion 7d extend to the outer edge of the heat generating composition 4. The thermal sheet 10 has an outline that is approximately symmetrical about a line (not shown) extending in the short-side direction that passes through the center of the heat generating composition 4. The thermal sheet 10 can be folded at the seal portion 6 between the heat generating composition 3 and the heat generating composition 4, and at the seal portion 6 between the heat generating composition 4 and the heat generating composition 5.

[0084] The width of each adhesive portion 7 along the longitudinal direction of the thermal sheet 10 and the distance between the adhesive portions 7 are set to values ​​that can make the thermal sheet 10 difficult to peel off and can reduce discomfort during use. In this embodiment, the width of the adhesive portion 7a at the left end in the figure is set to 11 mm, the width of the second adhesive portion 7b from the left is set to 10 mm, the width of the third adhesive portion 7c from the left is set to 9 mm, the width of the central adhesive portion 7d is set to 10 mm, the width of the third adhesive portion 7e from the right is set to 9 mm, the width of the second adhesive portion 7f from the right is set to 10 mm, and the width of the adhesive portion 7g at the right end in the figure is set to 11 mm.

[0085] In addition, in this embodiment, the distance between the adhesive portion 7a at the left end in the figure and the second adhesive portion 7b is set to 7.5 mm, the distance between the second adhesive portion 7b from the left and the third adhesive portion 7c is set to 6.5 mm, the distance between the third adhesive portion 7c from the left and the central adhesive portion 7d is set to 10 mm, the distance between the central adhesive portion 7d and the third adhesive portion 7e from the right is set to 10 mm, the distance between the third adhesive portion 7e from the right and the second adhesive portion 7f from the right is set to 6.5 mm, and the distance between the second adhesive portion 7f from the right and the adhesive portion 7g at the right end in the figure is set to 7.5 mm.

[0086] The thermal sheet 10 of this embodiment can be produced, for example, by the following method. First, a substrate 1 having an adhesive portion 7 of the above-mentioned shape on its outer surface 1a is prepared (FIG. 3; step 1). The striped adhesive portion 7 is formed by applying a predetermined width of adhesive at predetermined intervals on one surface of the substrate 1 while conveying the substrate 1 in a predetermined direction at a constant speed.

[0087] Next, the substrate 1 with the adhesive portion 7 provided on the outer surface 1a is placed on its inner surface with a molding die (not shown) having three through holes in the shapes of the three heat generating compositions 3, 4, and 5, placed on the inner surface of the substrate 1. At this time, the molding die is aligned with the substrate 1 so that the through holes match the shapes of the adhesive portions 7 and the adhesive portions 7 face the edges of the heat generating compositions 3, 4, and 5. The heat generating composition is then poured into the molding die, and any heat generating composition spilling over from the molding die is scraped off (Step 2).

[0088] Furthermore, after removing the molding die, the covering material 2 is placed over the heat generating compositions 3, 4, and 5 arranged at a predetermined interval on the inner surface of the base material 1, and the periphery of each of the heat generating compositions 3, 4, and 5 is heat sealed to form the sealed portion 6 (step 3). At this time, a part of the adhesive portion 7 overlaps the sealed portion 6. In other words, by forming the sealed portion 6 after providing the adhesive portion 7 as in this embodiment, the shape of the edge of the adhesive portion 7 can be made to match the shape of the sealed portion 6.

[0089] Thereafter, the substrate 1 and covering material 2 are cut out at predetermined positions into a predetermined shape to obtain the thermal sheet 10 (step 4). At this time, cuts (not shown here) can also be made between the three heat generating compositions 3, 4, 5 at the same time.

[0090] As described above, according to this embodiment, the striped adhesive portion 7 is provided on the outer surface 1a of the base material 1, which improves the breathability of the thermal sheet 10 and allows the thermal sheet 10 to easily conform to the body, thereby reducing discomfort during use. The direction in which the adhesive portion 7 extends is desirably set to an appropriate direction depending on the part to which the thermal sheet 10 is to be applied. The thermal sheet 10 of this embodiment is intended to be applied to the shoulders or stomach, and the adhesive portion 7 extends in the short direction of the thermal sheet 10 so that the thermal sheet 10 is used while being curved in its longitudinal direction.

[0091] Furthermore, according to this embodiment, the adhesive portion 7 is provided at a position overlapping both ends of the heat generating compositions 3, 4, and 5 along the curved direction of the thermal sheet 10, i.e., the longitudinal direction, so that the portions of the thermal sheet 10 that tend to lift off the skin are less likely to peel off, making the thermal sheet 10 less likely to peel off. For example, looking at the third adhesive portion 7c from the left in Fig. 2, it is provided at a position that tends to lift off the skin, overlapping the edge of the heat generating composition 3 on the side of the heat generating composition 4, improving the adhesive strength of this portion. Other adhesive portions 7 provided overlapping the portions of the thermal sheet 10 that tend to lift off the skin are adhesive portions 7a, 7e, and 7g.

[0092] In this embodiment, the widths of the adhesive parts 7a, 7b, 7c, 7e, 7f, and 7g overlapping the heat generating compositions 3 and 5 at the ends in the curved direction, i.e., the longitudinal direction, of the thermal sheet 10 are gradually increased from the inside to the outside. For example, when focusing on the adhesive parts 7a, 7b, and 7c overlapping the heat generating composition 3 at the left end in Fig. 1, the width of the outermost adhesive part 7a is formed to be 11 mm, the width of the inner adhesive part 7b is formed to be 10 mm, and the width of the innermost adhesive part 7c is formed to be 9 mm.

[0093] In this way, by making the width of the outer adhesive portion 7 wider than the inner adhesive portion 7, the adhesive strength of the outer portion of the thermal sheet 10, which is more likely to peel off, can be made stronger (than the inner portion), making it harder for the thermal sheet 10 to peel off. The adhesive portions 7b and 7f are not provided on the widthwise edges of the heat generating compositions 3 and 5, respectively, but supplement the adhesive strength of the adhesive portions 7a, 7c, 7e and 7g on both sides thereof, and are intended to alleviate discomfort when using the thermal sheet 10 and make it harder for the thermal sheet 10 to peel off.

[0094] In addition, according to this embodiment, the thermal sheet 10 is manufactured by preparing the substrate 1 with the adhesive portion 7 in advance, and the substrate 1 and the covering material 2 are heat-welded at a position that partially overlaps the adhesive portion 7. This allows both ends of the short side of each adhesive portion 7 to be provided right up to the outer edge of the heat generating compositions 3, 4, and 5, and allows the part of the thermal sheet 10 where a step is likely to occur to be more effectively attached to the skin. Since the heat generating compositions 3, 4, and 5 have a predetermined thickness, a step occurs near the outer edge of the heat generating compositions 3, 4, and 5. For this reason, it is effective to provide the adhesive portion 7 at the very edge of the heat generating compositions 3, 4, and 5, as in this embodiment.

[0095] 4 is a graph showing the results of a questionnaire about the feel of using the thermal sheet 10 of this embodiment. For comparison, a comparative product P was created in which two of the seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g were omitted, namely, the adhesive parts 7c and 7e. Forty subjects rated the feel of using this comparative product P on a five-point scale along with the thermal sheet 10 of this embodiment (invention product Q).

[0096] As a result of the questionnaire, the percentage of subjects who answered that the comparison product P was "better" than the invented product Q was 7.5%, the percentage of subjects who answered that the comparison product P was "slightly better" than the invented product Q was 12.5%, the percentage of subjects who answered "cannot say either way" was 32.5%, the percentage of subjects who answered that the invented product Q was "slightly better" than the comparison product P was 27.5%, and the percentage of subjects who answered that the invented product Q was "better" than the comparison product P was 20%.

[0097] In other words, the percentage of subjects who felt that the invented product Q was "better" than the comparative product P was 47.5% of the total.

[0098] 5 is a graph showing the results of a questionnaire regarding the adhesive strength of the thermal sheet 10 of this embodiment. For comparison, a comparative product P was created in which two of the seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g, 7c and 7e, were omitted, and 40 subjects evaluated the adhesive strength of the comparative product P on a 5-point scale along with the thermal sheet 10 of this embodiment (invention product Q).

[0099] As a result of the questionnaire, 5.5% of subjects answered that the adhesive strength of comparison product P was "better" than invented product Q, 12.5% ​​answered that the adhesive strength of comparison product P was "slightly better" than invented product Q, 37.5% answered "cannot say either way," 22.5% answered that the adhesive strength of invented product Q was "slightly better" than comparison product P, and 22.5% answered that the adhesive strength of invented product Q was "better" than comparison product P.

[0100] In other words, the percentage of subjects who felt that the adhesive strength of the inventive product Q was "better" than that of the comparative product P was 45% of the total.

[0101] 6 is a graph showing the results of a questionnaire regarding the peeling resistance of the thermal sheet 10 of this embodiment. For comparison, a comparative product P was created by omitting two of the seven adhesive parts 7a, 7b, 7c, 7d, 7e, 7f, and 7g, omitting the adhesive parts 7c and 7e, and 40 subjects rated the peeling resistance of this comparative product P on a 5-point scale along with the thermal sheet 10 of this embodiment (invention product Q).

[0102] As a result of the questionnaire, the percentage of subjects who answered that the comparison product P was "better" than the invented product Q in terms of resistance to peeling was 5%, the percentage of subjects who answered that the comparison product P was "slightly better" than the invented product Q in terms of resistance to peeling was 17.5%, the percentage of subjects who answered "cannot say either way" was 30%, the percentage of subjects who answered that the invented product Q was "slightly better" than the comparison product P in terms of resistance to peeling was 22.5%, and the percentage of subjects who answered that the invented product Q was "better" than the comparison product P in terms of resistance to peeling was 25%.

[0103] In other words, the percentage of subjects who felt that inventive product Q was "better" than comparative product P in terms of resistance to peeling was 47.5% of the total.

[0104] FIG. 7 is a plan view showing a thermal sheet 20 according to a second embodiment. The thermal sheet 20 comprises a substrate 21, a covering material 22, and four heat generating compositions 23, 24, 25, 26, and is provided with adhesive parts 31, 32 at positions that do not overlap these four heat generating compositions 23, 24, 25, 26. The rest of the configuration is the same as that of the thermal sheet 10 of the first embodiment described above.

[0105] The thermal sheet 20 has four heat generating compositions 23, 24, 25, 26 arranged at a distance from each other in its longitudinal direction (the left-right direction in the figure), and eight adhesive portions 27a, 27b, 27c, 27d, 27e, 27f, 31, 32.

[0106] Adhesive portion 27a (first adhesive portion) is provided at a position overlapping heat generating composition 23 along the left edge of heat generating composition 23 (first heat generating composition) at the left end in the figure, and adhesive portion 27b (second adhesive portion) is provided at a position overlapping heat generating composition 23 along the right edge of heat generating composition 23. Adhesive portion 27f (third adhesive portion) is provided at a position overlapping heat generating composition 26 along the right edge of heat generating composition 26 (second heat generating composition) at the right end in the figure, and adhesive portion 27e (fourth adhesive portion) is provided at a position overlapping heat generating composition 26 along the left edge of heat generating composition 26.

[0107] These four adhesive parts 27a, 27b, 27e, and 27f are provided at locations where the thermal sheet 20 is likely to lift off the skin, making it difficult to peel off the thermal sheet 20. The adhesive parts 27c and 27d, which overlap the two central heat generating compositions 24 and 25 (third heat generating composition), respectively, function as a fifth adhesive part.

[0108] As described above, the thermal sheet 20 of the second embodiment can also achieve the same effects as the thermal sheet 10 of the first embodiment.

[0109] The thermal sheet 20 of this embodiment is intended to be applied to a relatively large area of ​​the body, such as the back or waist, and is slightly larger than the thermal sheet 10. For this reason, adhesive portions 31 and 32 are provided near both ends in the longitudinal direction at areas that do not overlap the heat generating composition. 2 It is prepared.

[0110] This thermal sheet 20 may have a cut line L in the center of its length, or may be divisible into two at the cut line L. In this case, for example, when focusing on the 1 / 2 portion on the left side of the figure, the part cut off by the cut line L is the right end of this portion, which is a part that is relatively easy to peel off. However, since the adhesive portion 27c is provided near the cut line L, this part does not become easy to peel off.

[0111] The present invention is not limited to the above-described embodiment, and various modifications can be made in the implementation stage without departing from the gist of the invention. The above-described embodiment includes various inventions, and various inventions can be extracted by combinations selected from the multiple components disclosed. For example, if the problem can be solved and an effect can be obtained even if some components are deleted from all the components shown in the above-described embodiment, the configuration from which the components are deleted can be extracted as an invention. The invention as described in the claims of the original application is set forth below. [1] A first sheet material; A plurality of heat generating compositions arranged side by side and spaced apart from each other in a first direction along the first sheet material; a second sheet material disposed on an opposite side of the plurality of heat generating compositions from the first sheet material; a seal portion formed by thermally welding the first sheet material and the second sheet material at a continuous portion so as to surround each of the plurality of heat generating compositions; a first adhesive portion provided on an outer surface of the first sheet material along an edge of a first heat generating composition provided at one end in the first direction among the plurality of heat generating compositions, the first adhesive portion being superimposed on the first heat generating composition; a second adhesive portion provided on the outer surface of the first sheet material along an edge of the other end side of the first heat generating composition opposite to the one end of the first heat generating composition, the second adhesive portion being overlapped with the first heat generating composition; A heating sheet having the above structure. [2] The width of the first adhesive portion in the first direction is larger than the width of the second adhesive portion in the first direction. [1] Heating sheet. [3] a third adhesive portion provided on the outer surface of the first sheet material along an edge of a second heat generating composition provided at the other end in the first direction among the plurality of heat generating compositions, the second heat generating composition being overlapped with the second heat generating composition; a fourth adhesive portion provided on the outer surface of the first sheet material along an edge of the one end side of the second heat generating composition, separately from the third adhesive portion, and overlapping the second heat generating composition; The thermal sheet of [1] or [2] further comprises: [4] The width of the third adhesive portion in the first direction is larger than the width of the fourth adhesive portion in the first direction. [3] Heating sheet. [5] A first sheet material; Three heat generating compositions arranged side by side and spaced apart from each other in a first direction along the first sheet material; a second sheet material disposed on the opposite side of the three heat generating compositions from the first sheet material; a seal portion formed by heat-welding the first sheet material and the second sheet material at a continuous portion so as to surround each of the three heat generating compositions; a first adhesive portion provided on an outer surface of the first sheet material along an edge of a first heat generating composition provided at one end in the first direction among the three heat generating compositions, the first adhesive portion being superimposed on the first heat generating composition; a second adhesive portion provided on the outer surface of the first sheet material along an edge of the other end side of the first heat generating composition opposite to the one end of the first heat generating composition, the second adhesive portion being overlapped with the first heat generating composition; a third adhesive portion provided on the outer surface of the first sheet material along an edge of the other end of a second heat generating composition provided at the other end in the first direction among the three heat generating compositions, the third adhesive portion being overlapped with the second heat generating composition; a fourth adhesive portion provided on the outer surface of the first sheet material along an edge of the one end side of the second heat generating composition, separately from the third adhesive portion, and overlapping the second heat generating composition; a fifth adhesive portion provided on the outer surface of the first sheet material so as to overlap a third heat-generating composition between the first heat-generating composition and the second heat-generating composition; A heating sheet having the above structure. [6] a width of the first adhesive portion in the first direction is greater than a width of the second adhesive portion in the first direction; The width of the third adhesive portion in the first direction is larger than the width of the fourth adhesive portion in the first direction. [5] Heating sheet. [7] A method for producing a thermal sheet in which a plurality of exothermic compositions are arranged in a first direction between a first sheet material and a second sheet material and spaced apart from each other, comprising the steps of: preparing the first sheet material having, on its outer surface, a first adhesive portion overlapping the first heat generating composition along an edge of the one end side of a first heat generating composition provided at one end in the first direction among the plurality of heat generating compositions, a second adhesive portion overlapping the first heat generating composition along an edge of the other end side opposite to the one end of the first heat generating composition, a third adhesive portion overlapping the second heat generating composition along an edge of the other end side of a second heat generating composition provided at the other end in the first direction among the plurality of heat generating compositions, and a fourth adhesive portion overlapping the second heat generating composition along an edge of the one end side of the second heat generating composition; The plurality of heat generating compositions are arranged on an inner surface of the first sheet material in accordance with the first to fourth adhesive portions; placing the second sheet material on the side of the plurality of heat generating compositions opposite the first sheet material; The first sheet material and the second sheet material are thermally welded together at continuous portions so as to surround each of the plurality of heat generating compositions. A manufacturing method for a heating sheet. [Explanation of symbols]

[0112] 1…Base material, 1a…Outer surface, 2…Coating material, 3, 4, 5…Heat generating composition, 6…Sealing part, 7, 7a, 7b, 7c, 7d, 7e, 7f, 7g…Adhesive part, 10, 20…Thermal sheet.

Claims

[Claim 1] A first sheet material; Three heat generating compositions arranged in parallel and spaced apart from each other in a first direction along the first sheet material; a second sheet material disposed on the opposite side of the three heat generating compositions from the first sheet material; a seal portion formed by heat-welding the first sheet material and the second sheet material at a continuous portion so as to surround each of the three heat generating compositions; a first adhesive portion provided on an outer surface of the first sheet material along an edge of the one end side of a first heat generating composition provided at one end in the first direction among the three heat generating compositions, the first adhesive portion being overlapped with the first heat generating composition; a second adhesive portion provided on the outer surface of the first sheet material along an edge of the other end side of the first heat generating composition opposite to the one end of the first heat generating composition, the second adhesive portion being overlapped with the first heat generating composition; a third adhesive portion provided on the outer surface of the first sheet material along an edge of the other end of a second heat generating composition provided at the other end in the first direction among the three heat generating compositions, the third adhesive portion being superimposed on the second heat generating composition; a fourth adhesive portion provided on the outer surface of the first sheet material along an edge of the one end side of the second heat generating composition, separately from the third adhesive portion, so as to overlap the second heat generating composition; a fifth adhesive portion provided on the outer surface of the first sheet material so as to overlap a third heat-generating composition between the first heat-generating composition and the second heat-generating composition; the first and second exothermic compositions are larger in size than the third exothermic composition; a width of the first adhesive portion in the first direction is greater than a width of the second adhesive portion in the first direction; A width of the third adhesive portion in the first direction is larger than a width of the fourth adhesive portion in the first direction. Heating sheet.

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