WO2011027436A1 - Heat-generating material and method for producing heat-generating material - Google Patents

Abstract

A heat-generating material, which can follow the extensions and twists of the body in multiple directions and exhibits a good fitting, and a  method for producing the heat-generating material. A heat-generating material provided with a fixing part which is positioned lateral to a heat-generating part, characterized in that a linear cut inclined with respect to the anteroposterior direction of the fixing part is formed between the heat-generating part and the fixing part.

Description

Heating element and method for manufacturing the heating element

The present invention relates to a heating element having a heating part composed of a heating composition such as iron oxide, and to a heating element used directly on a human body or attached to clothes, and a method of manufacturing the heating element.

2. Description of the Related Art Conventionally, in order to make a heating element configured by arranging a plurality of heating parts adjacent to each other, so that the heating element can be attached to a body or the like, an adhesive layer is provided on a part of the heating element to increase its elasticity. Patent Documents 1 and 2 disclose that a plurality of cuts are provided in a direction intersecting with the longitudinal direction of the above.
The inventions disclosed in these documents indicate that the heating element can be elongated in the longitudinal direction by providing the cuts. However, in the proposed invention, the body twists in a plurality of directions of the heating element, etc. There is a problem in that it is not possible to follow the movement of the body and falls off, or the skin is pulled by the adhesive part of the heating element, which gives a sense of incongruity. Further, when a through hole having a shape such as a circle or an ellipse is provided, there is a problem that chips are generated when the cut is provided. Further, when providing a through-hole such as an X-shape or a quadrangular shape, there is a problem that the inner peripheral surface or the like comes into contact with the skin and gives unpleasant feeling.
On the other hand, if the adhesive force is increased to prevent the dropout, the above-mentioned uncomfortable feeling and uncomfortable feeling are increased. In addition, even if an attempt is made to prevent the exothermic part of the heating element from being adhered to prevent it from falling off, the slit provided on the adhesive surface does not extend sufficiently, resulting in a poor fit for body movement. In addition, it is conceivable to increase the length of the plurality of cuts provided in the direction intersecting the longitudinal direction of the heating element so that it can follow the plurality of directions, but the product strength is reduced by the cut. There was a problem.

JP 2008089743 A (Claim 1) International Publication 2006/006664 (Claim 5, paragraphs 0061 to 63, FIGS. 1 to 5, FIG. 27)

Therefore, an object of the present invention is to provide a heating element that can follow the stretching and twisting of the body in a plurality of directions and has excellent fit to the movement of the body, and a method for manufacturing the heating element.

In order to solve the above problems, the present inventors have found a solving means as follows.
A first form of the heating element according to the present invention is a heating element provided with an adhesive part on a side of the heating part, and the front-rear direction of the adhesive part is used as a reference between the heating part and the adhesive part. It is characterized by providing a linear notch that is inclined.
According to a second aspect of the present invention, in the first aspect, the linear cut is an arc shape.
According to a third aspect of the present invention, in the first aspect, at least one end of the linear cut is bent.
According to a fourth aspect of the present invention, in the first aspect, the inclination angle of the cut is 58 ° to 75 ° or 105 ° to 105 ° counterclockwise with a line perpendicular to the reference direction being 0 °. The range is 122 °.
According to a fifth aspect of the present invention, in the first aspect, three or more cuts are provided in the front-rear direction of the adhesive portion.
According to a sixth aspect of the present invention, in the first aspect, the heat generating portion is configured by housing the heat generating composition in a packaging material having air permeability, and is configured by adjoining a plurality of unit heat generating portions. It is characterized by.
According to a seventh aspect of the present invention, in the first aspect, the adhesive portion is provided on both sides of the heat generating portion, and the notch is provided on both side portions of the heat generating body.
According to an eighth aspect of the present invention, in the seventh aspect, the inclining angle of the cuts on the both side portions is the same.
The ninth aspect of the present invention is characterized in that, in the seventh aspect, the inclination angles of the cuts on the both side portions are symmetrical.
According to a tenth aspect of the present invention, in the seventh aspect, two rows of cuts are provided between the heat generating portion and the adhesive portion.
An eleventh aspect of the present invention is characterized in that, in the tenth aspect, the two rows of cut lines are formed by C-shaped cuts.
A twelfth aspect of the present invention is characterized in that, in the first aspect, a curved concave portion is formed on an outer peripheral edge of the heating element in the extending direction of the cut.
A thirteenth aspect of the present invention is a method for manufacturing a heating element according to the first aspect, wherein the packaging material includes a base material on which the heat generating composition is disposed, and a covering material that covers the heat generating composition. And the notch is provided only in the base material, or both the base material and the covering material are provided so as to penetrate therethrough.
A fourteenth aspect of the present invention is a heating element provided with a fixing part on a side of a heating part, and is inclined between the heating part and the fixing part with reference to the front-rear direction of the fixing part. It is characterized by providing a linear cut.

According to the present invention, even if the heating element is affixed to each part of the body or the like, it can follow movements such as stretching and twisting in a plurality of directions, so that it can be prevented from falling off. In addition, since stretching in a plurality of directions is possible, there is no sense of incongruity such as pulling in a specific direction at the time of sticking, and an excellent fit for body movement is obtained. Moreover, since the inner peripheral surface of the site | part formed when a notch spreads becomes curvilinear, even if it contacts skin, there is little discomfort.

The top view of the heat generating body of one embodiment of this invention Explanatory drawing of relative position of exothermic part and adhesive part of the present invention Explanatory drawing of the inclination angle of the present invention The top view of the heat generating body of other embodiment of this invention (A) AA sectional view of the heating element of FIG. 1 (b) Bottom view of the heating element Explanatory drawing of the modification (The heat generating body which has the same inclination angle as a notch of both sides) of the heat generating body of FIG. Explanatory drawing of the other modified example (heating element which has 2 rows of notches) of the heating element of FIG. Explanatory drawing of the other modification (heating element which has a C-shaped cut) of the heating element of FIG. Explanatory drawing of the other modification (heat generating body which has a recessed part) of the heat generating body of FIG. Illustration of linear cut Explanatory drawing of the shape of the sample for evaluating the breaking strength in the notch and the breaking direction in the misalignment direction Explanatory drawing of the shape of the sample for evaluating the lateral elongation of the cut and the breaking strength in the lateral direction Explanatory drawing of the shape of the sample for evaluating the lifting of the packaging material when misalignment occurs Illustration of sample for evaluation 1 Illustration of sample for evaluation 2 Explanatory drawing of sample of evaluation 3 Explanatory drawing of sample of evaluation 4 Explanatory drawing of sample of evaluation 5 Explanatory drawing of sample of evaluation 6 Explanatory drawing of sample of evaluation 7 Explanatory drawing of sample of evaluation 8 Explanatory drawing of sample of evaluation 8

As shown in FIG. 1, the heating element according to the embodiment of the present invention is provided with adhesive portions 2 and 2 on the side of the heating portion 1 and provided with inclined linear cuts 4 and 4. Thereby, the heating part 1 of the heating element attached to a predetermined part of the body or clothes can move away from the part in the front-rear direction of the adhesive part with respect to the adhesive parts 2 and 2.
In the illustrated example, the adhesive portions 2 and 2 are located on the side opposite to the heating element 1 with respect to the heat generating portion 1, but the adhesive portion 2 and the heat generating portion 1 exist on the same surface. It may be.

As shown in FIG. 2A, the front-rear direction of the adhesive portion 2 is such that the centroid (center of gravity) of the heat generating portion 1 is positioned on the horizontal line 5 in the lateral direction with respect to the centroid (center of gravity) of the adhesive portion 2. In this case, the direction of the vertical line (reference line 3) with respect to the horizontal line 5 is assumed. As shown in FIG. 2 (b), even if the centroid (center of gravity) of the heat generating portion 1 is not positioned on the horizontal line 5 in the lateral direction with respect to the centroid (center of gravity) of the adhesive portion 2, A direction perpendicular to the horizontal line 5 is referred to as a front-rear direction. The direction orthogonal to the front-rear direction is referred to as the horizontal direction.

In the present invention, an inclined linear notch 4 is provided with reference to the vertical line (reference line 3). Therefore, the horizontal line perpendicular to the vertical line (reference line 3) is not included in the inclination. Further, the “linear cut” means a through-hole having a line width of 1 mm or less connecting two points. If the line width exceeds 1 mm, punching is required, and chips and the like are generated. Therefore, the width is preferably 1 mm or less.
In addition, it is preferable to use a curved notch to increase the distance that the heat generating part 1 is separated from the adhesive part 2 so that the heat generating part 1 can be displaced over a wide range, and to eliminate the uncomfortable feeling of hitting the skin during use. For the convenience of manufacturing, it is preferable that the arc-shaped cut has a predetermined curvature.

As shown in FIG. 3, the inclination angle of the notch 4 is 58 ° to 75 ° or 105 ° to 122 ° counterclockwise with the horizontal line P perpendicular to the vertical line C (reference line 3) being 0 °. It is preferable to set it as the range. If it is less than 58 ° and more than 122 °, the amount of movement of the heat generating part 1 in the front-rear direction with respect to the adhesive part 2 becomes insufficient and cannot follow the movement of the body. A notch 4 is provided substantially parallel to the vertical line C, and when a shear stress is applied between the adhesive part 2 and the heat generating part 1 on both sides of the notch 4, there is a problem that the heating element is cut. is there.

Moreover, it is preferable to provide a plurality of cuts 4 as shown in FIGS. 1, 4 and 5B. In this case, as shown in FIG. 4, for one of the notch 4 _1, the distance to the other cuts 4 ₂ adjacent in the longitudinal direction, the adhesive portion 2 side than the heat generating portion 1 side of the adjacent distance D ₂ it is preferred that the adjacent distance D ₁ is provided with a portion to be narrowed.
Moreover, as shown in FIG. 1, it is preferable to provide three or more incisions 4 in the front-rear direction. This is because if the number is two or less, it is necessary to increase the length of the notch 4 in order to ensure the amount of movement of the heat generating portion 1, and if the length of the notch 4 is excessively long, the notch 4 may be cut. This interval is preferably 4 mm to 24 mm. This is because if it is less than 4 mm, it is easy to cut, and if it exceeds 24 mm, a sufficient amount of movement cannot be secured.

Since the heating element is affixed to the body or clothes, the heating part 1 can be configured using a known element that generates heat as long as it does not cause burns or the like.
As an example, when the heat generating portion 1 is constituted by a heat generating composition using iron powder, the heat generating composition 6 is formed into a predetermined shape as shown in FIG. In this state, the non-breathable base material 7 is adjacent to the base material 7 at a predetermined interval and covered with a covering material 8 having air permeability from above, and the base material 7 and the covering material 8 on the outer periphery of the exothermic composition 6 are coated. By heat sealing or the like, the heat generating part 1 can be made of a set of unit heat generating parts 1a divided by the seal part.
In the illustrated example, the adhesive portions 2 and 2 are provided on both sides of the back surface of the base material 7, and the adhesive portions on both sides are also provided near the central portion of the heating element as shown in FIG. Adhesive portions 2 ′ and 2 ′ are provided substantially in parallel with 2 and 2.

The exothermic composition is a molding exothermic composition and contains iron powder, a carbon component, a reaction accelerator and water as essential components.
In order to impart moldability to the exothermic composition, excess water that is not used in the exothermic reaction can be contained, or a thickener can be contained.

Further, if desired, the exothermic composition may be a water retention agent, a water-absorbing polymer, a pH adjuster, a hydrogen generation inhibitor, an aggregate, a fibrous material, a surfactant, a hydrophobic polymer compound, a heat generation aid, or a material other than iron. You may add at least 1 sort (s) chosen from the additional component which consists of metal, metal oxides other than iron oxide, an acidic substance, or these mixtures.

In addition, the mixing ratio of the exothermic composition is not particularly limited, but the reaction accelerator is 1.0 to 50 parts by mass with respect to 100 parts by mass of the iron powder, and the water is 1.0 to 60 parts. By weight, carbon component 1.0-50 parts, water retention agent 0.01-10 parts, water-absorbing polymer 0.01-20 parts, pH adjuster 0.01-5 parts, hydrogen generation inhibitor The amount can be 0.01 to 12 parts by mass.
Furthermore, you may add the following to the said exothermic composition with the following mixture ratio with respect to 100 mass parts of iron powder. That is, 1.0-50 parts by weight of metals other than iron, 1.0-50 parts by weight of metal oxides other than iron oxide, 0.01-5 parts by weight of surfactant, hydrophobic polymer compound, aggregate, fiber Each of the substances is 0.01 to 10 parts by mass, 0.01 to 10 parts by mass of a heat generation aid, and 0.01 to 1 part by mass of an acidic substance.

The water may be from a suitable source. There are no restrictions on the purity and type.
In the case of the exothermic composition, the content of water is 7 to 60% by mass, preferably 10 to 50% by mass, and more preferably 20 to 50% by mass of the exothermic composition.

The carbon component is not limited as long as it contains carbon as a component. Examples thereof include carbon black, graphite, activated carbon and the like. Examples include activated carbon prepared from coconut shells, wood, charcoal, coal, bone charcoal, etc., and those prepared from other raw materials such as animal products, natural gas, fats, oils and resins. In particular, activated carbon having adsorption retention ability is preferable.
Moreover, as a carbon component, it is not always necessary to exist alone, and when iron powder containing and / or coated with a carbon component is used in a heat generating composition, the carbon component may not be present alone. The exothermic composition includes a carbon component.

The reaction accelerator is not limited as long as it can accelerate the reaction of the exothermic substance. Examples include metal halides, nitrates, acetates, carbonates, metal sulfates, and the like. Metal halides include sodium chloride, potassium chloride, magnesium chloride, calcium chloride, ferrous chloride, ferric chloride, sodium bromide, potassium bromide, ferrous bromide, ferric bromide, iodide Examples thereof include sodium and potassium iodide. Examples of nitrates include sodium nitrate and potassium nitrate. An example of the acetate is sodium acetate. Examples of the carbonate include ferrous carbonate and the like. Examples of the metal sulfates include potassium sulfate, sodium sulfate, ferrous sulfate and the like.

The water retaining agent is not limited as long as it can retain water. Wood powder, pulp powder, activated carbon, sawdust, cotton fabric with many fluff, cotton short fibers, paper waste, plant material and other plant porous materials with large capillary function and hydrophilicity, activated clay, zeolite, etc. Examples thereof include hydrous magnesium silicate clay mineral, perlite, vermiculite, silica-based porous material, fossil fossil, volcanic ash-based material (terra balloon, shirasu balloon, taisetsu balloon, etc.). In addition, in order to increase the water retention capacity of these water retention agents, those subjected to processing such as firing and / or pulverization may be used.
The water-absorbing polymer is not particularly limited as long as it has a crosslinked structure and has a water absorption ratio of 3 times or more with respect to its own weight. Moreover, what cross-linked the surface may be used. Conventionally known water-absorbing polymers and commercially available products can also be used.
Examples of the water-absorbing polymer include a crosslinked poly (meth) acrylic acid, a crosslinked poly (meth) acrylate, a crosslinked poly (meth) acrylate having a sulfonic acid group, and a poly (meth) having a polyoxyalkylene group. Cross-linked acrylic ester, cross-linked poly (meth) acrylamide, cross-linked copolymer of (meth) acrylate and (meth) acrylamide, copolymer of hydroxyalkyl (meth) acrylate and (meth) acrylate Cross-linked product, cross-linked polydioxolane, cross-linked polyethylene oxide, cross-linked polyvinyl pyrrolidone, sulfonated polystyrene cross-linked product, cross-linked polyvinyl pyridine, starch-poly (meth) acrylonitrile graft copolymer saponified product, starch-poly (meth) acrylic acid ( Salt) Graft cross-linked copolymer, anhydrous with polyvinyl alcohol Reaction product of maleic acid (salt), cross-linked polyvinyl alcohol sulfonate, polyvinyl alcohol - acrylic acid graft copolymers, polyisobutylene maleic acid (salt) cross-linked polymer, and the like as an example. These may be used alone or in combination of two or more.
The water-absorbing polymer having biodegradability in the water-absorbing polymer is not limited as long as it is a water-absorbing polymer having biodegradability. Examples include polyethylene oxide crosslinked bodies, polyvinyl alcohol crosslinked bodies, carboxymethyl cellulose crosslinked bodies, alginic acid crosslinked bodies, starch crosslinked bodies, polyamino acid crosslinked bodies, and polylactic acid crosslinked bodies.
The pH adjuster is not limited as long as the pH can be adjusted. There are alkali metal weak acid salts and hydroxides, or alkaline earth metal weak acid salts and hydroxides. Na ₂ CO ₃ , NaHCO ₃ , Na ₃ PO ₄ , Na ₂ HPO ₄ , Na ₅ P ₃ Examples include O ₁₀ , NaOH, KOH, Ca (OH) ₂ , Mg (OH) ₂ , and Ca ₃ (PO ₄ ) ₂ .
The hydrogen generation inhibitor is not limited as long as it suppresses the generation of hydrogen. As an example, there may be mentioned at least one selected from the group consisting of sulfur compounds, oxidizing agents, alkaline substances, sulfur, antimony, selenium, phosphorus and tellurium, or two or more. Examples of sulfur compounds include compounds with alkali metals and alkaline earth metals, metal sulfides such as calcium sulfide, metal sulfites such as sodium sulfite, and metal thiosulfates such as sodium thiosulfate.
Examples of the oxidizing agent include nitrate, oxide, peroxide, halogenated oxyacid salt, permanganate, chromate and the like.
The aggregate is not particularly limited as long as it is useful as a filler and / or useful for making the exothermic composition porous. Fossil coral (coral fossil, weathered reef coral, etc.), bamboo charcoal, Bincho charcoal, silica-alumina powder, silica-magnesia powder, kaolin, crystalline cellulose, colloidal silica, pumice, silica gel, silica powder, mica powder, clay, talc, Examples include synthetic resin powders and pellets, foamed synthetic resins such as foamed polyester and polyurethane, algae, alumina, and fiber powder. Kaolin and crystalline cellulose are not included in the exothermic composition of the present invention.
The fibrous material is an inorganic fibrous material and / or an organic fibrous material, such as rock wool, glass fiber, carbon fiber, metal fiber, pulp, paper, non-woven fabric, woven fabric, cotton or hemp Examples include natural fibers, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, synthetic fibers, and pulverized products thereof.
Examples of the surfactant include surfactants containing an anion, a cation, a nonion and an amphoteric ion. In particular, nonionic surfactants are preferred, and polyoxyethylene alkyl ethers, alkylphenol / ethylene oxide adducts, higher alcohol phosphates, and the like are listed as examples.
The hydrophobic polymer compound is a polymer compound having a contact angle with water of 40 ° or more, more preferably 50 ° or more, and further preferably 60 ° or more in order to improve drainage in the composition. There is no limit. There is no restriction | limiting also in a shape, A powder, a granule, a grain, a tablet, etc. are mentioned as an example. Examples include polyolefins such as polyethylene and polypropylene, polyesters, polyamides, and the like.
Examples of the heat generation aid include metal powders, metal salts, metal oxides, and examples include Cu, Mn, CuCl ₂ , FeCl ₂ , manganese dioxide, cupric oxide, iron tetroxide, and mixtures thereof. As mentioned.
Examples of the metal oxide other than iron oxide include manganese dioxide and cupric oxide.
The acidic substance may be any of an inorganic acid, an organic acid, and an acidic salt. Hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, citric acid, malic acid, maleic acid, chloroacetic acid, iron chloride, iron sulfate, Examples include iron oxide, iron citrate, aluminum chloride, ammonium chloride, hypochlorous acid and the like.

The iron powder includes not only normal 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.
Although the said iron powder is not limited, Cast iron iron powder, atomized iron powder, electrolytic iron powder, reduced iron powder, sponge iron powder, those iron alloy powder, mixed powder, etc. can be used as an example. Furthermore, these iron powders may contain carbon or oxygen, or may contain other metals, such as iron containing 50% or more of iron. The type of metal contained as an alloy or the like is not particularly limited as long as the iron component acts as a component of the exothermic composition, but metals such as aluminum, manganese, copper, nickel, silicon, cobalt, palladium and molybdenum, and semiconductors are listed as examples. It is done. These metals and alloys may be present only on the surface or inside, or on both the surface and inside.

Exothermic compositions are water-soluble polymers, agglomeration aids, agglomeration aids, agglomeration aids, dry binders, dry binders, dry binders, adhesive materials, thickeners, as long as they do not affect the temperature rise characteristics. An agent, an excipient, a flocculant, and a soluble adhesive material can be contained.

In addition, the heating element that is provided in the market and that contains the exothermic composition in a storage bag is provided on the premise that it can be stored in an outer bag that is a non-breathable storage bag and stored for a long time. It is preferable to use the exothermic composition contained.

Further, the unit heat generating portions 1a and 1a shown in FIG. 5A can be arbitrarily selected with respect to the width, height, and length.
The width of the dividing portion, which is the interval between the unit heat generating portions 1a, is not limited as long as it can be divided, but is usually 3 mm or more. However, in the case where a cut is provided in the section, it is preferably 10 mm or more.
The unit heating portion may have any shape, but examples thereof include a planar shape such as a circle, an ellipse, a polygon, a star, and a flower. For solid shapes, polygonal pyramid shape, conical shape, frustum shape, spherical shape, parallelepiped shape, cylindrical shape, semi-cylindrical shape, semi-elliptical cylinder shape, bowl shape, cylindrical shape, elliptical cylinder shape, etc. Is given as an example. In addition, these shapes may be provided with rounded corners, the corners may be curved or curved, or the center may have a recess.

These heat-generating parts are molded to form a heat-generating part or heat-generating body having a unit heat-generating part by laminating a heat-generating composition molded body on a packaging material that does not have a storage pocket, and then covering and sealing the packaging material. In this case, at least one of the packaging materials is preferably a laminate of a fibrous material made of thermoplastic resin and a film-like material made of thermoplastic resin.
The film-like material is formed into at least one film that becomes a constituent layer of a base material or a covering material, and examples of the fibrous material include a nonwoven fabric and a woven fabric. There is no restriction | limiting in the method of the said lamination | stacking, The method used at the time of preparation of the packaging material used with heat generating bodies, such as a chemical warmer, is mentioned as an example.

In the present specification, moldability refers to a molded product of a heat generating composition in the shape of a punched hole or a concave mold by die-through molding using a punched mold having a punched hole or casting molding using a concave mold. This indicates that the molded shape of the exothermic composition molded body is maintained after molding including mold separation.
If there is formability, the exothermic composition molded body is covered with at least the covering material, and the shape is maintained until the seal portion is formed between the base material and the covering material. Since sealing can be performed and so-called sesame, which is a broken piece of the exothermic composition, is not scattered in the sealing portion, sealing can be performed without being cut off.

Moreover, as the said base material 7, rayon etc. can be used, for example. Moreover, as the coating | covering material 8, a nylon spun bond etc. can be used, for example. In addition, the site | part which has air permeability may be the base material 7 side, the coating | covering material 8 side, or both.
The breathability is not limited as long as heat generation can be maintained. When used for normal heating, breathable Risshi method moisture permeability by the (Lyssy method), usually at ^{50 ~ 10,000g / m 2 / 24hr} , preferably 70 ~ 5,000g ^/ m 2 ^/ 24hr by weight, more preferably ^{100 ~ 2,000g / m 2 / 24hr} , more preferably from ^{100 ~ 700g / m 2 / 24hr} .
The moisture permeability, the less heat generation amount is less than 50, it is not preferable because no sufficient heating effect can not be obtained, whereas, the safety becomes higher and the heating temperature exceeds 10,000g ^/ m 2 / 24hr This is not preferable because a problem may occur.
However, you exceed 10,000g ^/ m 2 ^/ 24hr some applications, it is also not limited to use in moisture permeability near the open system in some cases.
Further, the base material 7 can be made of, for example, a material having a stretch rate of 2.5% in the TD direction and about 2% in the MD direction in a sample having a width of 60 mm (compliant JIS standard: L1096 8.14). Further, the elongation ratio of the covering material 8 (compliant JIS standard: L1096 8.14) is a sample having a width of 60 mm, and a material having about 4.1% in the TD direction and about 2% in the MD direction can be used, for example. This is because both the base material 7 and the covering material 8 can be designed by assuming the degree of deformation of the entire heating element from the length, number, and shape of the notches 4 by using a material having low extensibility.

At least one of the base material and the coating material (hereinafter also referred to as “packaging material”) is preferably 400 g / mm ² or more, more preferably 500 g / mm ² or more, still more preferably 1000 g / mm ² or more, More preferably, it is made of a material having a breaking strength of 2000 g / mm ² or more. The thickness of the packaging material is not limited as long as the breaking strength is ensured, but is preferably 10 μm or more, more preferably 10 to 500 μm, still more preferably 10 to 300 μm, still more preferably 10 to 10 μm. It is 250 μm, more preferably 50 to 250 μm.
A preferred example of the packaging material is a laminate of a nonwoven fabric and a thermoplastic resin film.
At least one packaging material is a laminate of a fibrous material and a film-like material, and is a heat-sealable and flexible material. A heating element using the packaging material as at least one of a base material and a covering material is obtained by laminating a heating composition molded body on a substantially planar base material and covering the covering material with the heating composition molding. The peripheral part of the material is heat-sealed, and a section that is a seal part is formed. As an example, when the packaging material is used as a coating material, it is flexible, has a waist, and ensures a heat-generating composition molded body. Can be covered. Furthermore, at the time of heat sealing, the coating material does not break due to the temperature at the time of heat sealing, and there is no breakage of the seal, so that a reliable heat sealing portion can be formed.

The heat seal material constituting the heat seal layer may be a single material or a composite material having a heat seal layer, and is not limited as long as at least a part thereof can be bonded by heating. Examples include polyolefins such as polyethylene and polypropylene, olefin copolymer resins, ethylene hot-melt resins such as ethylene-acrylic acid ester copolymer resins such as ethylene-vinyl acetate copolymer resins, ethylene-isobutyl acrylate copolymer resins, Polyamide hot melt resin, butyral hot melt resin, polyester hot melt resin, polyamide hot melt resin, polyester hot melt resin, polymethyl methacrylate hot melt resin, polyvinyl ether hot melt resin, polyurethane hot melt resin Examples thereof include hot melt resins such as polycarbonate hot melt resins, vinyl acetate, vinyl chloride-vinyl acetate copolymers, and films and sheets thereof. Moreover, what mix | blended various additives, such as antioxidant, can also be used for hot-melt-type resin and its film and sheet | seat. In particular, low density polyethylene and polyethylene using a metallocene catalyst are useful.

Examples of the non-woven fabric include pulp, hemp, cotton, rayon, acetate and other plant fibers, synthetic pulp made from polyethylene and the like, copolymers mainly composed of polyethylene, polypropylene, propylene and ethylene, propylene-ethylene- Single fibers and composite fibers of thermoplastic polymer materials such as polyolefins aimed at self-bonding types such as butene ternary random copolymers, polyamides such as nylon 6, polyesters such as polyethylene terephthalate, and mixtures thereof What mixed the fiber and also the cellulose fiber pulp etc. is used. The nonwoven fabric may be a short fiber nonwoven fabric, a long fiber nonwoven fabric, or a continuous filament nonwoven fabric, but a long fiber nonwoven fabric or a continuous filament nonwoven fabric is preferred from the viewpoint of mechanical properties.

In addition, the film on the side of the human skin, such as the base material, that constitutes the heating element, may be provided with water absorption for absorbing secretions such as sweat, or may contain moisture or the like in advance. The skin may be replenished with moisture.
Specifically, paper, woven fabric, nonwoven fabric having water absorption in the intermediate layer of the film, or a laminate of foam sheets, or paper, woven fabric, nonwoven fabric carrying a water retention agent such as a water absorbent polymer or bentonite. Or what laminated | stacked the foam sheet etc. is mentioned as an example.

The base material and the covering material may be any material such as transparent, opaque, colored, or uncolored. Further, a symbol, a picture, a photograph, a figure, a pattern, or the like may be provided.
You may provide a thermal relaxation sheet | seat in the side which contacts the skin of the said heat generating part.

The heating element is enclosed in an airtight non-breathable storage bag (outer bag), stored and transported. For example, the produced heating element is placed between two non-breathable films or sheets. The two films or sheets are punched out to a size larger than the heating element at the same time or after this intervention, and the periphery exceeding the size of the heating element at the same time as or before punching. In the part, a heating element in which the two films or sheets are sealed is mentioned as an example. The outer bag is not limited as long as it is non-breathable, and may be laminated, and is usually made of a non-breathable material. The heating element can be folded or wrapped around the heat generating part or the like, and enclosed in the outer bag, so that it becomes very compact, resulting in saving of the outer bag, excellent portability, and the like.

In the present invention, the material constituting the pressure-sensitive adhesive portion 2 is not particularly limited as long as it can attach a heating element to the body or clothes, but for example, a SIS pressure-sensitive adhesive (weight per unit: 70 g / m ^2). ) Etc. can be used. Also, the adhesive strength is not particularly limited, but can be in the range of 0.18 to 2.5 kgf / 25 mm, for example.

The heating element described in FIGS. 1 and 5 is provided with adhesive portions 2 on both sides of a heat generating portion 1 composed of a plurality of unit heat generating portions 1a, and a notch 4 is provided between the heat generating portion 1 and the adhesive portion 2. The heat generating part 1 is supported by the adhesive parts 2 on both sides and is stable by being configured in this way, and is moved in the front-rear direction of the heat generating part 1 by the cuts 4 on both sides. Can be made.

Further, in the example shown in FIG. 1, on both sides of the heating element, the angle of the notch 3 is set to a symmetrical inclination angle so that the heating part 1 can move on the center line of the adhesive parts 2 and 2 on both sides. However, as shown in FIG. 6, if the left and right cuts 4 and 4 have the same inclination angle, the other adhesive portion 2 can be moved in parallel with respect to one adhesive portion 2. That is, it can move to the upper side and the lower side in the figure.

1 and FIG. 6 have described one row of cuts 4 provided, but as shown in FIG. 7, cuts 4a and 4b having the same inclination angle may be provided in two rows, or FIG. As shown, the two rows of cuts 4c and 4d may be opposed to each other in a C shape. As shown in FIG. 8, when the C-shaped cuts 4c and 4d are provided, the shortest distance between the cuts 4c and 4d is preferably about 1 mm to 10 mm.

The inclined linear incision is provided so as to penetrate in the thickness direction so as not to cause a sense of incongruity even when directly applied to the skin, and has a certain strength even if the heating element is substantially non-stretchable and non-extensible. However, it is provided at an angle that causes a shift.

The shape of the cut is not limited as long as the corners and protrusions do not pierce the skin when used directly on the skin. For example, the cut is formed by cutting as shown in FIGS. 10 (a) to 10 (d). Although not shown, it may be punched with a width of about several mm, but when performing punching processing such as a circle or an ellipse that causes chipping from the base material, There is a problem that the line speed cannot be increased because the punched portion needs to be collected as garbage. Therefore, it is desirable to use a single straight line or curved cut as shown in FIGS. 10 (a) to 10 (d) and FIG.
Further, as shown in FIG. 10 (e), in the case where a cut parallel to the front-rear direction of the adhesive portion is provided, it is easy to break between the adhesive portion and the heat generating portion, as shown in FIG. 10 (f). In addition, in the case of providing a cut in a direction perpendicular to the front-rear direction of the adhesive portion, since there is no deviation between the adhesive portion and the heat generating portion, it is excluded from the present invention.

When the notch is stretched in the front and rear end direction of the adhesive part, the shape of the notch is deformed, causing the heat generating part to be displaced with respect to the fixing part such as the adhesive, and the stress generated between the body and the heating element is extremely high. It can be made small, and the number of times the stress is transmitted to the body can be reduced, and the uncomfortable feeling that the skin is pulled can be suppressed. In particular, a portion having a plurality of cuts penetrating in an inclined linear thickness direction has a substantially parallelogram shape having a height in the thickness (fault) direction, and the deformation of the adhesive portion in the front-rear direction is deformed. Is possible.

The length of the notch is preferably 6 to 16 mm, and more preferably 12 to 16 mm. The width is preferably greater than 0 and within 1 mm.
The interval (pitch) between one notch in the same row and the notches adjacent to it is preferably 4 to 24 mm, more preferably 8 to 14 mm, and still more preferably 8 to 9 mm.

There is no restriction on the shape after the gap between the heat generating part and the fixing part (adhesive) due to the inclined linear notch, and the notch after the deviation occurs in the inclined linear notch. When the dimensions are slanted linear, the flat adhesive part of the heating element is hardly stretched in the front-rear direction and in the horizontal direction, and the thickness (fault) direction, especially the heat-generating part side of the notch is skin. It floats up to a certain height in the direction away from it. Stretching of the adhesive portion in the front-rear direction is caused by a gentle bending of a notch and a portion located between the notches adjacent thereto.

Even if the non-extensible material or the material that is substantially non-extensible, that is, the base material and / or the covering material has stretchability and extensibility, if extensibility is not seen after bonding by heat sealing etc., The incision penetrating in the thickness direction arranged in the inclined line shape and the portion located between the adjacent incisions are gently bent, thereby causing a deviation between the heat generating portion and the fixing portion (adhesive). The displacement due to the cut depends on the ease of lifting in the thickness (fault) direction, but the cut portion (the cut portion refers to a portion of a packaging material such as a base material or a covering material in the vicinity of the cut) due to the displacement or extension. The same can be selected as long as it has a strength that does not break. In particular, if a pattern with a substantially parallelogram having a higher height is used, a shift is likely to occur.

As an example of the arrangement means for the cut, there is no particular limitation, but a rotary die cutter, a magnet cylinder to which a flexible die is adsorbed, a flat plate die attached with a BIK blade or a Thomson blade can be used. In the case of using a rotary die cutter and a magnet cylinder, it is possible to continuously dispose, and to dispose incisions from the base material side, the coating material side, and the adhesive surface side.

It is preferable that the heating element of the present invention causes a deviation in the thickness (fault) direction with respect to the heating element plane having a cut, and the deviation caused by a stress of 5 N / 70 mm width is non-extensible. In some cases, it is preferably 2.3 mm or more, and more preferably 4.7 mm or more. If it is less than 2.3 mm, the fit to the movement of the body becomes insufficient.

The breaking strength of the cut portion is not limited as long as it can be used as a heating element. Although depending on the application, the breaking strength is preferably 20 N / 70 mm or more, and more preferably 30 N / 70 mm or more.
If it is less than 20 N / 70 mm, the cut portion may be cut depending on the application when the movement of the body follows and a shift occurs. Here, the breaking strength means the strength of the post-bonding packaging material, the base material, and the like after the linear cut is formed. As a method for measuring a sample having a notch penetrating in the thickness direction arranged in an inclined line, a tensile test JIS L1096 (L1096: 1999, 8.14.1 elongation rate a) A method (constant speed elongation method) ), Using a cut-in sample with an effective width of 70 mm, a deviation occurs, that is, the film is stretched in the front-rear direction of the adhesive portion and measured in the same manner as when measuring the strength of a normal film. it can. At that time, as shown in FIG. 11, a 22.5 mm width located on the diagonal line on both sides (left and right) of the sample corresponding to the fixing part (adhesive) is sandwiched between the upper and lower chucking parts and used for measurement. It was.

Moreover, it is preferable that the said notch forms the recessed part 9 curved in the outer periphery of a heat generating body, as shown in FIG. This is because the amount of movement of the heat generating portion 1 in the front-rear direction can be further increased.
The degree of curvature of the curved recess 9 is not particularly limited, but it is preferable that there are no protrusions, corners, or the like at the junction with the outer peripheral edge of the heating element. This is to prevent discomfort when touching the body.

According to the heating element, the heating part 1 can move away from the surface to which the adhesive part 2 adheres and move in the front-rear direction of the adhesive part 2. Since it does not occur, the fit to the movement of the body is excellent.

Further, when the heating element described with reference to FIG. 6 is manufactured, the notch 4 is provided through both the base material 7 and the covering material 8.

Although the method of using the heating element of the present invention is not limited, it can be used as a method of relieving symptoms such as stiff shoulders, low back pain, muscle fatigue, and releasing the tension of muscles and muscles that inhibit the blood flow.

Further, pressure treatment or the like may be performed on the entire surface or a part of at least one of the exothermic composition molded body, the base material, and the covering material, or irregularities may be formed. These may prevent the exothermic composition molded body from moving between the base material and the coating material.

In the heat generating portion, a magnetic substance can be contained, and a magnetic substance such as a magnet can be accommodated for the purpose of improving blood circulation and stiff shoulders by a magnetic effect.

The fixing means is not limited as long as it has a fixing capability capable of fixing a heating element or a heating part to a required part. However, it is not provided in the notch.
Adhesive layers, key hooks, hook buttons, hook-and-loop fasteners such as Velcro, bands, strings, and combinations thereof, which are generally employed as the fixing means, can be arbitrarily used.
Here, the hook-and-loop fastener is known by a trade name such as Velcro (registered trademark), Velcro fastener (registered trademark), Velcro fastener, hook and loop tape, and the like. It has a fastening function in combination with a hook that is a male fastener that can be fastened. Examples of the material having the loop function include a nonwoven fabric and a woven fabric of yarns having fluff and traps. The surface of the core material forming the fixing means is coated with a material having the loop function (female fastener function). Also good. The hook member, which is a male fastener member, is not particularly limited, and examples thereof include those formed from polyolefin resins such as polyethylene and polypropylene, polyamide, polyester, and the like. The shape of the hook is not particularly limited, but hooks having a cross-sectional shape of I-shaped, inverted L-shaped, inverted J-shaped, so-called mushrooms, etc. are easily caught on the loop, and the skin is extremely irritating Is preferable in that Note that the hook may be adhered to the entire area of the fastening tape, or the tape base may be omitted and only the hook may be used as the fastening tape.
The pressure-sensitive adhesive layer may be a water retention agent, a water absorbing polymer, a pH adjuster, a surfactant, an organosilicon compound, a hydrophobic polymer compound, an antioxidant, an aggregate, a fibrous material, a moisturizing agent, a functional substance, or these It may contain at least one selected from additional components comprising a mixture of
The pressure-sensitive adhesive is classified into a non-hydrophilic pressure-sensitive adhesive, a mixed pressure-sensitive adhesive, and a hydrophilic pressure-sensitive adhesive (gel, etc.).
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited as long as it has an adhesive force necessary for adhering to the skin and clothes, and is solvent-based, aqueous-based, emulsion-type, hot-melt-type, and reactive. Various forms such as a pressure sensitive system, a non-hydrophilic adhesive, and a hydrophilic adhesive are used.
The non-hydrophilic pressure-sensitive adhesive layer containing a water-absorbing polymer or a water retention agent to improve water absorption is treated as a non-hydrophilic pressure-sensitive adhesive layer.
A hot melt adhesive may be provided between the hydrophilic adhesive layer and the substrate or the covering material.
Moreover, there is no restriction | limiting in the case where the said hydrophilic adhesive is provided in a heat generating body, You may provide a hydrophilic adhesive layer in a heat generating body after the heat processing of a heat generating body.
The pressure-sensitive adhesive constituting the non-hydrophilic pressure-sensitive adhesive layer is acrylic pressure-sensitive adhesive, vinyl acetate-based pressure-sensitive adhesive (vinyl acetate resin emulsion, ethylene-vinyl acetate resin-based hot melt pressure-sensitive adhesive), polyvinyl alcohol pressure-sensitive adhesive, polyvinyl acetal type. Adhesive, vinyl chloride adhesive, polyamide adhesive, polyethylene adhesive, cellulose adhesive, chloroprene (neoprene) adhesive, nitrile rubber adhesive, polysulfide adhesive, butyl rubber adhesive, silicone rubber Examples of the pressure-sensitive adhesive include a styrene-based pressure-sensitive adhesive (for example, a styrene-based hot melt pressure-sensitive adhesive), a rubber-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive. Among these, rubber adhesives, acrylic adhesives, or hot melt polymers for reasons such as high adhesive strength, low cost, good long-term stability, and little decrease in adhesive strength even when heated. An adhesive containing the substance is desirable.
If desired, the pressure-sensitive adhesive is alicyclic petroleum resin such as rosin, coumarone indene resin, hydrogenated petroleum resin, maleic anhydride modified rosin, rosin derivative or C5 petroleum resin. Tackifiers such as petroleum resins, terpene phenol resins, rosin phenol resins, alkyl phenol resins and other phenol tackifiers (particularly tackifiers having an aniline point of 50 ° C. or lower), coconut oil, castor oil Softeners such as olive oil, camellia oil, liquid paraffin, softeners, anti-aging agents, fillers, aggregates, tackifiers, tackifiers, colorants, antifoaming agents, thickeners, modifiers, etc. It may be blended appropriately to improve performance such as improved adhesion to nylon clothing or blended fabric clothing.
Examples of the hot melt pressure-sensitive adhesive include known hot-melt pressure-sensitive adhesives that have been provided with tackiness, and specifically include, for example, an ABA block type copolymer such as SIS, SBS, SEBS, or SIPS. Styrenic adhesive with polymer as base polymer, vinyl chloride adhesive with vinyl chloride resin as base polymer, polyester adhesive with polyester as base polymer, polyamide adhesive with polyamide as base polymer, acrylic resin Acrylic pressure sensitive adhesive with a base polymer, polyolefin pressure sensitive adhesive with a base polymer such as polyethylene, ultra-low density polyethylene, polypropylene, ethylene-α olefin, ethylene-vinyl acetate copolymer, 1,2-polybutadiene 1,2-polybutadiene as a base polymer -Based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives based on polyurethane, pressure-sensitive adhesives composed of these modified materials with improved adhesiveness and stability, or mixtures of two or more of these pressure-sensitive adhesives It is done. Moreover, the adhesive layer comprised from the adhesive layer comprised from the foamed adhesive and the bridge | crosslinking of an adhesive can also be used.
The hot-melt pressure-sensitive adhesive includes a non-aromatic hot-melt pressure-sensitive adhesive and an aromatic hot-melt pressure-sensitive adhesive.
The non-aromatic hot-melt pressure-sensitive adhesive is not particularly limited as long as the base polymer does not contain an aromatic ring. Examples include olefinic 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 such as olefins and dienes. An example is an olefin polymer. The olefin polymer is a polymer or copolymer of ethylene or α-olefin. Moreover, what added dienes, such as a butadiene and isoprene, as another monomer may be used.
The α-olefin is not particularly limited as long as it is a monomer having a double bond at the terminal, and examples thereof include propylene, butene, heptene, hexene, octene and the like.
The aromatic hot-melt pressure-sensitive adhesive is a hot-melt pressure-sensitive adhesive whose base polymer contains an aromatic ring, and a styrene-based hot-melt pressure-sensitive adhesive represented by an ABA type block copolymer. Etc. are mentioned as an example.
In the ABA type block copolymer, the A block is a monovinyl-substituted aromatic compound A such as styrene or methylstyrene, which is an inelastic polymer block, and the B block is the elasticity of a conjugated diene such as butadiene or isoprene. Specifically, for example, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), or hydrogenated types thereof (SEBS, SIPS) In addition, these may be used in combination.
A pressure-sensitive adhesive layer in which a water-absorbing polymer is further blended with the non-hydrophilic pressure-sensitive adhesive can also be used as a measure for preventing a decrease in pressure-sensitive adhesive force due to an increase in water content of the non-hydrophilic pressure-sensitive adhesive layer.
The hydrophilic pressure-sensitive adhesive constituting the hydrophilic pressure-sensitive adhesive layer is not particularly limited as long as it has adhesiveness with a hydrophilic polymer or a water-soluble polymer as a main component and is hydrophilic as the pressure-sensitive adhesive.
As a component of the hydrophilic pressure-sensitive adhesive, hydrophilic polymers such as polyacrylic acid, water-soluble polymers such as sodium polyacrylate and polyvinylpyrrolidone, cross-linking agents such as dry aluminum hydroxide and metal aluminate metasilicate, 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 monoglyceride, olive oil, etc. Oily ingredients such as vegetable oils, preservatives such as methyl paraoxybenzoate and propyl paraoxybenzoate, solubilizers such as N-methyl-2-pyrrolidone, thickeners such as carboxymethylcellulose, polyoxyethylene hydrogenated castor oil, Sorbitan fatty acid es Surfactant such as rutile, oxycarboxylic acid such as tartaric acid, light anhydrous silicic acid, water-absorbing polymer, excipient such as kaolin, moisturizer such as D-sorbitol, sodium edetate, paraoxybenzoic acid ester, tartaric acid, etc. Examples include stabilizers, cross-linked water-absorbing polymers, boron compounds such as boric acid, water, and the like. Moreover, it is comprised from these arbitrary combinations.
Further, the method for providing the adhesive layer is not limited as long as the air flow adjusting material can be fixed, and may be provided on the entire surface, or may be provided partially or intermittently. Various shapes such as a net shape, a stripe shape, a dot shape, and a belt shape are listed as examples.
Moreover, when the adhesive layer is a hydrophilic adhesive layer, if there is a difference in water retention between the hydrophilic adhesive layer and the exothermic composition molded body, a packaging material such as a base material between them Moisture movement takes place via this, and inconvenience occurs for both. This happens especially during storage. In order to prevent this, it is preferable that the packaging material interposed between them has a moisture permeability of at least 2 g / m ² / day in terms of moisture permeability according to the Lissy method (Lyssy method). By using this, when the heating element is stored and stored in the outer bag which is a non-breathable storage bag, moisture movement can be prevented.
When a hydrophilic pressure-sensitive adhesive layer is used for the pressure-sensitive adhesive layer, the moisture permeability of the moisture-proof packaging material provided between the exothermic composition molded body and the hydrophilic pressure-sensitive adhesive layer is within a range that does not affect the heat generation performance. Is not limited as long as it can be prevented from moving, but it is usually 2.0 g / m ² / day or less, preferably 1.0 g / m ² / day or less, in terms of moisture permeability by the Lissy method (Lyssy method). It is preferably 0.5 g / m ² / day or less, and more preferably 0.01 to 0.5 g / m ² / day. Here, it is a value under the conditions of 40 ° C. and 90% RH under atmospheric pressure. In addition, the said moisture-proof packaging material can be used as a base material or a covering material, and may be laminated on the base material or the covering material alone.
The moisture-proof packaging material is not limited as long as moisture movement between the exothermic composition molded body and the hydrophilic pressure-sensitive adhesive layer can be prevented, but a metal vapor-deposited film, a metal oxide vapor-deposited film, a metal foil laminate film, EVOH ( (Ethylene / vinyl alcohol copolymer, saponified ethylene / vinyl acetate copolymer) film, biaxially stretched polyvinyl alcohol film, polyvinylidene chloride coated film, poly (vinylidene chloride) Metal foil such as vinylidene chloride coated film, aluminum foil, non-breathable packaging material formed by vacuum deposition or sputtering of metal such as aluminum on polyester film substrate, silicon oxide, aluminum oxide on flexible plastic substrate One packaging laminate using a transparent barrier film with a structure And the like as. Non-breathable packaging materials used for the outer bag and the like can also be used.
When a water-containing hydrophilic pressure sensitive adhesive (gel, etc.) is used for the pressure sensitive adhesive layer, a reaction accelerator such as sodium chloride in the heat generating composition is used to adjust the water balance between the heat generating composition and the pressure sensitive adhesive layer. The content of the water-absorbing polymer or other substance having a water securing ability may be adjusted within a range where the difference in critical humidity is 2% or less with respect to the exothermic composition.
Here, the critical humidity is a humidity at which the hydrophilic pressure-sensitive adhesive (gel, etc.) and the exothermic composition are in water equilibrium in the environment in an environment where the humidity is arbitrarily set at 30 ± 3 ° C. That is. That is, the difference in critical humidity of 2% or less means that the difference is 2% or less with respect to the humidity that provides the water balance obtained for the hydrophilic adhesive and the exothermic composition.
In addition, as a pressure-sensitive adhesive having good moisture permeability and low irritation to the skin, a water-containing pressure-sensitive adhesive (hydrophilic pressure-sensitive adhesive, gel), a pressure-sensitive adhesive capable of hot melt coating, and a rubber-based pressure-sensitive adhesive are also useful.
The method for providing the pressure-sensitive adhesive layer is not limited as long as the heating element can be fixed, and may be provided on the entire surface excluding the cuts, or may be provided partially or intermittently. Various shapes such as a net shape, a stripe shape, a dot shape, and a belt shape are listed as examples.

Since the heating element of the present invention can be obtained in various shapes, thicknesses, and temperature zones, in addition to normal body warming, it is for joints, facial use, eyes, thermal compresses, drug warmers, necks, waists , For gloves, for heels, or for alleviating symptoms such as shoulder pain, muscle pain, and menstrual pain, for thermal sheets, and for abdomen. Furthermore, it can be used for heating and keeping warm for pets.

For example, when used for symptom relief, the heating element of the present invention is applied directly to a necessary part of the body or indirectly through clothing, cloth or the like.
Examples of muscle and skeletal pain include acute muscle pain, acute skeletal pain, acute related pain, past muscle pain, past skeletal pain, chronic related pain, joint pain such as knee and elbow, and the like.
When the heating element is directly applied to a necessary part of the body, the duration is not limited, but it is preferably 1 to 24 hours, more preferably 3 to 20 hours.
The sustained temperature is not limited, but is preferably 30 to 50 ° C, more preferably 35 to 45 ° C.
Further, when the heating element is applied to the body indirectly through clothing, cloth, etc., the duration is not limited, but is preferably 1 to 24 hours, more preferably 3 to 20 hours.
The duration is not limited, but is preferably 30 to 80 ° C, more preferably 40 to 70 ° C.

The heating element described above can be manufactured, for example, by the following method.
A base material is transported by a base material transport means such as a roller belt, and a mold having a plurality of through holes is placed on the base material so that a heat generating portion can be formed on the base material, and a heat generating composition is placed in the mold. After being put in, the exothermic composition overflowing from the mold is worn away. After the mold is removed, the heat generating composition is covered with a covering material from above the divided heat generating portions arranged on the substrate at a predetermined interval, and the periphery of each heat generating composition is sealed by heat sealing or the like. Then, an adhesive part is provided in a base material or a covering material, and a notch is provided between the adhesive part and the heat generating part by the above-described incision disposing means.
In the example described, the adhesive portion is provided on the base material or the like on the production line. However, the base material or the like provided with the adhesive portion in advance may be used.

Next, evaluation when a notch is provided in the heating element of the present invention will be described below.
In the following description, a base material (material: rayon nonwoven 55 g / m ² ; model number: RE3 manufactured by Ferrick Co., Ltd.) S and a breathable film (material: nylon spunbond 35 g / m ²⁾ Ntto Denko Co., Ltd. model number: BRN2310) was heat sealed (seal strength; 1.2 kgf / 15 mm (based on JIS Z 1707 7.5 heat seal strength test)) Tests and evaluations were performed by expressing them as samples.
In addition, although the adhesive portion is not provided in the sample, for convenience of explanation, the reference direction that is the front-rear direction of the adhesive portion is defined as a vertical direction, and the direction orthogonal to this direction is described as a horizontal direction.

The contents of the test were the following (a) to (d).
(A) Measurement in Deviation Direction As shown in FIG. 11, the chucking fixing portion 11 having a width of 22.5 mm and a length of 15 mm is provided at each diagonal position of the rectangular body 10 having a width of 70 mm and a length of 70 mm. The structure was mounted on a tensile testing machine, and the stress was measured when it was stretched 100% one minute after the start of the tensile test and stretched at a speed at which the chucking interval was 140 mm.
The “deviation direction” in this evaluation refers to the direction in which the heat generating part moves relative to the adhesive part with reference to the direction in which the heat generating part and the adhesive part are adjacent to each other. In the following example, the direction is the vertical direction of the center line C. .
For the evaluation, a load-elongation curve was drawn, and the elongation rate (%) at 5N load obtained from this curve was used as a reference. Regarding S sample, less than 6.7% can be used, but there is no gap and there is a sense of incongruity (×), and in the case of 6.7% or more, there is a gap and there is almost no sense of incongruity (○); The case was evaluated as more preferable (no discomfort) (◎). Regarding W samples, less than 3.3% can be used, but there is no deviation and there is a sense of incongruity (×). In the case of 3.3% or more, there is a deviation and there is almost no sense of incongruity (○), 8.3% The above cases were evaluated as more preferable (no discomfort) (◎).

(B) Measurement of breaking stress in deviation direction During the measurement of (a) above, the maximum value of the stress when the sample broke without causing a certain deviation was measured as the breaking strength.
When the breaking strength was less than 20N, the linear cut portion was likely to be broken, so that it could not be used (X), 20N or more could be used (O), and 30N or more was evaluated as more preferable (A).

(C) Measurement of lateral extension As shown in FIG. 12, 10 mm width on both sides of the rectangular body 12 (width 70 mm, length 70 mm) was attached to a tensile tester as chucking portions 12a and 12b. One minute after the start of the tensile test, the stress was measured when the film was stretched 100% and stretched at a speed at which the chucking interval was 100 mm.
The measurement of “lateral extension” in this evaluation is for measuring the degree of extension of the heat generating part and the adhesive part in the adjacent direction.
For the evaluation, a load-elongation curve was drawn, and the elongation rate (%) at 10 N load obtained from this curve was used as a reference. For S sample, less than 4.2% does not stretch and easily falls off, so it cannot be used (×), 4.2% or more can be used with extensibility (○), and more than 5.0% It was evaluated as preferred (◎). In addition, for W samples, it cannot be used because it does not stretch below 1.7% and easily falls off (x), when it is 1.7% or more, it can be used with stretchability (○), when it is 2.5% or more Was evaluated as more preferable (◎).

(D) Measurement of breaking stress in the transverse direction During the measurement of (c) above, the maximum value of the stress when the sample failed to elongate beyond a certain level and was broken was measured as the breaking strength.
When the breaking strength was less than 20N, the linear cut portion was likely to be broken, so that it could not be used (X), 20N or more could be used (O), and 30N or more was evaluated as more preferable (A).
The measurement environments (a) to (d) are under the atmosphere of temperature: 20 ± 3 ° C. and humidity: 65 ± 5%, and a universal tensile tester (manufactured by Instron Japan Co., Ltd.) as a tensile tester. Model No. 5565 (load cell; 5 kN)) was used. The sample was measured in accordance with the tensile test JIS L1096 (L1096: 1999, 8.14.1 elongation rate a) method A (constant speed elongation method)).

(E) Observation of lifting of packaging material when misalignment occurs As shown in FIG. 13, a super strong double-sided tape having a width of 10 mm at both end portions 2L and 2R of a rectangular sample having a width of 65 mm and a length of 70 mm (in this test, JIS A super-strength double-sided tape defined by Z1541) was used. The sample was provided with a cut so that the cut line end portion was positioned on a straight line S parallel to the center line C at a distance of 12 mm from one side end (end portion 2R side).
Each of the two end portions 2L and 2R of the sample is fixed to a separate movable flat plate (a stainless steel plate having a thickness of about 0.5 mm, etc., a straight ruler defined in JIS B7514 in this test) via a super strong double-sided tape. Thus, both end portions 2L and 2R were pulled in a direction parallel to the center line C and away from each other. In addition, the pulled distance is different between the two types of samples S and W. The S sample is 5 mm (equivalent to an elongation rate of 7.1%), and the W sample is 3 mm (elongation rate is 4.3%). Equivalent). In addition, this movement does not necessarily need to move both side edge parts 2L and 2R, and may fix one edge part and move the other edge part.
When the above-mentioned tension was performed, the shape after the cut was deformed was observed, and a case where there was no crushing was evaluated as ◯, and a case where crushing was performed was evaluated as x.

[Evaluation 1]
As shown in FIG. 14, along the center line C of the sample, a cut was provided under the following conditions, and the evaluations (a) to (d) and the presence or absence of deviation were visually confirmed. The results are shown in Table 1. Show.
(1) Evaluation of the length of the cut As shown in A1 to A12 of FIG. 14, the cut was provided along the center line C of the sample under the following conditions. Note that A1 is not provided with a cut for comparison with A2 to A12.
-Number of columns: 1 row-Angle: 70 ° (The counterclockwise direction with respect to the horizontal line perpendicular to the center line C is positive. The same shall apply hereinafter.)
・ Spacing (As shown in FIG. 11, the spacing between the same ends between the cuts arranged in the direction of the center line C is the same spacing t. The same applies hereinafter): 9 mm
-Number: 6-Length: Length shown in Table 1 (unit: mm)
(2) Evaluation of cut angle As shown in B1 to B12 of FIG. 14, cuts were made along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
-Interval: 9 mm, and 20 mm for the B12 sample.
-Number: 6 pieces, and for the B12 sample, 3 cuts were made.
・ Angle: Angle shown in Table 1 (Unit: °)
As shown in FIG. 11, this angle is described with the counterclockwise direction being positive and the clockwise direction being negative with respect to the horizontal line P.
(3) Evaluation of Notch Interval As shown in C1 to C9 of FIG. 14, the notch was provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
Interval: Interval shown in Table 1. Number of lines: C1 to C4 in Table 1 were 6, C5 and C6 were 4, and C7 to C9 were 3.
(4) Evaluation of the number of cuts As shown in D1 to D5 of FIG. 14, cuts were provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: 9mm
Number: Number shown in D1 to D5 in Table 1

From Table 1 above, deviations from A3 to A12 were confirmed. Considering the breaking strength in conjunction with the evaluation of the deviation direction, it was found that the length of the linear cut is preferably 6 mm to 16 mm. It has been found that the angle is preferably 58 ° to 75 °. It was found that the distance is preferably 4 mm to 24 mm. It was found that the number is preferably 3-6.

[Evaluation 2]
Next, an example in which both ends of the linear cut are bent along the direction of the center line C will be described. As shown in FIG. 15, the evaluations (a) to (d) were performed along the center line C of the sample under the following conditions, and evaluations (a) to (d) were performed. The results are shown in Table 2. In addition, the length of the bent part was 2 mm at one end.

(1) Evaluation of cut length As shown in AK1 to AK8 in FIG. 15, cuts were provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Angle: 70 ° (An angle formed by the line connecting the ends of the bent ends and the center line C is set. The same applies hereinafter.)
・ Interval: 9mm
-Number: 6-Length: Length shown in AK1 to AK8 in Table 2 (unit: mm) (The length includes the length of the bent ends. The same shall apply hereinafter.)
(2) Evaluation of cut angle As shown by BK1 to BK8 in FIG. 15, cuts were provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Interval: 9mm
-Number: 6-Angle: Angle shown in BK1 to BK8 in Table 2 (unit: °)
(3) Evaluation of notch interval As shown by CK1 to CK5 in FIG. 15, the notch was provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: Interval shown in CK1 to CK5 in Table 2 (unit: mm)
Number: CK1 to CK3 in Table 2 were 6, CK4 was 4, and CK5 was 3.
(4) Evaluation of the number of cuts As shown in DK1 to DK5 in FIG. 15, cuts were provided along the center line C of the sample under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: 9mm
Number: Number shown in DK1 to DK5 in Table 2 (5) Evaluation of Modification Example A modification example of AK6 in FIG. 15 was provided with cuts under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: 9mm
-Number: 6-Shape AK6a: For a linear notch along the center line C, a bent part is provided in a direction away from the notch from both ends, and a curve is formed between the linear notch and the bent part. Connected.
AK6b: A bent portion extending in the horizontal direction from both ends of the linear cut along the center line C was provided.
AK6c: With respect to the linear cut along the center line C, a bent portion was provided in a direction approaching the cut from both ends thereof.

From Table 2, it was found that when the both ends of the inclined linear cut were bent in the direction of the center line C, the cut length was preferably 8 to 18 mm. It has been found that the angle is preferably 60 ° to 75 °. It has been found that the interval is preferably 4 to 24 mm. It was found that the number is preferably 3-6. Further, it was found that the direction of the bent portion can be bent from the horizontal direction to the vertical direction toward the end portion near the inclined notch.

[Evaluation 3]
As shown in FIG. 16, evaluations (a) to (d) were performed along the center line C of the sample under the following conditions, and evaluations (a) to (d) were performed. The results are shown in Table 3.
-Number of rows: 1 row-Length: 15mm
・ Interval: 9mm
-Number: 6-Angle: As shown in Table 3, the angle formed by the line connecting both ends of the arc and the center line C was set.
Curved shape (convex direction): a convex shape on the lower side and a convex shape on the upper side with respect to the upper and lower sides of the center line C.
-Curvature radius: 12 mm for BR12 in Table 3, 20 mm for BR20, and 40 mm for BR40.

From Table 3, it was confirmed that all of the W and S samples were misaligned. In consideration of breaking strength and the like along with the evaluation of the deviation direction, it was found that the curve shape is convex downward, the radius of curvature is 12 mm and 20 mm, the angle is 60 °, and the radius of curvature is 40 mm, the angle is preferably 70 °. . It has been found that, when the curved shape is convex upward, angles of 60 ° and 70 ° are preferable when the radius of curvature is 20 mm, and angles of 70 ° are preferable when the radius of curvature is 40 mm.
However, depending on the relationship between the radius of curvature and the angle, if the angle is relatively small, the lateral extension will not be observed, and if the angle is too large, the adjacent distance between adjacent notches will be small, and the breaking strength will be obtained. There is a tendency to become impossible.

[Evaluation 4]
As shown in F1 to F5 in FIG. 17, the evaluations (a) to (b) were made along the center line C of the sample under the following conditions, and the results are shown in Table 4.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: 9mm
Number of pieces: 6 Cutout portions: The cutout portions of F1 to F5 are obtained by cutting out the upper and lower sides of the sample in a triangular shape as shown in FIG. 17, and the details are as follows.
F1: It was formed in a triangular shape having a side parallel to the linear cut and a side parallel to the center line. The sides parallel to the linear cuts are set to be the same as the intervals between the other linear cuts, with the point on the center line C as the base point.
F2: It was formed in the same manner as F1 except that the distance between the apex of the triangular cutout and the end of the cut line was 5 mm on the center line C.
F3: Formed in the same manner as F1 except that the side parallel to the linear cut was set 5 mm inside the adjacent linear cut by a distance on the center line C.
F4: A side parallel to the linear notch was formed in the same manner as F1 except that a side shifted by 7 mm from the center line C was provided in a direction in which no linear notch was provided.
F5: The side parallel to the linear notch was formed in the same manner as F1 except that the starting point was a position shifted by 7 mm from the center line C in the direction in which the linear notch was provided.

As shown in Table 4, it was found that the evaluation in the deviation direction was good in the W sample that provides sufficient breaking strength and the F samples F1 and F4 of the S sample. In particular, the position and size of the notch shown in the F4 shape showed almost no decrease in breaking strength and a deviation compared to the A9 (see Table 1 and FIG. 14) shape without the notch. It has been found that the stress of the die becomes extremely small, that is, the feeling of strangeness is hardly felt.
However, depending on the position and size of the notch, it becomes easy to shift, but sufficient breaking strength cannot be obtained, that is, it tends to be easily cut. If the notch is provided on the side opposite to F1 to F4 shown in the F5 shape, the stress at the time of misalignment does not change from the A9 shape, and the breaking strength is reduced. It turned out to be an effect.

[Evaluation 5]
(1) As shown in WA1 to WA4 in FIG. 18, evaluations (c) to (d) were performed with a notch provided under the following conditions across the center line C of the sample, and the results are shown in Table 5.
-Number of rows: 2 rows-Length: 15mm
・ Angle: ± 70 °
・ Interval: 9mm
-Number: 6-Shortest distance between opposing cuts: Length shown in WA1 to WA4 in Table 5 (unit: mm)
(2) As shown in WBK1 to WBK8 in FIG. 18, evaluations (c) to (d) were performed with notches provided under the following conditions across the center line C of the sample, and the results are shown in Table 5.
-Number of rows: 2 rows-Length: 15mm
・ Interval: 9mm
・ Number: 6 ・ Shortest distance between opposing cuts: 3 mm
・ Angle: Angle shown in WBK1 to WBK8 in Table 5 (unit: ± °)

From Table 5, it was found that when a C-shaped cut was provided, the best distance was 1 to 10 mm. In addition, WBK1 to WBK8 are BK1 to BK8 in Table 2 which are formed in two C-shaped rows. Particularly in the S sample, the lateral extensibility of 50 to 58 ° is larger than that in the case of one row. It was also found that the extensibility in the transverse direction was good over a wider range of angles.

[Evaluation 6]
As shown in FIG. 19, an evaluation is made by providing three sets of X-shaped cuts by crossing an angle of ± 70 ° with respect to a reference horizontal line, an interval of 18 mm and a length of 15 mm along the center line (a). To (d), and the results are shown in Table 6.

As shown in Table 6, it was found that the lateral elongation evaluation was inferior. Further, it was also found that this X-shaped notch has a sense of incongruity at the time of sticking because a protrusion is formed inward when the cut is made.

[Evaluation 7]
The W sample of BR40D3 and BR40U3 shown in FIG. 16 (BR40D3 and BR40U3), the S sample of the same shape (SBR40D3 and SBR40U3), the W sample of A9 shape (A9) and the S sample of the same shape shown in FIG. 14 (SA9) ), W sample (AK6) having the shape of AK6 shown in FIG. 15 and S sample (SAK6) having the same shape, and a circle having a curvature radius of 100 mm, which is not shown, but protrudes downward like BR40D3 shown in FIG. W sample BR100D having an arc-shaped cut, S sample SBR 100D of the same shape, BR sample U of W sample having an arc-shaped cut having a convex curvature radius of 100 mm as in BR40U3 shown in FIG. 16, and the same shape Evaluation of SBR100U of S sample Performed e), the pictures from the side, shown in Figure 20.

As shown in FIG. 20, A9 having a linear notch or an arc-like notch that is convex upward with respect to the center line C is super strong on both sides in the thickness (fault) direction when a deviation occurs. It was found that there was a sinking part that did not float away from the tape sticking surface. This means that when the heating element is applied to the skin with an adhesive or the like, it contacts the skin. Therefore, the arc-shaped cuts that are convex downward with respect to the center line C (BR40D3, BR100D), in the direction away from the super-strength double-sided tape sticking surface in the thickness (fault) direction when a deviation occurs. It turned out that it does not cause a sense of incongruity such as lifting and hitting the skin.

[Evaluation 8]
As a modification of AK6a to AK6c in FIG. 15, a cut was provided under the following conditions.
-Number of rows: 1 row-Length: 15mm
・ Angle: 70 °
・ Interval: 9mm
Number of pieces: 6 Shapes: Shapes shown in AK6d to AK6f in FIG. 21 and details are as follows.
AK6d: A linear notch is provided adjacent to the direction of the vertical line S, and a bent portion that is bent away from the other end side (center line C side) of the notch and parallel to the vertical line S is provided.
AK6e: A linear notch is provided adjacent to the direction of the vertical line S, and a bent portion is provided in a direction away from the other end side (center line C side) of the notch and in a direction parallel to the horizontal line P.
AK6f: A linear notch is provided adjacent to the direction of the vertical line S, and a bent portion that is bent in a direction approaching the other end side (center line C side) of the notch and parallel to the vertical line S is provided.

The W samples (AK6d, AK6e, and AK6f) under the above conditions and the S samples (SAK6d, SAK6e, and SAK6f) provided with the same shape of the cut were evaluated (e), and the side and surface photographs are shown in FIG. .

As shown in FIG. 22, it was found that AK6e and AK6f did not float in the direction away from the super-strength double-sided tape adhering surface in the thickness (fault) direction when there was a shift, but had a sinking part. Therefore, when a heating element having such a cut is affixed to the skin with an adhesive or the like, the peripheral portion of the cut will hit the skin. On the other hand, it was found that AK6d floats in the direction away from the super-strong double-sided tape sticking surface in the thickness (fault) direction when the deviation occurs, and does not cause a sense of incongruity such as hitting the skin.

DESCRIPTION OF SYMBOLS 1 Heat generation part 2,2 'Adhesion part 3 Reference line 4 Cut 5 Horizontal line 6 Heat generating composition 7 Base material (packaging material)
8 Covering material (wrapping material)
9 recess

Claims (14)

1. A heating element provided with an adhesive portion on a side of the heat generating portion, wherein a linear notch inclined with respect to the front-rear direction of the adhesive portion is provided between the heat generating portion and the adhesive portion. Characteristic heating element.
2. The heating element according to claim 1, wherein the linear notch is arcuate.
3. The heating element according to claim 1, wherein at least one end of the linear cut is bent.
4. The inclination angle of the notch is in a range of 58 ° to 75 ° or 105 ° to 122 ° counterclockwise with a line perpendicular to the reference direction being 0 °. The heating element described.
5. The heating element according to claim 1, wherein three or more cuts are provided in the front-rear direction of the adhesive portion.
6. The heating element according to claim 1, wherein the heat generating part is configured by housing a heat generating composition in a packaging material having air permeability, and is configured by adjoining a plurality of unit heat generating parts.
7. The heating element according to claim 1, wherein the adhesive part is provided on both sides of the heating part, and the notches are provided on both sides of the heating element.
8. The heating element according to claim 7, wherein the inclining angles of the notches on the both sides are the same.
9. The heating element according to claim 7, wherein the inclining angles of the cuts on both side portions are symmetrical.
10. The heating element according to claim 7, wherein two rows of cuts are provided between the heating part and the adhesive part.
11. The heating element according to claim 10, wherein the two rows of cut lines are formed by a C-shaped cut.
12. The heating element according to claim 1, wherein a curved recess is formed on an outer peripheral edge of the heating element in a direction in which the cut extends.
13. It is a manufacturing method of the heat generating body of Claim 1, Comprising: The said packaging material is comprised from the base material by which the said heat generating composition is arrange | positioned, and the coating | covering material which coat | covers the said heat generating composition, The said notch | incision is the said A method for producing a heating element, wherein the heating element is provided only on a base material, or is provided so as to penetrate both the base material and the covering material.
14. A heating element having a fixing part on a side of the heating part, wherein a linear notch inclined with respect to the front-rear direction of the fixing part is provided between the heating part and the fixing part. Characteristic heating element.

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