JP2013009746A - Heat-generating device and method of using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-generating device which can be attached to clothing with sufficient adhesive force, even if the heat-generating device which has been previously attached to the clothing is reattached.SOLUTION: The heat-generating device 1 which can be attached to clothing after having been attached to the clothing includes: a pouch 2 which houses a heat-generating composition A including an oxidizable metal able to generate heat through contact with the air and has air permeability on one surface; an adhesive layer 3 formed on the other side of the pouch 2; and a first peeling sheet 4 pasted on the adhesive layer 3 so as to cover the adhesive layer 3. The first peeling sheet 4 has end sheet parts 41a, 41b for covering the ends 31a, 31b opposing each other on the adhesive layer 3, respectively; and a central sheet part 42 for covering a central part 32 sandwiched between the ends 31a, 31b of the adhesive layer 3. The end sheet parts 41a, 41b and the central sheet part 42 can be separately peeled from each other.

Description

  The present invention relates to a heating tool and a method of using the same, and more particularly, to a heating tool that can be pasted again on a piece of clothing once pasted.

  Conventionally, a so-called sticking type in which a disposable body warmer filled with a heat generating composition containing an oxidizable metal capable of generating heat by contact with air is attached to clothing inside a flat bag body having a ventilation surface. Are widely used (for example, Patent Document 1). Such a disposable hand warmer is used by forming an adhesive layer on the surface of the bag body that faces the air-permeable surface and affixing it to clothing using the adhesive layer.

JP-A-5-208031

  The disposable warmers of the pasting type have become hot for a long time, so that, for example, those used at the time of commuting or going to school can be used even after returning home. When using a disposable warmer of this type even after returning home, it is usually necessary to reapply the pasted disposable warmer to the clothing after changing because it is changed from clothing at the time of commuting or going to school after returning home There is. However, when the item once attached to the clothing is once removed and then reapplied in this way, the adhesive force of the adhesive layer becomes weak because the fiber or dust of the clothing adheres to the adhesive layer, and it is easily peeled off from the clothing. There's a problem. Then, even if it is a case where what was once affixed on clothing is reapplied again, this invention makes it a subject to provide the heating tool which can be affixed on clothing with sufficient adhesive force.

  The heating tool according to the present invention is a heating tool that can be attached to clothing and can be re-attached, and contains a heat-generating composition containing an oxidizable metal that can generate heat by contact with air, A bag body having air permeability on one side, an adhesive layer formed on the other side of the bag body, and a release sheet attached to cover the adhesive layer, wherein the release sheet is the adhesive layer The end sheet portion covering the opposite end portions, and the central sheet portion covering the central portion sandwiched between the end portions of the adhesive layer, the end sheet portion and the central sheet portion Can be separated and peeled off.

  In the heating tool configured as described above, first, as the first application, the application is applied to clothing using each end of the adhesive layer exposed by peeling off the end sheet. And as a second attachment, if you want to attach to new clothing by changing clothes, etc., peel off the heating tool from the clothing once, peel off the central sheet part and expose the central part of the adhesive layer newly, Using the center of the adhesive layer and each end of the adhesive layer used for the first application, the adhesive layer is applied to a new garment. Thereby, even if it is affixing the second time, a heating tool can be affixed on clothing with sufficient adhesive force.

  The ratio of the total area of each end to the area of the entire adhesive layer is preferably 62.5 to 87.5%, and more preferably 75 to 87.5%. By setting it as such an area ratio, the adhesive force of 1st sticking and 2nd sticking can be made comparable. As a result, by appropriately setting the adhesive strength, the heating tool can be attached to the clothing with sufficient adhesive strength in both the first and second times, and the heating tool is peeled off from the clothing. It can also prevent damage to clothing. Further, by making the ratio of the total area of the respective end portions to the area of the entire adhesive layer smaller than 87.5%, the central sheet portion is peeled off at the same time as the end portion sheet portion at the time of the first attachment. This can be prevented. In addition, the area of the whole adhesion layer means the area which totaled the area of each edge part, and the area of a center part.

  Moreover, it is preferable that the average adhesive force of each edge part of the said adhesion layer and the average adhesive force of the center part of an adhesion layer shall be 10-30N, respectively. Thus, by making each adhesive force 10N or more, clothing can be sufficiently adhered, and when each adhesive force is made 30N or less, clothing is damaged when the attached heating tool is peeled off. Can be prevented.

  The pressure-sensitive adhesive layer may be an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicon-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or the like, and among them, may be formed of a rubber-based pressure-sensitive adhesive. preferable. The rubber-based pressure-sensitive adhesive has a small change in the pressure-sensitive adhesive force with respect to the heat generated from the exothermic composition. That is, the adhesive strength when the exothermic composition generates heat does not change greatly, and it becomes easy to control the adhesive strength to an appropriate value. Examples of rubber-based pressure-sensitive adhesives include natural rubber, synthetic rubbers such as SIS (styrene-isoprene-styrene) and SBR (styrene / butadiene rubber), but SIS is superior in hot melt processing. It is preferable to use a synthetic rubber.

  Moreover, the boundary of the edge part sheet | seat part and center sheet | seat part of the said peeling sheet can also be made into a waveform. By forming the waveform in this way, the boundary line between the first and second adhesive surfaces becomes intricate, and the adhesive force applied to the clothing can be dispersed.

  Further, the bag body is preferably a hydrophobic nonwoven fabric on one side. Since the hydrophobic nonwoven fabric is difficult to absorb water, the product can be prevented from warping when the disposable body warmer is used. Pasting can be performed easily. In addition, examples of the hydrophobic nonwoven fabric include polyester, acrylic, polyolefin, polypropylene, and the like, and polyester (polyethylene terephthalate) can be used in terms of less warping of the product.

  Moreover, it is preferable to form a non-adhesion part in the boundary part of each edge part and center part in the said adhesion layer. By configuring in this way, the end sheet portion and the central sheet portion of the release sheet can be easily peeled off, and when the heating tool once pasted for the second pasting is peeled off from the clothes, A finger can be inserted from the adhesive portion, and the heating tool can be easily peeled off. The non-adhesive part may be a part where the adhesive layer is not formed, or by first forming the adhesive layer and attaching or applying a non-adhesive material to the boundary part. It may be formed.

  Moreover, it is preferable that the edge part sheet | seat part and center sheet | seat part of the said peeling sheet are extended along the longitudinal direction of a bag. By comprising in this way, a heating tool can be stably affixed on clothing in the 1st affixing.

  The method of using the heating tool according to the present invention is a method of using any one of the heating tools described above, wherein the end sheet is peeled off to expose each end of the adhesive layer and to be attached to clothing. Then, after the first step, the heating tool is peeled off from the clothing, the central sheet portion is peeled off, and the heating tool is attached to the clothing using the center portion and the end portions of the adhesive layer. And including.

  According to the present invention, even when the heating tool once pasted on the clothing is pasted again, it can be pasted on the clothing again with sufficient adhesive force.

FIG. 1 is a plan view of a heating tool according to the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a plan view of the heating tool in a state where the release sheet according to this embodiment is peeled off. FIG. 4 is a plan view showing a modification of the heating tool according to the present embodiment. FIG. 5 is a plan view showing another modification of the heating tool according to the present embodiment. FIG. 6 is a plan view showing still another modification of the heating tool according to the present embodiment.

  Hereinafter, an embodiment of a heating tool according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the heating tool 1 includes a bag body 2, an adhesive layer 3 formed on the upper surface of the bag body 2, and a release sheet 4 that covers the adhesive layer 3.

(Bag)
As shown in FIG. 2, the bag body 2 is configured in a flat bag shape by bonding the outer peripheral edges of the first sheet 21 and the second sheet 22 having a rectangular shape in plan view by heat sealing or the like. The exothermic composition A is filled inside. The 1st sheet | seat 21 is comprised from the sheet | seat which has air permeability, for example, the water-vapor permeability measured by A method (humidity sensor method) prescribed | regulated to JISK7129 is about 100-2000 g / m < ² > * day. A sheet is preferable, and it is more preferably about 200 to 1000 g / m ² · day. Such a first sheet 21 may have a single layer configuration or a multilayer configuration. When setting it as a multilayer structure, the 1st sheet | seat 21 can be made into the lamination sheet which laminated | stacked the porous film and the nonwoven fabric, for example, and arrange | positions a porous film so that a heat-generating composition may be contact | connected in this case. Examples of the material for such a porous film include urethane, polyethylene, and polypropylene. Examples of the material for the nonwoven fabric include polyester, polypropylene, nylon, rayon, and polyolefin. Moreover, the 2nd sheet | seat 22 is comprised from the non-breathable sheet | seat, may be a single | mono layer structure, and may be a multilayered structure. When the second sheet 22 has a multilayer structure, for example, polyethylene copolymerized with a metallocene catalyst is placed on the sealant layer to be fixed to the first sheet 21, and an intermediate layer is formed on the top surface of the sealant layer by milking. By doing so, it is possible to increase the concealability of the exothermic composition, and to form a laminated polyethylene having an improved adhesion processability as a surface layer on the upper surface of the intermediate layer.

(Exothermic composition)
The exothermic composition A filled in the bag body 2 may be anything that generates heat upon contact with air. For example, a composition containing iron powder, a water retention agent, a metal salt, and water may be used. it can. In addition, as for the total mass of the iron powder in the exothermic composition A, a water retention agent, a metal salt, and water, about 80-100 mass% is preferable. In addition, this ironing tool 1 can exhibit a thermal effect because iron powder reacts with oxygen in air and generates heat.

  Examples of iron powder include reduced iron and cast iron. These can be used individually by 1 type or in combination of 2 or more types. Examples of the shape of the iron powder include granular and fibrous forms. These forms of iron powder may be used alone or in combination of two or more. The particle size of the granular iron powder is preferably about 10 to 300 μm, preferably about 10 to 100 μm. In addition, the particle diameter described in the present specification is obtained by providing a sample (iron powder or the like) 100 g to be measured with a sieve of 700 μm, 650 μm, 500 μm, 400 μm, 300 μm, 250 μm, 100 μm, 50 μm, 10 μm in order from the top. It can be calculated by measuring the amount remaining on each sieve and the amount passed through after passing through an electric vibration sieve and vibrating for 15 minutes. For example, when iron powder having a particle size of 10 to 300 μm is used, all of the 300 μm sieve may be passed and the iron powder remaining on any or all of 10 to 250 μm may be used. About 30-80 mass% is preferable and, as for content of the said iron powder in heat_generation | fever, about 45-65 mass% is more preferable.

  The water retention agent in the exothermic composition is a substance having a function of retaining water. As a water retention agent, a porous substance, a water absorbing resin, etc. can be mentioned, for example. Specific examples of the porous material include activated carbon, wood powder, perlite, vermiculite, leechite, and the like. Activated carbon can take air into the micropores on the surface to promote the supply of oxygen, or keep the heat so that the heat radiation temperature does not vary. Activated carbon has a very porous internal structure and therefore provides particularly good water retention. Furthermore, activated carbon not only absorbs water well, but also absorbs water vapor evaporated by the generation of heat of the exothermic composition, and helps prevent escape of water vapor. Thus, activated carbon can also serve as a water retention material. Furthermore, activated carbon can also absorb the odor caused by the oxidation of iron powder. As the activated carbon, for example, activated carbon prepared from coconut shell, wood, charcoal, coal, bone charcoal and the like can be suitably used. Examples of the shape of the activated carbon include granular and fibrous shapes. These activated carbons may be used alone or in combination of two or more. In particular, in the present invention, it is preferable to use granular activated carbon. When using granular activated carbon, the particle size is preferably about 10 to 300 μm, and more preferably about 10 to 100 μm. About the measuring method of the said particle size, it is the same as that of the case of the particle size of the said iron powder. Further, the shape of wood powder, pearlite, vermiculite, and leechite is not particularly limited as long as water can be retained, but a granular shape is preferable in order to enhance the feeling of use of the heating tool. When using a granular thing about wood flour, perlite, vermiculite, and leeches, the particle size is about 300 micrometers or less normally, Preferably it is about 250 micrometers or less. The method for measuring the particle size is the same as that for the iron powder. Among these porous materials, preferred are activated carbon, leechite and vermiculite, more preferred activated carbon and leechite, and particularly preferred activated carbon. These porous materials may be used alone or in combination of two or more.

  Specific examples of water-absorbing resins used as water retention agents include isobutylene-maleic anhydride copolymer, polyvinyl alcohol-acrylic acid copolymer, starch-acrylate graft copolymer, and polyacrylic acid. Examples thereof include a salt cross-linked product, an acrylate-acrylic acid ester copolymer, an acrylate-acrylamide copolymer, and a polyacrylonitrile salt cross-linked product. Among these water-absorbent resins, a cross-linked polyacrylate is preferable. The particle size of the water absorbent resin is usually about 100 to 500 μm, preferably about 250 to 400 μm. About the measuring method of the said particle size, it is the same as that of the case of the particle size of the said iron powder. These water-absorbing resins can be used singly or in combination of two or more. As the water retention agent, any one of a porous substance and a water absorbent resin may be used, or a combination thereof may be used. The water retention agent used in the exothermic composition is preferably a porous material, a combination of a porous material and a water absorbent resin; more preferably activated carbon, activated carbon and another porous material (porous material other than activated carbon) and water absorption. The combination of the functional resin, more preferably, the combination of activated carbon, leechite and polyacrylate cross-linked product is exemplified.

  The content of the water retention agent in the exothermic composition is preferably about 2 to 30% by mass, and more preferably about 5 to 20% by mass. More specifically, if a porous substance is used alone as the water retention agent, the content in the exothermic composition is preferably 10 to 30% by mass, and more preferably about 10 to 20% by mass. Moreover, if a water absorbing resin is used alone as the water retention agent, the content in the exothermic composition is preferably 2 to 10% by mass, and more preferably about 2 to 7% by mass. Moreover, if the porous material and the water absorbent resin are used in combination as the water retention agent, the content in the exothermic composition is 5 to 20% by weight of the porous material and 1 to 10% by weight of the water absorbent resin. Preferably, the porous material is 7 to 20% by mass and the water absorbent resin is 1 to 5% by mass. In particular, if a combination of activated carbon, other porous material and a water-absorbing resin is used as a water retention agent, activated carbon 3-20% by mass, other porous material 1-10% by mass, water-absorbing resin 1- 10 mass% is preferable, 5-15 mass% of activated carbon, 1-5 mass% of another porous substance, and 1-5 mass% of water absorbing resin are more preferable.

  In order to facilitate the oxidation reaction with air, the metal salt can activate the surface of the iron powder to promote the oxidation reaction of iron. As such a metal salt, a metal salt used in a known exothermic composition may be used. For example, sulfate such as ferric sulfate, potassium sulfate, sodium sulfate, manganese sulfate, magnesium sulfate; Examples include cupric chloride, potassium chloride, sodium chloride, calcium chloride, manganese chloride, magnesium chloride, cuprous chloride and the like. Carbonates, acetates, nitrates and other salts can also be used. About these metal salts, it can be used individually by 1 type or in combination of 2 or more types. The particle diameter of the metal salt is usually about 100 to 700 μm, preferably about 250 to 650 μm. About the measuring method of the said particle size, it is the same as that of the case of the particle size of the said iron powder. Moreover, about 0.5-10 mass% is preferable, and, as for content of the metal salt in the exothermic composition A, about 1-3 mass% is more preferable.

  As water, distilled water, tap water, etc. can be used, for example. The content of water in the exothermic composition is preferably about 1 to 40% by mass, and more preferably about 20 to 30% by mass.

  Moreover, exothermic composition A may contain the other additive which can be mix | blended with an exothermic composition as needed other than the said component. The exothermic composition A can be prepared by mixing the above components. Mixing may be performed under vacuum or in an inert gas atmosphere as necessary, and may be performed, for example, according to the method described in US Pat. No. 4,649,895.

(Adhesive layer)
The pressure-sensitive adhesive layer 3 is formed on the outer surface of the second sheet 22. For example, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, or a pine resin is applied to the second sheet 22. Can be formed. The pressure-sensitive adhesive is preferably applied so that the pressure-sensitive adhesive has a thickness of about 40 to 70 μm. As will be described later, the adhesive layer 3 can be divided into opposing end portions 31a and 31b and a central portion 32 sandwiched between the end portions 31a and 31b (see FIG. 3). And the non-adhesion part 33 is formed in the boundary part of each edge part 31a, 31b and the center part 32. FIG. The non-adhesive portion 33 is formed by, for example, not forming the adhesive layer 3 only in that portion, or by applying a non-adhesive substance on the adhesive layer 3 once the adhesive layer 3 is formed. Can be formed. By forming the non-adhesive part 33 in this way, the release sheet 4 can be easily peeled from the non-adhesive part 33, and the heating tool 1 once applied for the second application is peeled off from the clothes. At this time, a finger can be inserted from the non-adhesive portion 33, and the heating tool can be easily peeled off. Specific examples of rubber-based pressure-sensitive adhesives include natural rubber and synthetic rubbers such as SIS (styrene-isoprene-styrene) and SBR (styrene-butadiene rubber).

(Peeling sheet)
The release sheet 4 is a sheet for covering the pressure-sensitive adhesive layer 3. For example, paper, polyethylene terephthalate, polyethylene or the like is laminated alone or in combination, and silicon processing is performed on the surface covering these pressure-sensitive adhesive layers 3. Can be formed. The release sheet 4 includes end sheet portions 41a and 41b which are end portions on opposite long sides, and a central sheet portion 42 sandwiched between the end sheet portions 41a and 41b. And the area | region of the adhesion layer 3 covered with the edge part sheet | seat parts 41a and 41b is made into edge part 31a, 31b, and the area | region of the adhesion layer 3 covered with the center sheet | seat part 42 is made into the center part 32. In addition, each edge part sheet | seat part 41a, 41b and the center sheet | seat part 42 are isolate | separated so that it can peel separately. Adhesion covered by each end sheet portion 41a, 41b with respect to the entire area of the adhesive layer 3 (the total area of each end portion 31a, 31b, central portion 32, not including the non-adhesive portion 33) The ratio of the total area of the end portions 31a and 31b of the layer 3 is preferably about 62.5 to 87.5%, and more preferably about 75.0 to 87.5%. By setting it as such an area ratio, the difference between the adhesive force when applied for the first time and the adhesive force when applied for the second time can be within 10 N, as described later. By adjusting the adhesive strength of the layer 3, the heating tool 1 can be sufficiently adhered to the clothing in both the first and second bonding, and the clothing is damaged when the heating tool 1 is peeled off from the clothing. There is nothing. In addition, it is preferable that the total adhesive force of each edge part 31a, 31b of the adhesion layer 3 and the adhesive force of the center part 32 shall be 10-30N. By making the range of the adhesive strength in this way, the heating tool 1 is attached to the clothing with sufficient adhesive strength, and the clothing is not damaged when it is peeled off from the clothing. The release sheet 4 is separated into end sheet portions 41 a and 41 b and a central sheet portion 42 along the longitudinal direction of the bag body 2.

  Next, the usage method of the heating tool 1 mentioned above is demonstrated.

  Since the exothermic composition A generates heat in the presence of air, the heating tool 1 needs to prevent contact with air before use, and is usually in an airtight package that does not allow air to pass through. In use, the package is opened and the heating tool 1 is taken out.

  In order to apply the heating tool 1 taken out from the package to clothing, as the first application, first, the end sheet portions 41a and 41b of the release sheet 4 are peeled off, and the end portions 31a and 31b of the adhesive layer 3 are exposed. Let it stick to clothing. And when it is necessary to re-apply the heating tool 1 by changing clothes, etc., the heating tool 1 is peeled off from clothing and the center sheet | seat part 42 of the peeling sheet 4 is peeled as 2nd sticking. And using the center part 32 of the adhesion layer 3 newly exposed by peeling the center sheet | seat part 42, and each edge part 31a, 31b of the adhesion layer 3 used in the case of the 1st sticking Then, the heating tool 1 is attached to the clothing.

  As described above, according to the heating tool 1 according to the present embodiment, when pasting for the first time, only the end portions 31a and 31b of the adhesive layer 3 are used for pasting to the clothing, and when the second pasting is performed. Since the central portion 32 of the adhesive layer 3 can be newly exposed and affixed to the clothing, the heating tool 1 can be affixed to the clothing with a sufficient adhesive force even when it is applied for the second time. Moreover, by making the total area of each end part 31a, 31b with respect to the area of the adhesive layer 3 whole into the above-mentioned range, the adhesive force when pasted for the first time and the adhesive force when pasted for the second time , And as a result, the heating tool 1 can be attached to the garment with sufficient adhesive force in both the first and second bonding, and the heating tool 1 is peeled off from the garment. It is also possible to prevent clothing from being damaged due to excessive adhesive strength.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above embodiment, the two non-adhesive portions 33 are formed in the adhesive layer 3, but this can be eliminated.

  Further, in the above embodiment, the end sheets 41a and 41b are independent from each other and are configured to be peeled separately. For example, as illustrated in FIG. It can also be set as the structure which can connect at least one of the front-end | tip parts and rear-end parts of 41b, and can peel off the edge part sheet | seats 41a and 41b at once. In this case, as shown in FIG. 5, the central sheet portion 42 may be shaped to have a plurality of protrusions 421 that extend toward the outer peripheral edge of the adhesive layer 3. As described above, by having the plurality of protrusions 421, when the central sheet portion 42 is peeled off in order to perform the second attachment, the outer peripheral edge of the adhesive layer 3 covered by each protrusion 421. Is newly exposed. Thereby, it can paste | paste using the outer peripheral edge part of the adhesion layer 3 newly exposed also in the case of the 2nd sticking, and can also make the 2nd sticking more stable.

  Moreover, in the said embodiment, although the adhesion layer 3 and the peeling sheet 4 which covers this are formed in planar view rectangular shape, as shown in FIG. 6, it is set as various shapes, such as making it elliptical shape. Can do. Similarly, the bag body 2 can have various shapes other than the rectangular shape in plan view, such as an elliptical shape in plan view.

  Further, in order to clearly indicate the order in which the end sheet portions 41a and 41b and the central sheet portion 42 are peeled in the release sheet 4, for example, the release sheet 4 is peeled to at least one of the adhesive layer 3 and the bag body 2. A mark such as a symbol or a character indicating the order to be performed can be attached. When marking the pressure-sensitive adhesive layer 3 or the bag 2, the pressure-sensitive adhesive layer 3 or the release sheet 4 is transparent or semi-transparent so that the mark can be seen with the release sheet 4 attached to the pressure-sensitive adhesive layer 3.

  Moreover, in the said embodiment, although the adhesion layer 3 is formed in the whole outer surface of the 2nd sheet | seat 22, it is not limited to this in particular, For example, it forms adhesion in part, such as forming the adhesion layer 3 in the shape of a dot. The layer 3 may not be formed.

  Moreover, in the said embodiment, although each edge part 31a, 31b of the adhesion layer 3 is covered by the separated two edge part sheet parts 41a, 41b, it can also be covered by one edge sheet part. . In this case, first, the central portion 32 of the adhesive layer 3 is covered with the central sheet portion 42, and then the adhesive layer 3 including the end portions 31 a and 31 b of the adhesive layer 3 with the end sheet portion having the same dimensions as the adhesive layer 3 from above. Covers the whole.

  The present invention will be described more specifically with reference to the following examples and comparative examples. In addition, this invention is not limited to the following Example.

  First, the adhesive layer 3 is formed on the upper surface of the second sheet 22, and a plurality of the adhesive layers 3 covered with the release sheet 4 are prepared as test pieces, and the first and second adhesions are applied. The force difference was evaluated. In addition, as shown in Table 1, the widths of the end portions 31a and 31b and the central portion 32 (distance in the vertical direction in FIG. 3) of the adhesive layer 3 are variously changed.

  The production method of the test piece will be described. First, a polyethylene film having a length of 130 mm and a width of 95 mm is prepared as the second sheet 22, and the SIS is formed so that the entire upper surface of the second sheet 22 has a thickness of 65 μm. An adhesive layer 3 was formed by applying a (styrene-isoprene-styrene) adhesive. Two non-adhesive portions 33 having a width of 7.5 mm extending in the longitudinal direction of the second sheet 22 are formed. The non-adhesive portions 33 are portions where the adhesive layer 3 is not formed. By the non-adhesive portion 33, the adhesive layer 3 is divided into end portions 31 a and 31 b and a central portion 32. And as the peeling sheet 4 for covering this adhesion layer 3, the paper and polyethylene which have the same dimension as the 2nd sheet 22 are laminated, and the thing which carried out silicon processing to the polyethylene layer side whole surface was used, and this silicon processing was carried out. The polyethylene side surface was attached to the adhesive layer 3. The release sheet 4 is separated into end sheet portions 41 a and 41 b and a central sheet portion 42, and the end sheet portions 41 a and 41 b and the central sheet portion 42 of the release sheet 4 are separated from the adhesive layer 3. The dimensions correspond to the end portions 31 a and 31 b and the central portion 32.

  The test piece thus produced was used, and the adhesive strength of the first and second sticking was measured as follows. First, the end sheet portions 41a and 41b of the release sheet 4 are peeled to expose the end portions 31a and 31b of the adhesive layer 3, and this is overlaid on the JIS standard cotton cloth No. 3 (manufactured by Japan Standards Association). Then, a roller having a load of 2 kg is reciprocated at a speed of 300 mm / min from above, and is fixed by pressure bonding. The test piece is attached using the Shimadzu small desktop testing machine EZTest (manufactured by Shimadzu Corporation). The adhesive strength when peeled in the direction of 180 degrees at a speed of 300 mm / min was measured. The results of the adhesive strength obtained at this time are shown in Table 1 as “Adhesive strength first time”. Subsequently, the test piece is peeled off from JIS standard cotton cloth No. 3 (manufactured by the Japanese Standards Association), and the central sheet portion 42 of the release sheet 4 is peeled to expose the central portion 32 of the adhesive layer 3, that is, the adhesive layer 3 The surface was exposed and attached to a new JIS standard cotton cloth No. 3 (manufactured by the Japanese Standards Association), and the adhesive strength was measured in the same manner as described above. The result of the adhesive strength obtained at this time is shown in Table 1 as “Adhesive strength second time”. In addition, the area ratio in Table 1 means the ratio of the total area of the end portions 31a and 31b to the entire area of the adhesive layer 3. The area of the entire adhesive layer 3 is the sum of the areas of the end portions 31 a and 31 b and the central portion 32 of the adhesive layer 3, and does not include the area of the non-adhesive portion 33.

  From Table 1, it was found that when the area ratio was 62.5 to 87.5%, the difference in adhesive strength was within 10N.

DESCRIPTION OF SYMBOLS 1 Heating tool 2 Bag body 3 Adhesive layer 31a, 31b End part 32 Center part 4 Release sheet 41 End part sheet part 42 Center sheet part A Heat generating composition

Claims (8)

It is a heating tool that can be pasted once on clothing,
A heat generating composition containing an oxidizable metal capable of generating heat by contact with air is stored, and a bag body having air permeability on one surface;
An adhesive layer formed on the other side of the bag,
A release sheet attached on the adhesive layer so as to cover the adhesive layer,
The release sheet has an end sheet portion that covers each opposing end portion of the adhesive layer, and a central sheet portion that covers a central portion sandwiched between each end portion of the adhesive layer, and the end sheet The heater and the central sheet portion are separable and can be separated.   The heating tool according to claim 1, wherein a ratio of a total area of each end portion to an area of the entire adhesive layer is 62.5 to 87.5%.   The heating tool according to claim 1 or 2, wherein the total adhesive strength of each end portion of the adhesive layer and the adhesive strength of the central portion of the adhesive layer are 10 to 30 N, respectively.   The heating tool according to any one of claims 1 to 3, wherein the adhesive layer is formed of a rubber-based adhesive.   The heating tool according to any one of claims 1 to 4, wherein a boundary between an end sheet portion and a central sheet portion of the release sheet is a waveform.   The heating tool according to any one of claims 1 to 5, wherein the adhesive layer has a non-adhesive portion formed at a boundary portion between each end portion and the central portion.   The heating tool according to any one of claims 1 to 6, wherein an end sheet portion and a center sheet portion of the release sheet extend along a longitudinal direction of the bag body. A method of using the heating tool according to any one of claims 1 to 7,
A first step of peeling off the end sheet to expose each end of the adhesive layer and attaching it to clothing;
After the first step, the heating tool is peeled off from the clothing, the central sheet portion is peeled off, and the heating tool is attached to the clothing using the central portion and the end portions of the adhesive layer; and How to use the heating tool.

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