JP2021115479A - Adhesive heating implement - Google Patents

Abstract

To provide a heating implement which is capable of efficient exothermic reaction and leaves little metals to be oxidized that has not reacted when heat generation is over; a heating implement which causes little variation in how to feel heat regardless of the kind of clothes; and a heating implement which can simply and economically be manufactured in a conventional production facility and has little individual difference.SOLUTION: In a bag body for housing a heat-generating composition which generates heat under presence of the air and has a surface applied to an object and the other surfaces, the bag body satisfies the following: (1) the surface applied to the object is composed of an air-permeable film or sheet and the other surfaces are composed of non-air-permeable films or sheets or of packaging materials including the non-air-permeable films or sheets; and (2) adhesive means is provided on the air-permeable film or sheet on the surface applied to the object and an area closed by the adhesive means or other occlusion agents has 65% or less closed area ratio and 85% or more peripheral edge part closed area.SELECTED DRAWING: None

Description

The present invention relates to a bag for accommodating a heat-generating composition that generates heat by reacting with air (oxygen), and a heating device that is used by being attached to a body, clothing, or the like, including the bag.

A heating device including a breathable bag containing a heat-generating composition that generates heat in contact with air (oxygen) is generally widely used as a medical device for reducing pain due to heat and a body warmer for cold protection. .. As such a heating tool, a so-called "sticking type" disposable body warmer, a medical heating material, or the like, which is used by being attached to the body or clothing, is well known. The bag body of such a heating device needs to have at least a part of its surface breathable. For example, when the bag body is flat, one side is made of a breathable sheet or both sides are made of a breathable sheet.

Such heating devices are generally used with one side facing the body and the other side facing the outside. When the heating device is used in close contact with the body or other object, the surface on the body side does not substantially contribute to heat generation because air can enter only through a small gap from the body or the object side. It is believed that. Therefore, the bag body of the heating tool is generally composed of a breathable sheet on the outside air side and an adhesive layer on the non-breathable sheet on the body side. The most widely adopted configuration is that the packaging material on the front side (opposite side of the body) is a non-woven fabric / adhesive / breathable film from the outside toward the inside of the bag body (heating composition side), and the back side (the back side (opposite side of the body). The packaging material on the body side) is a non-breathable film / adhesive / release paper from the inside (heat generating composition side) to the outside of the bag body.

Such a heating tool contains a heat-generating composition containing a metal to be oxidized such as iron powder, activated carbon, salts, water and the like in the bag body. In a heating tool having a general configuration as described above, the water pre-blended in the heat-generating composition is released from the bag body during use due to heat generation and decreases, so that the heat-generating tool filled in the bag body is oxidized. The metal does not sufficiently oxidize, and at the end of heat generation, unreacted metal to be oxidized remains.

Further, since the heating tool having such a configuration controls the exothermic reaction by the amount of air (oxygen) flowing in from the outside, the exothermic temperature is considered to be proportional to the air permeability of the breathable sheet constituting the breathable surface. .. Therefore, in a heating device designed on the assumption that air is taken in from the side opposite to the body, the temperature may be lower than the design by wearing thick clothing having poor breathability on the breathable surface. Further, when such a heating device is attached to clothing and used, air does not flow in from the body side, so that the heat generation temperature does not change even if the body and the heating device are separated from each other. Therefore, the temperature felt by the user changes depending on the degree of adhesion between the clothes and the body, and if the heating device is separated from the body even a little, the appropriate temperature may not be felt.

Patent No. 3049707 (Patent Document 1), a steam generator utilizing the exothermic reaction of the metal powder, of a high permeable sheet such as a surface to be applied to the skin or mucosa 4000g / m ² · 24h or more Therefore, a non-breathable sheet is provided on the surface on the outside air side. However, this water vapor generator has a structure for actively releasing water vapor from the bag body to the skin side simply to apply a large amount of water vapor to the skin or the like, and the reaction efficiency or temperature stability of the exothermic composition. We are not paying attention to such things. Further, Japanese Patent Application Laid-Open No. 3-96816 (Patent Document 2) describes a heat-generating bag in which a ventilation surface is attached to a heat-retaining object and is used, and the surface on the outside air side is a non-ventilation surface. Has been done. The purpose of this heat generating bag is to reduce the variation in heat generation performance due to the variation in the air permeability of the breathable film and to extend the heat generation time by limiting the ventilation area with an adhesive. However, how to provide the pressure-sensitive adhesive layer has not been examined in detail.

Japanese Patent No. 3049707 Jitsuzenpei No. 3-96816

According to the present invention, a heating tool capable of efficiently performing an exothermic reaction and preventing unreacted metal oxides from remaining at the end of exothermic reaction, in other words, a heating composition similar to the conventional one is used. Even if there is, it is an object of the present invention to provide a heating tool having a longer duration of heat generation at a high temperature and a larger amount of heat generation than before. Another object of the present invention is to provide a heating tool in which the feeling of heat does not fluctuate between when it is directly attached to a body or attached to clothing which is in close contact with the body and when it is attached to loose clothing. ..
Another object of the present invention is to provide a heating tool that can be easily and economically manufactured using the same production equipment as the conventional one, has small individual differences, and can exhibit uniform heat generation performance. do.

According to the present invention
[1] In a bag for accommodating a heat-generating composition that generates heat in the presence of air, the bag has a surface applied to an object to which heat is applied and another surface.
(1) The surface applied to the object is made of a breathable film or sheet, and the other surface is made of a non-breathable film or sheet, or is made of a packaging material containing a non-breathable film or sheet. And (2) a sticking means is provided on the breathable film or sheet of the surface applied to the object, and the area blocked by the sticking means or another obstructing agent is the surface applied to the object. Regarding the effective bag area
Blocked area ratio (%) = (closed area / effective bag area) x 100
(Here, the effective bag body area means the area of the effective bag body portion that can accommodate the heat generating composition on the surface applied to the object. The closed area is the pasting of the effective bag body area. The closed area ratio calculated by means (meaning the area where the holes are closed by means or other blocking agent and becomes non-breathable) is 65% or less, and the closed area ratio is 65% or less.
Peripheral blockage area ratio (%) = [peripheral blockage area / (peripheral blockage area + non-peripheral blockage area)] × 100
(Here, the peripheral portion is 30% of the longest straight line distance between two points on the circumference (those facing parallel to the side or the tangent line) from the circumference of the effective bag body portion toward the center of the bag body. The peripheral portion closed area means the area of the effective bag body portion formed on the peripheral portion and becomes non-breathable. The non-peripheral portion closed area is the total closed area. , The area that is not the peripheral closed area.)
The bag body is characterized in that the peripheral edge closed area ratio calculated by the above is 85% or more, and (3) a release material is laminated on the sticking means.
[2] breathable film or sheet constituting the surface to be applied to the subject, air permeability 100～40,000 (sec / 100 cc) and moisture permeability ^{150~5,000 (g / m 2 · 24h} )
The bag body according to the above [1], which is a breathable film or sheet of.
[3] breathable film or sheet constituting the surface to be applied to the subject, air permeability 5,000 to 30,000 (sec / 100 cc) and moisture permeability ^{200~4,000 (g / m 2 · 24h} ) The bag body according to the above [2], which is a breathable film or sheet of.
[4] A heating tool comprising the bag according to any one of the above [1] to [3] and a heat generating composition that generates heat in the presence of air contained in the bag;
[5] The heating tool according to [4] above, wherein the maximum heat generation temperature is 45 ° C. or higher.
[6] The heating device according to the above [4] or [5], which is housed in an airtight outer bag, is provided.

According to the present invention, there is provided a heating tool having a large calorific value and a small amount of unreacted metal oxide remaining at the end of heat generation even if the same heat generating composition as the conventional one is used. Further, according to the present invention, since the inflow of air occurs only from the surface applied to the object, if this surface is not in close contact with the object, more air may flow in and the heat generation temperature may rise moderately. .. Therefore, a heating device is provided in which the temperature felt by the body is stable regardless of whether the body is in close contact with the body or away from the body, and the heat generation can be felt more stably and longer than before.

Further, according to the present invention, there is provided a heating tool that can be easily and economically manufactured by using the same production equipment as the conventional one, has a small individual difference, and can exhibit uniform heat generation performance. That is, the heating tool of the present invention can be easily manufactured by the same manufacturing equipment as the conventional one in basically the same process as the conventional one, which is advantageous in terms of production technology, quality control and economic efficiency.

Further, according to the present invention, at least the body side packaging material does not require the non-woven fabric layer generally used in the past, and the lamination processing with the film is not required. Down can be achieved.

FIG. 1 is a cross-sectional view of an example of the heating tool of the present invention. (A) is an example in which both the front surface side and the back surface side of the bag body are composed of a single film or sheet, and (B) is an example in which the front surface side is composed of a sheet having a covering material. .. FIG. 2 is a diagram illustrating various patterns of the pressure-sensitive adhesive layer of the heating tool. In each pattern, the shaded portion represents the portion where the pressure-sensitive adhesive layer exists, and the white portion represents the portion where the pressure-sensitive adhesive layer is not formed. The dotted line represents the boundary between the heat-sealed portion and the effective bag body portion, and the inside surrounded by the dotted line is the effective bag body portion capable of accommodating the heat-generating composition, and the outside is the heat-sealed portion. FIG. 3 is a diagram illustrating a peripheral edge closed area. Of the pressure-sensitive adhesive layers applied in each of the patterns of FIGS. 2 (A) to 2 (G), the portion to be included as the peripheral portion closed area is shaded. FIG. 4 is a diagram showing heat generation profiles (both samples of n1 and n2) of the heating tools of the present invention (Examples 1 and 2) and the heating devices of Comparative Examples (Comparative Examples 1 and 2). All of these are heating tools having the pressure-sensitive adhesive layer of the pattern shown in FIG. 2 (A). FIG. 5 is a diagram showing heat generation profiles (both samples of n1 and n2) of the heating device of the present invention (Example 3) and the heating device of Comparative Example (Comparative Examples 3 and 4). Example 3 is a heating tool having the pattern of the adhesive layer of FIG. 2 (B), Comparative Example 3 of FIG. 2 (D), and Comparative Example 4 of FIG. 2 (E). FIG. 6 is a diagram showing heat generation profiles (both samples of n1 and n2) of the heating device of the present invention (Example 4) and the heating device of Comparative Example (Comparative Example 5). Example 4 is a heating tool having the pattern of the adhesive layer of FIG. 2 (C) and Comparative Example 5 of FIG. 2 (F). FIG. 7 is a diagram showing a heat generation profile (samples of n1 and n2) of a reference example (commercially available product). FIG. 8 is a diagram showing a heat generation profile (each sample of n1 to n5) of the heating device of the present invention (Examples 1, 2, and 3). (A) represents the result of Example 1, (B) represents the result of Example 2, and (C) represents the result of Example 3. Examples 1 and 2 are heating tools having the pattern of FIG. 2 (A), and Example 3 is a heating tool having an adhesive layer of the pattern of FIG. 2 (B). FIG. 9 is a diagram showing a heat generation profile (each sample of n1 to n5) of the heating device of the present invention (Examples 4 to 7). (A) represents the results of Example 4, (B) represents the results of Example 5, (C) represents the results of Example 6, and (D) represents the results of Example 7. Example 4 is a heating tool having the pattern of FIG. 2 (C), Example 5 is the pattern of FIG. 2 (D), and Examples 6 and 7 are the heating tools having the adhesive layer of the pattern of FIG. 2 (A). FIG. 10 is a diagram showing a heat generation profile (each sample of n1 to n5) of the heating device of the present invention (Examples 8, 9, and 10). (A) represents the result of Example 8, (B) represents the result of Example 9, and (C) represents the result of Example 10. All of these are heating tools having the pressure-sensitive adhesive layer (different coating thickness) of the pattern shown in FIG. 2 (A). FIG. 11 is a diagram showing a heat generation profile (each sample of n1 to n5) of a heating tool of Comparative Example (Comparative Examples 1, 2, and 3). (A) represents the results of Comparative Example 1, (B) represents the results of Comparative Example 2, and (C) represents the results of Comparative Example 3. Comparative Examples 1 and 2 are heating tools having the pattern of FIG. 2 (A), and Comparative Example 3 is a heating tool having an adhesive layer of the pattern of FIG. 2 (D). FIG. 12 is a diagram showing a heat generation profile (each sample of n1 to n5) of a heating tool of Comparative Example (Comparative Examples 4 to 7). (A) represents the results of Comparative Example 4, (B) represents the results of Comparative Example 5, (C) represents the results of Comparative Example 6, and (D) represents the results of Comparative Example 7. Comparative Example 4 is FIG. 2 (E), Comparative Example 5 is FIG. 2 (F), Comparative Example 6 is FIG. 2 (D), and Comparative Example 7 is a heating tool having an adhesive layer having the pattern of FIG. 2 (A). Is. FIG. 13 is a diagram showing the heat generation profiles of the heating tools of Comparative Examples (Comparative Examples 8 and 9) and the heating devices of Reference Examples (both samples of n1 to n5). (A) represents the results of Comparative Example 8, (B) represents the results of Comparative Example 9, and (C) represents the results of Reference Example 1. Comparative Examples 8 and 9 are heating tools having the pressure-sensitive adhesive layer (coated on the non-woven fabric) having the pattern shown in FIG. 2 (A). FIG. 14 is a diagram showing the temperature of the heating tool and the temperature of the skin when the heating tool of the present invention is attached to three different types of clothing and used. The heating device of Example 1 was used for (A), and the heating tool of Example 5 was used for (B). FIG. 15 is a diagram showing the temperature of the heating tool and the temperature of the skin when the heating tools of the comparative example and the reference example are attached to three different types of clothing and used. Comparative Example 3 was used for (A), Comparative Example 4 was used for (B), and Reference Example 1 was used for (C).

The bag body of the present invention has a surface applied to a body, clothing, or another object to which heat should be applied (hereinafter, also referred to as a “back surface” or “attachment surface” for convenience) and at least one other surface (hereinafter, also referred to as a “sticking surface”). Hereinafter, for convenience, it also has a "front surface"). Preferably, the bag body is a gussetless (flat) bag body including two surfaces, a surface applied to the body and the like and a surface located on the opposite side (outside air side).
For the sake of simplicity, in the present specification, the body, clothing, and other objects to which heat is applied by the heating tool of the present invention may be referred to as "body" or "body, etc.", but the present invention The target to which the heating device is applied is not limited to the body.

The back surface of the packaging material bag on the body side, that is, the back surface is made of a breathable film or sheet. In a general disposable body warmer, a composite sheet having a resin film layer and a covering material (nonwoven fabric) layer is used. The non-woven fabric layer is provided for the purpose of improving the feel, reinforcing the film, improving the ease of air entry, and the like. In the bag body of the present invention, the packaging material constituting the body side surface is a breathable film or sheet. It consists of and does not have a non-woven fabric layer. Therefore, as the back surface of the bag body of the present invention, a breathable resin film or a single sheet having a thickness of preferably about 10 to 200 μm, more preferably about 20 to 150 μm is used. By using the breathable film or the sheet alone as the packaging material for the back surface, the water vapor released from the heat-generating composition does not leak horizontally from the voids of the non-woven fabric layer to the surface such as the body, and the breathable film. Alternatively, since it stays between the sheet and the body or the like, the release of water vapor from the breathable film or sheet is suppressed. Further, as a result, since moist heat is applied to the body, it is possible to provide a body warmer in which the heat reaches a deep part and moisturizes dry skin and the like.

In the present specification, the "film" and the "sheet" are referred to as a film if they are relatively thin and a sheet if they are relatively thick (about 200 μm or more), but they are not strictly distinguished. The film and the sheet may be single-layered or multi-layered, and may be produced by any conventional method. Further, in the present specification, the "single unit" is a single-layer or multi-layer film or sheet, and is a composite with another material (fiber sheet, for example, non-woven fabric or woven fabric, or paper, board, etc.). Refers to something that does not exist.

As the breathable film or sheet, a substantially non-breathable film or sheet may be made breathable by perforating a substantially non-breathable film or sheet by a known method such as a needle or a laser, but in general, it is simply used. A layered or multi-layered porous film or the like is used. The breathable film or sheet can include any layer, if desired, and for example, a film or sheet having a temperature control agent layer described in WO2016 / 063815 may be used. Examples of the resin constituting the porous film include polyethylene, polypropylene, polyethylene fluoride and the like. Of these, polyethylene (PE) is preferable, and linear low-density polyethylene (LLDPE) is more preferable from the viewpoint of workability and the like. These resins can be used alone or in combination.

As the breathable film used in the present invention, a stretched porous film is preferable. The stretched porous film generally contains an inorganic filler such as calcium carbonate, and breathability is exhibited by forming communication holes by stretching. By controlling the pore diameter and / or the number of pores, a porous film having desired air permeability is produced. The stretched porous film used in the present invention may be either uniaxially stretched or biaxially stretched.

Since the heat generation characteristics of the heating tool (heat generation rising speed, heat generation duration, heat transfer property to a heating object such as a human body or clothing, etc.) change depending on the selection of the breathable film, they are desired according to the purpose of use. Known ones can be appropriately selected and used so as to fall within the range.

As a breathable packaging material for a bag containing a heat-generating composition, a breathable packaging material of 10,000 to 60,000 seconds / 100 cc (JIS P8117) has been conventionally used for a general body warmer or the like for a human body. In shoe body warmers used in an environment where the inflow of air is restricted, a breathable packaging material of 2,000 to 7,000 seconds / 100 cc is used. On the other hand, in the present invention in which the breathable film is arranged on the body side, a breathable film of 100 to 40,000 seconds / 100 cc can be used for a heating device used as a body warmer for the human body. When the heating tool of the present invention is a body warmer for the human body, the breathability of the breathable film used in the bag is preferably 5,000 to 30,000 seconds / 100 cc, preferably 6,000 to 25,000 seconds /. 100 cc is more preferable. The lower the air permeability of the porous film, the more difficult it is to control the variation in the air flow rate. Therefore, the present invention in which a highly breathable film can be used is economical, productive and economical. It can be said that it is also advantageous.

If warming device of the present invention is a circuit for the human body, the moisture permeability (JIS K7129A) is breathable film used in bag, 150~5,000g / m ² · 24h are preferred, 200～4,000G / m is more preferably ^{2 · 24h, 200~3,800g / m 2} · 24h is most preferred. If the moisture permeability is too high, too much water vapor is released, the heat generation time is shortened, and unreacted metal oxide tends to remain.

Sticking means (adhesive layer)
The sticking means in the present invention may be any as long as it can be kept stuck on the heating target while the heating tool is being used and can be removed without damaging the heating target after use. .. In the present invention, an adhesive layer is provided as a sticking means on the breathable film or sheet on the back surface. As the pressure-sensitive adhesive, any known pressure-sensitive adhesive can be used. For example, acrylic adhesives, rubber adhesives, urethane adhesives (acrylic urethane adhesives), silicone adhesives, ethylene-vinyl acetate copolymer adhesives, polyester adhesives, polyamide adhesives, epoxys. Examples include system adhesives. Examples of the type include a type diluted with an organic solvent and water, and a hot melt type. The compress layer such as gel is also a sticking means and a pressure-sensitive adhesive layer in the present invention as long as it has sufficient adhesiveness to stick the heating tool to the target. Further, the sticking means (adhesive layer) may contain various known components such as a fragrance, a warming component, and a medicinal component. From the viewpoint that oxygen can easily flow in stably, an adhesive layer suitable for being attached to clothing or the like rather than being directly attached to the body or the like is preferable.

In the present invention, the pressure-sensitive adhesive layer is provided on a breathable film or sheet without a covering material such as a non-woven fabric. Since the breathable film or sheet is inferior in strength to the non-woven fabric, it is self-adhesive in terms of reducing the risk of bag breakage that occurs when the user tries to peel off the adhesive surfaces that have come into contact with each other by mistake when using the heating device. A low-grade acrylic pressure-sensitive adhesive is preferable.

Examples of the method for applying the adhesive include known methods using a comma coater, a gravure coater, a hot melt T die coater, and the like. The thickness of the applied pressure-sensitive adhesive layer can be generally 5 to 250 μm, preferably 5 to 200 μm or 10 to 220 μm, and more preferably about 20 to 200 μm.

In the present invention, it has been found that the position and the ratio of the area where the pressure-sensitive adhesive layer is formed are important. The adhesive layer may also be formed on the adhesive (heat seal) portion of the bag body, but since the adhesive (heat seal) portion is not involved in either the inflow of air or the release of water vapor, it will be described below. In addition, the area of this portion is not included in the position and area of the pressure-sensitive adhesive layer in the present invention. In addition, in this specification, "adhesion" means sticking which is not scheduled to be opened, peeled or detached before or during use.

First, in the present invention, the effective area of the bag body containing the heat generating composition (that is, the back surface side after the front surface packaging material and the back surface packaging material are adhered to each other by heat sealing or the like to form a bag body). The area of the effective bag body portion of the breathable film or sheet that can accommodate the heat-generating composition and does not include the area of the non-breathable portion due to adhesion; hereinafter referred to as "effective bag body area"). The ratio (or ratio, or ratio) to the area (hereinafter referred to as "closed area") in which the holes are closed due to the formation of the pressure-sensitive adhesive layer or the like and becomes non-breathable is important.

That is,
formula:
Blocked area ratio (%) = (closed area / effective bag area) x 100
When calculating the ratio of the area that has become non-breathable due to the adhesive layer, etc., to the effective bag body area, the closed area ratio is 100 when the adhesive layer, etc. is formed on the entire surface of the effective bag body portion. %, And the smaller the area where the pressure-sensitive adhesive layer or the like is formed, the lower the closed area ratio.

In the present invention, the closed area ratio is preferably 60% or less, more preferably 55% or less. When the closed area ratio exceeds 65%, the calorific value becomes very low, and there is a high possibility that a large amount of exothermic composition that terminates exotherm without reaction remains, or the exothermic temperature tends to vary. The present invention is not bound by any particular theory, probably due to insufficient or unstable air supply to the exothermic composition.

Secondly, in the present invention, the position blocked by the pressure-sensitive adhesive layer or the like is also important. Specifically, it is also important that the closed portion is formed in a portion along the circumference (that is, a peripheral portion) of the effective bag body portion at a high ratio.

That is,
formula:
Peripheral blockage area ratio (%) = [peripheral blockage area / (peripheral blockage area + non-peripheral blockage area)] × 100
(Here, the peripheral portion closed area means an area of the effective bag body portion formed along the circumference of the bag body (that is, the peripheral edge portion) and becomes non-breathable. The peripheral edge portion means. Specifically, the longest straight line distance between two points on the circumference (those facing parallel to the side or tangent line) from the circumference of the effective bag body (indicated by the dotted line in FIG. 2) toward the center of the bag body. (Not the diagonal length or the distance between any two points that are not parallel to the side, for example, the length of the long side if the bag is rectangular, the major axis if it is oval, the diameter if it is circular) The non-peripheral closed area means the area of the total closed area that is not the peripheral closed area.)
When calculating the ratio (or ratio, or ratio) of the area formed on the peripheral edge of the bag to the closed area, when all of the closed area by the adhesive layer or the like is formed on the peripheral edge. It is 100%, and the larger the area formed other than the peripheral edge portion, the lower the peripheral edge closed area ratio.

In the present invention, the peripheral edge closed area ratio is preferably 90% or more, and more preferably 95% or more. When the peripheral area closed area ratio is less than 85%, the calorific value becomes very low, and there is a high possibility that a large amount of exothermic composition that terminates exotherm without reaction remains. The present invention is not bound by any particular theory, probably because it is related to the suppression of the release of water vapor from the exothermic composition.

Therefore, an adhesive or the like that closes the pores of the breathable film or sheet (blocking agent) can be applied to any position and shape such as stripes and circles, but at least one of the above conditions is preferable. Need to select the coating pattern to satisfy both. For example, the adhesive may be applied only to the long side (vertical) or short side (horizontal) of the rectangular effective bag portion, or the adhesive may be applied to the entire circumference of the rectangular, circular or elliptical effective bag portion. A coating pattern is desirable. By taking the aspect shown in FIG. 2 as an example, it is possible to contemplate a heating device of the present invention in a wide variety of aspects. The blocking agent is not limited to the pressure-sensitive adhesive, and may be, for example, a paint, an ink, or a resin.

Release Paper In the present invention, as the release paper, any release paper (not limited to paper, but may be a film or the like) usually used for covering the surface of the pressure-sensitive adhesive layer can be used. .. The adhesive packaging material for heating equipment such as Cairo can be manufactured by applying the adhesive directly to the packaging material, but in the case of industrial production, the adhesive is generally applied to the release paper. Later, the pressure-sensitive adhesive is transferred to the film or sheet to form a pressure-sensitive adhesive layer on the film or sheet. In the present invention, since the release paper is laminated on the breathable film of the backside packaging material or the pressure-sensitive adhesive layer provided on the sheet, the conventional breathable packaging material having a non-woven fabric as a covering material is used as the backside packaging material. By heat-sealing with a rotating roll, edge breakage during bag making is less likely to occur as compared with the case of using as a non-woven fabric. In addition, since the packaging material becomes thin due to the absence of the non-woven fabric, sheet sealing at low temperature and high speed becomes possible.

The release paper may have slits or perforations to facilitate the release by hand during use. In this case, it is desirable not to provide an adhesive layer directly under the slit or perforation portion so that the adhesive does not adhere to the blade when processing the slit or perforation.

Alternatively, it is desirable not to apply the adhesive to the position corresponding to the heat-sealed portion on the outer periphery of the peripheral edge of the bag. By doing so, a gap is formed between the release paper and the back surface packaging material without making slits or perforations, so that the release paper can be peeled off from the end portion of the heating tool.

Surface packaging material The surface of the bag body other than the body side, that is, the surface, is made of a non-breathable film or sheet. As a result, the moisture (water or steam) in the heat-generating composition stays on the non-breathable film or the inner surface of the sheet side, and is less likely to be released from the heat-generating composition. It is believed that it can be provided.

With respect to the present invention, (substantially) non-breathable means, in addition to completely non-breathable, some breathable due to manufacturing-generated pinholes, non-breathable packaging in a thermal body. The purpose is to include materials that are breathable to the extent that they do not interfere with their use as materials. In other words, if it is not intentionally made porous or perforated in the manufacturing process and its breathability does not hinder its use as a non-breathable packaging material in a thermal body, ( It is (substantially) non-breathable.

The resin constituting the non-breathable film may be any commonly used resin, for example, polyethylene, polypropylene, polyester, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, ethylene-acetic acid. Examples thereof include a vinyl copolymer, polycarbonate, rubber hydrochloride and the like alone or in combination.

When forming the bag body, the packaging material on the front surface side and the breathable sheet or film on the back surface side are adhered to each other, which is generally performed by heat sealing at present. Therefore, in order to manufacture the bag body using the current heating material manufacturing equipment as it is, the side surface (the surface to be adhered to the back surface side film or sheet) that is inside the bag body and is in contact with the heat generating composition is It is preferably made of a heat-sealable resin. The heat-sealable resin layer may be provided only on the peripheral portion to be heat-sealed. Such heat-sealable resins are known, and particularly preferable ones include olefin resins, especially polyethylene. In particular, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear low density polyethylene produced using a single site catalyst (mLLDPE), or those containing the same are most preferable.

The thickness of the non-breathable film or sheet used for the surface side packaging material is not particularly limited, but is generally about 5 to 20 μm, preferably about 20 to 100 μm.

The surface packaging material may be a composite with a covering material such as a non-woven fabric. The material of the non-woven fabric can include artificial fibers such as polyamide, rayon, polyester, vinylon, acrylic, polyethylene and polypropylene, and natural fibers such as cotton, linen and silk. Examples of the method for producing the non-woven fabric include spunbond and thermal bond spunlace.

The basis weight of the non-woven fabric varies depending on the material of the non-woven fabric, the specific gravity and the bulkiness due to the difference in the entanglement method, but generally about 10 g / m ² to about 200 g / m ² is suitable, and particularly 10 to 100 g / m. ^{About 2} is preferable, and about 10 to 50 g / m ² is most preferable.

In addition, if desired, as a non-breathable packaging material on the surface side, artificial fibers such as paper, aluminum sheet, polyurethane foam, polyvinyl chloride, cloth such as cotton, linen, and silk, or laminated products thereof may be used. can.

Heat-generating composition In the heating tool of the present invention, the heat-generating composition is not particularly limited as long as it can generate heat in the presence of air (oxygen), and any conventionally known heat-generating composition can be used. The exothermic composition generally contains a main agent composed of a metal powder to be oxidized such as iron powder, salts, water, a water retention agent (activated carbon) and the like.

Iron powder is generally used as the metal powder to be oxidized, but other powders may be used as long as they generate heat of oxidation. As the salts, inorganic salts such as sodium chloride, potassium chloride and magnesium chloride are generally used. Activated carbon is generally used as the water-retaining agent, but a water-retaining agent other than activated carbon (for example, a water-absorbent polymer, vermiculite, sawdust, silica-based substance, etc.) may be contained. In addition, various other conventionally known components can be added as needed. For example, the temperature control agent described in International Publication WO2016 / 063815 may be added to the exothermic composition.

Specific examples of the composition of the exothermic composition include iron powder, reduced iron, activated charcoal, alumina, silica gel, charcoal, water-absorbent polymer, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, iron chloride, acetic acid, and chloroacetic acid. , Water, acrylic water-absorbing polymer, CMC, bentonite, tolumarin (magnesium chloride), sodium tripolyphosphate, calcium chloride, vermiculite, wood flour, polyethylene, polypropylene, polystyrene, etc. Suitable for use.

Examples of blending of these components include iron 35 to 80% by weight, activated carbon 1 to 20% by weight, salts 0.5 to 10% by weight, and water 5 to 45% by weight, assuming that the weight of the exothermic composition is 100%. , A water retention agent other than activated carbon consisting of 0 to 45% by weight.

The exothermic composition can be produced by mixing the above-mentioned essential components and any component selected as necessary under low oxygen or anoxic conditions by a known method. The heat-generating composition may be in any form as long as it is contained in a breathable bag, may be a powder, or may be further processed by a known method. For example, it may be formed in a sheet shape by rolling, a cube shape by locking, or the like. Further, it may be used in a desired form such as clay-like, viscous body-like, ink-like, cream-like, slurry-like or liquid.

Heating tool The heating device of the present invention is basically composed of a bag for containing a heat-generating composition composed of the back surface packaging material and the front surface packaging material as described above, and a heat generating composition contained therein. NS. The heating device of the present invention may include any additional elements in addition to the above configurations.

The heating device of the present invention can be produced by any known method. When the heating tool of the present invention is a body warmer for the human body, the maximum heat generation temperature is generally 40 ° C. to 70 ° C., preferably 45 ° C. to 70 ° C., and more preferably 45 ° C. to 65 ° C. When the heating tool of the present invention is a body warmer for the human body, the duration of heat generation (time from reaching 40 ° C. to falling below 40 ° C.) is preferably 8 hours or more, more preferably 12 hours or more. Most preferably, it is 14 hours or more.

The outer bag heater is sealed in a substantially impermeable (airtight) outer bag and stored until use. Such an outer bag is also known, and any one can be adopted.

1. 1. Manufacture of disposable body warmers <Materials and manufacturing procedures>
In all Examples and Comparative Examples, the following materials were used and disposable body warmers were produced by the same procedure.

As a packaging material for the surface (opposite side of the body), a non-breathable film prepared by laminating a polyester film 12 μm thick manufactured by Unitika Ltd. and a polyethylene film 40 μm thick manufactured by Sun A. Kaken Co., Ltd. by a dry laminating method was used.
As a packaging material for the back surface (body side), unless otherwise specified, an acrylic solvent-based adhesive (coating thickness is 23 μm thick) is applied to the ^{release paper (paper basis weight 40 g / m 2) of Sun A. Kaken Co., Ltd.} coated, Mitsubishi Chemical Co., Ltd. polyethylene breathable (porous) film 60 g / m ^2; using the packaging material produced by transferring the (air permeability of 12,000 seconds / 100 cc moisture permeability 500g / m ² · 24h). In some comparative examples, a non-woven fabric (Nylon spunbonded non-woven fabric manufactured by Asahi Kasei Co., Ltd., 40 g / m ² , Eltas "N03040") is sprayed on the above-mentioned breathable film as a coating material ("Spray glue 77" manufactured by 3M Japan Ltd.). , 8 g / m ² coating) was prepared, and a packaging material to which the above adhesive was transferred onto a non-woven fabric was used. Details of the pressure-sensitive adhesive application pattern and the like in each Example and Comparative Example will be described later.

These front and back packaging materials are cut into rectangles having a width (short side) of 95 mm and a length (long side) of 130 mm (corresponding to the so-called regular size of a general disposable body warmer), and they are used. The three sides of the stack were heat-sealed with a width of 7 mm along the circumference (edge). This bag is filled with 37 g of a heat-generating composition (manufacturer: Mycoal Corporation, serial number S8WW, expiration date April 2022 "Welcia sticking dandan") from the remaining one side, and this one side has a width of 7 mm. The body warmer was prepared by heat-sealing and sealing. The completed body warmer was sealed in a gas barrier outer bag and stored until it was used as a sample in a heat generation test.

<Adhesive coating pattern>
Example 1:
The adhesive was applied only to the peripheral edge along the long side (20 mm at both ends of the short side 95 mm) (the pattern of FIG. 2, (A)). That is, an adhesive layer having a width of 20 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, the effective bag body area filled with the heat generating composition is 81 mm in width × 116 mm in length, of which the closed area blocked by the adhesive is 13 mm in width × 116 mm in length (× 2). There were several places).

Example 2:
The adhesive was applied only to the peripheral edge along the long side (30 mm at both ends of the short side 95 mm) (the pattern of FIG. 2, (A)). That is, an adhesive layer having a width of 30 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 23 mm × length 116 mm (× 2 places). Met.

Example 3:
The adhesive was applied to the peripheral portion along the long side (28.8 mm at both ends of the short side 95 mm) and the central portion (width 10 mm × length 50 mm) (pattern of FIGS. 2 and (B)). That is, a pressure-sensitive adhesive layer having a width of 28.8 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body, and a pressure-sensitive adhesive layer having a width of 10 mm and a length of 50 mm was provided on the center portion. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 21.8 mm × length 116 mm (× 2). The total was 10 mm in width × 50 mm in length.

Example 4:
The adhesive was applied to the entire circumference of the four peripheral edges with a width of 20 mm (the pattern shown in FIGS. 2 and C). Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 13 mm × length 116 mm (× 2 places). And the total was 13 mm in width × 55 mm in length (× 2 places).

Example 5:
The adhesive was applied to the peripheral portion (29.5 mm and 29 mm from the end of the short side 95 mm) along the long side and the central portion (width 10 mm × length 90 mm) (pattern of FIGS. 2 and D). .. That is, an adhesive layer having a width of 29.5 mm and a length of 130 mm is attached to the peripheral edge of one long side of the bag body, an adhesive layer having a width of 29 mm and a length of 130 mm is formed on the peripheral edge of the other long side, and the center. A pressure-sensitive adhesive layer having a width of 10 mm and a length of 90 mm was provided on the portion. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 22.5 mm × length 116 mm, width 22 mm. It was the total of × length 116 mm and width 10 mm × length 90 mm.

Example 6:
The adhesive was applied only to the peripheral edge along the long side (8 mm from both ends of the short side 95 mm) (the pattern of FIG. 2 and (A)). That is, an adhesive layer having a width of 8 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, the effective bag body area filled with the heat generating composition is 81 mm in width × 116 mm in length, of which the closed area blocked by the adhesive is 1 mm in width × 116 mm in length (× 2). There were several places).

Example 7:
The adhesive was applied only to the peripheral edge along the long side (10 mm from both ends of the short side 95 mm) (the pattern of FIG. 2 and (A)). That is, an adhesive layer having a width of 10 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, the effective bag body area filled with the heat generating composition is 81 mm in width × 116 mm in length, of which the closed area blocked by the adhesive is 3 mm in width × 116 mm in length (× 2). There were several places).

Example 8:
The adhesive was applied in the same manner as in Example 1 (the pattern of FIG. 2, (A)). However, the coating thickness was adjusted to be 80 μm.

Example 9:
The adhesive was applied in the same manner as in Example 1 (the pattern of FIG. 2, (A)). However, the coating thickness was adjusted to 190 μm.

Example 10:
The adhesive was applied in the same manner as in Example 1 (the pattern of FIG. 2, (A)). However, the coating thickness was adjusted to 220 μm.

Comparative Example 1:
The adhesive was applied only to the peripheral edge along the long side (37 mm at both ends of the short side 95 mm) (the pattern of FIG. 2 and (A)). That is, an adhesive layer having a width of 37 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 30 mm × length 116 mm (× 2 places). Met.

Comparative Example 2:
The adhesive was applied only to the peripheral edge along the long side (40 mm at both ends of the short side 95 mm) (the pattern of FIG. 2, (A)). That is, an adhesive layer having a width of 40 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 33 mm × length 116 mm (× 2 places). Met.

Comparative Example 3:
The adhesive was applied to the peripheral portion along the long side (30 mm at both ends of the short side 95 mm) and the central portion (width 10 mm × length 90 mm) (pattern of FIGS. 2 and D). That is, an adhesive layer having a width of 30 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body, and an adhesive layer having a width of 10 mm and a length of 90 mm was provided on the central portion. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 23 mm × length 116 mm (× 2 places). And the total of width 10 mm × length 90 mm.

Comparative Example 4:
The adhesive was applied in stripes on the peripheral edge (short side 95 mm, both ends 20 mm) and the central portion (width 20 mm × length 130 mm) along the long side (pattern of FIGS. 2 and (E)). That is, an adhesive layer having the same width and length (20 mm × 130 mm) was provided on the peripheral edge portion and the central portion of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 13 mm × length 116 mm (× 2 places). And the total of width 20 mm × length 116 mm.

Comparative Example 5:
The adhesive was applied to a total of five locations, the four corners and the central portion, in a circular shape having a diameter of 40 mm (the pattern of FIGS. 2 and (F)). That is, an adhesive layer having the same width and length (20 mm × 130 mm) was provided on the peripheral edge portion and the central portion of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm x length 116 mm) filled with the heat generating composition, the closed area closed with the adhesive is from the total of circles (5 places) with a diameter of 40 mm. The area was obtained by subtracting the area overlapping the heat-sealed part.

Comparative Example 6:
The adhesive was applied to the peripheral portion along the long side (29.5 mm from both ends of the short side 95 mm) and the central portion (width 11.5 mm × length 90 mm) (patterns in FIGS. 2 and D). ). That is, an adhesive layer having a width of 29.5 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body, and an adhesive layer having a width of 11.5 mm and a length of 90 mm was provided on the central portion. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 22.5 mm × length 116 mm (× 2). The total was 11.5 mm in width × 90 mm in length.

Comparative Example 7:
The adhesive was applied only to the peripheral edge portion along the long side (9.5 mm each from both ends of the short side 95 mm) (pattern of FIG. 2, (A)). That is, an adhesive layer having a width of 9.5 mm and a length of 130 mm was provided on the peripheral edges of the two long sides of the bag body. Since the heat seal width is 7 mm, of the effective bag body area (width 81 mm × length 116 mm) filled with the heat generating composition, the closed area blocked by the adhesive is width 2.5 mm × length 116 mm (x 2). There were several places).

Comparative Example 8:
The adhesive was applied in the same manner as in Comparative Example 7 (the pattern of FIG. 2, (A)). However, a breathable packaging material in which a non-woven fabric was laminated was used and applied onto the non-woven fabric.

Comparative Example 9:
The adhesive was applied in the same manner as in Example 1 (the pattern of FIG. 2, (A)). However, a breathable packaging material in which a non-woven fabric was laminated was used and applied onto the non-woven fabric.

<Reference example>
A commercially available disposable body warmer (manufacturer: Mycoal Corporation, serial number S8WW, expiration date April 2022 "Welcia sticking dandan" (heat-generating composition 37 g) was used. The body warmer packaging material is a surface packaging material (body). The opposite side) is a non-breathable film / adhesive / breathable film in order from the outside, and the back surface packaging material (body side) is a non-breathable film / adhesive / release paper in order from the inside. Products containing the exothermic composition of are selected by measuring the weight of each Cairo product and calculating the weight of the exothermic composition by subtracting the weight of the empty bag from which the exothermic composition is extracted from the weight. did.

After performing the JIS S4100 heat generation test described below in the same manner as in Examples and Comparative Examples, a breathable film of the surface packaging material was cut out from the Cairo product and measured by the JIS P8117 Oken type testing machine method. 21,000 seconds / 100cc, moisture permeability was 350g / m ² · 24h.

2. Heat generation test The heat generation characteristics of each sample and commercially available disposable body warmers were tested as follows.

<Fever test method>
Using a heat-generating tester that follows the test method of JIS S 4100 "Usage Sutekairo", a flannel cloth ("F4246 500 flannel bleached brushed") manufactured by Minami Dyeing Co., Ltd. ) Was piled up, a sample was pasted on it, and a heat generation test was carried out. A Japanese paper tape (manufactured by Unique Tape Co., Ltd.) having a length of 5 mm and a width of 15 mm was attached to the thermocouple temperature sensor, and the temperature was measured by attaching it to the center of the body side (back surface) of the disposable body warmer.
The flannel cloth ("F4246 500 flannel bleached brushed") manufactured by Minami Dyeing Co., Ltd. is a covering material "100% cotton tex count 15.905 twin thread flannel" specified in JIS S 4100 "Usage Sutekairo". Is the same as.

<Method of determining heat generation duration and maximum temperature>
The duration of heat generation was measured from the time when the temperature was raised to 40 ° C to the time when the temperature was lowered to 40 ° C. The highest point of each temperature curve was recorded as the highest temperature.
Five samples were measured, and the mean and standard deviation (SD), SD / mean, and the difference between the maximum and minimum values were calculated for each group.

<Calculation method of calorific value>
Each temperature curve is printed on copy paper (Askle's "A4 Multi-Paper Super Economy") with a heat generation temperature of 10 ° C. of 30 mm and a duration of 10 hours of 47 mm, and the temperature is raised to 40 ° C and then falls below 40 ° C. The temperature curve up to (excluding the portion from 0 to 40 ° C.) was cut out with scissors, the weight was measured with an electronic balance, and the value was multiplied by 10,000 to obtain the calorific value.

<Result>
The results are shown in Table 1 (features of each sample and summary of results), Table 2 (total measured values of each sample) and FIGS. 4-13.

From Tables 1 and 2 and FIGS. 4 to 13, it can be seen that the heating tools of the present invention all exhibited higher heat generation efficiency than the heating tools of the comparative examples. Further, with respect to the heating tool of the present invention, the difference in the maximum temperature and / or the amount of heat generated between individuals in the same sample tends to be small, and it can be seen that stable heat generation is maintained. Therefore, the heating device of the present invention tends to have less variation in heat generation characteristics depending on the individual even when manufactured from the same series of breathable films, and a product of stable quality can be manufactured.

Further, when comparing Example 1 with Comparative Example 9 in which only the presence or absence of the non-woven fabric is different, Example 1 is superior in all of the calorific value, the maximum temperature, and the heat generation duration, the heat generation efficiency is high, and the individual The variation between them is also small. Therefore, it is important to use a breathable film or sheet that does not have a non-woven fabric for the back surface (body side) packaging material.

Regarding the thickness of the pressure-sensitive adhesive layer, there was no significant difference between Example 1 (23 μm), Example 8 (80 μm), Example 9 (190 μm), and Example 10 (220 μm), and all of them gave good results.

In Comparative Examples 7 and 8, since the adhesive layer is provided only on the heat-sealed portion, the ventilation surface is not blocked and the ventilation area is large, but the calorific value is low in the closed area ratio. The result was that the maximum temperature varied widely.

3. 3. Actual use test In order to investigate the temperature during actual use, the subjects were made to wear various clothes, and the temperature of the heating device and the skin temperature when they were attached on the clothes were measured as follows.

One of the following three types of clothing was used:
As clothing (underwear) that adheres to the body, UNIQLO's short-sleeved AIRism M size (microfiber polyester, thickness 0.52 mm);
BEAMS HEART short-sleeved big T-shirt L size (75% Polyertel, 25% cotton, 1.29 mm thick) as loose clothing (T-shirt) that does not adhere to the body;
CHARI & CO trainer L size (100% cotton, thickness 2.11 mm) as thick clothing that is relatively close to the body.

Further, in order to reduce the influence of heat dissipation, Kuraray Trading Co., Ltd. CRESTA21 short-sleeved work clothes LL size (80% polyester, 20% cotton, thickness 0.31 mm) was used as a garment to be worn over the above clothing.

Specifically, a subject wearing work clothes on any of the three types of clothing puts two body warmers on the left and right flanks in a constant temperature and humidity chamber at 20 ° C and 65%. I pasted it from and used it at the same time. A thermocouple temperature sensor was attached to the flank at the position where the cairo was affixed and the center of the back surface of the cairo, and the skin temperature and the heat generation temperature were measured for 1 hour from the start of heat generation, respectively. Representative results are shown in FIGS. 14 and 15.

In the heating tool of the present invention, the heat generation temperature changes depending on the type of clothing, whereas in the heating tools of the comparative example and the reference example, the heat generation temperature is almost constant and does not fluctuate even if the type of clothing is different. .. On the other hand, the skin temperature of the heating device of the present invention was substantially constant even if the type of clothing was different, whereas the heating device of the comparative example and the reference example fluctuated depending on the type of clothing. Therefore, in the conventional heating tool, if the clothes are different, the amount of heat reaching the target changes depending on the distance to the target to which the heat is applied, and the sensible temperature changes. A heating tool is provided in which the amount of heat reaching the target is stable even when the distance is long, and the sensible temperature does not change.

1 Heating tool 2 Heat generation composition 3 (Front side) Non-breathable film or sheet 4 (Back side) Breathable film or sheet 5 Adhesive layer 6 Coating material

Claims (6)

In a bag for accommodating a heat-generating composition that generates heat in the presence of air, the bag has a surface applied to an object to which heat is applied and another surface.
(1) The surface applied to the object is made of a breathable film or sheet, and the other surface is made of a non-breathable film or sheet, or is made of a packaging material containing a non-breathable film or sheet. And (2) a sticking means is provided on the breathable film or sheet of the surface applied to the object, and the area blocked by the sticking means or another obstructing agent is the surface applied to the object. Regarding the effective bag area
Blocked area ratio (%) = (closed area / effective bag area) x 100
(Here, the effective bag body area means the area of the effective bag body portion that can accommodate the heat generating composition on the surface applied to the object. The closed area is the pasting of the effective bag body area. An area where the holes are blocked by means or other obstructing agent to make it non-breathable.)
The closed area ratio calculated by is 65% or less, and
Peripheral blockage area ratio (%) = [peripheral blockage area / (peripheral blockage area + non-peripheral blockage area)] × 100
(Here, the peripheral portion is 30% of the longest straight line distance between two points on the circumference (those facing parallel to the side or the tangent line) from the circumference of the effective bag body portion toward the center of the bag body. The peripheral portion closed area means the area of the effective bag body portion formed on the peripheral portion and becomes non-breathable. The non-peripheral portion closed area is the total closed area. , The area that is not the peripheral closed area.)
A bag body, characterized in that the peripheral edge closed area ratio calculated by the above is 85% or more, and (3) a release material is laminated on the sticking means. Breathable film or sheet constituting the surface to be applied to said subject, breathable film of air permeability 100～40,000 (sec / 100 cc) and moisture permeability ^{150~5,000 (g / m 2 · 24h} ) or The bag body according to claim 1, which is a sheet. Breathable film or sheet constituting the surface to be applied to said subject, breathable air permeability 5,000-30,000 (sec / 100 cc) and moisture permeability ^{200~4,000 (g / m 2 · 24h} ) The bag body according to claim 2, which is a film or a sheet. A heating tool comprising the bag according to any one of claims 1 to 3 and a heat generating composition that generates heat in the presence of air contained in the bag. The heating tool according to claim 4, wherein the maximum heat generation temperature is 45 ° C. or higher. The heating device according to claim 4 or 5, which is housed in an airtight outer bag.

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