JP2000083986A - Flat type exothermic body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat type exothermic body which is exactly mountable at a portion most requiring a thermal effect, is capable of sufficiently utilizing the generated heat by the exothermic body and eliminates the odd feel, uncomfortable feel, burn, etc., of the case the exothermic body is used by direct adhesion to the skin of the human body by an adhesion system. SOLUTION: This flat type exothermic body 1 is the exothermic body of a type to house an exothermic compsn. 4 which generates heat in the presence of oxygen into a housing bag consisting of an air permeable enveloping material 2 and an enveloping material 3 for affixation, in which the enveloping material 3 for affixation described above is affixable to clothing and is affixed to the skin side of the clothing in contact with the skin. In such a case, the moisture vapor permeation rate at 40 deg.C and 90% RH of the air permeable enveloping material 2 is preferably set at 180 to 420 g/m2.24 hours and the surface temp. of the air permeable enveloping material 2 at the time of heat generation by the exothermic compsn. 4 at 38 to 50 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flat heating element, and more particularly to a heating element that generates heat in the presence of air and water and is attached by an adhesive method.

[0002]

2. Description of the Related Art In recent years, a portable disposable heating element has been developed which utilizes an oxidative exothermic reaction of metal powder such as iron powder and aluminum powder by oxygen in the presence of an auxiliary agent such as water and salt. Such disposable heating elements are used in such a manner that they are attached to the human body through a mounting device such as a pocket provided in the lower garment, or are attached to the human body by an adhesive method in which the heating element is provided with an adhesive. It is used in close contact with the skin.

[0003] However, in the case of mounting on a human body via a mounting tool, since the mounting position is specified, it is not possible to precisely mount the heating element on a part that requires the most heat effect, and furthermore, the heating element may be exposed to the skin. However, the heat transfer is hindered by contact through the mounting device, and the heat generated cannot be sufficiently utilized.
In addition, when used directly in contact with the skin of the human body by the adhesive method, although such difficulties are resolved, a sense of tension,
Temperature is transmitted directly to the body in case of discomfort due to the flat heating element being in close contact with the body, itching due to plaster, rash, rash, discomfort caused by water droplets accumulating inside the heating element, and abnormal temperature In addition, there is a risk of burns and the like due to the heating element sticking and not moving.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is capable of accurately mounting and using a portion most requiring a thermal effect, sufficiently utilizing heat generated by a heating element, and directly bonding to a human skin by a bonding method. When used in close contact, there is no fear of causing the discomfort, the discomfort and the burn,
An object is to provide a flat heating element.

[0005]

Means for Solving the Problems As a result of earnest research to achieve the object, a so-called pasting type heating element has been developed.
Adhering to the skin side of clothing that comes in contact with the skin not only solves the above-mentioned difficulties when the device is worn on the human body through a wearing device, but also does not directly adhere to the skin of the human body. The inventor has found that there is no pleasure and no possibility of causing the burn or the like, and thus completed the present invention.

That is, the invention according to claim 1 of the present invention is a type in which a heat-generating composition which generates heat in the presence of oxygen is stored in a storage bag comprising a breathable packaging material and a packaging material for sticking. The heating element according to any one of claims 1 to 3, wherein the packaging material for sticking is attachable to clothing, and is attached to the skin side of clothing in contact with the skin.

The exothermic composition is not particularly limited as long as it is a composition capable of utilizing an oxidative exothermic reaction such as a metal powder such as iron powder and aluminum powder or a sulfide of an alkali metal. Alkali metal sulfide as main material, water, water retention agent (wood flour, vermiculite, charcoal, etc.
It is preferable to use a mixture of activated carbon, hillite, water-absorbing polymer and the like, and an oxidizing aid (metal halide or sulfate). Further, inorganic salts as a hydrogen generation inhibitor, a binder as a blending aid, a surfactant as an impregnation aid, and the like may be added.

The air-permeable packaging material used in the present invention is not particularly limited as long as it has air permeability, but its moisture permeability at 40 ° C. and 90% RH is 180 to 4 as in the second aspect of the present invention.
It is preferable to use one having 20 g / m ² · 24 hours, more preferably 220 to 380 g / m ² · 24.
It is good to use the thing of time. The moisture permeability is 420 g / m
^{If the} heat treatment time exceeds 2.24 hours, the surface temperature of the gas-permeable packaging material may increase due to high heat of oxidation reaction, and the temperature may be 180 g / m ^2.
If the heat treatment time is less than 24 hours, the heat of oxidation reaction may be low and the heat effect may be insufficient. In this specification, the moisture permeability at 40 ° C. and 90% RH is based on JIS K
7129 (humidity sensor method). George
sH. This is a value measured using a Lysy-80-4000 model manufactured by Lyssy.

[0009] Such air-permeable packaging materials include porous sheets (including films and membranes; the same applies hereinafter), such as polyethylene and polypropylene having fine and continuous pores on the surface and inside. Examples thereof include ethylene-vinyl acetate copolymers or thermoplastic sheets obtained by flexibly modifying them. Further, those obtained by processing these porous sheets, for example, a laminate of a porous sheet and a non-woven fabric, or a plastic film in which ventilation holes are provided in advance in these porous sheets are laminated. What was done. Commercial products of these porous sheets or porous sheet processed products include NF Sheet or Porum (trade name, manufactured by Tokuyama Corporation) and Cellpore (trade name, Sekisui Chemical Co., Ltd.) Manufactured by Brethlon (trade name, manufactured by Nitto Denko Corporation) or Tyvek (trade name, manufactured by DuPont).

[0010] The adhesive packaging material used in the present invention may be one in which an adhesive is applied to a part or all of the base sheet, and the base sheet may be heat-sealing. Plastic films, nonwoven fabrics, porous sheets, foam sheets or composite sheets obtained by laminating these materials can be used. Preferably, at least polyethylene, ethylene- Vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-methacrylate
A plastic film in which a single or a plurality of films selected from the group consisting of copolymers are laminated, or a laminated sheet in which a nonwoven fabric is further laminated on the outer surface side of the plastic film can be used. The air-permeable packaging material may be used as it is as a base sheet, and an adhesive may be applied to one surface of the substrate sheet to form a packaging material for sticking.

As the pressure-sensitive adhesive, generally known acrylic-based, rubber-based pressure-sensitive adhesives used for pressure-sensitive adhesive heating elements or medical device heating elements,
An adhesive such as vinyl acetate can be used, but an acrylic or rubber (for example, SIS) is preferably used. These may be any of an organic solvent type, an aqueous type and a non-solvent type. The pressure-sensitive adhesive is applied to the outer surface of the base sheet, but is not necessarily provided on the entire surface of one side of the storage bag, and may be provided partially, for example, divided into right and left sides or in a dotted form. .

It is preferable to use a release sheet on these pressure-sensitive adhesives in terms of handling. The release sheet may be made of one or more base materials selected from the group consisting of synthetic paper, polyethylene film, polypropylene film and polyester film, and may be curable on the surface of polyethylene laminated paper or resin impregnated paper. Examples thereof include those in which a cured film of an organopolysiloxane composition is formed.

The flat heating element is used as it is when the peeling sheet is not used, and is used when the peeling sheet is used.
After removing the adhesive, the adhesive is adhered to the skin side of the clothing that comes in contact with the skin, in which case, select an adhesive that can be attached and detached freely. It is preferable because it can be transferred to

[0014] With the above configuration, using an adhesive,
Since the sticking is performed, it is possible to freely select the sticking position of the heating element according to the situation, as compared with a case where the sticking is performed using a wearing tool in advance.
In other words, in addition to being able to accurately attach and use the parts that require the most thermal effect, in this case, if you select an adhesive that can be removably attached, the position of the heating element can be freely moved after attachment. Therefore, it can be more accurately mounted and used on a portion where the thermal effect is most needed. Furthermore, since the heating element is in direct contact with the skin since it is attached to the skin side of clothing that comes into contact with the skin, the efficiency of transferring generated heat to the skin is good, and a favorable thermal effect can be obtained.

[0015] Further, the fact that the heating element is adhered to the skin side of the clothing that comes into contact with the skin means that the heating element does not directly adhere to the skin of the human body, and that the heating element moves with the movement of the clothing due to the movement of the body. Therefore, it can be said that the above-mentioned discomfort and discomfort when directly contacting the skin of the human body do not occur, and the problem such as the burn does not substantially occur.

More specifically, since the heating element is used by attaching the heating element to clothing that comes into contact with the skin, such as underwear, depending on the movement of the body and the state of the body, the air-permeable package between the skin and the heating element is used. A change occurs in the degree of contact with the material surface and in the gap between the two, and the change causes an increase or decrease in the amount of air (oxygen) entering the heat-generating composition through the breathable packaging material. The skin is stimulated by the change in the transmission temperature to the skin based on the fluctuation, and a favorable heating effect is obtained. Also, since it does not adhere to the skin, the temperature of the heating element is abnormal (high temperature abnormality). It is considered that the danger of burns is extremely reduced due to the convective diffusion.

According to a second aspect of the present invention, the air-permeable packaging material has a moisture permeability at 40 ° C. and 90% RH of 1%.
80 to 420 g / m ² · 24 hours, and the surface temperature of the breathable packaging material at the time of heat generation by the heat generating composition is 38 to 5
The flat heating element according to claim 1, wherein the heating temperature is 0 ° C.

In order to obtain a sufficient thermal effect of the body, it is necessary to have a constant warmth and a constant heat retention. In this case, the skin temperature must be in the range of 38 to 45 ° C. Is desirable for securing a favorable thermal effect. According to the second aspect of the present invention, in the heating element in the heat generating state, the moisture permeability in a predetermined range controls the oxidative heat generation reaction, and the surface temperature of the air-permeable packaging material in contact with the skin of the body is 38 to 50. C, resulting in a maximum skin temperature of 3
The temperature is in the range of 8 to 43 ° C., and a favorable heating effect can be secured.

According to the third aspect of the present invention, the display means "the skin side of the body" on the breathable packaging material of the storage bag, and / or the display means "the clothing side" on the sticking packaging material. The flat heating element according to claim 1 or 2, further comprising: Here, "the skin side of the body" provided on the breathable packaging material
Is displayed on the skin surface of the body, and the display on the wrapping material to be attached is "underwear surface". With this configuration, the user can reliably provide the flat heating element on the underwear surface and the breathable packaging material side on the skin surface side of the body without erroneous use. .

According to a fourth aspect of the present invention, there is provided a flat heating element having one surface made of a breathable packaging material having a small elasticity and the other surface made of a sticking packaging material having a large elasticity. 4. The flat heating element according to claim 1, wherein, at the time of heat generation, the end of the heating element is bent upward by 2 mm to 35 mm from the central surface toward the air-permeable packaging material. With such a configuration, the flat heating element of the present invention has a curved state that is appropriately depressed toward the air-permeable packaging material side during heat generation, and thus fits well to a curved portion and a bent portion of the body.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a heating element according to the present invention. 1, a heating element 1
Is generated in a storage bag made of a breathable wrapping material 2 made of a porous sheet 2a and a nonwoven fabric 2b on one side and a sticking wrapping material 3 made of a base sheet 3a, an adhesive layer 3b and a release sheet 3c on the other side. It is formed of a flat bag having no opening and containing the composition 4. When the nonwoven fabric 2b is used on the skin side as a breathable wrapping material, a good texture can be secured.

The exothermic composition 4 includes at least iron powder,
A composition comprising water, a metal halide salt and activated carbon is used. For example, a composition comprising iron powder, saline, activated carbon, and hillite is preferably used. The exothermic composition 4 reacts with oxygen in the air permeating through the air-permeable packaging material during use and iron powder, and generates heat due to the heat of the oxidation reaction. The amount of the exothermic composition filled in the storage bag is preferably 10 to 40 g.

The air-permeable packing material 2 is heated at 40 ° C.
The moisture permeability under the condition of% RH is 180 to 420 g.
/ M ² · 24 hours. By doing so, when the heating element of the present invention is used by sticking it to the inside of clothing that comes into contact with the skin, the surface temperature of the surface of the storage bag that comes into contact with the skin becomes 38 to 50 ° C., and a suitable heating effect is obtained. .

As such a porous sheet 2a, polyethylene, polypropylene, ethylene-vinyl acetate copolymer having the above-mentioned fine and continuous pores on the surface and inside or a thermoplastic resin obtained by flexibly modifying them is used. Sheets can be used.

The non-woven fabric 2b is not particularly limited, and staples of natural fibers or chemical fibers or filaments of chemical fibers can be used as an adhesive, a molten fiber (spun bond method, melt blow method), or a mechanical method (needle punch method). ) Or a cloth-like material bonded by a wet method (papermaking method). As a suitable material, a nylon nonwoven fabric or the like by a spun bond method is preferably used.

As the base sheet 3a, polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-methacrylate copolymer or ethylene-vinyl acetate copolymer, A plastic film in which a plurality of these films are laminated is used. As the release sheet 3c, a synthetic paper, a polyethylene film, a polypropylene film, a polyester film or a laminate of a plurality of these films, polyethylene laminated paper or resin impregnated A paper in which a cured film of a curable organopolysiloxane composition is formed on the surface of paper is used, and an acrylic or rubber (for example, SIS) organic solvent solution is used as the adhesive 3b. The adhesive was applied to the outer surface of the base sheet and provided on the entire surface of one side of the storage bag.

In this embodiment, the flat heating element 1
Is a gas permeable packaging material 2 having one surface made of the porous sheet 2a and the nonwoven fabric 2b, and a bonding packaging material 3 having the other surface made of the base sheet 3a, the adhesive layer 3b and the release sheet 3c. Are laminated, and the edges are heat-sealed with the heat-sealing base sheet 3a leaving a part of the opening portion, and then the exothermic composition 4 is stored from the opening portion. After that, the opened portion is heat-sealed and hermetically sealed to produce the product.

The flat heating element 1 is stored in a non-breathable outer bag when not in use. At the time of use, the non-breathable outer bag also serving as the packaging is broken, and the heating element 1 in which the heat-generating composition is stored in the storage bag formed of the breathable packaging material and the sticking packaging material is removed from the outer bag. After peeling off the release sheet 3c of the body 1, the adhesive sheet 3b is used by attaching it to the inside of clothing that comes into contact with the skin by the adhesive layer 3b. In this case, the flat heating element 1 taken out of the outer bag generates heat by coming into contact with air.

The non-breathable outer bag may be made of a base sheet such as a polypropylene film or a polyester film, a base sheet coated with polyvinylidene chloride, or an aluminum or silicon vapor-deposited material. And a polyethylene film as a heat seal layer for forming a bag for housing the heating element 1 on a laminate of the base sheet and a film selected from a polyvinyl alcohol film, an aluminum vapor-deposited film, and the like. A composite sheet having a low oxygen permeability and a low moisture permeability, which is formed by laminating, is applied.

In this embodiment, the moisture permeability of the air-permeable packaging material is 180 ° C. under the conditions of 40 ° C. and 90% RH under the atmospheric pressure.
Since it is in the range of about 420 g / m 2 · 24 hours, the temperature of the surface of the breathable packaging material can be maintained at 38 to 50 ° C. As a result, the maximum temperature of the skin can be adjusted to the desired 38-
The temperature can be within the range of 43 ° C., and the heating effect during use becomes good.

Furthermore, as described above, since the present heating element is used by sticking it to the inside of clothing such as underwear or the like that comes into contact with the skin, the skin and the breathable packaging material that comes into contact with the skin depend on the movement and condition of the body. As the amount of air (oxygen) entering the heat-generating composition through the breathable wrapping material increases and decreases with the degree of surface contact and changes in the gap between the two, despite the fact that the surface of the heating element directly contacts the skin, Fluctuations in the heat generation temperature due to these changes occur, and the skin is stimulated by the temperature change and relaxed by convective diffusion of the temperature transmitted to the skin, so that a favorable heat effect can be obtained.

As a second embodiment of the present invention, when the heating element 1 is attached to the inside of clothing, the display of "body skin surface" on the air-permeable packaging material side of the storage bag and the packaging material side for attachment. In addition, it is preferable to display a label of "underwear" on the side of the breathable packaging material of the storage bag or a label of "underwear" on the side of the packaging material to be pasted. Such display can prevent erroneous use and ensure correct use.

In the third embodiment of the present invention, as shown in FIG. 2, one surface of the flat heating element is made of a breathable wrapping material having a small degree of expansion, and the other surface is made of a pasting material having a large degree of expansion. It is made of a packaging material to be worn, and the end of the heating element is bent upward by 2 to 35 mm toward the air-permeable packaging material and curved when heat is generated.

As a combination of materials having different degrees of expansion and showing a warp of about 5 to 25 mm, the air-permeable packaging material is a laminated sheet of a porous polyethylene sheet and a nylon nonwoven fabric, The case where the base sheet of the material is a laminated sheet of an ethylene-acrylate copolymer and polyethylene is exemplified. If such a heating element is used, it will be suitable for a curved part and a bent part of the body.

[0034]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

(Example 1) 35 g of a heat-generating composition comprising 100 parts by weight of iron powder, 40 parts by weight of 10% saline, 15 parts by weight of activated carbon and 15 parts by weight of hillstone was mixed with a rectangular sticking packaging material and a rectangular The air-permeable packaging material is superimposed, and the edges are stored in a storage bag made by heat sealing leaving a part of the opening part, and then the opening part is sealed by heat sealing.
"Paste type" heating element with structure shown in (Dimensions: 130m
mx 100 mm).

Here, the air-permeable packaging material is made of a laminated sheet of a polyethylene porous film and a nylon nonwoven fabric (trade name: Breslon, manufactured by Nitto Denko Corporation).
290 g / m ² · 24 hours. Adhesive wrapping material is a laminated sheet of an ethylene-acrylate copolymer and polyethylene on a base sheet, and an acrylic adhesive on an adhesive. As the release sheet, a sheet obtained by forming a cured film of a curable organopolysiloxane composition on the surface of polyethylene laminated paper was used.

A temperature sensor is attached to the surface (nylon non-woven fabric) of the air-permeable wrapping material of the heating element, and a temperature sensor is also attached to the skin surface covered with the heating element. I stuck it to the part located on the inner waist of the underwear. While the body was moving, the temperature change due to the heat generated by the heating element was recorded on a data collector (AM-7001 manufactured by Anritsu Keiki Co., Ltd.) and measured. FIG. 3 shows the temperature change.

The surface temperature of the breathable packaging material varies between 39 and 47 ° C., while the temperature of the skin surface covered with the heating element ranges from 38 to 47 ° C.
41 ° C. As described above, the body temperature changed the surface temperature of the air-permeable packaging material of the heating element, and the skin surface temperature changed accordingly. The surface temperature of the skin was kept at a suitable temperature without causing a low-temperature burn. No stickiness due to perspiration was felt, and the heating element in the heat-generating state was curved so as to fit the surface of the body, and showed a comfortable feeling of wearing. The same heating element created separately above,
It was placed on a horizontal laboratory bench with the adhesive packaging material side down, and the curvature of the heating body in the heating state was measured. As a result, the distance from the laboratory bench to the edge of the heating body was 18 mm.

Example 2 In Example 2, except that the moisture permeability of the gas-permeable packaging material was set to 450 g / m ² · 24 hours.
Performed in the same manner as in Example 1. FIG. 4 shows the resulting temperature change. The surface temperature of the breathable wrapping varied between 46 and 53 ° C, and the temperature of the skin surface covered with the heating element varied between 40 and 45 ° C. Thus, the temperature of the skin surface was higher than in Example 1. However, attaching a heating element to the skin side of clothing that comes in contact with the skin means that the heating element is not in direct contact with the skin of the human body, and that the heating element is attached to the movement of the body and clothing. Combined with the movement, stickiness due to sweating when the skin directly adheres to the skin of the human body by the adhesive method, uncomfortable feeling is not felt, and burns hardly occur. In addition, as a result of the measurement of the curvature of the heating element in the heating state, the distance from the experimental table to the edge of the heating element was 20 mm, and the heating element was curved so as to fit the surface of the body in the heating state.

[0040]

As described above, according to the first aspect of the present invention, a favorable thermal effect can be obtained. This is because the heating element is attached to the skin side of the clothing that comes in contact with the skin, so that the heating element moves with the movement of the clothing due to the movement of the body, and the skin and the air-permeable packaging surface of the heating element Changes in the degree of contact and the gap between the two, the amount of air (oxygen) entering the heat-generating composition through the breathable packaging material increases and decreases, resulting in fluctuations in the heat-generating temperature, and this fluctuation is caused to the skin. It is considered that the change in the transmission temperature causes skin irritation. Furthermore, since it does not adhere to the skin, convective diffusion of heat occurs before the heat is transmitted to the skin in response to abnormal temperature (abnormal high temperature) of the heating element, so there is no risk of burns.

According to the second aspect of the present invention, in the heating element in a heating state, the temperature of the surface of the breathable packaging material in contact with the skin of the body is between 38 and 50 ° C. , The maximum temperature of the skin is in the range of 38-43 ° C,
It is possible to secure a more favorable thermal effect, and claim 3
According to the described invention, the user can surely provide the air-permeable packaging material on the “body skin surface” and the sticking packaging material on the “underwear surface” without mistakenly using the heating element. According to the invention of claim 4 of the invention, materials having different degrees of expansion and contraction due to heat are used for the air-permeable packaging material and the adhesive packaging material, so that the air-permeable packaging material is curved toward the ventilation packaging material side when heat is generated. For this reason, the heating element suitably fits the curved portion and the bent portion of the body.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a flat heating element according to the present invention.

FIG. 2 is a schematic view showing another example of the flat heating element according to the present invention, showing a heating element curved in a heating state.

FIG. 3 is a diagram showing the time course of the surface temperature of the breathable packaging material and the temperature of the skin when the flat heating element of Example 1 is used in contact with the skin.

FIG. 4 is a diagram showing the time course of the surface temperature of the breathable packaging material and the temperature of the skin when the flat heating element of Example 2 is used in contact with the skin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flat heating element, 2 ... Breathable packaging material, 2a ... Porous sheet, 2b ... Nonwoven fabric, 3 ... Packaging material for sticking, 3a ...
・ Base sheet, 3b ... Adhesive layer, 3c ... Peeling sheet
G, 4 ... Exothermic composition.

Claims (4)

[Claims] 1. An exothermic composition which generates heat in the presence of oxygen,
In a heating element of a sticking type housed in a storage bag made of a breathable packing material and a sticking packing material, the sticking packaging material can be stuck to clothing and the skin side of the clothing in contact with the skin. A flat heating element characterized in that it is attached to a flat heating element. 2. The air-permeable packaging material has a moisture permeability at 40 ° C. and 90% RH of 180 to 420 g / m ² · 24 hours. The flat heating element according to claim 1, wherein the heating temperature is 38 to 50C. 3. The skin side of the body is placed on the breathable packaging material of the storage bag.
And / or a sign indicating "clothing side" is provided on the packaging material to be attached.
The flat heating element as described in the above. 4. A flat heating element having one surface made of a gas-permeable packaging material having a small degree of expansion and contraction, and the other surface made of a sticking packaging material having a large degree of expansion and contraction. The end portion is bent upward by 2 mm to 35 mm from the central surface toward the air-permeable packaging material, and is curved.
The flat heating element as described in the above.