JPH0790031B2 - Use up Cairo - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable warmer in which a heat-generating composition which generates heat in the presence of air is enclosed in a storage bag having a storage bag having fine pores.

[0002]

2. Description of the Related Art An exothermic composition composed of iron powder, water, a water retention agent, an oxidation aid and the like generates heat simply by contacting with air without requiring ignition. Therefore, the exothermic composition has a vent hole. Hand-held Cairos stored in bags are widely used. Current,
In many widely used hand warmers, a bag material in which polyethylene is laminated as a sealant on a non-woven fabric is used.
Although a method of forming a needle hole has been adopted, recently, it has been illustrated that a film having fine pores can be used as a bag material for a bag containing a heat-generating composition (Japanese Patent Laid-Open No. 1-2184).
47).

[0003]

In order for the conventional used body warmer to have suitable preferable heat generation performance such as heat generation temperature and heat generation time, the components, composition and filling amount of the heat generation composition are also important. However, even if the optimum exothermic composition is used, it is not possible to produce a body warmer with a certain standard unless the supply rate of oxygen to the exothermic composition is controlled. Generally, the supply rate of oxygen is indicated by the air permeability of the bag material of the exothermic composition-containing bag. The higher the air permeability, the faster the initial heat generation, the higher the maximum temperature, and the shorter the duration. If the bag has needle holes,
By adjusting the form, number, size, etc. of the needle holes, it is possible to adjust the air permeability, but if the fine pore film is provided with needle holes to adjust the air permeability, There is a drawback that the characteristics of the body warmer created by using it are lost. That is, in the body warmer using the fine pore film, when the oxygen in the bag is consumed by the exothermic reaction, the pressure inside the bag is reduced, and the contents are not biased during use of the body warmer, which is easy to use. If the film is provided with needle holes, the inside of the bag is not depressurized and the above properties are lost. As a method of adjusting air permeability without providing needle holes, a method of appropriately heat-sealing a desired portion of a sheet having fine continuous pores (Japanese Patent Publication No. 1-30169), or a sheet having breathable fine holes There is a method of coating a resin-based substance partially or on the entire surface (Japanese Patent Laid-Open No. 59-37147), but each requires a special mechanical device, and in heat fusion, pressure and heat flow during processing are used. Because the shape and size of the pores are indeterminate, it is difficult to control the air permeability, or when heat fusion is performed to the extent that it is not air permeable, processing reduces the air permeability of the film. In addition, when applying a resin-based substance, there is a fluctuation in the size of the ventilation hole due to the adhesion of an adhesive to the ventilation hole and a change in the air permeability caused by a change in the application area of the resin-based substance. The difficulty of
Alternatively, there are drawbacks such as difficulty in bag-making sealing due to uneven thickness of the bag material and heat conductivity due to the partially applied resin-based substance. In view of the above problems, it is an object of the present invention to provide a hand warmer that can easily adjust the air permeability of a storage bag without lowering the air permeability of a storage bag having fine pores.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a body warmer in which an exothermic composition comprising iron powder, activated carbon, salts, a water retention agent, etc. is enclosed in a storage bag having fine pores. In the above, the gist is that a non-air-permeable low-temperature heat-fusible film is brought into contact with a part of the inner surface of the storage bag in a non-adhesive state.

[0005]

[Function] The characteristic feature of a use-use body warmer in which a heat-generating composition that generates heat in the presence of air is enclosed in a storage bag having fine pores is as follows.
Although the inside of the storage bag is decompressed due to the oxygen consumption due to the exothermic reaction, the contents are not biased by being pressed by the atmospheric pressure, but according to the present invention, the film sealed by contacting the inner surface of the storage bag is also When the film is pressed by the atmospheric pressure and comes into close contact with the inner surface of the storage bag, the air is blocked at the place where the film is in contact, and the air permeability can be adjusted by making the film non-air permeable. The film used here does not need to be adhered to the storage bag in advance by using an adhesive or by heat fusion.

[0006]

The present invention will be described below with reference to the drawings. 1 in the figure
Represents an exothermic composition, which is usually iron powder, an oxidizer such as salt, water, activated carbon and, if necessary, a water retention agent such as wood powder and perlite, a polymeric water absorbing agent, or hydrogen metathesis suppressing agent such as sodium metasilicate. Although the agent is added, the composition is not limited in the present invention.

Reference numeral 2 denotes a heat-generating bag storage bag for storing the heat-generating composition 1, and a bag material having fine pores is used. Examples of the fine pore film include polyethylene, polypropylene, polyurethane having fine pores, thermoplastic sheets or films made of plastics and rubbers obtained by flexibly modifying them, or the like, and may be used alone. Further, a non-woven fabric or the like may be laminated for reinforcement.
Commercially available products include Typec (made by DuPont), Serpore (made by Sekisui Chemical), NF sheet (made by Tokuyama Soda), Opcel (made by Sanwa Processing), Rubycell (made by Toyo Polymer), etc. Has Breathlon (manufactured by Nitto Denko). Further, the heat-generating composition storage bag 2 does not necessarily need to have fine pores on the entire surface, and the area of the portion having fine pores is arbitrary as long as the heat generating performance of the body warmer can be ensured by using it. For example, one side may be composed of a storage bag having no fine pores. The thickness of the heating element storage bag 2 made of these films is appropriately selected in consideration of its physical properties, that is, breathability, tear strength, processability, feel, etc. Used in the range of 3 mm.

The low-temperature heat-fusible film 3 of the present invention may be any film that can be heat-sealed at a temperature lower than that of the storage bag 2 having fine pores. Depending on the material of the storage bag 2, polyethylene, polypropylene or polyurethane can be used. A film of ethylene vinyl acetate copolymer or the like is used, and the size is appropriately determined depending on the air permeability of the storage bag and the air permeability desired to be achieved. Further, the entire film does not need to be non-breathable, and a film cut into a pattern or a film having fine pores may be used. The thickness of the film depends on the manufacturing machine used, but is 1 to 100 in consideration of thermal conductivity and mechanical strength.
Appropriately decided in the range of μm. Although FIG. 1 exemplifies a three-way seal body warmer, it is not necessarily a three-way seal, and of course, a four-way seal may be used.

<Test Example 1> Breathlon (manufactured by Nitto Denko) was used as a bag material for the heat-generating composition storage bag, and a low temperature heat-fusible polyethylene film (thickness: 25 μm) was brought into contact with the inner surface of the storage bag, 9 x 1
8 cm), and set the maximum temperature to JIS S4100
It was measured by the method specified in 5.6. The polyethylene film was sealed so that it came into contact with the body warmer in the longitudinal direction with a constant width.

[0010]

[Table 1]

As a result of the above test, as the area of the storage bag that is not ventilated, that is, the width of the film, is increased, the maximum temperature is lowered, and the effect of adjusting the air permeability of the film stored in contact with the storage bag becomes clear. It was

Test Example 2 Breathlon (manufactured by Nitto Denko, width 18 cm) was used as a bag material for the heat-generating composition storage bag, and low temperature heat-fusible polyethylene (width 4 cm) or polypropylene film (width 4 cm) was used.
cm) was brought into contact with the inner surface of the storage bag, and a body warmer was manufactured with a filling and sealing machine.

[0013]

[Table 2]

When the low-temperature heat-fusible polyethylene film was used, sealing was possible at almost the same sealing temperature as when the film was not sealed, but when the polypropylene film was sealed, it was necessary to raise the sealing temperature. Therefore, the texture was impaired and a poor seal was observed. It was found that Cairo cannot be manufactured because a porous polyethylene film is used for Breathlon, and if a film that is heat-sealed at a higher temperature than polyethylene such as polypropylene film is enclosed, a sealing failure will occur during manufacturing. .

[0015]

According to the used body warmer of the present invention, the breathability of the storage bag having fine pores can be adjusted easily and at low cost without lowering the breathability of the storage bag. Thus, it is possible to obtain a used body warmer having different heat generation characteristics such as heat generation temperature and heat generation duration.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a used body warmer according to the present invention.

FIG. 2 is a sectional view thereof.

[Explanation of symbols]

 1 exothermic composition 2 exothermic composition storage bag 3 low temperature heat-fusible film

Claims (1)

[Claims] 1. A use-use warmer in which a heat-generating composition comprising iron powder, activated carbon, salts, a water retention agent, etc. is enclosed in a storage bag having fine pores, and a part of the inner surface of the storage bag has a non-air-permeable low temperature. A body warmer that is characterized in that a heat-fusible film is brought into contact with the non-bonded state.