JPH0437871Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a heating element that generates heat upon contact with oxygen.

[Conventional technology]

Disposable body warmers are mainly composed of iron powder and reaction aids such as water, sodium chloride, and activated carbon, and use a heating element that generates heat when it comes into contact with oxygen.In recent years, they have become widely available on the market. It's on.

Conventionally, such a disposable body warmer is one in which a breathable inner bag is filled with the heating element, and this is further sealed and stored in a non-breathable outer bag. When in use, the outer bag is opened and outside air is brought into contact with the inner bag filled with a heating element to generate heat.

However, with conventional heating elements, the iron powder that is the heat source inside the bag is biased toward the bottom, causing uneven heat generation, and the entire surface of the inner bag does not have a uniform temperature.
In addition, there was a problem in that iron powder gathered into lumps after heat generation, resulting in poor contact feel during use.

[Problems to be solved by the invention] Therefore, this invention solves the problems of the conventional heating element described above, namely, that the entire surface of the inner bag does not have a uniform temperature, and that there is a feeling of contact when using it. This is an attempt to solve the problem of deterioration.

[Means for solving problems]

Therefore, in this invention, the iron is made into a thin sheet made of iron fibers, and a heating element is made by laminating a plurality of sheets of iron with a reaction aid interposed therein.
Solved the above problems.

[Effect]

Since the iron is in the form of a sheet made of iron fibers, it does not shift toward the bottom. Furthermore, since the reaction aid is sandwiched between sheets of iron made of iron fibers, it does not shift toward the bottom. Therefore, iron does not aggregate into lumps.

〔Example〕

Hereinafter, the configuration of this invention will be explained with reference to the drawings showing one embodiment.

In the figure, 1 is a disposable body warmer using the heating element of this invention, in which a breathable inner bag 2 is filled with the heating element, and this is further sealed and stored in a non-breathable outer bag 3. There is. As the inner bag 2,
Cloth, breathable resin, or other appropriate breathable material is used, and the outer bag 3 is made of non-breathable heat-fusible synthetic resin film such as polyethylene or polypropylene, or other suitable non-breathable material. . The heating element is composed of a sheet-like iron 4 made of a plurality of thinly formed iron fibers and various reaction aids 5. That is, in the embodiment, a laminate is used in which a reaction aid 5 is interposed between sheet-like iron 4 made of a plurality of layers of iron fibers.

The iron fiber is preferably as thin as possible (100 μm or less in diameter) from the viewpoint of flexibility and reaction surface area.
The reaction aid 5 consists of water, an oxidation promoter such as sodium chloride, and a water retaining material such as activated carbon, sawdust, perlite, etc., if necessary, but is not particularly limited, and may be any conventionally known appropriate component. I can do it.

Next, a temperature characteristic test was conducted using the heating element of this invention and the conventional heating element, with the amounts of iron and reaction aid being the same for both.

For measurement conditions, procedures, etc. of temperature characteristic tests, please refer to
Conforms to Japanese Industrial Standard S4100-1985 (use color). Based on this measurement data, a temperature characteristic curve (shown in FIG. 5) was created, and the maximum temperature, rise time, and duration were determined.

Sample component heat source: The heating element of this invention uses a sheet of iron made of iron fibers (fiber diameter 25μ, size 43mm).
×80mm, 12 layers) was used at 7800mg. The conventional heating element used 7800 mg of iron powder (150 mesh).

Reaction aids: 2700 mg of activated carbon and 20 c.c. of 20% sodium chloride solution were used in both cases.

The maximum temperature, rise time, and duration are as follows.
The Japanese Industrial Standard S4100-1985 (use color) is stipulated as follows.

Maximum temperature: around 70℃ for safety during use.

Rising time: The time required to raise the temperature to 40°C after the start of heat generation.

Duration: The time the temperature is maintained at 40°C or higher.

As is clear from the above temperature characteristic curve, the heating element of this invention has the following characteristics when compared with the conventional heating element:
The duration is significantly longer (conventional example: 6 hours 20 hours) with almost no change in maximum temperature or rise time.
minutes, this idea: approximately 9 hours 00 minutes).

[Effect of idea]

Since this idea is structured as described above,
Inside the inner bag 2, the iron and reaction aids are not concentrated toward the bottom, so heat generation is uniform, and the heat is evenly transmitted to the surface of the inner bag 2, making the entire surface of the inner bag 2 at an appropriate temperature. Since they do not aggregate to form lumps, the contact feeling does not deteriorate during use, and furthermore, since no violent local reactions occur, they have excellent effects such as a long duration of heat generation.

Furthermore, this invention has the additional effect of being easy to manufacture, since the heating element can be formed by simply laminating a plurality of sheet iron sheets with a reaction aid interposed therebetween.

[Brief explanation of drawings]

Figure 1 is a perspective view of a disposable body warmer using the heat generating element of this invention, Figure 2 is a longitudinal cross-sectional view of the same, Figure 3 is an enlarged view of the circled area in Figure 2, and Figure 4 is a perspective view of a disposable warmer using the heating element of this invention. FIG. 5 is a plan view of a sheet-like iron made of fibers, and is a diagram showing temperature characteristic curves of the heating element of this invention and a conventional heating element. 2...Inner bag, 4...Sheet-like iron made of iron fiber, 5...Reaction aid.

Claims (1)

[Scope of utility model registration request] In a heating element that mainly consists of iron and a reaction aid and generates heat upon contact with oxygen, the iron is formed into a thin sheet made of iron fibers, and a plurality of sheets of iron are formed by interposing a reaction aid. A heating element characterized by being laminated.