JP2000342618A - Warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the solidification of a heating element to solve the movement or the bias of the generated heat and improve the heat retaining property and fitting property by forming the heating element to be interposed between permeable surface and reverse sheets and generate heat by the contact with air by mixing a fiber having an average fiber length longer than the thickness of the heating element with a heating agent. SOLUTION: This warmer 1 comprises permeable surface and reverse sheets 2, 3 and a heating element 4 for generating heat by the contact with air interposed between them. The heating element 4 is formed by mixing a fiber 41 having an average fiber length longer than the thickness of the heating element 4 with a heating agent 42. When the average fiber length is smaller than the thickness of the heating element 4, the fiber 41 cannot be satisfactorily entangled in the heating agent 42 to deteriorate the performance for retaining the metal powder. The average fiber length of the fiber 41 is preferably set longer than the thickness of the heating element 4 by 0.1-100 mm. The mixing ratio of the fiber to the heating agent is preferably set to 0.05-10 pts.wt. to 100 pts.wt. of the heating agent. According to this, since the fiber is fitted between the heating agents to prevent its solidification, the flexibility and fitting property can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device which is thin, has no heat retention, and has a high heat retaining property and a good fit to a body without any movement or bias of a heating element.

[0002]

2. Description of the Related Art A conventional heating element such as a disposable body warmer has a shape in which a heating agent is sealed between a gas permeable sheet and a back sheet, and is filled with the heating element. When the exothermic agent such as iron powder is used, the powder adheres to each other at the end of the heat generation, becomes a plate or a crushed product, and becomes hard. For this reason, a warmer or the like in which a bag for encapsulating the exothermic agent is divided has been proposed. Affects feeling.

[0003] Further, a warmer in which a heating agent is dispersed and held in a nonwoven fabric (Japanese Patent Application Laid-Open No. 8-173471) or a warmer in which a heating element is formed by mixing a heating agent with pulp (Japanese Patent Publication No. 8-121) Has also been proposed. However, in the warmers according to these proposals, the filling amount of the heating agent per unit area is small, the thickness of the heating element is increased more than necessary,
Also, the heat generation effect is poor.

Accordingly, it is an object of the present invention to provide a thin, heat-insulating and heat-insulating body without increasing the thickness of the heating element, being flexible, having little solidification of the heating element due to heat generation, free of movement and offset of the heating element. An object of the present invention is to provide a heating device having a high fitting property.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above object can be achieved by mixing a heating agent with a fiber having a specific average fiber length. Was completed. That is, the present invention relates to a heating tool comprising a heating element that generates heat in contact with air between a permeable top sheet and a back sheet, wherein the heating element has an average fiber length of the heating element. The object has been achieved by providing a heating tool formed by mixing a fiber longer than the thickness of the fiber and a heating agent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the heating device of the present invention will be described below. Heating device 1 of the present embodiment
Has a heating element 4 which is in contact with air and generates heat between air-permeable top sheet 2 and back sheet 3. The heating device 1 of the present embodiment is a device in which a mixture of a heating agent 42 and a fiber 41 as a heating element 4 described later is sealed between a rectangular back sheet 3 and a rectangular top sheet 2. Yes, such a form is the same as a conventional heating tool such as a disposable body warmer.

Thus, in the heating device 1 of the present embodiment,
The heating element 4 is formed by mixing a fiber 41 having an average fiber length longer than the thickness of the heating element 4 and a heating agent 42. If the average fiber length is less than the thickness of the heating element 4, the fibers 41
And the exothermic agent 42 are not entangled well, and the performance of holding the iron powder is inferior.

More specifically, the average fiber length of the fibers 41 is preferably 0.1 to 100 mm longer than the thickness of the heating element 4, more preferably 1 to 5 mm. 100m
m, it becomes difficult to mix and disperse the fibers,
When it is less than m, the fiber and the exothermic agent are less likely to be entangled with each other, so that the content is preferably within the above range. The thickness of the heating element is preferably 0.1 to 1 cm, and 0.1 to 1 cm.
More preferably, it is 0.5 cm. If it exceeds 1 cm, you will feel uncomfortable when wearing it, and if it is less than 0.1 cm,
Since the amount of the filled powder becomes too small and the heat generation performance is reduced, it is preferable that the amount is within the above range.

The fibers are not particularly limited, and may be either organic fibers or inorganic fibers. Usually, organic fibers are used, and the material for forming the fibers is, for example, pulp, viscose rayon, cotton, hemp, Natural fibers such as wool, polyesters such as polyethylene (PE), polypropylene (PP), nylon, and polyethylene terephthalate (PET), and synthetic fibers such as polyurethane. The fineness of the fiber is preferably 0.1 to 40 d, and 1 to 20 d
More preferably, If it exceeds 40d, the entanglement between the fibers is small, and if it is less than 0.1d, the ability to hold the fibers may be reduced.

The exothermic agent is not particularly limited as long as it generates heat in the presence of air. For example, a metal chloride such as NaCl, KCl, MgCl ₂ , CaCl ₂ , K ₂ SO ₄ , Na ₂ SO ₄ , MgSO ₄
Metal sulphate or other compounds that can be reaction aids, water and humectants that absorb water well (eg, activated carbon, silica gel, wood flour, water-absorbing polymer, etc.) and, if necessary, additives such as vermiculite And the like.

The mixing ratio of the heating agent to the fiber is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 2 parts by weight, per 100 parts by weight of the heating agent. preferable. If the amount exceeds 10 parts by weight, the thickness of the heating element becomes too large, and if the amount is less than 0.05 part by weight, the effect of preventing the fibers from shifting becomes small. That is, in the present invention, since the fibers have the above-mentioned specific average fiber length, even in the blending ratio in this range, there is a sufficient effect to prevent the exothermic agent from solidifying.

As the material for forming the top sheet and the back sheet, those used for the conventional heating device can be used without any particular limitation. Moisture permeability measured by 50
~10000g / m is preferably breathable sheet ² · d, more preferably breathable sheet 100~5000g / m ² · d, also, the backsheet, breathable sheet and air-impermeable sheet Either can be used.

[0013] The heating device of the present embodiment, after superimposing the top sheet and the back sheet in accordance with a conventional method, and then 3
The sides are sealed by heat sealing or the like, and then a mixture of a heating agent and a fiber is injected between the two sheets.
It is obtained by sealing the sides.

The heating device of the present invention prevents fibers from entering between the heating agents to prevent solidification, as compared with a heating device such as a conventional heating device such as a warmer, in which the heating agent solidifies after heating and loses flexibility. Regardless of before and after fever, the flexibility is maintained and the fit to the body is good. In addition, since the fibers prevent the exothermic agent from moving, the exothermic agent is less likely to be displaced, so that the feeling of wearing is good.

The heating tool of the present invention can be applied to ordinary disposable warmers, articles which exert their effects when heated, and the like. In addition, the heating tool of the present invention may have a circular or irregular shape instead of the rectangular shape as in the above-described embodiment.

[0016]

[Example 1] Iron powder (trade name "RKH" manufactured by Dowa Mining Co., Ltd.) 57 wt%, 5 wt% saline 29 wt%
%, Activated carbon 1.4wt%, vermiculite 5.8wt
%, Water-absorbing polymer (Mitsubishi Chemical's trade name "Aqua Pearl AIB") 4.2 wt%, calcium silicate 2.6 wt%
% To give an exothermic agent. In addition, PET (fineness 2d ×
Using a fiber length of 5 mm) as a fiber, 18 g of the exothermic agent and 2 g of the fiber were mixed to obtain 20 g of the exothermic agent. 20 g of the obtained exothermic agent is used as a surface sheet as a moisture permeable sheet (produced by Kojin,
The heating tool shown in FIG. 1 was produced by interposing between the trade name “TSF-EDFH”) and the PE sheet as the back sheet (the size of the heating element: width 10 cm × length 12 cm ×).
Thickness 1.5 mm).

The resulting heating device was heated and evaluated for flexibility and offset after the heating according to the following evaluation method. At this time, JIS S4100-1996
The exotherm was evaluated by the temperature characteristic measuring method described above. The results are shown in [Table 1]. Flexibility evaluation method: Flexural rigidity after the end of heat generation (after standing in air for 24 hours) was measured. The bending stiffness measurement conditions are a distance between supporting points of 60 mm and a pushing speed of 300 mm / min.
The lower the number, the more flexible. Evaluation method of offset: measuring the upper end position B of the powder in the bag after shaking the heating tool up and down 10 times vertically when the heat generation is started, and determining this value as the length of the heating tool The value divided by A is defined as the degree of deviation. The larger the value, the greater the deviation. The evaluation was performed as follows. Evaluation B ÷ A ○ 未 満 Less than 0.1 △ ０．１ 0.1 or more and less than 0.2 × ０．２ 0.2 or more

Example 2, Comparative Examples 1 to 3 Using a heating tool manufactured in the same manner as in Example 1 except that the fiber length was set to the value shown in Table 1, as in Example 1, An evaluation was performed. The results are shown in [Table 1].

[0019]

[Table 1]

[0020]

The heating device according to the present invention is thin and has a low heat insulating property without increasing the thickness of the heating element, is flexible, has little solidification of the heating element due to heat generation, does not move or lean the heating element. And it has a high fit to the body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a heating device of the present invention.

FIG. 2 is a sectional view schematically showing a section taken along line XX of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating tool 2 Ventilation sheet 3 Back sheet 4 Heating element 42 Heating agent 41 Fiber

Claims (3)

[Claims] 1. A heating tool comprising a heating element which generates heat in contact with air between a gas permeable top sheet and a back sheet, wherein the heating element has an average fiber length of the heating element. A heating tool formed by mixing fibers longer than the thickness and a heating agent. 2. The heating tool according to claim 1, wherein the average fiber length is 0.1 to 100 mm longer than the thickness of the heating element. 3. The mixing ratio of the fiber and the exothermic agent is as follows:
With respect to 100 parts by weight of the exothermic agent, the fibers 0.1 to 1
The heating tool according to claim 1 or 2, which is 0 parts by weight.