JPH0963756A - Desk thermal mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give an adequately warm feeling to a hand without transferring the coolness of a desk thereto during working or studying at a desk in winter. SOLUTION: A table thermal mat 11 is placed on a desk 12. A temperature self-controlled plane heating element 14 built in the table thermal mat 11, in which such sensitive electric resistant composition that carbon powder is dispersed in polyethylene glycol is mixed together with electrodes, is planely rolled and molded. The plane heating element 14 is featured by polyethylene glycol with the molecular weight properly set to be 500-20000, so that the heating temperature can be selectively set within 70 deg.C or less and greatly less varied than that of a PTC heater and a thermostat for temperature control cannot be required. The table thermal mat 11 is foldable to allow a material to be lapped and heating by the folded table thermal mat 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tabletop heating mat to be used by placing it on a desk.

[0002]

2. Description of the Related Art Generally, in winter heating, the entire room is heated by a heating device or the floor surface is heated by a panel heater to enhance the heating effect.

[0003]

Recently, in order to save energy, the heating temperature is often set low. Under such circumstances, a person who works or studies at a desk for a long time often feels cold at the desk because of the coldness of the desk.

The present invention has been made in consideration of the above circumstances, and therefore an object of the present invention is not to feel the coldness of the desk when working or studying at the desk in winter, and to keep it at hand. It is to provide a tabletop heating mat that can obtain an appropriate warmth.

[0005]

In order to achieve the above object, the tabletop heating / heating mat according to claim 1 of the present invention is used by placing it on a desk, and carbon powder is added to polyethylene glycol. The heat-sensitive electric resistance composition is dispersed and mixed with an electrode, and a self-temperature control type sheet-like heat generating element which is roll-formed into a sheet is built in as a heat source.

The feature of the above-mentioned self-temperature control type sheet heating element is that the molecular weight of polyethylene glycol is, for example, 500 to
By appropriately setting in the range of about 20,000, it is possible to arbitrarily set the heat generation temperature in the range of 70 ° C. or lower, which is said to be preferable as a heating element for heating, and
The vertical fluctuation of the heat generation temperature is remarkably smaller than that of the conventional PTC heater, a thermostat for temperature control is not required, and the electric circuit configuration is also very simple. If you use a tabletop heating mat with such a self-regulating type sheet heating element mounted on a desk, you will not feel the coldness of the desk when you work or study at the desk in winter. In addition, you can get a comfortable warm feeling at hand.

Further, in the second aspect, the self-temperature control type sheet heating element is divided into a plurality of pieces so that the tabletop heating mat can be folded. In this configuration, the tabletop heating mat can be used as a device for heating the tabletop heating mat by wrapping the object to be heated with the folded tabletop heating mat and causing the planar heating element to generate heat.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The tabletop heating mat 11 is used by placing it on the desk 12. This tabletop heating mat 11 has a structure in which two sheets 13 made of synthetic resin are formed into a bag shape by bonding, fusing, stitching or the like, and a self-temperature control type sheet heating element 14 is housed inside. ing. As shown in FIG. 2, the constitution of the self-temperature control type planar heating element 14 uses a thermosensitive electric resistance composition 15 made by uniformly dispersing carbon powder in polyethylene glycol. Polyethylene terephthalate film 17 in which the object 15 is mixed with the electrode 16 and roll-formed into a planar shape, and the front and back surfaces thereof are bonded to the inner surface by a nonwoven fabric,
It is configured to be sandwiched by 17 sandwiches.

In this case, carbon powder to be dispersed in polyethylene glycol can be used in various forms, for example, widely used from amorphous carbon black to crystalline graphite, and its mixing ratio is 5 to 45 wt%. It is preferable to set within the range. However, it is preferable that a carbon powder having a low bulk density such as acetylene black has a small mixing ratio, and a carbon powder having a low bulk density such as graphite has a large mixing ratio.

The advantage of the self-temperature control type sheet-like heating element 14 thus constructed is that it is preferable as a heating element for heating by appropriately setting the molecular weight of polyethylene glycol in the range of, for example, about 500 to 20,000. It is said that the heat generation temperature can be arbitrarily set within the known range of 70 ° C or less, and the vertical fluctuation of this heat generation temperature is significantly smaller than that of the conventional PTC heater, and a thermostat for temperature control is not required. There are also advantages. When the desk-top heating mat 11 having such a self-temperature control type sheet-like heating element 14 built-in as a heat source is placed on the desk 12 for use, when working or studying toward the desk 12 in winter. Moreover, it is not necessary to feel the coldness of the desk 12, and a pleasant warmth can be obtained at hand.

Further, in this embodiment, as shown in FIG. 3, in order to make the tabletop heating mat 11 foldable,
The planar heating element 14 is divided into at least two. By folding the tabletop heating mat 11 to wrap the object to be heated (for example, the heat treatment bean curd 18) and causing the planar heating element 14 to generate heat, the tabletop heating mat 11 can be used as a device for heating the object to be heated. Can be used.

As shown in FIG. 4, the heat treatment bowl 18 capable of storing heat with the tabletop heat mat 11 has a construction in which a polyethylene bag 20 having an average molecular weight of 500 to 6000 is enclosed as a heat storage medium in a sealed bag 19. Is. The sealing bag 19 is formed by joining the periphery of a thermoplastic sheet having a melting point of 100 ° C. or higher (for example, a sheet of polyethylene, polypropylene, polyester, nylon, etc.) by heat fusion or the like, and in order to prevent the polyethylene glycol 20 from leaking, It has a double structure consisting of an inner bag and an outer bag.

As described above, when polyethylene glycol 20 having an average molecular weight of 500 to 6000 is used as the heat storage medium, the temperature of the heat treatment bean curd 18 (the melting temperature of the polyethylene glycol 20) is adjusted to a temperature suitable as a heat source for heat treatment. The temperature can be set within the range of 30 ° C to 65 ° C, and the latent heat associated with the phase change can be used to efficiently store heat in that temperature range, thus maintaining the thermotherapy effect for a long time. You can Furthermore, the melting temperature can be adjusted by changing the average molecular weight of polyethylene glycol 20, and for example, when used for cancer treatment, in the temperature range where only cancer cells are killed without adversely affecting benign cells of the human body. 40 ° C ~ 45
The melting temperature may be set to about ℃.

Anka 1 for hyperthermia treatment in such a temperature range
8 is suitable for storing heat in the tabletop heating mat 11,
The temperature of the heat treatment bean curd 18 does not become too high, and the heat can always be stored at an appropriate temperature, and after the heat storage, the heat treatment bean curd 18 can be used immediately without cooling.

The object to be heated by the tabletop heating mat 11 (heat retention / heat storage) is not limited to the heat treatment bean curd 18 and may be another object such as a bento box.

[0016]

As is apparent from the above description, the tabletop heating mat according to claim 1 of the present invention is a self-temperature controlling type sheet using a heat-sensitive electric resistance composition obtained by dispersing carbon powder in polyethylene glycol. Since it has a built-in heating element,
By placing this tabletop heating mat on a desk and using it, you do not have to feel the coldness of the desk when you work or study at the desk in winter, and you can get a comfortable warmth at hand. it can. Moreover, the vertical fluctuation of the temperature of this tabletop heating mat is much smaller than that of the conventional PTC heater, a thermostat for temperature control is not required, the electric circuit configuration is extremely simple, and the demand for cost reduction can be satisfied. it can.

Further, according to the second aspect, the self-temperature control type sheet heating element is divided into a plurality of pieces so that the tabletop heating mat can be folded, so that the object to be heated is wrapped by the folded tabletop heating mat and heated. The tabletop heating mat can also be used as a device for heating an object to be heated, which has a wide range of use and is extremely convenient.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mode of use of a desk heating mat according to an embodiment of the present invention.

[Figure 2] Partial enlarged vertical cross-section of the tabletop heating mat

FIG. 3 is a side view showing another usage mode of the tabletop heating mat.

FIG. 4 is a perspective view showing a heat treatment anchor with a part thereof cut away.

[Explanation of symbols]

11 ... Desktop heating mat, 12 ... Desk, 14 ... Self-temperature control type sheet heating element, 15 ... Thermosensitive electrical resistance composition, 16 ... Electrode, 17 ... Film, 18 ... Anka for thermotherapy (object to be heated) , 20 ... Polyethylene glycol.

Claims (2)

[Claims] 1. A tabletop heating and heating mat to be placed on a desk for use, wherein a thermosensitive electrical resistance composition prepared by dispersing carbon powder in polyethylene glycol is mixed with electrodes and rolled into a planar shape. A tabletop heating mat with a temperature control type sheet heating element built in as a heat source. 2. The tabletop heating mat according to claim 1, wherein the self-temperature control type sheet heating element is divided into a plurality of pieces to make the mat foldable.