JPH0282483A - Far infrared ray radiator for heating and heat radiation - Google Patents

Abstract

PURPOSE:To enable heating effect and heat radiating effect to be greatly improved by covering both sides of obverse and reverse of a board with far infrared ray radiating materials. CONSTITUTION:Both sides of obverse and reverse of a base material are covered with far infrared ray radiating materials which radiate far infrared rays. In general, if any cover is formed at the surface of the base material, in case of considering the thermal conductivity of a substance, it is presupposed that the cover acts as heat insulating material, but in fact by providing the far infrared ray radiating materials on both sides of the base material, heat radiation property and heat dissipation property can be improved greatly. Further, as a far infrared ray radiating material to cover the base material, public various kinds of materials such as, for example, alumina, magnesia, zirconia, etc., can be used.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a far-infrared radiator for heating and heat radiation.

(Background Art) Far-infrared radiators have conventionally been used for various purposes. Examples of its uses include, for example, indoor heating and drying of various supplies, cooking such as baking food, drying and baking of paint, and use for health promotion purposes and medical purposes. Can be done.

As shown in these examples, conventional far-infrared radiators are mostly used for heating purposes such as space heating. However, the fact that far infrared rays are effective as a heat radiator means that they are also effective for heat radiation. Therefore, it is conceivable to use a far-infrared radiator as an effective heat radiator.

BACKGROUND ART Recently, as electronic components have become highly integrated, the amount of heat generated from electronic components has increased, and the heat dissipation properties of electronic component packages, casings, etc. have become a problem. Furthermore, in electrical equipment, etc., a large amount of heat is generated around a power supply unit such as a transformer, so there has long been a demand for improved heat dissipation around the power supply unit.

In view of the above-mentioned problems, the present invention was achieved as a result of research to obtain a radiator with high far-infrared radiation efficiency, which has better heating characteristics than conventional far-infrared radiators, and has heat dissipation. Heating that also works effectively on the body
The present invention aims to provide a far-infrared radiator for heat radiation.

(Summary of the invention) The structure of a conventional far-infrared radiator is that one side of the base material is made of a material with good far-infrared radiation characteristics (hereinafter referred to as far-infrared radiator).
Usually, the surface facing the object to be heated is coated with a far-infrared radiation material. For example, in a container that heats water, the inside of the container (the side that comes into contact with the water) is coated with a far-infrared radiating material. in this way,
It has actually been confirmed that the heating effect can be enhanced by coating the surface of the base material with a far-infrared radiating material.

Conventionally, only one side of the base material is coated with a far-infrared emitting material as described above, but the inventor of the present invention conducted tests using samples in which the surface of the base material was subjected to various treatments. discovered that heating effects and heat dissipation effects can be greatly improved by coating both the front and back surfaces of a base material with a far-infrared radiating material.

This shows that the far-infrared radiating material covering the base material also works effectively for the purpose of receiving heat. In general,
When a film of some kind is formed on the surface of a base material, considering the thermal conductivity of the object, it is expected that the film will act as a heat insulator, but in reality, it is necessary to provide far-infrared emitting material on both sides of the base material. It has been found that the heat radiation properties and heat dissipation properties can be greatly improved.

In addition, the far-infrared radiation material that covers the base material is known as
For example, various materials such as alumina, magnesia, and zirconia can be used.

Furthermore, the method of coating the surface of the base material with the far-infrared emitting material is not particularly limited; A method such as low-temperature thermal spraying using particles (particle size of about 5 μm) is used.

The following describes the results of investigating the characteristics of far-infrared radiators whose surfaces have been subjected to various treatments.

<Test Example 1> A heat dissipation test was conducted using a test piece that had undergone various treatments on the surface of a flat base material.

Figure 1 shows a schematic diagram of the test equipment. In the figure, 10 is a hollow box formed using a heat insulating material. One through hole 12 is formed in nine stages in the upper part of the box body 10, and the other part of the box body 10 is sealed. The through hole in the test example is.

It is circular with a diameter of 40 mm. A heater 14 is installed inside the box body 10.
Place. In the test example, a 1.2 kW heater was used.

Reference numeral 16 denotes a test specimen placed horizontally above the through hole 12. The test specimen 16 was placed 35 mm apart from the top surface of the through hole 12.

In the heat dissipation test, the temperature of the furnace of the box body is kept constant, and various test specimens 16 are placed above the through hole 12 as described above.
This was done by placing thermocouples at predetermined positions above and below and measuring the temperature of each part over time.

In Figure 1, a, b, c, cl, e, f are thermocouples]
Indicates the position. a is a position 10 mm away from the top surface of the test specimen, b is a position in contact with the top surface of the test specimen 16, C is a position in contact with the bottom surface of the test specimen, d is 10 m from the bottom surface of the test specimen
m is the downward position, e is the position that corresponds to the top surface of the through hole,
f is a position corresponding to the lower surface of the through hole.

In this test example, the test specimen was made of a drawn iron plate (A3), which had been subjected to various treatments on the surface of the base material. The size of the base material is 100mm x JOOmm, )
The width is 0.25 mm. In the test, 19 types of test content were measured. The details of this test are shown below.

In order to show the placement of the test specimen with respect to the heat source, the second side of the base material is A side, and the bottom side of the base material (the side facing the through hole).
is called the B side.

■ Galvanized iron plate. Used without any treatment on both sides.

■ Ni-Cr sprayed on one side only. Place with the sprayed surface facing A side.

■ Same sample as ■, with the sprayed surface on the B side.

■ A 50μm coating of far-infrared emitter (black) is formed on one side only using low-temperature spraying. Place the coating side on the A side.

■ Same sample as ■, with the coating side on the B side.

■ A 50μm coating of far-infrared emitter (gray) is formed on one side only by low-temperature spraying. Place the coating side on the A side.

■ Same sample as ■, with the coating side on the B side.

■ A 50μm film of far-infrared emitter (black) is formed on one side. Place the coating side on the A side.

■ Same sample as ■ with the coating side on the B side.

[Stocks] Same treatment lj sample as ■, 1 return thickness is 100μ
m's. Place the coating side on the A side.

■ Same sample as [Co.] with the coating side on the B side.

@ Same treated sample as ■ with a film thickness of 150 μm.

Place the coating side on the A side.

■　The same sample as o, with the coating side on the B side.

0 Sake is sprayed on one side as a low melting point metal. Place the sprayed surface on the A side.

■ Same sample as 0, with the sprayed surface on the B side.

[Phase] A low melting point metal △[ is thermally sprayed on one side, and a 50 μm film of far-infrared radiator (black) is formed on the other side using a low-temperature spraying method. Place the metal side on the A side.

0 Same sample as sample [phase] with metal surface on side B.

■ Spraying high-melting point metal Ni-Cr on one side, forming a 50 μm coating of far-infrared emitter (black) on the other side using low-temperature spraying,
Place the metal side on the A side.

■ The same sample as the sample [phase] with the metal surface on the B side 6
FIG. 2 shows the measurement results for each of the above test contents.

The vertical axis of the graph shows the temperature, and the horizontal axis shows the elapsed time.The temperatures measured by each thermocouple a to f are shown by the number 1.In this test, the purpose of this test was also to see the change over time, so the samples were changed in order. It was measured.

The numbers (1) to (25) on the graph indicate the 81 fixed order. In addition, measurements (1) to (9) and + (
HI3 constants from 10) to (25) were measured on different days.

These measurement results can be summarized as follows.

(1) Test order No. 2.6.16, data not shown in Z5 were measured on an untreated galvanized iron plate (1) without surface treatment in order to check reproducibility. The measurement results show that the temperature behavior is constant over time;
This shows that external fluctuation factors do not have much influence. It also shows that long-term measurements are not necessary.

(2) When a film of a far-infrared ray emitting material is formed on the surface of a base material, there is no significant heat insulation effect when the film thickness is about 50 μm to 150 μm; For ①, ②, and ③, there is a tendency for the radiation characteristics to improve as the film thickness increases.

(3) When the side with far-infrared radiating material is placed on side A and B
In the case where the far-infrared radiation material is placed on the A side, the heat dissipation characteristics are better.

(4) In both cases of base materials sprayed with metal and coated with far-infrared radiating material, the heat dissipation properties are better when the modified surface is on the A side rather than on the B side. Furthermore, between metals and far-infrared radiating materials such as ceramics, those using far-infrared radiating materials are more effective in dissipating heat.

(Powder) It seems that high melting point metals have better heat dissipation properties than low melting point metals.

(6) The surface area of the radiator has a large effect on radiation efficiency, and the measurement results clearly show a significant difference.

ω When a film is placed on the A side, it seems that the blackness of the film has little relation to the heat dissipation characteristics.

When placed on the B side, it appears that the film with higher blackness has inferior heat dissipation properties.

(8) In this test, the heat dissipation effect was most effective when the coating was formed on both sides of the base material. This is thought to be due to the synergistic effect of both sides of the base material.

Note that although the far-infrared ray emitting material used in this test was a ceramic-based material such as silica, similar trends can be obtained with other materials.

<Test Example 2> The inner and outer walls of the container were treated with a far-infrared radiation material, and a heat radiation test was conducted.

Figure 3 shows a schematic diagram of the test equipment. In the diagram, 18 is 10
0■Slidac connected to the power supply, 20 is the voltmeter, 2
2 is a heater inserted into the container.

The heater used was one with a rating of 1oov-sow. 6 Ceramic felt was placed at the bottom of the container as a heat insulator.
is packed. 26 is a thermocouple for measuring the temperature of the outer surface of the container, and the output of the thermocouple is connected to a recorder 28.

The apparatuses shown in FIGS. 3(a> and ′b) have the same structure except for the containers 30a and 30b used as samples. In FIG. 3(a), the untreated container is used. In Fig. 3(b), the inner and outer walls of the container are treated with far infrared rays.In both cases, aluminum with a thickness of 0.2 mm is used as the base material of the container, and the container size is determined by the outer diameter. The common size is 25mm and the height is 50mm.

FIG. 4 and FIG. 5 show that the container 30 is
The results of measuring the outer surface temperatures of a and 30b are shown. In addition,
For the measurement, the container was placed in an open state in a windless atmosphere, and the temperature was measured simultaneously using the test apparatus shown in FIGS. 3(a) and (g)). The room temperature at the time of measurement was 22''C.

The vertical axis of the graph shows temperature, and the horizontal axis shows elapsed measurement time.

Figure 4 shows that when the voltage applied to the heater 22 is 30V, the fifth
The figure shows a case where the voltage applied to the heater is 40V.

The measurement results in Figures 4(a) and 5(a) are shown in Figure 3(a).
The test equipment shown in Figure 4 (1)) and Figure 5 (
b) is based on the test apparatus shown in FIG. 3(b).

In Figures 4 and 5, there is a difference in container temperature because the voltage applied to the heater is changed, but the container base material coated with far-infrared radiation material has a higher temperature outside the container than the untreated container. It shows a tendency for the surface temperature to become lower. In Figure 4, the test device (a>) is about 2 times smaller than (b).
The temperature has increased by 2°C, and in Fig. 5, the temperature has increased by about 27°C compared to the test device (a).

This measurement result indicates that by subjecting the container to far infrared rays treatment, the heat dissipation of the container can be improved and the outer surface temperature of the container can be lowered.

By applying far infrared rays to the prisoners at 125°C, it was possible to lower the temperature by 24% to 95°C, and at 93°C, it was possible to reduce the temperature by 24% to 71°C.

FIG. 6 shows another example of the test device used in the heat dissipation test, and FIG. 7 shows the measurement results using this test device. The configuration of this test device is the same as the device shown in FIG.
The difference is that 6b is placed in contact with the outer and inner surfaces of the container. The reason why the entire container was filled with ceramic felt was to reduce temperature fluctuations. Note that the test method is the same as in the case of Fig. 3.

Figure 7(a) shows the measurement results using the testing device shown in Figure 6(a), and Figure 7(b) shows the results of measurement using the testing equipment shown in Figure 6(b).
This is a 111 constant result. In the graph, A is the temperature of the outer surface of the container,
B indicates the temperature of the inner surface of the container. The measurement results shown in Figure 7 can be summarized as follows.

As shown in the table above, depending on the temperature conditions, by coating the surface of the base material with a far-infrared radiation material, the
It was found that it is possible to obtain a % improvement in heat dissipation characteristics.

The tests using the test equipment shown in Figures 3 and 6 above were conducted to look at the heat dissipation characteristics while supplying heat from inside the container, and to evaluate the characteristics in an equilibrium state under certain conditions. On the other hand, in order to examine the natural cooling characteristics of the heated object, a test was conducted using the method shown in FIG.

The containers used were made of the same aluminum as in the above test example, and five types of sample containers (1 to 2) shown below were used.

■Nialium base material as is. No treatment.

■: Inner surface is untreated, outer surface is blasted.

■: Far-infrared treatment on both inner and outer surfaces.

■Inner surface treated with far infrared rays, outer surface untreated.

■: Inner surface is untreated, outer surface is far infrared treated.

In order to minimize the temperature fluctuation factors inside the container,
Paraffin heated to a constant temperature and melted was placed in each container, and the temperature change inside the container was measured. 18 cc of each paraffin was placed in a container, and the temperature was measured using a thermocouple 26 placed at a distance of 10 mm from the bottom of the center of the container, and a recorder.

The measurement results are shown in FIGS. 9(1) to (4). The measurements were repeated four times. The vertical axis of the graph is temperature, and the horizontal axis is elapsed time. In the graph, ■ indicates the measured value of room temperature, and ■ to ■ indicate the sequence of data for the sample containers. For example, the results shown in FIG. 9(1) show that the container temperature decreases fastest in the container (■), and the container temperature decreases the slowest in the container (■). In addition, in Fig. 9 (4), C
The part indicated by is the temperature at which paraffin hardens.

From the test results shown in Figure 9, it can be seen that the container ■ whose base material has been treated with far-infrared rays on both its inner and outer surfaces has the best temperature-lowering characteristics, and there is a noticeable difference compared to the untreated container ■. Ta. It was also found that when the surface area of the base material was increased (blasting), the heat dissipation effect was slightly better than that of the untreated base material.

From the above three tests, it was found that heat dissipation characteristics can be improved by about 15% to 20% by subjecting the base material to far infrared rays treatment. In particular, it is effective to perform far-infrared treatment on both surfaces of the base material.

Test Example 3 Various treatments were applied to the inner and outer surfaces of a container made of stainless steel, and water was poured into the container and heated to perform a temperature increase test.

FIG. 10 schematically shows the apparatus used in this test.

In the figure, 32 is a heater section, and 34 is a Nichrome T1 wire built into the heater section. In the test example, a 600W nichrome wire was used. 36 is a net placed on the top surface of the heater part, and 38 is a capacity 8:+. The foregoing 36 is used to set the container away from the two sides of the heater section 32. In the test example, the bottom of the container 38 was placed at a distance of 15 m from the heater section;
It was set to mM. 40 is a thermocouple for determining the water temperature in the container. Container 338 is filled with 100c of water.
c and measurements were taken.

The sample containers used in this temperature increase test are as follows (a) ~
There are 8 types of σ1).

(a) The inner surface is coated with Ni-Cr thermal spraying and the outer surface is coated with far-infrared radiation material.

(b) No treatment on both the inside and outside. Leaves the shiny stainless steel surface intact.

(c) Both the inside and outside surfaces are coated with far-infrared radiation material Δ.

(d) Inside and outside stainless steel surfaces are treated with +1 or more.

(c) Low melting point metal (AI) sprayed on both the inside and outside surfaces.

(f) Ni-Cr thermal spraying on both the inside and outside surfaces.

C) Both the inside and outside are coated with far-infrared emitting material B.

Φ) The inner surface is coated with N+-Cr thermal spraying and the outer surface is coated with far-infrared radiation material B.

FIGS. 11(]) to (4) show the results of a temperature increase test using the sample container described above. Measurements were performed four times at intervals. The horizontal axis of the graph is time and the vertical axis is water temperature, and both the temperature rise and the temperature drop of the water were measured.

Tables 1 and 2 below show the results of the temperature rise time and temperature fall time.

Table 1 Table 2 The units of numerical values in Tables 1 and 2 are minutes.

From the above test results, the following evaluation can be made.

In comparison with container (b) (standard test container), test container (e) in which metal spraying was applied shows almost the same results as container (b). This indicates that at least the provision of a thin metal coating has almost no effect on the rise or fall of water temperature.

In addition, for test containers other than the above test container (+1), 1
The time required to raise the temperature to 00° C. was approximately half that of container (b), which is a significant difference.

No particularly remarkable difference was observed from the temperature drop data1゜〈Test Example 4〉 A water evaporation test was conducted using the apparatus shown in Fig. 12. The apparatus is similar to that shown in FIG. 10 above. In this test, 80 cc of water was placed in a container, heated for 20 minutes, and the weight of the water after heating was measured to measure the amount of evaporation. At the same time, the temperature rise time was also measured.

The container was made of stainless steel as in Test Example 3, and the stainless steel surface was subjected to various treatments to form the test container. The test was conducted at an indoor temperature of 20°C.

The evaporation test results are shown in Table 3. No, 9 and N in the table
o, 10 inner far infrared radiator is painted, N
The far infrared ray emitters 11, 12, 13, 14, and 15 are coated by thermal spraying.

In Table 1, the number of times indicates the number of repeated measurements.

The amount of water evaporation is the amount of water evaporated in the container after heating with a 600W heater for 20 minutes, expressed as a percentage.

The heating time is the time required to raise the temperature from 35°C to 95°C.

Table 3 From this test result, the following evaluation can be made.

(1) In Table 3, except for test container No. 1, all the others had some kind of treatment applied to the surface of the base material.

According to the results shown in Table 3, the test containers No., ] and No.
In test containers other than 1, clear differences can be seen in the amount of water evaporation and heating time.

In other words, when the surface has been subjected to some kind of treatment, the amount of water evaporation is large and the heating time is shortened.

This result shows that, although it is generally expected that a film formed on the surface of a base material acts as a heat insulator, in reality, the increase in surface area and the heating effect of the far-infrared radiating material are greater than the heat insulating effect. .

(2) No. A container with a metal coating formed on the surface of the base material, such as the test container in 3.4, is also effective. Although it is called a metal coating, the thickness of the coating formed here is as thin as about 0.1 mm, so it is thought that the coating does not have much effect on thermal conductivity, and the difference from the No. and I test containers is It is thought that the surface area and blackness of the base material have an effective effect on the heating effect.

(3) In test containers No. 2, the inner and outer surfaces of the stainless steel base material were subjected to +1 treatment to increase the surface area, but there was a clear difference in the heating effect. In this case, it is possible that changes in blackness may have some influence.

(4) Types of surface treatment on test containers include those in which surface treatment is applied only to the inner surface of the container, those in which surface treatment is applied only to the outer surface, and those in which surface treatment is applied to both the inner and outer surfaces. Table 4 below shows the results of organizing the data regarding the amount of water evaporation and the heating time depending on the form of these surface treatments.

Table 4 Both of the treated materials (■) and (■) used as surface treatment materials in Table 4 coated the surface of the base material by low-temperature spraying, but the amount of water evaporation and water rise were lower than that of untreated containers. There are significant differences in temperature time.

Looking at the form of surface treatment, the most effective is when surface treatment is applied to both the inner and outer surfaces, followed by those applied only to the outer surface, and then those applied only to the inner surface. Considering the deep penetration characteristics of far-infrared rays into objects, it is essential to form a film on the inner surface of the container, so it is considered most appropriate to perform surface treatment on both the inner and outer surfaces.

Products that have been treated on both the inside and outside have twice the heating effect as those that are untreated, so they can be expected to have a variety of uses as a basic technology for heating objects. In addition, it can be expected to be effective as a heat dissipation body in the same way as heating.

(5) Among the methods of forming a film on the surface, the following table 5 compares and organizes the method by low-temperature spraying and the method by painting.
become that way.

Table 5 It is also possible.

The above is a case where the amount of water in the container is 80 cc, but the test was similarly conducted under conditions where the amount of water was scaled up to 600 cc. Table 6 shows the test results.

The test containers used were an untreated SO5 container and a base material whose inner and outer surfaces were coated with a far-infrared radiating material.

The test container is larger than the one used in Test Example 3.

Table 6 As can be seen from Table 5, there is not a huge difference in the heating effect between the thermal spray type and the painted type. Therefore, it is thought that comparable effects can be obtained with both methods.

Thermal spray type is preferable when high temperature resistance of 500℃ or higher, resistance to aging, peeling resistance, abrasion resistance, and elution resistance are required; Painted types are sufficient when used in areas or when manufacturing costs are important. In some cases, both may be used in combination. Note that the evaporation amount of water shown in Table 6 is the evaporation amount after heating for 30 minutes using a 600W heater. Moreover, the temperature increase time indicates the time required to raise the temperature from 35°C to 95°C. The number of times is the number of repeated experiments.

The test results shown in Table 6 show the same tendency as the results shown in Table 4, indicating that a significant warming effect can be obtained by treating the inner and outer surfaces of the base material.

Above, the results of examining the heat dissipation characteristics of the far-infrared radiator in Test Example 1 and the heating characteristics of the far-infrared radiator in Test Examples 2 and 3 have been described.

These test results show that a remarkable heating effect can be obtained by coating both the front and back surfaces of the base material with a far-infrared radiator. Furthermore, it was confirmed from the results of Test Example 1 that it had a large heat dissipation effect.

Far-infrared radiators having such good heating and heat dissipation properties can be suitably used in heat exchangers such as boilers, packages, casings, and other items intended for effective heating or heat dissipation. Can be done.

In the above test examples, as examples of coating the surface of the substrate with a far-infrared radiator, a method of thermally spraying a far-infrared ray radiator and a method of painting were cited, but the coating method is not particularly limited.

In the case of heat exchangers such as boilers, piping, etc., a coating method is practical from the viewpoint of workability and economy in providing a film on the surface of the base material. In some cases, it may be possible to use both painting and thermal spraying. In this way, the heating characteristics of boilers and the like can be greatly improved by the simple operation of coating with far-infrared radiating material, so the effects of far-infrared radiating materials can be effectively demonstrated6. As mentioned above, the base material is an extremely thin metal plate (weak at high temperatures) like metal foil, and this base material is coated with a far-infrared emitting material with a high melting point such as alumina, magnesia, or zirconia. In such cases, low-temperature spraying is preferably used. This low-temperature thermal spraying method uses fine powder of far-infrared radiation material (
By using fine powder as the thermal spraying material, thermal spraying can be performed at low temperatures, thereby making it possible to obtain a surface with good surface roughness.

The far-infrared radiator having the metal foil as a base material thus formed has the following characteristics not found in other products.

(1) Since the heat capacity is small, the temperature rises quickly.

Since it is flexible, it is easy to install and can be easily installed on existing parts.

(3) It can be easily cut into pieces using scissors, allowing for greater flexibility in use.

(4) Since it is lightweight, it is advantageous in terms of transportation costs.

In addition, the weight of the plant is reduced and installation is advantageous in terms of construction.

(5) Unlike those coated with W by painting, it has high durability against changes over time and also has high durability in high temperature ranges.

(6) Unlike painted types, it is difficult to elute and has high wear resistance, so it can be suitably used as food-related equipment.

(Effects of the Invention) According to the present invention, as described above, a far-infrared radiator whose heating effect and heat dissipation effect are greatly improved by coating both the front and back surfaces of the base material with a far-infrared radiating material. can be obtained.

This far-infrared radiator can be applied to various types of equipment. For example, if used in heat exchangers such as boilers, the thermal efficiency can be greatly improved compared to conventional ones, and it can also be used in electricity. By using it in the power supply section or casing of equipment, it can be used as a good heat radiator, and other remarkable effects can be achieved.

Although the present invention has been variously explained above, the present invention is not limited to these, and it goes without saying that many modifications can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the heat dissipation test apparatus of Test Example 1. Figure 2 is a graph showing the measurement results, Figures 3, 6, and 8.
The figure is an explanatory diagram showing the heat dissipation test apparatus of Test Example 2.
Figure 8 is a graph showing the measurement results using the test apparatus, Figure 10 is an explanatory diagram showing the temperature increase test apparatus of Test Example 3,
The figure is a graph showing the measurement results, and FIG. 12 is an explanatory diagram showing the evaporation test apparatus of Test Example 4. 14... Heater, 16... Test object, 18... Slydac, 20... Voltmeter, 22... Heater,
24...Ceramicsue/L/l-126,26
a, 26b--Thermocouple, 28... Recorder, 30a
, 30b... Container, 32... Heater section, 36.
...Net, 40...Thermocouple.

Claims (1)

[Scope of Claims] 1. A far-infrared radiator for heating and heat radiation, characterized in that both the front and back surfaces of a base material are coated with a far-infrared radiating material that emits far-infrared rays. 2. The far-infrared radiator for heating and heat radiation according to claim 1, wherein the far-infrared ray radiating material on the surface side is coated with paint. 3. The far-infrared radiator for heating and heat radiation according to claim 1, wherein the base material is formed of metal foil, and a far-infrared ray radiating material is low-temperature sprayed onto the surface of the base material.