JPH10306404A - Protection sheet for snow-melting or heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To not only protect a heat source part but also improve the strength and durability of a surface course and to effectively utilize far infrared ray radiation energy, in a protection to protect snow-melting or heating equipment to bury a heat source part between a foundation layer and a surface course. SOLUTION: Mixture liquid is prepared by adding a far infrared ray radiation material to petroleum asphalt and heating and mixing them together. By impregnating a base material with the mixture liquid, a protection sheet 10 having both an infrared ray radiation function and thermal fusion properties is produced. The protection sheet 10 is laid on heat source parts 12 and 14 and the heat source parts 12 and 14 are fused and integrally formed between a foundation layer 16 and a surface course 18 and energy from the heat source parts 12 and 14 is radiated as far infrared rays over a wide radiation area through a far infrared ray radiation function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting facility used for preventing snow melting and freezing on roads, sidewalks, parking lots, rooftops, roofs, and the like.
Or for snow melting or heating equipment that has a heat-fusing property that contributes to enhanced protection and durability of the whole equipment in heating facilities such as various facility factories and general houses, and enables effective use of far-infrared radiation energy. Protective sheet.

[0002]

2. Description of the Related Art Several snow melting and heating methods utilizing far-infrared radiant energy have been proposed in the market and are being implemented on an experimental scale.

[0003] For example, in asphalt pavement, a heating wire is laid on a base layer of a road, and a surface layer (protective layer) is placed thereon.
A method of paving asphalt pavement material containing far-infrared radiating material, or forming a far-infrared radiating layer on the surface of asphalt surface layer and radiating conducted heat transfer from a heat source such as a heating wire below the ground or a hot water pipe There is a method of melting snow on the road surface by converting it into energy.

However, in any of these methods,
At present, no great advantage is obtained compared to the conventional snow melting and heating methods using a conduction heat transfer method. In addition, there is often a situation in which the buried heat source is often disconnected or broken due to impact load or vibration from the surface.

[0005]

Theoretically, snow melting or heating equipment utilizing far-infrared radiant energy has a higher temperature or heat rise time on the road surface or floor than that using the conventional conduction heat transfer method. It should be excellent in the spread of snow, etc., and superior snow melting and heating effects should be obtained. Nevertheless, the conventional method described above does not achieve the original effect of using far infrared rays.

The present inventor has proposed a heat diffusion and heat insulating board in Japanese Patent Application No. 9-36691 in order to enable effective use of far-infrared radiation energy. This heat diffusion heat insulating board has a high heat conductive metal plate provided with a far-infrared radiation layer disposed on a high pressure resistant heat insulating plate, and is integrated. Provided
In addition to preventing heat loss downward, the thermal energy of the heating element is rapidly diffused laterally through the highly heat-conductive metal plate, and the far-infrared radiation layer formed on the surface spreads over a wide area to the upper road surface. Enable to emit far infrared rays.

Embedding such a heat diffusion heat insulating board integrally with a heat source is effective in snow melting and heating, but on the other hand, there is a problem that the strength and durability of roads and floors are reduced. .

For example, in a snow melting facility such as a road or a parking lot by asphalt pavement, when a processed high heat conductive metal plate is buried under the road surface, the asphalt pavement and the metal plate are apparently cut by the asphalt pavement. Although it seems that they are integrated inside, the road material is a mixed material of asphalt, sand and crushed stone, so that it is not in close contact with the entire surface of the metal plate and has a weak adhesion. Therefore, the load from the road surface due to the passage of heavy vehicles,
Due to vibration and impact, repeated expansion and contraction due to fluctuations in the road temperature, the metal plate and the road material easily cause delamination, and there is a risk of causing road damage such as cracks.

[0009] Therefore, it is not practical to bury a metal plate processed under a road surface or a floor surface simply to improve the thermal conductivity and obtain a far-infrared radiation effect. It can also be a cause.

In view of the above, the present invention aims to enhance the protection of the entire equipment by protecting the heat source portion and improving the strength and durability of the surface layer such as roads and floors, and at the same time, to reduce the far-infrared radiation energy. It is an object of the present invention to provide a protective sheet for snow melting or heating equipment that can achieve effective utilization.

[0011]

The protective sheet for snow melting or heating equipment according to the present invention is obtained by adding a far-infrared radiating material to petroleum asphalt and mixing the mixture by heating. It has both an infrared radiation function and a heat fusion property.

[0012] The protective sheet of the present invention can be used by laying on the heat source to protect the heat source in snow melting or heating equipment having a heat source buried between the base layer and the surface layer. it can. In such a use, the protection sheet is made of a heat-fusing property of petroleum asphalt to fuse and integrate the heat source portion between the base layer and the surface layer, thereby protecting the heat source portion and improving the strength and durability of the surface layer. Therefore, the protection of the entire equipment can be enhanced. Further, since the far-infrared radiation material is added, the energy from the heat source portion can be radiated as far-infrared rays over a wide radiation area, and the far-infrared radiation energy can be effectively used. In particular, when the heat source itself emits far-infrared rays, the far-infrared rays can be absorbed and re-emitted in a wide area without being attenuated.
Further, since the tensile strength of the protective sheet is increased by the base material, the heat source portion and the surface layer can be protected from the force acting in the shear direction.

[0013] In the protective sheet of the present invention, it is preferable that graphite is added to the mixture. As a result, the thermal conductivity is improved, and the radiation emission of far infrared rays is increased.

In the protective sheet of the present invention, a mixture of petroleum asphalt and far-infrared ray radiating material may be applied on one or both sides to form a multilayer structure. Such a multilayer structure is advantageous in that the fusion strength can be increased without diminishing the propagation of far-infrared radiation, and at the same time the heat conduction and radiation effect can be enhanced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, matters relating to the implementation of the present invention will be described in detail.

As described above, the mixed liquid impregnating the substrate is
It is made by adding a far-infrared radiation material to petroleum asphalt and mixing by heating.

[0017] Petroleum asphalt is used to impart heat fusibility to the protective sheet. Petroleum asphalt is generally classified into straight asphalt and blown asphalt. In the present invention, it is preferable to use semi-blown asphalt modified by blowing light heated air into straight asphalt. This is because semi-blown asphalt has a higher softening point, lower elongation, and higher adhesive strength than straight asphalt due to the above-described modification, and can exhibit excellent properties when used as a protective sheet. . Here, the softening point of semi-blown asphalt is 80.
~ 100 ° C, penetration (25 ° C) is 40 (1 / 10mm)
As described above, the viscosity (180 ° C.) is ²⁰⁰ cSt (mm ² / s).
It is preferable to use the following.

In the case of general roof snow melting, facility floor heating, and the like, the heat-sealing strength may be relatively reduced, and a protective sheet that is not very sticky from the viewpoint of workability may be used. In some cases, a protective sheet that requires a high heat-resistant temperature or a suitable heat insulating property is desired. In such a case, blown asphalt is used as the petroleum asphalt, and one or more kinds of a thermoplastic elastomer such as ethylene-vinyl acetate copolymer (EVA), a modifying agent such as a petroleum resin, a urethane resin, or the like are mixed into a liquid mixture. By blending in an appropriate amount, a protective sheet meeting such a demand can be obtained.

When these modifiers are used, a far-infrared ray radiating material, graphite, or the like is added to the modifier in advance, and the pellet is formed into a shape and size that can be easily dissolved by a kneading extruder. Is mixed with an appropriate amount of molten asphalt such as a heating and stirring tank described below, and the mixture is stirred, whereby a mixed liquid in which the compounded materials are uniformly dispersed can be obtained quickly and easily.

The far-infrared radiation material is added to impart a high far-infrared radiation function to the protective sheet. As the far-infrared radiating material, it is preferable to select a material having a high emissivity of about 10 microns in consideration of the purpose of snow melting / freezing prevention or heating. Preferable examples thereof include fine powder of granite or rhyolite having silica oxide, alumina oxide or the like as a main component, or fly ash (coal ash). In addition, it is desirable to mix an appropriate amount of a metal oxide such as iron oxide, manganese dioxide, and nickel oxide.

The particle size of the far-infrared radiating material is desirably 5 μm or less. If it exceeds 5 μm, the far-infrared radiating material is difficult to be uniformly dispersed in the petroleum asphalt due to a difference in specific gravity when mixed with the liquefied petroleum asphalt, and separated and precipitated from the petroleum asphalt during the production of the protective sheet, and the far-infrared radiating material This is because a sheet in which is dispersed uniformly cannot be obtained. The addition amount of the far-infrared radiating material is preferably 5 to 40 parts by weight based on 100 parts by weight of petroleum asphalt in order to effectively exhibit the far-infrared radiating function.

The mixed solution contains graphite having the highest thermal conductivity among non-metallic solids, for example, having a thermal conductivity of 90 to 12
It is preferable to mix graphite at 0 kcal / mh ° C. The above-mentioned petroleum asphalt has a thermal conductivity of about 0.12 to 0.1 in a normal temperature range (for example, 0 to 70 ° C).
Although it is 5 kcal / mh ° C. and has poor thermal conductivity, the thermal conductivity of the protective sheet is improved by adding graphite, so that the sheet can be more suitable for snow melting and floor heating. It is. In addition, the addition of graphite not only improves the thermal conductivity, but also has a great effect of increasing the radiation emission (w / m ² ) of far infrared rays by improving the temperature rise of the protective sheet surface. Is also advantageous. From the viewpoint of exhibiting such an effect effectively, the compounding amount of graphite is set to 10 as petroleum asphalt.
The amount is preferably 5 to 50 parts by weight with respect to 0 parts by weight.

The protective sheet is obtained by impregnating a base material with the above-mentioned mixed solution. This base material is used to increase the tensile strength of the protective sheet, and particularly plays a role of protecting a road surface, a floor surface, and a heat source portion from a force acting in the shear direction.

As such a substrate, a sheet-like fibrous structure such as a nonwoven fabric, a woven fabric, or a felt can be used.
As the fiber material used for the base material, synthetic fibers are preferable, and among them, it is particularly preferable to use synthetic fibers having high infrared absorption characteristics of about 10 microns, such as polypropylene and vinyl chloride. For example, the polypropylene fiber has a wavelength range where the far-infrared absorption efficiency is low around 7 μm, but the absorption efficiency increases as the wavelength becomes lower than 8 μm. for that reason,
When the present protective sheet is applied to a system in which the heat source radiates far-infrared rays whose maximum wavelength region is about 10 microns, the far-infrared rays can be efficiently absorbed and re-emitted.

The substrate can be appropriately selected according to the use of the protective sheet. For example, protective sheets, roads,
When used for equipment that applies heavy load on the surface layer, such as snow melting in parking lots, harbors, airport facilities, floor heating of various factory facilities, etc., it is formed using a nonwoven fabric, especially the needle punch method. It is preferable to use a bulky nonwoven fabric. On the other hand, in the case of using a facility in which a heavy load is not applied to the surface layer, such as snow melting on a sidewalk or a roof or floor heating in a general facility, it is preferable to use a woven fabric.

The impregnation ratio of the mixed solution to the substrate [(weight of the mixed solution / weight of the substrate) × 100] is not particularly limited, and may be appropriately determined according to the type of the substrate and the use of the protective sheet. Can be set to For example, 700-800% when a bulky nonwoven fabric is used for road snow melting, and 250% when a woven fabric is used for sidewalk snow melting and floor heating.
It is preferably about 300%.

The thickness of the protective sheet is preferably 2 mm or less from the viewpoint of maintaining high infrared radiation intensity. When the thickness of the protective sheet is about 1-2 mm,
It is preferable to use a bulky nonwoven fabric as the substrate. For example, about 2 mm for roads where heavy vehicles pass,
About 1 mm is appropriate for parking lots and various factory facilities. On the other hand, when the thickness of the protective sheet is 1 mm or less, it is preferable to use a woven fabric as the base material.
For example, about 0.5 mm is appropriate for a sidewalk or a roof of a general house.

In the present protective sheet, a mixture of petroleum asphalt and far-infrared radiating material is applied on one or both sides to form a far-infrared radiating layer, whereby the protective sheet has a multilayer structure. It may be formed as. In the case where the protective sheet is required to have a further integrated strength for fusion, the integrated strength can be increased by increasing the thickness of the sheet. The surface temperature of the sheet decreases and the far-infrared radiation effect decreases. In such a case, the multilayer structure is advantageous in that the integrated strength of fusion can be increased without reducing the far-infrared radiation effect. In addition, as the mixture applied to the protective sheet, the above-described mixed solution for impregnating the base material can be used.

In the case of a multi-layer structure as described above, in the mixed solution to be impregnated into the base material, the blending amount of graphite is set to be larger, and the blending amount of the far-infrared radiating material is set to be smaller, so that the heat conductive It is preferable that the mixture to be applied to the sheet surface is mixed with a far-infrared ray radiating material in a larger amount than the mixture. For example, as a mixed solution for impregnating the base material, 5 to 40 parts by weight of a far-infrared ray radiating material and 20 to 40 parts by weight of graphite with respect to 100 parts by weight of petroleum asphalt.
As a mixture to be blended at 50 parts by weight and applied to the sheet surface, it is preferable to blend 20 to 40 parts by weight of a far-infrared ray radiating material and 5 to 20 parts by weight of graphite with respect to 100 parts by weight of petroleum asphalt. Thereby, the surface temperature of the protective sheet increases, and the absolute temperature of the far-infrared ray layer on the protective sheet surface increases. As a result, the degree of radiation of far-infrared radiation is increased, and a better radiation effect is obtained.

The method of impregnating the base material with the mixture is not particularly limited, and various known methods can be used.
When a bulky nonwoven fabric is used as the substrate, it is particularly preferable to carry out the method by the method described below.

As shown in FIG. 2, petroleum asphalt, a far-infrared ray radiating agent and, if necessary, graphite are charged into a heating and stirring tank (50) and homogeneously dispersed and melted to prepare a mixed solution. An appropriate amount of this mixed solution is constantly spouted upward from the bottom in the asphalt immersion tank (54). The mixed liquid (52) spouted from the bottom reaches the upper part while stirring the mixed liquid (52) in the immersion tank (54), and heats and stirs from the surface layer of the immersion tank (54).
It is collected in (50) and circulates between the immersion tank (54) and the heating and stirring tank (50). By the jetting from the bottom, the temperature in the immersion tank (54) is adjusted, the separation and settling of the far-infrared radiating material is prevented, and the mixed liquid easily penetrates into the nonwoven fabric.

On the other hand, the receiving roller (60) at the bottom of the immersion layer (54) is adjusted so that the nonwoven fabric (56) enters perpendicularly to the liquid level via the feed roller (58) above the immersion tank (54). Then, it is immersed in the mixed solution (52) in the immersion tank (54). Non-woven fabric (56)
Since the temperature is lower than the temperature of the mixture (52), an asphalt film is instantaneously and continuously formed on the surface during immersion. Dissolves the film by contact of the high-temperature mixed solution from the circulating liquid flow, and the mixed solution sequentially penetrates into the nonwoven fabric.
Then, the air staying in the nonwoven fabric rises and is exhausted through a vertical gap in the center of the nonwoven fabric, and at the same time, the mixed liquid enters the nonwoven fabric and is filled with impregnation. The nonwoven fabric (56) that has reached the receiving roller (60) at the bottom of the immersion tank (54) is inverted by the receiving roller (60) and lifted upward, and a rotating scraper with a predetermined gap provided on the immersion tank (54). After the excess mixed solution is removed in (62) and the cooling process is sequentially performed (64), it is wound on the release paper (66).

According to this manufacturing method, a uniform protective sheet in which the far-infrared ray radiating material and graphite, which are free of air (bubbles), are uniformly dispersed can be obtained. In addition, the synthetic fiber base material having far-infrared absorption / emission characteristics is maintained without disturbing the base material structure that is uniformly dispersed throughout by this manufacturing method. The effect can be exhibited.

The protective sheet of the present invention is particularly suitable for use in snow melting or heating equipment provided with the above-mentioned heat diffusion and heat insulating board. Here, an example used for such equipment will be described with reference to FIG.

In the figure, (10) shows a protective sheet, (12) shows a heat diffusion heat insulating board, (14) shows a heating element, (16) shows a base layer, and (18) shows a surface layer.

The heat diffusion and heat insulating boards (12) are juxtaposed at predetermined intervals on the base layer (16). The board (12) is made of a heat-resistant heat-resistant material and a metal heat spreader disposed so as to cover almost the entire upper surface of the heat-insulating material. On the upper surface of the heat diffusion plate, a far-infrared radiation layer formed by applying a paint containing a far-infrared radiation material is formed.
A concave groove (13) extending in the longitudinal direction is provided substantially at the center of the upper surface of the heat diffusion and heat insulating board (12), and a heating element (14) is arranged in the concave portion (13).

The protective sheet (10) is laid so as to cover the entire exposed portions of the heating element (14), the heat diffusion heat insulating board (12) and the base layer (16), and the surface layer (18) Are formed.

Here, when the surface layer (18) is formed of asphalt road material, after laying the protective sheet (10), the heated asphalt road material is placed on the protective sheet (10) and paved to cover the road. The whole can be fused and integrated. That is, due to the heat of the asphalt road material during construction, the protective sheet (10) exhibits a fusibility, and the heating element (14) and the heat diffusion insulation board (12) are easily fixed on the base layer (16). At the same time, the base layer (16) and the surface layer (18) can be firmly fused together.

On the other hand, when the surface layer (18) is formed of a surface material such as concrete or mortar, heat fusion with the protective sheet (10) can be performed by using a dedicated primer.

When semi-blown asphalt is used for the protective sheet, the construction is basically the same as the asphalt road material of the asphalt pavement road using straight asphalt, though it is not the same. Therefore, if the asphalt road material temperature at the time of construction is 130 ° C., the protective sheet can be sufficiently and easily fused and integrated in the road according to ordinary construction procedures. Moreover, the quality of semi-blown asphalt is, for example, a penetration (25 ° C.) of 40 (1/10 mm), a softening point of 90 ° C., and an elongation (0 ° C.).
Is 2.0 cm, the quality of petroleum asphalt used for general asphalt pavement, for example, Mitsubishi straight asphalt 60-80 (for fluidization resistance), penetration (25 ° C.) 66 (1/10 mm ), Softening point 47.5
It is superior in thermal properties and elongation as compared with 140 ° C. and elongation (15 ° C.) 140 cm or more. Therefore, when the heat source part is fixed to the surface layer and the base layer by heat fusion with a protective sheet using semi-blown asphalt, heat, impact,
It can be seen that excellent protection from vibration and slippage is obtained.

As described above, in the protective sheet of the present invention, the heat source buried between the base layer and the surface layer can be fused and integrated between the base layer and the surface layer. In addition, when a heat source having a large far-infrared radiation area is used, the far-infrared radiated from the heat source is absorbed in the entire area, and far-infrared rays are re-emitted with a large radiation area on the surface of the surface layer. Can be. That is, it is possible to prevent the attenuation of the far-infrared rays emitted from the heat source portion and to use the effective far-infrared energy, and to reinforce the entire road to enhance the protection of snow melting or heating equipment.

Further, by blending graphite into the petroleum asphalt constituting the protective sheet, the problem of thermal conductivity of the petroleum asphalt can be improved, and more favorable snow melting and melting can be achieved.
A protective sheet for floor heating can be obtained. This means that petroleum asphalt, a general-purpose material that is extremely easy to use, can be effectively used in terms of both heat fusion and workability.

Conventionally, asphalt sheet-like materials include, for example, asphalt roofing used for waterproofing on roofs and roofs, and impermeable sheets used for drainage treatment ponds and dams. is there. However, the manufacturing methods and specifications of these sheets are developed with emphasis on waterproofness and their durability, far-infrared absorption and re-radiation effects,
No consideration is given to the thermal conductivity or the workability of the road embedding method, the effect of its use, and the like, and therefore, the properties are completely different from those of the protective sheet of the present invention.

[0044]

EXAMPLE 1 A non-woven fabric (200 g / m ² , thickness 1.8 to 2.0 mm) by a needle punch method (120 times / cm ² ) using 8-denier polypropylene long fiber was used as a base material. . As a mixture, a softening point of 90 ° C. and a penetration of 40 (25
℃) 100 parts by weight of semi-blown asphalt
Silica SiO ₂ , alumina Al ₂ O ₃ , iron oxide Fe ₂ O
20 parts by weight of a far-infrared radiating material fine powder appropriately mixed with ₃ and manganese dioxide MnO ₂ , and a thermal conductivity of 120 kc
A product obtained by adding 30 parts by weight of graphite fine powder at al / mh ° C. and mixing by heating was used.

The impregnation of the base material with the mixed solution was carried out by the method shown in FIG. The temperature of the mixed solution was set to about 155 ° C. for the melting temperature of the heating and stirring tank (50), and to about 150 ° C. for the temperature at the time of blowing to the bottom of the immersion tank (54). The temperature was adjusted to about 145 ° C, and the temperature in the upper layer of the dipping tank (54) was adjusted to about 140 ° C. The gap between the rotary scrapers (62) was 2 mm. Thus, a protective sheet having a thickness of 2 mm was obtained.

Comparative Example 1 A sheet was prepared in the same manner as in Example 1 except that the far-infrared ray radiating material and graphite were not added to the mixture.

Test Example 1 A comparative test of the heat conduction characteristics of the sheets of Example 1 and Comparative Example 1 was performed. The dimensions of the sheets were both 230 mm in width × 200 mm in length.

As shown in FIG. 3, a mortar base layer (thickness: 50 mm) (16) is formed in a heat insulating frame (30), and P
TC planar electric heater (size 230 × 700 × t3m
m, voltage 200V, power consumption 70W / m (20 ° C))
The sheet (A) of Example 1 and the sheet (B) of Comparative Example 1 were further placed on the heater (32), and buried with a mortar surface layer (thickness: 30 mm) (18). .

This was put in an atmosphere of 0 ° C., and the surface of the surface layer was kept wet, and the temperature of the surface layer above each sheet was measured. Here, the temperature measurement point (a) was set at a position corresponding to substantially the center of each sheet on the surface of the surface layer. The temperature at the start of the test was 7.7 ° C. for Example 1 and 6.7 ° C. for Comparative Example 1.
Met. The heating temperature of the heater (32) was not controlled, but was controlled by a self-temperature control function.

After 60 minutes from the start of energization, the temperature of the surface of the surface layer (18) on the sheet A of Example 1 was 26.0 ° C., while the temperature of the surface of the surface layer (18) on the sheet B of Comparative Example 1 was 1
The temperature reached 5.2 ° C. That is, in the first embodiment, the energization start 6
After 1 minute, the temperature rose by 18.3 ° C., but only 8.5 ° C. in Comparative Example 1, which was manufactured using a commercially available waterproof sheet specification.

From these results, it has been clarified that the protective sheet according to the present invention has completely different characteristics from the conventional water-blocking sheet, and has a superior difference in thermal conductivity and far-infrared radiation effect. There is no heat-fusible protective sheet having such far-infrared radiation characteristics and heat conduction effect in the current market.

Test Example 2 In order to show the effect when the protective sheet of Example 1 was applied to a snow melting device for roads, an experimental road sample incorporating the snow melting device was used as an asphalt pavement outline (for a cold region specification 13).
F).

The sample has the structure shown in FIG. The base layer (16) is formed of coarse-grained ascon and has a thickness of 65 m.
m. The heat diffusion insulation board (12) has a width of 100 mm x a length of 800 mm x a thickness of 10 mm and a center feed of 150 m.
2 m were laid and fixed. PTC as the heating element (14)
A tape heater (voltage 200 V, power consumption 65 W / m (during snow melting), width 12 mm × length 610 mm × thickness 6 mm) was used. As the surface layer (18), dense-grain ascon 13F (containing far-infrared radiation material) was formed to a thickness of 75 mm. In addition,
The heat diffusion insulation board (12) has a high pressure resistance (16 kg / c
An m ² ) heat-insulating plate (thickness 10 mm) was mounted with an aluminum plate (thickness 0.5 mm) having a far-infrared radiation layer. In addition, the heat insulation process was performed around the sample.

This sample was put in an atmosphere of −20 ° C., and the change in the surface temperature of the surface layer (18) was measured. The surface temperature was the average value of the intermediate position between the two heating elements (14) (measurement point b) and the position directly above the heating element (14) (measurement point c). FIG. 4 shows the temperature change.

For comparison, the heat diffusion insulation board (1
2) and two heating elements (1
4) Only the surface layer (1) is buried under the same conditions.
The change of the surface temperature of 8) was measured. The temperature change is shown in FIG.

As shown in FIG. 4, in the sample using the protective sheet of Example 1, the surface temperature at the start of energization was -4.3.
The temperature rose from 0 ° C to + 0.36 ° C after 60 minutes.
After 120 minutes, the surface temperature had risen to + 3.5 ° C. On the other hand, in Comparative Example 2, the surface temperature at the start of energization of -4.4 ° C. required about 110 minutes to exceed 0 ° C., and only increased to + 0.5 ° C. after 120 minutes. .

Test Example 3 A sample using the protective sheet of Example 1 prepared in Test Example 2 was thrown in an atmosphere of -10 ° C., and the surface layer 60 minutes after the start of energization under the condition of no artificial snowfall. (18) The surface temperature distribution was measured. In addition, the temperature distribution on the surface (18) surface was measured 120 minutes after the start of energization under the condition of snowfall due to artificial snowfall. Table 1 shows the results. In this case, the temperature distribution of Comparative Example 2 used in Test Example 2 was measured under the same conditions.

[0058]

[Table 1] As shown in Table 1, the sample using the protective sheet of Example 1 measured points (b) and (c) both 60 minutes (without snowfall) and 120 minutes (with snowfall) after energization. ) And the temperature distribution was uniform.
In contrast, in Comparative Example 2, 60 minutes after energization (no snowfall)
At 120 and 120 minutes (with snowfall), there was a large temperature difference between the measurement points (b) and (c), and the temperature distribution was uneven.

From the above Test Examples 2 and 3, in the sample using the protective sheet of Example 1, far infrared rays having a maximum wavelength of about 10 microns radiated from the heat source section were efficiently applied to the entire surface by the protective sheet. It is understood that absorption and re-emission are performed, and as a result, a temperature rising rate and a temperature distribution which are not available in the conventional heat conduction type snow melting method are obtained.

Test Example 4 Using the protective sheet of Example 1, a test piece for heating the floor of a facility was prepared, and an indoor temperature rise test was conducted.

As shown in FIG. 5, the specimen had a thickness of 80%.
On a mortar base layer (16 mm), a heat diffusion heat insulating board (12) having a thickness of 10 mm is placed, and a heat storage type heat generating device (34) is inserted into a concave portion of the heat diffusion heat insulating board (12) to form a protective sheet (10). 50m thick with far infrared ray radiating material
m of the mortar surface layer (18) was formed. The regenerative heat generating device (34) is a PT having a heat storage agent in which polyethylene glycol is sealed as a heat storage agent in a pipe having a diameter of 27 mm and a length of 800 mm.
C tape heater (voltage 200V, electricity consumption 85W / m
(-5 ° C), width 12mm x length 610mm x thickness 5m
m).

When energization was started at a floor temperature of 18 ° C. and an indoor temperature of 17 ° C., the floor surface temperature was measured.
It was 26 ° C. at 0 minutes and 32 ° C. at 60 minutes, which proved to be sufficient for floor heating.

[0063]

According to the protective sheet of the present invention, the far-infrared radiation function enables effective utilization of far-infrared radiation energy. At the same time, due to its heat-fusibility and tensile strength, the strength and durability against load, impact, vibration, and slip applied to the heat source part should be increased, and the strength and durability of the road surface or floor in snow melting or heating equipment should be improved. Can be. In addition, the fusion and integration of the protective sheet and the heat source unit enhances the effect of conduction and heat transfer between the entire heat source unit and the surface layer, further enhances the radiation effect, and can increase the efficiency of the entire energy.

[Brief description of the drawings]

FIG. 1 is a sectional view of equipment showing an example in which a protective sheet of the present invention is used for snow melting or heating equipment.

FIG. 2 is a schematic view of a process showing that a base material is impregnated with a mixed solution in a protective sheet according to an embodiment of the present invention.

FIG. 3 is a view showing a specimen in Test Example 1,
(A) is a longitudinal sectional view, (b) is a horizontal sectional view.

FIG. 4 is a graph showing a temperature change of a sample in Test Example 2.

FIG. 5 is a longitudinal sectional view of a sample in Test Example 4.

[Explanation of symbols]

 (10) Protection sheet (12) Thermal diffusion insulation board (14) Heating element (16) Base layer (18) Surface layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Sabuno 2-20-9 Horinouchi, Suginami-ku, Tokyo (72) Inventor Mitsuwa Ogawa 2-4-13-308 Midorioka, Ikeda-shi, Osaka

Claims (4)

[Claims] 1. A method for snow melting or heating equipment having both a far-infrared radiation function and a heat-fusing property, wherein a mixture obtained by adding a far-infrared radiation material to petroleum asphalt and mixing by heating is impregnated into a base material. Protection sheet. 2. The protective sheet according to claim 1, wherein graphite is blended in the mixed solution. 3. A protective sheet for snow melting or heating equipment, which has a multilayer structure in which a mixture of petroleum asphalt and far-infrared radiating material is applied to one or both surfaces of the protective sheet according to claim 1. . 4. In a snow melting or heating facility in which the protective sheet according to any one of claims 1 to 3 has a heat source section buried between a base layer and a surface layer, the protective sheet protects the heat source section. A protective sheet for snow melting or heating equipment, which is laid on the heat source part.