JPS5833666Y2 - Electric Kanetsuyo Sheet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrically heated sheet, and is particularly useful for melting snow on roads, bridges, etc.

As an electric heating sheet, heating wires bent in a serpentine shape are used.
It is known that a single-sided adhesive tape and a double-sided adhesive tape with a separator provided on one side are used to bond the above-mentioned adhesive tapes so that their adhesive surfaces face each other to form a sash-like shape (Utility Model Application No. 1983-1999). (See Publication No. 34141).

According to this sheet, the heating wire is adhered to the tape all around the circumference, and these two strips of tape are attached to each other on both sides of the wire, so the wire can be fixed firmly enough and the meandering wire can be fixed as a tape body. When connected in a dangling shape, the meandering heating wires do not move due to their repulsive elastic force, and a satisfactory interdigital heating wire with constant wire spacing can be easily obtained.

However, since the outer surface of the above-mentioned sheet is composed of a slippery smooth tape body consisting of a separator tape and a non-adhesive tape, sheet manufacturing is difficult when winding the sheet around a drum during transport. As a result of slippage, winding becomes difficult and the meandering interval of the heating wire tends to be disturbed.

In addition, in order to wind the sheet so that there is no slippage between the winding layers, a large tightening force is required. In this case, excessive tension is applied to the sheet itself, making it impossible to maintain the heating wire at the specified meandering interval, and also impairing quality. This will have an adverse effect.

In addition, when the above sheet is laid on the road foundation surface,
After the separator tape is removed, the bottom surface of the sheet is adhered to the above-mentioned foundation surface and buried under the pressure of asphalt concrete. Asphalt concrete has the disadvantage that even after hardening, heating wires may adhere to the top surface of the sheet and shift along the longitudinal direction.

Such misalignment not only causes cracks in the asphalt concrete, but also leads to a bad situation in which the heating wires are damaged due to the cracks.

The electrical heating sheet of the present invention can easily eliminate the above-mentioned drawbacks, and has heating wires bent in a serpentine shape with an adhesive coating layer and an asphalt coating layer on both sides of the tape base. Adhere with two strips of flexible tape such that the adhesive coated surfaces of the two strips of flexible tape are facing each other,
It is characterized by a spiral shape.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

Figure 1 is a plan view showing the electric heating sheet of the present invention;
The figure is a sectional view taken along the line a-a in Figure 1, and Figure 3 is a cross-sectional view taken along the line a-a in Figure 1.
FIG. 3 is a detailed view within the dotted frame of the figure.

In the figure, 1 is a heating wire bent in a meandering shape, such as a butyl rubber insulated heat-resistant vinyl sheathed cable, and 2 is two flexible tapes 21 and 22 having the same width that connect the meandering heating wire 1 in a spiral shape. It is a tape concatenation body.

The flexible tapes 21 and 22 are each made of a tape base 211 and 221 preferably made of canvas tape, such as cloth tape, canvas tape, plastic tape, aluminum tape, etc., and a natural rubber adhesive 212, 222 is applied to one side of the tape base 211 and 221, and the other side is preferably made of canvas tape. One side of the flexible tape 21, 22 is coated with or impregnated with rubber-like asphalt (213, 223), and the serpentine heating wire 1 is sandwiched between the flexible tapes 21, 22. The application surfaces 212 and 222 are bonded to each other so as to face each other.

By providing a plurality of tape connectors 2 at predetermined intervals in the meandering direction of the heating wire 1, a spiral electric heating sheet can be obtained.

When installing the above electric heating sheets on roads, bridges, etc., the foundation surfaces of roads and bridges are covered with, for example, asphalt mortar, the electric heating sheets are laid on the mortar layer, and asphalt concrete is placed on top of these. The concrete is then rolled out.

In this case, the upper surface of the tape connector 2, that is, the flexible tape 21
The asphalt-applied surface 213 of is buried in asphalt concrete, but since the materials are of the same type, this interface can adhere extremely well, and there is no risk of mutual displacement.

As mentioned above, the electric heating sheet according to the present invention has two adhesive coating layers and an asphalt coating layer provided on both sides of a tape connection body of heating wires, that is, a tape base in a cylindrical electric heating source.
It is constructed by sandwiching a heating wire between strips of flexible tape and pasting the adhesive-coated surfaces of these flexible tapes to each other. Since these two flexible tapes are attached to each other on both sides of the heating wire, the wire can be fixed firmly enough, and the meandering heating wire can be connected in a spiral shape with the tape connector. At this time, the meandering heating wire does not move due to its repulsive force.

Therefore, a satisfactory cylindrical heating wire with constant wire spacing can be easily obtained.

In addition, the sheet of the present invention has an asphalt coating layer on the opposite side of the two strips of flexible tape that serves as the tape connection body, that is, on the upper and lower outer surfaces of the sheet. Appropriate frictional resistance acts between the layers, effectively preventing the occurrence of layer collapse.

Therefore, unlike conventional sheets, there is no problem that the winding layers slip and the meandering distance of the heating wire cannot be maintained at a predetermined interval, and the winding operation can be done extremely smoothly.

Moreover, even if the sheet of this invention is installed between the road foundation surface (asphalt mortar) and the asphalt concrete that forms the pavement surface, the asphalt coating layer provided on the upper and lower outer surfaces of the sheet is made of the same material, so The interface between the outer surface and the asphalt concrete and the road foundation surface can be tightly adhered to each other, and there is no possibility of interface displacement occurring as in the prior art described above.

Furthermore, the electric heating sheet of the present invention has an asphalt coating layer on both sides of the tape connection body, so there is no directionality and there is an advantage that the installation work can be carried out with high efficiency.

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[Brief explanation of the drawing]

Figure 1 is a plan view showing the electric heating sheet of the present invention;
The figure is a sectional view taken along the line a-a in FIG. 1, and the third figure is a detailed view within the dotted line frame in FIG. 2. In the figure, 1 is a heating wire, 2 is a tape connection body, 21°2
2 is a flexible tape, 211, 221 is a tape base, 21
2° 222 is an adhesive coating layer, and 213 and 223 are asphalt coating layers.

Claims (1)

[Scope of utility model registration request] A heating wire bent in a serpentine shape is provided with an adhesive coating layer and an asphalt coating layer on both sides of the tape base.2
1. A sheet for electric heating, characterized in that the two strips of flexible tape are adhered to each other so that the adhesive-coated surfaces of the two strips face each other, and are twisted in a spiral shape.