JPH046786A - Electric heating mat buried in mortar - Google Patents

Abstract

PURPOSE:To prevent defective insulation and secure uniform temperature distribution by constituting and electric heating mat with a cable heater consisting of inner layer and outer layer insulators arranged in zigzag at the preset width and formed on the outer periphery of a heating wire and a deposition sheet deposited and fixed to it. CONSTITUTION:A cable heater 4 is arranged in zigzag at the preset pitch and width, and lead wires 9 are waterproofingly connected with connecting terminal 10 at both ends. The cable heater 4 is constituted of an inner layer insulator 2 coated with vinyl chloride or polychloroprene rubber on the outer periphery of a heating wire 1 and an outer layer insulator 3 coated with vinyl chloride thicker than the insulator 2 on its outer periphery. A deposition sheet 5, which has multiple through holes 6 and is constituted of a deposition layer 7 made of polyolefin and polyester deposited by heating and pressing at the linear portion except the folded section of the cable heater 4 in zigzag and a substrate 8 stuck in advance, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric heating mat buried in mortar that is buried in mortar and used for floor heating or snow melting.

Conventional technology In recent years, underfloor heating, which is superior in terms of comfort and health, has become popular in kindergartens,
They are becoming popular in public facilities such as nursing homes and hospitals, as well as in general housing. There are two types of floor heating: hot water type and electric type. However, if the floor structure is made of concrete mortar, it is not possible to repair water leaks using hot water mats, so electric heating mats are widely used.

Conventionally, this type of electric heating mat embedded in mortar consists of meandering heating wires sandwiched between two thermoplastic synthetic resin sheets, and the sheet, heating wires, and the entire contact surface between the sheets being fixed and integrated. There have been proposals in Japanese Utility Model Publication No. 37-18989, and in Japanese Utility Model Publication No. 1-10876, in which a meandering heating cable is adhesively fixed to its original state with a connecting tape.

Problems to be Solved by the Invention However, although the electric heating mat proposed in Japanese Utility Model Publication No. 37-18989 has good workability, it has the following problems.

(1) In order to prevent the heating wire from shifting in its meandering shape, it is necessary to knit the heating wire into its original shape with thread or string in advance.

Processing is complicated and takes a lot of time.

(2) In addition, since two sheets are heated to form a mat that is integrally molded, it is not possible to mold the mat with sturdy heating wires made of thick insulation, and the stress during construction is likely to cause insulation failure.

(3) Furthermore, since this electric heating mat divides the mortar along the sheet, the mortar is likely to crack due to heat or mechanical stress.

On the other hand, since the electric heating mat proposed in Japanese Utility Model Publication Nos. 1 to 10876 is integrated with mortar, there is no fear that the mortar will crack due to heat or mechanical stress, but on the other hand, it has the following problems.

(1) Since the cable heaters, which are strong and stiff, are partially adhesively fixed to their original state using connecting tape, it is not possible to maintain a constant interval between the meandering arrangement of the cable heaters. Therefore, during construction, the connecting tape must be temporarily fixed to the concrete mortar below so that the meandering arrangement interval is constant, which requires a lot of effort.

(2) In addition, the meandering diffraction part of the cable heater cannot be temporarily fixed, and there is a risk that the cable heaters may come close to each other or overlap, which may cause discomfort due to local overheating when electricity is applied, or the durability of the heater may deteriorate. decreases.

Means for Solving the Problems The present invention has the following configuration in order to solve the problems. That is, the electric heating mat according to the present invention is a cable heater that is arranged in a meandering manner with a predetermined width and is made up of an inner layer insulator formed sequentially around the outer periphery of a heating wire, and an outer layer insulator made of vinyl chloride that is thicker than the inner layer insulator. A welding layer made of a composition of polyolefin and polyester is welded and fixed to the straight portion of the cable heater excluding the meandering diffraction portion, and a base fabric is pasted to this welding layer in advance, and a plurality of through holes are provided. It consists of a welding sheet.

In addition, the electric heating mat according to the present invention has a cable heater which is arranged in a meandering manner with a predetermined width, and is composed of an inner layer insulator sequentially formed around the outer periphery of the heating wire and an outer layer insulator made of vinyl chloride which is thicker than the inner layer insulator. In this electric heating mat for embedding in mortar, in which a welding sheet with a plurality of through holes is placed on the upper surface of the cable heater and welded and fixed by heat-pressing, the welding sheet has a softening point lower than the softening point of the outer layer insulator of the cable heater. , and is composed of a welding layer made of a polyolefin and polyester copolymer and having a melting point of 100 to 150°C, and a base fabric pasted on the welding layer in advance, and a straight line excluding the meandering diffraction part of the cable heater. The welding layer and the outer layer insulator are welded and fixed at a portion.

Function The electric heating mat for embedding in mortar of the present invention is configured as described above, so that the meandering arrangement and fixation of the cable heater can be kept reasonably constant, insulation failure is less likely to occur even under stress during burying, and the mat is integrated with the mortar. This ensures uniform temperature distribution.

Example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the electric heating mat for embedding in mortar according to the present invention. 4 is a cable heater which is arranged in a meandering manner at a predetermined pitch and width, and has lead wires 9 waterproofly connected to connection terminals IO at both ends; 5 is provided with a plurality of through holes 6, and is located in the width direction of the cable heater 4. This is a welded sheet that is welded and fixed by heat and pressure bonding in the straight part excluding the meandering diffraction part. The cable heater 4 has an inner layer insulator 2 made of vinyl chloride, chloroprene rubber, etc. coated with a thickness of 0.8 to 1 and 2a+m around the outer circumference of the heating wire 1, and a 1.2 mm inner layer insulator 2 on the outer circumference of the inner layer insulator 2. It consists of an outer layer insulator 3 coated with a thickness of ~1.8 mm. In addition, welding sheet 5
is a composition consisting of a polyolefin and polyester copolymer laminated in advance on a thin non-woven fabric 8 with strong tensile strength, and has a composition of 100 to 15
The welding layer 7 is made of a welding layer 7 having a melting point of 0° C., and the welding layer 7 is placed on the cable heater 4 which is arranged in a meandering manner on the wiring board and is heat-pressed from the base fabric 8 side. It serves to weld and fix the cable heater 4 to the outer layer insulator 3 of the cable heater 4 in a meandering manner in a predetermined pattern.

Figure 3 shows the welding sheet 5 between the cable heaters 4 and the electric heating mat for embedding in mortar according to the construction site at the time of construction.
This figure shows the state in which the image is cut at the A-B portion and then set upside down.

Next, the operation of the above configuration will be explained.

The electric heating mat for embedding in mortar of the present invention has an inner layer having a thickness of 0.8 to 1.2++++++ around the outer periphery of the heating wire 1 as a heating element. It has a double insulation structure consisting of an edge body 2 and an outer layer insulator 3 made of vinyl chloride with a thickness of 1.2 to 1 and 8 nI11 thicker than the inner layer insulator 2. The reason for this is that when an electric heating mat is placed in mortar, a robust structure is required to prevent the insulation from being damaged and insulation deteriorated even if severe mechanical stress is applied, depending on the construction environment and construction method. This is due to the fact that legal electrical equipment standards must be met for this type of construction. The reasons for using vinyl chloride for the outer layer insulator 3 are that the M edge can be easily molded and a uniform thickness can be obtained, that it is unlikely to be damaged by stress during construction, and that it is regulated by electrical equipment standards. etc.

Next, the reason why the welding sheet 5 is configured such that the welding layer 7 made of a polyolefin and polyester copolymer is attached to the base fabric 8 is as follows.

First, the reason why the composition of polyolefin and polyester copolymer was selected for the welding layer 7 is to maintain the meandering cable heater 4 in a predetermined pattern.

It has the property of being able to be welded to the outer layer insulator 3 made of vinyl chloride. Specifically, the polyolefin is a copolymer of polyethylene having a melting point of 100 to 128°C and a polyester copolymer having a melting point of 100 to 150°C, such as terephthal fil and 4-butadiol, and the appropriate mixing ratio is The component of the polyester copolymer is 10 to 50% by weight.

Here, the polyester copolymer component exhibits a function of adhering to vinyl chloride of the outer layer insulator 3 by heat-pressing.

However, since the melt viscosity of the polyester component alone is too low, a thin and uniform film cannot be formed, and the resulting film also lacks mechanical strength.

Therefore, a polyethylene component is added to provide the welding layer 7 with functions to ensure processability and strength when forming a film. The functions of the base fabric 8 are to hold the sturdy cable heater 4 in a predetermined pattern and to ensure mechanical strength during processing and construction of the electric heating mat.

In addition, since the softening point temperature of the welding layer 7 is lower than that of the outer insulating layer 3, the welding layer 7 exerts its adhesion function even during heat compression bonding at 120 to 180°C before the outer insulating layer 3 is thermally deformed. , the cable heater 4 can be firmly held on the welding sheet 5. Further, the reason why the melting point of the welding layer 7 is limited to 100 to 150°C is as follows.

That is, if the composition has a melting point of 100°C or higher, the welding strength for fixing the cable heater 4 to the welding sheet 5 can be ensured, whereas if the melting point is 150°C or lower, the outer layer insulation of vinyl chloride of the cable heater 4 can be secured. This is because the body 3 can be welded and fixed without being deformed during thermocompression bonding.

Next, the reason why the welding sheet 5 is welded and fixed to the straight portion of the cable heater 4 excluding the meandering diffraction portion is as follows.

The meandering diffraction portion of the cable heater 4 is strong and stiff, and stress tends to remain there. Therefore, if the diffraction part is not fixed to the welding sheet 5, the cable heater 4 can be prevented from coming off the welding sheet 5, and as shown in FIG. 3, the welding sheet 5 can be easily cut to suit the construction site. You can change the direction and make cents.

Furthermore, by providing the through hole 6 in the welding sheet 5,
When the electric heating mat is buried in mortar, it can be integrated with the mortar through the through hole 6, so that even if heat or mechanical stress is applied during use, the mortar is unlikely to crack. Furthermore, if the welding sheet 5 is lightly temporarily fixed in several places during construction, the cable heater 4 can be buried in a predetermined pattern and thickness without variation due to the action of the welding sheet 5 and the weight of the mortar at the time of burying.

Effects of the Invention As detailed above, the electric heating mat for embedding in mortar of the present invention can be expected to have the following effects.

Its industrial effects are significant.

(1) Efforts during processing and installation of the electric heating mat can be saved, and uniform temperature distribution can be obtained since variations in installation can be reduced.

(2) Even if welded and fixed by thermocompression during processing, no thermal deformation of the insulator occurs, and it is resistant to stress during installation, so high electrical insulation performance can be ensured.

(3) Since the electric heating mat and mortar can be integrated,
It can withstand heat and mechanical stress during use and has excellent durability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electric heating mat for embedding in mortar according to the present invention;
FIG. 2 is an enlarged perspective view of the main part of FIG. FIG. 3 is a plan view showing an embodiment of the electric heating mat of the present invention when it is in use. 1. Heat generation line. 3... Outer layer insulator. 5... Welding sheet, 7... Welding layer.

Claims (1)

[Claims] 1. An inner layer insulator (2) arranged in a meandering manner with a predetermined width and sequentially formed around the outer periphery of the heating wire (1);
) A cable heater (4) consisting of a thicker vinyl chloride outer layer insulator (3), and a welding consisting of a composition of polyolefin and polyester fixed by welding to the straight part of the cable heater (4) excluding the meandering diffraction part. It is characterized by being composed of a layer (7) and a welding sheet (5) consisting of a base fabric (8) pasted on the welding layer (7) in advance and provided with a plurality of through holes (6). Electric heating mat for burial in mortar. 2. Inner layer insulator (
2) and an outer layer insulator (3) made of vinyl chloride that is thicker than the inner layer insulator (2). In an electric heating mat for embedding in mortar, in which a welding sheet (5) provided with a through hole (6) is placed and welded and fixed by heat pressure bonding, the welding sheet (5) is attached to the outer layer insulation of the cable heater (4). A welding layer (7) which is lower than the softening point of the body (3) and is made of a polyolefin and polyester copolymer and has a melting point of 100 to 150°C, and a base fabric ( pasted in advance to this welding layer (7)) 8), and a mortar characterized in that the welding layer (7) and the outer layer insulator (3) are welded and fixed in the straight portion of the cable heater (4) excluding the meandering diffraction portion. Electric heating mat for burial.