JPS6010829Y2 - heat shrinkable covering material - Google Patents

Description

[Detailed description of the invention] The present invention is a tube and a sheet made of a heat-recoverable material, in which a heat-generating electric conductor is built into the tube and sheet to generate the heat necessary to cause recovery. In particular, it provides heat-shrinkable tubes and sheets with built-in heating wires that allow easy power supply from commercial power without losing the flexibility of the tubes and sheets, that is, heat-shrinkable covering materials. It is.

The inventors of the present invention have already devised and filed an application for a heat-shrinkable comb or plastic tube or sheet 1, that is, an electrically-conducting material 1, in which an insulated heating wire 2, which becomes a heat source, is installed inside the heat-shrinkable comb or plastic tube or sheet 1 (for example, 53-16154
No. 6).

In this case, the heating wire 2 needs to be wired so as not to interfere with the contraction movement in the main contraction direction S. For example, as shown in FIG. It was normal to have a line.

However, in this arrangement, in order to prevent the elasticity of the folded portion 3 of the conductor 2 from interfering with the contraction of the tube and sheet itself 1, the conductor 2 must necessarily have a small cross-sectional area, for example 0. A relatively thin wire 2, such as one made by twisting seven annealed copper wires of 17 rrInφ, is preferable.

However, if such a thin heating wire is applied to a long or large-diameter heat-shrinkable plastic sheet and tube 1, the resistance value will be too high if the entire length is used as one circuit to supply power, and the commercial 100 to 200 V Since the power supply does not allow sufficient current to flow between both terminals 4, 4, it has been necessary to divide the circuit into a large number of circuits, such as 8 sections and 1 section, and supply power in parallel (see Fig. 2).

However, in this case, it is necessary to connect the power supply cable to a large number of terminals 4 during construction, which is very troublesome for the scale, and tends to result in poor construction due to forgetting to connect, etc.

In addition, attempts have been made to provide lead wires 5 for interconnecting a large number of terminals 4 so that there are only two terminals, but no good results have been obtained.

However, this was mainly due to two reasons.

One of them is, for example, in the case of a tube 1 for coating a large-diameter tube body, such as a diameter of 1500 mm, the current flowing through the entire tube requires a large amount of current, such as 16 to 18 KW.

However, a removable connector (not shown) for passing such a large current has a considerable size and weight.

Furthermore, the lead wires 5 for distributing to each circuit must also be thick.

Therefore, accidents such as disconnection at the connection point between the thin heating wire 2 are likely to occur, and if the side of the connector (mainly the male side) that is attached to the tube and sheet 1 is disposable, the cost will be high.

Second, since the lead wire 5 is relatively thick and rigid, it cannot follow the heat shrinkage of the plastic sheet and tube, so unless special measures are taken for the connection parts, it will interfere with the shrinkage and , the tube and the sheet 1 were connected by a long flexible wire, making it extremely difficult to handle.

The present invention eliminates the above-mentioned drawbacks of the conventional ones, and even though it has a built-in heating electric conductor 2 that causes heat recovery, it does not lose its overall flexibility and can be powered from a commercial power source. Heat-shrinkable tube and sheet 1 with devised wiring arrangement of built-in heating wires so that it can be easily carried out.
It provides:

That is, the present invention divides the heat-generating shrinkable plastic tube and sheet 1 into a plurality of parts along an imaginary line 6 parallel to the shrinking direction S of the heat-generating plastic tube and sheet, as shown in FIG. Within each section 7 thus created, a series of heating wires 2 are arranged so as to be aligned in a direction substantially perpendicular to the heat shrinkage direction S of the tube and sheet;
The end portions of the heating wires 2 are folded back and arranged in a meandering shape so as not to hinder thermal contraction of the tube and sheet.

In this case, a series of lengths of electrical conductors 2 are arranged in such a way that the respective ends of the conductors 2 arranged in each section 7 are pulled out to the same location in the shrinking direction S of the plastic tube and sheet.

That is, the derivation section 8 is provided.

That is, in the present invention, in a heat-shrinkable tube and a sheet 1 having a built-in heating wire 2 as a heat generation source for heat shrinkage, a plurality of tubes and sheets 1 are arranged along an imaginary line 6 parallel to the direction S in which heat shrinkage occurs. The heating wires 2 are divided into sections 7, each of which has a plurality of parallel strips arranged so as to be substantially perpendicular to the imaginary line 6 in each of the adjacent sections, that is, the section 7, and the adjacent section 7. The end portions 8 of the parallel meandering heating wire portions have a parallel serpentine arrangement that prevents the heat contraction from being hindered by the folded portions that connect the strip portions to form a continuous length, that is, the lead-out portions 8. The tube and the sheet 1 are characterized in that they protrude and lead out of the tube and sheet 1 all at once.

In the present invention, by wiring and incorporating heating wires in this manner, the number of terminals 4 is reduced in accordance with the number of sections 7, and the connection work for power supply during construction is facilitated.

Moreover, since the section 7 is in the width direction (the section line 6 is parallel to the shrinkage direction S), the terminal section 8 can be led out all at once as described above, and the connection with the lead wire 2 is easy. , and can reduce wire breakage accidents.

The present invention will be further described below with reference to embodiments.

Example 1 Circumference 510oTIr! In manufacturing the cross-linked polyethylene heat-shrinkable tube (width 600 mm) 1, an insulated electric wire 2 made of 0.10Hnφ x 7 stranded annealed copper wire extruded and coated with cross-linked polyethylene was incorporated as a heating element.

In this case, the wiring of the insulated wire 2 inside the tube was arranged in three sections in the width direction of the tube.

That is, 5rIr! The above-mentioned insulated wire 2 was wired in a meandering manner at It pitch, and two sheets of polyethylene were welded and fixed to make a wire having a length of 510 or M&.

The insulated wires 2 have their lead wires 5 extended out of the film every 42,577,1711 steps (see FIG. 4).

This structure was used as the intermediate layer 9, and heat-shrinkable cross-linked polyethylene films with a thickness of 200 μm were laminated on both sides of this layer to form a laminate with a total thickness of 1.7 m, and the whole was heated at 180°C. The layers were then welded together to form a tube.

This tube 1 was able to be thermally shrunk uniformly and successfully by conducting electricity from the terminal portion 8 led out.

In contrast to the conventional product that supplies power using a lead wire specifically made for this purpose (utility model application pending: Utility Application No. 140413/1989), power is supplied through two sections with a total of 12 connection points. By implementing the idea, we were able to create four terminals.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of a conventional tube and sheet, Fig. 2 is an explanatory diagram showing another example, Fig. 3 is an explanatory diagram of an embodiment of the present invention, and Fig. 4 is an explanatory diagram of an embodiment of the present invention. It is an explanatory diagram showing a part (intermediate layer) of a tube in other examples. 1...Heat-shrinkable tube and sheet, 2...
...Insulated wire, 3...Folded part of wire, 4.
...Terminal, 5...Lead wire, 6...
... Virtual line, 7 ... Division, 8 ... Derivation section, 9 ... Middle layer, S ... Main shrinkage direction.

Claims (1)

[Claims for Utility Model Registration] 1. A heat-shrinkable comb or plastic heat-shrinkable covering material 1 with a built-in heating wire 2 as a heat generation source for heat shrinkage.
, the heat-shrinkable covering material 1 is divided into a plurality of portions 7 by an imaginary line 6 parallel to the direction S in which heat shrinkage occurs; each adjacent portion 7
Insulated wires 2 are arranged in a meandering manner so as to be substantially orthogonal to the imaginary line 6, and the adjacent parallel multiple wire portions are connected to each other to form a continuous length. The folded portions 8 that do not hinder the heat shrinkage of the heat-shrinkable sheathing material have a parallel meandering arrangement, and each end of the parallel meandering heating wire portions collectively protrudes to the outside of the heat-shrinkable sheathing material. A heat-shrinkable covering material characterized by being made of 2. The heat-shrinkable covering material according to claim 1, wherein the heat-shrinkable covering material is a tube body. 3. The heat-shrinkable covering material according to claim 1, wherein the heat-shrinkable covering material is a sheet.