JPH0259571B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Background and Objects of the Invention] The present invention relates to an advantageous method for manufacturing a flat cable using a heat-melting fluororesin as an insulator.

Heat-melting fluororesin is useful as an insulator for cables because it has excellent electrical properties as well as mechanical properties, heat resistance, cold resistance, chemical resistance, and other properties.

By the way, conventionally, when manufacturing a heat-melting type fluororesin-insulated flat cable, a plurality of heat-melting type fluororesin insulating cores are arranged in parallel, and heat is applied by pressing them with a trowel from above and below to melt the hot-melting type fluororesin. Glue the
After that, they were cooled and solidified, and then integrated in parallel.

However, in this case, since the heat-melting fluororesin is melted once, the core located on the leftmost or rightmost side escapes laterally in a low viscosity molten state, resulting in the formation of so-called burrs.

For this reason, in the past, one or several cores of the same type, called dummy wires, were attached to the left and right sides and fused together, and after fusion, the dummy wires were removed to neatly shape the sides.

As a result, the dummy wires become wasted, and removal of the dummy wires and shaping after removal also require very advanced and highly precise techniques.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an excellent manufacturing method for multi-core heat-melting fluororesin insulating cores.

[Summary of the invention]

That is, the gist of the present invention is to provide a method of arranging hot-melting fluororesin insulating cores in parallel and integrating the cores by heat fusion, in which the hot-melting fluororesin is attached to at least the side surfaces of the cores at both ends. A method of manufacturing a fluororesin-insulated flat cable is characterized in that heat is applied to the core by pressing it with a trowel from above and below while the core is covered with a heat-resistant film that does not melt at the softening temperature of .

〔Example〕

Next, embodiments of the manufacturing method of the present invention will be further described with reference to the accompanying drawings.

In FIG. 1, numeral 1 denotes heat-melting fluororesin insulating cores, and the required number of cores are arranged in parallel.

Reference numeral 2 denotes a heat-resistant film provided around the outer periphery of the core 1. In this state, it is pressed down with a iron 3 from above and below, and by applying heat to the iron 3, the core 1 is melted and adjacent cores are bonded together.

After this, the cable is cooled and the core is solidified, after which the heat-resistant film is peeled off and the cable is completed.

Here, the core 1 is composed of three conductors and a heat-melting type fluororesin insulator extruded and coated on the outer periphery thereof.

As the conductors, silver-plated oxygen-free copper single wires with a diameter of 0.16 mm are used, and they are arranged in parallel so that the distance between the conductor centers is 0.45 mm.

Of the three conductors, the center conductor is used as a signal line, and the conductors on both sides are used as ground lines.

The heat-melting fluororesin has a thickness of 0.66 mm on the outer circumference of the conductor.
Extrusion coated to a width of 1.27mm. A hot-melt fluororesin is a fluororesin that melts and softens when heated, and specifically includes tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP). , ethylene-tetrafluoroethylene copolymer (ETFE), etc.

The heat-resistant film 2 is made of a material that does not melt at the softening temperature of the heat-melting fluororesin, and specifically includes polyimide film, polytetrafluoroethylene film, aluminum film, etc., and the thickness of the film is 0.03 to 0.1 mm. is appropriate.

The heat-resistant film 2 is not limited to covering the entire cable as in this embodiment, but it also covers at least the sides of the insulating core on both sides as shown in FIGS. Any structure is sufficient as long as it prevents it from escaping laterally even if it melts.

〔Effect of the invention〕

In the method of the present invention, which is constructed as described above, the heat-resistant tape prevents the heat-melting type fluororesin insulating core at the side end from escaping to the side, and therefore does not require a dummy wire and is extremely easy to manufacture. It is a thing,
Its industrial value is enormous.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the manufacturing method of the present invention, and FIGS. 2 to 4 are explanatory diagrams showing other embodiments of the method of the present invention. 1; Heat-melting fluororesin insulating core; 2; Heat-resistant film; 3; Iron.

Claims (1)

[Claims] 1. In a method in which heat-melting fluororesin insulating cores are arranged in parallel and the cores are integrated by heat fusion, at least the side surfaces of the cores at both ends are covered with a heat-resistant film that does not melt at the softening temperature of the heat-melting fluororesin. A method for manufacturing a fluororesin-insulated flat cable, characterized by applying heat by pressing the core from above and below with a trowel.