JPS5810802B2 - Method for manufacturing heat-fused wire - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a thermally bonded wire.

2. Description of the Related Art Ribbon wires, in which a large number of insulated wire cores are arranged in parallel and integrated, are often used for internal wiring of electrical and electronic devices.

Conventional methods for manufacturing this type of electric wire include integrating the insulated wire cores with adhesive or by extrusion molding, but in the case of plastic insulated wire cores, plastic has the property of melting due to heat. A method of integrating the materials using methods such as direct heating or high-frequency induction heating is often used.

However, in this case, the entire insulator melts to the inside, so
It had the disadvantage of causing irregular deformation and making it difficult to maintain precise line pitch.

This is inappropriate in cases where precision of the pitch between lines is required, such as in circuit wiring that requires predetermined transmission characteristics.

In view of the following points, the present invention has been made with the aim of providing a heat-sealable electric wire with a precise pitch between the wires. Then, the outer periphery of the same type of non-crosslinkable plastic is extruded and coated so that both layers are fused together, and then a plurality of insulated wire cores made by irradiation with radiation are arranged in parallel and heat fused. A method of manufacturing a heat-fused electric wire is provided.

That is, the present invention maintains a precise pitch between wires by using cross-linked plastic that does not melt as an insulator, and also melts and integrates adjacent wire cores by using the same type of non-cross-linked plastic provided around the outer periphery of the cross-linked plastic. It is what was done.

Generally, when producing an insulated wire core with a two-layer structure of cross-linked plastic and non-cross-linked plastic, the outer periphery of the conductor is first coated with radiation cross-linkable plastic by extrusion, cross-linked by electron beam irradiation, and then ordinary plastic It is conceivable to apply extrusion coating to form a non-crosslinked plastic layer.

However, in this case, the adhesion between the crosslinked plastic layer and the non-crosslinked plastic layer is poor, and there is a high risk of peeling, so that it cannot be used as an insulated wire core for heat-fused wire.

The present invention aims to improve this point. First, a vinyl chloride mixture mixed with an appropriate amount of a polyfunctional monomer or a radiation-sensitive crosslinking substance is applied to the outer periphery of the conductor, and then a vinyl chloride mixture is added to the outer periphery of the conductor. , layers of a vinyl chloride admixture that do not contain the same type of crosslinking material are extruded at a high temperature that allows both layers to fuse.

Extrusion of the vinyl chloride mixture may be carried out in two stages or simultaneous extrusion, but when considering the fusion properties of both layers,
Coextrusion is preferred.

The same type of vinyl chloride mixture is used in consideration of fusion properties.

The vinyl chloride mixture that does not contain a crosslinking substance may be thin enough as long as it has a thickness that allows it to be fused to an adjacent wire core.

Next, this insulated wire core is irradiated with radiation of 0.5 to 10 Mrad, and only the inner vinyl chloride layer undergoes a crosslinking reaction and is crosslinked.

This inner crosslinked vinyl chloride layer acts as an insulator.

A large number of insulated wire cores obtained in this way are arranged in parallel, and when heated by external heating, etc., the internal crosslinked vinyl layer does not melt, but only the outer vinyl layer melts, and the distance between each wire core is adjusted appropriately. When pressed with a suitable jig, mutual heat fusion occurs and a predetermined heat fusion bonded wire with no disturbance in the pitch between the wires can be obtained.

As explained above, according to the method of the present invention, it is possible to provide a heat-sealed wire with excellent dimensional accuracy of the pitch between the wires, and its industrial value is great.

Claims (1)

[Claims] 1 Radiation-crosslinkable plastic on the outer periphery of the conductor and
Furthermore, after extrusion coating the outer periphery of the same type of non-crosslinkable plastic so that both layers are fused together, a plurality of insulated wire cores made by irradiation with radiation are arranged in parallel and heat fused. A method for manufacturing a heat-fused electric wire, characterized by: