JPH0227618A - Manufacture of coaxial multi-flat cable - Google Patents

Abstract

PURPOSE:To enable an end-treatment with ease with a drain-wire not falling out when a sheath is removed, by furnishing a metallic layer on the side in contact with a shielding layer, and a hot-melt resin on the side of an insulated wire, out of drain-wires, melting the resin by heat produced when the sheath is formed, and welding it to the insulated wire. CONSTITUTION:An insulating material such as a high foaming polyethylene, or high foaming polypropylene and the like is used for the insulated layer 13 of an insulated wire 1. For these insulating materials are liable to be slippery against a drain wire 2, the surface of the drain-wire 2 in contact with the insulating wire 1 is provided in advance with such a hot-melt resin 8 as an ethylene vinyl acetate copolymer, an ethylene ethyl acrylate, or Bond-fast, or the like, and the hot-melt resin 8 which is heated and melted by heat at the time of forming the sheath 4 is fused on the insulating wire 1. Consequently, the drain- wire 2 does not fall out at the time of removal of the sheath, and treatment and processing may be carried out with ease.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coaxial multi-flat cable that has recently begun to be used in internal signal transmission paths of computers.

(Conventional technology) The conventional coaxial multi-flat cable is as shown in Figure 3.
The insulated wire l and the drain wire 2 placed next to it are covered with a shield layer 3, and PVC is coated on the outside of this shield layer 3.
A large number of cables 5 provided with sheaths 4 made of (soft polyvinyl chloride) or polyethylene are arranged in parallel in a plane, and are continuously heat-sealed to each other along their longitudinal direction.

In this case, the shield layer 3 may be a metal tape such as a metal braid, a copper tape, or an aluminum tape, or a combination of these metal tapes 10 and a plastic tape as shown in FIG.
A metal-plastic laminate tape 12, specifically an aluminum polyester laminate tape, is used.

This coaxial multi-flat cable has electromagnetic shielding (EMI
: Electric Magnetic Inte
Recently, it has begun to be used for internal signal transmission paths of computers because of its superiority in terms of reference (reference).

When processing the terminal of the flat cable, first, the sheath 4 and the shield layer 3 are removed all at once, and then the insulating layer 13 of the insulated wire 1 is removed to expose the conductor 14 of the insulated wire 1,
The conductor 14 was connected to the connector and either soldered or pressure-welded. In this case, the sheath 4 and the shield layer 3,
The insulating layer 13 is removed by stripping it with a cutter or burning it away with a laser.

(Problems with the conventional technology) In the conventional coaxial multi-flat cable, the insulating layer 13 of the insulated wire 1 is made of porous PTFE (tetrafluoroethylene:
Insulating materials such as polytetrafluoroethylene), extruded highly expanded Teflon, highly expanded polyethylene, and highly expanded polypropylene are used. These insulating materials tend to slip between the silver-plated annealed copper wire used as the drain wire 2, and the drain wire 2 is loose, so the insulated wire 1 and the drain wire 2 are separated from each other as shown in FIGS. If only the shield layer 3 and sheath 4 are used to hold the wire as shown in the figure, the drain wire 2 may also come out when the sheath 4 and shield layer 3 are removed all at once during terminal processing. Moreover, when processing the terminal, the coaxial multi-flat cable 6 is usually cut to a certain length in advance, so the drain wire 2 is pulled out as described above, and the opposite end is retracted into the sheath 4 This caused the problem that terminal processing of that part was impossible.

To solve this problem, the conventional method was to cover the insulated wire 1 and the drain wire 2 with a shield tape on which an adhesive layer was intermittently formed on the inside to prevent the drain wire 2 from coming off during terminal processing. is being carried out. However, in this method, when the sheath 4 and the shield tape are removed all at once, the insulating layer 13 of the insulated wire 1 is also removed together with the shield tape, which is not preferable.

(Objective of the Invention) The present invention provides a manufacturing method capable of obtaining a coaxial multi-flat cable in which the drain wire does not come out when the sheath is removed and which is easy to process at the end.

(Means for Solving the Problems) The method for manufacturing a coaxial multi-flat cable of the present invention covers the outer periphery of an insulated wire 1 and a drain wire 2 placed next to it with a shield layer 3, as shown in FIG. A coaxial multi-flat cable 6 is manufactured by arranging a large number of cables 5 having sheaths 4 on the outside in parallel in a plane, and heat-sealing them to each other intermittently or continuously in the longitudinal direction. In this method, a metal layer 7 is provided on the side of the drain wire 2 that is in contact with the shield layer 3, a hot melt resin 8 is provided on the insulated wire 1, and the resin 8 is applied to the sheath 4.
The wire is heated and melted by the heat generated during forming, and is fused to the insulated wire 1.

(Function of the Invention) In the present invention, the hot melt resin 8 provided on the insulated wire 1 of the drain wire 2 is fused to the insulated wire 1 by heat during forming the sheath 4, so that the drain to the insulated wire 1 is melted. Bonding of the wire 2 becomes easy and reliable.

(Example) Fig. 1 is an explanatory diagram showing an example of a coaxial wire used in the present invention.Normally, an insulating material such as highly foamed polyethylene or highly foamed polypropylene is used for the insulating layer 13 of the insulated wire l. ing. Since these insulating materials easily slip on the drain wire 2, in the present invention, the insulated wire l of the drain wire 2 is
A hot-melt resin 8 such as EVA (ethylene vinyl acetate copolymer), EEA (ethylene ethyl acrylate), or Pond First is provided in advance on the surface in contact with the sheath 4, and the resin 8 is heated and melted by the heat generated during forming of the sheath 4. This is done so that it is fused to the insulated wire l.

It is desirable that the hot melt resin 8 strongly adheres to the insulating material 13 (for example, polyolefin) of the insulated wire 1, but does not strongly adhere to the metal tape 10 of the laminate tape 12. In order to prevent the resin 8 and the tape 10 from adhering, a release agent may be applied between the resin 8 and the tape 10. In this way, when removing the sheath 4 and the shield layer 3 all at once, ,
The shield layer 3 is easily peeled off from the drain wire 2, and the drain wire 2 is not pulled out together with the shield layer 3.

The drain wire 2 in the present invention can be made into various shapes as shown in FIGS. 2a, b, and c.

The drain wire 2 shown in Figure A has a metal layer 7 with a semicircular cross section on the side in contact with the shield layer 3, a hot melt resin 8 with a semicircular cross section on the insulated wire, and is formed in the longitudinal direction of the metal layer 7. The protrusions 7a are fitted into grooves 8a formed in the long direction of the hot melt resin 8, thereby connecting the two.

The drain wire 2 shown in the figure has a metal layer 7 with a semicircular cross section on the side in contact with the shield layer 3, a hot melt resin 8 on the insulated wire 1 side, and a groove 7b formed in the longitudinal direction of the metal layer 7.
Projections 8b formed in the longitudinal direction of the hot melt resin 8
The hot-melt resin 8 has an outer circumferential surface 8C formed in an arc shape along the outer circumferential surface of the insulated wire 1.

The drain wire 2 shown in FIG. In addition, the hot melt resin 8 has an outer peripheral surface 8C formed in an arc shape along the outer peripheral surface of the insulated wire 1.

In the coaxial multi-flat cable shown in FIG. 3, the sheaths 4 of the adjacent cables 5 are heat-sealed over the entire length in the longitudinal direction, but in the coaxial multi-flat cable of the present invention, the sheaths 4 of the adjacent cables 5 are The coaxial multi-flat cable of the sudare type may be heat-sealed intermittently in the longitudinal direction.Incidentally, the sudare-type coaxial multi-flat cable is different from the one shown in Figure 3, which is continuously heat-sealed in the longitudinal direction. Highly flexible.

(Effects of the Invention) The method for manufacturing a coaxial multi-flat cable of the present invention has the following effects.

(2) Adhesion between the drain wire 2 and the insulated wire 1 becomes easy.

■Since the adhesion between the drain wire 2 and the insulated wire 1 is ensured, the drain wire 2 will not come out when peeling the insulation layer at the terminal of the coaxial multi-flat cable, making the processing easier. .

(2) Since the metal layer 7 is provided on the side of the drain wire 2 that is in contact with the shield layer 3, conduction between the metal surface of the shield layer 3 and the drain wire 2 is also ensured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a coaxial line of a coaxial multi-flat cable, Fig. 2 a-C is an explanatory diagram showing different examples of the drain wire in the present invention, and Fig. 3 is an explanatory diagram of a coaxial multi-flat cable. , FIG. 4 is an explanatory diagram showing an example of a coaxial line in the coaxial multi-flat cable of FIG. 3. l is an insulated wire 2 is a drain wire 3 is a shield layer 4 is a sheath 5 is a cable 7 is a metal layer 6 is a coaxial multi-flat cable 8 is a hot melt resin

Claims (1)

[Claims] The outer periphery of the insulated wire 1 and the drain wire 2 placed next to it is covered with a shield layer 3, and a large number of cables 5 each having a sheath 4 provided on the outside thereof are arranged in parallel in a plane and are heat-sealed to each other. In the method for manufacturing a coaxial multi-flat cable 6, a metal layer 7 is provided on the side of the drain wire 2 that is in contact with the shield layer 3, a hot melt resin 8 is provided on the insulated wire 1 side, and the resin 8 is applied to the sheath 4. A method for manufacturing a coaxial multi-flat cable, characterized in that the coaxial multi-flat cable is heated and melted by heat during forming and fused to an insulated wire 1.