JPH01209603A - cable - Google Patents

Abstract

PURPOSE:To improve durability to vibration, an inflexion movement and oil by forming a sheath while having an ethylene vinyl acetate copolymer having the specified contents of vinyl acetate as a main component, and bridging this with an electron beam. CONSTITUTION:In a cable, plural pieces of insulating wires 1, in which an insulating layer (b) is formed outside a core (a) made of a conductive substance such as copper, are focused to be made into a cable core 2, this core 2 is intertwisted with a cotton yarn interposition 6 which is interposed as occasion demands, to be made into a multicore twist insulating electric wire 7 and, for example, a plastic tape and a paper tape 3 are spirally wound about the outside of the insulating electric wire 7 for forming a press-wound layer 4. And, the cable has a construction, in which the outside of it is coated with a sheath 5 of a resin composite, wherein 100wt.% of a ethylene vinyl acetate copolymer containing 10 to 22% of vinyl acetate is combined with 1wt.% of oxydation inhibitor. Further, sheath 5 is given bridging treatment by radiation. Thereby, sufficient durability to vibration and an inflexion movement in the range from low temperature to high temperature and sufficient oil-proofness can be obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to cables such as automobile cables and robot cables, which are covered with a sheath mainly made of ethylene-vinyl acetate copolymer. (ethylene-vinyl acetate copolymer coated wire), more specifically, the wire ranges from low temperature (e.g. -30°C) to high temperature (e.g. +1
30℃), excellent durability against vibration, bending motion, and oil is required, and when the appearance, etc. is required to be difficult to deform even at temperatures of +200℃. be suitable for use.

(Prior Art) Conventionally, thermoplastic polyurethane and crosslinked vinyl chloride resin have been widely used for the sheaths of cables for automobiles, cables for robots, and the like.

(Problems with the prior art) The thermoplastic polyurethane resin described above has excellent durability against vibration, bending motion, and oil at low temperatures (-30°C), but it melts at high temperatures (+200°C). There was a problem with this.

In addition, cross-linked vinyl chloride resin is difficult to melt at high temperatures (+200℃), contrary to thermoplastic polyurethane resins, but it is difficult to melt at low temperatures (+200℃).
There was a problem in that the durability against vibration and bending motion at -30°C was poor.

(Objective of the Invention) The object of the present invention was developed to solve the problems mentioned above.
It is an object of the present invention to provide a cable that has excellent durability against vibration, bending interlocking, and oil in the above range, and furthermore, its appearance does not easily deteriorate even if the temperature is temporarily increased to +200°C.

(Means for Solving the Problems) The cable according to claim 1 of the present invention includes a cable core 2 having a plurality of insulated wires l, and a tape 3 spirally wound around the cable core 2. In a cable having a pressing layer 4 and a sheath 5 provided on the outside of the pressing layer 4, the sheath 5 is mainly made of ethylene vinyl acetate copolymer containing 10 to 22% vinyl acetate. It is cross-linked with wire.

The cable according to claim 2 of the present invention is characterized in that the cable itself has a spiral shape in the invention according to claim 1.

(Function of the Invention) The cable of the present invention is provided with a sheath 5 mainly made of ethylene vinyl acetate copolymer containing 10 to 22% VA on the outside (outermost layer) of the rolled layer 4. 30℃)
Resistant to vibrations, flexural movements and oils at high temperatures (+ 130°C) and - +200°C
It does not crack or melt in appearance even at temperatures of

(Example) The present invention will be described in detail below based on the drawings. FIG. 1 is a schematic sectional view of an example of the cable of the present invention. This cable consists of a core wire (a) made of a conductive material such as copper, and an insulating layer (l) formed on the outside of the wire (l), which are bundled together to form a cable core (2), and the core (2) is interposed with cotton yarn as necessary. 6 are twisted together to form a multicore twisted insulated wire 7, and a plastic tape, paper tape, etc. (specifically, cancer paper) 3 is wound spirally around the outside of the insulated wire 7 to form a rolled layer 4. and ethylene vinyl acetate copolymer 1 having a VA (vinyl acetate) content of 10 to 22% on the outside.
The sheath 5 is coated with a resin composition comprising 0.00 parts by weight and 1 part by weight of an antioxidant.

The insulation layer of the insulated wire 1 may be made of cross-linked PE, cross-linked PvC, etc., the cotton thread interposition 6 may be made of Tetron interposition, etc., and the ethylene vinyl acetate copolymer contains a stabilizer, a filler 1, a coloring agent, and a crosslinking accelerator. The sheath 5, which is mainly made of ethylene-vinyl acetate copolymer, may be cross-linked by radiation irradiation.

The reason for limiting the acid content of VA to 10 to 22% is that
This is because if the VA is less than 10%, durability against bending and vibration at low temperatures (-30° C.) cannot be obtained, and if it is more than 22%, the oil resistance will decrease.

FIGS. 2 and 3 show an example of the wire shape of the cable of the present invention. The cable shown in these figures has a spirally curled central portion in the longitudinal direction, and the diameter of the spiral portion 8 is not particularly limited and can be determined as appropriate depending on the application. Also, the number of times it is curled is 1
The number of times is not limited to two, but may be two or more times as necessary.

FIG. 4 shows a schematic diagram of a cable bending test of the present invention. It is bent at 90 degrees at the helical part 8, one end 9 is fixed, and the other end 10 is bent at low temperature (-30 °C) and high temperature (+13 °C).
It performs a 70 degree swinging motion at a temperature of 0°C. By the way, this explains the cable of the present invention.
Although the cable was oscillated 107 times at a speed of 107 times per minute, no problems (defects in appearance, cracks, etc.) occurred with the cable.

Also, at low temperatures (-30°C) and high temperatures (+130°C), one end 9 was fixed in the same way as in the previous case.

The other end lO was oscillated 1 million times with an amplitude of 101 sets and a frequency of 10)1z, but no problems were caused in appearance.

Furthermore, even when the cable of the present invention was self-diameter wound at 200''C for 1 hour, no fusion or cracks were observed in the appearance.

Also, the cable of the present invention is immersed in engine oil.
No change was observed even after immersion in an atmosphere at 30° C. for 1 hour.

(Effect of the invention) The sheath 5 of the cable of the present invention contains 10 to 2 vinyl acetate.
Mainly composed of ethylene vinyl acetate copolymer containing 2%,
Since this is crosslinked with an electron beam, it has the following effects.

(1) In the range from low temperature (-30°C) to high temperature (+130°C), it had sufficient durability against vibration and bending motion, and had sufficient oil resistance.

(2) - Can withstand temperatures as high as 200°C,
Even at a high temperature of 200°C, no melting or cracks are visible on the outside.

(3) At low temperatures (-30°C) to high temperatures (+130°C), in areas where vibration, bending, mechanical durability, etc. are required, and where oil resistance and instantaneous heat resistance at 200°C are required. It can be used and has extremely great practical value.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an embodiment of the cable according to the present invention, Fig. 2 is a side view of the cable, Fig. 3 is a plan view of the cable, and Fig. 4 is an explanatory diagram of a bending test of the cable. It is. l is the insulated wire 2 is the cable core 3 is the tape 4 is the rolled layer 5 is the sheath

Claims (2)

[Claims] (1) A cable core 2 having a plurality of insulated wires 1;
In a cable having a rolled layer 4 formed by spirally wrapping a tape 3 around the cable core 2, and a sheath 5 provided on the outside of the rolled layer 4, the sheath 5 contains 10 to 22% of vinyl acetate. % ethylene-vinyl acetate copolymer, which is cross-linked with electron beams. (2) The cable according to claim 1, wherein the cable has a spiral shape.