JPS59198817A - Crosslinked rubber and plastic insulated cable connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cross-linked rubber material in which an external semi-electrical layer is formed using a semi-conductive heat shrinkable tube around the outer periphery of an insulating reinforcing layer made of cross-linked rubber/plastic. -Relates to a method of forming a plastic insulated cable connection part.

[Technical Background of the Invention] Conventionally, as a method for forming and covering an external semiconducting layer in a cross-linked rubber/plastic insulated cable connection section, a method has been proposed in which a cross-linked rubber/plastic is used as a base on the outer periphery of an insulating reinforcing layer made of cross-linked rubber/plastic. A method has been used in which a semiconductive heat-shrinkable tube is inserted into the material and heat-shrinked.

[Problems with the Background Art] However, in the external semiconductive layer formed by such a method, sufficient adhesion cannot be obtained because both the insulation reinforcing layer and the semi-8g conductive heat shrink tube are suspended. However, the problem was that the electrical properties were insufficient.

[Object of the Invention] The present invention has been made to solve these drawbacks, and provides a method for easily forming a cable connection portion with improved electrical characteristics by obtaining sufficient adhesion between an insulating reinforcing layer and an external semiconducting layer. It is an object of the present invention to provide a method for forming a crosslinked rubber/plastic insulated cable connection part that can be obtained.

[Summary of the Invention] That is, the method for forming a crosslinked rubber/plastic insulated cable connection portion of the present invention is to form a crosslinked rubber/plastic insulated cable connection portion on the outer periphery of an insulating reinforcing layer made of crosslinked rubber/plastic provided on a conductor connection portion of a cable that is connected by stripping. In forming the external semiconductive layer, an insulating rubber/plastic tape wound layer that can be fused by heating is provided around the outer periphery of the insulating reinforcing layer, and a cross-linked A semiconductive heat-shrinkable tube based on rubber/plastic is attached and heated to shrink the semiconductive heat-shrinkable tube and melt the insulating rubber/plastic wound layer, thereby forming the insulating reinforcing layer and the insulating layer. [Embodiment of the Invention] The details of the present invention will be described below with reference to an embodiment shown in the drawings.

The drawing is a longitudinal cross-sectional view of a crosslinked rubber plus deck insulated cable connection in the process of being formed according to one embodiment of the method of the present invention.

In the figure, in the method of the present invention, the cable conductor 2.2 of a cross-linked rubber/plastic insulated cable, for example a cross-linked polyethylene cable 1.1, which has been peeled off and connected in stages, is
For example, the connection is made using the connection sleeve 3, and then the insulating reinforcing layer 4 made of crosslinked polyethylene is wrapped around the outer circumference by tape wrapping or injection molding.
is molded. Thereafter, an external semiconductive layer is formed on the outer periphery of the insulation reinforcing layer 4. In the method of the present invention, the outer periphery of the insulation reinforcing layer 4 is wound with a crosslinkable polyethylene tape containing a crosslinking agent or a non-crosslinked polyethylene tape. A layer 5 is formed, and a semiconductive heat-shrinkable tube 7 serving as an external semiconductive layer is fitted over the cable semiconductive layer 6.6 on the outer periphery of the insulating reinforcing layer 4 via this tape wound layer 5. Heat treatment is performed.

As it is heated, the semiconductive heat-shrinkable duplex 7 contracts, and then the tape-wound layer 5 melts, and the tape-wound layer 5 and the insulating reinforcing layer 4 become semiconductive due to the contraction pressure of the semiconductive heat-shrinkable tube 6. It is completely fused and integrated with the shrink tube 7.

At this time, it is desirable to perform the heating under reduced pressure in order to avoid the generation of voids. Since the thus obtained connection part uses a crosslinked semiconductive heat-shrinkable tube 7, the smoothness of the semiconductive layer is not impaired and has good electrical properties. A connection part for a crosslinked polyethylene insulated cable 1 is obtained.

In the above example, an example in which the present invention was applied to forming a connection part of a cross-linked polyethylene cable was explained.
The present invention should not be limited to such examples;
For example, it can be similarly applied to the formation of EP rubber insulated cable connections.

Furthermore, it is also possible to use polyolefins and other rubbers and plastics other than polyethylene for the insulation reinforcing layer, the tape winding layer, and the semiconductive heat-shrinkable tube.

[Effects of the Invention] As explained above, according to the present invention, an insulating rubber material capable of heat-sealing a semiconductive heat-shrinkable tube made of cross-linked rubber/plastic onto an insulating reinforcing layer made of cross-linked rubber/plastic is provided. - Since the plastic tape is heat-shrinked and brought into close contact via the plastic tape winding layer, a cable connection portion with excellent electrical properties without protrusions on the semiconductive layer can be obtained. Further, since the thickness of the wound layer of the insulating rubber/plastic tape may be small, it does not take much effort to form it, and the work can be completed in a short time.

[Brief explanation of the drawing]

The drawings are longitudinal sectional views for explaining one embodiment of the present invention. 1...Cross-linked polyethylene insulated cable 2...Cable conductor 3...
・・・・・・・・・Connection sleeve 4・・・・・・・・・
...Insulation reinforcing layer 5...Tape winding layer 6...Cable semiconducting layer 7.
・・・・・・・・・・・・Patent attorney representing semi-conductive heat shrinkable tube Satoshi Suyama - (1 other person)

Claims (1)

[Claims] (1) When forming an external semiconductive layer on the outer periphery of the insulation reinforcing layer made of cross-linked rubber/plastic provided on the conductor connection part of the cable connected by stripping, the outer periphery of the insulation reinforcing layer is melted by heating. A layer of insulating rubber/plastic tape that can be worn is provided, and a semiconductive heat-shrinkable tube based on cross-linked rubber/plastic is attached to the outer periphery of this layer of insulating rubber/plastic tape and heated. Shrinking the semi-conductive heat-shrinkable tube and melting the insulating rubber/plastic wrap to fuse the insulating reinforcing layer, the insulating rubber/plastic tape-wound layer, and the semi-conductive heat-shrinkable tube together. A method for forming a cross-linked rubber/plastic insulated cable connection part, characterized by: