JPS6021457B2 - Method for manufacturing cross-linked polyethylene cable with metal shielding layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a crosslinked polyethylene cable with a metal shield layer.

Conventionally, the general method for forming a metal shielding layer on the insulator of a cross-linked polyethylene cable is 0.1 to 0.2.
Methods that have been adopted include wrapping a metal tape such as side-thick steel tape around the insulator, or running multiple metal wires with one or two ribs along the length of the cable at a constant pitch. Ta.

These metal shielding layers may develop buckling wrinkles due to the difference in thermal dielectric strength coefficient between the insulator and the metal shielding layer due to thermal expansion and contraction when the T-cable is used. As a countermeasure for this, the second
A metal shielding layer has been proposed in which a corrugated metal tape as shown in the figure is spirally arranged at a constant pitch in the axial direction of the cable.

This will be explained with reference to FIGS. 1 to 3. The crosslinked polyethylene cable 1 has an internal semiconducting turtle layer 10 on the outer periphery of a conductor 4, an insulator 11 made of crosslinked polyethylene is coated on the outer surface of the conductor 4, an outer semiconducting layer 12 on the outer periphery of the insulator 11, and an outer semiconducting layer 10. A corrugated metal tape 2 as shown in FIG. 3 is wrapped around the outer periphery of the conductive layer 12 in a spiral shape at a constant pitch along the length, and after tightening the metal tape 2 with a pinned tape 3, a vinyl etc. It is formed by covering the sheath 13 of. In the cable in which the metal shielding layer is formed by the corrugated metal tape 2 as described above, it is possible to prevent the generation of buckling wrinkles in the metal shielding layer when the cable is thermally expanded and contracted due to energization. However, the conventional method for manufacturing a cable having a metal shielding layer of corrugated metal tape has a drawback of low production efficiency. An object of the present invention is to provide a method for manufacturing a crosslinked polyethylene cable with a metal shielding layer, which can improve productivity by continuously manufacturing cables having a metal shielding layer made of the above-mentioned corrugated metal tape.

The present invention provides corrugation processing by supplying a metal tape for forming a metal shielding layer into a corrugation die through a rotary bobbin for metal tape extrusion on the outer periphery of an insulator extruded from the extrusion crosslinking process of a crosslinked polyethylene cable. At the same time, it is wound in a spiral shape, and the pinned tape is wound around the outer periphery of the corrugated metal tape via a rotating bobbin for extruding pinned tape, and then sent to the sheath extrusion process and the above steps are performed continuously. This is how it was done.

The method for manufacturing a crosslinked polyethylene cable with a metal shielding layer according to the present invention will be explained below with reference to FIG.

In the crosslinking extrusion step 5 of crosslinked polyethylene, the cable core 14 is extruded with the crosslinked polyethylene insulator 11 and outer semiconductive layer 12 covered. A metal tape 2 for forming a metal shielding layer is supplied to the outer periphery of the external semiconductive layer 12 of the cable core 14 via a rotary bobbin 6 for metal tape extrusion to a corrugation die 7 to perform corrugation processing. After that, it is wound in a spiral shape with a constant pitch. A pinned tape 3 is wound and fixed around the outer circumference of the corrugated metal tape 2 via a rotary bobbin 8 for extruding pinned tape, and then sent to a sheath extrusion process 9 to cover the sheath 13 to complete the cable. Perform the process continuously. Therefore, according to the manufacturing method of this embodiment, everything including the manufacturing method of the corrugated metal tape can be carried out continuously, and therefore the productivity can be further improved.

It should be noted that various materials other than steel tape and aluminum tape can be used as the material for the metal tape 2, but copper and aluminum tapes are particularly suitable as good electrical conductors.

As described above, the metal shielding layer-attached cross-linked polymer of the present invention. The method for manufacturing a ethylene cable has the effect of further improving the productivity of cables having a metal shielding layer made of corrugated metal tape.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a cross-linked polyethylene cable with a metal shielding layer made of ordinary corrugated metal tape, Figure 2 is a front view of the portion of Figure 1 excluding the cable sheath, and Figure 3 is a cross-sectional view of the cable sheath.
FIG. 4 is a cross-sectional view of the corrugated metal tape, and FIG. 4 is a schematic diagram of manufacturing equipment for carrying out the method for manufacturing a crosslinked polyethylene cable with a metal shield layer according to the present invention. In the figure, 2 is metal tape ~ 3 is pinned tape,
4 is a conductor, 5 is a crosslinking extrusion process, 6 is a rotating bobbin for extruding metal tape, 7 is a tice for corrugated processing, 8 is a rotating bobbin for extruding pinned tape, 9 is a sheath extrusion process, 11 is an insulator, ears 3 is a sheath. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 Cover the outer periphery of the conductor with a cross-linked polyethylene insulator, wrap a corrugated metal tape having a corrugated shape in the axial direction around the outer periphery of the insulator in a spiral shape, and wrap a bind tape over the corrugated metal tape to provide metal shielding. In the method for producing a crosslinked polyethylene cable with a metal shielding layer, the metal shielding layer is covered with a rubber or plastic sheath, and a rotary bobbin for extruding a metal tape is attached to the outer periphery of the insulator extruded from the extrusion crosslinking process of crosslinked polyethylene. A metal tape for forming an intervening metal shielding layer is fed into a corrugated die to perform corrugation and is wound in a spiral shape, and a rotating bobbin for extruding bind tape is placed around the outer periphery of the corrugated metal tape. A method for manufacturing a cross-linked polyethylene cable with a metal shielding layer, characterized in that after winding an intervening bind tape, the cable is sent to a sheath extrusion process, and the above steps are performed continuously.