JPS6252811A - Manufacture of cable having corrugated metal layer - Google Patents

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method of manufacturing a cable having a corrugated metal layer.

(Technical Background of the Invention and Problems Thereof) Conventionally, in cables having a corrugated metal layer, a material such as an extruded layer of compound or a wound layer of tape is placed in the gap between the cable core and the corrugated metal layer. Providing a seat layer is practiced. However, in such a cable, since the contact area between the seat floor layer and the corrugated metal layer is small, there has been a problem that the cable core can be pulled out during cable installation.

In order to eliminate these drawbacks and improve workability in the process of providing the corrugated metal layer, in recent years, compressible yarns have been wrapped around the surface of the cable core in a compressed state with cuttable tape to create a seat floor. At the same time, a thin metal wire is placed between the yarn and the tape, and a corrugated metal layer is provided on top of the thin metal wire.The tape is then cut by passing an electric current through the metal wire to determine the compressed state of the yarn. A cable manufacturing method has been developed which is characterized in that the gap between the cable core and the corrugated metal layer is filled with a seat layer.

However, with this method, one or more thin metal wires must be inserted between the yarn and the tape.
In addition, there is a problem in that cutting the tape to decompress the yarn is time-consuming, such as the need to energize these metal wires afterwards.

(Purpose of the Invention) The present invention has been made to solve such problems, and it is possible to create a cable with a corrugated metal layer that does not cause troubles such as handling the cable during installation, but does not require special effort. The purpose of the present invention is to provide a method for efficiently manufacturing the product without causing any problems.

(Summary of the Invention) The method for manufacturing a cable having a corrugated metal layer of the present invention provides a layer in which a compressible yarn is wound in a compressed state with a heat-cuttable tape on the surface of a cable core, and a corrugated metal layer is formed on the surface of the cable core. After providing the metal layer so that the inner circumferential surface of the troughs of the layer is in contact with the tape, the corrugated metal R layer is heated from the outside to cut the tape, thereby reducing the compressed state of the yarn. It is characterized by being released.

Compressible yarns used in the present invention include yarns made of compressible plastic materials, such as anti-aging polypropylene. Examples of heat-cuttable tapes that press the tape into a compressed state include, for example, polypropylene tapes that do not contain anti-aging agents.

Generally speaking, in the present invention, the corrugated metal layer is heated before being coated with the anticorrosive layer, and this can be done by a heating method using a gas burner, a high frequency induction heating method, or the like.

Furthermore, in the present invention, since the tape is cut by the heat directly conducted from the heated corrugated metal layer, the corrugated metal layer is cut so that the inner circumferential surface of the troughs is in contact with the tape. More preferably, the tape is provided so as to be in contact with the tape while being pressed from the outside.

(Example of the invention) Embodiments of the present invention will be described below based on the drawings.

As shown in Fig. 1, compressible yarn (2) is first wound around the surface of the cable core (1), and then a tape (3) made of heat-cuttable material is wrapped around the compressible yarn (2).
) is tightly wrapped to form a seat layer (4).

Next, a corrugated metal layer (5) is placed on top of this floor layer (4) so that the inner peripheral surface of its own troughs is in contact with the surface of the tape (3).
) will be established. However, this corrugated metal layer (5) is heated from the outside using a gas burner or the like, and the tape (3) is cut by this conductive heat. By cutting the tape (3), the yarns (6) are released from compression and completely fill the gap between the cable core (1) and the corrugated metal layer (5), as shown in FIG. Finally, corrugated metal 1! An anticorrosive layer (7) is coated on the W (5).

According to the embodiment configured as described above, when the corrugated metal layer (5) is provided in the manufacturing process, the lower seat layer (4) has a relatively smooth surface with few irregularities. Therefore, it can be easily coated.

Moreover, in the obtained cable, the decompressed yarn (6) is connected to the cable core (1) and the corrugated metal layer (
5), so troubles such as pulling out the cable core (1) do not occur during installation, and the workability of the installation work is good.

Furthermore, since the tape (3) compressing the yarn (2) is cut by heating the corrugated metal layer (5) from the outside, there is an advantage of high manufacturing efficiency and productivity. .

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to efficiently manufacture a cable having a corrugated metal layer that does not cause cable core pull-out and is easy to install. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a cable for explaining the present invention in detail, and FIG. 2 is a vertical cross-sectional view of a cable manufactured by the method of the present invention. (1)...Cable core (2)...Compressible yarn (3)...Heat-cuttable tape (5)...
...Corrugated metal layer

Claims (1)

[Claims] 1. A layer in which compressible yarn is wrapped in a compressed state with a heat-cuttable tape is provided on the surface of the cable core, and a corrugated metal layer is placed on top of the layer so that the inner peripheral surface of the troughs of the layer is connected to the heat-cuttable tape. A method for manufacturing a cable having a corrugated metal layer, comprising: heating the corrugated metal layer from the outside to cut the tape to release the compressed state of the yarn.