JPH0452890Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to communication cables.

[Prior Art] In communication cables, various tapes are wrapped around the core wire to form a coating layer.

FIG. 2 shows an example of a cross section of a communication cable, where 1 is a cable core, 2 is an insulating tape made of polyethylene or vinyl, and 3 is a heat-resistant tape made of polyester or the like. P is the overlapping portion that occurs when each tape is wound.

In this communication cable, a polyethylene or vinyl tape 2 is placed on top of the cable core 1 from A to A in the figure.
It is wound in the range shown in B, C to D, and a heat-resistant raw polyester tape 3 is wound thereon in the range shown in A to C in the figure. The range from C to B indicated by P in the figure is the overlapping portion of the tapes.

[Problems to be solved by the invention] As mentioned above, in a communication cable, insulating tape and heat-resistant tape are wrapped in layers over the cable core, but when a sheath is placed on top of the tape, The heat generated during extrusion coating causes the tape to fuse in the overlapping area (Figure 2P).

In order to prevent this fusion phenomenon, it is possible to use only a highly heat-resistant tape, such as a polyester tape, for winding, but this is not economically advantageous because the tape itself is expensive.

Heat-resistant tapes include tapes made by laminating polyethylene tapes and polyester tapes, but even such tapes are still expensive, and cost problems still remain.

An object of the present invention is to provide an inexpensive and high-performance communication cable that prevents fusion occurring in the overlapped portions of tapes.

[Means for Solving the Problems] The present invention provides a communication cable in which an insulating tape and a heat-resistant tape are provided on the outer periphery of a cable core, in which the heat-resistant tape is formed between the insulating tape and the cable core. The tape is wound so as to be interposed between the overlapping parts of the tape and to cover the overlapping parts, thereby preventing fusion occurring at the overlapping parts of the tape, thereby making it possible to obtain an inexpensive and high-performance communication cable. It was designed to achieve its purpose.

[Function] In the communication cable of the present invention, when wrapping an insulating tape and a heat-resistant tape around the outer periphery of the cable core, the heat-resistant tape is interposed between the overlapping portions of the tapes to cover the overlapping portions. Since the cable is wrapped in such a manner as to prevent heat fusion occurring in the overlapping portion due to heat generation during sheath exterior, it is possible to obtain a communication cable with stable performance by preventing deterioration of characteristics due to fusion. I can do it.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of one embodiment of the communication cable of the present invention. The same reference numerals are used for the same parts as in FIG.

4 is a heat-resistant tape, and polyester tape or the like is used.

In this embodiment, the polyethylene tape or vinyl tape 2 is wound around the ranges A to B and C to D in the figure in the same manner as in the case of FIG. 2, but the heat-resistant tape 4 to be wound thereon is , as shown in the figure, is interposed between the overlapping portion P and is wound in the range D to E.

By wrapping the heat-resistant tape 4 over a wide range as shown in D to E, the overlapping portion P is blocked by the heat-resistant tape 4, and the overlapping portion P is wrapped in a wide range Q as shown in D to C in the figure. Since the tape 4 is covered with the heat-resistant tape 4, even if the overlapped part P is heated, such as when the overlapped part P is covered with a sheath, it is possible to prevent the overlapped part P from being fused due to melting of the tape 2. Therefore, you can get a cable with excellent performance.

As described above, by using this embodiment, it is possible to prevent fusion that occurs at the overlapped part of the tape wound on the cable core during cable manufacturing, so that communication cables with stable electrical and thermal performance can be manufactured. Obtainable.

[Effect of the invention] According to the invention, heat-resistant tape is interposed between the overlapping parts of the insulating tapes wrapped around the outer periphery of the cable core, thereby preventing the overlapping parts of the insulating tapes from fusing. It is possible to provide inexpensive and high-performance communication cables.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the communication cable of the present invention, and FIG. 2 is a cross-sectional view of a conventional communication cable. 1... Cable core, 2... Insulating tape,
3, 4...Heat-resistant tape.

Claims (1)

[Scope of utility model registration request] In a communication cable in which an insulating tape and a heat-resistant tape are provided on the outer periphery of a cable core, the heat-resistant tape covers the overlapping part while being interposed between the overlapping part formed between the insulating tape and the insulating tape. A communication cable characterized by being wound in a manner similar to that of a cable.