JPS5861510A - Communication cable - 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 The present invention relates to improvements in communication cables, such as coaxial cables and balanced pair cables. When communication cables are installed conduit-like under one-way roads, vehicles on the ground As a running object such as a cable moves in one direction, a cleave phenomenon occurs in which the cable moves in the running direction of the moving object due to the action of inertia. In this case, if the cable sheath is fixed, the internal cable core may move, causing the core wire or coaxial core to protrude from the connection portion or the like, or to buckle and cause trouble.

The cleavage phenomenon of the cable core can be prevented by making the frictional force between the sheath and the cable core sufficiently large.

The first method for manufacturing communication cables that implements this method is
As shown in the figure, it is necessary to integrate the cable core 1 with the core lug 2 of its outer station, and also to integrate the corer lug 2 with the sheath 3 around its outer periphery. Although the cable core I and the core lug 2 can be sufficiently integrated with each other by winding with a chive or the like, it is difficult to sufficiently integrate the core wrap 2 and the sheath 3 with each other. The reason for this is that when extruding the sheath, it is necessary to provide a certain amount of clearance between the corer and the sheath 3 to make it easier to make the cross section of the sheath 3 circular, and to prevent the core IK from being affected by heat. This is because it is

It is conceivable to use a material with a large coefficient of friction, such as male tape, as the core lug 2, which strengthens the integrity between the corer and the sheath 3.

However, in this case, in the drying process after coating the koala, the internal moisture escapes due to the presence of tape, etc., and it takes a very long time to dry.

SUMMARY OF THE INVENTION An object of the present invention is to provide a communication cable with sufficient integrity between a cable core and a cable sheath, and excellent manufacturability.

As shown in FIGS. 2 and 3, the communication cable of the present invention is provided with a second core rubber layer 2Bt having air permeability on the outer periphery of the cable core 1, and a metal tube on the outer periphery. A layer of double-sided adhesive laminate tape 7 with 40 double-sided KW adhesion layers 5 and 6 tons is provided by vertically covering or horizontally wrapping, a plastic sheath 3 made of plastic is provided around the outer periphery, and the laminating process is completed! The adhesive layer 5 on the inner surface of
The koala is adhered to the plastic layer 2A, and the outer adhesive layer 6 is adhered to the cable sheath 3.

Note that in the present invention, adhesion includes fusion.

Next, a specific example of the present invention will be explained with reference to FIG. The cable core 1 has an inner layer of 0.9-φ paper insulation quad T-24
It was formed from a 24-force wire assembly IA, with 8 coaxial cores IB twisted around its outer periphery, and 8 quads of 9wφ paper insulation quad ICs twisted together around the outer periphery. Coaxial core I
B is made of a mild steel wire with a central conductor of t-2, 6wφ, and the outer conductor is finished with an outer diameter of 10 daysφ, wrapped with soft iron tape and paper tape around the outer periphery, and has an outer diameter of 115mφ.A round conductor is used. The two Koala and Player wrapped four sheets of paper tape horizontally so that the outer diameter was 41 mm. The second koala layer 2B was formed by roughly winding one piece of 4-lyethylene tape.

The double-sided laminated Chigua was made by providing a polyethylene layer on both sides of the tape as an adhesive layer. The cable sheath 3 was provided by extruding and covering polyethylene to a thickness of 2 mm. In this state, the outer diameter of the cable was 46 m.

Such a communication cable is subjected to a drying process with the second corer and F layer 2B provided thereon to remove internal moisture and improve insulation resistance and dielectric strength. Thereafter, the ζ-nate tape 7 is longitudinally applied and coated, and the cable sheath 3 is extruded and coated on the outside thereof, and the heat generated at this time melts the adhesive layer 5 on the inner side of the ζ-nate tape 7 to the second core lug layer 28. ffK), and the outer adhesive layer 6 is adhered to the cable sheath 3 by fusion to integrate it.

The second corer layer 2B is formed by roughly winding a polyethylene tube, and this is to facilitate the release of moisture during the drying process, but it also serves to improve the flexibility of the cable. In addition, in the communication cable according to the invention described above, the second corer, f layer and cable sheath are formed vertically and with spliced sheathing, etc. Since a layer of double-sided adhesive laminated tape is provided between the cable core and the cable sheath, creep resistance can be improved. In addition, in the present invention, a layer of laminated tape and an adhesive second corer is provided around the outer periphery of the breathable first corerub layer, so that drying during the manufacturing process is prevented. This can be carried out without any problems, and can also be bonded to the cable sheath, resulting in good manufacturability.

[Brief explanation of drawings]

@ Figure 1 is a cross-sectional view of a conventional communication cable, Figure 2 is a cross-sectional view showing an example of the double-sided adhesive spiral tape used in the present invention, and Figure 3 is a cross-sectional view showing an example of the communication cable according to the present invention. FIG. 4 is a cross-sectional view showing a specific embodiment of the communication cable according to the present invention. 1 layer, 3... Cable sheath, 4... Metal tape, 5.6... Adhesive layer, 7.
・Double-sided adhesive laminated tape. Continued from page 1 0 Inventor Kunihiro Matsubara Kogyo Co., Ltd. Chiba Electric Wire Works Applicant Furukawa Electric Co., Ltd. 2-6-1 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] A first core lubricant layer that has air permeability and heats quickly is provided on the outer periphery of the cable core, and a second core lubricant layer that has adhesive properties with the adhesive layer of the double-sided adhesive tape to be described later is provided on the outer periphery of the first core lubricant layer. A core lubricant layer is provided so as to have air permeability, and a layer of a double-sided adhesive laminate chip having an adhesive layer on both sides is provided on the outer periphery of the second corer and f layer, and A cable sheath is provided with a cable sheath consisting of an outer circumferential layer of Kf last, and the inner adhesive layer of the ukinate tape is adhered to the core rubber layer of @2, and the outer adhesive layer is adhered to the cool sheath. A communication cable characterized by: