JPS5819775Y2 - Water running prevention type communication cable - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a water running prevention type communication cable.

Conventional cables of this type include those in which the voids in the cable core are filled with polybutene-based or petroleum gelatin, and those in which the voids are filled with a water-absorbing and swelling powder material.

However, the former cable has disadvantages in that the material used is expensive and the manufacturing equipment is involved, leading to an increase in cost.

In addition, since the dielectric constant of the wire is high, the transmission loss of the cable increases.Furthermore, during connection work, the wire may attract sand and dust, and the wire may adhere to tools and connectors, making the work difficult. There were also drawbacks.

On the other hand, the latter cable was extremely difficult to manufacture because it was difficult to completely fill the void in the cable core due to the nature of the powder material.

In view of the above points, the present invention is easy to manufacture,
It was developed with the aim of providing an economical and improved water running prevention type communication cable, and its gist is that it is made by further collecting and twisting insulated conductor single wires, twisted pairs, and cut twisted wires. In a communication cable consisting of a cable core and a sheath covering the cable core, an adhesive thin film is provided around the outer periphery of the insulated conductor, and a water-absorbing and swelling powder material is provided in the void inside the core. A water running prevention communication cable is characterized in that it is filled with:

Next, an embodiment of the cable of the present invention will be explained with reference to the attached drawings. 1 is an insulated conductor, and the required number of single wires, twisted pairs, and canted twisted wires are further assembled and twisted. This constitutes the cable core.

Reference numeral 2 is a thin film of adhesive gel applied to the outer periphery of the insulated conductor 1, and reference numeral 3 is a water-absorbing and swelling powder material filled in the cavity of the cable core.

Reference numeral 4 indicates a wraparound tape provided around the outer periphery of the cable core, 5 a shield, and 6 an extrusion-covered sheath.

In the above, the insulated conductor 1 is a copper conductor coated with a polyolefin insulator by extrusion, but foaming the insulator has the advantage of lower dielectric constant and lower transmission loss. .

A petroleum-based or polybutene-based mixture is suitable as the adhesive jelly 2. Due to the presence of the tacky jelly thin film 2, the water-absorbing and swelling powder material 3 adheres to the outer periphery of the insulated conductor 1. This makes it extremely easy to fill.

In addition, the presence of the wire 2 acts as a seal for pinholes, especially when the insulator of the insulated conductor 1 is foamed, and prevents water from penetrating into the conductor even if the cable were to be flooded with water. It is something.

As the water-absorbing and swelling powder material 3, carboxymethyl cellulose is suitable.

This water-absorbing and swelling powder material 3 absorbs water and swells to act as a dam and prevent water from running in the event that the cable is flooded with water.

The cable of the present invention, which is constructed as described above, is coated with adhesive gel and filled with water-absorbing and swelling powder, so that the powder is completely filled and a high-quality anti-water run cable is obtained. It also has the advantage of being easy to manufacture.

Furthermore, since it can be filled with powder, it is lightweight, easy to install, and very easy to handle when connecting.

[Brief explanation of the drawing]

The accompanying drawing is a partially sectional explanatory view showing an embodiment of the cable of the present invention. 1: Insulated conductor, 2: Adhesive ZIELI thin film, 3: Bi-water-swellable powder material, 4: Wrap tape, 5: Shield layer, 6: Extruded coating sheath.

Claims (1)

[Scope of utility model registration request] In communication cables, the outer periphery of the insulated conductor is coated with an adhesive jelly. 1. A water running prevention type communication cable, characterized in that a thin film is provided and a void in the core is filled with a water-absorbing and swelling powder material.