Process of extrusion-coating the central core with an insulator

Details Process of extrusion-coating the central core with an insulator Process of extrusion-coating the central core with an insulator

1976-05-20

1978-03-07

Kendall, Ralph S.

Coating processes

Electrical product produced

Wire conductor

427374D, 264174, 264118R, 264237, 174110PM, 174120SR, H01B 330, H01B 1314

Patent

active

040781119

ABSTRACT:
Provided hereinbelow is a process of extrusion-coating the central core, said core being used in a submarine coaxial cable, with an insulator of high pressure-processed polyethylene having a density of from 0.925 to 0.940 g/cm.sup.3 and a melt index of from 0.01 to 0.3 g/10 min with advantages in that said coaxial cable is allowed to be placed on a sea bottom of not less than 500 meters in depth and to effectively transmit alternating current signals with a maximum frequency of not less than 30 MHZ, while attenuation of said signals is reduced, and thus, said coaxial cable has a transmission capacity of not less than 3000 circuits or channels with a frequency band of from 3 to 6 KHz per each circuit or channels, wherein the insulator-covered-core is continuously extruded from an extruder and then is gradually cooled in cooling water troughs to room temperature so that the water content of said insulator, without formation of voids between said central core and said insulator, is reduced by as much as possible.

REFERENCES:
patent: 3043716 (1962-07-01), Busse et al.
patent: 3375303 (1968-03-01), Joyce
patent: 3728424 (1973-04-01), Bauer
patent: 3849192 (1974-11-01), Schmidt
patent: 3852518 (1974-12-01), Wargotz et al.
patent: 3868436 (1975-02-01), Ootsuji et al.

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