Cable having waterblocking provisions between layers of relative

Details Cable having waterblocking provisions between layers of relative Cable having waterblocking provisions between layers of relative

1991-02-28

1992-09-08

Nimmo, Morris H.

Electricity: conductors and insulators

With fluids or vacuum

With fluid stops

H01B 718, H01B 728

Patent

active

051460467

ABSTRACT:
A communications cable (20) includes a core (22) comprising a plurality of transmission media having a relatively supple layer (26) of a plastic material wrapped thereabout. Disposed about the layer of plastic material and in engagement therewith is a relatively rigid inner plastic jacket (28). Disposed about the inner jacket are additional components of a sheath system such as metallic shields and one or more additional plastic jackets. Interposed between the relatively supply layer of plastic material and the jacket is a waterblocking system which comprises two elongated strand materials (42,44) such as yarns. The two elongated strand materials are wrapped helically about the layer of plastic material in opposite helical directions. The elongated strand materials are effective to intercept water which may travel along the cable between the relatively supple layer of plastic material and the jacket which is contiguous thereto.

REFERENCES:
patent: 3340353 (1967-09-01), Mildner
patent: 3376378 (1968-04-01), Bullock
patent: 3638306 (1972-02-01), Padowicz
patent: 3812283 (1974-05-01), Kothe et al.
patent: 4563540 (1986-01-01), Bohannon, Jr. et al.
patent: 4815813 (1989-03-01), Arroyo et al.
patent: 4867526 (1989-09-01), Arroyo
patent: 4909592 (1990-03-01), Arroyo et al.
patent: 4913517 (1990-04-01), Arroyo et al.
patent: 4963695 (1990-10-01), Marciano-Agostinelli et al.
"Lanseal-F Super Absorbent Fiber" Bulletin published by Japan Exlan Co., Ltd.
"Waterblocking Yarns" bulletin distributed by GECA-Tapes.

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