Textiles: spinning – twisting – and twining – Strand structure – Covered or wrapped
Patent
1982-03-12
1984-06-19
Watkins, Donald
Textiles: spinning, twisting, and twining
Strand structure
Covered or wrapped
57 7, 57232, 57233, 174120SC, D07B 714, H01B 902, H01B 734, H01B 1322
Patent
active
044547099
ABSTRACT:
A cable structure having a stranded inner conductor and an insulating layer over the conductor is formed by feeding a tape of semiconducting material onto the wire as it enters an extruder head. The tape is not spirally wound on the conductor but rather is fed longitudinally along with the wire into the extruder head so as to dispose the tape about the wire and beneath the insulation layer extruded thereon. The product formed has a good concentricity and the tape element conforms generally to the stranded wire to provide a minimum thickness of the tape composition to permit the cable to function effectively at medium voltage. The tape employed is preferably a semiconducting tape which can serve to distribute the electrical stresses emanating from the conductor when it is at high voltage. The tape may be formed of a crosslinkable material and the outer insulation may also be crosslinkable. Cable products having crosslinked insulation separated from a stranded conductor by a crosslinked semiconducting layer formed of a ring of crescents may be formed.
REFERENCES:
patent: 2067405 (1937-01-01), Mayne
patent: 3589121 (1971-06-01), Mulvey
patent: 3909507 (1975-09-01), Betts et al.
patent: 4125741 (1978-11-01), Wahl et al.
patent: 4259281 (1981-03-01), Lanfranconi et al.
patent: 4342880 (1982-08-01), Castelli et al.
General Electric Company
Rochford Paul E.
Watkins Donald
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