Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1978-09-22
1981-06-30
Smith, Ronald H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264211, 174110AR, 174110PM, 174120AR, 525322, B29F 310, B29H 910, B29C 2724
Patent
active
042762510
ABSTRACT:
This invention is an improved insulation for electric cables and an improved method of making the insulation. Cross linked polyethylene insulation is too stiff, particularly in high voltage cables which require a thick layer of insulation. Copolymers of polypropylene have electrical properties substantially equal to those of polyethylene, but do not have the necessary physical strength and have to be filled with clay or other filler that provides the required strength but degrades the electrical characteristics. A novel feature of this method is the utilization of the screw of the extruder to effect a mixing of the ingredients in an improved polymer system for cable insulation.
REFERENCES:
patent: 3455752 (1969-07-01), Grey et al.
patent: 3569610 (1969-10-01), Garner et al.
patent: 3749817 (1973-07-01), Shiga et al.
patent: 3860686 (1975-01-01), Myers
patent: 3885085 (1975-05-01), Bahden et al.
patent: 4123417 (1978-10-01), Finberg
Bueker Richard
Calimafde John M.
General Cable Corporation
Hopgood Roy C.
Neill Charles W.
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