Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1977-04-27
1978-03-21
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
4251742, 4251746, 425404, 425122, 425445, B29F 300, B29D 302
Patent
active
040801314
ABSTRACT:
This invention makes extruded, vulcanized, high voltage cables insulated with thermosetting compounds at much higher rates of production and with superior insulation of reduced thickness and with reduced cavities or voids in the insulation. As the cable comes from an extruder, it passes into a curing chamber with a heat booster that quickly raises the insulation to a temperature at which it is cured much more quickly than with steam heating of the prior art. A high temperature liquid in contact with the insulation maintains the high temperature; and because of the greater curing heat, the cable can travel through the curing chamber at a faster rate and into a cooling tube where it contacts with a cooling liquid under high pressure. The insulation compound is treated to reduce the size of cavities; and the high pressure maintained by the curing and cooling mediums prevent expansion of cavities before the insulation is set.
REFERENCES:
patent: 3045281 (1962-07-01), Skobel
patent: 3645656 (1972-02-01), Stauffer et al.
patent: 3650647 (1972-03-01), Jacobs et al.
patent: 3737490 (1973-06-01), Nicholson
patent: 3900539 (1975-08-01), Puleo
patent: 3909177 (1975-09-01), Takaoka et al.
patent: 3988092 (1976-10-01), Bloxham et al.
Bahder George
Bopp Louis A.
Katz Carlos
Calimafde John M.
Flint, Jr. J. Howard
General Cable Corporation
Hopgood Roy C.
Neill Charles W.
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