Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1977-10-07
1981-01-27
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
174120SC, 4251331, B29F 310
Patent
active
042475040
ABSTRACT:
A method of manufacturing a plastic covered highvoltage cable by passing an electrical conductor through two successive separate extrusion heads. In the first extrusion head a conductor shield layer is extruded around said conductor as well as a thin auxiliary insulation layer around the conductor shield layer. In the second extrusion head a main insulation layer is extruded around the auxiliary insulation layer as well as, if preferable, a corona shield layer around the main insulation layer. The auxiliary insulation layer is of the same or electrically equivalent material as the main insulation layer. The auxiliary insulation layer prevents the formation of plastics burr on the surface of the conductor shield layer from during the first extrusion.
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Oy Nokia AB
Woo Jay H.
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