Single die co-extrusion apparatus for insulation

Details Single die co-extrusion apparatus for insulation Single die co-extrusion apparatus for insulation

1976-09-16

1978-06-06

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Extrusion shaping means

4251331, 425462, 425817C, B29F 310

Patent

active

040934144

ABSTRACT:
This invention is a single die by which thermoplastic insulating compounds can be co-extruded without any die for the first layer. It makes possible the extrusion of a high-density solid polyethylene skin layer over a cellular polyethylene primary insulation. Such a combination is difficult or impossible to make with a conventional co-extrusion die having a wire guide tip, one combination tip/die and a secondary extrusion die.

REFERENCES:
patent: 3111712 (1963-11-01), Frate
patent: 3635620 (1972-01-01), Brown
patent: 3737490 (1973-06-01), Nicholson

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