Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1972-12-29
1977-11-01
Shore, Ronald J.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
4251331, 425380, 425462, 425467, B29D 2304
Patent
active
040563448
ABSTRACT:
An apparatus and method are provided for producing extrusions of two or more materials such as plastic polymers so as to utilize the characteristics of both materials in a single formation thereof. In one form, flexible and rigid polymers are coextruded through a common die to form selected portions of the length of an extrusion or to form portions of the length of an extrusion composed of one polymer and other portions composed of the same polymer plus a second polymer. Tubing may be formed having portions of its length made completely of a flexible polymer and other portions thereof made of a rigid polymer. The apparatus mahy also form rigid pipe having elastomeric material coated or extruded along selected lengths thereof such that when severed along said lengths, selected pipes may be formed thereof containing end seals formed integral with each length.
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Rosenbaum Mark
Shore Ronald J.
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