Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1987-12-23
1989-06-13
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
425462, 425532, B29C 4704
Patent
active
048387789
ABSTRACT:
A coextrusion head for the continuous production of laminated tubes to be used as parisons in blow molding. The tubes consist of a plurality of layers of synthetic resins. The synthetic resin layers include one or more supporting layers, usually a barrier layer, and adhesive layers as necessary. The layers are brought together by axial, annular feed passageways within the coextrusion head prior to the laminated tube being extruded through a nozzle in the head. Frequently one layer, generally the barrier layer, has different flow characteristics than those of the other layers, whereupon structural defects can arise in the formed tube. The apparatus described forestalls such structural defects by feeding the various layers into confluence in a manner that precludes, or sufficiently minimizes, the time layers having differing flow characteristics have contact with feed passageway walls while in confluence. As a result, shear stresses within or between the individual layers is avoided and the tube so produced is free of structural defects.
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Becker Rudolf
Beyer Hans
Neubauer Wilhelm
Pohl Harald
Albright Penrose
Chiesa Richard L.
Miller Robert A.
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