Multi-layer molten plastic body
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United States of America Patent
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May 28, 1991
Issued Date -
N/A
app pub date -
Nov 3, 1989
filing date -
Jun 26, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A modular extrusion head is disclosed including a plurality of cross head die modules, each including a flow path for a single resin. Molten resin layers are flowed from the modules onto a stepped mandrel and then along the mandrel and out an extrusion die to form a multi-layer parison. The layers are thin, with a uniform thickness and hole free. The modules are temperature zoned to permit flowing of a low temperature resin to and along the mandrel in contact with a high temperature resin without impairing the properties of the low temperature resin.
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