Method of making internally cross-ribbed plastics material structure
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United States of America Patent
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Jun 4, 1985
Grant Date -
N/A
app pub date -
Jul 1, 1983
filing date -
Jul 6, 1982
priority date (Note) -
Expired
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Abstract
A unitary tubular product having an inner layer and an outer layer connected together by a bi-planar mesh formed of helical ribs bonded at their cross-over points is produced in a single coaxial tubular extrusion process, the structure being integrally or confluently extruded. The extruder die head has annular flow channels having closely-spaced die grooves.
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