High strength extruded tubular product and method for making said product
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 17, 2004
Issued Date -
N/A
app pub date -
Apr 12, 2000
filing date -
Feb 27, 1997
priority date (Note) -
Expired
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Abstract
Using a balanced flow path, multiple layers of extruded plastic are supplied to a chamber having independently rotating surfaces. Said rotating surfaces apply a shear force to at least the inner and outer layers of said extruded plastic to orient said materials in said layers in different helical patterns, thereby forming a multi-layer tubular product in which at least inner and outer layers have different helical patterns to strengthen the product.
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