Method and apparatus for manufacturing an extrusion having an uneven surface
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United States of America Patent
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Oct 15, 1996
Grant Date -
N/A
app pub date -
Mar 29, 1995
filing date -
Mar 29, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing an etched extrusion, the method comprising the steps of extruding a thermoplastic material to produce a hot extrusion, and contacting the extrusion, while the extrusion is still hot, with a mixture of at least two fluids having different thermal conductivities so that the extrusion develops an uneven outer surface due to different rates of shrinkage caused by the different thermal conductivities.
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