Method for manufacturing corrugated tubes
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United States of America Patent
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-
Sep 8, 1987
Issued Date -
N/A
app pub date -
Nov 20, 1985
filing date -
Jun 8, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for forming a corrugated tube having a smooth inner wall surface and a corrugated outer wall are provided. A first strip of resin material is wrapped around first portions of rollers arranged in a circular array and is helically wrapped around the first portions of the rollers each having equally spaced ridges therearound to form the corrugated outer wall. A second strip of resin material is fed from the interior of second portions of rollers arranged in a circular array onto the inner surface of the outer wall being manufactured and bonded thereto. The second strip bonded to the outer all is wrapped around the second portions of the rollers each having a smooth surface to form the smooth inner wall.
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