Apparatus for modifying corrugated or ribbed pipe to have a smooth outer wall
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United States of America Patent
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-
Jan 24, 1995
Issued Date -
N/A
app pub date -
May 13, 1994
filing date -
Nov 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Annularly or helically ribbed or corrugated semi-rigid thermoplastic pipe is modified to have a smooth outer wall. The ribbed or corrugated pipe is passed through a heated sleeve to squash and smooth the outer profile of corrugated pipe or bend over ribs of ribbed pipe and mold a smooth outer skin of the pipe. Apparatus for forming the modified pipe includes a travelling mold tunnel for the production of ribbed or corrugated pipe and a smoothing sleeve downstream thereof. The smoothing sleeve has a heater to heat it sufficiently to mold the smoother outer skin.
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