Apparatus for producing double-walled corrugated pipes
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United States of America Patent
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-
Mar 15, 1988
Grant Date -
N/A
app pub date -
Apr 23, 1987
filing date -
Jun 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for producing helically wound double-walled fused thermoplastic pipes, corrugated outside and smooth inside. The apparatus includes extruder means forming two bands of a thermoplastic material, a former shaping the corrugated configuration of and helically winding the first extruded band, a cooled element pressing the second band to the inside of the corrugations and having passages communicating with the second band and with a vacuum means.
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