Method for continuously manufacturing compound corrugated pipe having smooth portions
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United States of America Patent
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Dec 5, 1995
Grant Date -
N/A
app pub date -
Nov 19, 1993
filing date -
Dec 1, 1992
priority date (Note) -
Expired
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Abstract
For the continuous manufacture of a compound pipe with a spigot which is substantially smooth on its outside, the compound pipe including a smooth internal tube and an external tube provided with transverse grooves and welded together with the internal tube, an external tube and an internal tube are extruded, the latter into the external tube. While the spigot which is substantially smooth on the outside is manufactured, its external wall is pressure-relieved by compensation chambers.
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