B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/02 (2006.01) B29D 99/00 (2010.01) B29C 47/02 (2006.01) B29C 47/12 (2006.01) B29C 49/00 (2006.01) F16L 9/133 (2006.01) B29C 49/04 (2006.01) B29D 23/22 (1990.01) B29D 31/00 (2006.01)
Patent
CA 2110360
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.
Hegler Ralph-Peter
Hegler Wilhelm
Hegler Wilhelm
Marks & Clerk
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