B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 23/00 (2006.01) B29C 47/06 (2006.01) B29C 47/12 (2006.01) B29C 47/20 (2006.01) B29C 47/90 (2006.01) B29C 49/00 (2006.01) F16L 9/18 (2006.01) B29C 57/02 (2006.01)
Patent
CA 2285131
For the continuous manufacture of a twin-wall pipe having a pipe socket and consisting of a smooth internal tube and an external tube, which is welded together therewith and provided with transverse grooves, two ex- truders are provided, which extrude an external tube and an internal tube via a joint crosshead. Switches are provided for the production of a pipe socket, by means of which the speed of the extruder is modified in such a way that the mass flow of the melt of plastic material for the production of the external tube is reduced during the production of the pipe socket and/or the mass flow for the production of the inner tube is augmented.
Hegler Ralph Peter
Marks & Clerk
LandOfFree
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