B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 23/18 (2006.01) B29C 47/06 (2006.01) B29C 47/20 (2006.01) B29C 47/22 (2006.01) B29C 47/90 (2006.01) F16L 9/12 (2006.01)
Patent
CA 2169212
For the production of a multilayer pipe of thermoplastic material, in particular polyolefine, an extrusion equipment is provided, extruding at least one tube in a direction of production. A calibrating arrangement for forming a pipe of externally profiled shape is provided downstream of the extrusion equipment. The calibrating arrangement is followed by a preheater for heating to welding temperature the outer surfaces of the externally profiled shape. Furthermore, a coextruding head is provided, having an extruder for coextruding a tube around the pipe, the coextruding head having a partial vacuum connecting line for the tube and the outer surfaces to be welded together under the difference pressure between ambient pressure and partial vacuum.
Hegler Ralph-Peter
Hegler Wilhelm
Hegler Ralph-Peter
Marks & Clerk
LandOfFree
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