Method of an apparatus for producing hollow extrusions

Details Method of an apparatus for producing hollow extrusions Method of an apparatus for producing hollow extrusions

B - Operations, Transporting

29

D

B29D 22/00 (2006.01) B29C 47/20 (2006.01) B29C 47/90 (2006.01)

Patent

CA 2307732

Hollow extrusions are formed by initially extruding a plurality of separate strands adapted to form segments of the completed hollow extrusion in their positions corresponding to the locations of those segments in the finished extrusion. Webs between these strands are then formed by feeding an afterflow of the melt at press pressure into the shaping channel in the calibrator downstream from the die zone so that under the pressure of this melt and the melt heat, the webs fuse to the ends of ribs of the separate strands.

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