Choke ring for pipe extrusion die

Details Choke ring for pipe extrusion die Choke ring for pipe extrusion die

B - Operations, Transporting

29

C

18/741

B29C 47/20 (2006.01)

Patent

CA 1102074

CHOKE RING FOR PIPE EXTRUSION DIE Abstract of the Disclosure In the extrusion of plastic pipe in which polymer flows from an extruder into a spreader cone, through a plurality of channels in a distri- bution plate and through a choke passage for blending the plurality of flow streams from the individual channels in the distribution plate to form the sidewall of an extruded pipe, improved blending and welding of the polymer flow is accomplished by incorporating in the outer wall of the choke pass- age a plurality of elongated cavities with each cavity diminishing in depth and width from its upstream end to reach zero depth and width as the pass- age stretches downstream across the line of polymer flow. In preferred embodiments the cavities are tear-shaped with wall space in between and overlap at least an end of the nearest passage on either side as viewed in the direction of polymer flow.

302412

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