Choke ring for pipe extrusion die

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

1977-07-21

1979-11-06

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including auxiliary shaping means associated with molding...

138177, 425467, B29D 2304

Patent

active

041734467

ABSTRACT:
In the extrusion of plastic pipe in which polymer flows from an extruder into a spreader cone, through a plurality of channels in a distribution 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 passage 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 passage 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.

REFERENCES:
patent: 3694123 (1972-09-01), Cook et al.
patent: 3745200 (1973-07-01), Geter
patent: 4025274 (1977-05-01), Uemura et al.

Affiliated with

Also associated with

Rating

Choke ring for pipe extrusion die does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Choke ring for pipe extrusion die, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Choke ring for pipe extrusion die will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-460521