Die for extruding large-diameter tubing

Details Die for extruding large-diameter tubing Die for extruding large-diameter tubing

1975-09-24

1977-08-30

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

264209, 425380, B29D 2304

Patent

active

040451542

ABSTRACT:
A tube-making die has an outer tube defining a flow axis and having an inner wall centered on the flow axis. A mandrel is supported within the tube by a plurality of radially extending webs and has an outer wall centered on the die axis and turned toward the inner wall. The walls define an annular axially extending flow chamber that is subdivided by the webs into a plurality of passages. At the juncture between the side walls of the webs and the inner and outer walls of the tube and mandrel, respectively, grooves are formed which extend tangentially of the inner and outer walls and/or radially of the side walls of the web.

REFERENCES:
patent: 3321805 (1967-05-01), Given
patent: 3709645 (1973-01-01), Mraz
patent: 3899276 (1975-08-01), Sokolow

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