Extrusion head having a rotating die

Details Extrusion head having a rotating die Extrusion head having a rotating die

2004-05-19

2008-03-04

Gray, Jill (Department: 1774)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S381000, C425S382300, C425S462000

Reexamination Certificate

active

07338271

ABSTRACT:
A crosshead assembly for forming extruded shapes from molten polymer. The assembly includes body sections, a mandrel, a choke ring, and a tip holder for admitting, turning, and accelerating molten polymer toward a novel rotatable die sub-assembly. The die sub-assembly includes a hub, axially-loaded duplex ball bearings, and a pulley for rotating the sub-assembly. The choke ring extends into the die sub-assembly, and a cylindrical seal element is disposed therebetween. A changeable extrusion tip is threaded onto the second cylindrical portion of the tip holder. A die in the sub-assembly is specific to the shape to be extruded. For forming a spiral ribbon and a skin layer on core material, the die opening is a circular central aperture and a radial slot. Multiple ribbons may be extruded simultaneously by using multiple slots.

REFERENCES:
patent: 3067084 (1962-12-01), Nalle, Jr.
patent: 3376605 (1968-04-01), Beattie
patent: 3620883 (1971-11-01), Nalle et al.
patent: 3752614 (1973-08-01), Bremer
patent: 3884753 (1975-05-01), Nalle, Jr.
patent: 4690627 (1987-09-01), Sebille
patent: 6669458 (2003-12-01), Guillemette et al.
patent: 7128862 (2006-10-01), Wang
patent: 2002/0106417 (2002-08-01), Guillemette et al.
patent: 2003/0100869 (2003-05-01), Wang

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