Foam sheet extrusion die apparatus, and system with adjustable c

Details Foam sheet extrusion die apparatus, and system with adjustable c Foam sheet extrusion die apparatus, and system with adjustable c

1994-12-05

1997-04-22

Warden, Jill

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Adjustable shaping orifice or shape imparting insert member

425467, 4253824, B29C 4722, B29C 4786

Patent

active

056227329

ABSTRACT:
An extruder die apparatus, for the extrusion of a thermoplastic material, which die apparatus has an adjustable choke ring. The apparatus comprises an extruder housing having an axial bore for the extrusion of thermoplastic material therethrough from the inlet to the outlet of the bore, an inner die lip and an outer die lip about the bore and within the housing, the lips forming a concentric die gap passageway for the extrusion of a thermoplastic material from the one to the other end of the die, and a choke gap within said thermoplastic material flow passageway having a movably positioned choke ring. The choke ring has a plurality of individual, axially extending castellations thereon, some having oval receiving holes therein. These separate, castellated sections may be adjusted incrementally and independently by a plurality of eccentric bolts extending through the housing and the oval receiving holes, to provide selected areas within the choke gap having a restricted cross section thermoplastic material flow area. The restricted choke gap provides for an improved distribution of the thermoplastic material being extruded through the choke gap prior to being extruded through the die gap.

REFERENCES:
patent: 3767346 (1973-10-01), Mihalik
patent: 3899276 (1975-08-01), Sokolow
patent: 4212620 (1980-07-01), McLaren
patent: 4362683 (1982-12-01), Otsuka et al.
patent: 4882104 (1989-11-01), Dobrowsky
patent: 5102602 (1992-04-01), Ziegler
patent: 5108683 (1992-04-01), Anand

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