Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1996-10-22
1998-06-09
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264 51, 425466, 425467, B29C 4712
Patent
active
057628483
ABSTRACT:
An extruder die apparatus, system and method 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.
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Crowley Richard P.
Kuhns Allan R.
Sencorp Systems Inc.
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