Thermoplastic film extrusion process employing die with filterin

Details Thermoplastic film extrusion process employing die with filterin Thermoplastic film extrusion process employing die with filterin

1985-11-06

1987-07-21

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

264563, 2642091, 2642098, 425190, 425197, 425199, 425205, 425206, 425207, 425376B, 425467, B29C 4720

Patent

active

046817212

ABSTRACT:
An annular extrusion die for the production of a tubular thermoplastic film web material, such as an annular extrusion die including a filtering arrangement for the formulation of a more consistently or uniformly distributed polymer melt conveyed to the die orifice of the extrusion die which will impart improved properties to the extruded thermoplastic film material. Also disclosed is a method of producing an improved extruded thermoplastic film web material through the utilization of the inventive extrusion die arrangement. A cavity or die flow chamber within the body of the annular extrusion die is filled with a particulate inert material of either uniform granular size or of random sizes, so as to force the polymer melt being conveyed towards the die orifice to randomly flow through the interstices which are present between the particles of the granular material, and thereby uniformly fill the cavity.

REFERENCES:
patent: 3419938 (1969-01-01), Sonia et al.
patent: 3847524 (1974-11-01), Mott
patent: 3861843 (1975-01-01), Keuchel et al.
patent: 4085174 (1978-04-01), Ishikawa et al.
patent: 4541793 (1985-09-01), Lindqvist
patent: 4562022 (1985-12-01), Li et al.

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