Polyester film extrusion with edge bead control

Details Polyester film extrusion with edge bead control Polyester film extrusion with edge bead control

1980-07-23

1982-09-07

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264171, 2642101, 2642102, 2642106, 4251311, 4251335, B29D 702

Patent

active

043483461

ABSTRACT:
Disclosed is an improved process for extruding films of thermoplastic polyester film-forming materials. The process enables extrusion of films with reduced problems of neck-in, edge-weave and beading, by laminar flow feeding a small amount of a polymer into the extruder die in the area near both edges of the elongated die opening. The polymer laps said edge portions and thereby provides a controllable edge, which may be cut from the film after drawing the film from the die, and an increase in the usable film area for a given weight of polymer.

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patent: 3629037 (1971-12-01), Masuda et al.
patent: 3865665 (1975-02-01), Marion
patent: 3909170 (1975-09-01), Riboulet et al.
patent: 4272312 (1981-06-01), Thompson

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