Process for extruding films of thermoplastic polyester film-form

Details Process for extruding films of thermoplastic polyester film-form Process for extruding films of thermoplastic polyester film-form

1979-11-01

1981-06-09

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624418, 15624419, 156267, 264145, 264176R, 4251311, 4251335, 425462, B29D 702

Patent

active

042723124

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 feeding a small amount of a polymer which is readily processable with the polyester into the extruder die in the area near the edges of the elongated die opening. The different polymers commingle at the edge portions and thereby provide a controllable edge. In the preferred embodiment, a small amount of a low-to-high density polyethylene is injected into the film-forming die near the edge portion of a stream of polyethylene terephthalate prior to extrusion. The resulting milky-appearing edges are preferably cut from the film, and the film is then adhered to a paperboard substrate.

REFERENCES:
patent: 3535409 (1970-10-01), Rohde
patent: 3557262 (1971-01-01), Mitchell et al.
patent: 3629037 (1971-12-01), Masuda et al.
patent: 3652371 (1972-03-01), Hirata
patent: 3737354 (1973-06-01), Hattari
patent: 3909170 (1975-09-01), Riboulet et al.
patent: 4093486 (1978-06-01), Honkaven et al.

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