Process for the manufacture of polyester film

Details Process for the manufacture of polyester film Process for the manufacture of polyester film

1982-05-27

1984-07-31

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264566, 264569, B29D 706

Patent

active

044629532

ABSTRACT:
The invention contemplates the manufacture of a wrinkle-free, amorphous, unoriented polyester film which is produced by an extrusion blowing process. The process consists of extruding a bubble of polyester, expanding the bubble, and then collapsing the bubble at a temperature above the polyester's glass transition temperature to prevent the formation of wrinkles. The collapsing step is effected through the use of a shroud which receives the bubble and has a low friction surface.

REFERENCES:
patent: 2556295 (1951-06-01), Pace, Jr.
patent: 2578899 (1952-12-01), Pace, Jr.
patent: 2844846 (1958-07-01), Kronholm
patent: 3950469 (1976-04-01), Gneuss et al.
patent: 4010222 (1977-03-01), Shih
patent: 4252512 (1981-02-01), Kornylak

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