Method for the preparation of plastic film

Details Method for the preparation of plastic film Method for the preparation of plastic film

1974-11-25

1976-11-02

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264103, 264209, 264210R, 264290R, 425326R, B29D 2304

Patent

active

039897850

ABSTRACT:
Film is prepared by a trapped bubble process. The inflated tube of plastic material is subsequently further expanded by trapped internal gas to provide a bubble and orientation of the film. Irregularities in the film are randomized by cyclic rotation of the tube and bubble with a rotating means having a variable speed drive.

REFERENCES:
patent: 2697852 (1954-12-01), Bailey
patent: 2844846 (1958-07-01), Kronholm
patent: 3161942 (1964-12-01), Cheney
patent: 3180909 (1965-04-01), Looser
patent: 3223762 (1965-12-01), Fry, Jr.
patent: 3231651 (1966-01-01), Cheney
patent: 3284552 (1966-11-01), Haley
patent: 3286005 (1966-11-01), Cook
patent: 3450806 (1969-06-01), Matsuo et al.
patent: 3635634 (1972-01-01), Nagano et al.

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