Process for making a cellulose triacetate photographic film base

Details Process for making a cellulose triacetate photographic film base Process for making a cellulose triacetate photographic film base

1996-01-29

1997-11-18

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

26419219, 264207, 26421111, B29C 4126, B29C 3366

Patent

active

056884559

ABSTRACT:
A method of making a cellulose triacetate photographic film support by forming a dope solution of cellulose triacetate in a first solvent, passing the dope solution under pressure through a sheet forming die zone having an upper and lower surface and two edge surfaces, injecting a second solvent into the dope solution at the edge surfaces within the die zone in an amount sufficient to form a slip layer at the two edge surfaces, exiting the dope solution from the sheet forming die zone and separating the solvent from the cellulose triacetate.

REFERENCES:
patent: 2295280 (1942-09-01), Fordyce
patent: 2295394 (1942-09-01), Fordyce et al.
patent: 5393476 (1995-02-01), Suzuki

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