Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – With prevention of equipment fouling accumulations or deposits
Patent
1992-09-30
1995-02-28
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
With prevention of equipment fouling accumulations or deposits
264 39, 264217, 425224, 425225, B29C 4128
Patent
active
053934768
ABSTRACT:
A method for producing a film or sheet of a cellulose ester such as cellulose triacetate (TAC), cellulose diacetate, or the like, in which a film-forming solution is extruded through the slot of an extrusion die onto a support while a liquid is dropped at opposite ends of the die onto the flow of the film-forming solution emerging from the slot, thereby to prevent slugging of the solution, wherein a solvent contained in the dropping liquid contains a poor solvent for a solute in the film-forming solution in an amount in a range of from 30% to 90% by weight relative to a good solvent for the solute contained in the dropping liquid. With the invention, slugging is prevented and production efficiency improved without adversely affecting the formed film, without problems in separating the film from the support due to insufficient drying, and without requiring periodic cleaning of the support or reduction of the film production rate.
REFERENCES:
patent: 2051201 (1936-08-01), Davidson
patent: 2221019 (1940-11-01), Clarke
patent: 2249507 (1941-07-01), Van Derhoef
patent: 2369484 (1945-02-01), Nadeau
patent: 3032817 (1962-05-01), Czerkas
patent: 3112528 (1963-12-01), Czerkas
patent: 3502757 (1970-03-01), Spencer
Fuji Photo Film Co. , Ltd.
Vargot Mathieu D.
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