Process for producing cellulose triacetate films

Details Process for producing cellulose triacetate films Process for producing cellulose triacetate films

1991-07-26

1993-02-23

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

34110, 34113, 264 39, 264207, 264217, 26421111, B29C 4126, B29C 4144

Patent

active

051887886

ABSTRACT:
A process for producing cellulose triacetate films that is capable of not only suppressing the growth of foreign matter on transport rollers, but also markedly reducing the necessary number of cleaning operations. The process includes steps of casting a solution of cellulose triacetate onto a support having it surface cooled at 20.degree. C. or below, drying and cooling the solution cast onto the support to solidify the cast solution, separating the subsequently solidified film from the support, and transporting the film while it dries on transport rollers. In accordance with the invention, for a weight proportion of the solvents in the film as separated from the support of at least 40 wt %, the surface of the transport rollers is made of a material having a surface energy of no more than 80 dynes/cm at 20.degree. C.

REFERENCES:
patent: 2319052 (1943-05-01), Fordyce et al.
patent: 2607704 (1952-08-01), Fordyce et al.
patent: 2739069 (1956-03-01), Fordyce et al.
patent: 3239652 (1966-03-01), Price
patent: 4026978 (1977-05-01), Mungle et al.
patent: 4541972 (1985-09-01), Wermik

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