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APPARATUS FOR PREPARING POLYMER SOLUTION, APPARATUS FOR PRODUCING POLYMER FILM, PREPARATION OF POLYMER SOLUTION, PRODUCTION OF POLYMER FILM, AND POLYMER FILM
APPARATUS FOR PREPARING POLYMER SOLUTION, APPARATUS FOR PRODUCING POLYMER FILM, PREPARATION OF POLYMER SOLUTION, PRODUCTION OF POLYMER FILM, AND POLYMER FILM
PROBLEM TO BE SOLVED: To make sufficiently dissolvable a polymer to minimize the filtration load by dissolving the polymer in a supercritical fluid in a supercritical state including either a supercritical temperature or higher or a supercritical pressure or higher. SOLUTION: A supercritical fluid obtained by introducing a supercritical-fluid- forming substance from a cylinder 1 through a conduit 2 into a compressor 3 and bringing it into a supercritical temperature or higher or a supercritical pressure or higher by means of a heater 4 is introduced through a valve 5 into a pressure dissolver 6 having a pressure resistance of 50-500 atm. Next, a solvent miscible with the supercritical fluid and a polymer are fed into the dissolver 6, and the valve 5 is shut. The polymer is dissolved under agitation, a regulation valve 7 is opened, and the solution is filtered by introducing it into a filter 9 through a conduit 8 while it is kept in a supercritical state. The solution is introduced into a gas/liquid separator 11 through a pressure reduction valve 10 to release it through 15, and the obtained polymer solution is discharged from a bottom valve 16 of the separator 11 through a conduit 17.
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