Patent ID: 7922947

Claim:
A method of producing a cellulose acylate dope, comprising steps of: continuously supplying cellulose acylate and a solvent into a disperser; feeding said cellulose acylate and said solvent through said disperser in a retention time of 1 second to thirty seconds before said cellulose acylate is swelled, so as to disperse said cellulose acylate in said solvent to obtain a dispersion; continuously supplying said dispersion into a shearing device; swelling said dispersion in said shearing device by retaining said dispersion in said shearing device for at least 30 seconds to obtain a swelling solution; supplying said swelling solution into a dope production apparatus; and heating said swelling solution by said dope production apparatus and dissolving said cellulose acylate in said dope production apparatus to obtain a dope of said cellulose acylate.