Patent ID: 7326376

Claim:
A method of regulating a composition of a cellulose-containing extrusion solution with a pre- and main-regulation step for the production of cellulosic molded articles, comprising: (a) regulating the mass flow of an aqueous cellulose into a mixing vessel, wherein the mass flow is measured with a device using the Coriolis measuring principle and wherein the water content of the aqueous cellulose is known or determined; (b) regulating the mass flow of an aqueous amine oxide solution into a mixing vessel, wherein the mass flow is measured with a device using the Coriolis measuring principle and wherein the water content of the aqueous amine oxide solution is known or determined; (c) producing an aqueous cellulose/amine oxide mixture with a preselected cellulose/amine oxide ratio in the mixing vessel by regulating the mass flow of the aqueous amine oxide solution relative to the mass flow of cellulose; (d) converting the aqueous cellulose/amine oxide mixture to the cellulose-containing extrusion solution by evaporation of water in vacuo at an elevated temperature and by input of shearing energy to regulate the water content to a predetermined level and to maintain a constant cellulose/amine oxide ratio; (e) extruding the cellulose-containing extrusion solution to form the cellulosic molded article; (f) coagulating the cellulosic molded article in a coagulation bath; and (g) washing the cellulosic molded article to remove the residual amine oxide.