Patent ID: 6972101

Claim:
A process for the regulation of the composition of solution(s) for the manufacture of cellulosic mouldings, comprising: (a) mixing cellulose pulp and water containing aminoxide to form a cellulosic suspension in a mixing apparatus equipped with metering elements; (b) moving the cellulosic suspension from the mixing apparatus to a first evaporation device and evaporating water from the cellulosic suspension to form a cellulose solution; (c) moving the cellulose solution from the first evaporation device to an extruding device and measuring a non-optical property of the cellulose solution for adjusting concentrations of the cellulosic suspension by means of the metering elements in stage (a) and/or the cellulose solution in the evaporation device of stage (b); (d) extruding the cellulose solution through an air gap into a precipitation bath, which contains an aqueous aminoxide solution wherein the cellulose solution coagulates to form mouldings and removing at least some of the aqueous aminoxide solution from the precipitation bath to a second evaporation device for evaporating to a predetermined aminoxide concentration for reintroduction into the mixing apparatus; (e) introducing and conducting the formed mouldings through a washing bath wherein an aqueous washing solution washes out remaining aminoxide from the mouldings; and (f) moving at least some of the aqueous aminoxide solutions-from the washing bath stage (e) and measuring at least one non-optical property in the aqueous aminoxide solution before the aqueous aminoxide solution is reintroduced into the precipitation bath, and wherein a measured values-of the non-optical properties is used for regulating the composition of the aqueous aminoxide solution according to the deviation of the measured value of at least one non-optical property in the aqueous aminoxide from a given value determined from a standard aqueous aminoxide composition wherein the measured non-optical property of the aqueous aminoxide solution is selected from the group consisting of: dielectricity constant, inductive conductivity, microwave absorption, density, water content and ultrasonic speed.