of the solution and simultaneously serves as a buffer to equalize demand fluctuations of the potential consumer the twin screw unit is followed by a safety filter situated between two pumps the pumps and the safety filter are designed in such a way that a shear gradient of 5 1 s is not exceeded the pressure difference between the filter inlet and outlet is measured recorded and achieves values in undisrupted operation which differ only insignificantly from zero in another embodiment of the apparatus according to the present invention the kneading mixing reactor used is an opposite rotating processor in which the kneading mixing screws of the reactor rotate in opposite directions the invention will be further illustrated with reference to drawings and examples fig1 shows the apparatus according to the present invention comprising the kneading mixing reactor 1 having heating cooling zones 1 1 and 1 2 and a drive unit 1 3 the vacuum station 2 the metering units 3 4 5 the screw conveyor 6 the safety filter 7 the feed pumps 8 9 and the consumer 10 the kneading mixing reactor used was a u201c list crp 63 batch co rotating processor u201d having two heating cooling zones 364 g min of comminuted enzymatically pretreated and stabilized cellulose cuoxam dp 540 molecular dispersity u u03b7 5 8 water content 49 0 via an open loop control piston pump and 1 405 g min of preheated nmmo water content 16 0 at 85 u00b0 c via an open loop control unit made up of pump and closed loop control valve are metered in succession a minimal interval apart into the first shearing zone of the reactor pronounced shearing under.