Method and apparatus for controlling a modification process of hygroscopic material

An apparatus for controlling a modification process of hygroscopic material, the apparatus comprising:

• a control unit configured to control the modification process of the hygroscopic material by
• measuring at least one process variable from the modification process at least during the modification;
• measuring at least one process variable from the hygroscopic material at least during the modification;
• calculating at least one intermediate control parameter by a neural network by using at least the measured process variables as input parameters of the neural network;
• controlling the modification process by using genetic algorithms and genetic programming based on the said at least one intermediate control parameter determined by the neural network.