preset desired values x desired tg target activation occurs of at least one of the last dewatering units en 1 through en x of forming section 1 located prior to dewatering unit en and thereby preset control variables y 9 n 1 x f x desired tg target whereby x is consistent with the maximum number of dewatering units e inside compression zone vz fig2 b illustrates the integration of the inventive controls into a regulating system whereby the actual value x actual tg target is continuously determined besides the predetermined desired value x desired tg target and the individual control variables y 9 n 1 x are formed for actuating the dewatering units en 1 through en x which are located prior to the last dewatering unit the last dewatering unit en in direction of travel is operated at the maximum possible drainage capacity the control variable y 9 n remains constant for the control in other words it remains unchanged or respectively is determined according to the maximum capacity because of the continuous comparison the drainage behavior on dewatering units en 1 x which are located prior to the last dewatering unit can be controlled and regulated in such a way that their drainage capacities are lowered and by utilizing the maximum theoretical possible drainage capacity the maximum possible drainage effect is achieved with the last dewatering unit en here the inventors have made use of the knowledge that u2014 with predetermined vacuum strength on one of the dewatering units e in the embodiment of suction devices u2014 the dry content development in the sheet compression zone and thereby the drainage effect can be described through an exponential function for the dewatering unit e this is as.