the invention relates to a device which is used to continuously filter material mixtures , in particular for separating impurities from plastic melts . the device includes a hollow cylindrically - shaped filter element which is arranged inside a housing , an annular chamber which is defined from the outside of the filter element and an inner wall of the housing , and at least one stripper which can be pressed onto the filter body by means of an adjusting device . the stripper is used to remove the impurities detained on the filter element due to a relative movement of the filter element and the stripper . the adjusting device contains a pressure sensor which is used to detect the pressure of the material mixture upstream from the filter body and an actuator which is connected to the pressure sensor , said actuator being used to adjust the pressure of the stripper according to the pressure detected by the pressure sensor .