A method for operating a filter device for polymer melt to be filtered, said filter device incorporating at least one first large-area filter, which has a plurality of filter elements, in a first filter chamber; and a first drain for the filtered polymer melt from the first filter chamber. The polymer melt to be filtered is conveyed under pressure through the filter device. The polymer melt to be filtered is fed to the first large-area filter in the filter direction, and filtering is continuously performed via the first large-area filter. During a backflushing operation, at least one filter element is cleaned of impurities and backflushed by reversing the flow direction of the filtered polymer melt and passing it through the filter element.

A filtering device for plastic materials in a molten state includes two filters made of a metal mesh and arranged side by side inside a filtration chamber, and a cleaning device between the two filters, the cleaning device in turn including one or more pairs of main hollow bodies provided with adhering walls that adhere to the filters or holed supports of the filters.

A device may include a housing having a receptacle for receiving a screen carrier, and having a fluid inlet channel and a fluid outlet channel. In addition, the device may include a screen carrier movably received inside the receptacle and having a screen carrier inlet, a screen carrier outlet and a cavity for receiving a filter element, where the cavity is in fluid communication with the screen carrier inlet and the screen carrier outlet. The screen carrier can be moved from a screen replacement position(S) via a venting position area into a filtering position (F). Moreover, the device may include an accumulator which is fluidically connectable to the screen carrier inlet and/or to the screen carrier outlet and which is configured to store fluid that is fed via the screen carrier inlet and/or the screen carrier outlet and to control a feeding of the fluid into the accumulator.