A method for directly preparing a foamed polylactic acid (PLA) product from a PLA melt includes PLA melt preparation, feeding, and two-stage extrusion. In the two-stage extrusion, a pressure at an outlet of a first-stage twin-screw extruder is 15 MPa to 17 MPa, a PLA melt is fed at a rate of 250 kg/h, a foaming additive is fed at a rate of 7.5 kg/h to 10 kg/h, and a foaming gas is fed at a rate of 2.8 L/h to 7.5 L/h. The method can ensure both foamability and quality of a material and reduce more than of energy consumption; and an obtained product has an adjustable foaming rate of 3 to 25, a crystallinity of 40.3% to 48.5%, a tensile strength of 8.7 MPa to 19.6 MPa, and an apparent density of 0.05 g/cm.sup.3 to 0.4 g/cm.sup.3.

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.