Abstract: A press for the expression of liquid from liquid-containing substances, comprising a stationary container 2 which has a filling opening 3 and an emptying opening and a rotating screw conveyor 4 made up of a screw shaft 6 with screw-vanes 5, located in the interior of the container. The screw conveyor is covered over by a flexible membrane 13 secured in pressure tight fashion to selected portion of the screw conveyor to rotate therewith. Pressure means flows in the space 15 between the conveyor screw shaft 6, the membrane 13, and the screw vanes 5 so that pressure is exerted on the liquid containing substances located in pressing space 16.

Abstract: A press for squeezing juice-containing materials, like grapes, fruit-mashes and the like, by a closed container rotatable around its longitudinal horizontal axis, whereby a filling opening, covered by a perforated sheet, is provided in the jacket of the container and a pressure membrane made of flexible or elastic material matching the shape of the container is provided inside the container at the edge of the filling opening and is fastened parallel to the plane passing through the axis of rotation, said membrane dividing the interior of the container into a pressure medium and a pressure space. A loosening and draining device is provided in the pressure space inside the container opposite the filling opening and opposing the pressure membrane.