Abstract: A screw press (1) for pressing fibrous material, in particular sugar beet pulp, comprising: at least one pair of helical elements (30) which are disposed mutually parallel and side by side and comprise at least one helix (32, 33) disposed about a rotary shaft which extends along a predetermined axial direction; a perforated walled filtering cage (5) supported by equidistant hoops (13, 14) and enclosing said helical elements (30) as an exact fit; a loading hopper (8); a discharge opening (9) for the exit of the pressed material; a collection sump (10) positioned externally to said filtering cage (4); in which said filtering cage (5) presents a modular structure having a distance between the axes of each module (M) which is constant and is a sub-multiple of, or equal to, the dimension of the loading hopper (8) measured along said predetermined axial direction, said loading hopper (8) being shiftable by its replacing one or more modules (M) of the filtering cage (5).

Abstract: A screw press (1) for pressing fibrous material, in particular sugar beet pulp, comprising:—a pair of adjacent counter-rotating shafts (20, 30) having their axes (X-X, X?-X?), disposed parallel to each other, said shafts (20, 30) each being provided externally with a helical structure winding in the opposite direction to the helical structure of the other shaft;—a perforated walled filtering cage (4) enclosing said helical structures (21, 31) as an exact fit;—a loading hopper (10) for feeding the fibrous material to the press (1);—a discharge aperture (11) for the exit of the pressed material;—a collection sump (12) positioned externally to said filtering cage (4); in which each box-like helical structure (21, 31) comprises a helix (22, 32) and a helical element (23, 33), comprising at least one perforated surface (24, 34) and forming a helical interspace (27, 37) with the outer surface of the shaft (20, 30), said perforated surface (24, 34) having a length (L) along the axis (X-X, X?-X?) of the shaft (20, 30

Abstract: A screw press for squeezing out liquid from a fibrous material including a screen cage having an inlet for the material to be pressed and an outlet for the pressed material, a pair of parallel Archimedean screws, rotatably arranged inside the screen cage, each of the Archimedean screws having a main thread extending around a shaft with a height and a pitch decreasing in the direction from the inlet towards the outlet. Around each shaft and between the turns of each main thread, an auxiliary thread is provided having a reduced height with respect to the height of the main thread, and the auxiliary thread of an Archimedean screw is arranged close to the main thread of the other Archimedean screw at least along the portion of the main thread having a lesser height.