Abstract: An extrusion device used for extracting liquids from liquid-solid mixtures and which operates on the separation gap principle, comprising a screw rotating in a barrel. Pins project radially inwardly into the barrel. The separation gaps and the internal lining of the barrel are maintained in an operationally efficient state for long periods of time even if highly abrasive and/or corrosive mixtures are being treated. The internal surface of the hollow barrel is lined with individual, interchangeable segments which are peripherally staggered relative to one another in the form of a wall, end face or tip portions are located on the end portion of the pins. Moreover, the screw comprises a mandrel on which are mounted individual screw flight portions. Between the flight portions, ring portions are mounted on the mandrel. These ring portions and the tip portions mounted on the pins define the separation gaps. Accordingly, those parts which are liable to wear or corrode can be readily replaced.

Abstract: A flange connection for connection in series hollow cylinder barrels forming a screw press. The cylinder barrel is formed with a groove adjacent one end thereof, and radially reduced, stepped portions of flange ring halves are positioned in the groove. Bore holes are formed at the abutment line between the flange ring halves and the external surface of the barrel, and pins are inserted in the bore holes. In this manner, radial, axial and rotative movement of the ring half is prevented, without the need for welding or otherwise permanently securing the connection.

Abstract: A worm press for mechanically separating liquid/solid mixtures comprising a feed region and a pin-barrel pressing region. The worm has at least one flight, each of which flights is interrupted so as to enable the flight to pass the stationary pins in the pin-barrel region. The downstream ends or points of the worm flight portions formed by the interruptions are specially shaped in order to increase considerably the strength and service-life of the highly stressed points. This is achieved by reducing the size of the thrust flank, so that the flank subtends an angle of from 20.degree. to 50.degree. relative to the line perpendicular to the worm axis. Desirably, the thus-angled profiled tip region of the flight portions are interchangeable.

Abstract: An extraction device for treating liquid-solid mixtures such as sewage sludge or paper pulp to remove liquid therefrom, includes a preliminary treatment station. The preliminary treatment station comprises at least two interchangeable perforated containers located on a displaceable receiver turntable beneath which a stationary disc is coaxially located. The stationary disc is provided with an aperture eccentrically disposed thereon, the aperture having a cross-sectional area corresponding to the cross-sectional area of the lower end of the container located on the turntable and to the cross-sectional area of an inlet aperture provided in the extraction device.By rotating the receiver turntable in a timed sequence a container is always moved beneath a filler tube, filled and further rotated. The solid components drop to the bottom of the container and liquid is discharged through the perforations provided in the container and the mixture thus has liquid removed in a preliminary treatment.

Abstract: Continuously operable apparatus for the preparation and/or processing of synthetic plastics or rubber moulding compounds, comprising a housing in the form of a channel and a mixing and kneading member engaged in the channel and having a surface which co-operates with the bottom wall of the channel, in which said bottom wall and said surface of the mixing and kneading member are undulatingly profiled in a manner such that the profiles extend transversely or obliquely with respect to the longitudinal axis of said channel and said member, and drive means, including at least one crank drive, coupled between the housing and said member to cause said member and said housing, while retaining their respective orientations to move relatively to one another to cause the peaks of the undulations on one of said surface and said bottom wall to perform a circular movement in associated valleys in the other of said surface and said bottom wall.