Abstract: The invention relates to a screw compressor for compressing matter that passes through the screw compressor. The screw compressor comprises a screw having an outer thread with a pitch that decreases in the longitudinal direction of the screw, and a casing that encases the screw. The casing has an inner side that faces the thread of the screw so that matter may be passed ahead through the screw compressor between the screw and the inner side of the casing in a direction from an inlet end of the screw compressor, where the pitch of the screw thread is greater, to an outlet end of the screw compressor, where the pitch of the screw thread is smaller. Appliances are arranged on the inner side of the casing to prevent matter that passes through the screw compressor from rotating along with the screw. Inside the screw, a conduit is arranged for introduction of liquid. The invention also relates to a method for compressing and dewatering.

Abstract: The invention relates to a screw compressor (1) for compressing matter (2) that passes through the screw compressor (1). The screw compressor comprises a screw (3) having an outer thread (4) with a pitch that decreases in the longitudinal direction of the screw (3), and a casing 5 that encases the screw (3). The casing has an inner side (6) that faces the thread (4) of the screw (3) so that matter may be passed ahead through the screw compressor (1) between the screw (3) and the inner side of the casing (5) in a direction from an inlet end (7) of the screw compressor, where the pitch of the screw (3) thread (4) is greater, to an outlet end (8) of the crew compressor (1), where the pitch of the screw (3) thread (4) is smaller. Appliances are arranged on the inner side of the casing to prevent matter that passes through the screw compressor from rotating along with the screw (3). Inside the screw (3), a conduit (10) is arranged for introduction of liquid.

Abstract: The invention relates to an apparatus for debarking logs individually with the aid of high-pressure water jets. The spray nozzles are intended to spray water in focused jets against the log at the same time as the log moves past the spray nozzles. The invention is characterized by a ring (22) through which the log is intended to be fed, in that units (42, 46, 46') are mounted on the inside of the ring, uniformly distributed about the periphery of the said ring, which units are intended to bear against the surface of the log passing through the ring, in that a spray nozzle (40) is arranged in each such unit, which spray nozzle is made to maintain an essentially constant distance from the surface of the log by means of the fact that the unit bears against the surface of the log, this distance lying within a range of distance from the surface of the log which is optimal for debarking.