Continuous extrusion pressing of particle mixtures, e.g. wood chips or shredded paper waste, uses a compression member with a single screw flight

摘要

A mass of small particles is compressed and extruded by a screwed compression member (102) with a single flight covering less than 360 [deg], optionally with an undercut. Feeding can be by gravity or vibrating chutes. An increase in compression can be obtained by decreasing the screw pitch. The compression member (102) can also be driven to reciprocate or swing in an arc in addition to its rotation. Control is arranged through the forces required by the hydraulic drive and the depth of penetration of a central spigot (110), through which water or steam can be supplied or withdrawn. The heated duct (114) following the extrusion stage is according to .