EXTRUDER Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: extruder has housing with vent opening and worm divided into mastication, extrusion and degassing zones, with straining device formed as perforated cylinder embracing worm and scraper-type member. Scraper-type member has at least one spiral tape located in annular channel between housing inner surface and perforated cylinder outer surface. Spiral tape embraces this surface and comes into contact with it for rotation relative to this tape. Spiral tape is fixed on inner surface of housing with its outer diametrical portion. Spiral tape coils are oriented in direction opposite to that of worm coils. perforated cylinder is rigidly connected with worm and is rotated together with it. Worm diameter in the vicinity of zone of extruding exceeds worm diameter adjacent to mastication and degassing zones. Spiral tape may be provided with faces, and perforated cylinder may have rigidity ribs. EFFECT: increased efficiency and enhanced reliability in operation. 4 cl, 5 dwg