Funnel member for single-screw extruder

Details Funnel member for single-screw extruder Funnel member for single-screw extruder

B - Operations, Transporting

29

C

18/733

B29C 47/62 (2006.01) B29C 47/58 (2006.01)

Patent

CA 1212806

ABSTRACT OF THE DISCLOSURE The funnel member of a single-screw extruder comprises a housing and a feed screw which passes at least partially axially therethrough and is sealed from the drive shaft by a return feed screwthread covered by a bushing which is fixed with respect to the housing. The feed screw is enveloped by a grooved sleeve having take-in grooves which are parallel to the axis and become shallower in the feeding direction. For charging the material, the funnel member is provided with an eccentric filling aperture tangential to the feed screw. To reduce torque and pressure caused in the charged thermoplastic masses by the threads of the screw running past the single aperture, the grooved sleeve is provided with take-in grooves over its entire circumference only in the zone upstream of the filling aperture and, in the region of the filling aperture , is provided with take-in grooves only in the part substantially radially opposite to the filling aperture

432231

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