EXTRUDER AND SCREW THEREFOR WITH UNDERCUT MELT CONDUCTING CHANNEL

摘要

A screw type extruder for reducing a solid thermoplastic material to a fluid wherein a spiral body of uniform width of the material is maintained in continuous contact with the barrel of the extruder and the screw is formed with a secondary or subchannel arranged substantially underneath a solid body supported within the main channel for conducting the melted material toward the discharging end of the extruder.