--, self-clean --.2kinds of screws,single screw and twin screw. The ... /minPL-SF6058740-400r/minPL-SF90901240-400r/min -- No stagnant zones,self-cleaning-- Side Feeder can be mounted anywhere on the extruder ... system is characterized by twin-screw extruder without dead ends, self-cleaning effect. Side of the feeding system can be installed ...