A retruder having a housing with a pair of counter-rotating worm gears axially mounted within said housing for counter-rotation to process a medium. The housing has an inlet and also an outlet through which the processed medium is discharged which is transverse to (radially of) the housing axis. An insert...http://www.google.com.au/patents/US5603564?utm_source=gb-gplus-sharePatent US5603564 - Housing for twin worm-gear press with internal insert to reduce wear of housing
