Leakage-free feed roll assembly for an extruder machine

The invention relates to a feed roll assembly for reducing leakage of an elastomeric material in a feed section of an extruder machine. A shell (402), feed roll seal plates (412), and feed roll end plates (422) are used to reduce the leakage of elastomeric material. Elastomeric material is redirected back to the feed section through the use of a varying bore diameter (408, 500, 502) of the shell and grooves (420, 428) contained in both the feed roll seal plates and the feed roll end plates. The shell, feed roll seal plates, feed roll end plates, and a feed roll scraper (320) are each coated with a solid, dry lubricant coating to reduce friction. The invention provides desirable feedback of overflow elastomeric material and permits a retrofitting of the feed roll assembly to existing extruder machines.