...by piston, rolls, or screw (auger), respectively.

A ram extruder is a piston inside a cylinder. The piston must be retracted to charge the hopper before it can be extended into the barrel. Once charged, material is moved by the piston or plunger into the barrel and compressed against the die, creating pressure. Ram extrusion is intermittent due to this basic functionality.

A pellet mill typically employs two rolls inside a cylinder. The rolls are attached to an arm that rotates on the axis of the cylinder, and this causes the rolls to rotate against the cylinder's inner diameter where the die plates are mounted. Product is introduced to the cylinder and forced through the dies with this rolling action. Pellet mills deliver continuously, but equipment size becomes an issue when significant throughput is required.

Screw-type extrusion incorporates an auger inside a...

NOTE: All illustrations and photos have been removed from this article.



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