Hollow tube in which plastic is gradually heated and melted. Inside the barrel is a helical screw which compresses and moves the plastic from the feed throat (hopper end) to the manifold and die head(s). Outside the barrel are band heaters.
Barrel Lining - Centrifugal cast boron alloy or nitrided integral surface of the barrel bore.
Barrel Liner - A removable boron alloy or nitrided sleeve pressed or shrunk into the barrel bore.
Barrel Vent - An opening through the barrel wall , intermediate in the extrusion process, to permit the removal of air and/or volatile matter from the material being processed.
Barrel Flange - For attaching a melt pipe, die head, accumulator head or nozzle.