Posted by
useongroup on Tuesday, May 12, 2009 2:45:41 AM
Twin screw extruder Two
screws, side by side, are placed within the extruder barrel; they are
either counter-rotating or co-rotating. Counter-rotating twin screw
extruders are used primarily for processing PVC products such as pipe,
siding, sheet, pellets, and film. The co-rotating units are used for
compounding materials where thorough mixing and high output rates are
important. The twin screw unit resembles a positive displacement screw
pump. It conveys the material at low speeds with controlled shear. The
positive action assures that all portions of the material experience a
uniform residence time.