A combination of rubber stock, carbon black and other chemical ingredients are mixed to create a homogeneous rubber material using pneumatic ram force control.

The QB3 high flow electro-pneumatic pressure regulator is excellent at ram force control on a Banbury Mixer. Generally, air around the Banbury is very dirty. The QB3 operates optimally in standard industrial air filtered to 40 micron. Many competitive products require filteration of less than 5 micron and dry (essentially) instrument air.