Mixing venting extruder

MRF material recovery facility MVX mixing venting extruder... 

Two-stage and multiple-stage vented extruders are commonly used to remove volatile components from molten resin streams prior to downstream processing. The vent ports can be open to the atmosphere, or they can be attached to elaborate vacuum systems. For very specialized systems, stripping agents such as water, nitrogen, and carbon dioxide can be added upstream of the vent, mixed into the resin stream, and then devolatilized in the vent area. This technique can be employed to remove difficult components or components at a higher rate from the resin. 

The author s design of continuous mixer, the Parrel Bridge Mixing and Venting Extruder— MVX—has two sections, one for mixing (see Fig. 8) and the other for extrusion. 

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