Premix process principle

In principle a liquid additive can be added to polymers anywhere from the base of the hopper to an add-on mixer at the screw tip. In a few cases such as plasticisers with polyvinylchloride (PVC) polymer powder and hydrocarbon oil with styrene/butadiene thermoplastic elastomer pellets, batch premixing can be used, during which the polymer absorbs the liquid. The dry blend can then be processed by the extruder. 

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