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When to use a dual-shaft mixer?

When to use a dual-shaft mixer?

When to use a dual-shaft mixer?

Consider using a dual-shaft mixer for:


· High solids formulations. The disperser shaft can be equipped with two blades: one blade that is fixed at the lowest point of the shaft and another (of equal or smaller diameter) that is adjustable along the length of the shaft. The supplementary upper blade helps create a more powerful vortex to quickly draw large amounts of solid ingredients into the liquid phase. It is typically positioned one blade diameter below the liquid surface.

· Vacuum mixing requirements. The laminar bulk flow induced by the anchor in a dual-shaft mixer assists in breaking up air pockets within the batch during vacuum application. This helps to control the liquid level and prevent product from rising to the mixer cover.

· Sanitary or sensitive applications. Unlike counter-rotating mixers with bottom-entering agitators, dual-shaft mixers offer better protection against contamination because there are no agitator seals or bearings submerged in the product zone.

Thick emulsions. A dual-shaft mixer equipped with an anchor agitator and a rotor/stator assembly (which could be interchangeable with the disperser blade) is recommended for viscous emulsions with relatively low solids content. A candidate formulation may be one that could be processed using a stand-alone rotor/stator but would benefit from improved temperature control or processing under vacuum. The impact could be as dramatic as cutting processing time in half, especially if a cooling cycle is involved.


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