However, just because foaming is expected to occur does not mean it cannot be managed or at least minimized. The presence of surfactants can cause or exacerbate foaming but they often play a number of essential functions in the formulation and so are typically indispensable. The higher the agitator or blade speed, the better the mixing but also the greater the amount of foam created and the more the air entrained within the batch. In many applications, it is an unavoidable side-effect of mixing, shearing and powder incorporation. Different applications call for different solutions, including addition of chemical defoamers, mixing under vacuum and high-speed sub-surface powder induction.įoaming is a very common mixing issue. Foaming and air entrapment are common phenomena encountered in many mixing processes.
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