Foaming and air entrapment common to mixing processes

Jongia Mixing Technology has initiated many mixing processes worldwide with its agitators. In some of these mixing processes, the elimination of foam that can arise from the behavior of the recipe is essential as well. Because when foaming can be avoided, the stirring process will run much more smoothly, greatly reducing production times!

Foaming in the mixing process

In many applications, foaming is an unavoidable side-effect of stirring processes, for example when mixing at high speeds and when mixing powders. The higher the agitator mixing element speed, the better the mixing effect. However, this also increases the amount of foam which can then lead to more air entering the liquid.

Next to that, often a decisive factor in foaming is the presence of additives that can even aggravate it. However, these substances usually have an essential function in the recipe and are therefore indispensable in the process.

Importance of the right agitator

Although the chance of foaming exists, its effect can certainly be controlled or at least minimized. To this end, choosing the right agitator mixing element is essential. After all, excessive foaming can seriously disrupt the mixing process as it can lead to longer cycle times, difficulty in recipe handling, lower productivity, product loss, and extensive cleanup.

Additionally, trapped air left in the recipe can cause structural problems, cloudiness, discoloration, voids, instability, and other undesirable characteristics. It certainly has a major impact on the final product.

There are of course certain anti-foaming agents that one can add to prevent or even eliminate foam. However, these come with their own disadvantages. The main disadvantages of using anti-foaming agents are the high cost and the fact that in some products these can negatively affect the recipe of the product.

The best way to avoid using chemical defoamers

Below are some simple steps that can prevent or greatly reduce foaming:

Reducing the vortex that can occur from the agitator mixing element;

  • Reducing the speed of the agitator as soon as the agitator mixing element and the liquid level get too close to each other;
  • Proper positioning of the Top-entry agitator in the tank;
  • Proper positioning of the Side-entry agitator in the tank;
  • The selection of the agitator mixing element itself can have a major impact on foaming.

Based on the above list it can be said that an agitator manufacturer should give the right advice when it comes to preventing foaming. This does need to be based on the correct input of data that is available or can be experienced via a test setup.

Jongia Mixing Technology has extensive experience in various situations where the prevention of foam has been of great importance for the reduction of production times in stirring processes, or even for preventing the selection of extra-large tank volumes to accommodate for the foam. Such savings indicate that a specialist like Jongia can best advise your process.

Want to know more?

As with all products to be mixed, preventing or reducing foaming certainly requires a specific approach. Jongia Mixing Technology has all the knowledge and experience to provide you with comprehensive product advice. Do you have any questions? Please do not hesitate to contact us.

Contact our specialized team for all your questions

Kevin van Geffen

Area Sales Manager


Area Benelux

Technical Questions?

Jaap Grijpma

Application Engineer

Technical Specialist

Sijko van der Veen

Application Engineer

Technical Specialist


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