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Reach me NowCombining dry ingredients is one of the oldest unit operations in the processing industries. Over the years, many different types of equipment have been developed to homogenize dry materials, including powders. Let's look first at some common definitions used in describing powder mixers.
As the name suggests, powder mixers are various types of sanitary mixers used to either:
While the focus of this article will be primarily on mixing powders into liquids, there are mixing technologies which are common to both applications.
Commonly used in the dairy, food, and beverage industries, powder mixers may be either batch-type or continuous feed. And, they rely on two different mixing technologies, depending on the physical properties of the powder being mixed.
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In the case of powders which are relatively incohesive'that is, without particles that easily stick together'a convective mixing process, such as that found in the ribbon mixer described below, may be used to thoroughly combine the dry ingredients.
When materials are cohesive, though'prone to sticking together, as is the case with fine powders, and also with wet materials'then a more intensive mixing process is required using either impact force or shear force to thoroughly combine ingredients. The high shear mixers and liquifiers described in later sections of this article are examples of these intensive-type mixers.
There are a couple of operating parameters that impact the productivity of powder mixing. As a general rule, sanitary processing plant operators will seek to achieve as short a mixing time as possible to increase their line productivity. The greater the volume of the powder to be mixed, the longer the time required to blend them together. However, doubling the volume does not necessarily mean doubling the mixing time.
Higher mixing speeds will generally result in shorter mixing times. However, it is essential to note that using excessive mixing speeds with some powders can result in particle breakage and affect product consistency, so processors must consider this factor when mixing.
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