A few years ago, the process of selecting a mixer for most applications was straight- forward.
When increased demand required an increase in production, process engineers were naturally
inclined to choose the type of mixer that had worked before in the same application. When they
began talking to equipment manufacturers, their questions focused on capacity, auxiliary
equipment, projected delivery and price. Many tested equipment before signing a purchase order.
But they were mainly exercising "due diligence" - they were simply looking for proof that the
mixer would work.
When a mixer was needed to produce a new product, the procedure was almost as clear-cut.
Mixers generally fell into distinct categories according to such obvious operating parameters
as the viscosity they could handle. Most manufacturers offer a "selection chart" for their
equipment in order to illustrate the boundaries of each mixer's operation. By tracing rows
and columns on the chart, they could readily identify a mixer that would probably answer
The selection process is more complex today, because the
capabilities of the most widely used mixers have expanded steadily during the last decade.
If you haven't read an up-to-date mixer selection chart recently, take another look. You will
find that the distinction between the mixers listed is now far less conspicuous than the
overlap in their capabilities. This is especially true among heavy-duty mixers capable of mixing
viscosities from 50,000 to 8 million cps (centipoise).