Testing a Batch Mixer

For reliable scale-up and extrapolation of test data, it important to maintain geometric, kinematic, and dynantic similarity between the test mixer and the fiill scale mixer. A batch mixer should have access for sampling within the mixer at various mixing times. Batch ntixers require reliable dosing measurement, which can be accomplished by weighing the components individually. 

A typical batch mixer test would include the following steps  

Load the components in predetermined sequence. The sequence of addition of components can affect the rate at which homogeneity is achieved. 

Stop the mixer and take 10 to 15 samples from various locations within the mixer. Refer to the sampling guidelines discussed earlier. 

Start the mixer again and repeat steps 2 and 3 at least three more times. The subsequent mixing times can be chosen in a geometric progression (e.g., 2, 4, 8, and 16 min). 

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