Size Reduction Methods
1. Cutting methods
•Size reduction range 100-100000
•Principle of operation: A cutter mill consists of a series of knives attached to a horizontal rotor which act against a series of stationary knives attached to the mill casing.
Cutter mill
2. Compression Methods
Size reduction range •
750-100000(Roller mill) •Size reduction range. (40-100000(End runner mill)
•Principle of operation: size reduction by compression can be carried out on a small scale using a mortar & pestle
a. Roller mill
b. End runner mill
3. Impact Methods. Size reduction range 8-7500
•Principle of operation: size reduction by impact is carried
out using a hammer mill.
Hammer mill
4- Attrition methods
Roller mill
Roller mills use the principle of attrition to produce
size reduction of solids in suspensions, pastes or
ointments.
5- Combined impact and attrition methods
A. Ball mill
A ball mill is an example of a comminution method. which produces size reduction by both impact and attrition of particles. Ball mills consist of a hollow
cylinder mounted such that it can be rotated on
its horizontal longitudinal axis
B .Fluid energy mill
Fluid energy milling is another form of size reduction method that acts by particle impaction and attrition.
C. Pin mill
In addition to ball mills and fluid energy mills, there
are other methods of comminution that act by producing
particle impact and attrition.
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