Size reduction 3

Equipments of size reduction :

2-Hammer Mill

It is an impact mill using a high speed rotors to which are fixed a number of hammers.

The material is fed at the top or center, thrown out centrifugally, and ground by impact of hammers or against the plates around the periphery.

The hammer mill, which can be either the horizontal or vertical shaft type, is one of the most widely used mills in the pharmaceutical industry.

3-Cutting Mill

•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.

The most commonly used mills in pharmaceutical are the Rotary cutter, Hammer Roller and Fluid energy mill

4-Single-Drive Roller Mill

•.The roller mill has two cylindrical rolls of stone or metals mounted horizontally which are capable of rotation on their longitudinal axes.

•One of the rolls is driven directly while the second is rotated by friction when material is drawn through the gap between the rolls.

•Comminution occurs by compression Used for cracking seeds prior to extraction of fixed oils.