TOPIC: Modes of SIZE Reduction & Fluid Enery Mill
PHARMACEUTICAL ENGINEERING
PREPARED BY KASHISH WILSON
ASSISTANT PROFESSOR,
MM COLLEGE OF PHARMACY,
MM(DU),MULLANAAMBALA

Modes of size reduction:
Cutting: Description:The material is cut by means of a sharp blades.Type of
material: used for fibrous and waxy material
Eg : cutter mill
Compression:
 In this mode material is crushed between roller by the application of
pressure, used for soft materials Eg : roller mill
Impact:
 This involve the operation of hammer/bars at high speeds.
 When a lump of material strikes the rotating hammers, the material splits
apart. Used for all drugs Eg : fluid energy mill
Attrition: breaking down by the rubbing action between two surfaces. Used for
brittle drugs Eg : fluid energy mill, ball mill

Thank you