size reduction mills

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Presentation Description

gives an overview on mills used for size reduction of material

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Presentation Transcript

Slide 1: 

9/15/2010 1 SIZE REDUCTION MILLS : AN OVERVIEW By SUDHA.TM.Pharm

Slide 2: 

Cutting - Sharp blades Compression - crushed between rollers Impact - material strikes against rotating hammers Attrition - rubbing action between two surfaces MODES OF STRESS

BASIC COMPONENTS OF A MILL : 

BASIC COMPONENTS OF A MILL HOPPER MILLING CHAMBER RECEIVER

SIZE REDUCTION EQUIPMENT : 

SIZE REDUCTION EQUIPMENT EDGE RUNNER/ ROLLER MILL END RUNNER MILL/ MECHANICAL MOTOR & PESTEL CUTTER MILL/ ROTARY CUTTER ROLLER MILL HAMMER MILL/ IMPACT MILL BALL MILL/ TUMBLING MILL & TUBE MILL FLUID ENERGY MILL/ JET MILL SQUIRREL CAGE DISINTEGRATOR COLLOIDAL MILL/ OINTMENT MILL

Slide 5: 

EDGE RUNNER MILL Principle: Shearing between roller and base; Crushing below the rollers

Slide 6: 

Principle: Shearing between roller and base; Crushing below the rollers END RUNNER MILL

Slide 7: 

CUTTER MILL Size reduction takes place with the aid of sharp blades Principle – Cutting

ROLLER MILL : 

ROLLER MILL Size reduction takes place due to the compression of material in between the rollers Principle: Compression Grinding Elements: Rollers Modifications : Rollers with sharp edges

Slide 9: 

HAMMER MILL Principle: Break the material with hammers Grinding Media: Hammers Types of hammers: 1. Swinging 2. Fixed

Slide 10: 

HAMMER MILL MODIFICATIONS : Hammer Crusher & Mikro Pulverizer

Slide 11: 

BALL MILL Principle: Tumbling & Attrition between balls. 3 modes of movement of balls Critical speed High speed Modification: Hardinge Mill, Continuous Ball Mill

Slide 12: 

TUBE MILL BALL MILL The length of the mill chamber is greater than its diameter. Different size balls are used at a time Rotates at a relatively lower speed Relatively finer product The length of the mill chamber is almost equal to its diameter Same size balls are used Rotates at a relatively faster speed Relatively coarser product is obtained

FLUID ENERGY MILL : 

FLUID ENERGY MILL Principle: Size reduction takes place due to collision between particles

Slide 14: 

SQUIRREL CAGE DISINTEGRATOR Principle: Impact & Attrition between rods Grinding Elements: Rods fixed to the discs.

Slide 15: 

Principle: Shearing between rotor and stator. Mainly used for liquids COLLOIDAL MILL

Slide 16: 

Cutter mill - Cutting - Fibrous & tough material - Plant parts Roller mill -Crushing/ - Crushing of seeds & soft tissues compression b’n rollers Hammer mill -Impact b’n - Brittle; Non abrasive – mod. hammer & material abrasive & fibrous Ball mill -Attrition - hard & abrasive materials Air jet mill -Impact & Attrition -Mod. Hard materials; Antibiotics & Vitamins Colloidal mill -Shearing between - formation of emulsions; breaking rotor & stator of agglomerates in liquids Disintegrator - Impact & Attrition - Brittle materials MILL PRINCIPLE TYPE OF MATERIAL

Slide 17: 

Sterile preparations Volatile materials Hygroscopic materials Easily oxidizable materials BALL MILL IMPACT MILLS Cohesive materials -

Slide 18: 

http://www.plas-video.com/REP/hammer-mill.htm http://www.metacafe.com/watch/1152623/crushers_mills/ http://rpaulsingh.com/animated%20figures/fig12_8.htm VIDEO LINKS FOR MILLING

Slide 19: 

THANK YOU

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