1
Q
Mode of reduction
A
Cutting
Compression (crushed)
Shear
Impact (strikes against hammer)
Attrition (rubbing action)
2
Q
Types of force in mode of reduction
A
Compressive: used for coarse crushing of hard materials
Impact: used to mill a wide variety of materials
Shear: applied for soft materials
3
Q
Characteristics of roller mills
A
For wheat milling
Compressive force
4
Q
Types of roller mills
A
Two roller mills
Four roller mills
Five and six roller mills
5
Q
Types of equipment with each force
A
compressive force: grinder mill, ball mill, crushers
impact force: hammer mill, cutter mill
shear force: disc mill, shredder, chopper
6
Q
Factors that influence the energy input
A
Moisture content of the food
Heat sensitivity of the food
