Roller Mill

Advantages:

• energy efficient
• uniform particle-size distribution
• little noise and dust generation

Disadvantages:

• little or no effect on fiber
• particles tend to be irregular in shape and dimension
• may have high initial cost (depends on system design)
• when required, maintenance can be expensive

General Design

There are many manufacturers of roller mills, but they all share the following design features shown adjacent picture:

• a delivery device to supply a constant and uniform amount of the material to be ground
• a pair of rolls mounted horizontally in a rigid frame
• one roll is fixed in position and the other can be moved closer to or further from the fixed roll
• the rolls counter rotate either at the same speed or one may rotate faster; roll surface may be smooth or have various grooves or corrugations
• bar; pairs of rolls may be placed on top of one another in a frame.