Section 13 - Mill Balance

Question 1

When is a mill balanced

Answer 1

When all parameters determined at the design, planning and installation stages are maintained

Question 2

What must be kept in mind for good mill balance

Answer 2

Correct moisture and condition of feed to mill
Break and scratch rolls in good operation condition
Scalping and grading equipment in sound order
Correct operational settings on purifiers
Correct grind and even distribution of feed over length of reduction rolls
Dressing sifter covers should be checked regularly to ensure theyre in good working condition
Dust collector sleeves must be kept clean for efficient dust extraction

Question 3

Why must adjustments be made when changing from a hard wheat to a soft wheat grist?

Answer 3

Bring flour to spec in shortest time
Minimise amount of re-mill product
Optimise mill efficiency

Question 4

What is changed when changing grists

Answer 4

Wheat moisture, Feed rate, Break roll releases, purification, reduction rolls, in-line disrupters

Question 4

What happens to feedrate when going from hard to soft wheat

Answer 4

Reduced 5-10%

Question 4

What changes in wheat moisture going from hard to soft wheat

Answer 4

Moisture reduced by 1%, shorter conditioning time (6-12 hrs rather than 12-24hrs), reduction in grind pressure

Question 5

What happens to breakroll releases when going from hard to soft wheats

Answer 5

Controlled more carefully. Break releases are higher on 1bk and 2bk when milling soft wheat

Question 6

What happens with purification when changing from hard to soft wheats

Answer 6

There is less coarse/medium flour and more fine semolina/middlings/break flour, so less feed on the coarse/medium purifiers and more on the fine semolina/middling purifiers

Question 7

What happens with the reduction rolls when grinding a softer flour

Answer 7

Grinding pressure is eased (soft does not need as much starch damage)