Feed Strategy - October 2019 - 35

FeedStrategy ❙ 35

PARTICLE SIZE MODIFICATION

Particle size distribution in hammer and roller mills

Overs (%)

Hammer mill
50
45
40
35
30
25
20
15
10
5
0
100

Courtesy Bühler Group

Tip speed
By adjusting the tip speed with a
frequency converter, particle size
distribution can be varied without
any mechanical intervention. With
increasing rotor and hammer speed,
the granulation becomes finer and
the particle size distribution becomes
wider. Therefore, the grinding process
becomes more flexible with a frequency
converter, and granulation can be
adjusted within a short space of time.

Roller mill

Hammer mill

Roller mill
0
10
20
30
40
50
60
70
80
90
100

Overs (%)

The deceleration chamber also
causes turbulent conditions and
interrupts the circular movement of
the product with the rotor and the
hammers. This prevents the production of fines due to shearing along
the screens. The particles remain
inside the grinding chamber for
almost the same time, resulting in
finer granulation as well as narrower
particle size distribution.

1000
Particle size (μm)

Figure 1: Cumulative (continuous line) and density (dotted lines)
particle size distributions of corn ground with a hammer mill (purple)
and roller mill (green) in comparison. The d50 value is marked with
a red line. Both samples have the same d50 value but a different
particle size distribution.

Aspiration
The aspiration of a hammer mill
can significantly influence capacity
and particle size distribution. With
increasing aspiration air flow, the

particles get sucked through the
screens. Thus, the particles leave
the grinding chamber earlier,
resulting in less fine particles and
narrower particle size distribution.

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October 2019 ❙ www.FeedStrategy.com


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Feed Strategy - October 2019

Table of Contents for the Digital Edition of Feed Strategy - October 2019

Feed Strategy - October 2019
Contents
In the Mix
Industry Happenings
Consumers, weather, trade sway 2019 dairy feed volumes
Tips for maximizing forage in ruminant rations
How to replace corn with wheat in modern animal diets
Marketing nutrition by following trends
What AGPs can teach us about growth promotion
Broad review of research presented during 2019 ESPN
Grinding: benefits of particle size modifications
Products
Advertisers’ Index
Feed Strategy - October 2019 - CT1
Feed Strategy - October 2019 - CT2
Feed Strategy - October 2019 - Feed Strategy - October 2019
Feed Strategy - October 2019 - Cover2
Feed Strategy - October 2019 - CT3
Feed Strategy - October 2019 - CT4
Feed Strategy - October 2019 - Contents
Feed Strategy - October 2019 - In the Mix
Feed Strategy - October 2019 - Industry Happenings
Feed Strategy - October 2019 - Consumers, weather, trade sway 2019 dairy feed volumes
Feed Strategy - October 2019 - 5
Feed Strategy - October 2019 - 6
Feed Strategy - October 2019 - 7
Feed Strategy - October 2019 - 8
Feed Strategy - October 2019 - 9
Feed Strategy - October 2019 - Tips for maximizing forage in ruminant rations
Feed Strategy - October 2019 - 11
Feed Strategy - October 2019 - 12
Feed Strategy - October 2019 - 13
Feed Strategy - October 2019 - 14
Feed Strategy - October 2019 - 15
Feed Strategy - October 2019 - How to replace corn with wheat in modern animal diets
Feed Strategy - October 2019 - 17
Feed Strategy - October 2019 - 18
Feed Strategy - October 2019 - 19
Feed Strategy - October 2019 - 20
Feed Strategy - October 2019 - 21
Feed Strategy - October 2019 - Marketing nutrition by following trends
Feed Strategy - October 2019 - 23
Feed Strategy - October 2019 - What AGPs can teach us about growth promotion
Feed Strategy - October 2019 - 25
Feed Strategy - October 2019 - 26
Feed Strategy - October 2019 - 27
Feed Strategy - October 2019 - Broad review of research presented during 2019 ESPN
Feed Strategy - October 2019 - 29
Feed Strategy - October 2019 - 30
Feed Strategy - October 2019 - 31
Feed Strategy - October 2019 - Grinding: benefits of particle size modifications
Feed Strategy - October 2019 - 33
Feed Strategy - October 2019 - 34
Feed Strategy - October 2019 - 35
Feed Strategy - October 2019 - 36
Feed Strategy - October 2019 - 37
Feed Strategy - October 2019 - Products
Feed Strategy - October 2019 - 39
Feed Strategy - October 2019 - Advertisers’ Index
Feed Strategy - October 2019 - Cover3
Feed Strategy - October 2019 - Cover4
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