Feed Strategy - October 2019 - 36

36 ❙ FeedStrategy
PARTICLE SIZE MODIFICATION
Aspiration and tip speed are
factors that can be adjusted
without any idle time.

Inner workings of a hammer mill
a)

b)

c)

Influencing factors
on roller mills
In contrast to the hammer mill,
the roller mill is limited in terms
of the variety of products that it
can process. Fibrous products and
coarse products are difficult to grind
with this equipment. Furthermore,
the process is much less flexible.
Particle size can only be influenced
by the number and type of corrugations on the rolls and the roll gap.
The number and type of corrugations is preset by the selected rolls

Courtesy Bühler Group

and cannot be changed easily.
By adjusting the roll gap, the
granulation of the product can be
modified whereas the distribution

Figure 2: Deflection of particles
on the hammers and on the
screen. a) Short hammers
deflect particles at a steep
angle enabling them to directly
pass through the screens (b
and c). The longer the hammer,
the flatter the angle of impact
preventing the particles from
leaving the grinding chamber.
curves remain the same. Therefore,
the number of fines and coarse
particles at a constant d50 value
cannot be modified.

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Influence of step grinding on
particle size distribution
Step grinding is the combination of
sifting and grinding. The product is
sifted before grinding and only the
overs - the coarse particles - are
ground. Different grinders such as
hammer mills and roller mills can
be combined in this kind of process.
After each grinding step, the
product is sifted again and only the
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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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