Feed Strategy - October 2019 - 33

FeedStrategy ❙ 33

Equipment, different processing options and
parameter settings define the granulation of the
feed mash. Courtesy Bühler Group
With increasing hammer length and thereby a
decreasing distance between the hammer and the
screen (figure 2, b and c), the angle of impact of the
particles on the screen becomes flatter. The particles
bounce off the screen and remain longer in the
grinding chamber where they are ground further.

Screens
Granulation can be influenced by the size of the
screen hole and the open screen area. The size of
the screen hole defines the size of the particle that
can pass through the screen: granulation becomes
coarser as the size of the screen hole increases. The
same effect can be observed as the size of the open
screen area increases.

Finer grinding doesn't help efficiency for all
feeds: https://bit.ly/2kQuadx
and raw material parameters.
The following discussion focuses
on the machine and the process-related parameters.

Hammers
In a hammer mill, the hammers constitute the essential
grinding element. Particles break when the rapidly
moving hammers hit the slowly moving particles.
The most obvious influence factor is the number of
hammers: the probability that the particles will be hit
increases with an increased number of hammers, thus
resulting in finer final granulation.
Another parameter is the length of the hammers
as this determines the angle at which the particles are
deflected from the hammers. This deflection angle
can be modified by varying the hammer length. Short
hammers with a longer distance to the screen (figure 2,
a) deflect the particles vertically to the screen.
The particles can pass through the screen directly
as soon as they are small enough to do so.
October 2019 ❙ www.FeedStrategy.com

With a larger open screen area, the particles can
leave earlier because the probability of hitting a bar
between the holes is much smaller. The retention time
of the particles inside the grinding chamber further
depends on the level of wear of the screens. Worn-out
screens have rounded edges, which deflect more
particles back inside the grinding chamber. Therefore,
worn-out screens lead to finer granulation and wider
particle size distribution.

Impact plates and deceleration chamber
The principle of the hammer mill is to create a
high velocity difference between hammers and
particles. Impact plates and deceleration chambers can help to increase velocity differences by
slowing down the particles and leading them back
to the rotor. Thereby, the particles are hit more
often by the hammers.


https://www.bit.ly/2kQuadx http://www.FeedStrategy.com

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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