World Grain - December 2006 - 41
feedoperations
Pellet quality
Conditioning before pelleting and the
cooling process afterward have a major
impact on the end feed product
by Jonathan Bradshaw
In this final article of the pelleting
series, the issues of conditioning before
pelleting and the art of cooling afterwards will be examined.
Original pelleting machines included very little, if any, meal conditioning prior to passing meal into the die
chamber. Occasionally some moisture
was added, but little else was done. In
the search for improved performance,
it was noted that when higher levels of
moisture were added, it was driven off
as it passed through the die in the form
of water vapor, and simultaneously the
amount of power consumed decreased.
Hence, the use of steam as a lubricating
agent began.
Today, steam is used in almost every
pelleting application.
CONDITIONERS
Several different types of conditioners are used today. The most common
is the barrel type, often referred to as a
turbulator conditioner. The barrel-type
conditioners have gradually become
bigger, longer and with two or even
three beater shafts passing through
them.
But the most widely adopted is the
Editor's note: This is the third article in a three-part series on pelleting. The first article appeared in the
October issue of World Grain and the
second article appeared in the November issue.
42
December 2006 / World Grain / www.World-Grain.com
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World Grain - December 2006
Table of Contents for the Digital Edition of World Grain - December 2006
Contents
World Grain - December 2006 - 1
World Grain - December 2006 - 2
World Grain - December 2006 - 3
World Grain - December 2006 - Contents
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