World Grain - February 2021 - 56

MILLING OPERATIONS

Millers may be the practical specialists
that can take into account the
nature of the plant matrix to assist
with efficient conventional and
non-conventional selective extraction.

WG_Feb21.indb 56

and production is largely left in the
field while, in the case of rice, oats
and barley, the chaff or hull remains
attached and is therefore removed by
impact as in oat milling or more aggressive abrasion as in barley milling. The bran of wheat comes off in
larger sections as it moves through
the break system while that of rice has
to be abraded off the brown rice to remove the bran. In the case of corn and
sorghum milling, the refined product
must have the hull removed and the
germ separated to prevent rancidity.
Oats must be hulled and the groat
steam treated to stabilize the oat product before it can be cut, steamed, and
flaked to make an oat flake. All these
milling systems address properties of
the material to be processed and finished product specifications to determine equipment selection and setting.
These milling technology processes may be used not only for cereal grains, pseudocereals, pulses and
seeds but other biological products as
well. In addition, such processes may
be positioned ahead of chemical and
physical separation technologies such
as solvent extraction, expellers, and
other types of fluid extraction techniques.
In reviewing a YouTube video showing cannabidiol (CBD) oil production,
which is an extract of the  cannabis
plant and utilizing hemp  flowers and
leaves for its production. The video
showed after a brief grind in a largescale food processor a wide range of
particle sizes and, in particular, buds
or flowers, which may have a higher
oil content than leaves or stems. To access raw material, dried product could
be separated into stems, leaves and
buds to determine if the anatomical
parts had different oil contents. As the
ground hemp undergoes solvent extraction, coarse product may retain residual oil depending on thickness and
retention time in the extraction chamber. Production rate (time in extractor)
may be reduced with smaller, more
uniform product increasing batches

2/12/2021 8:30:59 AM


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World Grain - February 2021

Table of Contents for the Digital Edition of World Grain - February 2021

World Grain - February 2021 - 1
World Grain - February 2021 - 1
World Grain - February 2021 - 2
World Grain - February 2021 - 3
World Grain - February 2021 - 4
World Grain - February 2021 - 5
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https://www.nxtbook.com/sosland/wg/2011_05_01
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http://digital.world-grain.com/sosland/wg/2010_06_01
http://digital.world-grain.com/sosland/wg/2010_05_01
http://digital.world-grain.com/sosland/wg/2010_04_01
http://digital.world-grain.com/sosland/wg/2010_03_01
http://digital.world-grain.com/sosland/wg/2010_02_01
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http://digital.world-grain.com/sosland/wg/2009_09_01
http://digital.world-grain.com/sosland/wg/2009_08_01
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http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
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