Determining external friction angle of barley malt and malt crush
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Kuupäev
2019
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This paper deals with determining the amount of external friction angle of barley malt
and malt crush depending on the load size. Barley malt is a basic raw material for production of
the traditional Czech Pilsner type of beer. The angle of internal and external friction is one of the
basic parameters of bulk materials. Friction among individual grains of material, i.e. a connection
with the forces, applied between individual material particles, includes the internal friction angle.
Conversely, the external friction angle is the angle in which the bulk material begins to move on
the other material (steel). A two-roll mill (or disc mill and hammer mill) was used for the malt
crush manufacture, which is used in the traditional malt processing in beer production. During
crushing on this machine, we used the passage of the milled material through a gap between two
counter-rotating cylinders. The results of barley malt and malt crush external friction angle,
depending on the load size of the barley malt and the malt crush on mobile prototype device, are
from 8 to 22°. The mobile prototype device is based on the following principle: a square chamber
filled with a loaded material moves on the pad (steel).
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barley malt, external friction angle, food industry, particulate matter, articles