Some factors affecting sieving performance and efficien1cy.pdf

Powder Technology 193 (2009) 208–213
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Powder Technology
journal homepage: ate/powtec
Some factors affecting sieving performance and efficiency
KeShun Liu ⁎
Grain Chemistry and Utilization Laboratory, National Small Grains and Potato Germplasm Research Unit, USDA-ARS, 1691 S. 2700 West, Aberdeen, ID 83210, USA
article info abstract
Article history: Sieving or screening has been the oldest yet most important unit operation for industrial separation of solid
Received 6 August 2008 particles or as a laboratory method in size analysis. A stack of sieves with decreasing mesh size is usually
Received in revised form 9 March 2009 used. Alternatively, particles can be sifted in a fine to coarse order by multiple sieving steps with each step
Accepted 17 March 2009
using a single sieve. The latter is referred to as reverse sieve method. This pared the two methods
Available online 25 March 2009
for sieving performance and efficiency using flours made from soft white and hard white wheat, hulless
barley and medium grain rice. Additional factors, including milling method (impact vs. abrasive), flour
Keywords:
Size separation moisture (7% vs. 11%), duration of sieving (60 vs. 120 min), and tapping (percussion during sieving), were
Flour also investigated. Mass frequency and protein content of oversize fractions were measured. Results