World Grain - June 2012 - 54

MILLINGOPERATIONS

Keeping sifters in good working order
Production of flour depends on the proper selection and maintenance of the right sifter and sieving material
by Mark Fowler

Sifters may be the most misunderstood and underappreciated machine in the milling system. Roller mills are considered by many to be the workhorse and the heart of any milling system. However, the production of ﬂour, or nearly any ground product, depends on the proper selection and maintenance of the right sifter and sieving material. Sifters come in many shapes and sizes. Multiple-section, gyratory sifters swinging from the ceiling are the most common sifter in most modern ﬂour mills. While one product goes into a sifter, two or more products come out. A sifter can be used as part of the quality assurance program or as an integral part of the production process. It can be used to remove coarse material, separate ﬁnes or grade material into multiple streams. To keep a sifter working as it was designed requires maintenance both inside and out. Typical applications for sifters include scalping, grading and the removal of ﬁne material. Scapling, or the removal of course, over-sized material, is the sifter’s most common quality assurance application. The scalped material can be lumps in materials such as ﬂour mixes as well as foreign materials such as insects, scale from a bin wall or transport lines and ﬂakes, moldy material or tramp metal. When removing ﬁnes, the sifter removes undersized material to assure a granular product meets ﬁnal speciﬁcations. This is useful for friable materials that produce ﬁnes during transport. Grading is the most common application of a sifter in the milling process. The sifter separates and distributes material in multiple granulations for further processing. KEEPING SIFTERS IN GOOD REPAIR Because a sifter rotates or gyrates at high speed, it needs regular maintenance to keep it operating and performing the job it is designed to do. Regular inspection and service of the sifter drive and reeds is necessary to address changes due to wear and environment.
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Sieves in the sifters are made from preformed plastic rather than wood, meaning there is no wood in the flour mill, which helps to improve sanitation.

It is inevitable that the sifter drive mechanism will wear out, requiring replacement or repair of critical parts. Material backing up from the top of one or more sifter sections can indicate the sifter is running slower than required as a result of slipping drive belts or a bearing beginning to freeze up. The reeds used to suspend the sifter from the ceiling or support beams required regular checks as well. As the mill
June 2012 / World Grain / www.World-Grain.com

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World Grain - June 2012

Table of Contents for the Digital Edition of World Grain - June 2012

World Grain - June 2012
Table of Contents
From the Editor-in-chief - Global food parallels oil refining
Calendar of Events
News Review - Marubeni to acquire Gavilon for $3.6 billion
News Review - CHS buys portion of Brazilian grain export terminal
News Review - Tiger Brands eyes stake in Nigerian mill
News Review - E.U. 2012 wheat output projected at five-year low
News Review - GrainCorp to invest in its logistics systems
News Review - U.S. rice mills shipments up 8% over 2009-10
News Review - Indofood profits up nearly 11% in first-quarter
News Review - MGPI reports increase in first-quarter income
News Review - GrainCorp earnings up 39% on grain results
News Review - Baltic Trading’s net loss increases in first-quarter
News Review - The Andersons reaches first-quarter record on grain results
News Review - Noble’s ag income drops 63% in first-quarter
News Review - Olam profits down 19% in third quarter
News Review - FEFAC, Laurent Bellec partner on feed mill photo project
News Review - Gevo, Land O’Lakes to pursue advanced animal feed
News Review - CHS, Zen-Noh form grain marketing joint venture
News Review - Horizon Milling planning major modernization of Texas mill
Grain Market Review - Wheat
Country Focus - Focus on the United Kingdom
Feature - Rising up from the rubble
Feature - Gone in a matter of seconds
Feature - 2012 IAOM Conference & Expo
Feature - IAOM plans trio of conferences
Milling Operations - Keeping sifters in good working order
Feature - European supplier profiles
Supplier News
Advertiser Index/Faxback Program
World Grain - June 2012 - World Grain - June 2012
World Grain - June 2012 - 2
World Grain - June 2012 - 3
World Grain - June 2012 - 4
World Grain - June 2012 - Table of Contents
World Grain - June 2012 - From the Editor-in-chief - Global food parallels oil refining
World Grain - June 2012 - 7
World Grain - June 2012 - Calendar of Events
World Grain - June 2012 - 9
World Grain - June 2012 - News Review - Tiger Brands eyes stake in Nigerian mill
World Grain - June 2012 - 11
World Grain - June 2012 - News Review - E.U. 2012 wheat output projected at five-year low
World Grain - June 2012 - News Review - U.S. rice mills shipments up 8% over 2009-10
World Grain - June 2012 - News Review - MGPI reports increase in first-quarter income
World Grain - June 2012 - News Review - Baltic Trading’s net loss increases in first-quarter
World Grain - June 2012 - News Review - Noble’s ag income drops 63% in first-quarter
World Grain - June 2012 - News Review - FEFAC, Laurent Bellec partner on feed mill photo project
World Grain - June 2012 - News Review - CHS, Zen-Noh form grain marketing joint venture
World Grain - June 2012 - News Review - Horizon Milling planning major modernization of Texas mill
World Grain - June 2012 - Grain Market Review - Wheat
World Grain - June 2012 - 21
World Grain - June 2012 - Country Focus - Focus on the United Kingdom
World Grain - June 2012 - 23
World Grain - June 2012 - 24
World Grain - June 2012 - 25
World Grain - June 2012 - 26
World Grain - June 2012 - 27
World Grain - June 2012 - Feature - Rising up from the rubble
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World Grain - June 2012 - Feature - Gone in a matter of seconds
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World Grain - June 2012 - Feature - 2012 IAOM Conference & Expo
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World Grain - June 2012 - Feature - IAOM plans trio of conferences
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World Grain - June 2012 - Milling Operations - Keeping sifters in good working order
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World Grain - June 2012 - Feature - European supplier profiles
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World Grain - June 2012 - Supplier News
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World Grain - June 2012 - 101
World Grain - June 2012 - Advertiser Index/Faxback Program
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http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_01
http://digital.world-grain.com/sosland/wg/2004_09_01
http://digital.world-grain.com/sosland/wg/2004_08_01
https://www.nxtbookmedia.com