World Grain - May 2019 - 48

MILLING OPERATIONS

Maintaining mill balance
A cumulative ash curve can help gauge mill performance
by Jeff Gwirtz
In my previous article in the February 2019 issue of World
Grain, the procedure to develop utilizing step charts was presented as part of a series of articles to discuss in greater detail
the development and utilization of the three tools mentioned
in Mark Fowler's article, "Balancing the mill," in the February 2012 issue of World Grain.
As previously indicated, the analysis of all mill streams
LGHQWL¿HGLQDFRPPHUFLDOPLOOVWHSFKDUWLVVHOGRPFRQGXFWHG
due to time and resource constraints. More often, a weigh off
DQGDQDO\VLVRIRQO\WKHÀRXUVWUHDPVLVFRQGXFWHGWRGHYHORS
a cumulative ash curve. This article is intended to provide a
brief introduction to cumulative ash curve development.
-RKQ:LQJ¿HOGLQWKH³'LFWLRQDU\RI0LOOLQJ7HUPV´SXElished by the International Association of Operative Millers
LQGH¿QHVDFXPXODWLYHDVKFXUYHDV³DJUDSKVKRZLQJ KRZ ÀRXU DVK LQFUHDVHV ZKHQ VWDUWLQJ IURP WKH ORZHVW
DVK LQGLYLGXDO ÀRXU LQ D PLOO DQG SURJUHVVLYHO\ DGGLQJ WKH
UHVWRIWKHLQGLYLGXDOÀRXUVWRSUHYLRXVPL[LQRUGHURIWKHLU
ascending ash contents." It is a tool for evaluating mill performance and varietal and crop year differences of wheat
that effect milling.
'DWDFROOHFWLRQIRUWKHFXPXODWLYHDVKFXUYHPXVWEHFRQducted to ensure an accurate weight is recorded and calculations made to a common time basis such as kilograms or
metric tons per minute or hour. Samples collected for ash and
RWKHU DQDO\VLV PXVW EH FROOHFWHG ZLWK FDUH WR UHÀHFW FXUUHQW
production rather than old stock remaining in the weigh off
spout or contamination with other materials in the mill.
Following data collection as described in a previous article
in this series is advised.
CHECKING THE DATA
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for errors in measurement and balance from both a quantitative and qualitative perspective. Table I (page 50) pro48

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As a guideline difference in either the quantity or quality
PHDVXUHPHQWRIWRVKRXOGEHH[DPLQHG,QWKHFDVH
of B1B2 stock sieved on three sections of sifter A, B and C,
the difference in ash content from section B is suspect and
should be re-tested or re-sampled. Perhaps it is different due
to screen wear, screen selection or a hole in the screen. The
GLIIHUHQFHPXVWEHIXUWKHUH[SORUHG
/LNHZLVHWKHDVKFRQWHQWRI&ÀRXUSURGXFHGRQWZRGLIferent sections at the same rate appear quite different and must
EH H[DPLQHG & ÀRXU LV UHDVRQDEO\ FORVH LQ WHUPV RI ERWK
production rate and ash content, suggesting balance in load,
grinding and sifting.
5) ÀRXU SURGXFWLRQ UDWH LV TXLWH D ELW GLIIHUHQW EHWZHHQ
the two sections employed, indicating a difference in loading,
JULQGLQJRUVLIWLQJWKDWPXVWEHH[SORUHG%OLNH&GHPRQVWUDWHVVLPLODUSHUIRUPDQFHOHYHOLQWHUPVRIÀRXUSURGXFWLRQ
and grinding for multiple sifter sections.
5 ÀRXU SURGXFWLRQ UDWH DQG TXDOLW\ DUH VLJQL¿FDQWO\ GLIIHUHQWDQGPXVWEHH[DPLQHGFORVHO\,QWKHVHH[DPSOHVRQH
might look at the load and granulation of incoming stock to
the sifter sections. Both the quantity and granulation should
EH VLPLODU RWKHUZLVH IXUWKHU H[DPLQDWLRQ LQWR JULQGLQJ DQG
roll input is warranted. If the quantity and quality of the stock
WR HDFK VHFWLRQ LV VLPLODU WKH VLHYH VHFWLRQV PXVW EH H[DPLQHG WR FRQ¿UP SURSHU ÀRZ FORWK VHOHFWLRQ FORWK ZHDU DQG
cleaner performance.
([FHVVLYHYDULDWLRQLQÀRXUSURGXFWLRQUDWHDQGDVKVKRXOG
be taken as sign of imbalance and corrected immediately.
CALCULATIONS
0RLVWXUHFRQWHQWRIWKHÀRXUSURGXFHGLVXVHGWRDGMXVWDVK
content to a common moisture basis. In North America, it is
FRPPRQWRDGMXVWDVKWRDPRLVWXUHEDVLVZKLOHLQWHUQDtionally a 0% moisture basis is commonly used.
May 2019 / World Grain / www.World-Grain.com


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World Grain - May 2019

Table of Contents for the Digital Edition of World Grain - May 2019

World Grain - May 2019
Contents
FROM THE EDITOR - Grain industry a casualty of trade wars
CALENDAR OF EVENTS
GrainTech India 2019 focuses on critical issues facing region's agriculture industry
MORTON IRVIN SOSLAND
News review - Significant expansion planned for P&H flour mill
Ardent Mills to build mill at Port Tampa Bay
Olam to acquire Dangote Flour Mills
WTO finds China breaches grain TRQ commitment
ADM opens newest feed facility
Minimex to expand maize milling capacity
GRAIN MARKET REVIEW - COARSE GRAINS
COUNTRY FOCUS - GERMANY
FEATURE: A TWISTED WORK OF ART
Pretzels: A medieval food during Lent
FEATURE: GEOPOLITICS DOMINATE BLACK SEA GRAIN CONFERENCE
FEED QUARTERLY - UKRAINE EYES FEED EXPORT INCREASE
Meat consumption rising in SOUTH AFRICA
Sizing batching scale hoppers and mixers
MILLING OPERATIONS - Maintaining mill balance
FEATURE: WEATHER PROBLEMS HAVING LITTLE IMPACT ON MARKET
TECHNICAL PROFILE - THE DIVERSE legume
EUROPEAN SUPPLIER PROFILES
SUPPLIER NEWS
WORLD GRAIN ARCHIVE
ADVERTISER INDEX
World Grain - May 2019 - World Grain - May 2019
World Grain - May 2019 - World Grain - May 2019
World Grain - May 2019 - 2
World Grain - May 2019 - 3
World Grain - May 2019 - 4
World Grain - May 2019 - Contents
World Grain - May 2019 - FROM THE EDITOR - Grain industry a casualty of trade wars
World Grain - May 2019 - 7
World Grain - May 2019 - GrainTech India 2019 focuses on critical issues facing region's agriculture industry
World Grain - May 2019 - 9
World Grain - May 2019 - MORTON IRVIN SOSLAND
World Grain - May 2019 - 11
World Grain - May 2019 - Ardent Mills to build mill at Port Tampa Bay
World Grain - May 2019 - Olam to acquire Dangote Flour Mills
World Grain - May 2019 - WTO finds China breaches grain TRQ commitment
World Grain - May 2019 - Minimex to expand maize milling capacity
World Grain - May 2019 - GRAIN MARKET REVIEW - COARSE GRAINS
World Grain - May 2019 - 17
World Grain - May 2019 - COUNTRY FOCUS - GERMANY
World Grain - May 2019 - 19
World Grain - May 2019 - 20
World Grain - May 2019 - 21
World Grain - May 2019 - FEATURE: A TWISTED WORK OF ART
World Grain - May 2019 - 23
World Grain - May 2019 - 24
World Grain - May 2019 - 25
World Grain - May 2019 - Pretzels: A medieval food during Lent
World Grain - May 2019 - 27
World Grain - May 2019 - 28
World Grain - May 2019 - 29
World Grain - May 2019 - FEATURE: GEOPOLITICS DOMINATE BLACK SEA GRAIN CONFERENCE
World Grain - May 2019 - 31
World Grain - May 2019 - 32
World Grain - May 2019 - 33
World Grain - May 2019 - 34
World Grain - May 2019 - 35
World Grain - May 2019 - FEED QUARTERLY - UKRAINE EYES FEED EXPORT INCREASE
World Grain - May 2019 - 37
World Grain - May 2019 - 38
World Grain - May 2019 - 39
World Grain - May 2019 - Meat consumption rising in SOUTH AFRICA
World Grain - May 2019 - 41
World Grain - May 2019 - 42
World Grain - May 2019 - 43
World Grain - May 2019 - Sizing batching scale hoppers and mixers
World Grain - May 2019 - 45
World Grain - May 2019 - 46
World Grain - May 2019 - 47
World Grain - May 2019 - MILLING OPERATIONS - Maintaining mill balance
World Grain - May 2019 - 49
World Grain - May 2019 - 50
World Grain - May 2019 - 51
World Grain - May 2019 - 52
World Grain - May 2019 - 53
World Grain - May 2019 - FEATURE: WEATHER PROBLEMS HAVING LITTLE IMPACT ON MARKET
World Grain - May 2019 - 55
World Grain - May 2019 - 56
World Grain - May 2019 - 57
World Grain - May 2019 - TECHNICAL PROFILE - THE DIVERSE legume
World Grain - May 2019 - 59
World Grain - May 2019 - EUROPEAN SUPPLIER PROFILES
World Grain - May 2019 - 61
World Grain - May 2019 - 62
World Grain - May 2019 - 63
World Grain - May 2019 - 64
World Grain - May 2019 - 65
World Grain - May 2019 - 66
World Grain - May 2019 - 67
World Grain - May 2019 - 68
World Grain - May 2019 - 69
World Grain - May 2019 - 70
World Grain - May 2019 - 71
World Grain - May 2019 - 72
World Grain - May 2019 - 73
World Grain - May 2019 - 74
World Grain - May 2019 - 75
World Grain - May 2019 - 76
World Grain - May 2019 - 77
World Grain - May 2019 - 78
World Grain - May 2019 - SUPPLIER NEWS
World Grain - May 2019 - 80
World Grain - May 2019 - 81
World Grain - May 2019 - 82
World Grain - May 2019 - 83
World Grain - May 2019 - 84
World Grain - May 2019 - 85
World Grain - May 2019 - 86
World Grain - May 2019 - 87
World Grain - May 2019 - 88
World Grain - May 2019 - WORLD GRAIN ARCHIVE
World Grain - May 2019 - ADVERTISER INDEX
World Grain - May 2019 - 91
World Grain - May 2019 - 92
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http://digital.world-grain.com/sosland/wg/2007_01_01
http://digital.world-grain.com/sosland/wg/2006_12_01
http://digital.world-grain.com/sosland/wg/2006_11_01
http://digital.world-grain.com/sosland/wg/2006_10_01
http://digital.world-grain.com/sosland/wg/2006_09_01
http://digital.world-grain.com/sosland/wg/2006_08_01
http://digital.world-grain.com/sosland/wg/2006_07_01
http://digital.world-grain.com/sosland/wg/2006_06_01
http://digital.world-grain.com/sosland/wg/2006_05_01
http://digital.world-grain.com/sosland/wg/2006_04_01
http://digital.world-grain.com/sosland/wg/2006_03_01
http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
http://digital.world-grain.com/sosland/wg/2005_12_01
http://digital.world-grain.com/sosland/wg/2005_11_01
http://digital.world-grain.com/sosland/wg/2005_10_01
http://digital.world-grain.com/sosland/wg/2005_09_01
http://digital.world-grain.com/sosland/wg/2005_08_01
http://digital.world-grain.com/sosland/wg/2005_07_01
http://digital.world-grain.com/sosland/wg/2005_06_01
http://digital.world-grain.com/sosland/wg/2005_05_01
http://digital.world-grain.com/sosland/wg/2005_04_01
http://digital.world-grain.com/sosland/wg/2005_03_01
http://digital.world-grain.com/sosland/wg/2005_02_01
http://digital.world-grain.com/sosland/wg/2005_01_01
http://digital.world-grain.com/sosland/wg/2004_12_01
http://digital.world-grain.com/sosland/wg/2004_11_01
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