The St. John’s Newfoundland plant of Canada Bread Atlantic, (one of Canada’s largest producers of bread and other flour-based products) processes more than 30,500 tonnes of flour annually, requiring an efficient, low-maintenance system to sift the flour upstream of blending and baking operations

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Digital Re-print -
November | December 2014
Sifter Efficiency
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2. F 40 | November - December 2014 GRAIN&FEED MILLING TECHNOLOGY
SIFTER
Efficiency
Overcoming sifting capacity limitations
To meet increased demand for bread in Newfoundland due
to population growth, the plant needed to overcome a
bottleneck in flour screening, which was limited to 3,100
kg/h of capacity (the equivalent of 2.5 bulk bags) using two existing
gyratory box screeners. To boost output the plant installed
two pressurised Centri-Sifter™ centrifugal sifters from Kason
Corporation, which can process 4,500 kg/h, a 43% increase.
Wilfred Verge, maintenance manager at the site, says, “Since the
system is fully enclosed from bulk bag un-loader, hopper and rotary
valve, to sifter to silo, it prevents contamination of the product and
plant environment while increasing capacity," adding, "The old box
screeners were vented through a breather sock that allowed dust
to escape."
Improving sifting efficiency
A bulk bag unloader discharges the contents of 1275 kg bulk bags
into a hopper that has a provision for manual dumping of minor
ingredients. The material is metred by rotary valve into a pneumatic
conveying line, and is directed through a diverter valve into either of
two model MO-PS-SS Centri-Sifter™ centrifugal sifters. One is fitted
with a 30 mesh (600 micron) screen for white flour and the other
with an 8 mesh (2360 micron) screen for whole wheat and "smart
flour," a white whole wheat flour used in Canada Bread’s Smart
Bread brand. Multi-grain bread is created from Smart Bread by add-ing
the seeds and grains during mixing.
Flour entering the sifter’s inlet is fed by a screw into a horizontally
oriented cylindrical sifting chamber, where rotating helical paddles
continuously propel material against the screen, accelerating the
passage of on-size particles through screen apertures. The paddles,
which never contact the screen, also serve to break up soft agglom-erates.
Oversize particles are ejected through the downstream end
of the screen cylinder, and exit through a discharge port.
by Henry Alamzad,
President, Kason Corporation
The St. John’s Newfoundland plant
of Canada Bread Atlantic, (one of
Canada’s largest producers of bread
and other flour-based products)
processes more than 30,500
tonnes of flour annually, requiring
an efficient, low-maintenance
system to sift the flour upstream of
blending and baking operations
COMPANY INFO
Kason
Kason's worldwide compliance with the most stringent safety,
quality and sanitary standards and regulations, as well as our
nearly 50 years of innovative design and vast process experi-ence
makes Kason the leader in the manufacturing of screening
and processing equipment. Whether your application is simple
or complex, low or high capacity, sanitary or industrial, you will
find the specialized equipment and the application expertise
you need for top performance at Kason.
Kason is dedicated to solving the toughest screening, drying
and cooling problems while holding quality, safety and reliability
paramount. It is this focused approach that sets Kason apart
from the competition. We strive to consistently deliver prod-ucts
that meet and often exceed customer expectations with
regard to performance, dependability, ease of maintenance,
price and delivery.
With offices spanning four continents and an expanding
global network of representatives, we are well positioned to
continue to serve our worldwide customer base covering a
range of industries including food, pharmaceutical, chemical,
plastic, energy, minerals, aerospace and defense.
www.kason.com

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5. GRAIN&FEED MILLING TECHNOLOGY November - December 2014 | 43 F
Cleaning is faster
Labour required for cleaning the screener is cut by roughly 90 per-cent,
owing to its stainless steel construction to USDA, FDA, BISSC,
3-A and other sanitary standards, and to the two-bearing cantile-vered
shaft design that allows quick removal of internal components.
The externally-mounted bearings are located between the
screening chamber and motor drive, eliminating the need for a
bearing on the hinged end plate, allowing the retainer plate, screen
cylinder and paddle assembly to slide freely from the shaft end
for cleaning, screen changes or inspection. Wide spacing between
the bearings, a large diameter shaft and a flexible shaft coupling
combine to prevent vibration at high speeds under heavy, imbal-anced
loads.
“The old gyratory box screeners required about 90 minutes to
clean, but the new ones take only 10. We open the end plate, pull
out the basket and paddles, blow them off, and replace them,” notes
Mr. Verge.
“The sifters can handle more than 4,500 kg/h and will meet our
capacity for years to come,” he says.
"Labour required
for cleaning the
screener is cut by
roughly 90 percent,
owing to its stainless
steel construction,
and to the two-bearing
cantilevered
shaft design"

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Outloading
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