Chemical Engineering August 2013 - 24

Focus
mounted around the perimeter. This
releases the optional dust-control covers
and screens for removal and reveals
the entire pan for inspection. The
screeners are available with a choice
of wire mesh or perforated screens
in standard widths of 10, 23, 35 and
47 in. The screen is also available in
100% stainless steel with continuously
welded and polished seams to meet
FDA requirements. - Witte Company,
Inc., South Washington, N.J.
www.witte.com
Backflush screen changers can
reduce material losses
This company recently equipped a
food-packaging-film producer's recycling
lines with backflush screen
changers. The filtration process enables
PET flakes to be processed at a
throughput of 500 kg/h. The backflush
screen changer has a self-cleaning
function, which is activated when the
specified pressure limit is reached.
In this process, a filter screen is automatically
moved out of the production
position, and then backflushed
by the redirected melt stream. The
contamination is removed from the
screen cavity and ejected via the
drain channels. Compared to the use
of a screen-wheel filter, the backflush
screen changer reduced product
losses by 50%, says the manufacturer.
It was also possible to increase
the fineness of the filter mesh, the
company adds. - Kreyenborg GmbH,
Muenster, Germany
www.kreyenborg.com
Clean-in-place sanitary screener
scalps and dedusts
A new sanitary, clean-in-place (CIP)
Vibroscreen Double-Deck Screener
removes oversize and undersize particles
from on-size chemicals, minerals,
plastics, foods, dairy products,
pharmaceuticals and other bulk materials.
The 40-in.-dia. unit contains
two horizontally mounted screens in
a cylindrical housing supported on a
circular base by rugged springs. The
screener is equipped with quick-disconnect
clamps between each screen
frame, providing rapid interior access
for inspection and screen changes. An
integral CIP wash system employs
spray nozzles strategically placed to
emit cleaning solutions, rinsing solutions
or steam for sanitizing the
interior of the screening chambers
without the need to open or otherwise
disassemble the unit. Constructed of
stainless steel with ground and polished
welds, it meets 3-A, FDA and
BISSC sanitary standards, as well
as UL, ATEX, CSA and CE electrical
standards. The unit is also offered
in diameters from 18 to 100 in., and
can operate on a batch or continuous
basis, screening several pounds to 70
ton/h. - Kason Corp., Millburn, N.J.
www.kason.com
■
Gerald Ondrey
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Chemical Engineering August 2013

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