PC-JUN09-PGS15.OK:PC-JUN09-PGS15.OK.qxd 03/06/2009 08:30 Page S15
Focus Food processing & packaging
Drives ensure there’s no crying over spilt milk
Juicy profits available
with right treatment
Problem: Yoghurt producer have an efficiency of 96%, will generate electricity cost Problem: Retentate is a by-product of
Yoplait runs three 8 hour shifts which, according to Lenze, savings of more than £3000 a cross flow filtration in a fruit juice oper-
and requires perfect control in year for Yoplait. ation and mainly consists of retained
order to achieve high process One advantage of the trub particles which were not able to
consistency and quality. smd is its pluggable pass through the membrane, as well as
Solution: Lenze has supplied 85 memory chip that holds all valuable fruit juice. Disposing of this
inverter and geared motor the parameters and settings puree like, viscous retentate results in
drives for use on a new con- of the drive. In the unlikely high disposal costs.
veyor system. The smd inverters event of failure, the chip Solution: GEA Westfalia Separator
have power ratings of 0.37 and can be unplugged, the advocates dealing with the problem
0.75kW and are mounted in drive replaced and the either by avoiding the production of it
panels above the conveyors original chip plugged back or by processing it when it is produced.
Both powers have the same in. The conveyor is then The company says membrane technol-
compact footprint and the ready to run again thanks ogy is the most efficient method of
larger inverter is just 9mm to a repair process that juice filtration, concentrating the solids
deeper allowing plenty of takes only a few minutes, in the retentate, thereby reducing the
space around the drives so that and does not require any retentate volume. Ceramic membranes
no cooling fan is required. The programming knowledge. can achieve up to 90% by volume of
geared motors are Lenze type Lenze solids, which is three times what poly-
GKR – a right angle bevel T: 01234 321321 Enter 235 mer membranes achieve. This level of
design. These GKR gearboxes www.lenze.co.uk concentration of retentate does not
require any further processing.
Increased yield
Stretch line conveyor boosts productivity
The quantity is also reduced if
decanters are used for juicing to pro-
Problem: Conrad Schulte & Co., a The design of the SL system duce the lowest trub level. The solids
Problem: Cranswick Country Foods German biscuit manufacturer, compensates for the stretch in content can also be minimised with a
wanted to improve efficiency, yield and needed to improve manufactur- the chain caused during opera- separator for clarifying the juice, mean-
tray integrity on its pork steak process- ing productivity. tion; as a result the chain does ing the trub quantity which forms the
ing line. Solution: The latest conveyor not have to be shortened and retentate is limited from the beginning.
Solution: The company has invested in a system technology from Schüco downtime can be minimised. By placing a centrifuge upstream of fil-
Marel Food System’s Portion and Pack Design Industrial Automation, Product widths of 20-200mm can tration, the solids content can be reduced
system. It consists of the OptiCut volu- available in the UK through be accommodated. to below 0.5% by volume or to trace lev-
metric portioning machine and the labour Autarky Automation, has been Autarky Automation els by adjusting conditions and products.
saving Quickloader, and delivers fixed- installed. T: 01342 311388 Enter 237 This increases the service lives of filters
weight pork steak portions directly into The CS 090 SL (Stretch Line) www.autarky.com and interruptions for cleaning are
trays ready for sealing and packing. conveyor system transports reduced. The solids can be disposed of
The OptiCut has improved cutting the cooled cakes and pas- with the pomace and accordingly do not
accuracy, optimising the portioning tries to the packaging area constitute separate waste.
process and increasing yield. Also, where production assistants If a disc stack centrifuge is used in a by
‘giveaway’ has been reduced. The sys- place the baked pastries pass arrangement, then a smaller
tem has been able to reduce the number into their respective packag- machine will be required.
of people on the line from six to two. ing. The conveyor ends Retentate can also be collected in a
Marel Food Systems with the single blister pack- separate tank and at the end of filtration
T: 0116 284 3500 Enter 236 ages being hermetically it can be clarified parallel to normal
www.marel.co.uk sealed, ready for despatch. production. It is diluted with water and
clarified in the decanter. The clarified
Tasty electricity savings for Wigan pie company
juice downstream of the decanter has a
residual solids content of 0.5% by vol-
Problem: The installation of a new power even for a small reduction compressor operates at speeds ume and can be recycled back into
production line, complete with in speed. For example, a 10% between 1500 and 3600rpm at ongoing production.
spiral freezer, prompted Poole’s speed reduction gives 30% less 100% slide valve position, thus GEA Westfalia Separator
Pies of Wigan to assess its energy energy consumption. operating at optimum efficiency T: 01908 576512 Enter 239
efficiency, particularly its refriger- A single 315kW screw com- for any given speed. www.gea-westfalia.co.uk
ation systems. These can account pressor is used to provide refriger- The screw compressor uses a
for as much as 70-80% of a food ant for the spiral freezer. An ABB low harmonic, ABB industrial
manufacturer’s electricity bill. drive permits energy saving at drive, which minimises har-
Solution: Seward Refrigeration part load conditions. The screw monic interference on the mains
has installed two ABB drives to supply and avoids the use of
run two of the major components complex solutions to ensure con-
in the refrigeration system. The formity with G5/4 requirements.
company hopes to cut electricity The drive operates at unity
costs by 11%. This reduction will power factor, allowing reactive
see costs cut by over £6200, repre- power charges to be avoided. The
senting a payback of 2.3 years. standalone design gives the drive a
The condenser is an evapora- small footprint, minimising space
tive type with the fan controlled requirements in the control room.
by an ABB standard drive, ABB
Variable speed operation of the T: 01925 741111 Enter 238
fan gives significant reduction in www.abb.co.uk/energy
Process & Control JUNE 2009 S15
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