fOOD & DrInk PrOcESSIng 31
Egg yolk handling challenge is met
by peristaltic pump technology
n 840 Series hygienic
A food processing
company has turned
to peristaltic pumping
A
peristaltic pump from Watson-
Marlow Bredel is being used
by a Japanese food processing
technology in order to
company to pump egg yolks and whites
meet the demand to
through a chilling process before despatch
pump 60 000 egg yolks
every day – with as few
to food manufacturers who make extra-
breakages as possible. In
thick omelettes that accompany sushi.
doing so its success rate
The pump processes the egg yolks with
leapt from 20 per cent to
a 70 per cent unbroken rate, allowing for
70 per cent. Sean Ottewell a better quality end product and offering
reports.
a 350 per cent improvement on the
company’s previous pump.
Chilling approximately 60 000 egg
Une société agro-
yolks and white every day is no mean
alimentaire s’est tournée
vers la technologie du
feat, but demand is such in Japan that
pompage péristaltique
a solution to this curious processing
afin de répondre à un
dilemma was required urgently.
Fig. 1. In trials, it was immediately apparent that
besoin précis : pomper Sushi in Japan is traditionally
peristaltic pumping left far more egg yolks intact.
60000 jaunes d’œuf par served with omelettes cut into portions
jour avec le moins de bris
measuring up to 2cm thick. To guarantee recovers to create a vacuum and draw in fluid,
possible. Son taux de
that the quality of the omelette matches that of giving the pump its positive displacement action,
réussite a ainsi bondi de
the fine sushi on offer, producers demand as preventing backflow and eliminating the need
20 à 70 pourcent. Un
many unbroken egg yolks as possible. for check-valves when the pump is not running.
reportage de Sean
Ottewell.
However, using a conventional sine pump at Hygienic features of the 840 Series include
the food processing company, only a 20 per cent clean-in-place and steam-in-place sterilisation
of yolks were making it through the pump at full velocity without the need for bypasses,
Ein Lebensmittelver- without damage. The situation had to improve if and stainless steel connectors certified to
arbeitungsunternehmen
existing order levels were to be maintained. 3.1.B BS/EN 10204. The 840 Series offers
hat sich der Peristaltik-
International sales and support for flow rates between 653 and 8140 litres/hour,
pumpentechnologie
Watson-Marlow Bredel pumps is provided in while Bioprene tubing is available in two
zugewandt, um 60.000
Japan by Iwaki Pumps, a 700+ employee company hardness values to provide 2 or 3.5bar pressure.
Eigelbe pro Tag zu
pumpen – mit so wenig
that has been established for over 50 years. Iwaki Furthermore, the pump is quiet at less than
beschädigten Eigelben wie
was challenged by the food processing company 75dB(A) at one metre.
möglich. Die Erfolgsrate
to do better and achieve at least 65 per cent The inverter-controlled pump arrived at
stieg dabei von 20 Prozent
undamaged yolks after pump transfer. the Japanese food processing company and,
auf 70 Prozent. Sean The pump recommended for the job was even though the layout of the output hose was
Ottewell berichtet.
the 840 Series peristaltic metering/transfer far from ideal, the trial commenced. Starting
pump from Watson-Marlow Bredel, largely from a low speed the pump velocity was
because of its ability to meet gentle, yet high increased to 20rpm, which gave the desired
flow hygienic applications. The only snag was flow rate of around 1000 litres/h. It was evident
the lack of reference cases. No one was aware of immediately that a far higher percentage of egg
ever previously trying to pump egg yolks without yolks remained intact after pumping than was
damage. The trial was about to break new ground. previously the case.
Peristaltic pump technology is hygienic by A surprised and delighted number of
its very nature because nothing but the hose or processing staff assessed the yolks and confirmed
tube touches the fluid, eliminating the risk of about 70 per cent were undamaged.
the pump contaminating the fluid, or the fluid The company is now in the process of
contaminating the pump. Peristaltic pumps work upgrading its processing operations to
by compressing a tube element between rotating incorporate the 840 Series peristaltic hygienic
rollers. In between each roller pass, the element pump from Watson-Marlow Bredel. p
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