cpp – Process technology for the chemical industry 01.2019

IN A NUTSHELL:
FEATURES AND BENEFITS
The toothed belt can be changed quickly
and easily
allows long-term operation with no need to
clean the pump chamber.
Wide range of applications
These features qualify Varodry for a wide
range of applications. In addition to drying
processes in industrial cleaning systems, the
pumps are also used in freeze-drying as well
as in the pharmaceutical and food industries.
Drying applications are similarly important
in lithium-ion battery production
or in the manufacture of power storage
units.
Another target market is the manufacture of
transformers and other high-voltage components
containing paper insulating materials
that must be absolutely dry. The humidity
is reduced to a few ppm under vacuum.
Here, too, the high water vapour compatibility
is decisive.
In composite applications, on the other
hand, resins must be degassed before use in
order to guarantee freedom from bubbles.
They are then drawn into the pre-evacuated
tissue during the subsequent infiltration. In
both process steps, the resins are degassed
and vapours enter the pump. This is where
the moderate temperature profile of the Varodry
pays off, largely preventing the
formation of deposits and ensuring a long,
trouble-free life.
Among the typical plasma applications are
part cleaning, surface activation and sterilisation,
in which the bacteria are killed by
the hot plasma gases without really heating
the often temperature-sensitive products. In
this kind of application, the chamber is
generally pumped out to a pressure of