Appendix 3: Procedure and parameter recommendations
using Expert Mode
© Elma Schmidbauer GmbH
BA_Elmasolvex_VA_EN_Vers.05.2018
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In turn, the parts positioning in the rotating basket influences
the effectiveness of the spinning: The closer the parts surfaces
are arranged to the rotation axis of the rotating basket, the
lower is the effective centrifugal force for spinning off the rinsing
medium.
It follows from this for the use of the spinning that
1. the parts must be positioned as far to the outside as
possible in the rotating basket, favourably for the process
and balanced around the rotation axis,
2. an as high as possible rotation speed (up to 1400 rpm) and
a spinning duration with direction change where liquid is still
spun off (usually a total of 40 = 2x 20 seconds) must be
programmed in Dry1 (
Fig. 16.4
).
The practical spinning duration in individual cases can be
determined using tests with abort after the spinning and
determination of the residual moisture by simply weighing the
parts basket with parts after the spinning.
16.3.2
Vacuum drying
Both parts and basket surfaces as well as the interior surfaces
of the cleaning chamber are evenly dried in the Elmasolvex VA
by
•
evaporation of the last rinsing medium from the mentioned
surfaces with running removal of the evaporated rinsing
medium via the vacuum outlet of the cleaning chamber
and
•
subsequent delivery by heat radiation of the evaporation
heat removed from the mentioned surfaces by rinsing
medium evaporation, output from the heated wall at 2
places on the outside of the cleaning chamber
It results from the uniform vapour pressure of the rinsing
medium in the entire cleaning chamber that the coldest surface
dries the worst, i.e. has the highest residual moisture at the end
of the drying process.
For the maximum achievable temperatures of approx. 65 °C on
the interior wall using the outside heater of the cleaning
chamber the outgoing heat radiation is infra-red radiation with
maximum wave length of 7-10 µm.
With rotating basket, this infra-red radiation only directly
reaches the parts surfaces where there is a direct visual contact
through the rotating basket to the cleaning chamber wall.
