Appendix 3: Procedure and parameter recommendations using Expert Mode
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BA_Elmasolvex_VA_EN_Vers.05.2018
© Elma Schmidbauer GmbH
The rotating basket must resemble an ideal black body as much
as possible, i.e. a dark (black) and non-reflecting surface, so
that it receives (absorbs) the arriving heat radiation as well as
possible and radiates indirectly on the inside to the parts
surfaces.
The rotating basket and the parts must consist of materials with
good thermal conductivity so that the rotating basket can
transfer the arriving radiation heat not only by radiation inward
as black body but also via direct tactile contact to parts
surfaces.
The lower the temperature of the above surfaces due to the
cooling of the evaporation heat removed from them, the slower
the evaporation (only still the vaporisation for deeper cooling) of
the rinsing medium in the vacuum.
It follows from this that
1. the cleaning chamber outside wall heater must be switched
on for the process of parts cleaning with vacuum drying,
2. the basket in Dry2 must be programmed as slowly rotating
(<= 5 rpm) to expose all rotating basket areas, particularly in
the area of the 2 heater elements, to the outgoing radiation
heat from the inner wall,
3. in addition to the resistance to chemicals, rotating baskets
should have
- a material surface resembling an ideal black body,
- a material with good thermal conductivity and
- a material with high heat capacity
4. the unheated and therefore comparably colder cover of the
cleaning chamber with its cover seal is a place favouring
condensation of media vapours; therefore the cover and its
seal must be wiped dry from time to time with a clean lint-
free paper / cloth.
5. Parts with plastic surfaces usually require a longer drying
time and special vacuum parameters.
Under consideration of the elementary physical boundary
conditions of the vacuum drying described above, selection of
the vacuum drying parameters, adjusted for the respective
drying task, of the sequence Dry2 (
Fig. 16.6
) using Expert
Mode is recommended.
This is described in more detail below after a short explanation
of the programmed vacuum drying parameters:
