The FILTERMAT® dryer produces coarse or very coarse, agglomerated
or granulated free-flowing dustless powders.
The conventional
spray dryer layout can handle drying at a certain temperature; any drying at a
lower temperature requires a FILTERMAT® dryer.
The drying of
hygroscopic, thermoplastic and slowly crystallising products involves handling
of very sticky intermediate materials at a lower temperature level than that
possible in conventional spray dryer layouts.
Completion of drying
requires the powder to be processed at close to critical conditions for a long
time.
THE FILTERMAT® PROCEEDURE
The FILTERMAT® spray dryer uses nozzle atomization in a co-current tower
that directs the semi-dried particles downward onto a moving belt. The material
is then gently conveyed as a porous layer through zones of post-drying and
cooling, resulting in a crisp cake-like structure, which breaks up at the end
of the belt and is discharged through a final particle size control system. The
exhaust air streams pass through the material layer on the belt.
FURTHER READING:
Processing Plants for the Food & Dairy Industries - Catalogue
(PDF)