The FILTERMAT® dryer produces coarse or very coarce, 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® PROCEDURE
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.


FILTERMAT Dryer

All flowsheet animations are available in the GEA Niro download area.

FURTHER READING:

Drying and Particle Formation Technologies
Small-scale Spray Drying

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