Vibration angle can be infinitely varied during
operation from 30 to 90 degrees in and counter to the main conveying
A three-stage, vibrating fluid-bed dryer for gentle
drying of sensitive food ingredients was designed and delivered for an
This machine type which integrates all the advantages
of batch operation while taking adequate account of the continuously operating
preceding stage was selected following intensive preliminary tests because
it assures exact compliance with and reproducibility of the specified
residence time for the complete product. The elaborated technical solution
the vibrating fluid-bed dryer illustrated below has a fluidizing plate area
of 6 mē.
The dryer's three cascaded product chambers, separated
from one another by pneumatically operated vertical weirs, are clearly visible.
In the first step, the required product is conveyed to the first chamber,
where it is predried with a defined quantity of hot air. When the permissible
product temperature is reached, the first weir opens and the product enters
the second chamber. At the same time, the first chamber is filled with moist
product. The third chamber is filled in the same way, and the product
discharge that follows the drying and cooling process is also based on this
principle. The air flows, air temperature, and residence time are adapted to
the defined product quality requirements in each of the three zones.
During the drying phase, the product bed can be homogenized
with the electronically controlled VARIO motor by applying a vertical
vibration or a vibrating motion counter to the main conveying direction.
In addition, the conveying motion from one chamber to the next and the
discharge from the dryer can be supported by optimizing the vibration angle.
The dryer is manufactured in line with strict hygienic
standards to minimize the risk of germ formation in the sensitive product.
The fluidizing plates, which are assembled from conveniently sized sections,
are locked inside the dryer housing by pneumatically operated eccentric
fasteners and can be easily removed on rollers for cleaning.