Process advantages
Fluid bed granules are very homogeneous. All particles in the
powder mix are sprayed evenly with liquid starting materials. The
type of granulate (size, density, porosity) can be influenced over
a wide range by the adjustment of various parameters.
Principles of operation
Glatt implements this process with different capacities according
to the process requirements, starting materials and the required
product parameters.
Batch Fluid
Bed Systems with batch sizes from 20g
to 1.5t/batch.
Continuous Fluid
Bed Systems with throughputs from 20kg to 5t/h.
Depending on the process requirements, the liquid starting material
is usually sprayed in from above or, in individual cases, from the
bottom (Top Spray or Bottom Spray granulation respectively).
Batch fluid bed
For Agglomeration/Granulation
in batch mode, the dry starting product is placed in the product
container. Here it is mixed vigorously in the heated gas stream,
held in suspension and agglomerated/granulated by spraying with
a suitable bonding material. The product is then dried to the required
end moisture content with high heat and material transition coefficients.
Principle:
Batch fluid bed granulation, Top Spray |
Principle:
Batch fluid bed granulation, Bottom Spray |
Continuous fluid bed
Continuous granulators are sub-divided into several granulation
zones, which are operated at different speeds and temperatures,
e.g. Agglomeration/Granulation
in the first and second sections, drying in the third and cooling
at the end of the process chamber.
Principle:
continuous fluid bed granulation in the Glatt fluid bed (GF)
Top Spray |
Principle:
continuous fluid bed granulation in the Glatt fluid bed (GF)
Bottom Spray |
When granules are to be manufactured from liquid starting materials,
the particles are not agglomerated in the fluid bed but repeatedly
re-coated until the required grain size is achieved
(->
Spray Granulation).
In the batch process, the undersized grains
from the previous batch are used as the starting material. In the
continuous process, the undersized grains are continuously separated
from the product and continuously fed back into the process as germ
material.
|
 |
Principle:
continuous spray granulation
in the Glatt fluid bed (GF)
Top Spray |
Principle:
continuous spray granulation
in the Glatt fluid bed (AGT) |
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