Process advantages
VG wet granulation is an important technology for the manufacture
of granules, pellets and tablets. Granules from vertical granulators
(also forced, moist or wet blenders) are distinguished by a compact
structure with good flow characteristics, as the product is mechanically
compressed during the process.
Principle of operation
For this process, Glatt offers Vertical
Granulators with batch sizes from 100g to 1t/batch.
The technical design of the process has a significant effect on
the properties of the end product. In the Wet
Granulation process, powder is presented in a vertical granulator
and subsequently moistened or sprayed with molten material. The
shear forces produced by the Z-shaped rotor blades lead to an intensive
mixing of the powder and, with the addition of binder solutions,
to the rapid formation of high-density granulates. The chopper on
the side wall of the container assists the formation of larger agglomerates.
Single Pot process:
With smaller batch sizes (up to 800l) and/or frequently changing
products, granules can also be dried and cooled in the vertical
granulator. The major advantages lie in the gentle product handling
in vacuum up to 10mbar and the comparitively small processing area,
which can be cleaned very quickly and easily.
In systems using the Single Pot method, the container is designed
with a double wall and can be connected to a solvent separator system.
Additional gas-stripping by means of nozzles in the lee of the rotor
blades considerably accelerates the drying of the particles.
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