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The German engineering company L.B. Bohle developed an elegant solution for a completely smooth running process in traditional granulation equipment.
The new Compact Unit features a high-shear mixer and fluid bed dryer side by side, complete with sieving step in between.
It has a very compact design. Not only has the width been reduced, but also the installation height is very low. For example, due to the unique lifter for the filter unit inside the BFS fluid bed, an opening in the concrete ceiling for installation of equipment can be avoided. There is no need for a long pneumatic cylinder which would protrude beyond the process tower. Furthermore, the inlet plenum features a reduced overall height. Due to the flat tangential air inlet, the air flow of the distributor bottom has been optimized. The low position of the multi-function outlet valve enables easy operation during feeding and discharging. The height of the transfer tube from the sieve to the fluid bed conveys wet granules in excellent ergonomic and process form. The tube is very short, straight and smooth inside. This transfer layout in combination with the multi-function valve ensures unobstructed flow without elbows or bends. A platform, which is common for traditional 2-level equipment and needs to be cleaned frequently, is not necessary with the new concept.
The innovative Bohle Compact Unit is the new highlight in the field of traditional wet granulation. Of course, the fluid bed system can handle further applications. With the optional spraying system, spray granulation as well as pellet coating and layering processes are possible. Changeover of the product bowl is not necessary. This saves a significant amount of space in the production area.
When it comes to how traditional wet granulation can be realized economically and ergonomically, the Compact Unit is a compelling solution. Featuring many technological advances and inherent safety considerations, the Compact Unit creates the industry benchmark.