Containers are classic systems for the internal transport and storage of intermediate and final products. Container systems have been used successfully for a long time in the area of containment. A distinction is made between split-valve and split-cone container systems.
Washing in place is only possible to a limited extent in the case of container systems. The level of automation is also an advantage when container systems are used. Container systems can be transported using AGVs (automatic guided vehicles) and automatically discharged, filled and cleaned.
Figure 1 Cone system at the container outlet
In the container outlet, there is a closure cone which is paired with a flexible counter-cone at the discharging station. The container is emptied when the cone is raised (see Figure 1).
Figure 2 Containment installation with a split-cone system in pharmaceutical formulation
The cone discharges the product and also functions as a containment system. By automatically adjusting the stroke of the cone, a predefined volume can be discharged from the container. The cone can be used as a dosing system. The discharging station is then placed on weighing cells (loss in weight), or weighing takes place during the next process step (gain in weight). The different height settings of the cone make it easier to discharge different substances. Partial discharging of the container is possible.
Another advantage is that the large outlet cross-section facilitates the discharge of poor-flowing products.
Sealed cone systems are also available for discharging big bags (see Figure 3). The benefit of this system is that the big bag is used as a single-use system. This means that time-consuming cleaning of the container is not necessary. The purchase price is lower than a similar container-based system. Another advantage of a flexible container is that it is better suited to poor-flowing products than a stiff container.
Figure 3 Cone discharging system with big bags
A special containment lid is attached to the container inlet. The securely closed lid is removed from the container inlet by the filling head. The container lid is secured in the receptacle of the filling head in such a way that the filling head and container lid are largely free of residual product when filling has been completed. The filling head is located above the container filling station and is docked onto the container inlet using a lifting device (see Figure 4).
Figure 4 Container filling system
Containment in mechanical systems such as the split-cone system or the containment transfer unit depends largely on engineering precision during manufacture and regular maintenance. Visible elimination of dust is only possible to a limited extent when this system is used. An OEL value of 10-100 µg/m3 can be achieved.
SKAN AG, Allschwil, Switzerland
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