Sack Handling
Safe and accurate filling of continuous liners
The system installed today consists of the existing filter dryer, a conical sieve mill as well as the filling station. The core of the supplied system is a Powder Transfer System (PTS) Feeder unit, which is part of the filling station, equipped with a continuous liner system, conceived for 50 kg drums, integrated into a special GMP glove box on load cells. The transfer and dosing unit PTS Feeder sucks the product from the dryer in a closed manner however the powder is not discharged through the standard outlet on the filter dryer but by automated lateral ball valve suction. The PTS Feeder is suited for the emptying and the filling of equipment, the filling and dosing of bags, drums or big bags in one single step.
The unit can be used as an emptying station for several
different installations with low height or low head space and allows the online suction of the powder from the mill between the filter dryer and the filling unit without intermediate steps. In a significant contrast to the cleanroom, the PTS Feeder eliminates the need for many stages, whilst achieving a high containment level and protecting both product and operator. The system is based on the operating principle of the PTS technology: product suction by means of vacuum. The emptying is carried out without pressure, which ensures the accurate filling of the drums. After a preset coarse dosing the system switches automatically to the fine dosing. The product is charged into drums of 50 kg with a precision of 50 g. The continuous liner is installed in the Drum Containment System (DCS). Depending on the process requirement, a positive or negative pressure level can be used. Thus, different pressure levels are maintained inside the continuous liner, inside and underneath the glove box according to GMP guidelines. The drums are tightly closed with the system. For the closed connection and disconnection of the drums an external liner is used. The operator can reach the inner liner through the glove ports of the DCS glove box and pulls the continuous liner into the drum. Before the filling, the liner is leak checked and changed if necessary. The PTS Feeder
automatically fills the drum and the final weight is controlled by a weighing unit. The continuous liner is easily changed without losing containment. A Micro
The concept of different pressure levels: Positive inside the liners
Negative inside the DCS glove box Positive air flow underneath the DCS glove box
34 Solids & Bulk Handling • May 2010
www.solidsandbulk.co.uk
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