powder dosing unit / gravimetric / screw / automated

Special advantages:

Differential dosing scales principle
(Loss in weight) regulation
Precise online regulation and rapid correction in the event of target value deviations
Absolute weight acquisition
No falsification of readings due to apparent weight deviations and changing raw material properties
Weighing principle is not influenced by the material column in hopper
No intricate calibration is necessary
Maximum dosing accuracy also for low throughput rates
High grade dosing screws with linear dosing function
Preferred applications:

The new AZOGRAV® dosing system facilitates continuous, gravimetric supply of main and secondary components in extrusion and coextrusion processes. Complete extrusion facilities are effectively controlled by efficient, automated systems.
Tubular films
Flat film (chill roll)
Deep-drawn films and panels
Tubes/pipes and profiles
Spunbonded web
Synthetic thread
Functional principle:
Vacuum conveying systems fill the weighing container for the main component and the storage containers for the secondary components through a material slide gate. The main component runs freely into the static mixing hopper while at the same time the differential dosing scales meter the secondary components into the mixing hopper. The optimum geometry of the mixing hopper ensures an extremely homogeneous mix is achieved during the material feed procedure. Any changes made to the target throughput values in the secondary components have a self-regulating effect on the throughput rate of the main component.