Conveying and dosing tests for copper and graphite powder

A leading supplier of thermostats, thermal switches, wax actuators and temperature mixing valves for the automotive, diesel, heating/cooling and sanitary industries.
Our client came to our test facility for dosing tests in order to qualify and validate the feeding equipment best adapted to their materials.

Equipment tested :
Bulk bag discharge station
Mechanical conveying: archimedean screw
Screw feeder: model D12

Materials tested:
copper powder - density 75 lbs/ft³
graphite powder - density 12.5 lbs/ft³

Thirty test runs were conducted to verify and qualify the flow rates and dosing accuracy.
Repeat results of dosing was one of the main objectives to be taken into account during this series of tests.
The precision requested by the client was +/- 270 gr. on a 270 kg batch; we obtained a dosing accuracy of +/- 50 gr.
Therefore the equipment was validated and the objective was achieved!