PE-black

For a constant feeding of sample, we used the optional Vibratory Feeder LABORETTE 24.

Within 3 minutes, the complete sample amount got fed. Afterwards, rotor and sieve ring only use to be minimal polluted.

We determined the present fineness by sieving out with desired min. fraction correlating test sieve with 315 µm. about 59 % of sample is able to pass that test sieve.

To achieve more particles > 315 µm, a lower rotor speed might be set (see following trials).

Grinding has been performed analogue result 1. Grinding sound is a little more harsh, but still fine, we don’t expect to have a much reduced durability when a lower rotor speed will be set and more sheering force will comminute the sample instead of impact force when sample will be hit by the rotor rib.

By sieving of resulting particles, only 54 % of sample uses to be finer as desired (315-750 µm).

Grinding has been performed analogue result 1. Grinding sound is a harsher, but still fine, probably the durability of sieve ring will be reduced lightly when a lower rotor speed will be set

By sieving of resulting particles, only 50 % of sample uses to be finer as desired (315-750 µm).

In our final test, we used a sieve with bigger openings (1,0 mm instead of 0,75 mm trapezoidal perforation).

With maximum speed, only 30 % of sample use to get ground to < 315 µm. Still 70 % of sample are above 315 µm as desired. A few particles might be found which use to be bigger as the desired fraction should be. They can be separated by sieving and might get fed a second time to optimize sample output.