Collagen Sheets (dry)

The sheet with ~ 6,5 grams of weight was pre-cut with a kitchen knife to fragments with ~ 10 mm width and up to 30-50 mm length.

It took about 90 seconds until the complete sample was fed into the mill. The sound of grinding was typical, and vanished slowly. Only a minimal grinding sound was recognized after 2 minutes. We stopped the mill at this point. Eventually the output could be improved lightly with longer grinding times.

As expected, a small amount of sample remained pre-cut inside the grinding chamber. Electrostatic charged sample was attached below the sieve insert.

We used a small pencil to brush down the charged material into the collecting vessel. The sieve insert was not significantly clogged, surely even higher amounts of sample could be ground this way, too.