Cellulose

A manual pre grinding step use to be required before sample can be fed to Variable Speed Rotor Mill PULVERISETTE 14. We used a scissors for cutting the material to ~ 5-8 mm. Afterwards, grinding can be performed without problems.

Eventually, sample can be ground even finer by using a smaller sieve ring for a second comminution (see result 2).

Pre ground sample of result 1 got fed a second time to the machine, using a 0,5 mm sieve ring. Possibly also a direct grinding of sample might be possible for comminution.

It took about 4 minutes until the last particles have been fed to machine. All sieve openings have been free (no blockage), for this, a grinding of higher amounts of sample is possible. Also a higher feed rate might be possible for comminution.

After grinding, cleaning can be performed rapidly by vacuuming with a soft brush.

Also a Universal Cutting Mill PULVERISETTE 19 is capable for a comminution of bigger particles.

A direct grinding with a 0,5 mm sieve cassette uses to be performed rapidly. Majority of grinding sound stopped after about 10 seconds. Afterward, only a low improvement in output is expected.

We aborted the grinding process after 20 seconds.

Only a few particles use to be left inside the grinding chamber, lying loose on top of the sieve cassette. A grinding of higher amounts of sample is possible.

Cleaning of the grinding chamber can be performed rapidly by vacuuming with a soft brush.