Tea (leaves, dried)

For tiny amounts like 10-40 grams, we are offering single use vessels for comminution. Because of the bowler radius of the rotor, a grinding with 14000 rpm is possible without problems.

We prepared a batch of 20 grams (inside a 100 ml vessel) and ground the tea sample for a first minute with maximum speed. After the first minute, all leaves were comminuted; still plenty of particles about 3 mm persisted.

After a second minute, we found mainly particles < 0,5 mm, only a few pieces > 1 mm were present.

After the third minute of grinding, there was no significant improvement in fineness, a few particles about 1 mm were present. Most likely, the weight of this fine particles did not get comminuted by the impact of the rotor. We aborted the trial at this point and packed the sample best possible.

For higher amounts of sample, we recommend a standard grinding vessel. We used 80 grams of sample (about ¼ of max. available volume) for this test.

The Polycarbonate vessel was equipped with a standard knife and a standard silicone lid for our test. The sample batch was ground for 60 seconds at maximum speed. After one minute, we found a few particles about 2 mm length. A lot of fine fraction was formed during this first minute of grinding.

After a second minute at maximum speed, only a few particles about 1 mm were found. Plenty of fine sample was electrostatically attached to the grinding equipment.

The sample was brushed out best possible; the equipment was cleaned rapidly by just running the mill with water and soap. After 30 seconds, the equipment was flushed with fresh water and dried.