Tea

200 grams of the fennel-anise-cumin-tea sample was ground with our first trial. The sample was packed into our stainless steel vessel. Because we don’t provide desired dry ice, we placed the vessel into our super freezer with – 60 °C temperature for about one hour.

Analogue a comminution with dry ice, we used the cryo-lid to allow gassing CO2 to escape. With dry ice grinding, we recommend starting the grinding process with lower speed setting (by programming of an SOP), when the standard knife is used.

We programmed, direct comminution of the sample in 5 second intervals with 10.000 rpm speed. After two intervals, we found particles with a max. length of 3 mm and plenty of sample material < 0,5 mm.

The temperature after 10 seconds of grinding was still below 0°C (still frozen); we ground the sample two further intervals a 5 Seconds. Fine fraction was not significantly reduced afterwards. A bit less of sample with 3 mm max. length was shown after 20 seconds of total grinding time.

Higher amounts could be fed for a similar comminution. Be aware that more of sample might slow down the used knife.