Laboratory in research of lyophilized tea, can according to relevant data, through the tea with freeze drying machine (
Hereinafter referred to as tea freeze drier)
To the preparation of freeze-drying of tea.
General laboratory freeze-dried tea operation steps are as follows:
tea leaves by eutectic point tester is measured the eutectic temperature of P;
Then put fresh tea in the tea frozen in advance within the freeze dryer set pre freezing temperature 5 ~ 10 ℃ lower than the eutectic temperature, freeze-drying machine speed of temperature drop in for tea 2 ~ 5 ℃ / min, reaches the set temperature warm after 1 ~ 2 hours;
Will the tea vacuum freeze drying machine to 1.
Between 5 ~ 20 pa, and the drying temperature set in -
35 ℃ ~ insulation eutectic temperature P between 0.
5 ~ 2 hours;
In the same vacuum drying temperature increased to 15 ℃ ~ 35 ℃, insulation 2 ~ 5 hours.
Stop the tea of vacuum freeze drying machine processing, then released to atmospheric pressure with the drying process of tea.
freeze-dried tea with the laboratory test, to facilitate large-scale freeze-drying tea production.
