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Freeze drying machine: laboratory of freeze-dried tea operation steps

2020/10/15
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.



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