Abstract: To optimize the airing process of tobacco lamina, clarify the influence rules of different packaging methods on the temperature, humidity, and moisture distribution of tobacco lamina during the airing period, and determine the optimal airing time, central premium CFS tobacco from Hebei Province was taken as the experimental material and three treatments: no inner liner bag, perforated inner liner bag, and non-perforated inner liner bag were set. Low-field nuclear magnetic resonance (LF-NMR) technology was adopted to analyze the moisture distribution characteristics of tobacco lamina, and combined with continuous temperature and humidity monitoring, the moisture dynamic changes of tobacco lamina within a 15-day airing period were systematically explored. The results showed that the three packaging methods had significant effects on the temperature, humidity, and moisture distribution of tobacco lamina, among which the no inner liner bag treatment had the fastest moisture migration rate, the non-perforated inner liner bag treatment exhibited the strongest moisture retention capacity, while the perforated inner liner bag achieved the best comprehensive performance in humidity regulation and moisture uniformity maintenance. Based on the moisture variation rules and practical process requirements, the optimal airing times corresponding to the no inner liner bag, non-perforated inner liner bag, and perforated inner liner bag were determined to be 7 days, 6 days, and 7 days, respectively. The findings of this study could provide a theoretical basis and practical guidance for the precise control of the airing process of tobacco lamina.

Key words: tobacco, moisture distribution, temperature and humidity, airing, packaging method, low-field nuclear magnetic resonance