Non-destructive detection technology for air-tightness of cigarette packets and the application in the research of moisture migration behavior

Scientific sealed packaging allows the quality of cigarette packets stably by blocking the moisture migration during the process of storage and transportation. The gas diffusion behavior inside the cigarette packets follows the pressure difference method, based on the dynamic pressure drop mathematical model and Bernoulli equation, the self-designed non-destructive detection (NDD) of air-tightness was developed, the effective leakage area (A) was proposed to represent the air-tightness, and the correlation coefficient R between the NDD and the standard method was 0.987. Samples with different air-tightness could be distinguished through this method, and the moisture migration behaviors of samples with various air-tightness are detected. It revealed that under the same environment, as the need of air-tightness for the cigarette package increased, the change of moisture content increased accordingly, and the moisture migration rate of the cigarette packet was exponentially related to the effective leakage area. The correlation coefficient is 0.9884. The NDD for air-tightness of cigarette packet could reduce consumption and cost, enhance the testing efficiency and product quality.