系统泄漏对薄膜透气性测试的影响

Effect of System Leakage on Permeability Test of Films

目的研究薄膜透气性测试系统泄漏对其测试结果的影响。方法在考虑泄漏和不考虑泄漏的情况下,通过建立基于压差法的不同塑料薄膜透气性测试的数学模型,以该模型为基础进行Matlab仿真,给出仿真结果。结果系统的泄漏直接影响薄膜透气性的测试结果,特别是针对高阻隔性薄膜透气性测试,测试系统的微小泄漏对透气性测试结果影响较大。结论在24 h透气性测试中,透气性测试的客观值约等于实测值减去系统泄漏而引起的误差值,为实际薄膜透气性提供理论依据和参考。

The work aims to research the effects of system leakage for film permeability test on its test results. The mathematical model for different plastic film permeability tests based on differential pressure method was established with the leakage taken or not taken into account. Based on this model, the simulation results by Matlab were given. The simulation results showed that system leakage directly affected the permeability test results of the film, especially for the permeability test of the high barrier films. The small leakage of test system had a great influence on the permeability test results. The objective value of the permeability test is approximately equal to the measured value minus the error caused by system leakage within 24 hours. This provides theoretical basis and reference for the actual film permeability.