不同温湿度下几种软包装膜力学性能的研究

Study on Mechanical Properties of Several Flexible Packaging Filmsat Different Temperature and Humidity

根据我国南北方气候的差异,模拟3种试验环境,考察在不同的温、湿度使用环境下,评估其各项力学性能,为不同需求用户合理的选择包装材料提供参考意见。根据国家发布的最新方法标准进行各项力学性能测试,结合不同试验项目的试验数据,对不同种类薄膜的7个重要力学性能进行了研究。结果显示,在高温高湿试验环境下断裂伸长率、摩擦因数、水蒸气透过量、雾度、润湿张力均高于其他两种环境,最大测试数值分别为654.8%、0.633、13.8 g/(m^2·24 h)、5.8%、73 m·N/m;在低温低湿试验环境下拉伸强度、热收缩率均高于其他两种环境,最大测试数值分别为386.5 MPa、3.2%;表明每种薄膜在不同的性能测试中各有优劣,在日常使用中根据需求来选择。

Based on the difference of climate in the north and south parts of China, three types of test environments were simulated to evaluate the mechanical properties of several flexible packaging films under different conditions of temperature and humidity, and some suggestions were proposed for a reasonable choice of packaging materials for different users. According to the new national standard, seven important mechanical properties were selected to be measured in terms of different test items. The experimental results indicated that the elongation at break, friction coefficient, moisture permeability, fog and wetting tension obtained in a high temperature and humidity test environment were higher than those in the other two environments, showing the maximum test values were 654.8 %, 0.633, 13.8 g/(m^2 ·24 h), 5.8 % and 73 m·N/m, respectively. The tensile strength and the heat shrinkage rate achieved in a low temperature and humidity test environment were higher than those in the other two environments, exhibiting the maximum test values were 386.5 MPa and 3.2 %, respectively. Summarily, each type of films was found to present its own advantages and disadvantages in different performance tests, and the customers could select anyone according to their requirement in daily use.