采用脉冲电晕对非极性的食品包装薄膜聚乙烯(PE)和聚丙烯(PP)进行表面处理,研究了电晕处理时的4 种因素(即放电功率、电极与薄膜间的距离、走膜速率和导辊温度)对薄膜透气率的影响,探讨了电晕处理后薄膜的透气率和薄膜的表面张力值之间的关系,建立了电晕处理对薄膜透气率的影响规律。结果表明,电晕处理对薄膜的表面张力和薄膜的透气率有明显的影响,为建立电晕处理与薄膜透气率之间的数学模型和气调包装设计提供了可靠的薄膜透气率数值计算。

The surface of non-polar food packaging film of polyethylene (PE) and polypropylene (PP) was treated by pulsed corona. The influence of four factors of the pulse corona treatment on air permeability of the film was studied, which were the discharge power, the distance between thin film and electrode, film moving speed, and the guide roll temperature. The relation between film surface tension and film air permeability after corona treatment was discussed. The influencing rule of corona treatment on film air permeability was established. The results showed that corona treatment has significant influence on surface tension and air permeability of the film. The purpose was to provide reference for establishing mathematical model between corona treatment and air permeability of film, and reliable numerical calculation of film air permeability for modified atmosphere packaging design.