几种食品包装用塑料膜阻透性能比较  

Comparison on the Barrier Properties of Several Plastic Films for Food Packaging

作　　者：祝爱萍 麦伟明 林锡康 

机构地区：[1]广东省中山市质量计量监督检测所,中山528403

出　　处：《包装工程》2018年第1期74-78,共5页Packaging Engineering

摘　　要：目的研究不同厚度、不同材质的食品包装用塑料膜透氧量、透湿量的变化情况,为食品包装在阻隔性方面的选材提供依据和指导。方法采用压差法和杯式法分别测试塑料膜的透氧量和透湿量。结果单层塑料膜随厚度的增加,透氧量和透湿量均减小,阻隔性能变好。相同厚度的PE,PET,BOPP,PA这4种单层塑料膜中,PA的透氧量最小,PE的透氧量最大,BOPP的透湿量最小,PA的透湿量最大。复合膜厚度增加,其透氧量、透湿量均减小,但减小幅度逐渐变小。塑塑复合膜外层材料厚度不变时,透氧量、透湿量随总厚度变化不太明显,EVOH塑料复合膜的透氧量值和透湿量值较小,通常在5以下,铝箔塑料复合膜的透氧量值和透湿量值均小于1。结论单层塑料膜PA的氧气阻隔性最好,PE的氧气阻隔性最差,BOPP的水蒸气阻隔性最好,PA的水蒸气阻隔性最差。复合膜中,塑塑复合膜的阻隔性主要取决于外层材料,铝塑复合膜的阻隔性最好,含高阻隔材料EVOH的塑料复合膜的阻隔性比普通塑塑复合膜好,其阻隔性可与铝塑复合膜媲美。The work aims to study the change of oxygen and water vapor permeability amount of plastic film for food packaging with different thicknesses and materials, so as to provide basis and guidance for food packaging in the material selection regarding the barrier property. The amounts of oxygen and water vapor permeability of plastic film were respectively measured in the pressure difference method and cup method. With the increase of the thickness, the amount of oxygen and water vapor permeability of the single layer plastic film decreased, and the barrier property became better. Among such four single layer plastic films as PE, PET, BOPP and PA of the same thickness, the oxygen permeability amount of PA was the lowest and PE＇s was the highest; and the water vapor permeability amount of BOPP was the lowest and PA＇s was the highest. With the increase of composite film thickness, both its oxygen permeability amount and water vapor permeability amount decreased, but the decrease gradually became smaller. When the thickness of the outer material of the plastic-plastic composite film remained unchanged, the oxygen and water vapor permeability amount always changed little with the total thickness. The oxygen and water vapor permeability amount of the EVOH plastic composite film was relatively low, generally less than 5. The oxygen and water vapor permeability amount of the aluminum foil plastic composite film was less than 1. Among the single layer plastic films, PA has the best oxygen barrier property and PE has the worst one; BOPP has the best barrier property of water vapor and PA has the worst one. Among the composite films, the barrier property of the plastic-plastic composite film mainly depends on the outer material. The aluminum-plastic composite film has the best barrier property. The barrier property of plastic composite film containing high barrier material EVOH is better than that of the ordinary plastic-plastic composite film and its barrier property can be comparable to that of the aluminum-plastic compo

关 键 词：食品包装 塑料膜 透氧 透湿 阻隔性 

分 类 号：TB484.3[一般工业技术—包装工程]