食品软包装复合膜热封过程的变形仿真分析

针对食品软包装复合膜热封时容易出现变形和起皱的问题，采用ANSYS 有限元仿真软件的热单元模块对典型的透明复合包装袋薄膜PET/PE/CPP和不透明复合包装袋薄膜PET /AL /PE 进行热变形仿真，分析热封温度、热封时间、冷却温度、热刀宽度及包装袋尺寸对热封变形的影响。结果表明，相同条件下，PET/PE/CPP的变形量约为PET/AL/PE 的变形量的6倍多；仿真条件下，热封温度为140℃，热封压力为0．5MPa，热封时间为0．5s，冷却温度为25℃，热刀宽度10mm；在包装袋长度和宽度相的条件下，可以获得较小的变形量。

Deformed Simulation Analysis of Flexible Food Packaging Composite Membrane in Heat Sealing Process

For the flexible food packaging is easy to appear deformation and wrinkle problem during heat sealing,deformation simulation of typical transparent composite packaging film PET/PE/CPP and opaque com-posite packaging film PET/AL/PE were set up by the thermal unit module of ANSYS finite element simulation software,and the influences of heat sealing temperature,heat sealing time,cooling temperature,hot knife width and packaging size were analysised.The results show in the same conditions,the deformation of PET/PE/CPP was over six times than the deformation of PET/AL/PE.Acorrding the simulation results,the smaller deforma-tion should be obtained when the heat sealing temperature was 1 40℃,heat sealing pressure was 0.5MPa,heat sealing time of 0.5 s,cooling temperature was 25℃,hot knife width was 1 0 mm,and the packaging length ap-proximately equal to the packaging width.