食品包装复合膜的层结构与材质分析方法研究  

Study on analysis method of material structure and compositions of food packaging composite films

作　　者：刘芳 LIU Fang(Toray Advanced Materials Research Laboratories(China)Co,Ltd,Shanghai 200240,China)

机构地区：[1]东丽先端材料研究开发(中国)有限公司,上海200240

出　　处：《中国塑料》2025年第3期25-29,共5页China Plastics

摘　　要：主要采用5种不同的前处理制样方法对市面上的一种食品包装复合膜进行横截面制作,利用扫描电子显微镜(SEM)与能谱分析联用、红外光谱仪(FTIR)对其层结构和材质进行分析。结果表明,该复合膜有5层结构,依次为聚对苯二甲酸乙二醇酯(PET)/无机颜料-聚氨酯(PU)胶-铝蒸镀层/聚对苯二甲酸乙二醇酯(PET)/聚氨酯(PU)胶/聚乙烯(PE);通过SEM观察比较5种不同前处理制样方法的横截面可知,利用超薄切片机的钢刀和钻石刀或者离子研磨装置对多层复合膜制样,截面光滑层结构清晰形貌理想;通过选择合适的制样方法可以大大提高制作理想膜截面的成功率,对极薄金属镀层多层膜的质检和研发有重要借鉴意义。In this paper,five methods of sampling pretreatment were adopted to obtain the cross section of a commercial food-packaging composite film,and its layer structure and material compositions were analyzed by using scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy,and Fourier-transform infrared spectroscopy.The results indicate that the composite film was composed of five layers,including a polyethylene terephthalate(PET) layer,an inorganic pigment/polyurethane(PU) adhesive/aluminum-metallized layer,a PET layer,a PU adhesive layer,and a polyethylene layer in sequence.By observing the cross sections obtained from five sampling pretreatment methods using SEM,it was found that the composite film showed a small layered cross section when sampling with the steel and diamond knifes of an ultra microtome or an ion milling device,exhibiting an ideal morphology with a well-defined layer structure.In summary,an appropriate method can improve the successful rate greatly for obtaining an ideal film cross section.This is very significant for the quality inspection as well as the research and development of ultra-thin metal-coated multilayer films.

关 键 词：食品包装复合膜 扫描电子显微镜 傅里叶变换红外光谱 离子研磨装置 膜截面 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]