Freire M T, Castle L, Reyes F G, Damant A P
Department of Food Science, State University of Campinas-UNICAMP, Brazil.
Food Addit Contam. 1998 May-Jun;15(4):473-80. doi: 10.1080/02652039809374668.
PET packaging materials have been tested for volatile content after exposure to high temperatures. Samples included laminates, bottles, and roasting bags, and were heated at 120 degrees C, 150 degrees C and 230 degrees C for 50 min, according to sample type. Volatiles released from the material were trapped on Tenax, identified by GC-MS and assessed against a 10 micrograms/kg migration threshold limit. Few volatiles were found for samples composed only of PET. Volatiles from laminates varied according to the sample structure, but the main substances identified were not related to PET, but probably came from printing inks and adhesives. It is concluded that the migration potential of PET in high temperature applications is very low and that the formation of volatiles during use is unlikely to cause any special problems in polymer recovery in recycling schemes, provided that other packaging residues are removed effectively.
PET包装材料在高温暴露后进行了挥发性成分测试。样品包括层压板、瓶子和烘焙袋，并根据样品类型在120℃、150℃和230℃下加热50分钟。从材料中释放出的挥发物被捕集在Tenax上，通过GC-MS进行鉴定，并根据10微克/千克的迁移阈值进行评估。仅由PET组成的样品中发现的挥发物很少。层压板中的挥发物因样品结构而异，但鉴定出的主要物质与PET无关，可能来自印刷油墨和粘合剂。得出的结论是，PET在高温应用中的迁移潜力非常低，并且在使用过程中挥发物的形成不太可能在回收方案中的聚合物回收中引起任何特殊问题，前提是其他包装残留物被有效去除。
