Perou A L, Laoubi S, Vergnaud J M
Laboratory of Materials and Chemical Engineering, Faculty of Sciences, University of Saint-Etienne, France.
Adv Colloid Interface Sci. 1999 Jun 1;81(1):19-33. doi: 10.1016/s0001-8686(99)00003-2.
Reusing old polymer packages as new food packages necessitates the coextrusion of tri-layer polymers, the old polymer being located between two virgin polymer layers. As it takes some time for the contaminant initially located in the old polymer, the virgin polymer layer acts upon the food pollution as a functional barrier. With the coextrusion process, the polymer layers are heated up to a high temperature and let cool down in air. During this coextrusion stage, the contaminant diffuses through the package at a fast rate over a short period of time. Then the time of protection of the functional barrier is significantly reduced. The process of the contaminant transfer is especially studied either during the coextrusion stage of the film or in the package-food system at room temperature.
将旧的聚合物包装重新用作新的食品包装需要共挤出三层聚合物，旧聚合物位于两层原生聚合物层之间。由于最初存在于旧聚合物中的污染物需要一些时间扩散，原生聚合物层作为功能屏障对食品污染起作用。在共挤出过程中，聚合物层被加热到高温并在空气中冷却。在这个共挤出阶段，污染物在短时间内以快速速率扩散通过包装。然后功能屏障的保护时间会显著缩短。污染物转移过程尤其在薄膜的共挤出阶段或在室温下的包装 - 食品系统中进行研究。
