Abstract:

Paper or recycled paper containing contaminants can be used for food packaging if the food is protected by a functional barrier made of plastic.It is important to research the migration of chemical compounds from these materials.The problem of contaminants transfering through the packaging into food was studied from a theoretical viewpoint.According to the actual system of paper/plastic packaging-compound-food，diffusion equations were built based on one-dimensional Fick diffusion theory.Different diffusion coefficients D_P and D_C of contaminant in paper and plastic，limited paper thickness，and partition coefficient k_CP between paper and plastic were considered in the model.Analytical solutions were obtained under specific initial conditions and boundary conditions.In addition，the model universality used for the same bilayer plastic-compound-food system after simplification of the model was discussed.Then analysis was made between the model built and the Laoubi-Vergnaud model.The results showed that the model built can be used not only for the compound migration prediction from paper/plastic material，but also for the compound migration prediction from bilayer plastic material.

Key words:

迁移, 纸塑包装, 扩散系数

摘要：

以真实纸塑包装-化学物-食品体系为依据，基于一维Fick扩散理论，考虑化学物在纸和塑料涂层内具有不同的扩散系数及纸的厚度为有限厚，引入纸和塑料涂层界面处的分配系数，给出初始条件和边界条件，建立迁移预测模型，得到解析解。同时，对模型进行简化处理，分析其用于双层同种塑料-化学物-食品体系的使用通用性，并与Laoubi-Vergnaud模型进行对比分析，结果发现所建模型不仅可用于纸塑复合包装材料中化学物的迁移预测，同时还可用于双层同种塑料包装材料中化学物的迁移预测。

关键词:

迁移, 纸塑包装, 扩散系数