关键词:

迁移, 纸塑包装, 扩散系数

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