Predictive Migration Model for Organic Contaminants from Printed Paper (Board) Food Packaging Materials into Food

摘要

The organic contaminants which in the printing inks or varnish of paper (board) surface can migrate via paper (board) to the packed food (simulants) in the form of gases and do harm to the health of consumers. To predict the concentration of them in the packed food (simulants) at a given storage time, the migration model of them was established. For a sheet of paper consists of several layers of interlaced fibers, the organic contaminants can be traped by the fibers when they penetrate to the inner layers by the capillaries in the printing process, so the linear coefficient of retardation R_m was introduced to modify the Fick's Laws, and the diffusion equation R_m(partial derivC/partial derivt) = D_p(partial deriv~2C/partial derivx~2) was gotten. It demonstrated that the values of Rm increase with the increasing of molecular weight of surrogates, and decrease with the increasing of migration temperature. And the diffusion coefficients D_p of phenol, 2, 6-Dissopropyl naphthalenes (2, 6-DIPNs) and dibuthyl phthalate (DBP) in the kraft paper board were range from 10~(-5) to 10~(-4) at 75°C and 100°C. Then the migration model was validated by migration experimental tests, and the model described the profile of the experimental values very well.