- The concentration of migrant in food at any contact time can be obtained under the tabbar ‘Migration’. In the section ‘Results’ contact time between the packaging material and the food is indicated. The mass and the concentration of the migrant in the food at tc are computed and displayed. The value percentage of migrant in food at tc is the percentage of migrant which diffused relative to the initial amount present in the packaging material.

The change of the migrant concentration is represented from time 0 to time tc. Using the mouse pointer, move the cursor along the curve to calculate the concentration of migrant at a specific time. The corresponding values are depicted in the section ‘Results’. If needed, the diffusion coefficient, the initial migrant concentration in the material and the contact time can be modified. More generally, any previous window (packaging properties or temperature profile) can be re-entered from this point and the parameters can be modified. Once the ‘Run FE Analysis’ button has been clicked, the migration curve is calculated and the corresponding computed data are automatically updated. The new migrant concentration can then be viewed for comparison.