Migration in food packaging can occur in various forms, depending on the materials used and the conditions under which the food is stored. The following are the primary types of migration:
1. Diffusion Migration
This type of migration occurs when substances diffuse through the packaging material and into the food product. It is influenced by factors such as temperature, time, and the molecular weight of the migrants.
2. Set-Off Migration
Set-off migration occurs when substances transfer from one side of the packaging to the other, particularly in stacked or folded packaging materials. This is common in multi-layered packaging systems.
3. Extractable Migration
Extractable migration refers to substances that can be extracted from the packaging material under specific conditions, such as during cooking or microwaving.
