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Diffusion force of food packaging bags?

The diffusion force of the food packaging bag is: when the adhesive is in close contact with the substrate, due to the thermal motion of the molecules, mutual diffusion occurs at the interface. The closer the compatibility is, the easier the diffusion will be. The lower the molecular weight of viscous extrusion, the more conducive to diffusion. The substrate is a highly crystalline molecular structure, and due to its dense molecular bonds, intermolecular diffusion is not easy to occur. For example, polyester, although it is a high surface energy material, it is not easy to bond. The reason is that it belongs to the molecular structure of high crystallinity, and the material is very compact. Diffusion makes the interface blurred. You have me and I have you. This kind of force is also a part of the bonding force.

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