In many packaging and industrial applications, there is need for structures combining multiple properties such as:

          Mechanical strength                                                       Sealability at high at low temperature

         Barrier to oxygen or water vapor                                 Abrasion resistance

         Flexibility (or rigidity)                                                     Gloss surface

         Moisture and chemical resistance                                Transparency or Opacity

In many cases, the combination of these properties cannot be achieved by using a single material. For this reason manufacturers propose multilayer structures that exhibit amix of the individual performances of the polymers involved in the structure.

As most of the polymers are incompatible an adhesive layer also called tie layer is needed to obtain sufficient cohesion. Figure below show an example of multilayer structure.

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