Material layer
A material layer is a separate layer within a plastic package consisting of a single primary material or polymer. This layer:
- Usually has a thickness of more than 1 micrometer (1µm = 10⁻⁶ m).
- Is applied to films via coextrusion or lamination. In injection-molded packaging, multiple layers can be formed during multi-shot injection molding or coextrusion.
- It forms a functional material layer on its own.
- It is often used as a barrier layer or structural component in packaging.
Example: an EVOH layer in a multilayer film.