Tooling is the assembly of precision machined components attached to discharge end of the extruder(s) that combines the multiple materials (in the case of coextrusion) and forms the final product shape. Coextrusion of film is accomplished by one of two distinctly different types of tooling design; one is Feedblock Coextrusion and the other is Multi-Manifold Coextrusion.
The designs are very different, the operating parameters are very different, but, the end result will be the same if all the defined rules for each are followed. One allows for broader material selection; the other allows for much more flexibility in the number and arrangement of layers.
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