Feedblock film coextrusion tooling consists of a feedblock and a standard flat film die.
The feedblock accepts the inputs of the various extruders (one for each material) and arranges them in a predefined, segregated, fluid sequence and discharges them in a square or rectangular shape for entry into the film die.
The film die takes this combined stream of fluid materials and reforms it or distributes it into a flat thin film. The material sequence formed in the feedblock is exactly the same as the layer sequence of the final film structure
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