The number of layers possible with a feedblock type of tooling is, for all practical purposes, unlimited. Additionally, feedblocks can be designed as modular units. This provides the capability, with simple part charges, to produce viturally any combination of materials or layer structure, as long as the primary rule of rheology matching is followed.
Feedblocks are the industry's method of choice where multiple film structures, or structures containing more than about three layers are the operational objective.
This image represents the material flow in a feedblock and die combination where three different materials are combined together in the feedblock and dispensed into a mono-layer die to produce a three-layer film. Note that each material input into the feedblock originates from a different extruder. The three materials are stacked inside the feedblock and continue into and out of the die in the exact order as the finished film.
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