Abstract
AbstractAnalysis of a plastic sheet extrusion line was carried out using a 2.5‐in. extruder in conjunction with a three‐roll stack system for processing of both poly(methyl methacrylate) (PMMA) and high‐impact polystyrene (HIPS). Tests conducted include dynamic responses, sheet cooling behavior, velocity and thickness profiles, and frozen‐in strain measurements. Experiments with PMMA were also performed on an extrusion‐air cooling line to provide a basis for comparison with the extrusion‐roll stack system. The results showed that the size and stability of the bank in the extrusion‐roll stack system affected the thickness variations and the frozen‐in strains. Operating the roll stack system was found to allow for fairly rapid rearrangements from parabolic to plug velocity profiles. Line comparisons between the roll stack and air cooling showed that the roll stack minimized thickness variations, frozen‐in strains, and surface flaws.
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