ABSTRACT
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Plastic extrusion is a steady-state process for converting a thermoplastic (PU) raw material into a Žnished or near-Žnished product. The raw material is usually in the form of plastic pellets or powder. The conversion takes place by forming a homogeneous molten mass in the extruder and forcing it through a die oriŽce that deŽnes the shape of the product’s cross section. The formed material, or extrudate, is cooled and drawn away from the die exit. The extrudate can then be wound on a spool or cut to a speciŽed length.
