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A method utilizing a single‐screw extrusion tape line, where each sample of tape was analyzed off‐line with a surface roughness tester, was used to screen the effectiveness of process aids in controlling the surface roughness characteristics of extruded LLDPE. The effectiveness of commercial process aids and new silicone process aid candidates was evaluated and compared as a function of addition level, mode of addition, as well as extrusion rate. A new silicone process aid was discovered that shows a significant reduction in surface roughness of both ethylene‐octene and ethylene‐hexene LLDPE copolymers. Beneficial effects on extruder parameters, such as reduction of pressure and current, were also observed.
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Hauenstein et al. (1997) studied this question.
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