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A twin‐screw extruder with an ultra‐large length‐to‐diameter (L/D) ratio of 136 was developed and applied in the gel‐spinning process of ultra‐high molecular weight polyethylene (UHMWPE). UHMWPE gel fibers with concentrations of 6–18 wt% were produced at barrel temperatures of 150–180°C and screw speeds of 10–40 rpm. The residence time of the UHMWPE gel solution in the extruder increased with the...
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