An elongational rheometer coupled with a primary extrusion device has been used for the detection of flow limitations in the extrusion of linear low density polyethylenes (LLDPE). The shear rate for the onset of flow defects (fd) was found to decrease with increasing branch length in the LLDPE copolymer, but the severity of fd was greater in butene‐ than in hexene‐ and octene‐copolymers. Studies of partially fractionated LLDPE showed that the critical shear rate for the onset of fd was closely relate…
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