An Intriguing Array of Extrudate Patterns in Long‐Chain Branched Polymers During Extrusion

The present study highlights a range of surface and volume extrudate patterns that can be detected during the extrusion flow long-chain branched polymers. Thus, four linear low-density polyethylenes (LDPEs) have been extruded using single-screw extruder coupled to an inline optical imaging system. selected LDPEs are outline influence molecular weight branching on types melt instabilities (MFEI). Through system, space–time diagrams constructed analyzed via Fourier-transformation custom moving window procedure. Based number characteristic frequencies, peak broadness, whether they or distortions, three main MFEI types, distinct from those typically observed in short-chain polymers, identified. higher weight, low exhibited all instability including special type instability. Independently appeared stabilizing effect transition sequences by suppressing distortions limiting patters form weak intensity type.