Influence of flow pattern development at die entrance and inside annular die on extrudate swell behavior of NR compound

Abstract

SbstractThis research studies influence of the flow pattern at annular die entrance through the inside of annular die flow channel of capillary rheometer on the swell behavior of NR compound. The annular die used in this research was specifically designed to create the specific pattern of Vortex Flow at Die Entrance (VFE) of NR compound. Results of the study showed that the thickness swell ratio was higher than diameter swell ratio by an average of 20% at every die gap size. It was also found that the VFE flow pattern had direct significant influence on the swell behavior of NR compound while extrudating through annular die. Results from the study of the flow pattern could be used to explain why the thickness swell ratio is higher than the diameter swell ratio in every test condition.

Surface treated bagasse fiber ash on rheological, mechanical properties of PLA/BFA biocomposites

“…This force occurs in the form of an apparent shear stress, which was found to increase with increasing shear rate or extrusion rate. At the higher apparent shear rates (25.9-49.4 s -1 ), the effect of shear rate was associated with higher extrusion rates generating greater elastic energies stored in the molten polymer flow increases, which caused the enhanced extrudate swell for both composite systems [13][14][15] . The neat PLA showed a greater swelling than that of the PLA/BFA composites with untreated and surface-treated BFA particles.…”