Visual Analysis of Cavity Filling and Packing process in Injection Molding of Thermoset Phenolic Resin by the Gate-Magnetization Method

摘要

The Gate-Magnetization method developed by Yokoi and coworkers for themroplastics was used to investigate the flow behavior of glass-fiber reinforced phenolic resin compound inside a mold cavity. Plug flow builds up in the cavity with a decrease of the local viscostiy along the cavity wall due to the heat transfer from the wall and shear heating. simultaneously, a high viscosity layer builds up from the crosslinking reaction along the cavity wall. The thickness of the hgih viscosity layer increased as the injection rate decreased. An unstable flow boundary formed between the reacted hgih viscosity layer along the wall and the low viscosity layer just under the layer.