THE EFFECTS OF SHEAR IMBALANCES ON INTRA-CAVITY MELT FLOW USING VARYING MELT FLOW RATES IN THERMOPLASTIC ELASTOMERS AND VULCANIZATES

摘要

The high shear developed in a runner creates significant melt variations and is the source of shear induced mold filling imbalances in geometrically balanced runner runners. These same shear induced melt variations can also create unexpected filling patterns in a single cavity mold. If this uneven filling pattern could be manipulated then shear induced melt variations can be used as a tool in industry. The focus of this paper is to find if the filling pattern with thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV) can be manipulated by varying injection flow rate.