Temperature distributions of molten polypropylene during injection molding

The changes in temperature distributions of flowing polypropylene melt in t he barrel of an injection molding machine were investigated using a designe d experimental rig coupled with a temperature sensing device. The main obje ctive was to study the effect of injection speed on melt temperature measur ement. In the course of the study, the temperature of the melt changed cont inuously with injection time, which was associated with a number of factors , such as shear heating, heat conduction, residence time, and the flows occ urring in the barrel. The experimental results obtained differed (C) 2000 J ohn Wiley & Sons, Inc.