Abstract: A temperature control for mold cavities was realized during injection-molding process by a graphene-assisted rapid heat cycle molding technology, and an intensive investigation indicated that the improvement of the surface temperature of mold cavities could reduce the temperature difference between mold surface and melt, and also resulted in a decrease in heat exchange. This made the melt have a low viscosity and prevented glass fiber depositing on mold surface when cooled. In this case, the glass fiber-floating phenomenon on the surface of injection-mold parts could be well prevented. Fiber-floating defects could be completely eliminated when temperature of the mold cavities was set to 120 ℃.

Key words: polypropylene, floating fiber, graphene, rapid heat cycle molding, glass fiber, reinforced