Plastics Design Principles: Controlled Frictional Heat
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Related links: Moldflow Plastics Design Guide | Moldflow Communicator™ | Moldflow Design Guide: A Resource for Plastics Engineers Runners should be sized so there is shear heat in the runner. For most materials, 20ºC is good target for the amount of shear heat. Some materials can have a much higher level of shear heat. Materials like PVC should keep shear heat to a minimum.
The amount of shear heat is controlled by the size of the runners. The smaller the runner, the more shear heat. Following best analysis practices, the melt temperature is optimized by considering only the part initially. This allows you to design the part to be molded at higher temperatures to achieve the benefits mentioned above. When the runners are sized, the melt temperature entering the sprue is lowered so by the time the material enters the part it is back to the optimized temperature.
Figure 12: Runner with frictional heat
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