Generally, molding defects are caused by part design, mold design, or are process related. This lesson focuses on part design-related shorts shots, a condition where portions of a part remain unfilled. The previous lesson focused on process-related short shots. Injection molding is a complex scientific manufacturing process. By following a methodical set-up process, molders aim to minimize or eliminate common molding defects that affect part quality.
Topics in this lesson include: which part design factors can lead to short shot conditions; how to adjust rib size to eliminate race tracking, air entrapment, and other short shot risks; how gate size and placement can affect injection pressures and short shot risks; why overall nominal wall thickness distribution of part features should be optimized; and how adjusting process parameters can reduce the risk of short shot conditions.