Injection molding is a complex technology with possible production problems. They can be caused either by defects in the molds, or more often by the molding process itself. I want to go over some issues that SOLIDWORKS Plastics Professional can help prevent.
Knit line / Weld Lines : Caused by the melt-front flowing around an object standing in a plastic part as well as at the end of fill where the melt-front comes together. Can be minimized or eliminated with a mold-flow study when the model is in design phase. Once the mold is made and the gates is placed, one can minimize this flaw only by changing the melt and the mold temperature.
Sink marks or localized depression (in thicker zones) is caused by Holding time/pressure too low, cooling time too short, with spruless hot runners this can also be caused by the gate temperature being set too high. Excessive material or walls too thick.
Short Shot (or Partial part) is caused by Lack of material, injection speed or pressure too low, mold too cold, lack of gas vents.
Computer Aided Technology Inc.