Improvements
Plastics extrusion
- Profile distortion cured by flow balancing in the die
- Low production rate cured by cross-flow reduction
- Screw breakage/surface alteration cured by screw geometry modification
- Defects in films cured by screw geometry modification/ mixing section
- Material degradation cured by increasing shear stress near walls (die design)
- Lines in product cured by eliminating back flow + increasing shear stress
Injection molding
- Warped parts cured by proper cooling rate, cavity pressure, filling rate and melt temperature
- Sink marks cured by increasing the injection and packing pressures, the hold and cooling times, decreasing the melt and mold temperatures, modifying local geometric features
- Bubbles and voids cured by proper mold venting and gate location
- Burned materials cured by proper mold venting
- Flow lines cured by proper gate location, cavity filling rate, temperature uniformity
- Gate clouded discoloration cured by reducing the injection fill speed, adjusting the melt and mold temperature, increasing the injection pressure
- Silvery scratches across the surface cured by keeping the granules dry and reducing heating time and temperature