Fine-tuning process parameters for quality parts
Injection speed determines how fast material enters the cavity. Injection pressure maintains that speed against resistance.
| Stage | Speed | Reason |
|---|---|---|
| Initial 10-20% | Slow | Avoid jetting through gate |
| Middle 50-60% | Fast | Fill while material is hot |
| Final 20-30% | Slow | Avoid flash |
Hold pressure: 50-70% of peak. Hold time: until gate freezes (2-5 sec). Cushion: 5-10mm.