| Trouble Shooting for Product Defects |
| product stick with mould | runner stick with mould |
| reason | solution | reason | solution |
| machine | injection pressure is too high | reduce injection pressure | injection pressure is too high | reduce the injection pressure |
| Screw injection distance is too long | reduce distance | Screw injection distance is too long | reduce distance |
| holding time is too long | reduce time |
| mould | mould temperature is too high or low | adjust mould temperature | Sprue and nozzle isn’t suitable | adjust |
| There have ejection angle in mould | remove it | runner cooling is is not enough | extend cooling time or reduce cooling temperature |
| mould surface is not smooth | polishing mould | runner ejection angle inadequate | Add angle |
| Ejection cause mould vacuum | opening or ejection slowly, or add venting groove for mould | runner surface is not smooth or undercut on runner | Repair mould |
| slider is not in correct position | repair mould | Runner damaged | Repair mould |
| no runner lock pin | add runner lock pin |
| material | material temperature is too high | reduce the material temperature | material temperature is too high | reduce the material temperature |
