| Trouble Shooting for Product Defects |
| Black spots | black mark |
| reason | solution | reason | solution |
| machine | Plastic is heated in barrel, temperature is too high,or time is too long | Empty plastic and clean barrel, reduce barrel temperature and heating time | The screw rotation speed is too fast, or barrel & screw is not concentric | reduce screw speed, adjust the concentricity of barrel & screw |
| Production has Burning mark when inject into mould | Reduce injection pressure speed | Nozzle hole is too small or temperature is too high | enlarge hole or reduce nozzle temperature |
| There have die corner, make plastic overheat in barrel | Check up area of nozzle and barrel, find and remove gaps or corrosion |
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| mould | Burn mark | Add mould venting groove,change the gate |
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| material | foreign objects in plastic | check up material, empty plastic in the barrel | Barrel temperature is too high | reduce barrel temperature |
| Burn mark | reduce the material temperature |
