| Trouble Shooting for Product Defects |
| joint line | flow mark |
| reason | solution | reason | solution |
| machine | injection speed is too slow | increase injecting speed | injecting speed too slow or quick | Adjust injecting speed |
| injecting pressure is too low | increase injecting pressure | injecting pressure is too high/low | Adjust injecting pressure |
| mould | mould temperature is too low | increase mould temperature | mould temperature is too low | Increase mould temperature |
| Mold release is too much | Reduce mold release | injecting sprue is too small | enlarge injecting sprue |
| runner, injecting sprue is too large/small | Check and repair | Part thickness is differ too much | change design or injecting |
| Mould venting is blocked | Add venting groove |
| distance between parting line and gate is too far | change gate location |
| material | plastic melting is not good | increase material temperature or back pressure | plastic melting is not good | increase material temperature & back pressure |
| material is dirty | Check raw material | Material is dirt | Check raw material
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