| Trouble Shooting for Product Defects |
| Short shot | sink |
| reason | solution | reason | solution |
| machine | Injection pressure is too low | increase injection pressure | Lack of material | increase injection distance |
| Lack of material | increase screw injection distance | injection pressure is too low | Increase injection pressure |
| Injection time is too short | increase injection time | holding pressure is too low | Increase the holding pressure |
| injection speed is too slow | increase injection speed | injection time is too short | increase the injection time |
| Back pressure is too low | increased back pressure slightly | injection speed is too low | increase injection speed |
| Screw or check ring is worn | check or change | screw too big or check ring is worn | change new one |
| The screw diameter is too small | change to a bigger one |
| mould | mould temperature is too low | increase mould temperature | The gate is not suitable | adjust the gate |
| mould temperature is not uniform | adjust the mould temperature | mould temperature is not uniform | adjust temperature |
| air is trapped in mould | Modify mould venting |
| Mould gate is not suitable | Adjust gate | Product rib is too thick | check up the product |
| runner or gates is too small | enlarge the runner or gates |
| material | material temperature is too low | increase material temperature | material temperature is too high | reduce the material temperature |
| Material lubricat inadequate | add lubrication |
