| Trouble Shooting for Product Defects |
| deformation | part with blister |
| reason | solution | reason | solution |
| machine | Too much material | Reduce injecting pressure/speed and stroke | injecting pressure is too low | increase injecting pressure |
| Material near sprue is too loose or tight | increase/reduce injection time | injection time or material is not enough | increase injection time and raw material |
| injecting speed is too high | adjust injecting speed |
| back pressure is too low | increase back pressure |
| barrel temperature is improper | reduce nozzle temperature, increase back barrel temperature |
| mould | production shape/thickness is uniform | redesign the product shape | plastic part rib is too thick | change design/injecting gate location |
| material flow is not uniform in different gate | change injecting gate | runner/injecting gate is too small | repair runner/injecting gate |
| ejection system is not uniform | repair ejecting system | mould temperature is not uniform | adjust mould temperature |
| mould temperature is not uniform | adjust mould temperature | cooling time is too long | reduce cooling time |
| Material of gate nearly part is too loose or tight | change injecting gate size | Mould temperature is too low | reduce cooling time/increase cooling water temperature |
| material | Cooling time is not enough | Reduce mould temperature, increase cooling time,reduce material temperature | Too much moisture | Dry material |
| material temperature is too low | increase material & mould temperature | Plastic temperature is too high | Reduce temperature |
