| Trouble Shooting for Product Defects |
| silver mark, air bubble | Production not glossy |
| reason | solution | reason | solution |
| machine | Nozzle temperature is too high | lower temperature | Raw material is not enough | increase injecting pressure, speed and raw material |
| injecting speed too fast | Reduce speed |
| injecting pressure too high | Reduce pressure |
| mould | mould temperature too low | increase mould temperature | mould temperature too low | increase mould temperature |
| Melting plastic flow improperly in the mould | change injecting sprue location, adjust mould temperature, make plastic part thickness average | Mould release is too much | clear |
| Mould cavity is dirt | check and clear |
| material | Too much moisture in material | dry material, increase back pressure |
|
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| temperature too high | Reduce temperature |
| material dirt | change material |
| material not fully mixed | fully mixed material |
| Mixed grain is not uniform | change to uniform plastic |
| not lubricate enough | add lubrication such as 0.03% NINC STEARATE |
