Brittleness |
| 1. Make sure if materials are pre-dried |
| 2. Lower the rate of applying recycled materials |
| 3. Lower melting temperature |
| 4. Check if materials are mixed-up |
Weld line |
| 1. Increase injection speed and pressure |
| 2. Increase holes of air in weld lines |
| 3. Provide spaces for overflowing in weld lines |
| 4. Extend temperature-fixing time |
Silver streaks |
| 1. Make sure if materials are pre-dried |
| 2. Check if materials are contaminated |
| 3. Lower the temperature of spray pipe |
| 4. Increase molding temperature |
| 5. Reduce injection speed and back pressure |
| 6. Lower the temperature of row materials |
| 7. Enlarge injection hole |
| 8. Shorter injection cycle |
Flashing |
| 1. Check if mold is closed properly |
| 2. Check the position of fixed-plate |
| 3. Reduce injection pressure and injection speed or back pressure |
| 4. Increase mold clamping force |
| 5. Reduce temperature of plastic material |
| 6. Shorten pressure-fixing time and injection pressuring time |