| Lamination | |
| Possible Cause | Suggested Remedy |
| Melt temperature too low | Increase melt temperature |
| Mould temperature too cold | Increase mould temperature |
| Injection rate too low | a. Increase first stage pressure b. Increase boost time |
| Holding pressure too low | Increase packing pressure |
| Gate size too small | Increase gate size for improved filling |
| Contamination | See Discoloration, Contamination |