| Short Shots | |
| Possible Cause | Suggested Remedy |
| Melt temperature too low | Increase melt temperature |
| Mould temperature too cold | Increase mould temperature |
| Injection pressure too low | a. Increase first stage pressure b. Increase boost time c. Increase injection speed |
| Insufficient feed | a. Increase shot size to maintain a constant cushion b. Inspect non-return valve for wear |
| Insufficient injection forward time | a. Increase injection forward time b. Increase injection rate |
| Entrapped air causing resistance to fill | a. Provide proper venting b. Increase number and size of vents |
| Restricted flow of material to cavity | a. Increase gate size b. Increase runner size c. Use nozzle with larger orifice |
| Unbalanced flow to cavity in multi-cavity mould | a. Increase gate size b. Redesign runner to provide balanced flow |