| PROBLEM |
CAUSE |
REMEDY |
| Mould overfills. |
Air pressure too high. |
Reduce air pressure. |
| Wax too hot. |
Adjust temperature. |
| Plates held with uneven pressure/not covering mould. |
Hold plates firmly, distributing pressure evenly over entire mould surface. |
| Mould held too long at nozzle. |
Hold for less time. |
| Mould not filling. |
Air pressure too low. |
Adjust air pressure. |
| Wax not hot enough. |
Adjust temperature. |
| Nozzle plugged. |
Remove and clean. |
| Mould held too tightly. |
Hold without squeezing. |
| Uneven pressure caused by dirty plates. |
Clean plates so surfaces are flat. |
| Air trapped in mould. |
Make air release cuts (vents) in mould. Be sure wax pot is more than 1/2 full. |
| Mould too cold. |
Warm mould. |
| Air bubbles in pattern. |
Air pressure too high. |
Adjust air pressure. |
| Wax pot low on wax. |
Add wax. Be sure that wax pot is more than 1/2 full. |
| Wax too hot or cold. |
Adjust temperature and stir wax to release trapped air. |
| Mould held at wrong angle to nozzle. |
Hold mould on same plane as nozzle. |
| Wax brittle |
Wax too hot. |
Adjust temperature. |
| Wax has been reused. |
Use new wax. Use no less than 50% new wax with reused. Try avoiding using old wax. |
| Moulds cooling too long before opening. |
Inject fewer moulds during production cycle. |
| Using inferior wax. |
Use new wax. |
| Wax discoloured (brownish) |
Wax too hot. |
Clean wax pot (steam or soak in Paracloroethylene); add new wax. |
| Patterns bend easily, wax sticks to mould. |
Wax too hot. |
Adjust temperature. |
| Opening mould too soon or mould too hot. |
Prolong cooling period by working more moulds. |
| Wax Keeps flowing after mould is filled. |
Dirt inside the nozzle. |
Remove and clean nozzle. |
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