| ELASTRON INJECTION MOULDING TROUBLESHOOTING GUIDE |
| Problem | Solution |
| Flow Marks | Increase melt temperature
Increase mould temperature
Decrease filling time
Increase back pressure
Polish / blast the mould
Increase screw speed
Enlarge the gates and runners
Increase after pressure time
Pre-dry the material |
| Voids | Increase mould temperature
Increase screw speed
Increase back pressure
Increase filling time
Decrease melt temperature |
| Burning | Decrease injection pressure
Decrease barrel and nozzle temperature
Decrease screw back pressure
Decrease screw speed
Decrease melt temperature
Decrease mould temperature |
| Long Cycle time | Decrease screw back pressure
Decrease after pressure time
Check cavity balance
Pre-dry the material
Decrease melt temperature
Decrease mould temperature |
| Sticking in mould | Increase cooling time
Apply non stick surface treatment to the mould
If suitable erode the mould
Increase melt temperature
Increase mould temperature
Increase screw speed |
| Incomplete Fill | Increase injection rate
Enlarge the gates and runners
Enlarge vents
Check vent locations
If necessary apply vacuum to the vents
Increase after pressure time
Increase after pressure |
| Sink Marks | Decrease melt temperature
Decrease mould temperature
Increase cooling time
Decrease screw speed
Clean the semi-finished part
Do not use lubricants |
| Poor or no adhesion in co-injection | Increase melt temperature
Increase mould temperature
Decrease hold pressure
Increase injection rate
Decrease melt and nozzle temperature
Decrease mould temperature |
| Odour and yellowing | Decrease injection rate
Decrease screw speed
Decrease back pressure
If present decrease the temperature of hot runners |