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Burn Marks

1. Enlarge insertion or change position
2. Lower the injection speed or shorter pressuring time
3. Lower spray pipe or pipe temperature
4. Modify the holes of air in the mold

 

Discoloration

1. Clean the material feeding pipes
2. Lower injection speed or shorter pressuring time
3. Increase holes of air in the mold
4. Change to a smaller machine
5. Shorter the injection cycle
6. Lower the temperature of spray pipe
7. Check if material feeding areas and pipe of supply are contaminated

 

Sticking in cavity or core

1. Lower injection pressure and stick on it
2. Lower the mold temperature
3. Change the quantity of material feeding
4. Increase cooling time
5. Shorten mold closing time (male mold)
6. Increase mold closing time (female mold)
7. Check if mold is out-spec

 

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