Troubleshooting - Burn Spots

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Possible Cause Possible Solution
Mold is insufficiently vented. Make sure vents are clear of obstruction.

Insure vents are deep.

Add vents, if necessary, to assure good operation.
Injection rate is too high. Reduce injection speed.
Screw RPM is too high. Decrease screw RPM.
Back pressure is too high. Reduce back pressure. Minimum is 0.35MPa (50psi).
Clamp pressure is too high Reduce clamp pressure.