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Burn Marks

Causes of burn marks in molded parts
Insufficient air discharging
Burn Marks

Associate knowledge about burn marks
Residual gas inside the injection mould is compressed into high temperature state and burn the material.
Insufficient air discharging will cause burn mark.
Insufficient air discharging will also cause material shortage.

Solutions
Instant: Reduce injection speed.
Short-term: Install more air overflow tanks, add air overflow pin.
Long-term: Apply insert structure mold, which is easier for air to be discharged.

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