Material Drying
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Black or dark speck impurities appear on the surface or inside the product
Problem Phenomenon
Black or dark speck impurities appear on the surface or inside the product, randomly distributed, affecting appearance and transparency
Cause Analysis
Incomplete cleaning of carbon deposits in barrel or screw
Impurities mixed in during raw material packaging or transportation
Carbonized residue from flash overflow in mold vent grooves
Foreign materials mixed into regrind
Insufficient cleaning of drying equipment
Solution
Regularly clean the barrel and screw
Strengthen raw material inspection and storage management
Clean flash overflow in mold vent grooves
Strictly separate regrind to avoid mixing materials
Clean drying equipment
Key Takeaway
Black specks need to be addressed from cleaning management and raw material purity
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