HDPE is not recommended for purging as it can cause delamination or lead to black specks. Sink Marks Melt too hot Insufficient material volume • Increase shot size • Increase packing pressure Part geometry too thick • Reduce wall thickness • Reduce rib thickness Flash Injection pressure too high • Decrease injection pressure • Increase clamp pressure • Increase transfer position Excess material volume • Decrease pack pressure • Decrease shot size Melt and/or mold temperature too hot Loose clamp • Reset mold height • Increase clamp tonnage Shrink Too much shrink • Increase cooling time Too little shrink • Decrease cooling time Burning • Reduce decompression • Clean, widen and increase number of vents • Increase gate size to reduce shear Wet material • Verify material is dried at proper condition Nozzle Drool Nozzle temperature too hot • Decrease nozzle temperature • Decrease back pressure • Increase screw decompression • Verify material has been dried at proper conditions Incorrect nozzle • Use reverse taper tip Weld Lines Melt front temperatures are too low • Increase pack and hold pressure • Increase gate size • Identify end of fill pattern and verify proper vent location • Add vents or increase vent width • Move gate location Warp • Reduce injection speed • Increase pack pressure • Increase pack time • Increase cool time Mold design • Non-uniform mold cooling Part design • Non-uniform wall thickness Thermolator incorrect temperature • Check settings • Inspect thermocouple Sticking in Mold Overfilled cavity • Decrease injection rate and pressure • Decrease hold pressure • Decrease cooling time Part too hot • Decrease barrel temperature • Increase cooling time • Increase draft angle • Polish cores in direction of ejection Black Specks Contamination • Purge machine Degradation • Reduce melt temperature • Reduce screw speed • Reduce back pressure Machine related • Check for wear on screw, barrel or check ring Delamination • Purge barrel to eliminate material contamination • Reduce sharp corners in material flow path • Increase venting Discoloration Oversheared material • Decrease melt temperature • Reduce residence time Mold design • Increase gate sizing Dry material • Check moisture of material to ensure it is within the recommended moisture percentage for molding 1.844.4AVIENT www.avient.com Copyright © 2021, Avient Corporation.

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GEON M3900 BLACK 2880 FDM 126950 BN PA6 MASTERBATCH BLACK

BLACK PVC DB3813 BLACK 99000Q1 QuantumOne RESIN MASTERBATCH

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183593 GY SAN MASTERBATCH GEON FC900 BLACK 2999 PP-CP4D/000 HF2 BLACK

JA6A-BLACK/211-45 71964 GN PET MASTERBATCH 201B/BLACK

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