Though the viscosity of TPEs are reduced when processed at high shear rates, TPEs must be “packed” into a mold to ensure complete fill-out. UV attack by sunlight can be prevented by adding UV stabilizers to polymeric materials. LSR is inherently UV resistant and will not degrade when exposed to UV.

Decrease pack pressure 3. Increase pack pressure 4. Increase pack time 5.

Increase pack and hold pressures. Reduce the pack pressure. Reduce pack and hold pressure.

Sink Marks Melt too hot • Decrease nozzle and barrel temperatures • Decrease mold temperature Insufficient material volume • Adjust transfer position • Increase shot size • Increase injection rate • Increase packing pressure Part geometry too thick • Reduce wall thickness • Reduce rib thickness TROUBLESHOOTING RECOMMENDATIONS PROBLEM CAUSE SOLUTION Flash Injection pressure too high • Decrease injection pressure • Increase clamp pressure • Decrease injection rate • Increase transfer position Excess material volume • Adjust transfer position • Decrease pack pressure • Decrease shot size • Decrease injection rate Melt and/or mold temperature too hot • Decrease nozzle and barrel temperatures • Decrease mold temperature Loose clamp • Reset mold height • Increase clamp tonnage Shrink Too much shrink • Increase cooling time • Decrease mold temperature Too little shrink • Decrease cooling time • Increase mold temperature Burning Process related • Decrease nozzle and barrel temperatures • Decrease mold temperature • Decrease injection rate • Reduce decompression Mold design • 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 injection rate • Increase pack and hold pressure • Increase melt temperature • Increase mold temperature Mold design • Increase gate size • Identify end of fill pattern and verify proper vent location • Add vents or increase vent width • Move gate location TROUBLESHOOTING RECOMMENDATIONS PROBLEM CAUSE SOLUTION Warp Process related • Increase melt temperature • Reduce injection speed • Increase pack pressure • Increase pack time • Decrease mold temperature • 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 • Adjust transfer position • Decrease nozzle and barrel temperatures • Decrease mold temperature • Decrease cooling time Part too hot • Decrease barrel temperature • Decrease mold temperature • Increase cooling time Mold design • 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 Process related • Increase melt temperature • Decrease injection speed • Purge barrel to eliminate material contamination Mold design • Reduce sharp corners in material flow path • Increase venting TROUBLESHOOTING RECOMMENDATIONS PROBLEM CAUSE SOLUTION Discoloration Oversheared material • Decrease melt temperature • Decrease injection speed • 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 TROUBLESHOOTING RECOMMENDATIONS 1.844.4AVIENT www.avient.com Copyright © 2021, Avient Corporation.

Discover the benefits UV light blockers offer for PET beverage packaging Effective UV light blocking additive technology optimizes PET container performance to provide greater protection for UV-sensitive beverages. With UV protection, formulators have more flexibility to use UV sensitive ingredients and not rely on the formulation alone to be UV-stable.

Discover the benefits UV light blockers offer for PET beverage packaging Effective UV light blocking additive technology optimizes PET container performance to provide greater protection for UV-sensitive beverages. With UV protection, formulators have more flexibility to use UV sensitive ingredients and not rely on the formulation alone to be UV-stable.

Increase pack and hold pressure 5. Increase packing pressure 4. Decrease pack pressure 2.

Homepage // News Center // Avient Launches High Performance UV Laser Marking Technology for FEP Wire & Cable Avient Launches High Performance UV Laser Marking Technology for FEP Wire & Cable The new Colorant Chromatics UV Laser Marking technology enables permanent laser marking with very minimal impact to the thinner wire surfaces.

It then freezes after pack and hold and acts as a plug. However, a gate needs to be large enough to provide good packing. This type of packing is what gives the part a good surface finish.

Homepage // News Center // Colorants and Additives from Avient for Sustainable Luxury Plastic Packaging to be Featured at LUXE PACK New York Avient will exhibit at the 20th annual LUXE PACK New York in booth E08, showcasing its range of solutions and services for sustainable luxury plastic packaging. LUXE PACK New York is the premier trade show for creative, luxury packaging taking place at the Javits Center May 10-11, 2023.