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How to avoid it: Start evaluating applications with an eye toward the right color technology rather than relying on what type of equipment is currently installed. By sticking only with what’s known, processors can stunt their growth or even give up market share to more innovative competitors. How to avoid it: Take a serious look at what special effects are available and consider how they might be used to help OEM customers gain market share.

Degraded/ overheated material • Decrease melt temperature • Decrease back pressure • Use smaller barrel • Decrease injection speed Gate location and/or size • Relocate gate to nonstress area • Increase gate size to allow higher flow rate and lower molded in stress Fibers/Minerals on Surface or Uneven Surface Appearance Melt temperature too low • Increase injection speed Insufficient packing • Increase hold pressure and time Processing Guide 5 Sink Marks Part geometry too thick • Reduce wall thickness • Reduce rib thickness Melt too hot • Decrease nozzle and barrel temperatures Insufficient material volume • Increase packing pressure • Increase gate size Flash Injection pressure too high • Decrease injection pressure • Increase clamp pressure • Increase transfer position Excess material volume • Adjust transfer position • Decrease pack pressure • Decrease shot size Melt and/or mold too hot • Decrease screw speed Loose clamp • Reset mold height • Increase clamp tonnage Shrink Too much shrink Too little shrink • Decrease cooling time 6 Nymax Polymer Formulations Burning Process related Mold design • Clean, widen and increase number of vents • Increase gate size to reduce shear Wet material • Check moisture. 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 Mold design • Increase gate size • Perform short shots to determine fill pattern and verify proper vent location • Add vents and/or false ejector pin • Move gate location Warp Process related • Increase pack pressure • Increase pack time Mold design • Non-uniform mold cooling Part design • Non-uniform wall thickness Thermolator incorrect temperature • Check settings • Inspect thermocouple Processing Guide 7 Sticking in Mold Overfilled cavity • Decrease injection rate and pressure • Decrease pack and hold pressure • Adjust transfer position • Decrease cooling time Mold design • Increase draft angle • Polish cores in direction of ejection Part is too hot 1.844.4AVIENT www.avient.com Copyright © 2024, Avient Corporation.

The tool will increase the upcycling of PCR and will help to achieve pledged PCR usage rates.

ZPT proved to be very effective in protecting TPEs, reducing common bacteria populations by 99.9% or more in JIS Z2801 testing, and inhibiting fungal growth (rating = 0) according to the ASTM G21 standard.

ZPT proved to be very effective in protecting TPEs, reducing common bacteria populations by 99.9% or more in JIS Z2801 testing, and inhibiting fungal growth (rating = 0) according to the ASTM G21 standard.

ZPT proved to be very effective in protecting TPEs, reducing common bacteria populations by 99.9% or more in JIS Z2801 testing, and inhibiting fungal growth (rating = 0) according to the ASTM G21 standard.

The tool will increase the upcycling of PCR and will help to achieve pledged PCR usage rates.

We can recommend initial designs or redesigns based on structural and Moldflow® analyses as well as our considerable knowledge of best practices for thermoplastic part design, flow rates and gating.