Processing Machinery
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TPU Back Pressure and Screw Speed
Fenómeno do problema
After increasing back pressure, plasticization improves but discoloration worsens; fast screw speed causes shear degradation
Análise das causas
TPU back pressure and screw speed affect plasticization and shear heat; excessively high back pressure and speed overheat and degrade the melt; too low causes uneven plasticization and unstable metering; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solução
①Set back pressure and screw speed at medium-low; ②For poor plasticization, check temperature first rather than back pressure; ③When discoloration occurs, lower back pressure and lower speed; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
TPU plasticization management is temperature-primary, with back pressure and speed as auxiliary; shear heat is the invisible driver of discoloration and degradation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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