Processing Machinery
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TPE Back Pressure and Screw Speed
Problem Phenomenon
After increasing back pressure, plasticization improves but discoloration intensifies; high screw speed causes shear degradation
Cause Analysis
TPE back pressure and screw speed affect plasticization and shear heat; excessive back pressure and speed overheat and degrade the melt; too low causes uneven plasticization and poor color masterbatch dispersion; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Set back pressure at medium-low to ensure dispersion; ②Moderate screw speed; ③Increase back pressure when color masterbatch dispersion is poor; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE back pressure is the balance between dispersion and shear; color masterbatch dispersion relies on back pressure, degradation prevention relies on low speed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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