Injection Molding
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PA66 '2079851475616104452 measured melt temperature exceeding standard
Fenómeno del problema
Settings compliant but melt temperature high, products turn yellow.
Análisis de la causa
Shear heat (high speed and high back pressure); actual melt temperature far exceeds the setting; PA66 is sensitive to over-temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solución
①Reduce screw speed and back pressure to reduce shear heat generation; ②measure actual melt temperature with temperature measurement means and calibrate process settings; ③evaluate whether screw compression ratio and mixing capability match this material; ④optimize screw speed and back pressure combination, balancing plasticizing and shear heat; ⑤include actual melt temperature in process monitoring to detect abnormalities in time.
Conclusión clave
PA66 melt temperature='setting + shear': measurement is the truth; narrow-window nylon has zero tolerance for over-temperature, actual melt temperature must be monitored; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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