Injection Molding
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PET pressure-adjusted flow characteristics
Fenómeno del problema
Using the temperature-raising method to improve PET fluidity resulted in little improvement in fluidity but degradation and discoloration instead
Análisis de la causa
The rheological characteristic of PET melt is that pressure has a greater influence on viscosity than temperature; raising temperature has limited viscosity-reducing effect but accelerates degradation; the correct path is to adjust flow through injection pressure
Solución
① To improve flow, prioritize adjusting injection pressure rather than temperature; ② set temperature only according to the window baseline; ③ high-pressure fast filling reduces the cold material layer; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PET is a pressure-sensitive material; adjusting pressure rather than temperature is the basic logic of '2079851475616104452 operation, and raising temperature to adjust flow is a common misconception; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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