Injection Molding
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PET pressure-adjusted flow characteristics
Fenómeno do problema
Using the temperature-raising method to improve PET fluidity resulted in little improvement in fluidity but degradation and discoloration instead
Análise das causas
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
Solução
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
Conclusão principal
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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