Molds & Tooling
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Pure PPO Melt 280-330℃ Window
Problem Phenomenon
【Problem Phenomenon】Pure PPO processing temperature is set improperly; below 280℃ stress is large, and above 330℃ performance declines
Cause Analysis
Pure PPO barrel temperature should be designed at 280-330℃: it should not be lower than 280℃, otherwise high in-mold stress is generated, and should not exceed 330℃, otherwise performance declines; the modified MPPO window drops to 260-285℃
Solution
Set barrel temperature at 280-330℃ for pure PPO; 260-285℃ for MPPO; measure actual melt temperature to calibrate set values against drift; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Pure PPO temperature 280-330℃ is a hard window, MPPO is separately set at 260-285℃; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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