Injection Molding
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PPO Injection Pressure As Low As Possible
Problem Phenomenon
【Problem Phenomenon】PPO products have large internal stress and demolding deformation, and traceability finds the pressure setting is too high
Cause Analysis
The SABIC process parameter table clearly states that injection pressure is recommended as low as possible; the lowest pressure that satisfies filling reduces internal stress and flash
Solution
Gradually lower injection pressure to find the lower limit while ensuring filling; coordinate with mold temperature and melt temperature to compensate flow; perform stress testing on internal stress sensitive parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO injection pressure as low as possible; flow problems are compensated with temperature rather than piled up with pressure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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