Injection Molding
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PPO Injection Pressure Range
Problem Phenomenon
【Problem Phenomenon】PPO filling pressure is insufficient causing short shots; after increasing pressure, flash and stress problems appear again
Cause Analysis
Increasing injection pressure is beneficial for PPO melt filling of the mold, generally controlled at 100-140MPa; NPL gives a wider range of 60-150MPa; high-viscosity materials have high pressure requirements but over-pressure must be prevented
Solution
Set injection pressure within the 100-140MPa window; for short shots, prioritize raising temperature combined with raising pressure; for flash and stress parts, check clamping force and holding pressure; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO injection pressure 100-140MPa is the baseline window; raising pressure combined with raising temperature achieves balance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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