Material Drying
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PPO Bubbles and Melt Degradation
Problem Phenomenon
[Problem Phenomenon] Internal bubbles in PPO products, holes visible on sectioning, accompanied by slight discoloration
Cause Analysis
Bubbles originate from moisture vaporization or melt overheating degradation producing gas: insufficient drying, melt temperature exceeding 330°C, and residence exceeding 2 hours can all cause them; when accompanied by discoloration, degradation is more likely
Solution
First check drying and moisture content; then measure the actual melt temperature and residence time; for degradation-type bubbles, clean the barrel and lower the temperature and shorten the residence; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO bubbles check water first and then heat; accompanying discoloration points to degradation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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