Material Drying
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PPO Regrind Drying Time Extension
Problem Phenomenon
【Problem Phenomenon】PPO regrind dried the same as virgin material still shows moisture-related defects
Cause Analysis
Regrind particle size differs from virgin material, moisture diffusion rate differs, and drying time should be increased; SABIC also requires regrind to be kept clean to avoid foreign material contamination and attention to its effect on color
Solution
Dry regrind separately with extended time; crush and sieve regrind to keep it clean; evaluate regrind ratio according to application, stricter for drinking water certified and UL parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
When PPO regrind particle size changes, diffusion changes, and drying time must be increased; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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