Material Drying
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PPO Drying Temperature Level Differences
Problem Phenomenon
【Problem Phenomenon】Different documents give drying levels such as 80-100℃, 100-120℃, 104-110℃, causing confusion in execution
Cause Analysis
Drying requirements differ by grade: PX1181 is 80-100℃×2-3h, SABIC general NORYL is 100-120℃×2-4h, NHP9023 is 110-120℃×3-4h; the unified goal is moisture content ≤0.02%
Solution
Execute according to the level in the data sheet of the grade used; dehumidifying dryers take the lower time limit, ordinary ovens take the upper limit; after drying, verify with a moisture meter sampling; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO drying levels follow the grade data sheet, with 0.02% moisture content as the unified acceptance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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