Material Drying
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PPO Over-Temperature Baking and Aging
Problem Phenomenon
During PPO drying, temperature is raised or time is extended in pursuit of speed, the raw material ages, turns yellow and loses toughness, and product performance deteriorates.
Cause Analysis
Over-temperature and long-time baking of PPO is strictly prohibited; excessive drying causes the material to age, turn yellow and lose toughness; inaccurate temperature control of drying equipment causes local overheating; excessively thick material piles are heated unevenly.
Solution
①Strictly dry according to the 90~120℃×4~6 hours specification; ②calibrate the temperature control of drying equipment; ③keep material layer thickness moderate to ensure uniformity; ④downgrade yellowed material.
Key Takeaway
Both insufficient and excessive PPO drying produce defects; standardized temperature and time is the only correct path; equipment temperature control accuracy needs regular calibration.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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