Material Drying
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Product bubbles and silver streaks
Problem Phenomenon
Bubbles and silver streaks appear inside and on the surface of PES products
Cause Analysis
Insufficient drying with moisture content exceeding the standard (PES requires 150°C/3-4h drying); processing temperature too high exceeding 370°C causing slight decomposition; holding pressure and compaction degree insufficient
Solution
Strictly implement the 150°C/3-4h drying standard; control barrel temperature at 310-370°C; increase holding pressure and time for full compaction
Key Takeaway
PES processing is extremely sensitive to moisture; drying is the first quality control point
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