Production & Quality
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PET filter mesh selection
Problem Phenomenon
Filter pressure differential rises quickly with virgin material sheet; impurities pass through the screen during recycled material production to form gel particles
Cause Analysis
80-120 mesh is sufficient for virgin material, while recycled material needs 200-250 mesh plus a support screen; too fine mesh causes high pressure differential and frequent screen changes, too coarse allows impurities to penetrate and form gel particles
Solution
① 80-120 mesh for virgin material; ② 200-250 mesh plus support screen for recycled and post-consumer material; ③ monitor filtration pressure differential and set screen change thresholds; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Filter mesh is configured by material source grading; fine screens for recycled material are the gel particle defense line, and pressure differential monitoring determines the screen change rhythm; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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