Extrusion & Post
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PVDF Film Fisheyes and Raw Material Cleanliness
Problem Phenomenon
【Problem phenomenon】PVDF films have many fisheye impurities, and the premium grade rate after slitting is low
Cause Analysis
Raw material impurities, carbonized degraded material, and unmelted high-molecular-weight components form fisheyes on the film surface; they appear in batches when extrusion filtration and cleanliness management are inadequate; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Increase screen mesh count and optimize the screen change cycle; sample check incoming raw material cleanliness; thoroughly clean carbonized material before startup; distinguish fisheye types and treat accordingly; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Film fisheyes are a cleanliness test; screen mesh, raw material, and cleaning are grasped on three lines together; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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