Extrusion & Post
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Optical defects of BOPP film
Problem Phenomenon
The film shows visual defects such as gel particles, gels, or haze spots, and the transparency and grade decline.
Cause Analysis
Inconsistent or contaminated resin quality; unplasticized particles and impurities are enlarged into visible defects after stretching; improper processing temperature control can also produce them.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Strengthen incoming resin inspection to reject contaminated batches; ②select high-quality stable resin; ③strengthen filtration; ④stabilize the processing temperature.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Optical defects are traced to the raw material and filtration links; high-transparency film must use high-cleanliness raw materials with high-precision filtration.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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