Material Drying
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LDPE Film Regrind Blending Bubbles
Problem Phenomenon
After blending in regrind, film bubbles and gel particles increase.
Cause Analysis
Regrind has high moisture content and may carry impurities; air brought in by crushed film flakes also affects melt quality.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Re-dry the regrind; ②Control the blending ratio; ③Screen to remove impurities; ④Strengthen plasticizing and venting.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Regrind quality determines the blending upper limit; drying and impurity removal are basic requirements.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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