Material Drying
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LDPE Film Bubbles
Problem Phenomenon
Visible bubbles appear in the film, and the seal at bubble locations is poor during heat sealing.
Cause Analysis
The raw material moisture content exceeds the standard without pre-drying; cooling water leakage from the barrel or hopper lets moisture enter the melt.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Pre-dry the raw material to reduce moisture; ②Repair cooling pipes and devices to prevent leakage; ③Manage regrind drying separately; ④Strengthen incoming material inspection.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Film bubbles point directly to moisture management; drying and leak prevention correspond to raw material and equipment sources respectively.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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