Extrusion & Post
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LLDPE film PPA onset time
Problem Phenomenon
Sharkskin not eliminated immediately after adding PPA.
Cause Analysis
PPA takes effect only after forming a coating on the die wall; the addition amount and dispersion state affect the onset time.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Record the onset time to establish a benchmark; ②ensure uniform PPA dispersion; ③initially appropriately increase the addition amount; ④evaluate masterbatch carrier compatibility.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
PPA onset requires a coating formation process; only standardized use can give the best effect.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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