Extrusion & Post
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PPA Application for LDPE
Problem Phenomenon
To eliminate melt fracture the extrusion speed is reduced, and the capacity loss is unacceptable
Cause Analysis
Fluoroelastomer PPA forms a dynamic coating on the die wall surface to promote slip; patented technology can quickly clear LLDPE blown film melt defects; dosage and onset time need to be managed
Solution
① Add PPA masterbatch at the recommended dosage; ② switch to maintenance amount after the initial impact dose; ③ evaluate the purging speed of patented PPA systems; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPA lets LDPE have both high speed and high quality; dosage strategy and purging speed are the key points of selection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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