Processing Machinery
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LLDPE film material changeover transition
Problem Phenomenon
When changing from LDPE to LLDPE, transition material is large and fluctuation time is long.
Cause Analysis
The two materials have large viscosity differences, and the melt state keeps changing during replacement; heating and speed-up need to proceed step by step.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Adjust temperature and speed stepwise; ②monitor bubble state during the transition; ③record transition time to optimize the process; ④reasonably arrange the changeover sequence.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Material changeover transition is a cost point of LLDPE production; a standardized process can shorten the transition time.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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