Material Analysis
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LLDPE material changeover cleaning
Problem Phenomenon
After switching between LDPE and LLDPE, not switching process parameters causes batch defects
Cause Analysis
LDPE and LLDPE differ greatly in rheological properties: die gap, air ring type and temperature settings are all different; changing material without changing parameters inevitably causes melt fracture or bubble instability
Solution
①After material changeover, switch the full set of die gap, air ring and temperature; ②archive and recall parameters by material type; ③downgrade and isolate transition-period products; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LDPE and LLDPE changeover is a full parameter switch; die gap, air ring and temperature are three linked items, none can be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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