Processing Machinery
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LDPE Sharkskin
Problem Phenomenon
Sharkskin roughness on the LDPE film surface
Cause Analysis
Shear rate exceeding the critical value causes melt fracture; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Reduce speed or raise temperature; polish the die lip; add PPA aid; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate the effective measure
Key Takeaway
Sharkskin relies on reducing speed, raising temperature, plus PPA; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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