Processing Machinery
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LLDPE Stress Cracking
Problem Phenomenon
LLDPE container cracks after being filled with active agent
Cause Analysis
Environmental stress cracking resistance is better than LDPE but still limited; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select a high ESCR grade; reduce stress in structure; compatibility verification; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For stress cracking, select material by ESCR; 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 subsequent similar problems
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