Processing Machinery
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LLDPE machine-direction strength
Problem Phenomenon
Low machine-direction tensile strength of LLDPE film
Cause Analysis
Insufficient machine-direction draw ratio; when troubleshooting on site, verify item by item according to this mechanism to 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
Increase draw ratio; match blow-up ratio; grade adjustment; 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
Machine-direction strength relies on draw ratio design; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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