Processing Machinery
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LDPE Poor Heat Seal
Problem Phenomenon
LDPE film heat seal strength is insufficient or the seal edge is scorched
Cause Analysis
Heat seal temperature, time, and pressure do not match, or the film surface is contaminated; 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
Calibrate heat seal parameters according to film thickness; clean the film surface; sample check heat seal strength; 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
Heat seal quality relies on parameter calibration and sampling checks; 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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