Material Drying
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LDPE Regrind Bubbles
Problem Phenomenon
Bubbles increase in LDPE film blended with regrind
Cause Analysis
Regrind is fluffy and traps air, and absorbs moisture; 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
Densify regrind by pelletizing; drying; control the blending ratio; 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
Regrind bubbles rely on densification and drying; 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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