Material Drying
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HDPE plum rain season
Problem Phenomenon
HDPE bubble defects increase in the plum rain season
Cause Analysis
Surface-attached water on the material and the moisture content of recycled material increase; 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
Recycled material must be dried in the rainy season; new material is sealed; add drying for moisture-sensitive products; 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
Restore the drying process as needed in the rainy season; 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 future problems
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