Material Drying
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PVC Hopper Management
Problem Phenomenon
After PVC granules are stored in the hopper for several days, degradation spots increase
Cause Analysis
Long-term storage of granules causes surface moisture adsorption and changes in stabilizer state; during on-site troubleshooting, 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
Store granules sealed; first in, first out; inspect overdue storage; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PVC raw material storage requires sealing plus first in, first out; after confirming effectiveness, fix 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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