Processing Machinery
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PVC Soft Material Oil Spots
Problem Phenomenon
Soft PVC product surface exudes oil and becomes sticky
Cause Analysis
Plasticizer migrates and exudes—a formulation compatibility or temperature history problem; 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
Select a plasticizer system with good compatibility; control processing temperature; manage storage temperature; 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
Oil exudation of soft material is plasticizer migration, and formulation is the root; 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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