Processing Machinery
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PVC Transparent Part Yellowing
Problem Phenomenon
Transparent PVC products yellow and transparency decreases
Cause Analysis
Thermal degradation or improper stabilizer system; transparent parts are sensitive to hue; 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
Control temperature and residence; select transparent-grade stabilizer; yellowed material must not be used for transparent parts; 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
Transparent PVC requires transparent-grade formulation plus strict temperature control; 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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