Extrusion & Post
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PVC Soft Material Temperature
Problem Phenomenon
Soft PVC extrusion temperature was set to 190°C, and the products turned yellow with a strong odor
Cause Analysis
Soft material contains plasticizer and is more prone to thermal decomposition, and its temperature upper limit is lower than that of rigid material; 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
Soft PVC processing temperature 150-175°C; plasticizer volatility management; check temperature first when the odor is strong; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The temperature window of soft PVC is lower than that of rigid material; 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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