Processing Machinery
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PVC Sealing Strip
Fenómeno del problema
Door and window PVC sealing strips hardened and shrank after several years
Análisis de la causa
Plasticizer volatilization hardened and shrank the sealing strip, causing seal failure; 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
Solución
Select low-volatility plasticizer; replace regularly according to service life; use EPDM as replacement in high-requirement occasions; 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
Conclusión clave
Sealing strip hardening is managed by service-life-based replacement; 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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