Material Drying
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PVC Bubble and Silver Streak Troubleshooting
Fenómeno del problema
Bubbles and silver streaks coexisted on products; drying improved them but not completely
Análisis de la causa
The main cause of PVC bubbles and silver streaks is moisture, but poor venting and degradation gas also produce similar defects; residue after drying indicates a second cause; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①First fully dry to rule out moisture; ②check venting system patency; ③for residual defects check degradation and retention; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PVC gas-type defects are troubleshot along three routes: moisture, venting, degradation; when drying is ineffective, immediately turn to the latter two; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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