Material Drying
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PVC Bubble and Silver Streak Troubleshooting
Fenómeno do problema
Bubbles and silver streaks coexisted on products; drying improved them but not completely
Análise das causas
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
Solução
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
Conclusão principal
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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