Material Drying
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PVC '2079851475616104458 Bubbling
Fenómeno del problema
Bubbles inside product wall, affecting strength and appearance.
Análisis de la causa
Sheet contains moisture or volatiles (old stock sheets moisture-absorbed), regrind contamination; water vapor/volatiles form bubbles when heated; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solución
①Pre-dry sheets to remove moisture and volatiles; ②Check regrind cleanliness; ③Control storage conditions, do moisture-proofing well; ④First-in first-out for raw materials and sheets, control inventory cycle; ⑤Control heating temperature within material safe window.
Conclusión clave
PVC '2079851475616104458 bubbling = 'moisture and volatiles': sheet pre-drying and moisture-proof storage are key; old stock sheets especially must be moisture-tested before going on line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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