Material Drying
2 views
PVC '2079851475616104458 Bubbling
Problem Phenomenon
Bubbles inside product wall, affecting strength and appearance.
Cause Analysis
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.
Solution
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.
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!