Material Drying
2 views
PVC Drying 75-90℃
Problem Phenomenon
Silver streaks and bubbles on PVC product surface, extruded profile surface bubbling, appearance unqualified
Cause Analysis
PVC pellets absorb little water but not zero; surface-attached moisture and low-molecular volatiles vaporize at processing temperature; soft PVC plasticizer system absorbs moisture more obviously, bubbles and silver streaks increase with moisture content
Solution
①Pellets dried at 75-90℃ for 1.5-2.5 hours; ②Moisture-affected material extended drying and verified; ③Soft PVC pay attention to moisture management of plasticizer system
Key Takeaway
PVC drying requirement is lower than nylon but cannot be omitted; 75-90℃×1.5-2.5h is the general specification, moisture-affected material must be re-dried; 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!