Production & Quality
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EVOH Surface Blooming
Problem Phenomenon
White frost-like low molecular substances exude on EVOH product surface, affecting appearance
Cause Analysis
Low molecular components in EVOH migrate to the surface and exude during storage; lubricant or plasticizer supersaturated exudation
Solution
1) Select high molecular weight EVOH to reduce low molecular substances; 2) Reduce lubricant addition to a reasonable level; 3) Clean product surface then test to identify the source
Key Takeaway
Blooming is caused by low molecular migration and exudation; selecting high molecular weight grade is fundamental
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