Production & Quality
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PVA surface frosting precipitation
Problembeschreibung
PVA product surface precipitates white frost-like low molecular substances affecting appearance
Ursachenanalyse
Low molecular components in PVA migrate to the surface during storage and precipitate; lubricant or plasticizer supersaturated precipitation
Lösung
1) Select high molecular weight PVA to reduce low molecular substances; 2) Reduce lubricant addition to a reasonable level; 3) Clean the product surface and then test the source
Wichtigste Erkenntnis
Frosting is caused by low molecular migration and precipitation; selecting a high molecular weight grade is fundamental
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