Material Drying
3 Aufrufe
PBT drying 110-120℃×3h
Problembeschreibung
PBT products show silver streaks, bubbles, darkened color, surface spots, and decreased mechanical properties
Ursachenanalyse
Although PBT has low moisture absorption, it is sensitive to moisture at high temperatures: residual moisture in the 250-270℃ melt hydrolyzes ester bonds and degrades molecules, manifested as darkened color, surface spots and performance deterioration
Lösung
①Dehumidifying drying at 110-120℃×3 hours; ②reduce moisture content to below 0.02%; ③sealed storage after drying and use within a limited time; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PBT drying is the precondition for its high-temperature processing; 110-120℃×3h is the standard specification of manufacturers such as Polyplastics, and hydrolysis damage is irreversible; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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