Material Drying
3 Aufrufe
PA6 Silver Streaks and Bubbles Differentiation
Problembeschreibung
Filament-like streaks and bubble defects appear simultaneously on the PA6 product surface; after moisture treatment the bubbles disappear but the filament-like streaks remain
Ursachenanalyse
Bubbles are mostly formed by moisture vaporization, while filament-like silver streaks may also be caused by degradation gas, shear heat or entrapped air; treating only for moisture cannot eliminate silver streaks of non-moisture causes
Lösung
First take a material strip for air shot observation: containing bubbles indicates a moisture problem, transparent but with filament streaks indicates shear or degradation; for moisture silver streaks strengthen drying, for shear silver streaks reduce injection speed and shear heat
Wichtigste Erkenntnis
Silver streak treatment first distinguishes the cause, and air shot observation is the fastest identification means; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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