Material Drying
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PA6 Yellowing Overheating Identification
Problembeschreibung
The overall color of PA6 products is yellowish, obviously different from the standard color plate
Ursachenanalyse
Excessive melt temperature or excessive residence time causes thermal oxidation yellowing; excessive drying temperature also pre-yellows the pellets, and the two kinds of yellowing need source differentiation; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Lösung
Measure the actual melt temperature not exceeding 270°C; check whether the drying temperature exceeds 100°C; shorten melt residence time; yellowed material must not be used for light-colored products
Wichtigste Erkenntnis
For yellowing, first distinguish whether overheating is in the drying stage or the molding stage, then reduce temperature accordingly; 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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