Molds & Tooling
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POM copper-catalyzed degradation
Problembeschreibung
After using copper alloy nozzles or hot runner parts, POM degradation intensifies, and the products discolor with black specks
Ursachenanalyse
Copper is a catalyst for POM degradation; using copper or copper alloy at parts in contact with the melt accelerates chain decomposition; decomposition at high temperature produces formaldehyde and even formic acid, while corroding the mold
Lösung
①Prohibit copper and copper alloys at parts in contact with POM; ②use corrosion-resistant steel for nozzles and hot runners; ③select mold materials that are corrosion-resistant and sufficiently hard; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Copper catalysis is an invisible forbidden zone in POM equipment material selection; material investigation should be included in the acceptance standards for molds and hot runners; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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