Processing Machinery
2 Aufrufe
PC Degradation from Excessive Barrel Residence Time
Problembeschreibung
Producing small PC parts on a large machine, products turn yellow and brittle, clearly correlated with the shot volume/machine capacity ratio.
Ursachenanalyse
A small shot volume makes the melt residence time in the barrel too long, and thermal cumulative degradation occurs after exceeding PC's allowed residence time; PC is sensitive to residence time, and a large machine making small parts is a typical high-risk working condition.
Lösung
①Select a suitable machine according to product weight (shot volume 20%~80% of machine capacity); ②Shorten the molding cycle; ③Appropriately reduce the melt temperature; ④Change to a smaller machine if necessary; ⑤Monitor melt residence time to avoid exceeding the limit.
Wichtigste Erkenntnis
PC residence time is a 'hard indicator': machine matching is the premise, a large machine making small parts equals chronic degradation; calculating the residence time when selecting the machine is more effective than adjusting the process afterwards.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!