Processing Machinery
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Grasping the PPO molding temperature window
Problembeschreibung
During PPO production, there is repeated swinging between raising temperature to improve filling and lowering temperature to prevent degradation, and the process window cannot be stably fixed.
Ursachenanalyse
PPO's thermal decomposition temperature reaches 350℃ and there is no obvious degradation within 300℃, but the high viscosity requires high temperature to improve flow; the nozzle temperature needs to be 10℃ lower than the barrel to prevent drooling; multiple constraints narrow the window.
Lösung
①Set the barrel temperature at 260~290℃ and the nozzle 10℃ lower as the baseline; ②prioritize compensating flowability through pressure and speed rather than unlimited temperature increase; ③calibrate by actually measuring the melt temperature; ④strictly prohibit arbitrary changes after the window is fixed.
Wichtigste Erkenntnis
PPO temperature management should fully utilize the 300℃ stable zone; the nozzle temperature difference is the key detail for preventing drooling; fixing the process window requires cross-departmental confirmation.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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