Processing Machinery
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PPO Nozzle Temperature Matching
Problembeschreibung
【Problem Phenomenon】Cold slugs or overheating at the PPO nozzle, and defects in the front section of products recur
Ursachenanalyse
Nozzle temperature is generally about 10℃ lower than barrel temperature (GTX974 data), while SABIC recommends nozzle and melt temperature in the same range of 280-300℃; improper setting causes cold slug blockage or local overheating
Lösung
Start nozzle temperature 10℃ lower than barrel temperature and calibrate with actual measurement; for cold slug head problems, check nozzle heating and bore; for overheating, lower 5-10℃ and verify; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Wichtigste Erkenntnis
PPO nozzle starts 10℃ lower than the barrel; for both cold slugs and overheating, check the measured temperature; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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