Processing Machinery
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PPO Nozzle Temperature Matching
Problem Phenomenon
【Problem Phenomenon】Cold slugs or overheating at the PPO nozzle, and defects in the front section of products recur
Cause Analysis
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
Solution
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
Key Takeaway
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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