Material Analysis
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PPO Melt Temperature Grading by Grade
Problem Phenomenon
【Problem Phenomenon】Applying a unified melt temperature to process different NORYL grades results in insufficient filling or degradation
Cause Analysis
Melt temperature differences among grades are obvious: PX1181 is 280-300℃, NHP9023 is 300-325℃, high PPO content grades take the upper limit of the 240-320℃ range; the higher the PPO content, the higher the viscosity and the higher the required temperature
Solution
Set melt temperature according to the grade data sheet; high PPO content grades take the upper limit of the range; when changing grades, change the temperature card synchronously and verify the first piece; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO melt temperature follows the PPO content of the grade; changing material requires changing the temperature card; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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