Material Analysis
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PSU Melt Temperature and Viscosity Steep Slope
Problem Phenomenon
[Problem Phenomenon] PSU filling difficulty is improved by raising temperature, but slightly higher temperature raises degradation concerns
Cause Analysis
PSU melt viscosity is temperature sensitive: above 330°C, viscosity can drop 50% for every 30°C increase; using this characteristic can significantly improve flow within a limited temperature zone, but the upper limit must be observed
Solution
Use temperature to adjust viscosity in the 330-360°C range to improve filling; measure actual melt temperature to prevent exceeding the upper limit; coordinate mold temperature and injection speed rather than relying solely on raising temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU viscosity halves every 30°C; make good use of the steep slope but hold the degradation upper limit; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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