Processing Machinery
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PEEK Melt Viscosity Dual Sensitive Regions
Problem Phenomenon
【Problem Phenomenon】The improvement effect of raising temperature and raising speed on PEEK flow reverses with the temperature range, and the machine adjustment logic is confusing
Cause Analysis
PEEK melt viscosity is sensitive to temperature below 380℃ and sensitive to shear rate above 380℃, and the machine adjustment means in the two ranges are opposite; raising pressure to increase shear is instead more effective in the high-viscosity region
Solution
Below 380℃, adjust temperature as the main means to improve flow; above 380℃, adjust injection speed and pressure as the main means; select the main machine adjustment means according to the actual melt temperature range; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
380℃ is the watershed of PEEK machine adjustment logic: adjust temperature at low temperature and adjust speed at high temperature; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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