Extrusion & Post
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Rough Surface and Unmelted Particles in PEEK Extrusion
Problem Phenomenon
The surface of PEEK extruded rods and sheets is rough, with visible white unmelted particles mixed in, uneven plasticization, poor surface gloss, and a granular feel to the touch.
Cause Analysis
Low barrel or die temperature causes the melt to be incompletely plasticized — PEEK's melting point of 343℃ requires sufficient temperature in every zone; an overly large expansion area in the die flow channel also causes stagnation and poor plasticization.
Solution
①Raise barrel and die temperatures to ensure complete melting before entering the die; ②Verify that the actual melt temperature meets the standard; ③Optimize the die flow channel design to eliminate stagnation dead spots; ④Ensure sufficient residence time to complete plasticization.
Key Takeaway
For poor plasticization in PEEK extrusion, first check the temperature system; unmelted particles are direct evidence of insufficient temperature; the die flow channel design must match the flow characteristics of high-viscosity melt.
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