Material Drying
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Product bubbles/internal pores
Problem Phenomenon
A large number of bubbles are visible after cutting the product open, and mechanical properties are significantly reduced
Cause Analysis
PEEK insufficiently dried with moisture content >0.02% (standard drying: 150°C/3h or 180°C/2h); processing temperature too high, material decomposes releasing gas; holding pressure insufficient to compact bubbles
Solution
Strictly implement drying standards (dew point <-30°C); check the performance and operating status of the drying equipment; increase holding pressure to 800-1000bar and extend holding time by 50%
Key Takeaway
Trace moisture at PEEK's extremely high processing temperature (>360°C) can produce a large number of bubbles
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