Material Drying
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PEEK Compression Molding Pores and Bubbles
Problem Phenomenon
【Problem Phenomenon】PEEK compression molded products have many internal pores and bubbles, and the density does not meet the standard
Cause Analysis
Air entrapment in the powder and insufficient drying are the main causes of pores; the Victrex compression molding procedure requires 450PF fine powder to be pre-dried at 150℃×3h or 120℃ overnight, and the mold must also be pre-dried at 150℃
Solution
Fully pre-dry the powder and control the material layer thickness; pre-dry the mold to remove moisture; pre-press at 350-700bar to vent air before heating up to melt; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Compression molding pores are controlled by double drying (material + mold) plus pre-pressing venting; 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 similar problems in the future
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