Material Drying
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Cross-Contamination in PEEK Drying
Problem Phenomenon
[Problem Phenomenon] PEEK products show off-color black specks and performance abnormalities; investigation finds the oven was previously used to dry other plastics
Cause Analysis
PEEK processing temperature is extremely high, and trace contamination of foreign plastics carbonizes or degrades to form black specks and damage performance; Victrex explicitly prohibits drying with other materials in the same oven unless there is reliable isolation
Solution
Use a PEEK-dedicated oven or strictly isolate the drying trays; prevent foreign matter from mixing in throughout drying and transfer; manage the regrind grinding process independently to prevent cross-contamination; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
High-temperature materials have zero tolerance for contamination, and PEEK drying and transfer must be dedicated-line use; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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