Processing Machinery
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Shutdown Thermal Stability Management of PEEK
Problembeschreibung
[Problem Phenomenon] When PEEK production resumes after an interruption, the first batch of products yellows and loses strength, with inconsistent performance
Ursachenanalyse
PEEK has good thermal stability but with time boundaries: 360℃ can be maintained for 1 hour without obvious degradation, beyond 1 hour it should be lowered to 340℃ which can be stable for several hours, and if more than 3 hours is expected the barrel must be purged; the first batch of material after restart carries heat history and should be discarded
Lösung
For interruptions within 1 hour, keep 360℃ and continue; for 1-3 hours, lower to 340℃ for heat preservation; for over 3 hours, purge thoroughly; scrap and record the first several shots after restart
Wichtigste Erkenntnis
PEEK shutdowns are handled in 1-hour/3-hour graded levels, and the first shot after restart must be scrapped; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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