Processing Machinery
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Shutdown Thermal Stability Management of PEEK
Fenómeno del problema
[Problem Phenomenon] When PEEK production resumes after an interruption, the first batch of products yellows and loses strength, with inconsistent performance
Análisis de la causa
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
Solución
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
Conclusión clave
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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