Molds & Tooling
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Difficult Cleaning of Carbon Deposits in PEEK Hot Runner
Fenómeno del problema
After the PEEK hot runner system has been used for a period of time, carbon deposit spots appear and black specks are carried out with the melt, the risk of gate blockage rises, and conventional purging compounds are difficult to displace it completely.
Análisis de la causa
The PEEK processing temperature exceeds 380℃, and melt in hot runner dead spots and stagnation areas continuously thermally degrades and carbonizes; ordinary purging compounds have insufficient temperature resistance and cannot effectively displace residues at the PEEK process temperature.
Solución
①Use a PEEK-specific high-temperature purging compound or decomposer to clean according to the procedure; ②Shorten the melt residence time in the hot runner; ③Optimize the hot runner design to eliminate dead spots; ④Lower the hot runner temperature and drain it when shutting down.
Conclusión clave
PEEK hot runner maintenance must use a dedicated high-temperature cleaning solution; tracing carbon deposit black specks should include hot runner dissection inspection; lowering temperature and draining at shutdown is a low-cost, high-return habit.
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