Molds & Tooling
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PBT flowability sudden change above melting point
Fenómeno del problema
After the temperature rises above the melting point, flowability suddenly increases, and flash and drooling suddenly intensify
Análisis de la causa
PBT has a clear melting point, and flowability increases sharply when the temperature rises above the melting point; this sudden change characteristic requires precise temperature setting, and requires vigilance against mold flash and nozzle drooling
Solución
①Set temperature considering the melting point sudden change characteristic; ②improve mold mating surface precision to prevent flash; ③control nozzle temperature to prevent drooling; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PBT's melting point sudden change is its process characteristic; the sharp increase in flowability is both an advantage for thin-wall filling and a risk of flash and drooling; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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