Molds & Tooling
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Uneven PET hot runner temperature
Fenómeno del problema
In multi-cavity preforms, some cavities turn white and some have high AA, with obvious quality differences among cavities, and cavity-by-cavity testing confirms the temperature deviation.
Análisis de la causa
Aging of the hot runner heater bands, inaccurate thermocouples, or temperature controller failure make the actual temperature of each gate inconsistent; cavities with high temperature degrade heavily, and cavities with low temperature fill poorly.
Solución
①Calibrate the hot runner temperature point by point and replace failed elements; ②calibrate the thermocouples and temperature controllers; ③test the quality indicators of preforms from each cavity separately; ④establish a hot runner inspection system.
Conclusión clave
Hot runner temperature uniformity determines multi-cavity consistency; tracking quality data by cavity can quickly locate the problem gate and is the standard management method for preform production.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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