Understanding Differences in Hot Runner Heater Technologies – Nozzles
All hot runner systems need a heat source to operate as designed, however not all hot runner systems use the same heating methods. The type of heater technology your hot runner system uses can significantly affect molding performance, part quality, and system cost. No heater method exists that is ideal for every scenario and each one has their own pros and cons but illustrating their differences may help you in understanding your hot runner system a little more and give you a bit more insight on your next purchase. Some hot runner systems may use a mix of heating methods depending on the components of the system and application but for the purposes of this discussion we will focus on nozzle heater elements.
The main types of nozzle heating methods include Embedded Heat Sources (Brazing) or External Heat Sources (Sleeves and Coil). Selecting the right heater element is always a careful balance of performance, reliability, and cost (both initial investment and operating). Many factors are also weighed including industry, mold design, part variables and production requirements.
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