A cartridge heater consists of a ceramic core surrounded by a heating coil. The coil contains an electrical load, or resistance, which is typically a nickel-chromium alloy. The number of spirals per inch on the wire determines its watt density. The resistance wire conducts the current and heats the sheath and core of the cartridge heater. The sheath is protected by insulation, usually magnesium oxide. A heater’s resistance can be regulated using a thermostat, but many cartridge heaters use a reversible temperature control. Check this out
Heat Transfer From The Sheath To The Metal Part Is Facilitated By The Dielectric Material
Using a general purpose drill to drill holes for cartridge heaters can be quite useful. The drill’s hole diameter must be close to the nominal size of the cartridge heater. This ensures a tight fit and keeps the heating element cool. To maximize the life of your cartridge heater, drill and reamed the holes to achieve a close fit. The tighter the fit, the more efficient the heater will be. Also, a close fit allows the heater to run cooler, which increases its lifespan.
The heat generated by cartridge heaters is localized and extremely effective. They have excellent heat transfer properties and can achieve temperatures of up to 800degC. They are a great choice for localized heating in applications that demand high levels of heat. Because of their high density, they can fit into almost any industrial application, whether it’s a plastic or metal mold, a cartridge heater is the most effective way to apply heat. When installed properly, a cartridge heater will prevent condensation damage while guaranteeing that the glue will flow smoothly.