A cartridge heater is a thin, tube shaped heating device used to internally heat machine and process components such as platens, dies and molds, and sealing bars. The heater consists of a hollow metal tube with a wound resistive heater element embedded in an insulating compound inside it. A thermocouple or controller supplies power to the heater element via a set of leads which exit at one end of the tube. The cartridge heater is inserted into a close fitting hole in the material and, once activated, heats it from within. Cartridge heaters are available as swagged or non-swagged and in a variety of sizes and power ratings. resistance wire coil winding machine
Machines or process parts such as embossing platens, thermoplastic molds, and extrusion dies require heating to operate correctly and, in most cases, are best heated internally. Cartridge heaters are devices commonly used to achieve this internal heating and are incorporated directly into the body of the relevant part. The cartridge heater consists of a thermally conductive metal tube, hollow at its center, and capped at one end. An electrical resistance heater element is wound around an insulating core, typically a ceramic compound, and placed into the metal tube. The space between the heater element and tube is then filled with powder such as magnesium oxide by MGO powder filling machine which insulates the element electrically but conducts heat well.
