Why can't I use a threaded cartridge heater for mold heating?
The normal installation method of the mold cartridge heater is to open a hole in the mold. The heating tube is directly plugged into the hole and then connected to the power supply, so that the mold can be heated.
Because the thread diameter of the threaded cartridge heater is larger than the pipe diameter of the cartridge heater, when punching and installing threads, the hole diameter will be much larger than the pipe diameter, so the gap between the cartridge heater and the mold hole will be large. Because air has a hindering effect on heat conduction, an excessive gap can prevent the heat of the cartridge heater from being transferred to the mold in time, which causes the internal temperature of the cartridge heater to be too high and burn out.
For the mold cartridge heater, the most important thing is to ensure that the heat generated by the cartridge heater can be transferred to the mold in time, and the temperature of the material inside the cartridge heater is reduced, so as to effectively increase the service life of the cartridge heater. Therefore, the gap between the diameter of the mold heating tube and the mold hole is generally as small as possible (preferably between 0.1-0.2mm) in order to better conduct heat and extend the life of the electric cartridge heater.