What is the heating element inside the mold heater? How does it work?

The heating element inside the heating tube is mainly the resistance wire, which is the key component to realize the conversion of electrical energy into thermal energy. The resistance wire is usually made of metal materials with high resistivity and good heat resistance, such as nickel-chromium alloy, iron-chromium-aluminum alloy, etc. When these materials are energized, due to the existence of resistance, Joule heat will be generated, that is, the heat released by the conductor resistance when the current passes through the conductor, thereby converting electrical energy into thermal energy.

The working principle of the resistance wire in the heating tube can be briefly described as follows:

Electric energy input: First, the external power supply inputs electrical energy into the heating tube through the electrodes at both ends of the heating tube.

Mold heating tube

2. Resistance heating: When the current passes through the resistance wire, due to the high resistivity of the resistance wire, the current will be hindered during the flow process, thereby generating heat. The size of this heat is proportional to the square of the current, the size of the resistance and the power-on time, that is, it follows Joule's law (Q = I²Rt, where Q is heat, I is current, R is resistance, and t is time).

3. Heat transfer: The heat generated by the resistance wire is transferred to the outer shell of the heating tube and the surrounding medium (such as the mold) through heat conduction, heat convection and heat radiation. In this process, the insulating materials inside the heating tube play a key role. They not only ensure the electrical insulation between the resistance wire and the outer shell, but also effectively transfer the heat to the outer shell through its thermal conductivity.

4. Temperature control: In order to keep the temperature of the mold constant during processing, the heating tube is usually used in conjunction with a temperature control system. The temperature control system automatically adjusts the power output of the heating tube by monitoring the actual temperature of the mold and comparing it with the set temperature, thereby achieving accurate control of the mold temperature.

In general, the heating element inside the heating tube, the resistance wire, converts electrical energy into thermal energy through the principle of its resistance heating, and transfers the heat to the mold through heat transfer, thereby achieving heating and temperature control of the mold. In this process, factors such as the material selection of the resistance wire, the resistance value, the current size, and the structural design of the heating tube will affect the heating effect and efficiency.