The VDT-12 hot nozzle is a component for a hot runner system consisting of a heater, a hot nozzle and a thermocouple. This hot nozzle is made of stainless steel material, has excellent corrosion resistance, high temperature resistance, and can work stably under high temperature and high pressure conditions.

VDT-12 hot nozzle heater using high-quality electric heating elements, with rapid heating and uniform heating characteristics, to ensure that the liquid in a short time to reach the required heating temperature. The design of the hot nozzle can ensure the smooth flow of liquid into the mold, and can also adjust the opening of the needle valve according to the need to control the flow of liquid. The thermocouple is used to monitor the temperature of the hot nozzle, and can feedback the temperature information in real time to achieve accurate temperature control.

VDT-12 hot nozzle is widely used in injection molding machines, extruders and other plastic processing industry, mainly used to control the heating and flow of plastic raw materials, so as to control the quality and production efficiency of plastic products in the mold. The advantage of this hot nozzle is that it can precisely control the heating temperature and flow of the liquid, improve production efficiency and product quality, and also reduce the waste of raw materials and reduce exhaust emissions, which is friendly to the environment.

The thermocouple of the VDT-12 hot nozzle provides real-time temperature feedback through the principle of thermoelectric effect. When two different conductors come into contact, an electromotive force is generated at the point of contact due to the temperature difference, forming an electric current, a phenomenon known as the thermoelectric effect. In the VDT-12 hot nozzle, the thermocouple consists of two different conductors, one of which is connected to a heater or hot nozzle and the other to a temperature meter or control system. When the temperature of the hot nozzle changes, the thermocouple will generate the corresponding thermoelectric motive force, and the real-time temperature of the hot nozzle can be calculated by measuring the size of the thermoelectric motive force.

Specifically, the working principle of a thermocouple can be divided into three steps:

Thermocouples first convert the temperature change into a thermoelectric motive force signal. Because the two different conductors have different free electron densities, charge transfer occurs at the point of contact, creating a thermoelectric motive force.

The thermoelectric motive force signal is transmitted through the wire to the control system or temperature meter. During the transmission process, the signal may be interfered by the outside world, so it is necessary to carry out signal processing and compensation to ensure the accuracy and reliability of the measurement results.

The control system or temperature meter processes and converts the thermoelectric motive force signal, and finally displays the real-time temperature of the hot nozzle. According to the temperature feedback, the power of the heater can be adjusted in time or the opening of the needle valve can be controlled to achieve accurate temperature control.