The quality of mold electric heating tubes is determined by factors such as power accuracy, electrical strength, insulation, leakage current, service life, corrosion resistance, and appearance dimensions

The quality of mold electric heating tubes is determined by factors such as power accuracy, electrical strength, insulation, leakage current, service life, corrosion resistance, and appearance dimensions

1, Power accuracy: mainly related to the quality of the resistance wire and the manufacturing process level of the factory. Generally, temperature coefficient tests are required before mass production to determine the qualified cold state resistance within the power range.

2, Electrical strength: The factors that affect the electrical strength of mold electric heating tubes mainly include the thickness of the insulation layer, the quality of the insulation layer's raw materials, the length of the mold electric heating tube, the bending radius, and the number of bent R-parts. Nowadays, the cold state withstand voltage of the mold electric heating tube generally requires a breakdown current of 0.5mA at 2000V/1s.

3, Insulation: The main factor affecting the insulation of mold electric heating tubes is the sealing process of the mold electric heating tubes. Generally, after sealing with high-temperature powder, it should reach at least 104M Ω, and medium temperature magnesium powder, medium temperature magnesium powder or modified powder should reach 103 M Ω.

4, Leakage current: mainly related to the temperature when using the mold electric heating tube, the voltage when using the mold electric heating tube, the heating length of the mold electric heating tube, and the quality of the magnesium powder. This is also an important assessment indicator for high-temperature mold electric heating tubes.

5, Service life: The service life of the mold electric heating tube is not only related to the quality of the resistance wire, but also to the quality of magnesium oxide (and the selection of tube material), the selection of resistance wire diameter, and other factors. For the manufacturing of electric heating tubes for air dry burning molds, the surface load should be controlled within 8W/cm2. When selecting the diameter of the resistance wire, the surface load of the resistance wire needs to be calculated to meet the service life requirements.

6, Corrosion resistance: It is a common problem encountered by water heating mold electric heating tubes and air dry burning mold electric heating tubes. In addition to a reasonable selection of material (tube), it is also related to the heat treatment of the mold electric heating tube and the surface condition of the mold electric heating tube.

7, Appearance dimensions: Meet the customer's assembly requirements, reflect the factory's technical, manufacturing, and tooling support capabilities, and also reflect the product's grade and manufacturing level.

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