What are the insulation performance standards for mold heating tubes?

The insulation performance of mold heating tubes is crucial, which is directly related to the safety and stability of the equipment.

I. Insulation resistance standard

At room temperature, the insulation resistance of mold heating tubes is generally required to be no less than 100MΩ (megaohms). Insulation resistance is a basic indicator for measuring the insulation performance of dielectrics. This high resistance value can effectively prevent current leakage and ensure that the current can flow along the expected conductor (heating wire) under normal working voltage of the heating tube without leaking through the insulation layer to the surrounding environment or the mold. When the insulation resistance is too low, leakage may occur, resulting in an increased risk of electric shock to operators, and will also affect the normal working efficiency of the heating tube.

Mold heating tube

II. Withstand voltage standard

Withstand voltage is also a key indicator for evaluating the insulation performance of mold heating tubes. Usually, mold heating tubes need to be able to withstand a certain high voltage without being broken down. For example, for a mold heating tube with a rated voltage of 220V, its withstand voltage test voltage generally reaches about 1500-2000V. This is to ensure that in actual use, even if there is a momentary voltage fluctuation, the insulation layer of the heating tube can withstand additional voltage shocks to prevent insulation damage. If the withstand voltage is insufficient, when encountering spike voltage in the power grid or other electromagnetic interference that causes abnormal voltage increase, the insulation layer may be broken down, causing a short circuit fault.

III. Insulation material performance requirements

The insulation materials of mold heating tubes also have strict standards. Common insulating materials include magnesium oxide powder, etc. These materials are required to have high dielectric constant, low dielectric loss and good thermal stability. High dielectric constant can ensure effective isolation of current under the action of electric field; low dielectric loss can reduce the loss of electric energy in the insulation material and convert it into heat to avoid local overheating; good thermal stability enables the insulation material to maintain its insulation performance in the high temperature environment when the heating tube is working, and will not appear due to temperature increase. The insulation performance decreases or decomposes.

IV. Environmental adaptability standards

The insulation performance of the mold heating tube also needs to consider its stability in different environments. For example, in a humid environment, moisture may invade the insulation layer and reduce the insulation resistance. Therefore, the insulation layer of the heating tube is required to have a certain moisture-proof performance. At the same time, in an environment with corrosive gases or chemicals, the insulating material cannot react chemically with these substances, thereby ensuring that its insulation performance is not corroded.

In order to ensure that the mold heating tube meets the insulation performance standards, strict quality inspections are required during the production process, including insulation resistance tests, withstand voltage tests, etc. During use, its insulation performance also needs to be checked regularly to ensure the safe and reliable operation of the equipment.