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The reason why the high frequency welding machine can't seal materials

The reason why the high frequency welding machine can't seal materials?


The high-frequency welding machine utilizes the principle of the polarized high frequency electric field to bond materials. The advantage is that the heat is even, the adhesion is reliable, and there is no carbonization. It is the most commonly used packaging equipment in the packaging industry. The high frequency welding machine is a kind of high-frequency sealing equipment, also called high-frequency machine. When using high-frequency machine to work, various problems will occur, causing the machine to not work normally. So how to solve these common problems! Hope the following can help everyone.


Choice of materials for the high frequency welding machine:


To determine whether the material is suitable for high frequency welding (it must contain more than 30% PVC), whether the high-frequency connection is correct (make sure the high-frequency output is normal); whether the welding time and pressure setting is reasonable (set according to the type of material and thickness); whether the mold design is reasonable ( To ensure that the pressure can be well transmitted to the welding surface) ; whether the temperature setting is reasonable.


Causes and troubleshooting of high frequency welding machine failure


1. Turn on the power, you can hear the low frequency "buzzing" sound of the power transformer of the high frequency heat sealing machine, touch the automatic micro switch, the solenoid valve can be closed, open the cover, and found that the tube filament is reddish, and the measured voltage is lower than the normal voltage. It is judged that the load may be disconnected from the "buzzing" sound. After measuring the high-voltage rectifier circuit, there are two high-voltage rectifier silicon particles that have broken down. Using two silicon particles with a withstand voltage of 20KV to replace, they can be heat-sealed normally, that is, troubleshooting.

2. The high-frequency heat sealing machine is turned on and the power light is on. The heat sealing solenoid valve can be closed, but it cannot be heat closed. The high-voltage rectifier circuit is normal when the cover is opened, and the filter inductance is normal. The brightness of the tube filament is normal. The fault location is concentrated on the resistance-capacitance oscillation circuit. The grid resistance is normal when the power is cut off, and there is leakage in the two high-voltage oscillation capacitors, indicating that the oscillation conditions are damaged, the capacitors are broken down, and high-frequency electric fields cannot be generated. After replacing the withstand voltage capacitors, the high-frequency heat sealing machine is normal, that is, the fault is eliminated. The above is the investigation and brief description of the two failure phenomena of the high-frequency heat sealing machine that cannot be heat-sealed.

3. The oscillator tube is not bright, please change the electron tube.

4. The resistance of the high frequency heat sealing machine is broken down, please change the resistance.

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