How to deal with ignition of high frequency welding machine

The high-frequency plastic welding machine emits high frequency waves of 13.56 and 27.12 MHz when in use. It bonds PVC plastic through high-frequency oscillation generated by the aluminum alloy mold under certain temperature and pressure conditions to achieve the purpose of packaging products. But when in use The high-frequency machine is prone to sparking during the bonding process of PVC plastic, causing the PVC plastic box to burn and the upper mold shroud and the lower mold insulating plate to be damaged. The high-frequency machine sparks when the mold oscillates at high frequency and other substances (including A discharge phenomenon caused by the friction between dust and impurities in PVC plastic). Its harmfulness is a problem that equipment manufacturers and users have been improving and overcoming. Currently, there is no effective solution in the packaging industry.

1. Analysis of the causes of high frequency ignition

1. After the mold is fired, no appropriate methods are used to deal with the dust and black spots left by high-frequency mold flashover;

2. The high-frequency upper mold starts to emit high-frequency machine current before it is completely in contact with the lower mold;

3. The bonding material on the surface of the high-frequency mold has not been properly treated;

4. The mold level adjustment is not level enough. It is easy to cause sparking and damage to the mold;

5. During the heat sealing process, the high-frequency current is adjusted to be too large, which can easily cause the mold to catch fire;

6. The high-frequency processing workpiece medium is mixed with impurities or metal substances;

7. The production quality of the capacitor is not good. The mold has burrs or the edges are too sharp. It is also possible that the capacitor material is too thin, causing tip discharge. That is, the capacitor plate needs a suitable thickness;

8. The mismatch between the capacitor and the circuit produces a standing wave phenomenon, causing the voltage in some places to be equal to twice the normal operating voltage, causing dielectric breakdown.

2. How to deal with flashing when using high frequency waves

1. The level adjustment of high-frequency mold must be adjusted;

2. Every time you debug a new mold, the current should be adjusted back to 0.2A. Then use the harmonizer to slowly adjust the current to a suitable current for heat sealing;

3. If sparking occurs in high-frequency molds, be sure to use a clean rag and add alcohol, gasoline, toluene, etc. to remove the corresponding dust;

4. Certain insulating materials must be used under the high-frequency mold. Welding products required to effectively prevent high frequency breakdown again;

5. The sparking phenomena that occur during the production process of the oscillating barrel mainly include capacitor chips, high-voltage tube holders, etc. The processing method is the same as that of the capacitor regulator;

6. The capacitor sheet should not be adjusted too violently during the adjustment process. The corresponding range should be adjusted slowly. If the edge of the capacitor sheet sparkles during the production process, it may be that the edge of the capacitor sheet has not been cleaned and there are burrs on the aluminum plate. Needs to be smoothed with sandpaper.

3. How to prevent high frequency ignition

1. During the production process of high frequency, the oscillating barrel needs to be cleaned frequently, and it only needs to be blown by an air compressor;

2. High-cycle ignition cannot be avoided because it uses the principle of electromagnetic waves. It can only be said that the frequency of ignition is reduced to the lowest point. It has a lot to do with the material. The material of the material is not easy to cause ignition. ;

3. The stability of high-frequency current in the application process of high-frequency fuses is very important. High-frequency synchronous fuses with unstable current will frequently spark during the production process.