How to deal with high frequency ignition

How to deal with high frequency ignition?

high frequency high frequency

high frequency plastic welder high frequency plastic welding machine

The high-frequency plastic welding machine emits high-frequency waves of 13.56 and 27.12 MHz when it is in use. It uses the high-frequency oscillation generated by the aluminum alloy mold to bond PVC plastic under certain temperature and pressure conditions to achieve the purpose of packaging products. But in use The high-frequency machine is very easy to catch fire during the PVC plastic bonding process, causing the PVC plastic box to burn, and the surrounding knife of the upper mold and the insulating plate of the lower mold to be damaged. The ignition of the high-frequency machine is caused by the high-frequency vibration of the mold and other substances (including It is a kind of discharge phenomenon caused by friction between dust and impurities in PVC plastics. Its harmfulness is a difficult problem that equipment manufacturers and users have been improving and overcoming. At present, there is no effective solution for the packaging industry.

1. Cause analysis of high frequency ignition

1. The dust and black spots left by the high-frequency mold flashover are not treated properly after the mold is fired;

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 level adjustment of the mold is not enough. It is easy to cause ignition and damage to the mold;

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

6. Impurities or metal substances are mixed in the workpiece medium for high-frequency processing;

7. The quality of the capacitor is not good. The mold has burrs or the edges are too sharp. It may also be that the capacitor material is too thin to cause 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 twice the normal operating voltage, causing dielectric breakdown.

2. How to deal with sparking during the use of high frequency

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

2. Every time a new mold is debugged, the current should be adjusted to 0.2A. Then use the co-tuner to slowly adjust the current to a suitable current heat seal;

3. If the high-frequency mold is on fire, you must use a clean rag, and add alcohol, gasoline, toluene, etc. to deal with the corresponding dust;

4. A certain insulating material must be used under the high frequency mold. Soldering products required to effectively prevent high-frequency re-breakdown;

5. The sparking phenomena that occur during the production process of the oscillating barrel mainly include flashovers such as capacitor chips and high-voltage tube sockets. The processing method is the same as that of the capacitor adjustment sheet;

6. The capacitor should not be adjusted too violently during the adjustment process, and the corresponding range should be adjusted slowly. If the edge of the capacitor is sparked during the production process, it may be that the edge of the capacitor is not cleaned and the aluminum plate is burred. Needs to be sanded smooth.

3. How to prevent high frequency ignition

1. In the production process of high frequency, the vibration 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, which is mainly related to the material. The material of the material is not easy to cause ignition. ;

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