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What should I do if the ultrasonic plastic welding

Ultrasonic plastic welding machines are very common in the operation of the product, such as scratches on the surface of the product, breakage or cracking of the joint.

Because there are two situations in an ultrasonic operation:

1. High thermal energy directly contacts the surface of plastic products

2. Vibration conduction.

Therefore, when the ultrasonic plastic welding machine acts on the plastic product, the surface of the product is prone to burns, and the plastic column or hole with a thin thickness of 1 m/m is also prone to cracking. This is a prerequisite for ultrasonic operation. unavoidable. On the other hand, due to the lack of ultrasonic output energy (extension table and HORN upper mold), it takes a long time to weld when the vibration friction energy is converted into thermal energy to accumulate thermal energy to compensate for the lack of output power. The constant wave ultrasonic welding method is not the vibration friction thermal energy that is achieved in an instant, but the welding time is required to accumulate the thermal energy, so that the melting point of the plastic product reaches the fusion effect, so that the thermal energy stays on the surface of the product for a long time. Accumulated temperatures and pressures can also cause burns, breaks or breaks in the product. Therefore, it is necessary to consider the power output (number of segments), welding time, dynamic pressure and other factors to overcome this type of job loss.


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Ultrasonic plastic welding machine produces crack solutions:

1. Reduce the pressure.

2. Reduce the delay time (early vibration).

3. Reduce the welding time.

4. Quote media coverage (eg PE bags).

5. The mold has a surface treatment (hardened or chrome plated).

6. The number of machine stages is reduced or reduced.

7. For products that are easily cracked or broken, the fixture should be made of cushioning, such as soft resin or covered cork (this means does not affect the welding strength).

8. Easy to break products add R angle at right angles.


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