How to choose an ultrasonic mold

With the widespread use of ultrasonic plastic welding machines in industry, the importance of 

ultrasonic plastic welding machines is gradually becoming evident. The current industrial production

 is closely linked to ultrasonic plastic welding technology. Since the utility of ultrasonic welding 

equipment is so common, today we will share how to choose ultrasonic molds.

• Compatibility of Welding Materials:

  Some different materials cannot be welded together. In theory, it is possible to weld similar materials.

   However, there are limitations. Ultrasonic welding is not suitable for materials with a melting point 

  higher than 350 degrees Celsius. Ultrasonic welding uses instant energy to bond molecules, and the 

  welding time should not exceed 3 seconds. If welding fails within 3 seconds, it is not suitable. 

  Therefore, attention should be paid when selecting welding materials.

• Heat Resistance of Welded Parts:

  Ultrasonic waves travel through solid materials when passing through the parts, but they travel through 

  the air between two parts. The acoustic impedance of ultrasonic waves transmitted through the air is

   higher than that in solids. The higher the acoustic impedance, the more heat is generated. Therefore,

   the temperature at the contact area between the two parts is higher and reaches the melting point

   first when ultrasonic welding is applied. When the ultrasonic waves travel internally, the acoustic

   impedance is lower, and the temperature is relatively lower, so it does not reach the melting point.

• Consideration of Contact Area and Distance:

  The welding contact area between the two parts must meet the welding requirements, not too large 

  or too small. Too much contact can lead to loose welding energy and inadequate strength, and it may

   not be possible to weld properly. If the contact point is too small, the welding may not be strong and 

  could easily break. The distance between the parts affects energy loss, so it is essential to control the

   welding distance.

• Importance of Ultrasonic Molds:

  The production of ultrasonic welding head molds should go through a strict process. This is not 

  something that can be done in an ordinary small workshop. Therefore, avoid purchasing ultrasonic 

  molds from small manufacturers, as this can hinder you from achieving excellent welding results.

• Maintain Stable Machine Output Power:

  When operating an ultrasonic plastic welding machine, it is essential to ensure that its output power 

  is stable and not too high or too low, as this can affect the welding quality.