Meet the three requirements of ultrasonic plastic welding
Ultrasonic plastic welding is widely used in all walks of life. How can people use ultrasonic plastic welding to achieve good results? The following three conditions need to be met.
First of all, the principle of ultrasonic plastic welding is: a generator generates a 20KHZ high-voltage, high-frequency signal, and the signal is converted into a high-frequency mechanical vibration through the energy conversion system, which acts on the plastic workpiece, through the working surface and the internal intermolecular Friction increases the temperature of the contact surface. When the temperature reaches the melting point of the workpiece itself, the contact surface of the workpiece melts quickly, and after a certain pressure is applied, it merges into a whole. After the ultrasonic is finished, the workpiece is continuously cooled and formed under a certain pressure to achieve a very ideal welding.
The product needs conditions to achieve the ideal welding effect. The next step is to meet the three conditions of ultrasonic plastic welding:
1. Plastic parts must have a reasonable ultrasonic welding surface: when the instantaneous energy is generated, the larger the welding area, the more serious the energy dispersion, the worse the welding effect, and the worse it can even be welded. In addition, the ultrasonic wave propagates longitudinally, and the energy loss is proportional to the distance. If the welding distance is too long, it cannot be welded well, especially for products that require airtightness.
2. The product positioning structure must be designed reasonably: before product development and design, we must consider the appearance of the finished product, whether the joint position of the two synthetic plastic parts is misaligned or not, and there are also pneumatic or manual fixtures to fix the product to avoid misalignment .
3. Whether two plastic materials can be welded: some of different materials can be welded better, some are basically fused, and some are not fused. The melting point of the same material is the same, and it can be welded in principle.