Application, principle, welding conditions and applicable industries of ultrasonic plastic welding machine

Ultrasonic plastic welding machine application:

Ultrasonic plastic welding machine is used for welding, riveting, forming, implantation and welding of metal and plastic products. It is widely used in welding products in various industries such as electronics, electrical appliances, auto parts, plastic toys, stationery, daily necessities, handicrafts, cosmetics, mobile phones, computers, power boxes, chargers, adapters and other industries.

Principle of ultrasonic plastic welding machine:

The ultrasonic welding machine is a high-voltage and high-frequency signal of 20KHz (or 15KHz) generated by the generator. Through the transducer system, the signal is converted into high-frequency mechanical vibration, which is applied to the workpiece of plastic products, through the friction between the surface of the workpiece and the molecules. The temperature transmitted to the interface increases. When the temperature reaches the melting point of the workpiece itself, the interface of the workpiece melts rapidly, and then fills the gap between the interfaces. When the vibration stops, the workpiece is cooled and shaped under a certain pressure at the same time. Perfect welding shape.

The new 15KHz ultrasonic plastic welding machine has a unique effect on welding hard ABS and PC and softer PE and PP materials, as well as plastic weldments with large diameter and long length, which can meet the needs of various products. Customer production requirements, efficiency and product grades produce different types of ultrasonic welding machines and ultrasonic welding heads, fixtures, molds, hot stamping molds, etc.

Conditions for ultrasonic welding of plastic products:

The most important conditions for ultrasonic welding are the duration and pressure of applying welding energy (vibration, welding time). Of course, other conditions are also important. Welding temperature The viscous flow temperature of the ultrasonic welding material. Otherwise the material will not melt. It is related to the amplitude, the higher the amplitude, the higher the temperature rise. Pressurizing force Pressurizing the molded product with a cylindrical eye. Generally, the compressed air pressure is 0.1-0.3MPa (pressure gauge), sometimes higher. However, if high pressure is used, the vibration of the cylinder will be hindered. The welding time varies depending on the type of material and the shape of the product, but only 0.2 seconds is sufficient for the welding time of some molded products. If the time is too long, it will cause excessive welding and produce a lot of flash and air bubbles, which will lead to poor air tightness, which must be paid attention to. Cooling (holding) time For crystalline plastics, if the temperature is below the melting point, the connection part will be solidified, usually the pressing time is kept between 0.1-0.2 seconds.