Welding can be said to be one of the most important technologies in modern society. In our daily life, from planes, high-speed trains, ships, cars and other means of transportation, to toys, home appliances, food packaging and other common daily necessities, Lingke ultrasonic welding is present. It can be said that Lingke ultrasonic welding technology plays an indispensable role in the manufacturing industry.

Lingke Ultrasonic will use different welding methods when facing products of different materials. In the field of plastic welding, there are 6 common welding methods. They are ultrasonic welding, hot plate welding, rotation welding, high frequency welding, and hot melt welding. As well as plastic sealing machines, today we will take a look at the welding principles and applicable fields of three of them!

Ultrasonic welding
The principle of ultrasonic plastic welding is to generate high-voltage and high-frequency sine wave signals from a signal generator, convert them into high-frequency mechanical vibration energy through a transducer, and then couple the amplified vibrations to the plastic parts to be welded through the horn and welding horn. On the other hand, the high-frequency friction under high pressure causes the plastic contact surface to instantly melt at high temperature. After the ultrasonic wave stops, the two plastic parts are welded together after a short period of pressure and cooling. The welding process generally does not exceed one second, and the welding strength can be as high as Comparable to the body.

Applicable: nylon, polyester, polypropylene, some polyethylene, modified acrylic resin, etc. Widely used in various industries such as electronic appliances, auto parts, plastic toys, cosmetics, etc.

Hot plate welding
The metal hot plate directly heats the welding surface of the plastic parts until a certain melting point is reached. The hot plate exits, and then applies a certain pressure to the two plastic parts together and cools them to achieve the purpose of welding.

Suitable for: Welding of thermoplastic plastic workpieces such as PE, PP, nylon, ABS, acrylic, etc., such as automobile combination lights, carburetors, water tanks, washing machine balance rings, bumpers, vacuum cleaners and other ultrasonic refractory plastic parts and large-sized special-shaped workpieces.

thermoplastic welding machine

Rotary welding
During welding, one plastic workpiece is fixed and the other plastic workpiece is driven by the motor to rotate at high speed, causing the contact surfaces of the two plastic workpieces to rub against each other and generate high-temperature melting. After the rotation stops, external pressure is used to drive the up and down parts. The workpieces solidify into one, becoming a permanent bond.

Applicable to: PE, PP, nylon, PET and other round tubes, industrial filter elements, medical filter elements, plastic cups, toy balls, dewatering joints, automobile and motorcycle oil filter cups, shower heads, thermos bottle bladders and other rotating workpieces.