The working principle of ultrasonic sealing

Welding tools (base or welding head) concentrate ultrasonic energy on the location to be welded and generate frictional heat. The sealing time is between 100 and 200 milliseconds. Unlike heat sealing, the heat required for ultrasonic technology is only generated within the material to be welded. These tools keep the temperature low and help dissipate heat. The hot seam strength (the strength of the weld seam that has not been cooled after welding) is significantly higher than other welding methods. In order to achieve precise welding, the energy of ultrasonic waves must be concentrated (energy focusing). This works through the geometric shape of the tool or the design of the weld seam on the material. In weld design, the area of the material to be joined has a special shape, such as a point or edge. In the geometric shape of the tool, the welding head or base is specially designed to concentrate energy.

Welding is becoming increasingly important in the packaging industry. Flexible (such as film) or shape stable (such as beverage paper boxes) packaging can be connected in this way. Ultrasonic sealing is a special welding method. Heat is only generated within the material to be welded. Therefore, the items in the packaging only receive minimal heat. The base can also concentrate energy, ensuring narrow and tight seams. This saves energy and packaging materials, making it more environmentally friendly than other sealing methods. Ultrasonic sealing is an ideal choice for packaging solutions in the food industry. Exquisite appearance, long shelf life, and 100% sealing - these are the standards for manufacturers and consumers. Therefore, this type of seal is particularly suitable for:

▲ Use thermoplastic film for bags, such as salads on refrigerated shelves or bagged ready to eat food

▲ Pipes, covers, and cups, such as the top cover at the end of a yogurt jar or toothpaste tube

▲Thermoplastic coated cardboard boxes, such as beverage paper boxes

▲ Gas valves on film/filter materials, such as degassing valves for coffee bean packaging

▲ Spiral lids on coated cardboard boxes/films, such as packaging milk