How do Ultrasonic sealers weld materials ?

The ultrasonic point sealer weld materials in a few seconds.

Mechanism of Welding

Ultrasonic vibrations are emitted from the upper horn (metal part) the handpiece is pressed.
The frictional heat caused by the ultrasonic vibration instantly melts the pinched material.
As the ultrasonic vibration stops, the material becomes solid and sticks together in a second.

By this mechanism, ultrasonic sealers can weld materials that can be melted by frictional heat.
(Example: chemical fabrics, plastic packages, non-woven fabrics, etc.)

Conversely, materials that do not melt by frictional heat cannot seal.
(Example: Papers, wood, etc.)

-Fabrics
Non-weldable: Cotton, rayon, wool, other natural fabrics, etc.
Weldable: Polyester, nylon, acrylics, other chemical fabrics, etc.

-Packaging materials
Non-weldable: Paper, bamboo, other natural materials, etc.
Weldable: Plastics (PP, PET, OPS, etc.), non-woven fabrics, etc.

■Video -How to use Ultrasonic point sealer QP-01

■Product details
Ultrasonic sealer
https://asahi-packaging.com/genre/ultrasonic-welder/