A horn vibrating typically at 20 or 35 kHz presses the web against an anvil roll with raised points, and frictional heating fuses thermoplastic fibers only at those points. No heated rolls or adhesive are needed, so it suits laminating layers, sealing edges and embossing designs in hygiene and medical products. Bond quality depends on amplitude, pressure, speed and the anvil pattern.
Ultrasonic bonding on the side seam is weak at full speed, so bump the amplitude or add a horn.
Also heard as
- ultrasonic welding
- ultrasonic lamination
- sonic bonding
Related terms
Thermal bonding
Bonding a web by heating it so thermoplastic fibers or binder fibers soften and fuse at their crossing points.
Lamination
Joining a nonwoven to film, another nonwoven or other material to make one multilayer product.
Embossing
Pressing a raised or recessed pattern into a nonwoven with engraved, usually heated, rolls.