Ultrasonic welded seam
Also known as: Ultrasonic seam, US welded seam
Thread-free join in which thermoplastic fibres are welded by high-frequency vibration – used for PPE and disposable textiles.
Description
In the ultrasonic seam, two layers of thermoplastic material (polyester, polyamide, polypropylene, PE) are welded between a sonotrode (20–40 kHz vibration) and a profiled anvil roller. The frictional heat locally melts the fibres, creating a point- or line-shaped joint – with no thread at all.
Used for surgical gowns and masks, disposable protective coveralls, nonwoven shopping bags, backpack tape edges and internal reinforcements of sports shoes. Advantages: no needle holes, no thread, very fast throughput (up to 30 m/min). Drawbacks: only works on thermoplastic fibres (not pure cotton) and the seam is strong but not stretchable.
Properties
| Process | 20–40 kHz sonotrode |
|---|---|
| Material | thermoplastic fibres only |
| Usage | surgical gowns, PP bags, PPE |
| Speed | up to 30 m/min |
Related product categories
Sources & references
1- Wikipedia: Ultraschallschweissen Wikipedia — Freie Enzyklopädie https://de.wikipedia.org/wiki/Ultraschallschwei%C3%9Fen
