What is “ultrasound”?
The audible frequency of mechanical waves, between 16Hz and 16.000 Hz. Frequencies not audible to the human ear below 16 Hz are called “infrasound”, those higher than 16,000 Hz, ULTRASOUND.
What is the operating principle of ultrasound welding?
From a physical point of view, ultrasound welding is a physical phenomenon and consists of repeated alternating motion around a central position or equilibrium point. It involves the thermoplastic parts, in most cases obtained by injection moulding, and creates within them progressive intermolecular friction that results in a localized temperature increase. This increase, concentrated in an extremely short time interval (tenths of a second), causes the melting of a well-defined area (the weld area) which, under the action of a constant thrust force, causes two parts to unite, penetrating one in the other. The pieces, therefore, are welded together without the need for glue or additives.