Today we're going to look at one of the welding techniques used in the production of masks: ultrasonic welding. which is the use of high-frequency vibration waves to the surface of two objects to be welded, Under pressure, the surface of two objects rubs against each other to form a molecule layer fusion. Masks can be seen everywhere, such as sealing edges, earsstraps, exhalation valves are ultrasonic welding.
In the production process of masks, we understand the full plastic nose strip welding, folding welding, breathing valve welding, multi-layer rolling welding, earband welding, these are actually through ultrasonic welding process to complete.
Ultrasonic action on the thermoplastic contact surface, will produce tens of thousands of times per second of high-frequency vibration, this reaches a certain amplitude of high-frequency vibration, through the welding parts to the ultrasonic energy transmitted to the welding area, because the welding area is the intersection of two welding sound resistance, so will produce local high temperature.
Due to the poor thermal conductivity of the plastic, it can not be distributed in time for a while, and gathered in the welding area, resulting in the rapid melting of the contact surfaces of the two plastics, plus a certain amount of pressure, so that they are integrated.
When the ultrasonic wave stops acting, let the pressure continue for a few seconds, so that it solidifies, thus forming a strong molecular chain, to achieve the purpose of welding, welding strength can be close to the strength of the raw material.
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