- Protection against secondary frequencies
- The need for soundproofing when ultrasonic frequencies are in the non-audible range
- “Not hearing, just seeing”
As early as 1973, Herrmann Ultraschall introduced the first series-produced soundproof system for ultrasonic welding. The legendary Ultra Safe was regarded as an absolute novelty in the industry and changed the way ultrasonic welding was performed. At Fakuma 2015 the company will launch a modern remake of this successful product.
Working area is protected by safety light curtain
In addition to the classic soundproof booth, an open safety cell will be launched which provides special protection against access by third parties. The working area is protected by a safety light curtain, which can be configured as automatic start, making manual start triggering redundant. Both Ultra Safe versions can be easily placed on a workbench and supplemented with the company’s accessories. And they can be combined with all ultrasonic welding machines of the HiQ product range.
Why is there a need for soundproofing when ultrasonic frequencies of 20 kHz or 35 kHz are in the non-audible range?
This is a very common question. The to be welded plastic parts, such as the two halves of an electric toothbrush or a filter housing with cover, act as a resonating body. During the welding process, the only few millisecond lasting ultrasonic vibration is damped by the plastic component and excited to a resonance in the low frequency range. The resulting structure-borne sound of the plastic component is partially in the audible range. Human beings usually perceive this as a short, unpleasant whistling sound.
This source of noise should not be underestimated in the long run. As a solution for a secure production environment Herrmann Ultraschall has constantly developed soundproof cabins in different variants. Meanwhile, certain acoustic insulation materials have significantly improved over time and behind the double glazed safety door further functional integration can be implemented in order to protect operators from unintentional engagement.