Although the importance of “degassing” liquids prior to their use in an ultrasonic cleaning or rinsing process is pretty much common knowledge, the source of the gas and details of how to remove it are less well known. This blog is the beginning of a series which will describe in some detail where that gas comes …
Previous blogs discussed the demise of solvents after the Montreal Protocol. Today, in the US at least, solvents are coming back prompting the reader to ask, “What Has Changed.” First of all, there was never any real argument that solvents did, and still do, a good job of cleaning in many, many applications! Are there aqueous and other alternatives …
Providing the best and most efficient rinse in an aqueous cleaning process requires maintaining the cleanest possible water in the rinse. In spray rinses, this can be accomplished by using fresh water for the spray. A spray rinse with fresh water, although effective, is often not practical. Using a constant supply of fresh water is costly, especially if …
From time to time here on the blog I will try to include some applications notes targeting specific cleaning applications and giving you a taste of the successes and challenges faced in each. Although you may not have a need for the specific information presented, you may, as cleaning technologists, find it interesting what other …
Rust is a potential problem whenever ferrous parts are being cleaned. There are several options available to prevent or eliminate rusting both during and after the parts cleaning process. Steel will rust if it is exposed to oxygen and moisture as discussed in the blog Some Things You Should Know About Rust. Although iron oxide (rust) gets …
Many ultrasonic generators are configured to operate at one power level – full on. There are occasions, however, when controlling the ultrasonic power is critical to a successful ultrasonic cleaning process. This is especially true when cleaning parts made of relatively soft materials including brass, copper and, in some cases, even aluminum. Other cases requiring …
Rinsing as it applies to aqueous parts cleaning is a final “cleaning” step which removes residues introduced by or resulting from the primary cleaning process. There are several options to choose from when it comes to rinsing. Making the proper selection is very important to the overall cleaning process as the final rinse inevitably defines overall cleanliness. …
In the period immediately following the signing of the Montreal Protocol, virtually every manufacturing facility using solvents for cleaning was faced a critical decision. The three basic options were – Discontinue unnecessary cleaning operations altogether. Upgrade or replace existing solvent-based cleaning systems to reduce solvent emissions. Switch to cleaning using water-based chemistry. Surprisingly, the first option, eliminating …
A dedicated reader has requested that the blog address rinsing in more detail. Rinsing ranks high on the list of process steps that are often not given their due attention in the specification of an overall cleaning process. Many specifications just say “rinse” and nothing more. In fact, rinsing is a secondary cleaning step intended to remove residuals left …
In the blogs about transducers I made a point of telling readers that an ultrasonic transducer must be driven at its resonant frequency to achieve optimum performance. What I didn’t address, however, was the fact that the resonant characteristics of a transducer can be varied by its design. Not only the resonant frequency but the “sharpness” or “Q” …
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