Other than to say that there is no perfect, infallible way, the blog has not addressed assessing ultrasonic performance. In an earlier blog, I did suggest that any of many methods are appropriate to compare ultrasonic performance of an ultrasonic system from day to day but that no further inference should be made. One test that’s …
Over the years, there have been several anecdotal references to otherwise unexplained changes in the properties of surfaces exposed to ultrasonic energy in a liquid. In some cases, it would make sense that the change was due to increased cleanliness. In others, however, the benefit of cleanliness alone would seem questionable. One incident in particular …
Watts per gallon as a measure of ultrasonic cleaning tank capability is under growing scrutiny. In a series of blogs over the next several weeks, I hope to explore the origin of watts per gallon and the changes and ambiguities which have brought its continued use as a measure of ultrasonic capability into question. Also, if …
When a sound wave encounters an object or discontinuity in the sound conducting medium, at least part of the sound is reflected. The way the sound reflects depends in large part on the rigidity of the reflecting surface. If the object is hard, like a substantial piece of metal, the wave reflects as shown below. …
I’ve made reference in the blog before to the fact that some surfaces are good candidates for ultrasonic cleaning while others are either difficult or impossible to clean. In general, surfaces that are hard (metal, glass) are easily cleaned using ultrasonics while softer surfaces (rubber, soft plastic) resist ultrasonic cleaning. The reason has to do …
Note – The following blog is adapted from a paper recently written by Timothy Piazza, President of Blackstone-NEY ultrasonics and is re-printed here with his permission. This would probably be a good time to mention that guest blogs or suggestions for blog topics are always welcome. My email is jfuchs@ctgclean.com. FJF Blackstone~NEY Ultrasonics – Sweep …
A few more things to monitor – Dirty rinse – An effective rinse is critical to most cleaning processes. Only in very limited cases can residues from the cleaning step be left on parts after they are cleaned. It does not, of course, do any good to clean the parts if they become re-contaminated by a …
Here are a few more variables that can be monitored in cleaning systems in pursuit of a Six Sigma process – Oil laden detergent – A good oil removal system is paramount in controlling the quality of the detergent in a cleaning system. An oily bath can quickly become ineffective in removing additional oil and even …
As discussed earlier, monitoring variables in a process is a critical part of Six Sigma. The following are some examples of parameters that can be monitored in a cleaning process and some suggestions regarding how the monitoring can be done. Chemical Concentration – Chemistry (detergent, acid, rinse aid, etc.) is one of the most important components of the …
In The BIG Four, I talked about the four important variables in cleaning. These are time, temperature, chemistry and agitation. In that blog, I mentioned that a shortcoming in one variable can, to a point, be overcome by changing another of the variables. For example, increasing temperature or changing chemistry may reduce the time required …
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