Sound Physics – Nodes and Antinodes – Part I

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 …

Ultrasonics – The What and Why of Sweeping Frequency

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 …

Six Sigma – Monitoring Variables in Cleaning – Part 3 (final)

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 …

Six Sigma – Monitoring Variables in Cleaning – Part 2

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 …

Six Sigma – Monitoring Variables in Cleaning – Part 1

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 …

Ultrasonic Cleaning Time – Enough is Enough

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 …

Ultrasonics – Surface Cavitation Erosion

Surface cavitation erosion of ultrasonic transducers is a topic that users and manufacturers of ultrasonic equipment would often rather not talk about – – but we must.  The erosion of a transducer surface due to surface cavitation is inevitable over time.  Its severity depends on several factors, some of which can be controlled and some …