We all know, basically, what rust is and what causes it. What many don’t know, however, is that rust is unique in its properties. Knowing how to deal with and/or prevent rust is very important in many cleaning applications. The above picture is actually worthy of hanging on a wall as art. In fact, I …
Most cleaning today is based on aqueous (water based) technology. Wash, rinse and dry cleaning has become the norm. But, for those of you who are new to the cleaning industry and don’t know, Chlorinated and Fluorinated solvents were the cleaning “benchmark” for many years. Virtually every manufacturing facility cleaned something using a vapor degreaser with …
A previous blog revealed that ultrasonic frequency has an effect on the removal of soluble contaminants. In general, lower frequency will be more effective in the removal of soluble contaminants. Today’s blog will discuss the effect of frequency on the removal of insoluble contaminants – ie. particles. As ultrasonic frequency is increased, two things happen. First, the …
Earlier blogs have explained the effect of frequency on the size of cavitation bubbles and where they are formed. Today’s will explain the effect of bubble size and location on removing soluble contaminants. Soluble Contaminants – The removal of soluble contaminants requires that solvent saturated with the contaminant being removed must be displaced from the solvent/contaminant …
In a previous post, Ultrasonic Cleaning – Soluble Contaminants, I discussed the effect that ultrasonic cavitation and implosion play in enhancing the removal of soluble contaminants from surfaces. Today’s blog will introduce the effect that ultrasonic cavitation and implosion have on the removal of insoluble particles from surfaces. There are several mechanisms that can cause …
In the blog entitled Get a Move On, I briefly discussed the importance of some form of mechanical action to assist cleaning. This is true in both the case of soluble and insoluble contaminants. In this blog I will dig a little deeper into the subject of the benefits of mechanical action in removing soluble …
A reader has asked for a description of how “near field” ultrasonics works. First of all, the term “near field” is one that is not well defined in the ultrasonic cleaning world. For the purpose of this discussion regarding ultrasonic cleaning, “near field” means putting the ultrasonic source close to the work piece. It may …
In the blog “Reader Questions – Monitoring Ultrasonic Transducers,” I suggested a couple of ways one might test individual ultrasonic transducers to assure they have not become ineffective due to de-bonding from the cleaning tank. In an extension of the spirit of that blog, quality control measures for ultrasonic cleaning performance, I decided to check out a paper I …
A previous blog Cleaning – Soluble Contaminants – “Solvents” described soluble contaminants as those contaminants that can be dissolved using a solvent or engineered liquid such as a surfactant. Contaminants that are not soluble are the other distinct classification of contaminants. Sometimes the line between soluble and insoluble is not well defined since there are …
Today’s blog is responding to two questions asked by readers. Both concern monitoring of ultrasonic transducer performance. Ralph Clendenin asks – “Is there a measurement of the frequency I need to be aware of during “good” operation I can check monthly that would show reduction in cleaning due to change in frequency?” Stephen Sharkey asks – …
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