Ultrasonic Power vs. Cavitation Density

The notion persists that more power is better in ultrasonic cleaning applications.  In the past, this may have been an absolute as the amount of power available was often limited by the limitations of the equipment that was available.  As we discussed in a recent blog however, today’s ultrasonic equipment is no longer limited in power …

Lab Testing – Chemical Life

A previous blog discussed the ramifications of contaminant loading on cleaning.  This time let’s look at the long term effects on cleaning chemistry.  In lab testing, the ability of chemistry to withstand extended use is often not challenged.  Chemistry is prepared and used for short term cleaning trials to verify the cleaning process.  In long …

Lab Testing – Contaminant Loading

The risk of laboratory testing was discussed in the blog Beyond the Cleaning Lab Test Results.  This blog along with others that follow will explore these implications in more detail. In developing a cleaning process in the test lab, a technician usually starts out by cleaning a small number of parts using freshly prepared and uncontaminated …

Cleaning Process Specification Questions

The cleaning process is the “recipe” for cleaning.  Like any culinary recipe, it should clearly define the ingredients, times, temperatures and the method of application to be used for cleaning.  Most cleaning consists of at least the three basic steps of washing, rinsing and drying. Wash – The purpose of washing is to remove contaminants …

Immersion or Spray – – or Both?

Immersion or spray methods are used in most industrial cleaning processes.  Both are effective but one may be better suited than the other in some applications and often for reasons that aren’t immediately obvious.   Let’s take a minute to explore some of the benefits and limitations of each. Spray – The most often recognized …

Beyond the Cleaning Lab Test Results

Process testing in a cleaning laboratory is a typical and useful step in the development of an industrial cleaning process.  In most cases, test cleaning is performed in laboratories maintained by the suppliers of cleaning equipment and/or cleaning chemistries.  The goal of lab testing, of course, is to simulate a cleaning process to determine its effectiveness …

Maximizing Ultrasonic Energy Transfer

In ultrasonic cleaners, sound waves (vibration) originating from ultrasonic transducers must be efficiently transmitted into the cleaning liquid where they create cavitation bubbles which implode to enhance cleaning.  The weak links in the path from the transducer to the cavitating liquid are typically the  locations or “interfaces” where vibrations must be transmitted from one vibrating …

Millipore Testing – Verification

Millipore testing is a very popular method of measuring and verifying part cleanliness.  The procedure is described in the blog Millipore Testing.  Although the procedures for Millipore testing are usually very well written and precise, there is still occasionally reason to question the results.  So how do you make sure that the numbers are good? Since …

Ultrasonic Power – Reaching the Limits?

Ultrasonic power has been a topic of much discussion ever since ultrasonic technology was first used for cleaning nearly a century ago. The quest has always been for more ultrasonic power, the thought being that higher power would produce better cleaning results.  As I have discussed earlier, higher ultrasonic power typically requires an increase in the amplitude …