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 …

Questioning Particle Generation Due to Cavitation Erosion as a Source of Contamination

Ultrasonic cleaning is widely used for removing particles from surfaces.  It is generally agreed that the high energy of implosions of cavitation bubbles break the bonds holding particles to the surface being cleaned and that liquid motion (streaming) carries the particles away once they have been dislodged.  However, it is also well known that ultrasonic cavitation …

Heat – Definitions and Concepts

Temperature has been identified as one of the important variables in cleaning – arguably the most important.  So I thought it might be worth some time to develop a little understanding of heat – – especially how it is generated and transmitted. Heat is a form of energy.  The amount of heat contained in an object …