Let me preface this blog with a disclaimer – – I am not a chemist. My understanding of the subject of pH is only as it relates to industial cleaning, cleaning chemistries and their application. Over the years, I have been associated with many chemists who have been very helpful in their efforts to advance …
Buffing compound is a material used in polishing operations which must be removed once polishing is complete. Buffing compound consists of a finely divided abrasive mixed with a “vehicle” which is often a paraffin or, in some cases, animal fat and other “fats” depending on their price and availability in a particular region of the world. The “vehicle” …
By law, there must be a Material Safety Data Sheet for any material used in any process. The law was instituted, basically, because workers were unknowingly coming in contact with materials that were dangerous not only from a physical standpoint (fire, reactivity, explosivity, etc.) but to human health and well-being as well. Many of today’s …
Using a vacuum to assist or effect total drying is not a new concept. A reduction of air pressure lowers the boiling point of water and other liquids and thereby speeds their rate of evaporation. Although not practical in many applications for reasons I will discuss below, vacuum drying remains a viable alternative in some specialized applications. …
Hot air drying applications involve, primarily, the evaporation of water or another liquid such as a solvent from the surface being dried. Evaporation occurs as heated air circulates over and around the surface being dried as discussed in earlier blogs. In all cases this liquid evaporation consumes heat which results in cooling of the remaining liquid. One …
One of the more recent developments in minimizing the water left on a part after rinsing is “slow-pull.” Slow-pull is usually applied as the parts exit the rinse that immediately precedes drying. Instead of removing the parts from the rinse at a rapid rate, usually measured in feet per minute (or even feet per second), they are …
The surface tension of a liquid, as we have discussed earlier, is an important consideration in the selection of cleaning chemistry for a particular application but it also has relevance in several other ways as well. In earlier blogs, I have frequently referred to the importance of surface tension but haven’t really discussed what surface tension …
For all I have said about drying in the preceding blogs, maybe I should have started with this one. So here we go, better late than never. Although a seemingly “no brainer,” the idea of reducing the load on the dryer by eliminating as much water as possible prior to the drying process itself remains …
High velocity compressed air blow-offs are a viable means of drying or de-watering parts in many applications. They are especially useful if parts don’t need to be “super dry” (as completely free of water) or if there is a requirement to remove “excess” water from a part prior to final drying using another means such as hot …
In the previous blog, I promised that we would further explore Conductive vs. Radiant heating as a way to dry parts in this blog. I can think of no better way than by using a couple of illustrations showing the flow of heat in both cases. Hot Air Drying – Conductive In a hot air …
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