It should be clear by now that heat plays an important role in drying. Delivery of heat to a drying system is critical and can be accomplished in a number of ways. Today’s blog will explore two options for heat delivery – conduction and radiation. Conduction seems to be the “go to” when it comes …
If you have deduced from the preceeding few blogs that heat is one of the major factors in drying, you are right. But before we talk more about heat, let’s “set the stage.” Heat is that stuff that increases temperature of a substance when added and reduces temperature when absorbed. Temperature is the level of …
In reading the last couple of blogs it would be easy for the reader to come to the conclusion that the addition of heat is all that is needed to dry things. It would be nice and easy if that was the only consideration. The fact is that evaporative cooling is working against us in …
In the preceding blog, we learned that relative humidity of air is affected by temperature. Although I really didn’t say it, I’m sure readers have come to the conclusion that lower relative humidity will result in air which is “hungry” for water. Air that is at a low relative humidity, then, is beneficial to drying. …
I first talked about drying a long time ago in the blog called “Don’t Forget Drying.” In that blog, I stressed the importance of drying as a part of the cleaning process. In some cases, changes in the cleaning process can affect drying but, for now, let’s just concentrate on drying. Drying simply means removing liquid …
Preceding blogs have discussed acidic and caustic based cleaning chemistry. There are also chemistries, however, which are neither acidic or caustic but, rather, rely on other more mechanical than chemical mechanisms to affect cleaning. In a capsule, these mechanisms are wetting and emulsification. The reader should recognize that ingredients that promote these removal mechanisms are frequently …
Acidic cleaning chemistries were discussed in a preceding blog. Now let’s talk about the second of the three classifications of chemistry we defined – caustics. Caustics are materials that are basic as opposed to acidic in nature. The use of caustics for cleaning, especially for removing oils and greases, can be traced to the ancients. …
Water is often referred to as the “universal solvent.” Yet, as we all know, its hard to get grime off of your hands clean without using some soap! Water, however, is an attractive “solvent” as it is plentiful, relatively cheap and safe. The problem is that water just isn’t good at getting things clean all by …
Dimensions of orifices and typical contaminant scenarios were discussed in preceding blogs. Today, let’s consider the role of ultrasonics in removing contaminants from orifices. First, we’ll consider the “classic” orifice consisting of a passageway through a solid. Then we’ll talk about some special cases which can have an impact on the ability of ultrasonics and …
The preceding post defined two dimensions of concern when considering cleaning orifices. Before moving on, let’s now consider how the various types of contamination that might be found in an orifice and how each affects the cleaning task. Liquids – Liquids are common contaminants in orifices. Liquid contamination can result from manufacturing operations but also …
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