![]() We’ll review what they are, where they come from, and how they influence the buildup of the stencil during the coating process.įirst, let’s review what a photoemulsion is. In this discussion, we’ll focus on the last category–photoemulsion variables–and look closely at solids content, viscosity, and rheology. mesh variables, such as thread count, thread diameter, size of mesh openings, screen tension, etc. coating variables, including type of coating trough, coating speed, pressure, etc.Ģ. Creating a stencil to achieve specific printing characteristics requires the correct combination of many factors, which can be divided into three broad categories:ġ. Of course, stencil thickness isn’t just a result of emulsion properties. Solids, viscosity, and rheology are the three physical properties of a photoemulsion that affect the final stencil thickness we can achieve. But ask even an experienced printer to define another key emulsion variable– rheology–and their facial expression quickly turns to one of confusion. Most printers seem to have a grasp on the terms solids and viscosity, or at least they understand that these are important characteristics of liquid photoemulsions. But do you know the chemistry and physics behind the resulting stencil thickness? Did you know that some emulsions are more readily adaptable to different mesh counts? And, did you know that solids content and viscosity aren’t the only factors that influence the stencil thickness you can achieve? ![]() Sure, you know how to coat mesh with a liquid photoemulsion. Join the Screen Printing Brain Squad - and Make Your Voice Heard!.Get Your Free Subscription to Screen Printing magazine.
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