Coating Process Technology
Transverse-direction discrete stripes: The slot die can coat discrete transverse-direction stripes by controlled motion of the die without deckles while coating.
Laboratory discrete-area coating: Discrete coatings of sheets can be prepared in the laboratory by coating and drying the entire sheet and cutting out the desired shape. Another method is to prepare a template with the desired shapes cut out and apply it to the surface of an uncoated sheet. The entire structure can then be spray-coated with solution into the open areas to give the desired discrete area.
In addition, there are laboratory patch coaters that can coat multiple polygon patches onto a substrate sheet with the required size-tolerance and coating quality. Such typical coaters consist of a vertical-die and solution-feed system which contacts the substrate and applies coating solutions in the required discrete area. The flow is turned off, and the die moves to another uncoated area to apply another polygon-patch coating. This process continues until the required number of samples are obtained. The advantages of this process are low cost; precise, reproducible, commercial-quality coated patches, and the ability to run designed experiments.