In some cases, the process is performed in a clean room to prevent the adhesion of foreign particles on the wet surface before solidification. These systems are mainly used for wet coating. However, wide and long substrates (targets) can also be coated continuously and quickly. In general, use is limited to the coating of relatively thin flat targets such as films and sheets. As a result, roll coaters have been adopted in various industrial fields, including electronic components, optical and LCD products, food, and medicine. Coating systems that use rollers are able to support various coating fluid viscosities and different coating thicknesses through the combination and specialization of many different technologies. Roll coater systems are used for coating flat targets (substrates) through a combination of multiple different rollers to obtain the desired coated surface.
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