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In the field of electronic devices, '''Roll-to-roll processing''', also known as '''web processing''', '''reel-to-reel processing''' or '''R2R''', is the process of creating electronic devices on a roll of [[flexible plastic]] or metal [[Foil (chemistry)|foil]]. In other fields predating this use, it can refer to any process of applying coatings, [[Roll-to-roll printing|printing]], or performing other processes starting with a roll of a flexible material and re-reeling after the process to create an output roll. These processes, and others such as sheeting, can be grouped together under the general term '''[[converting]]'''. When the rolls of material have been coated, laminated or printed they can be subsequently slit to their finished size on a [[slitter]] rewinder.
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Large [[Integrated circuit|circuit]]s made with [[thin-film transistor]]s and other devices can be [[pattern]]ed onto these large substrates, which can be up to a few metres wide and 50 km long.{{cn|date=March 2017}} Some of the devices can be patterned directly, much like an [[inkjet printer]] deposits ink. For most [[semiconductor]]s, however, the devices must be patterned using [[photolithography]] techniques.
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