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{{more citations needed|date=October 2010}}
[[File:R2R line.jpg|thumb|A typical industrial roll-to-roll process line.]]
In the field of electronic devices, '''roll-to-roll processing''', also known as '''web processing''',<ref name="web processing">{{cite web|title=Digital roll-to-roll web processing revolutionizes printed electronic production|url=https://www.controleng.com/single-article/digital-roll-to-roll-web-processing-revolutionizes-printed-electronic-production.html?print=1|website=Control Engineering|accessdate=February 1, 2018|date=March 12, 2013}}</ref> '''reel-to-reel processing''' or '''R2R''',<ref name=":0">{{Cite journal|last1=Goswami|first1=Debkalpa|last2=Munera|first2=Juan C.|last3=Pal|first3=Aniket|last4=Sadri|first4=Behnam|last5=Scarpetti|first5=Caio Lui P. G.|last6=Martinez|first6=Ramses V.|date=2018-05-18|title=Roll-to-Roll Nanoforming of Metals Using Laser-Induced Superplasticity|journal=Nano Letters|language=en|volume=18|issue=6|pages=3616–3622|doi=10.1021/acs.nanolett.8b00714|pmid=29775318|bibcode=2018NanoL..18.3616G|issn=1530-6984}}</ref> is the process of creating electronic devices on a roll of [[flexible plastic]], metal [[Foil (chemistry)|foil]], or flexible glass.<ref>{{cite journal |url=https://www.researchgate.net/publication/260251815 |via=[[ResearchGate]]|doi=10.1016/j.surfcoat.2013.10.056 |title=Roll-to-roll sputter deposition on flexible glass substrates |year=2014 |last1=Tamagaki |first1=Hiroshi |last2=Ikari |first2=Yoshimitu |last3=Ohba |first3=Naoki |journal=Surface and Coatings Technology |volume=241 |pages=138–141 }}</ref> In other fields predating this use, it can refer to any process of applying coating, [[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 '''[[Converter (industry)|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.
== In electronic devices ==
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 {{convert|50|km|abbr=on}} long.{{citation needed|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.
[[File:Roll tol rol slitting processing.jpg|alt=roll to roll processing|thumb|roll to roll processing]]
Roll-to-roll processing of large-area electronic devices reduces manufacturing cost.<ref>{{cite book|chapter-url=https://books.google.com/books?id=ZiGjrlkSpOQC&q=%22web+processing%22+%22Roll+to+roll%22&pg=PA19|title=Flexible Electronics: Materials and Applications|chapter=Fabrication on Web by Roll-to-Roll Processing|page=19|editor1=Wong, William S. |editor2=Salleo, Alberto|publisher=Springer|place=New York, NY|year=2009|isbn=978-0387743639}}</ref><ref name=":0" /> Most notable would be [[solar cell]]s, which are still prohibitively expensive for most markets due to the high cost per unit area of traditional bulk ([[Monocrystalline silicon|mono-]] or [[Polycrystalline silicon|polycrystalline]]) silicon manufacturing. Other applications could arise which take advantage of the flexible nature of the substrates, such as electronics embedded into clothing, large-area flexible displays, and [[rollable display|roll-up portable displays]].
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== In electrochemical devices ==
==See also==
{{Portal|Manufacturing}}
*[[Amorphous silicon]]
*[[Low cost solar cell]]
*[[Printed electronics]]
*[[Slitter|Roll slitting]]
*[[Rolling (metalworking)]]
*[[Thin film solar cell]]
* [[Web (manufacturing)|Web manufacturing]]
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