What is XEROGRAPHY?

Non-chemical photographic process in which light discharges a charged dielectric surface. It is the basis of most office photocopiers. An image is projected onto a drum whose surface is a charged dielectric. This is dusted with a dielectric polymer powder, which adheres to the charged areas, rendering the image visible. Permanent images can be obtained by transferring particles to a suitable backing surface eg paper or plastic and fixing, usually by heat. Used for document copying, for making lithographic surfaces, usually on paper, for small-offset printing and as a photoresist,


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