![]() The charge attracts the toner to form a visible image on the drum. The mixture is also manipulated with a magnetic roller to present a toner brush to the surface of the drum or belt. The carrier particles have a coating that generates a kind of static electricity. In high-volume xerographic copiers, the drum is presented with a slowly turbulent mixture of toner particles and larger, reusable iron carrier particles. Its image is projected and synchronised with the surface of the moving drum. The document to be copied is illuminated by flash lamps on the platen and passes over a lens or is scanned by a moving light and lens. 1 ChargeĪn electrostatic charge is distributed over the surface of the drum by a current discharge, with the output limited by a control grid or screen. We will only describe a little bit of each step of the xerographic printing process, but obviously the physics of the xerographic process is discussed extensively in a book, of course. In the following we will name the steps of the process applied on a cylinder, as in a photocopier. This is done by heated steel rollers that generate the necessary combination of heat, pressure and radiant energy. Before the new document is ready, the toner must fuse with the paper in some way.The toner particles are then transferred to a print medium by a corona device generating an electric field with the ability to overcome the magnetic field of the toner, thus attracting the toner to the substrate.The image produced on the drum is then bound with magnetically charged toner.The document is then passed over the surface of the photo-sensor drum and illuminated by a laser, this illumination creates the latent image by simply passing through sections of the document without text. ![]() The first step in the Xerography process is to charge a photoconductive metal drum evenly by rotating it on its surface and applying an electrostatic charge.The UV printing can be used after the first xerographic pass when it cools down. They are slowly replacing many traditional offset presses in the printing industry for shorter runs. Today this technology is used in photocopiers, laser printers and digital presses. The first commercial use was the manual processing of a flatbed photosensor (an electrostatic component that detects the presence of visible light) with a copy camera and a separate processing unit to produce offset lithographic plates. What are the advantages and disadvantages of xerography?.
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