Chemistry and Technology of Printing and Imaging Systems by P. Gregory (auth.), P. Gregory (eds.)
By P. Gregory (auth.), P. Gregory (eds.)
Printing and imaging has a massive impression on every person. From the most obvious examples of newspapers, magazines and comics via to pictures, forex and charge cards, or even the fewer noticeable instance of compact discs, everyone seems to be acquainted with the top items of printing and imaging. till lately, the most important printing and imaging applied sciences were effect printing and silver halide images. vital impression printing applied sciences are offset lithography, gravure, flexography and reveal printing. these kinds of applied sciences, together with silver halide images, are mature and feature replaced little over the last few a long time. by contrast, the outstanding development of silicon chip know-how over the last 15 years or so has spawned a brand new period of printing and imaging structures, the so-called non effect (or digital) printers. no longer the entire non-impact printing applied sciences are of equivalent advertisement significance. a few, like diazotype and traditional photolithography, are mature and are declining in value. different applied sciences, even though rather new, haven't completed awesome advertisement luck. Electro graphy and magnetography fall into this class. the rest tech nologies reminiscent of optical info garage (the know-how utilized in compact discs), thermography (the expertise utilized in digital photography), ink jet printing and electrophotography are the non-impact printing tech nologies which are either sleek and that have completed notable advertisement luck, in particular ink-jet printing and electrophotography.
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7 Agfa Cristal Raster, an example of frequency-modulated or stochastic screening. (a) Half-tone dots are made of clustered recorder spots. (b) CristalRaster microdot placement does not follow any structure, but is randomised. (c) 200 Ipi 25% tint at 20X magnification. Conventional screening deconstructs an image with screen grids. (d) 25% tint at 20x magnification. CristalRaster preserves all of the image data for photorealistic images. (e) Conventional screening vignette shows gray levels represented by equally spaced half-tone dots.
The modern A3 and larger multicolour presses have computercontrolled inking and damping systems. This, coupled with automatic plate positioning on the press, increases productivity by reducing make-ready times and controlling colour variations during the press run. Very short runs are financially viable with such control systems. Depending on the type and make of the press, speeds of between 10 000 and 15 000 impressions per hour are available. Multi-unit perfector presses are used for book printing in both black-and-white and in colour.
IS classified into publication printing and package TRADITIONAL IMPACT PRINTING 23 Publication printing is normally undertaken on fixed-size, custom-built presses costing many millions of pounds. The process is essentially reel-fed on supercalendered paper. g. 5 metres in length). The multi-unit press prints both sides of the web in four colours with in-line folding to produce finished products. The process is capable of very high quality output, at printing speeds of around 35 000 impressions per hour.