Download Chemistry and Technology of Printing and Imaging Systems by P. Gregory (auth.), P. Gregory (eds.) PDF

By P. Gregory (auth.), P. Gregory (eds.)

Printing and imaging has a big influence on everybody. From the most obvious examples of newspapers, magazines and comics via to pictures, foreign money and charge cards, or even the fewer visible instance of compact discs, everyone seems to be conversant in the tip items of printing and imaging. till lately, the main printing and imaging applied sciences were effect printing and silver halide images. very important impression printing applied sciences are offset lithography, gravure, flexography and reveal printing. most of these applied sciences, together with silver halide images, are mature and feature replaced little over the last few many years. by contrast, the exceptional progress of silicon chip expertise during 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 value. a few, like diazotype and standard photolithography, are mature and are declining in value. different applied sciences, although quite new, haven't accomplished striking advertisement luck. Electro­ graphy and magnetography fall into this type. the rest tech­ nologies corresponding to optical info garage (the expertise 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 smooth and that have accomplished awesome advertisement good fortune, in particular ink-jet printing and electrophotography.

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Any number of printing colours can be imaged in this way as each screen frame is preregistered in the Screenjet machine. Image areas up to 510 X 737 mm at 300 dpi are available. This system eliminates the use of film entirely, gives accurate registration and reduces press set -up times. 5 Digital printing The first direct digital printing press, the Heidelberg GTO-DI is based on a conventional litho printing press. The uniqueness of this press lies in the plate making technology. The printing plates are exposed directly on the press from digital information.

The illustrations are of the Agfa Cristal Raster process. FMS would also appear to make digital imaging direct to plate more attractive in terms of speeds of production and quality of output. There is no doubt that FMS eliminates moire patterns and rosettes, giving colour printing a smoother, more continuous tone appearance. It also gives better definition and better depth of colour than conventional AMS techniques. 4 Digital platemaking The production of films for platemaking for text, line and half-tone illustrations directly from digital information is now standard practice in the printing industry.

2 PRINTING AND IMAGING SYSTEMS The photographic emulsion (Berry, 1977; Lapp, 1992) The term 'photographic emulsion' relates to a dispersion of silver halide microcrystals prepared in an aqueous solution of gelatin or another natural or synthetic protective colloid. The main functions of the colloid in emulsion preparation can be seen in providing the desired growth control and preventing the crystal nuclei from undesired multiple agglomeration. Gelatin is a polypeptide and in its 'natural' state dissolves in water above 30°C.

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