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 an important impression on each person. From the most obvious examples of newspapers, magazines and comics via to pictures, foreign money and charge cards, or even the fewer seen instance of compact discs, everyone seems to be conversant in 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 influence printing applied sciences are offset lithography, gravure, flexography and monitor printing. most of these applied sciences, together with silver halide images, are mature and feature replaced little over the last few many years. against this, 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 impression (or digital) printers. no longer the entire non-impact printing applied sciences are of equivalent advertisement value. a few, like diazotype and traditional photolithography, are mature and are declining in significance. different applied sciences, although particularly new, haven't accomplished outstanding advertisement good fortune. Electro­ graphy and magnetography fall into this type. the remainder tech­ nologies resembling optical information 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 accomplished striking advertisement luck, particularly ink-jet printing and electrophotography.

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Extra resources for Chemistry and Technology of Printing and Imaging Systems

Sample text

The smaller 2 X A4 webs run at around 20 000 impressions per hour. There is fierce competition between sheet-fed offset and narrow-web offset for short-run multicolour work. Large web competes directly with gravure in publication work and all three process (gravure, flexo and web offset) compete for long-run packaging and label printing. Newspapers are increasingly using web offset as their printing process where the application of digital imaging in black and white and colour allow for rapid plate preparation and high-speed printing with computer-controlled presses.

Careful control of the growth conditions produces a well-defined crystal size, size distribution and shape. In particular, the concentrations of the reactants and their variation during precipitation, the presence of growthaccelerating or growth-modifying additives and temperature control are used to enhance crystal growth along selected lattice planes and to inhibit the growth of others. Cubes, octahedra and twinned tabular crystals or sometimes also compact crystals are the preferred forms of photographically active silver halide 'grains'.

G. higher alcohols such as tridecyl alcohol. 3 Sheet-fed lithographic inks Good-quality book work, calendars, brochures, general printing, packaging and label printing on paper and board use this method of printing, as does metal decorating. The inks, however, are somewhat different for paper and board than those used for metal decorating. The drying process for all these inks is a three-stage process. Firstly, the distillate penetrates the surface of the substrate very rapidly. The highviscosity materials remain on the surface and 'set' due to increased viscosity, at the second stage.

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