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Offset lithography is one of the most common ways of creating printed matter. A few of its common applications include: newspapers, magazines, brochures, leaflets, cards, business stationery and books.  Compared to other printing methods, offset litho printing is best suited for economically producing large volumes of high quality prints in a manner that requires little maintenance.  Most modern offset litho presses use computer to plate systems as opposed to the older computer to film work flows, which further increases their quality.

Advantages of offset litho printing compared to other printing methods include:

  • Consistent high image quality. Offset litho printing produces sharp and clean images and type more easily than, for example, digital printing.
  • Quick and easy production of printing plates.
  • Longer printing plate life than on direct litho presses because there is no direct contact between the plate and the printing surface. Properly developed plates used with optimized inks and fountain solution may achieve run lengths of more than a million impressions.
  • Cost. Offset litho printing is the cheapest method for producing high quality prints in commercial printing quantities.
  • A further advantage of offset litho printing is the possibility of adjusting the amount of ink on the fountain roller with screw keys. Most commonly, a metal blade controls the amount of ink transferred from the ink trough to the fountain roller. By adjusting the screws, the gap between the blade and the fountain roller is altered, leading to the amount of ink applied to the roller to be increased or decreased in certain areas. Consequently the density of the colour in the respective area of the image is modified. On older machines the screws are adjusted manually, but on modern machines the screw keys are operated electronically by the computer controlling the machine, enabling a much more precise result.
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