Offset printing / Lithography

Offset printing is a commonly used printing technique where the inked image is transferred (or "offset") from a plate to a rubber blanket, then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water, the offset technique employs a flat (planographic) image carrier on which the image to be printed obtains ink from ink rollers, while the non-printing area attracts a water-based film (called "fountain solution"), keeping the non-printing areas ink-free.

Ira Washington Rubel invented the first offset printing press in 1903.

Offset printing is the most common form of high-volume commercial printing, due to advantages in quality and efficiency in high-volume jobs. The more you print, the less you pay per page, because most of the price goes into the preparation undergone before the first sheet of paper is printed and ready for distribution. Any additional paper print will only cost the client paper price (and ink), which is very minimal. While modern digital presses (Xerox iGen3 Digital Production Press or the family of HP Indigo solutions or Kodak Nexpress solutions, for example) are getting closer to the cost/benefit of offset for high-quality work, they have not yet been able to compete with the sheer volume of product that an offset press can produce. Furthermore, many modern offset presses are using computer to plate systems as opposed to the older computer to film workflows, which further increases their quality.

In the last two decades, flexography has become the dominant form of printing in packaging due to lower quality expectations and the significantly lower costs in comparison to other forms of printing.



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