Printing Technology


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In ancient times, printing was done in the way which was termed as lithography( Today’s printing is the modern lithographic process. The development in printing has extended to micro lithography and nano lithography. The method used for printing of books is also  lithography, which is referred as offset lithography.

Offset lithography depends on photographic processes. Flexible aluminium, polyester or paper printing plates are used instead of stone tablets, as described in the “lithography”.  Modern printing plates have rough surface and are covered with photosensitive emulsion. A photographic negative of desired image is placed in contact with the emulsion and plate is exposed to ultraviolet light. The emulsion shows reverse of negative image. This plate is fixed to cylinder on a printing press. Now, water is applied over it. This is repelled by emulsion of image area. A rubber blanket covered in a cylinder, squeezes away water, picks up the ink and transfers it to paper with uniform pressure. This method is known as offset lithography.

Printing technology has developed and thus the progress are digital printing, 3-D printing and gang run  printing. It would be difficult to imagine the world without the printing technology and it’s development. Books would have been still as manuscripts. Newspaper could not be published daily. Periodicals would not have reached us on the precise period. Johannes Gutenberg is the one who is behind all the development in this printing technology.

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