Basic Information You Should Know About Offset Printing

Mar 11, 2010 in advertising

Most companies need a printing service on a regular basis, whether it is for promotional purposes or intra-company communication. Hence, it is good to have some fundamental knowledge of how printing works, particularly offset printing, which is one of the most widely used printing techniques.

The clients and the printers like offset printing due to its cost effectiveness for the production of large number of prints. This is the reason good printing service suppliers recommend the use of offset printing for large volume of prints.

The ink employed during offset printing has oil as the medium and is insoluble in water. In offset printing, rubber blankets play a transitional role in copying the image on the paper, which is to begin with on the plate.

The first step is developing the images. When offset printing started, the images had to be developed by the use of film negatives and they were later put on aluminum plates. However, a modern printing company would now prepare the plates directly by making use of an image setting system. The subsequent step is to attach the plate on to a cylinder in the right manner. Water and ink, in that order, is spread on the image plates. While the ink gets stuck to the image, the water gets attached to that part of the plate where there is no image so that the ink does not spill beyond the image.

After painting it with ink, the image is kept on a rubber blanket which is on a different cylinder, resulting in the image to be inverted. The image is inverted to its correct side by transmitting the image to sheets which have been cut according to the requirement and are put on a different cylinder.

The job of printing is finished by the printing company by providing the final touches to the printed sheets using staples or paste or in any other way as per the needs of the client.

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