The Working Of An Offset Printer
Jan 21st, 2010 Posted in Business | no comment »Printing service is used by most organizations for varied reasons such as marketing and corporate communications. Therefore, it is important to have some fundamental knowledge of how printing works, especially offset printing, which is one of the most widely employed printing techniques.
Offset printing can produce a large number of prints quickly, which makes it less costlier than other techniques and also more well known. This is the reason good printing service suppliers suggest the use of offset printing for bulk prints.
The ink employed during offset printing has oil as the medium and is insoluble in water. Its name comes from the fact that in this process, images are not transferred directly from the plates to the paper but this is done using rubber blankets as a medium.
The process starts by developing the designs. When offset printing began, the images had to be developed by the use of film negatives and they were later put on aluminum plates. But, a modern printing company would now develop the plates directly by using an image setting system. After this, the plate is stuck to a cylinder with the right side facing upwards. 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 spread beyond the image.
After being painted with the ink, the image is kept on a rubber blanket which is on a different cylinder, leading the image to be inverted. Afterwards, sheets of paper of required proportions are put together and the rubber blankets transfer the image to the sheets on a third cylinder, where it comes out as the right side.
Printed sheets are stapled, pasted, or arranged in any other way as required and the printing company delivers them after giving some finishing touches.
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