How Does Offset Printing Work
Printing service is used by most companies for different reasons such as marketing and intra-company communications. Hence, it is good to have some basic 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 because of its cost effectiveness for printing of large number of prints. The clients giving big printing orders are recommended by the printers to choose offset printing because of this reason.
Offset printing employs oil based ink, which does not mix with 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 preparing the images. Film negatives were employed in the past for making images and then duplicating them to aluminum based printing plates. In the present times, the printers can use the image setting system for preparing the plates directly. This plate is then placed on a cylinder with the correct side up. Then the water and ink are dispersed on the image plates, in that order. While the ink gets fixed to the image, the water gets stuck to that part of the plate where there is no image so that the ink does not spill beyond the image.
The image is then taken from the plates to the rubber blanket rolled on another cylinder, so that it is inverted. Subsequently, sheets of paper of required dimensions are put together and the rubber blankets transfer the image to the sheets on a third cylinder, where it comes out as the correct side.
Printed sheets are stapled, glued, or assembled in any other manner as required and the printing company sends them after giving some finishing touches.
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