The Working Of An Offset Printer
Printing service is used by most organizations for different functions such as marketing and corporate communications. Offset printing is the most frequently used printing technology and knowing about it is therefore helpful and essential.
The users and the printers like offset printing due to its cost effectiveness for the production of large number of prints. The customers giving big printing orders are recommended by the printers to opt for offset printing because of this reason.
Offset printing uses oil based ink, which does not blend 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 developing the images. Film negatives were used in the past for making images and then reproducing them to aluminum based printing plates. But, a modern printing company would now develop the plates directly by making use of an image setting system. After this, the plate is stuck to a cylinder with the proper side facing upwards. Thereafter water, and then ink, is spread on the image plates. The image receives the ink while the rest of the area receives a thin film of water, which makes sure that the ink does not spill outside the images.
The image is then transferred from the plates to the rubber blanket rolled on another cylinder, so that it is reversed. Afterwards, sheets of paper of required dimensions are put together and the rubber blankets transmit the image to the sheets on a third cylinder, where it comes out as the correct side.
Printed sheets are stapled, glued, or arranged in any other way as needed and the printing company sends them after giving some finishing touches.
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