The Method Of Offset Printing
Printing service is used by most companies for varied reasons such as marketing and intra-company communications. Hence it is helpful to learn about the basic working of the frequently used printing process called offset printing.
Offset printing can produce a large number of prints quickly, which makes it more economical than other technologies and also more well known. The customers giving big printing orders are recommended by the printers to choose offset printing because of this reason.
This printing technique uses oil-based ink, which is not soluble in water. The offset printing is so called because the designs are transferred indirectly from the plates to the paper by use of rubber blankets as the agents.
The first step is developing the images. When offset printing started, the images had to be made 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 making use of an image setting system. The next step is to attach the plate on to a cylinder such that it is spot on. Thereafter water, and then ink, is spread on the image plates. While the ink gets stuck 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.
Next, the image is inverted when it is put on to a rubber blanket which is stuck to another cylinder. Afterwards, sheets of paper of desired 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.
The work of printing is completed by the printing company by consolidating the printed sheets using staples or paste or in any other way as per the requirements of the client.
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