Printing service is used by most businesses for different reasons such as marketing and corporate communications. Offset printing is the most commonly used printing technology and learning about it is therefore helpful and essential.
Offset printing can generate a large number of prints quickly, which makes it more economical than other techniques and also more well known. That is why for bulk orders any good printing company would advise you to go for offset printing.
This printing technique uses oil-based ink, which the water can not dissolve. Its name comes from the fact that in this method, images are not transported directly from the plates to the paper but this is done using rubber blankets as a medium.
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 transferred to aluminum plates. This is no longer needed as the technology exists for making the plates in one step through an image setting system. This plate is then placed on a cylinder with the correct side up. Next, the water is spread on the image plates, which is followed by the ink. The image receives the ink while the rest of the area gets a thin film of water, which makes sure that the ink does not spread outside the images.
The image is then transferred from the plates to the rubber blanket spun on another cylinder, so that it is inverted. Subsequently, 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 right side.
The job of printing is completed 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.
The most common kind of offset printing uses photosensitive chemicals and photographic techniques in transferring pictures and typing from source materials to printing plates. In present use, master copy may be an actual photographic print and typeset text. Yet, it is more common, with the prevalence of computers and digital images, that the source material exists only as data in a digital printing system.
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