Most companies require a printing service on a regular basis, whether it is for promotional purposes or intra-company communication. Offset printing is the most commonly used printing technique and knowing about it is therefore helpful and essential.
The clients and the printers like offset printing because of its cost effectiveness for printing of large number of prints. The customers giving bulk printing orders are recommended by the printers to choose offset printing because of this reason.
The ink used during offset printing has oil as the medium and does not dissolve in water. The offset printing is so called because the designs are transferred in an indirect way from the plates to the paper by use of rubber blankets as the medium.
The first step is preparing the images. Previously the images were produced by creating film negatives and were then transmitted to aluminum printing plates. In the current times, the printers can make use of the image setting system for preparing the plates directly. The subsequent step is to transfer the plate on to a cylinder such that it is spot on. Thereafter water, and then ink, is spread on the image plates. The image gets the ink while the rest of the area receives a thin film of water, which ensures that the ink does not spill beyond the images.
The image is then taken from the plates to the rubber blanket rolled on another cylinder, so that it is reversed. Subsequently, sheets of paper of desired proportions 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.
Printed sheets are stapled, pasted, or arranged in any other manner as required and the printing company delivers them after giving some finishing touches.
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