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– Toyota Motor Europe
About Litho Printing
Offset litho is a method of printing at an industrial scale in which inks are transferred onto aluminium plates to make an impression.
The process:
1. All printed colour images are made up of primary colours: cyan (blue) magenta (red) yellow and the key colour black (CMYK). The design (artwork) is set-up on a computer and all the colours on the artwork are separated into CMYK and sent to the plate making facility.
2. The artwork, now split into 4 individual colours, are exposed just like a photograph onto photosensitive aluminium sheets, known as ‘Plates’.
3. The Plates are collected by the printer and inserted into the press by clipping onto a roller. Each plate is coated with its corresponding colour by a smaller ink roller. The coloured image is rolled or ‘offset’ onto a cylinder (blanket), which makes an impression on paper being fed through the press. As the paper moves through each set of rollers, the colours mix to create a full-colour image on the page.
4. The pages are guillotined and collated. They are then taken to the finishing department for binding, punching, numbering etc.
Each Colour = 1 Plate
When Would Litho Printing Be Used?
This method of printing is suitable for anything from leaflets to larger quantities such as books, magazines and catalogues.