Printing Processes

A rough guide on key printing processes which you need to know for the GRAPHICS questions in the OCR exam.

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Offset Lithography


Negetives of the desired image are created digitally, with a measured amount of light allowed through them to expose the image. These negatives are then placed in the press and the paper begins to be fed in.

The lithoplate is coated in a thin layer of water which settles in the spaces in the image. The lithoplate then comes into contact with the ink roller which applies a thin layer of ink which then rests on top of the water as they do not mix, means the ink is positioned exactly where the image requires ink.

The Lithoplate then comes into contact with the Offset Blanket Cylinder and the ink and water is transfered. It is then further transfered to the paper in which the image is then printed.

This process is repeated 4 times for the four inks used, Black, Cyan (Blue), Magenta (Pink) and Yellow.

Pros and Cons: Time consuming and costly but produces good quality printing in mass.

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Offset Lithography


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