Offset printing

Offset printing is the printing process factories and businesses use today, the process uses the CMYK colour model. The image is split up into four different base colours; Cyan, Magenta, Yellow and Black.offset-printing

Water is fed onto the water rollers and ink is fed onto the ink rollers, the plate cylinder is dampened by the water rollers before the ink rollers paste ink onto the cylinder. The plate cylinder then prints an image onto the offset cylinder, the paper only comes into contact with the offset cylinder and the impression cylinder therefore giving it a neater finish than if it were to be printed directly from the plate cylinder.

The paper is rolled along to the next unit where a different colour (from the CYMK model) is printed onto the image. The process is repeated in Cyan, Magenta, Yellow and Black before the printing is complete. When all the colours have been printed the pages are stacked on top of each other and separated with a thin coat of powder so that the pages can dry without smudging the ink or sticking together.

The process is expensive to use initially but becomes gradually more valuable than other processes as the quality is the best and the ink consumption is low.

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