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Offset Litho

Offset Litho Printing

On what principle does offset litho work? Offset litho works on the principle that grease and water do not mix
How is grease and water used? Grease on the image areas attracts ink. Water on the non-image areas repels ink. Therefore the plate must be dampened before it is inked.
What sort of method is used to print with the plate? Offset litho presses use a rotary method to print, with the plate wrapped around a cylinder.
What are plates usually made from and why? Plates are usually made from aluminium because it is strong, light and "economically viable"
How is the printing image exposed to a plate? The image is exposed to the plate by photographic methods (usually). 1 - Plate is presensitized 2 - Sensitized plate is put in contact with a film image. 3 - This is exposed to very strong light
How is the plate treated after an image is exposed to it? 1 - Plate is treated with an emulsion developer (lacquer + gum etch in solution of acid) 2 - Plate is then rinsed with water 3 - Gum arabic is used to protect the stencil image on the plate 4 - Plates can be baked to last longer
Created by: cloudbusting