Impressive Technology

Impressive Technology

Photopolymer Plates - The action is a simple theory, photopolymer properties alter under exposure to UV blaze. A alike technology exists in the coating on aluminium lithographic printing plates, both are exposed to UV blaze through a film (positive or negative) and in the condition of 'positive' litho plates the exposed area is washed away however in the condition of photopolymer the unexposed material is washed away while the exposed part is hardened, therefore film negatives are used. Photopolymer is available in a variety of forms and thicknesses with different features, the principle feature for letterpress is the 'shore hardness' which can range from low 20's to encircling 85 for certain steel backed plates, the harder plates (60 upwards) being suitable for deeper impression employment. There are certain issues to keep in intellect - every part of the processing cycle is vital and any variable makes a difference. Each plate type according to it's own specification will require different expos ure times, washout times and temperatures, oven temperatures for drying and advertise exposure and drying times. It sounds complicated however it is surprisingly straight forward.
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