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Positive Working Plate
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A classification of plate used for CTP systems in which the unexposed areas of the plate become the image areas of the plate after the plate is digitally imaged with lasers. When a positive working plate is exposed, the CTP imaging system creates non-image areas on the plate. During the exposure process, the laser loosens the emulsion in these areas, which is then washed from the plate, revealing the metal base beneath. The metal base of the plate attracts moisture (printing press fountain solution) during the printing process and the unexposed areas of emulsion, which are the image areas, attract the ink.
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