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What is a hot melt CTP plate?
One of the thermosensitive type. It consists of three parts: aluminum plate, ink-receptive layer and PVA layer (used in conventional offset printing) or silica gel (used in waterless offset printing) without roughening. The imaging principle is the use of semiconductor laser diode exposure. The thermosensitive coating (ie, the ink receptive layer) on the plate is ink-receptive and insoluble in alkaline potions. After exposure, the coating absorbs energy, increases solubility, and can be dissolved in alkaline solutions. During development, the exposed portion is dissolved in alkaline solution to form a blank portion of the printing plate. The non-exposed portion is insoluble and forms the graphic portion of the printing plate. After development, it is generally cleaned and glued before printing on the machine.