CTP platesetter thermal plate

There are many types of thermal plate materials for CTP platesetters. There are two types of mature plates, namely, hot melt type and heat crosslinked type.

The hot-melt type CTP plate is mainly composed of an aluminum plate, an ink-receiving layer, a PVA layer (used in conventional offset printing) or a silica gel (used in waterless offset printing) which do not require roughening. Its imaging principle is the use of semiconductor laser diode exposure. The heat-sensitive coating (ie, the ink-receptive layer) on the substrate is ink-repellent and insoluble in alkaline syrup. After exposure, the coating absorbs energy, improves solubility, and dissolves in alkaline syrup. At the time of development, the exposed portion is dissolved in the alkaline syrup to form a blank portion of the printing plate. The non-exposed portion does not dissolve and constitutes the graphic portion of the plate. After development, it is usually cleaned and glued before it can be printed on the machine. The thermally crosslinked CTP plate mainly consists of a roughened aluminum plate and a single layer PS photosensitive layer. Its imaging principle is exposed by infrared light. During exposure, the photothermal conversion material converts the light energy of the infrared laser into heat energy, causing some of the polymer in the photosensitive layer to thermally crosslink and react to form a latent image; and reheating, so that the molecular compound in the graphic part is further attacked and cross-linked. So that the graphic portion is not dissolved in the alkaline developer. It should be noted that when preheating, the blank portion also has a partial reverberation, so the impression of the blank portion is removed during development. If the temperature is too high, it will form a hot mist on the printing plate; if the temperature is too low, it will weaken or weaken the graphic part.

Features of thermal CTP plates

(1) The thermal CTP plate has a low sensitivity to natural light and is exposed to infrared laser light, so it can be operated under bright room conditions.

(2) The thermal plate has to generate an impression, it is necessary to reach the initial thermal energy threshold, and the thermal energy higher than the initial threshold does not change the shape of the dot. It is a technology that can only manipulate the predicted results, the quality is easy to control, and the quality of the book is stable. Moreover, the exposed plate can be extended to 6 months before development, and there is no slight influence on the quality of the plate.

(3) The thermal CTP plate has good reproducibility and high resolution, and the edge of the dot is sharp and sharp. It is easy to reach the ink balance during printing. It has excellent printability and the printing durability of the plate after baking. More than 1 million prints.

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