Computer-to-plate technology and media characteristics

The resolution of the thermal CTP plate is considered to be the highest resolution among all CTP plates. This is because the laser has a very high heat transfer performance, and it has a large contrast in the lateral position when heated, making it difficult to create differences in thermal curing between graphic and non-graphic parts. Thermal plate is the main direction for the development and use of CTP plates, and silver plate is only in a transitional period. The heat-sensitive CTP plate has the advantages of high energy efficiency, saving precious metals, and meeting environmental requirements. Another feature of the CTP thermal plate is that the material synthesis is relatively simple. The main part of it is the use of a component of the existing positive-acting PS plate sensitizer. Therefore, after imaging, the image part is strongly bonded to the aluminum plate, and the lipophilicity is also it is good. The aluminum plate base used is the base plate of the existing positive figure PS plate. The synthesis method is a general organic synthesis reaction, which is relatively simple, easy to control, high yield, and stable in yield. The CTP thermal plate produced by such a heat-sensitive material is characterized in that the heat of the heat-sensitive layer is promoted to have low heat and high sensitivity, and the developer is an alkaline aqueous solution, which is basically the same as that of the positive PS plate developer. With the in-depth research, the properties and characteristics of the plate will be further understood.

Another of the heat-reactive plates is a stock plate. It can be divided into two kinds: the need for fountain solution and the absence of fountain solution. The waterless printing plate consists of a plate base (aluminum or PET), an ink receptive layer, a metal film layer and a silicone resin layer. The imaging process consists of heating the metal film with an infrared laser, and then removing the topmost oleophobic silicone layer to expose the ink-receptive layer to form a printed portion of the letter A. The unexposed portion of the silicone layer is a non-graphical portion. The above process is completed on the printing press as part of the printing process without the need for stamping operations. Plates are imaged under bright room conditions, with a resistance force of up to 50,000 impressions. The water-based printing plate also consists of four parts: the base (aluminum or PET), the ink-receptive layer, the metal film layer, and the hydrophilic layer. The imaging process of the image part is the same as that of the anhydrous plate, but the non-graphic part is formed on the hydrophilic layer. During printing, the fountain solution adheres to the hydrophilic layer and the ink adheres to the ink-receptive layer.

Dissolving Type Plates Asahi Kasei Corporation's flush-free thermal plate is a disguised plate. It consists of an aluminum base and a photosensitive layer. The imaging process is as follows: The surface of the photosensitive layer that is originally hydrophilic is heated by a nearby infrared laser, and the pigment in the photosensitive layer absorbs heat to make it become an ink-receptive surface, and forms a graphic printing site. The unexposed part of the surface is composed of a hydrophilic resin, and after the fine sand treatment, the fountain solution is maintained and becomes a non-graphic part. This plate does not need to be printed, and it can withstand up to 50,000 impressions.

The development prospects of CTP technology Nowadays, CTP technology has fully demonstrated its superiority in lithography, and its market share is continuously expanding. With the improvement of its technology and CTP plate quality, its market prospect is very broad. It can also be said that it is an important direction for the future development of the printing industry. Using CTP technology, not only can be printed on paper, but also can be printed on other printing materials, such as the use of a variety of plastic films and composite films, metal flakes, wood, glass, ceramics, textiles, etc., now in the field of screen printing It also continues to develop.

In recent years, due to the prepress processing of screen printing, the desktop system has been implemented like offset printing, and the speed and pollution-free printing and post-printing processing have been performed. The screen printing prepress processing system that can directly output the screen printing plate has also been developed. use. As digital technology continues to mature, computer-based CTP technology has also caused a major technological revolution in screen printing. The application of CTP plate making technology in screen printing is mainly exhibited at the International Network Printing Exhibition in the United States and Europe in recent years. It is the migration of inkjet Inkjet Process technology to screen printing CTP plates.

CTP screen printing has the following features:
(1) Reduce the plate making process and achieve the goal of rapid plate making;
(2) Saves on film, because it does not require film, thereby preventing film wear and quality problems caused by the loss of dot layer;
(3) Automatic screen positioning can be performed for multicolor screen printing;
(4) The inkjet coating does not require special photosensitive adhesive, and the commonly used photosensitive adhesive is applicable;
(5) The screen version of various meshes can be done;
(6) It can be used for various frame, aluminum alloy frame and wooden frame;
(7) Plate making up to 66cm x 96.5cm.

& Nnbsp; Screen Printing CTP direct plate making principle is the use of computer digital processing technology to design the required screen printing image, after modification, finalized and stored in the computer. At the time of plate making, a laser ink jet printer was used to print the image on a screen previously coated with a photosensitive resin. This screen is called a pre-printed version (screen printing PS version). The ink-receiving image on the screen acts as a film or a cover film, and then the full-exposure (stencil printing) of the screen is performed with ultraviolet light. The ink-jet portion is not transparent to ultraviolet light, and no chemical reaction occurs, resulting in a difference in solubility. Then, as in the conventional photoengraving, the plate was imaged by exposure, development and imaging.

Screen printing CTP plate, screen printing presensitized photosensitive emulsion used, you can use a variety of traditional traditional plate-making photosensitive adhesive. There are many aspects to laser ink jet ink requirements, but the main two requirements are:

(1) The ink density and ink ejection amount are based on the final image optical density of 3.0 or more.
(2) The connecting resin for ink is preferably water-soluble so that water can be removed during development. However, if the photoresist is positive, the ink-based resin should be oil-soluble.

With the deepening of technology and media research, the superiority of CTP will become more apparent. It will not only save time, manpower, materials, etc., improve printing quality, reduce environmental pollution, but also optimize process flow and build a higher degree of automation Continuous production lines, especially combined with computer technology, will guide the revolution in the printing industry.