Bare-type inkjet CTP offset printing plate

In recent years, inkjet printers have achieved great development, mainly reflected in higher print speeds and print resolutions, longer printhead life, and higher quality screening, such as the Epson 4800, 7800, and 9800 printers. Century Iridium K3 pigment ink has a resolution of 2880×1440 DPI and a minimum droplet size of 3.5 picoliters. Fine ink droplets and intelligent droplet conversion technology ensure high-quality output. The precision of the laser imager 175 line/2540DPI is achieved, so that it can be used for color printing plate making. In addition, the inkjet printing system equipment and consumables are relatively low-priced and the process is simple, resulting in low platemaking costs. This makes the ink jet type plate making rapid development, can be widely used in printing books and newspapers.

First, inkjet CTP plate making process and advantages:

Inkjet CTP platemaking process can generally be divided into PS version inkjet CTP plate and bare version inkjet CTP plate.

1. PS version inkjet CTP version

The PS plate type inkjet CTP plate is coated with a transparent ink absorbing layer on an ordinary PS plate, and then printed on the ink absorbing layer with an ink jet printer. After printing, developing and washing, the printed plate can be hung up. Compared with the traditional PS plate process, it eliminates the need for film, imposition process and corresponding equipment. At the same time, the plate making time is shortened, and the plate making cost is greatly reduced. The PS version CTP plate has been successfully developed by Pratt and Beijing Institute of Graphic Technology in China and it has begun production and sales.

2, bare version inkjet CTP version

Bare-type inkjet CTP offset plates do not require image printing. There are two types. The first one is to apply a layer of ink absorption layer on the sand aluminum plate base, and then ink-jet image on the absorption layer. The absorption layer must have strong ink absorption and high adhesion to the aluminum plate base. degree. The second type is inkjet imaging directly on a sand aluminum plate.

Second, foreign bare-type inkjet CTP version

The main manufacturers of bare-plate inkjet CTP plates abroad are Jetplatesystems of the United States and Glunz&Jensen of Denmark. Jetplatesystems of the United States successfully launched the JetPlateCTP system. It was developed based on the Epson StylusClour3000 inkjet printer. It improved the actuator to make the positioning accuracy of the printing plate reach ±0.05mm and printed on the plate using a special plate-making ink called liquid light. The ink is chemically reacted with the coating applied on the aluminum base plate and fixed on the aluminum plate. After the development treatment, the non-graphic coating is removed and the solid plate treatment is performed to obtain a printing plate that can be used for printing on the machine. . JetPlateCTP system imaging resolution of 2880DPI is equivalent to 175 lines/inch. It can print 15 plates per hour. After two baking plates, the printing force can reach 100,000 prints. It is a printing plate that does not require printing, but still requires post-processing operations such as development and washing.

The second bare inkjet CTP version

The second type of bare inkjet CTP plate, which is directly printed on the aluminum plate base of the electrolytic sand which is not coated with photoresist, and made into a printing plate. For example, the PlateWriter 4200, a plate printer plate printer of Glunz & Jensen, which is based on the principle of spraying a liquid dot (LiquidDot) with a 4200 system on an electrolysis-grained and anodized aluminum substrate. The imaging solution is formed into an image, which is then sent to a printing plate processing apparatus for drying, so that the liquid spot image is fixed on the printing plate, and finally the plate is completed by applying a protective glue.

The ink jet printing device of the plate printing machine 4200 system is composed of 540 nozzles, which can realize high-definition printing with an output accuracy of 175 lines/inch. The plate making speed is 5 to 15 pages per hour.

Third, the domestic bare version inkjet CTP Edition

Recently, the domestic company Pratt has also successfully developed bare-type inkjet CTP offset printing plates, and exhibited at the 2007 Langfang Printing Exhibition and 2007 Beijing International Printing Exhibition. Its difference with foreign bare-inkjet CTP offset printing plates is that foreign countries need to use special printing equipment, such as the American JetPlate4000 and Jetplate7600 system printers, Denmark's PlateWriter4200 system printers. Barrett's bare inkjet CTP offset printing developed by Pratt can use common Epson inkjet printers to print images on aluminum plates that have been electrolyzed and oxidized. This saves the cost of investing in specialized equipment.

Pratt has developed a pigment ink that can be printed on a bare aluminum base and suitable for on-machine printing. The pigment ink has a suitable viscosity and the print does not block the ink head. After the ink is printed on the aluminum plate base, it can quickly attach to the plate base and will not flow and cause graphic blur, and it can cause cross-linking by heating, which will quickly cure the graphic and improve the printing plate's resistance to printing. This type of pigment ink was used to print on the aluminum plate base after electrolysis and oxidation, and then a bare-plate ink-jet CTP offset plate was prepared through a solid-plate treatment (240-250° C. solid for 2-5 minutes).

The Barrett inkjet CTP version produced by Prairie uses Epson 1800 and 4800 inkjet printers, and the print resolution can reach 5760×2880 and 2880×1440, and the resolution can reach 175 lines/inch or more. The printed image has clear text and the platemaking speed is 6-12 pages per hour. India's resistance to 30,000 India. Good printability, can be printed with alcohol fountain solution or water fountain solution.

Fourth, printing plate advantages

The bare inkjet CTP version has the following advantages:

(1) Belonging to the Environment-friendly CTP Version

Instead of film and other materials and imposition processes, computers directly publish. The plate making process is simple and does not require drying, development, washing and other processes, shortening the plate making time, and no environmental pollution. It is an environmentally friendly printing plate material.

(2) Reduced platemaking costs

The printability of the bare-plate inkjet CTP plate is the same as that of the PS plate. It is familiar to the printing industry, but the plate-making process is reduced. No need for film processing and imposition, printing, developing, washing and other processes, is a free handling type CTP plate. It is convenient and environmentally friendly, and due to the low price of current inkjet printers and the low price of ink, it significantly reduces the overall cost of platemaking, so it is suitable for promotion and application.

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