Current situation and new development ideas of the

2022-09-27
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The current situation and new development ideas of inkjet CTP

the significance of inkjet CTP

as a plate making process, inkjet CTP system appeared as early as the 1970s. In 1978, hoechsh company of Germany applied for a patent (the patent number is German patent number) for the inkjet plate making technology developed by the company. The patent uses the aluminum plate base with surface roughening and anodizing treatment, uses water-based or oil-based ink to perform ink-jet printing and imaging on the ink-jet printing equipment, heats it at 120 ℃, and then hydrophilizes the blank part before it can be printed on the machine

inkjet CTP technology can use ordinary PS plate as the plate base, the photosensitive coating can be photodegradation or photopolymerization, and it can also print and image directly on the porous aluminum plate obtained by roughening and anodizing. The inks used can be water-soluble inks, thermosetting inks, UV curing inks, etc. It can be printed on ordinary PS plate, and can be printed on the machine after printing and developing; After printing on the bare plate (that is, only roughening and oxidation treatment, but not coating the plate base with photosensitive coating), it can be directly printed on the machine only by curing. This is a non wet treatment printing plate. Inkjet CTP has no pollution to the environment and is called green product. As Bob, CEO of poly light company, said: from the perspective of long-term development, please contact us for more information about the latest conference of this year: type printing plate has great development potential, because it is a real green plate

from the above, the plates used in the inkjet CTP system are ordinary PS plates or blank plates with uncoated photosensitive layers, so the cost is low. It should be equivalent to or cheaper than PS plates. The advantage of CTP is that it saves film, saves money, and reduces environmental pollution. The inkjet CTP system goes further on the basis of the original CTP technology

current situation of inkjet CTP

the plate making process of inkjet CTP plate is generally divided into two types: indirect inkjet CTP plate making and bare inkjet CTP plate making. The indirect inkjet CTP plate making process is to spray the special imaging ink on the plate through the inkjet plate making machine to form graphics and text. This imaging ink reacts with the emulsion layer on the traditional aluminum plate and is fixed on the aluminum plate; The bare plate inkjet CTP plate making process is to directly spray the imaging solution on the uncoated aluminum plate whose surface has been roughened and anodized, and then fix the imaging solution on the aluminum plate after drying and surface treatment

at present, jetplate systems of the United States and glunzjensen of Denmark are the leaders in inkjet CTP. Both companies claim that their CTP systems have reached the imaging quality of 175 lines/inch

jetplate systems of the United States has recently launched the two-way jetplate4800 and four way jetplate7800ctp systems. The jetplate system adopts the indirect inkjet CTP plate making process. First, a special imaging ink called liquid light is sprayed on the plate through the plate making machine to form an image. This special ink for imaging can react with the emulsion layer on the traditional aluminum plate and fix it on the aluminum plate, and then manually place the aluminum plate on the inlet platform and conveyor belt of the developer, The transmission system takes the printing plate into the developer, and completes the following processing steps in turn: first, the hot air is used to accelerate the reaction between the liquid medicine and the emulsion layer, so that the ink can be quickly fixed on the printing plate; Then the printing plate is developed by the developer and the rotary brush to remove the emulsion of the non graphic part; Wash the printing plate in the water washing tank to remove the residual developer on the printing plate; Finally, bake the printing plate to obtain a dry and durable printing plate ready for machine printing

as the world's leading supplier of CTP developers, glunzjensen company recently launched the platewriter2000 CTP inkjet system. The platewriter system adopts the bare version inkjet CTP plate making process, directly spraying the imaging solution (liquiddot) on the uncoated aluminum plate whose surface has been roughened and anodized. The imaged plate is manually sent to the plate processing device for drying, so that the imaging solution can be fixed on the plate surface, and the plate is coated with protective glue by the built-in glue table in the plate processing device, Prepare for printing

new ideas for development

over the years, the printing tensile testing machine has been widely used. The brush industry hopes to have low-cost CTP equipment and plates, with advanced technology, simple process, safe use, convenient equipment maintenance, and green products that do not pollute the environment. At present, inkjet CTP system and plates can do all this. More specifically, indirect CTP plate making has taken a small step forward in environmental protection printing, while bare CTP plate making has taken a big step forward

the advantages of bare version inkjet CTP plate making are as follows:

(1) it is an environmental friendly CTP plate. The plate making process is simple, without printing, developing, washing and other processes, which shortens the plate making time and has no environmental pollution

the rotating shaft torque durability testing machine adopts high-precision load element measurement and stepping electromechanical drive

(2) reduces the plate making cost. The printability of the bare version inkjet CTP plate making is the same as that of the PS version, which is familiar to the printing factory, but the plate making process is reduced, and there is no need for film, plate making, printing, developing, washing and other processes, so the comprehensive cost of plate making is greatly reduced

inkjet CTP is developing rapidly in plate making technology, and bare version inkjet CTP plate making is gradually emerging in inkjet CTP. Facing this huge temptation, what should domestic printing enterprises pay attention to

(1) micro arc alumina base plate

the preparation of micro arc alumina base plate includes complex technological processes such as oil removal, electrolysis, oxidation, etc. at the same time, the requirements for parameter control and production environment are very strict. Therefore, the production of oxidation plate generally adopts industrialized, mass production lines to produce continuously without shutdown, which also makes it difficult to supply a small amount of intermittent oxidation plate. Therefore, the first idea is how to adopt new processes, simplify the process, and supply oxidation plates on demand and in workshops

(2) imaging solution

if the main components of the thermal CTP plate coating are converted into inkjet printing ink, the fatigue life of the experimental alloy is prolonged; The fatigue small crack stage accounts for 70% - 80% of the fatigue life. The ink can be directly sprayed on the aluminum base surface with anodic oxide layer after electrochemical treatment for imaging, and then cured by heat treatment before being printed on the machine. There is no need to develop, wash and other wet treatment processes, and there is no pollution to the environment. It should be interesting to turn the complex thermal CTP plate making system into such a simple application

(3) print quality and efficiency

the quality of inkjet CTP prints should compete with traditional CTP prints, and improving image quality and resolution is the key. In order to improve the image quality, it is necessary to reduce the size of ink droplets ejected by the printing equipment. Because the particles of ink droplets are fine, the image dots formed on the surface of the printing plate are also fine. In this way, the picture is more subtle, the layers are rich, the color transition is soft, and the texture is stronger. Therefore, reducing the ink drop size of the printer is also an idea. Inkjet printers generally use progressive scanning printing, so when applied to large format, speed is a problem that must be considered. When CTP plate making is carried out with printing equipment, single black ink is used. From epsonstyluspro9000 to 10000 inkjet printing equipment, the number of nozzles is increased from 64 to 180, and the printing speed is increased by nearly 2 times. If it is feasible to further increase the number of nozzles, inkjet CTP will enter the market with great hope

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