Analysis of the most popular digital printing with

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With the increase of information, the rapid growth of digitization and computer road has also brought great changes to the printing industry. The diversification of personal lifestyles and the desire for personal expression have changed the nature of the media, and the flow of information has begun to show signs of changing from the original one-way to two-way. In the printing business, the on-demand printing method of printing the compiled data according to the required quantity by using the Internet has been started

as a huge equipment industry, the printing industry has come with the goal of improving productivity. In recent years, due to the digitization of information processing technology and the rapid development of hard copy technology, especially based on the technology cultivated by family needs and business needs, inkjet and electronic photography have promoted high-resolution and high-speed, seeking to expand on-demand printing. In the printing market, short delivery time and small batch are also advocated. Printing machines that can achieve variable printing have emerged, the digitization of printing devices and the reorganization of high-speed data communication have promoted the formation of an on-demand printing environment. As an on-demand printing machine, there are various methods such as ink-jet and electronic photography, and the development of the prototype is still in progress. Now, based on the electro coagulation method, I will introduce the technology of "elcography" of the version free digital printing machine

in order to improve the printing speed and transfer effect, elcorsy and Toyo Ink Co., Ltd. jointly published elcography at NEXPO exhibition in June 1996, and then exhibited model 200elcography press at IPEX exhibition in 1998, printing panchromatic variable data at 200dpi printing speed of 200 feet per minute. There is a factory in Whitmore lake. At drupa exhibition in 2000, The elco400digital press, whose impact force = force * displacement resolution is 400DPI and whose printing speed is 400 feet per minute, is displayed. At present, based on Elco 400, the two companies are developing new models that improve the key parts of the printing machine

elcography's main features:

1) use water-based ink, corresponding to VOC printing mode

2) high speed printing at 400 feet per minute (120 meters per minute)

3) it has a resolution of 400DPI

4) 256 price adjustment can be reproduced

elcography's image formation principle: elcography ink uses the electrochemical resin solidification principle to adapt to the current intensity flowing between the anode and cathode electrodes according to the data signal, generate points of corresponding size, and form an image. The principle of electrocoagulation is derived from the chemical reaction between the functional groups of water-soluble resins (polypropylene amine) and ferric ions on the surface of metal anodes. The resin contains carboxyl and hydroxyl groups. Once water solubility is given, it will be accompanied by reactivity with iron ions

In addition to resins, Elco inks also have pigments for coloring, dispersants for auxiliary pigment dispersion, chloride salts to improve conductivity, etc

1. The passivation layer

of the anode forms the key electrode of the image, which is composed of a metal anode covered by the passivation layer and a tip cathode vertically configured against the anode, filled with Elco ink

on the stainless steel used on the anode of elcography, it has the property of forming a self passivation state, which is easy to be oxidized, and a thin passivation layer of several angstroms (a) inert to chemistry or electrons is formed on its surface. When this layer is forcibly destroyed, it can easily regenerate and form a new passivation layer in the presence of oxygen

elcography's anode is in the shape of a roller, with an interval of about 50 microns. The cathode is configured opposite to the roller. As the anode roller rotates, ink is injected into the gap between the electrodes

2. Activation of cathode and destruction of passivation layer

when there is no current flowing between electrodes, it is inert and does not cause any change. Once the cathode is given a DC pulse corresponding to the image data, the charge will cause the electrical decomposition of chlorine aqueous solution, and the chlorine contained in the ink locally destroys the passivation layer on the anode surface opposite to the cathode, making the anode surface active. The activated stainless steel drum surface will dissolve into the ink according to the amount of ferric ions with pulse length

3. The condensed

dissolved iron ions of the resin react with the carboxyl group of the water-soluble resin dissolved in the ink, attracting the pigment particles dispersed in the ink to form a condensed solid, and finally forming a colored point. The amount of solidified resin is proportional to the amount of dissolved iron ions normally protected and maintained by the ordinary electronic universal experimental machine. The length of current pulse can be adjusted according to the image data, so the amount of solidified resin can be controlled

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