Digital printing is also called digital printing. It is the product of the development of computer technology, digital technology and Internet technology. Digital printing realizes from computer to printing or from computer to substrate, which is a new technology of rapid development. In 1991, the machine-to-plate offset printing machine was introduced to the market. Since 1993, various forms of computer-to-plate system have appeared and have been used in printing. In 1995, digital printing really entered the printing industry. Subsequently, various formats and forms of digital printing presses and efficient and economical imaging systems and thermal imaging have developed rapidly. The advent of digital presses and digital printing has opened up new markets for personalized, on-demand printing. Each has its own advantages and disadvantages compared with traditional printing. The basic development trend is to complement each other's strengths, complement each other, and give full play to their own advantages. The digital printing machine is an integrated device of pre-press computer direct plate making (CTP) and printing machine (). Digital printing presses and technology are still evolving. All kinds of digital printing machines and technologies are colorful and varied, "Hundreds of flowers bloom, hundreds of schools contend." Web digital offset printing machine is mainly the printing plate on the plate cylinder of the printing unit is different from the traditional web offset printing machine. Therefore, this section focuses on digital printing plate technology. Digital printing plate technology, web offset press and sheet-fed offset press are the same. 1) The main advantages of digital printing ①can be printed from one (copy) to thousands of (copy) printing, to meet a variety of personalized, on-demand, short cycle, low-volume printing needs; ② variable map Text printing (some people call plateless printing) can achieve continuous printing where the printing information of each print is different during the printing process; ③When the number of printing is small, the printing cycle is short, and the printing price is lower than traditional printing; ④Current The printing quality can meet the general requirements of the public. 3) Main technologies of digital printing Although digital printing has various technologies. The classification methods are different. According to the traditional situation of printing plates, there are three types: constant graphic printing, variable graphic printing, constant and variable graphic printing. ①Unchanged graphic printing (with plate printing): This type of digital printing is actually a computer-based plate-making system added to a traditional printing machine (the plate material is different from the traditional plate). Because there are printing plates similar to traditional printing, it is also called plate printing. The characteristic of this type of digital printing is that after each printing plate is completed, the graphic information is recorded and cannot be erased. Therefore, each printed graphic is the same and variable printing cannot be achieved. If you want to change the printed graphics, you need to make a new plate, and the original printing plate is scrapped. But precisely because the entire batch of prints uses the same printing plate, the consistency of its printing quality is better. Invariable graphic digital printing machines are more similar to traditional offset printing methods. There are mainly three types of digital offset presses with and without water and with and without water. Typical models are various DI digital offset presses. Although DI digital offset presses are used for sheet-fed offset presses, their printing principles can also be used for web offset presses. ② Variable graphics (organization and management of books and other information) printing (no-plate printing): Because there is no printing plate similar to traditional printing or no printing plate at all, people are also called plateless printing. The salient feature of this variable graphic printing is that the graphic information of the "plate" cannot be recorded, and the graphic of the "plate" is erased (disappeared) at the same time every time it is printed. Regardless of whether the graphics of each printed matter need to be changed, each printing needs to be done again a "plate", even if the printed graphics and text are the same, it is necessary to print one to make a "plate". Therefore, this kind of variable graphic printing is particularly suitable for each kind of bill printing. However, because each printed sheet is a newly-made printing plate, it may cause fluctuations in print quality. At present, there are many such digital printing machines. From the perspective of imaging technology, there are mainly the following imaging methods. a. Electrostatic imaging: the basic principle is to first charge the photoconductor on the plate cylinder, use digital graphic information to control the laser exposure, form an electrostatic latent image, then cover the electrostatic latent image with toner, and finally transfer the toner image Print on the substrate. The electrostatic latent image is erased (disappeared) every time it is printed and cannot be recorded. Reprinting requires the latent image to be re-formed. As long as the graphic information that changes to the laser exposure is controlled, the latent images formed are different, therefore, variable printing that is different for each sheet can be realized. The printing system is mainly composed of imaging, inking, toner transfer (printing), toner fixing and other parts. Electrostatic imaging is widely used. Typical models are HP Indigo's E-print1000 and Omnius digital printing presses. The E-print1000 machine is actually a "monochrome offset press" that is "similar to" a "monochromatic offset press" with a "photoconductor film-covered plate cylinder" to make plates directly on the machine (because of the indirect printing rubber cylinder). But it can realize monochrome and multi-color printing. The Omnius machine is a web digital printing machine of the same principle. The imaging principle of digital printing machines of Xeikon, Fuji Xerox, Agfa, Canon, IBM and other companies is also electrostatic imaging. Electrostatic imaging digital printers can use dry toner with lower resolution (usually 600 ~ 800dpi), or wet toner with higher resolution (up to thousands of dpi). b. Inkjet imaging: Directly control the imaging device by using digital graphic data, and the ink is directly sprayed onto the substrate through the nozzle to directly image. It is a true printing equipment without plate and cylinder, which is completely different from traditional printing machine. Inkjet imaging is divided into on-demand inkjet (including thermal foam inkjet, piezoelectric inkjet, electrostatic inkjet) and continuous inkjet. Most water-based inks using dye couplers require special printing materials and inks to achieve their best match. Inkjet resolution is generally 300 ～ 1500dpi. Aluminium Garden Dining Furniture
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2) The main problems of digital printing â‘ It is only suitable for the printing needs of personalized, on-demand, short cycle, small quantity and the printing of bills and prints with variable graphics, and it is not suitable for the printing of large numbers of unchanged graphics; â‘¡ It cannot be satisfied at present The quality requirements of high-quality fine prints; â‘¢ The printing format of digital printing is currently A4, A3, A2, and the largest is A1. â‘£ Digital printing equipment and supporting equipment and equipment are expensive. 