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First, the classification of digital printing
In general, Computer to press and Computer to paper/print are generally classified as digital printing. In this case, the author may wish to give him the following definition that he believes to be accurate: Digital printing refers to the input of various manuscripts (words, images, electronic files, and network files) to a computer for processing, without the need for electric film output and punching. Film, proofing, drying PS version and other processes and time, and directly through the optical fiber network to the C, M, Y, K four-color digital printing press printing or direct color separation of a new printing process. At present, its classification is also relatively large, can be generally classified into two categories: true digital color press and digital offset printing press (also called on-press-imaging system).
Second, digital printing printing process
The digital printing system is generally composed of a graphic-textual prepress processing system, a digital printer, or an illumination system. Printing process flow chart above, the operator according to the user's requirements and the manuscript provided, or from the internet network system, the customer's data file (usually a PDF file), or the customer's own electronic files, etc. into the computer (printing (Pre-processing system); processing of graphic and text data on a computer, making useful adjustments to the color, tone, and gradation of the image, and performing creatives, modifications, and text synthesis that meet the user's requirements. Editing and typography will eventually arrange the ideal patterns and words into the contents and forms satisfactory to the users. The digitized information is finally rasterized by RIP to generate a corresponding monochrome pixel digital signal; then the digital information is output to the electronic data control center, so that color separation can be performed, and digital signals can also be transmitted to the printing press. The laser modulates and emits a corresponding monochromatic laser to scan the plate cylinder. The plate cylinder made of photosensitive material can absorb ink or ink particles after being sensitive, so that the graphic information can be transferred to printing. On the object, complete the printing. 
Third, the characteristics of digital printing
1. The file compatibility is good and easy to operate. Digital printing has strong compatibility, and can accept the output printing of computer files such as Photoshop, Freehand, Pagemaker, Quarkxpress, CroelDraw, etc. and the general documents and images are first edited on a computer and then output printed, and the data source of digital printing can be directly Obtained from the internet, customers transmit their own image information to be printed to their own professional printing company through the Internet. The printing professional company will conduct various processing and then pass the proofing effect through the Internet to the customer. If the customer is satisfied, Can be printed directly on the machine. Digital printing has low requirements for documents, and it can accept various formats of Mac and PC files that are favored by designers of many advertising agencies. It is also convenient and fast for the reception and processing of remote PDF data information. The speed of digital printing.
2. The process flow is greatly simplified and the customer's delivery time can be met more quickly. After digital printing accepts the customer's satisfied computer file, it can generate PS file through fast hardware and software RIP and print it directly. It can also directly divide into four color film through electric sub-system. After printing, it goes through the printing plate of ordinary printing machine. Print. Digital printing usually prints one or two proofs of a printed matter. After the standard test strips are tested and debugged, the finished products can be printed, and the customers are not satisfied with the defects directly, convenient and timely, and the traditional printing process, including output power distribution, Compared with the procedures of proofing, imposition, printing on the PS, and on-machine, it greatly saved time and reduced production costs. Prints that can usually be delivered in 3 or 4 days can be delivered in just a few hours.
3 personalized printing, the number of random, can be printed at any time, modify. The personalization of digital printing is particularly obvious. For example, a partial image of a printed matter needs to be replaced. This is modified in the general printing system. I want to know that the person who knows the printing knows how heavy the repeated work is, but the digital printing This is not a problem. It is only necessary to replace the pictures directly. The number of prints can range from 1 to several thousand. From the standpoint of price and quantity, it is particularly suitable for printing from dozens to hundreds of copies. In addition, if a customer prints in a few days after a certain printing, they can directly print the already-RIP file directly from the digital printer, and even print it directly after the revision, instead of re-outputting electricity as in traditional printing. Fragmentation, proofing, printing, etc., so that there is no material loss.
4. Can print on both sides at the same time. The software and hardware RIP of the color digital printing system can complete the double-sided printing. When the double-sided printing PS file generated according to the customer's requirements is transmitted to the digital printing system, the digital printing system is rasterized by the RIP to form the positive and negative sides. Two sets of CMYK printing units, through computer control, can combine two different computer files into positive and negative sides, and can complete double-sided printing at one time. The two sides have the same size and alignment, and no color copier or laser exists. The proofing machine can only complete single-side printing at a time and the alignment is more difficult.
5. Multi-page support system. Color digital printing comes with a large memory for multiple colors. If each color is equipped with 72MB of memory, that is, CMYK4 color has a total memory of 288MB or more, 68 pages of A4 files can be continuously printed, and one page can be printed in accordance with the page order to facilitate binding.
6. Process simplification Suitable for short-run fast color printing. Digital printing system process simplification is more suitable for the current development trend of the printing industry, small batch, personalized, fast and other features, printing speed up to 4200 / h (A4 single-sided full-color printing) or 2100 / h (two-sided ).
Fourth, the development of digital printing and application prospects
Digital printing technology was developed in the 1990s. Heidelberg, Germany exhibited the GTO-DI digital press on the 1991 Print'91; Israel's Indigo introduced the E-Print 1000 digital press on the Ipex'93, and Belgium's Xeikon. Launched the DCP-1 digital press. Since then, Xeikon has OEMed the technology to AGFA, IBM, Barco and other manufacturers. In Drupa'95, many companies have exhibited their own digital presses, pushing digital printing to one. The climax of development, according to a report from Xerox Corporation in 1997, shows that the annual global color printing products are about 34.8 billion pounds, of which one-third of the tasks can be completed by digital printing technology; the statistics of the famous American market research company CAP Ventures Corporation in 1996 Shows that the sales volume of the global black-and-white digital printing publishing system in 1996 increased by 21% compared with 1995, and increased by 26% in 1997. The global development trend is that large printing machinery manufacturers are rushing to develop their own new products, and the format is becoming larger and larger. Graphic information can be stored or erased. In China, after Drupa'95, some companies have also introduced digital printing systems. According to incomplete statistics, there are currently 60 sets of GTO-DI digital presses in Heidelberg in mainland China, plus companies such as Indigo, Xeikon and AGFA. The total number of products is about 100 sets. So, what is the development prospect of digital printing in China? According to related data, digital printing has obvious advantages. It is the development direction of the world's rapid short-run printing industry. China will also develop in this direction in the future, but China’s economy and the development of the West There is still a certain gap in the development of the national economy, and most of the state-owned enterprises also have poor economic returns. This will inevitably affect the development speed of digital printing technology in China. The overall demand will not be too great, and the regional differences will be greater. The eastern coast For example, Shanghai, Guangzhou, Shenzhen and other relatively economically developed cities have a certain amount of demand, while the economically underdeveloped regions in the Mainland will not have much demand, equipment investment, supplies rely on imports and expensive, high prices of printed products, The source of customers will not be too saturated, so China's printing companies in the introduction of equipment must do a good job of market research, remember to blindly introduce!
Fifth, the introduction of a typical digital printing machine
1. Indigo's E-Print 1000 digital press. The machine adopts a photoconductive plate, scanning and imaging with a laser beam, printing and imaging once at a time. After each printing, the previously formed latent image is eliminated, and a new latent image needs to be re-scanned. Single sheet feeding can be single-sided printing, the paper basis weight is 80g ~ 250g, suitable for small prints of 300 ~ 600 sheets. Each A3 print price is about 1.2 yuan.
The main performance and specifications:
The largest paper: 320mm × 457mm
Printing format: 308mm×437mm
Printing speed: A4 single-sided monochrome 8000 sheets/hour
One-sided four-color 2000 sheets/hour
Double-sided four-color 1000 sheets/hour
2. Xeikon's DCP/32 and AGFA Chromapress digital presses. After the RIP processed graphic information control laser, the laser beam emitted by the laser is directed towards the organic optical semiconductor drum to form an image, and then the fine ink particles are adsorbed thereon to form a toner image on the roller. After printing, the toner is heated and fixed. on the paper. AGFA's Chromapress is a web feed system consisting of a graphic processing system, a paper feeding section, a printing section, and a sheet-fed delivery table. Paper ration: 60g to 250g; resolution 600dpi. Suitable for printing 1 to 1000 prints. A4 double-sided four-color price is about 1.3 yuan.
The main performance and specifications:
The maximum width of paper: 320mm
Standard printing area: 307mm×438mm
The largest printing area: 307mm × 3200mm
Printing speed: A4:35 sheets/sec
A3: 17.5 frames/sec
3. Heidelberg's Quickmaster DI46-4 digital press. Waterless offset printing machine, the printing plate consists of silicone rubber photopolymer. With a satellite structure, four sets of blanket cylinders are arranged around a four-diameter impression cylinder, and the printing plate uses a waterless offset printing plate. Each color set stores 35 plates for continuous replacement on a plate cylinder. The processed digital information is directly scanned by the infrared laser printing plate, the color groups are simultaneously plated, automatically cleaned after imaging, automatically registered, you can print. The main performance and specifications:
Plate size: 400mm×516mm
Paper size: 340mm×460mm
89mm×140mm
Paper thickness: 0.06mm～0.3mm
Printing speed: 10000 sheets/hour
At the conclusion of this paper, the Drupa 2000 exhibition also came to a close. As the highest level event in the printing industry, it once again brought a brand-new idea to the world printing industry. One of the salient features of Drupa2000: Digital Workflow (Digital Workflow) and Cross-media publishing (Trans-Media Publishing Technology). It has made people feel that the era of digitization and networking of the printing industry has come, especially digital printing. Prominently, this year's largest exhibitor Heidelberg Company not only focuses on traditional offset printing, but also invests heavily in digital printing research and development, such as: Quickmaster DI46-4 and Speedmaster DI, both models are using Heidelberg offset printing machine Type, whether quality or performance is considered one of the best products. In addition, Man Roland also exhibited his own hot product DI digital printing machine DicoWeb,
Know digital printing
After the 1990s, with the development of printing technology, the emergence of new process methods, and the widespread use of computer technology in the printing industry, coupled with consumer demand for printed materials, the trend toward personalized, timely, small-batch, fast, etc. The new requirements have brought about revolutionary changes in the printing industry. The printing process has evolved from analog to digital, and the traditional process methods have gradually evolved a new printing process—digital printing and computer-to-computer. Moreover, CTP and digital printing have become the development direction of today's printing industry, becoming a hot topic in the industry; the 28-character guideline for the development of China's printing industry: prepress digital, networking, multi-color printing, high efficiency, beautiful and automated printing, equipment High-quality, serialization, and also clearly put forward the concept of digital printing, the following authors will discuss digital printing from the following aspects.