Digital presses can be divided into two types: digital presses without a plate and digital presses with a plate.
The common feature of unprinted digital printing is the realization of variable information printing. The current non-printing presses can be divided into three ways from large-scale non-printing digital presses. The electrophotographic system first charges the photoconductor (OPC) first, and then uses an image light such as a laser to generate an electrostatic latent image, then covers the toner on the latent electrostatic image, and finally transfers the toner image to the paper. There are two types of toner: powder and liquid. At present, powdery toner is mostly used.
2. Electrocoagulation This type of printer is generally a set of process colors. If multiple groups are connected with the necessary number of colors, they constitute a multicolor printer. With the addition of an inverting device in the middle, it is possible to print on both sides, which makes it suitable for printing in various applications. Moreover, the image quality of prints is close to continuous tone images.
3. The ink-jet ink-jet printer is composed of a number of nozzles in a dot matrix structure. By receiving the computer's layout information, the ink is ejected from a very fine nozzle and the electric field is used to control the direction of the ink jet to generate images and graphics on the paper. There are also ink jet printers in which ink jetting and green pellet formation are achieved by means of charging and pressurizing. The use of inkjet digital printers is very different in speed, resolution and color reproduction area.
Digital presses with digital plates There are plate digital presses that must have preprinted plates on the plate cylinders, except that they are made directly on the printing press. Compared with traditional printing presses, although this type of printing press also needs a printing plate, since it is a direct plate making machine, only one printing machine can complete the production process from data to printed matter, which saves equipment. , time, materials, and reduced production costs.
1. The main representative model of the special-purpose printing press-dedicated press is TruePress. The basic structure of the special-purpose printing press is a four-color printing machine with a double-diameter cylinder structure, equipped with a Mitsubishi Silver DigiPlate direct plate making and developing device to form a composite type. Structure of the printing press.
Because Mitsubishi's Silver Digi Plate is used for direct plate making, the cost is lower, and printing inks of various properties can be selected according to different needs. Therefore, this printing press is closer to the printing conditions of traditional printing in terms of use conditions. Moreover, this plate can use UV ink to solve a series of problems caused by the long drying time of the ink in the past printing.
2. The main representative model of the traditional type printing press is Heidelberg SpeedMaster Dl74. This model is based on the traditional printing machine SpeedMaster 74, therefore, can use the PS plate or plate making method with a resolution of 2400dpi, the plate is used by PressTek's PEARLgold, and the same type of plate.
The above-mentioned digital printers print the layout information in digital form. Therefore, how the network or database data is correctly transmitted to the printer is a key issue. In the entire process of data transmission, the bottleneck must be clearly identified in order to increase production efficiency. It is necessary to conduct research in the following areas in the future:
1. Digitization of the whole page of prints;
2. Digitalization of analog negatives;
3. Electronic matching, electronic binding;
4. High-speed computing time;
5. Data processing adapted to the data volume;
6. Layout data preservation;
7. The use of the database.
The common feature of unprinted digital printing is the realization of variable information printing. The current non-printing presses can be divided into three ways from large-scale non-printing digital presses. The electrophotographic system first charges the photoconductor (OPC) first, and then uses an image light such as a laser to generate an electrostatic latent image, then covers the toner on the latent electrostatic image, and finally transfers the toner image to the paper. There are two types of toner: powder and liquid. At present, powdery toner is mostly used.
2. Electrocoagulation This type of printer is generally a set of process colors. If multiple groups are connected with the necessary number of colors, they constitute a multicolor printer. With the addition of an inverting device in the middle, it is possible to print on both sides, which makes it suitable for printing in various applications. Moreover, the image quality of prints is close to continuous tone images.
3. The ink-jet ink-jet printer is composed of a number of nozzles in a dot matrix structure. By receiving the computer's layout information, the ink is ejected from a very fine nozzle and the electric field is used to control the direction of the ink jet to generate images and graphics on the paper. There are also ink jet printers in which ink jetting and green pellet formation are achieved by means of charging and pressurizing. The use of inkjet digital printers is very different in speed, resolution and color reproduction area.
Digital presses with digital plates There are plate digital presses that must have preprinted plates on the plate cylinders, except that they are made directly on the printing press. Compared with traditional printing presses, although this type of printing press also needs a printing plate, since it is a direct plate making machine, only one printing machine can complete the production process from data to printed matter, which saves equipment. , time, materials, and reduced production costs.
1. The main representative model of the special-purpose printing press-dedicated press is TruePress. The basic structure of the special-purpose printing press is a four-color printing machine with a double-diameter cylinder structure, equipped with a Mitsubishi Silver DigiPlate direct plate making and developing device to form a composite type. Structure of the printing press.
Because Mitsubishi's Silver Digi Plate is used for direct plate making, the cost is lower, and printing inks of various properties can be selected according to different needs. Therefore, this printing press is closer to the printing conditions of traditional printing in terms of use conditions. Moreover, this plate can use UV ink to solve a series of problems caused by the long drying time of the ink in the past printing.
2. The main representative model of the traditional type printing press is Heidelberg SpeedMaster Dl74. This model is based on the traditional printing machine SpeedMaster 74, therefore, can use the PS plate or plate making method with a resolution of 2400dpi, the plate is used by PressTek's PEARLgold, and the same type of plate.
The above-mentioned digital printers print the layout information in digital form. Therefore, how the network or database data is correctly transmitted to the printer is a key issue. In the entire process of data transmission, the bottleneck must be clearly identified in order to increase production efficiency. It is necessary to conduct research in the following areas in the future:
1. Digitization of the whole page of prints;
2. Digitalization of analog negatives;
3. Electronic matching, electronic binding;
4. High-speed computing time;
5. Data processing adapted to the data volume;
6. Layout data preservation;
7. The use of the database.
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