No version, digital printing press technology
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Digital printing machines can be divided into two types: digital printing presses and digital printing presses.
A common feature of unprinted digital printing is the implementation of variable information printing. The current non-printing presses can be divided into three ways from a large aspect.
Printless digital press
1. Electrophotographic method
First, the photoreceptor (OPC) is fully charged, and then the image is taken with a laser or the like to generate an electrostatic latent image, and then the electrostatic latent image is covered with the toner, and finally the toner image is transferred onto the paper. The toner has two kinds of powder and liquid. At present, most of the powder toner is used.
2. Electrocoagulation
Such a printing press is generally a printing color set, such as connecting a plurality of sets according to the necessary color number, that is, forming a multicolor printing press. If the turning device is added in the middle, double-sided printing can be realized, and thus it is suitable for printing for various purposes. Moreover, the image quality of the printed matter is close to a continuous tone image.
3. Inkjet method
The inkjet printer consists of a number of nozzles in a dot matrix structure. By accepting the layout information of the computer, the ink is ejected from a very fine nozzle, and the electric field is controlled by an electric field to generate images and graphics on the paper. There are also ink jet printers in which the ejection of ink and the formation of granules are achieved by means of charging and pressurization.
The use of inkjet digital presses is very different in speed and resolution as well as color reproduction areas.
Digital printing press
A digital printing press must have a pre-made plate on the plate cylinder, except that the plate is made directly on the press. Compared with the traditional printing machine, although the printing machine also needs a printing plate, since it is a direct plate making in the machine mode, only one printing machine can complete the data-to-print production process, which saves the equipment. Time, materials, and reduced production costs.
1. Special type printing machine
The main representative model of the special-type printing machine is TruePress. Its basic structure is a four-color printing machine with double-diameter roller structure. It is equipped with Mitsubishi Silver DigiPlate direct plate making and developing equipment to form a composite structure printing machine. .
Thanks to the Mitsubishi Silver Digi Plate direct-making plate, the cost is low, and the printing inks of various properties can be selected according to different needs. Therefore, the printing machine is closer to the printing conditions of the conventional printing in terms of use conditions. Moreover, this type of plate can use UV ink, which solves a series of problems caused by the excessive drying time of the ink in the past printing.
2. Traditional printing machine
The main representative model of the traditional printing press is the Heidelberg SpeedMaster Dl74. This model is based on the traditional printing press SpeedMaster 74, so you can use the PS version or the direct plate making method with a resolution of 2400dpi, the plate is made of PressTek PEARLgold, and the same type of plate.
The digital printing press mentioned above receives the layout information in digital form for printing. Therefore, how to correctly transfer the data of the network or database to the printing machine is a key issue. In the whole process of data transmission, it is necessary to first identify the bottleneck in order to improve production efficiency. In the future, it is necessary to conduct research in the following aspects:
1. Digitization of the entire layout of the printed matter;
2. Digitalization of simulated negatives;
3. Electronic matching, electronic binding;
4. Speed up the calculation time;
5. Data processing compatible with the amount of data;
6. Preservation of layout data;
7. The use of the database.