Electromagnetic Printing
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First, the printing engine printing engine is composed of several simple and reliable subsystems. The basic body of the engine is the drum, which is based on hard metal and is similar to the application of photocopying technology. The other subsystem is similar in function to other non-contact technologies, but its structure is actually quite different. The surface structure of the printing cylinder is a layer of electromagnetic hard layer, and the electromagnetic is placed on the magnetically soft material with a magnetic strength of about 500oerst.
In fact, the mechanical resistance of the roller surface is quite strong without the use of soft coating. The life of the roller is over 15 million feet long, and the electromagnetic printing technology can match different image lengths to meet the needs of printing applications without having to To change the diameter of the roller, you only need to increase the speed of the printing engine.
The magnetic afterimage on the drum can be degaussed by the elimination bar each time it is rotated so that the drum can continue to receive new magnetic images.
Second, the recording head image recording station contains an array of electromagnetic recording write head, axially parallel to the drum, and its processing process is similar to the recording head of the disk drive in the computer, but is specially designed for electromagnetic printing applications. The first-generation recording heads used in the early days were used for vertical recording. During operation, the coils did not change in succession. Therefore, lower drive currents could be used in the range of 100-150 microamperes, resulting in higher magnetic efficiency. Can make the lateral density higher. It is impossible to use a traditional recording and writing structure. The recording head has a density of 240 poles per inch to form 336 poles per square. The development of electronics has made the recording heads of second-generation electromagnetic printers better, that is, in order to exceed the 240 dpi currently used, it is necessary to consider the use of collective recording and writing components, combined with standard silicon micro-electrochemical treatment and silicon electrochemical precipitation, so that magnetic collection With the electromagnetic microstructure becomes possible. The electromagnetic silicon recording head includes a one-inch square silicon chip. The recording head is a high-density array recording electromagnetic, which is positioned by a diode matrix on the chip. This new recording head allows for higher print quality, better stability, and higher speed recording heads.
The function of the electromagnetic recording and writing head is similar to the imaging effect of the reflected beam in the laser copier, the light emitting diode in electrophotography, or the ion card sandwiched in the electron beam.
3. After the latent image and image recording head are opened, a magnetic dot is written on the surface of the drum. Each magnetic dot forms a permanent magnetic field and forms a latent image. The external magnetic field around the drum surface image is very low (about 100 to 200 oersted) However, the magnetic field shows a particularly high sharpness, an important factor being due to the use of toner for imaging.
The main advantage of electromagnetography is the permanent image. When the image is produced, many copies can be printed without rewriting. In fact, once recorded on the roller, it can be maintained for a long time without magnetic interference. This feature is related to other non-contact printing technologies. different places. As the drum rotates past the development station, a single group of toner particles is adsorbed on the magnetic image, which can reduce many of the problems associated with conventional two-group toners. Og, if necessary, supervise the concentration of toner added to the spreader. Actually, in the past, to eliminate the problem of a single group of toners, after the image is developed, a vacuum knife or a trimming pinhole is used to remove it, so that the excess toner can be removed and a more sharp image can be formed.
4. The transfer of image transfer images is based on 60% mechanical pressure and 40% static electricity. The resulting transfer efficiency is about 80-85%. The use of electrostatic electricity in certain aspects is quite related to the humidity of the air. If an ideal transfer is desired, the surface of the printed material cannot have excessively high humidity. If the toner resistance is around 103 W/cm, the charging voltage of the conductor is For 500-1000V, the selected concentration is 1.1 to maintain the resistance at 1012 W/cm. If the toner is charged first, the selected value is 1.3 and 1.1, which can reduce the resistance of the paper to 1010W/cm.
Fifth, the fixed image fixation method is the same as any dry powder printing technology except that it is dried at a high speed. Fixing requires the use of radiant heat or a xenon flash to turn the toner into a semi-liquid state. In the low-speed device, the heating roller can be used, and in the magnetic printer, radiant heat is used to fix the image. In recent years, the flash-fixing method has been cited, which has the advantages of significantly lowering the paper surface temperature and also reducing many problems caused by heat, such as reduced heat energy consumption, maintenance fees, and the like. The next processing unit on the drum is the cleaning station, which removes the remaining toner that has not been transferred to the paper on the drum. In fact, the toner is sucked into the bottle using a steel roll with a scraper and a vacuum suction device.
The last step is to remove the magnetic image on the drum, that is, to use a low voltage wiper to replace the bulb in the electronic copying machine and the high voltage pre-charged toroidal discharge wire.
Six, the commercial application of electromagnetic printing Electromagnetic printing presses can be widely used in the printing industry, from the text printing to the traditional printing environment, its reliability, simplicity, and low operating costs, will be the printing plant to use this technology advantages. A wide range of applications, such as: very high printing speed, a wide range of printable materials, a simple mechanical structure, high durability and stability. Unlike early printing technologies, electromagnetism printing technology promises a lot of room for growth in the future. The current press can print 800 pages per minute and it can print 1,400 pages in the future. And now we are engaged in multi-color printing and new high-resolution research, I believe that in the 21st century, this kind of printing method will become the leading position in the printing industry, and it will complete various high-speed printing operations on different materials. 
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