Electromagnetic printing is the main application technology of Nipson printing presses. It was invented by Bull Company in 1980 and commercialized in 1984. This printing technology consists of a set of small electromagnetic recording heads that produce a magnetic latent image on the surface of a hard metal cylinder, which is then developed through magnetic toner. The toner absorbs ink on the magnetic latent image and is pressurized. After being transferred to the paper, it is heated and fixed to form a fixed image. This printing technique is a new application technology for the printing industry.
1. Printing Engine
The printing engine is composed of several simple and reliable subsystems. The basic body of the engine is a cylinder, which is made of hard metal, which is very similar to the application of photocopying technology. The other subsystem is similar in function to other non-contact technologies, but in fact its structure is very different. The surface structure of the printing cylinder is a hard layer that can be electromagnetically placed on the magnetically soft material with a magnetic strength of about 500 oerst.
In fact, the mechanical resistance of the surface of the cylinder is quite strong, and no soft coating is used. The life of the cylinder is more than 15 million feet long. Electromagnetic printing can match different image lengths to meet the needs of printing applications without changing the cylinder Diameter, just increase the speed of the printing engine.
The magnetic afterimage on the drum can be demagnetized by the erasing bar every time it rotates, so that the drum can continue to receive new magnetic images.
Second, the recording head
The image recording station contains an array of electromagnetic recording heads, which are axially parallel to the drum. The processing process is similar to the recording head of the disk drive in the computer. It is specially designed for electromagnetic printing applications. The first-generation recording and writing heads used in the early days were used for vertical recording, and the coils did not change during operation, so the lower drive current can be used in the range of 100-150 microamps, which can produce higher magnetic efficiency, and Can make the lateral density higher. If the traditional recording and writing structure is used, it is impossible. The density of this recording head is 240 poles per inch to form 336 poles per square. The development of electronics makes the recording head of the second generation electromagnetic printing machine better, that is, in order to exceed the 240dpi currently used, you must consider the use of collective recording components, combined with standard silicon micro-electric processing and silicon electrochemical precipitation, so that It becomes possible with electromagnetic microstructure. The electromagnetic silicon recording head contains a piece of English technology? Tomb tomb wine ?? Temple clip to give lungs? Xie Fengren? Cha clip blown cow cattle? Still wine? Department of mu ???? Jia Ci Fang Li Xun Enzyme? Lao ≈ Breaking the Province ⑽ Inquiry? Wish? Yan Peng Yuque? Bang Mu Jia Ci II? / P>
The function of the electromagnetic recording head is similar to the imaging effect of the reflected light beam in the laser copier, the light emitting diode in electrophotography, or the ion card sandwiched in the electron beam.
3. Latent and imaging
After the recording head is turned on, a magnetic spot is written on the surface of the drum. Each magnetic spot forms a permanent magnetic field to form a latent image. The external magnetic field around the image on the surface of the drum is very low (maximum about 100 to 200 oersted), however The magnetic field shows a particularly high degree of sharpness, and the important factor is due to the use of toner imaging.
The main advantage of electromagnetic printing is the permanence of the image. After the image is generated, many copies can be printed without re-recording. In fact, once recorded on the cylinder, as long as there is no magnetic interference, it can be maintained for a long time. different places. When the roller rotates past the developing station, the single group of toner fine particles will be adsorbed on the magnetic image, which can reduce many problems of the traditional two-group toner. In fact, in the past, to eliminate the single-group toner problem, after the image was developed, use a vacuum knife or trim the pinhole to remove it, so that excess toner can be removed, and a sharper image can be formed.
4. Image transfer
The transfer of images depends on 60% of mechanical pressure and 40% of static electricity, so the transfer effect caused by this is about 80-85%. The use of electrostatic power has a certain relationship with the air humidity in some aspects. If you want to get the ideal transfer, the surface of the printed material must not have too high humidity. If the toner resistance value is about 103 W / cm, and the electrical conductor is charged The voltage is 500-1000 V, the selected concentration is 1.1, and the resistance value can be maintained at 1012 W / cm. If the toner is charged first, when the selected density value is 1.3 and 1.1, the resistance value of the paper can be reduced to 1010 W / cm.
Fifth, the image is fixed
The method of image fixing is the same as that of any dry powder printing technology, except that it is drying at high speed. Radiation heat or xenon flash lamps are required to turn the toner into a semi-liquid state when fixing. In low-speed devices, heating rollers can be used, and in magnetic printers, radiant heat is used to fix the image. In recent years, the flash fixing method has been cited. Its advantage is that it can greatly reduce the temperature of the paper surface, and it can also reduce many problems caused by heat, such as reducing thermal energy consumption and maintenance costs. The next processing unit on the roller is the cleaning station, which removes the remaining toner on the roller that has not been transferred to the paper. In fact, a steel roller, a scraper and a vacuum suction device are used to draw the toner into the bottle.
The last step is to remove the magnetic image on the drum, that is, to use a low-voltage removal rod to replace the light bulb and high-voltage pre-charge ring discharge line in the electronic copier.
6. Commercial Application of Electromagnetic Printing
Electromagnetic printers can be widely used in the printing industry. From text printing to traditional printing environments, their reliability, simplicity, and low operating costs will be the advantages of printing companies choosing this technology. The application range is very wide, such as: very high printing speed, a wide range of printable materials, simple mechanical structure, and high durability and stability. Unlike the early printing technology, electromagnetic printing can guarantee a lot of room for future development. The current printing press can print 800 pages per minute, and the future can print 1,400 pages. And now engaged in multi-color printing and higher resolution new technology research, I believe that in the 21st century, this printing method will become the leading position in the printing industry, complete a variety of high-speed printing operations on different materials to change the print.
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