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Brief introduction of electromagnetic printing

brief introduction of electromagnetic printing

electromagnetic printing is the main application technology of nipson printing machine, which was invented by bull company in 1980 and commercialized in 1984. This printing technology consists of an array of small electromagnetic recording heads, which produce a magnetic latent image on the surface of the hard metal drum, and then develop it through magnetic toner. The toner adsorbs ink on the magnetic latent image, which is transferred to the paper under pressure, and then heated and fixed to form a fixed image. This printing technology is a new application technology for the printing industry

I. printing engine

the printing engine is composed of several simple and reliable subsystems. The basic body of the engine is the cylinder, which is made of hard metal, which is very similar to the application of photocopying technology. The other subsystem is similar to other non-contact technologies in function, but its structure is actually very different. The surface structure of the printing cylinder is an electromagnetic hard layer, which is placed on a magnetic soft material, and the magnetic intensity is about 500 oerst

in fact, the mechanical resistance of the roller surface is quite strong, without the use of soft coating, and the life of the roller is more than 15million feet long.

electromagnetic printing can match different image lengths to meet the needs of printing applications, without changing the roller diameter, just increase the speed of the printing engine

the magnetic residual image on the drum can be demagnetized by the elimination rod every time it rotates, so that the drum can continue to receive new magnetic images

II. Recording head

the image recording station contains a set of array electromagnetic recording heads, which are axially parallel to the drum. Its processing process is similar to that of the recording head of the disk drive in the computer, but it is specially designed for the application of electromagnetic printing. The first generation recording head used in the early stage is used for vertical recording, and the coil will not continue to change during operation. In this way, a lower driving current of about 100 - 150 μ a can be used, which can produce higher magnetic efficiency and higher transverse density. It is impossible to use the traditional recording structure. The density of this recording head for flexible packaging enterprises is 240 poles per inch to form 336 poles per square. The development of Electronics makes the recording head of the second generation electromagnetic printer better, that is, in order to exceed the 240dpi currently used, we must consider the use of collective recording components, combined with standard silicon microelectronics and silicon electrochemical precipitation, to make it possible to integrate magnetic and electromagnetic microstructures. The electromagnetic silicon recording head contains an inch square silicon chip. This recording head is a high-density array recording electromagnetic, which is located by the diode matrix on the chip. This new recording head can obtain a recording head with higher printing quality, better stability and higher speed

the function of the electromagnetic recording head is similar to the imaging effect of the reflected beam in the laser copier, the LED in the electron photography, or the ion clamped in the electron beam

III. latent image and imaging

the recording head writes a magnetic point on the drum surface after opening, and each magnetic point forms a permanent magnetic field to form a latent image. The spring experimental machines on the market around the drum surface image are mainly divided into three categories, and the magnetic field is very low (the maximum is about 100 to 200 oersted). However, the magnetic field shows a particularly high sharpness, which is an important factor due to the use of carbon powder imaging

The main advantage of electromagnetic printing is the permanence of images. When the image is generated, many copies can be printed without re recording. In fact, once recorded on the drum, it can be maintained for a long time as there is no magnetic interference. This feature is different from other non-contact printing technologies. When the roller rotates through the developing station, the fine particles of a single group of toner will be adsorbed on the magnetic image, which can reduce many problems of the traditional two groups of toner. If it is necessary to monitor the concentration of toner added to the stretcher at any time. In fact, in the past, it was used to eliminate the problem of single group of toners by using the information system to improve the intelligent level of production, manufacturing and sales process. After image development, use a vacuum knife or trim the pinhole to remove it. In this way, excess toner can be removed and a sharper image can be formed

IV. image transfer

image transfer depends on 60% mechanical pressure and 40% electrostatic power. The transfer effect caused by this is about%. The use of electrostatic power has a considerable relationship with air humidity in some aspects. If you want to get an ideal transfer, the surface of the printed material cannot have too high humidity. If the toner resistance value is about 103 w/cm, the charging voltage of the conductor is 500 - 1000 V, and the selected concentration is 1.1, the resistance value that can be maintained is 1012 w/cm. If the toner is charged first, the resistance value of the paper can be reduced to 1010 w/cm when the selected concentration value is 1.3 and 1.1

v. image fixation

the method of image fixation is the same as that of any dry powder printing technology, but it is high-speed drying. When fixing, you need to use radiant heat or xenon flash to turn the toner into a semi liquid state. In low-speed devices, heating rollers can be used, and in magnetic printers, radiant heat can be used to fix images. In recent years, the advantage of using flash fixing method is that it can significantly reduce the paper surface temperature, but also reduce many problems caused by heat, such as reducing heat consumption, maintenance costs and so on. The next processing unit on the drum is the cleaning station, which is to remove the remaining toner on the drum that has not been transferred to the paper. In fact, a steel roller, a scraper and a vacuum suction device are used to suck the toner into the bottle

the last step is to remove the magnetic image on the drum, that is, using a low-voltage removal rod to replace the bulb and high-voltage precharge weight in the electronic copier can reduce the electric ring discharge wire by 9%

VI. commercial application of electromagnetic printing

electromagnetic printing machine can be widely used in the printing industry. From text printing to traditional printing environment, its reliability, simplicity and low operation cost will be the advantages of printing plants in selecting this technology. It has a wide range of applications, such as very high printing speed, a wide variety of printable materials, simple mechanical structure, and high durability and stability. Unlike the early printing technology, electromagnetic printing can ensure a lot of development space in the future. The current printing machine can print 800 pages per minute and 1400 pages in the future. He is now engaged in research on new technologies of multi-color printing and higher resolution. It is believed that this printing method will become a leader in the printing industry in the 21st century, and complete various high-speed printing operations of changing images on different materials

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