In the FPD industry, what is the current state of printing technology for liquid crystals and plasmas? There are many printing technologies in the industry, especially the newly developed printing technology, which is briefly introduced here.
STN began to use alignment film related technology, after which this technology was widely used. Atmospheric thick film printing is now beginning to appear after the application of the alignment film. This technology has been progressing especially in Europe and is now widely used. With regard to gravure offset printing, it uses metal inks, that is, direct pattern printing on glass. For example, a 65-inch PDP, which can be printed directly on a glass substrate, is now coming. In addition, there are C/F pixel resist pattern printing, dot-drawing straight-forward printing and the like. There are many kinds of technologies in the field of inkjet printing devices, and now also began to make metal ink printing, ITO printing, etc., and the way of inkjet is also becoming more and more diverse. There is also a laser punching direct printing device. Now at NAKAN, the polymer multilayer film surface pattern generation technology is used, which is the final pattern printing on the surface. This technology is now a relatively advanced technology.
About flexographic printing
Flexographic printing technology has five methods: gravure, flexo, offset, screen, and typography. Among them, typography is mainly in the publishing field and cannot be applied in the FPD industry. The Other four methods have been widely used in the FPD industry. Applications.
Gravure: A type of gravure printing that uses solvent-evaporating inks for excellent blending and shade. The freedom of ink selection is large. It has the characteristics of good printing effect and large freedom of choice of ink.
Flexographic printing: A type of letterpress printing in which a rubber or a photosensitive resin is used. The printing pressure is small; the fluidity of the ink is good; the solvent drying is slightly slow, and the oil black of the volatile solvent is used. It has the feature of being able to perform homogeneous film-forming printing on a thin printed matter, but the fine characters are easily damaged.
Offset printing: used for paper printing, especially for printing on various platen papers. Since printing is carried out between ink rolls, the ink needs to have fluidity and mobility; the solvent used is slightly slower to penetrate the tape; special inks (heat-resistant inks, UV inks) can be used for printing. Most of the offset printing is sheet-type printing, which is suitable for the characteristics of simple plate making and small batch production.
Screen printing: Solvent evaporation type ink (same as gravure, flexographic printing). Depending on the drying method of the ink, it can be divided into evaporative drying type (evaporation of solvent), impregnated drying type (for paper), oxidative polycondensation type (natural drying after oxidative polycondensation reaction with oxygen in air), reaction polymerization type (mixing) Two types of resin printing, inks that undergo a hardening reaction). The on-line processing technology of printing → platen paper is more advanced (saving labor, low cost), using light-weight pigments, will not damage the mesh of mesh.
As we all know, printing technology in FPD industry mainly has two development directions. First, with the eighth generation, the nine generations and ten generations of factories being continuously built and put into production, the large-scale development of glass substrates is constantly developing. Now the eighth generation Flexographic printing presses have been produced to promote the development of the industry. The second is to increase the utilization rate of equipment. In the field of liquid crystal, NAKAN's printing equipment accounts for 93% of the range from low temperature to high temperature, and its products are loved by countries all over the world.
In China, the factory has been built more and more. It is said that China has 5.5 generations, and this is very suitable for the production of TV sets. China is making full use of the resources around the factory in the construction of factories. In general, the 5.5th and 6th generation lines in China The construction is accelerating and even making significant progress.
With the continuous expansion of the substrate, how should the five-generation and six-generation lines be considered? Be sure to increase the efficiency of your equipment.
Regarding the flexible method, NAKAN has 30 years of development experience, especially in the aspect of alignment film, such as board automation.
The film is constantly thinning, but the quality is kept uniform, and NAKAN has unique technology in this regard.
The part in contact between the film and the liquid crystal, which is the alignment film, which has a junction with the liquid crystal, the uniformity of its mass and the degree of its thinness, the degree of exposure, the brightness of the liquid crystal, and the angle of view, breadth, etc. TV manufacturers are very important content, and NAKAN is working day and night to improve these technologies. Recently, there is a saying that rather than reducing costs, it is better to further improve quality and reduce the rate of defective products. Now that technology is constantly evolving, it can be said that the scrap rate is now less than 1%. So as long as the management is good, the quality can be raised to a very high degree. In the year before, we developed the 7.5-generation equipment, and now the equipment is bigger, it corresponds to the production needs of more than 8 generations. By 2007, the panel has surpassed the 8th generation line, and NAKAN has now begun to prepare for the 10th generation line.
About inkjet printing
The competition in the inkjet field is also very fierce. We are now mainly occupying more than half of the international market in the flexible field.
After the fifth generation, the entire equipment has a weight of about 15 tons, which must be transported to the warehouse with a special truck. The fifth generation of packaging is such a situation; after the sixth generation line, the trailer is full. There is still no gap, so there is a great difficulty in transportation. By the seventh generation or above, we can use special trucks of special companies to transport. It must also have air-conditioning equipment. It will have the same problem in China in the future. .
In the past few years, NAKAN has manufactured 7.5-generation line inkjet equipment at the customer's request. There is inkjet in the printing press, which can be directly put into production when deciding the plant's equipment. There is a famous company in Cambridge, UK. It has introduced a 760 printing unit technology equipment, and its printing film is also Use NAKAN products. At a recent exhibition in the United States, NAKAN showed the latest equipment. This type of inkjet head will not leave the remaining inkjet liquid as before, so that it can be sprayed with new ink. In the field of GDC, this technology There is a great application prospect.
New nozzle printing equipment is now getting smaller and smaller. If it is used on the FPD, it will affect the uniformity of the product, so further technical improvement of the inkjet head is required. Now NAKAN's printing equipment has a feature that prints at high speed with fewer nozzles.
About gravure offset printing
Appearing in January this year, gravure offset printing press equipment began to face the tenth generation line, that is, its ground can be placed more than three meters of substrate. So when it comes to gravure offset technology, how is this intaglio printed?
We tested a lot of inks. Nowadays, flexible alignment film printing is like this. Applying a molecular film on the surface of the board, it is produced in this way. After six generations, it is further reduced, and the board has to be fixed. If the board can rotate, plus a gravure offset printing, it can be directly printed. In this way, the gravure pattern printing can be performed. Therefore, NAKAN company develops under the same concept whether it is flexible printing or gravure printing. And it has also achieved success.
There is also a gravure printing feature. When gravure offset printing is different from the others, the two colors can be combined with printing, that is, double-layer printing can be realized through one process, which is not only applicable to the FPD industry, but also can be applied in other printing fields. A very good technique. NAKAN can print CF with offset printing. This process can be performed in the factory without corrosion.
Another point is that gravure printing has a good light transmission because there is no photoreceptor, so the CF required for HDTV can be produced.
This is some of the specific data for gravure printing.
NAKAN originally did not produce gravure offset printing. We have been producing related equipment for the past 18 years. By the beginning of 2006, gravure printing will be introduced to the market.
About laser drilling direct printing
Finally, the method of laser drilling is introduced. To uniformly control the light, make the light into a beam, make a mask in the beam, and then process the mask with a laser.
The ITO film can be made very fine and very beautiful by laser. Lasers can be used to make different patterns according to customer requirements. When the ITO film is applied, the laser can be directly cut by the laser without the etching process, so that the process can be reduced by one. Laser forming technology is also becoming more and more mature.
After nearly 50 years of development, NAKAN has gone through the stage of technology development and entered the application stage. Make industrial technology more mature. In general, the precision of the printing machine can be 10, and the flexographic printing method can reach 5 or even 3, and the precision is continuously improved. In this process, gravure offset printing can be realized, laser drilling can be realized, it can be said that the technology is still mature and perfect, NAKAN company has long been committed to developing the best printing technology, and its products are also liked by customers.
(Assistant editor: xiaohu)
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