Application of the hottest high and new technology

2022-08-20
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Application of high and new technology in silk printing

nowadays, high and new technologies such as computers have been widely used in the printing field, which has promoted the development of the printing industry. Silk printing is no exception. In addition to pre press and post press processing, like other printing methods, it makes full use of high and new technologies such as computers, and constantly absorbs and utilizes new technologies and methods in printing, so as to improve printing quality and printing speed and expand business areas

the digital plate making of silk and the pre press plate making of silk printing have gone through several stages: manual plate making, photographic plate making, laser Phototypesetting and computer direct plate making. The first two are simulated plate making, with the best reproduction of the original image as the standard. The latter two are digital plate making, which requires not only good reproduction of the original, but also creative new images. The application of digital plate making provides good conditions for silk printing to improve printing quality and print high-precision products. In digital plate making, there are mainly indirect plate making with output film (film) and computer direct plate making system without direct imaging of output film on the surface of printing plate

indirect digital plate making, which is a digital plate making method in which the computer interprets and processes the electronic information of the original and outputs the film by the output device. According to the material of the film, it can be divided into silver salt film plate making and silver salt free film plate making. The plate making of silver salt containing film uses the same silver salt film as photographic plate making, and the output film also needs to be dug down in the darkroom (2) dig a hole in the installation position of the experimental machine, and use the film processor to obtain the printable film through the processes of development, fixing, washing, drying, etc., and then attach it to the silk to print, develop, and make a printing plate. The representative of this method is laser Phototypesetting plate making, which belongs to the earliest developed and most widely used digital plate making method. The resolution of the imagesetter has reached more than 2400dpi, which makes the quality of plate making in terms of image resolution, clarity, speed and so on have been greatly improved compared with photographic plate making. However, the output is also silver salt containing film, and the development requires chemicals, so there is a certain pollution to the environment

the output mode of non silver salt film is a digital plate making mode developed in recent years, which uses micro piezoelectric technology to make the ink head eject small ink droplets, and directly spray them on the surface of polyester film coated with ink layer, so as to "image by physical method". The film used does not contain silver salt and does not need any processing in the darkroom to realize "what you see is what you get", and the output result is the result, which is called "green environmental protection plate in the true sense". It can achieve 100% transmission, and can effectively avoid underexposure, overexposure, underdevelopment, overdevelopment and other plate making technical problems. Compared with the plate making method of outputting silver salt film, the process is less, and the input of the whole system is only 1//10 of the laser phototypesetting system that can output the same format. A large format inkjet printer with a resolution of 720x1440dpi and an ink drop size of PL (equivalent to 1//5 of the diameter of hair). The image resolution is 133 lines/inch, which can fully meet the requirements of printing plate making for color silk printing

computer direct imaging plate making (CTP), the production of color separation plate of traditional color silk printing, cannot be separated from photosensitive film, especially in super large-scale printing, film mosaic, magnifying film or printing plate are used. No matter which method, it must be based on the premise of producing high-precision and high-line film. It is not only expensive, but also difficult to ensure the quality of splicing. Magnifying film and printing plate are restricted by objective factors such as image distance and lens sphere, which brings a lot of trouble to the actual production, and the quality of plate is difficult to control. In the printing with plate silk, the projection exposure of photosensitive emulsion silk plate is a new technology gradually applied in recent years

with the successful application of computer direct plate making technology in other printing fields, it has also had a far-reaching impact on silk printing. At the end of the 20th century, with the continuous maturity of digital processing technology, computer film free direct plate making (CTS, also known as digital direct plate making) came into being. Direct digital imaging uses the existing precision computer technology to control the wax spraying system and scan the silk plate with a modulated scanning head. First, the computer carries out the layout hanging and rasterization processing, and then the layout information is lattice. Through various imaging technologies such as laser, inkjet, wax spray, etc., the lattice is directly copied to silver plate, polyester film, silk and other plates. As a high-tech application in silk printing, direct digital imaging is a revolution in printing technology

computer direct imaging plate making is the technology that the screen printing plate does not need to be coated with photosensitive glue, that is, a coating is sprayed directly by the computer, and the image is formed on the template, and then the plate can be obtained by printing and developing. The angle of the printing plate point, the thickness of the sprayed material, the density, the exposure time, etc. are all set by the computer. According to the scanning image of the original image, the impact toughness experiment often used in China is to use a U-shaped notched square test bar, place it on the support, and then use the pendulum to drop it for one punching line to directly scan the plate making, and then use water to wash away the unreacted chemical materials to make the printing plate. This plate making method of direct imaging on the template is the development direction of screen printing in the future

in addition, there is another method of direct imaging plate making, which is to directly use a computer to carry out laser scanning and etching imaging on a special metal alloy film. The template made by this method has the characteristics of no deformation, alignment and high printing accuracy. Its application makes it a history that only low line number products can be printed. Compared with projection plate making, direct digital imaging plate making has many advantages. It is more advanced in technology. It can be made into a printing plate in one step without silver salt film at all, thus avoiding the environmental pollution caused by the development of chemical agents. The data of computer-aided design can be directly transmitted to the template without intermediate photography steps, which makes the image clearer and easier to control. Using computer to make plate directly has the characteristics of simple and fast plate making, preventing pollution and improving the quality of plate making and printing. It is the latest plate making method of photosensitive silk screen printing. Its emergence and application have brought fundamental changes to the traditional silk screen printing plate making process, marking that the silk plate making technology has entered a new stage of digitization

this new technology of directly forming printable plates by computer processing can only process black-and-white files due to the limitations of technology and equipment in the early stage. Compared with the computer laser Phototypesetting Technology in the same period, its application scope is relatively narrow. However, with the development and maturity of computer and laser imaging system, by 1995, color CTP technology can directly digital image on aluminum plate, film, silk and other materials, which further promoted the adoption of CTP plate making technology in silk printing. CTP plate making technology greatly simplifies the whole process flow. Now, silk screen printing products can be obtained only through picture and text typesetting and plate making and printing. Compared with the traditional printing process, it omits the processes of photo typesetting output film (including film development, fixing, cleaning, drying, etc.) and plate printing. It has the advantages of speed, accuracy, stability, strong repeatability, simplicity, and The advantages of easy quality control and no need for film

due to the obvious advantages of CTP plate making technology, it has attracted the attention of the silk printing industry and produced a variety of CTP plate making systems. Among these plate making systems, the representative is the jetscreen wax spraying direct plate making system of Luscher company in Switzerland, which has comprehensively reformed the silk plate making technology and directly formed a light blocking wax black ink image layer acting as a mask on the photosensitive glue by spraying. After the full version is exposed, the waxy black ink image and the non photosensitive photosensitive adhesive layer are removed by hot water washing, and a high-quality image with a format of 3mx8m, a resolution of 75 lines/inch and a repetition accuracy of 0.02mm can be made. Then use the plate printer to print the image directly on the plate coated with photosensitive glue to form a set of fully functional color separation template making system. The system does not need to produce film and vacuum adsorption plate printing in the process of plate making. In addition, it can also eliminate sand holes formed by glass scratches or dust, and completely avoid moire caused by points colliding with yarn. Its printing resolution is 630dpi, and the plate resolution accuracy (repetition accuracy) is 0.02mm. The jettscreen plate making system brings the color screen printing plate making process into a new era, and solves the design and production problems of large format plates that were difficult to achieve in the past

silk combination printing technology, in recent years, the development of combination printing is very fast. Several different printing and processing methods can be combined arbitrarily on one printing machine, which makes the products that can be completed only by printing and processing on multiple machines can be completed at one time. Practice has proved that combined printing can not only complement each other's advantages, but also create new printing effects and expand the scope of printing, as people expected. Because silk printing can make up for some shortcomings of other printing, improve the printing quality, and add decoration and art to other printing materials, it requires operators to carefully remove dust and clean the equipment, so that the printing materials are unique, so it also has a wide application prospect in combination printing

at present, silk printing is mainly combined with flexographic printing, which is applied to the following situations:

▲ enhance the attractiveness of products, adopt air permeability effect design, and need to use very thick colors or luminous inks,

▲ some labels used in harsh environments, such as battery labels, paint labels, etc.

▲ products that emphasize product brand and identification, such as drug description labels, injection agents, etc

▲ some ingredients need to warn users according to the law, including the blind,

▲ to obtain metal effects such as gold and silver,

▲ simple and exquisite decoration effects, such as using silk printing to print large areas of field and anti white words, instead of printing fine words

▲ show embossing and sanding effects on cigarette packs or cosmetic packages

▲ printing scraping awards, various lottery tickets and other securities

▲ improve the anti-counterfeiting function of valuable tickets and high-end trademarks by using light variable and temperature variable silk ink

in the future, with the continuous development of science and technology, especially the popularization and application of digital printing in the field of printing, combination printing will be combined with digital printing. For example, on the printing pieces with relatively small number of prints, digital printing has long entered the short version printing market, and the ideal technology to become a personalized printing material is also the best attribute technology of this first material, which is worth highlighting, and computer technology is fully applied in combination printing, It will greatly expand the printing market

in a word, in today's environment of rapid development of science and technology, silk printing, like other printing methods, will continue to absorb and apply high-tech, more fully display its own characteristics, strengthen the complementary advantages with other printing technologies, and expand its market prospects. (end)

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