The future of gravure printing and printing is beautiful
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1960s. Gravure plate making technology has entered the stage of research and development and production of high precision equipment. Prior to this, corrosion-based plate making using chemical agents was used. 1. In 962, HELL was involved in the gravure prepress field. The first gravure electronic engraving machine using analog electronic technology was produced. In the mid-1970s. Digital electronic engraving technology was introduced in the early B0s. Gravure platemaking uses an electronic computer control mode; early 90s. Gravure plate making realizes computer direct plate making technology: 997 years. Gravure enables an open workflow 1998. Gravure plate printing achieved high speed engraving (8000HZ) in 2001. The laser directly engraved zinc roller was introduced; 2003. Superfine electronic engraving technology is available; 2004. 12800Hz ultra-high speed engraving technology is available.
Classification of gravure plate technology
Gravure plate making can be divided into three types: 1 manual corrosion plate making. Including carbon quality corrosion plate making method and Bran corrosion plate making method. 2 Electronic engraving method. 3 laser plate making method. Including laser exposure etching, laser etch and laser direct engraving.
1. Manual corrosion plate making
The manual etching method is to grind the flat copper plate with hard charcoal. The plate was slightly baked on a charcoal fire. Rub the yellow wax. Brush evenly with a soft brush. Wait for a few hours in the shade. 1. First, hook the cellophane with a needle knife. When the hook is drawn, the paper is half-layered. Fill the texture of the paper with red powder. Then cover the paper on the page. Rubbing on the back of the paper. Put it on the fire and bake it a little. The red powder is all stuck. Then cool for a moment. Engraved with a knife. Remove the wax from the red powder. Move the knife slowly. After that, put the plate in the flat. Irrigation copper syrup. After an hour or two, the copper is deeply corroded. Wash the potion. Wipe off the yellow wax. It can be printed.
2. Electronic engraving
Compared to embossed, offset and flexo plate imaging. The electronic engraving gravure process is much simpler. The value corresponding to the gray value of the original image can be directly transmitted to the electronic engraving machine. Control the diamond carving needle to engrave on the surface of the copper layer. The area and depth of the engraved cells can be changed. Electronic Engraving A high-quality gravure cylinder suitable for specific printing conditions (including presses, inks, paper, etc.) can be obtained by simply adjusting the tone curve.
Using the gray value data to control the electro-engraving needle can achieve accurate matching with the gravure mesh image. Greatly improve the reliability of the process and the quality of the plate cylinder.
Different from offset printing. In copying text and lines. The electronic engraving method cannot achieve a finer copy than the number of selected engraving lines. The quality of copying of text and lines is limited. In this regard. HELL has improved the dynamic control of the electric engraving needle. Developed HQH software. Effectively eliminates the "zig-shaped edges" of small yin and yang lines. usually. Gravure text is softer than offset printing.
Electronic engraving is widely used due to its simple process, high reliability, low cost, good quality, and especially good image reproducibility. Compared with corrosion plate making. The only drawback to electronic engraving is the poor profile. In the field of packaging and printing, in addition to electronic engraving gravure. The application of corrosive plates is also common. That is to say, laser-etched digital imaging is used instead of traditional film imaging, and the depth of the cell is still not controlled during imaging, which limits the copying of the mesh product to a certain extent.
In view of this situation. HELL aims to solve the problem of contour definition of text and lines for electronic engraving. This goal was achieved through the development of electronic engraving gravure technology and laser direct engraving of copper layers.
3. Laser plate making
Engraved with short-wavelength laser pulses, the tone is not soft or delicate. Direct engraving on the metal layer also involves the sensitivity of the metal layer to the laser. Small changes in the sensitivity of the metal to the laser beam have an effect on the energy threshold. Since only the energy in the pulse above the threshold can generate a cell, the change in the energy threshold affects the cell size. If the energy density of the laser beam is fluctuated, it will also cause the change of the size of the cell. The above two static changes will cause the cell size deviation. If this change happens at the same time. Will definitely lead to greater deviations. Because the laser beam is focused through the glass lens. Only one fixed imaging zone can be provided for the device domain of the shaftless drive technology of the gravure printing press. This allows the laser beam to have only a fixed diameter. One way to increase the engraving stability and improve the resolution of the zinc layer is to form a grid with several small cells. The resulting hexagonal grid accommodates seven relatively small independent cells, but this method greatly reduces the engraving speed.
Other plate-making techniques include traditional gravure plate-making technology and direct photo-screening technology.
Gravure plate making technology and market development highlights
1. Gravure plate making technology
1 Superfine engraving technology uses different resolutions for text and images. The reproduction of text and lines is achieved with very high precision.
2 The birth of laser direct plate making technology makes gravure printing easier, more random, and more efficient to create high-definition edge effects (especially for small text), and at the same time does not require chemically controlled processes that are not easily controlled by humans.
3 The speed of electro-engraving machine and the stable control in drum preparation, process flow and digital proofing greatly shorten the cycle of electro-engraving. This also makes gravure printing more competitive.
4 The birth of multi-channel engraving technology makes the gravure plate making technology more reliable and timely. And more competitive price advantage.
5 Gravure environmentally friendly water-based inks and online online processing (die cutting, bronzing, etc.) make gravure printing more competitive in packaging and printing. For these reasons. Since 2020, the global gravure market share has rebounded and increased.
2. New highlights in the gravure platemaking market
1 fully automated
The entire plate making process is automatically adjusted, automatically managed, and automatically monitored.
2 plate making business diversification
At the same time as the main business, the gravure plate also developed the decorative field, such as the width of the drum can reach 2.1 meters. Special scanning technology 6-5 scanning technology.
3 plate making process digitization
Digitization of the platemaking process: full digital linking and management between production design and customers.
Because the customers facing gravure are world-class large companies. Then the plate-making enterprises and printing companies that serve the development of globalization must also achieve globalization. In order to better serve its customers.
Conclusion
Due to the long period of gravure plate making. And ask for timely supply. Therefore, the service distance of gravure printing plate generally does not exceed 200 to 300 kilometers. Only so. In order to ensure a more timely and comprehensive service to customers. New technology and new development proof and foreboding gravure and printing will have a bright future!