Principle of laser technology application in printing plate making

Laser is an emerging discipline and high-tech. Since its birth in the early 1960s, it has been valued by all countries and developed rapidly. As a result, the application range of laser has been continuously expanded, and many fields corresponding to it have undergone profound changes. The printing industry around the world, like other industries, is actively adopting this new technology. Lasers are used in electronic plate separation, laser phototypesetting, holographic printing technology, etc., and the printing system is greatly optimized. Due to space limitations, this article only discusses the application of laser in plate making.

The printing plate is an indispensable part of the printing process. It is the medium that transfers the ink to the substrate. The quality of the printing plate is directly related to the quality of the printed product. The printing industry has been working hard to improve the plate making process in order to achieve the most Quickly and best produce the printing plate, while reducing labor intensity and reducing plate-making costs. In the early stage, the production of gravure, relief and offset printing plates mainly relied on manual, mechanical, chemical corrosion, electric power photography technology, etc., but these methods have defects such as lack of operational stability and long plate-making time. These problems have been solved since the birth of the laser. In addition, the high intensity, high coherence, and monochromaticity of the laser can quickly and reliably produce the printing plate.

Laser engraved printing plate is to focus the laser beam on the printing plate, melt the specified range of the printing plate, and then remove the unnecessary parts to produce convex and concave images. The shape, size and size of the image can be electronically modulated control. Generally speaking, when the power density of the laser reaches 10-lOw / cm, the plate-making materials (including ceramics) must be melted or vaporized. After the medium-intensity laser beam is focused by the lens, the power density value obtained at the focal point is far greater Due to the above values, the laser is more suitable for engraving printing plates. Because of its monochromaticity, high energy, good coherence and other characteristics, the laser shows strong advantages in engraving and plate making, especially the development and application of modern purple laser technology, which makes the production of printing plates more perfect. The laser has high intensity, which not only melts and etches non-metallic materials (such as imaging films, photosensitive resin plates and plastic plates, etc.), but also melts metal materials (nickel, lead, steel, chromium and other plates). It can even etch ceramic rollers with a high degree of refractory. Compared with other methods, the etching range is much wider. Laser plate making is fast and of good quality. Generally, the time to engrave a split is about 3min. If the purple laser technology with a shorter wavelength is used, the time will be shorter, and the resolution can be improved to ensure the quality of the dots. Due to its good coherence and concentrated energy, the laser has high engraving efficiency and low total energy consumption. Laser plate making is not perfect, and the problem is that the effect of laser directly engraving metal is not good. Because the laser-etched ink holes are not smooth and have burrs, and the metal surface has a large reflection effect on the laser, only high-power lasers can be used for engraving. The general solution to this problem is to put a resin or plastic sleeve on the outside of the metal drum, and the laser does not engrave directly on the metal plate.

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