The difference between digital flexo and ordinary flexo
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1. During the exposure process, the scattering and diffuse reflection of light are different. When the ordinary flexographic printing plate is exposed, the ultraviolet rays pass through the vacuum layer, the film base, the emulsion layer and the antihalation layer, and the total thickness thereof is large, and there is a serious scattering and Diffuse problem. When the digital flexographic printing plate is exposed, the light passes through only a layer of black coating of less than 0.001 in., and there is only weak scattering and diffuse reflection.
2. The exposure environment is different, the ordinary plate is exposed under vacuum, and the digital plate is exposed in the air. The photopolymerization type photoreceptor has different photopolymerization mechanism in air and in vacuum, which results in dot dot shape, exposure latitude, and other properties of the printing plate.
3. The dot shape is different, the dot reproduction range is large, the convex dot on the ordinary flexo plate has a circular cross section, the longitudinal section is trapezoidal, and the top of the dot is flat, and the raised dot on the digital flexo plate is small and inclined. The degree is small, the tip of the point is round, but not flat. The edge of the dot of the digital flexo is sleek. The outline of the dot on the ordinary flexo plate is clear. Clearly defined dots are easy to break when printed, and dots on digital flexo plates, especially highlights, are less likely to occur, so print quality is good.
4. The exposure latitude is different, and the black coating on the digital flexo plate greatly improves the latitude of the UV main exposure. Experiments show that the digital flexo printing master exposure time is increased by 5 to 10 minutes, which has no effect on the convex height of the image portion on the printing plate, while the ordinary flexographic printing plate is different. As long as the exposure time is slightly increased, the image will be convex. The height of the rise is significantly reduced. Exposure latitude is great for the perfect shape of the dot.
Since the digital flexo plate has a certain degree of exposure latitude, it is not necessary to pay special attention to highlights and dark points during exposure, and it can also ensure that the highlight points are not lost, and the dark spots are not sticky. It is recommended to set the main exposure time of the digital flexo plate to 10 min, which is enough to ensure that the highlight point is not lost. When making an ordinary flexo plate, the exposure time must be strictly controlled. It is necessary to pay attention to the fact that the highlight point is not lost, and the dark tone is not considered.