The printing machine is mainly composed of four parts: the frame, the vacuum pumping system, the lamps and the electric control system; the original light source of the plate-printing machine is mainly a high-pressure mercury lamp, a xenon lamp and a xenon lamp. This article focuses on the characteristics and working principle of the printing machine.
Printing machine features:
1. Use a hard metal photographic plate;
2. Use a high-power cold color light source to operate under a bright room;
3. The original and the photosensitive material are closely attached to the original large image.
The working principle of the printing machine:
The film and the PS plate are closely attached and exposed to ultraviolet light. There are two main reasons for the quality of the sounding version: vacuum, the closeness of the film and the PS version. The source of light, the wavelength of the ultraviolet light is within a certain range, as much as possible "pure". The closeness of the original (such as film) and PS version fit. At present, China's industry standard is: in the working process, the printing plate should maintain complete contact with the glass surface, the vacuum system should be able to obtain a vacuum of 80 kPa within 60s, and the vacuum should not decrease during the working period. The most important indicator for measuring the quality of a plate machine. The domestic industry standard JB/T9108-1999 is: the uniformity of illumination on the working surface shall not be less than 86%.
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