Offset printing is the main way of Jinan album printing. Most of the mainstream printing machines used are Heidelberg, Roland, Xiaosen, Mitsubishi, etc. with high intelligence, as long as the operators are familiar with the printing machine in the operation process, the setting of printing process parameters, and basically understand the internal structure of the printing machine, they can print a good product. Generally speaking, it mainly controls ink balance, printing pressure and printing speed.
The printing pressure is too small, the ink is not easy to transfer, and the ink is light and weak; the printing pressure is too large, and the ink expands the non graphic part, so that the dot dot increases seriously, the image is distorted, and it is easy to make the printing plate and the blanket produce the printing resistance. Therefore, the mechanical pressure must be adjusted correctly. Different quantitative paper needs different printing pressure. Only the appropriate printing pressure can ensure the ink is uniform and the thickness is the same.
Printing speed is too fast, easy to cause depilation, depilation and other phenomena. The comprehensive factors such as the performance of substrate, the size of substrate and the viscosity of ink should be considered. Printing format, thickness, substrate surface strength is low, printing speed is slightly slow; the higher the viscosity of ink, the slower the printing speed. Printing speed determines to achieve the complete reproduction of text and the highest production efficiency.
Ink balance is a relative balance, not an absolute balance in the operation of high-speed equipment. According to the actual situation, master the viscosity of ink and the pH value of the fountain solution, and control whether the ink and water are dirty on the plate paste.
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