The dot is the basic unit of ink adhesion, and it plays the role of transferring and organizing colors. Dot expansion refers to the gain of the dots printed on the substrate relative to the dots on the dichroic film.
1. The formation of network expansion
1. According to the change of printed outlets:
â‘ Normal expansion. This expansion of printed dots is allowed, that is to say, the dots are normally expanded, the density of dots in the center is high, and the density of edges is low. â‘¡Ghosting outlets. This expansion of printed dots is not allowed. If dot ghosting occurs during printing, it will seriously affect the color rendering of the dots. â‘¢ Expanded outlets without rules. When there is no rule to expand the dots, the printed dots do not have a rule, and the dots expand to the surroundings. At this time, it is prone to paste and dirty plates, which will affect the quality of the printed products. The expansion of outlets does not exceed 15%, 12%, 10%.
2. Classified according to the expanded status of outlets:
①Linear expansion refers to the expansion of the edge of the printed dot in one direction. Originally, the printed dot is square, round, prismatic, and chain. Linear expansion means that the dot expands linearly in a certain direction. ② The printed dots expand to the surroundings, and the enlargement of the dot area is generally proportional to the length of the dot edge. In other words, the dot area is large, and the length of the dot edge also increases. ③ The increase in density is proportional to the area of ​​the printed dots. The density increases and the ink color is larger; the larger the ink color, the larger the dot area.
Second, the expansion of the network has two mechanical and optical situations
1. Mechanical dot expansion: refers to the deformation and expansion of the ink attached to the metal dots after being squeezed by the printing pressure.
2. Optical dot expansion: due to the effect of light reflection, when light reaches the dot surface, surface reflection occurs, and the ink penetrates the edge of the dot in the paper to form a diffuse halo, which forms a hue , The effect is the same as the mechanical dot expansion during printing.
The expansion of these two types of dots will damage the printed matter to varying degrees and disrupt the balance of the picture. To make the dots truly restore on the printed matter, it is necessary to control the transfer process of the dots (ie, printing plate-blanket-substrate).
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