Offset dot enlargement and its classification and production

Offset dot enlargement and its classification and production

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The dot is the basic unit of ink adhesion, which plays the role of transfer and tissue color. Dot enlargement refers to the gain of the dots printed on the substrate relative to the dots on the color separation sheet.

First, the formation of outlet expansion

1. Classified according to printed outlet changes:

1 Normal expansion. This printing dot gain is allowed, that is to say, the dot is normally enlarged, the dot density of the dot is high, and the edge density is low. 2 ghosting outlets. This kind of printing dot enlargement is not allowed. If there is dot ghosting during printing, it will seriously affect the coloring effect of the dot. 3 There is no rule to expand the outlets. When there is no rule-wide dot expansion, there is no rule for the printed dot, and the dot is enlarged to the periphery. At this time, the paste and the dirty plate are prone to be affected, which may affect the quality of the printed product. The expansion of outlets does not exceed 15%, 12%, and 10%.

2. Classified according to the state of network expansion:

1 Linear expansion means that the edge of the printing dot has a direction expansion. The original printing dot is square, round, prismatic, and chain-shaped. The linear expansion means that the dot is linearly expanded toward a certain aspect. 2 The printed dots are enlarged to the periphery, and the enlargement of the dot area is generally proportional to the length of the edge of the dot. That is to say, the area of the dot is large, and the length of the edge of the dot is also increased. 3 The increase in density is proportional to the area of the printed dot, the density is increased, the ink color is large; the ink color is large, and the dot area is large.

Second, the expansion of outlets has both mechanical and optical conditions.

1. Mechanical dot enlargement: The ink attached to the metal plate dot is deformed and expanded by the pressing of the printing pressure.

2. Optical dot enlargement: Due to the reflection of light, when the light reaches the surface of the dot, surface reflection occurs, and the ink penetrates into the edge of the dot in the paper to form a diffuse vignette, which forms a hue. The effect is the same as the mechanical dot enlargement during printing.

The expansion of these two outlets has damaged prints to varying degrees, destroying the balance of the picture. In order to make the dots actually restore on the printed matter, it is necessary to control the transfer process of the dots (ie, printing plate - blanket - substrate).