Many factors in the ink, such as pigment, viscosity, viscosity, and resin, are related to dot expansion. The strength of the ink plays an important role in the expansion of the dot. The ink is squeezed by the printing plate and the blanket, and then by the squeeze between the blanket and the paper. The ink layer formed after two squeezes is usually very thin. The color intensity of the ink depends in part on the pigment in the ink. Pigments are often the largest part of the cost of chemical conversion in inks. However, reducing pigments also reduces ink tinting power. Conversely, if the ink layer is thick during printing, the problem of dot expansion will occur. The ink has high coloring power, and the printed ink layer is thin, so that the desired ideal color can be obtained.
In the expansion of control dots, the adhesion of ink is also very important. The higher the viscosity of the ink, the smaller the dot expansion. However, if the viscosity of the ink is too high, and the degree exceeds the strength of the paper, the paper will "fluff", and even severely tear the paper. Of course, temperature and water also affect viscosity. When the temperature is low, the viscosity of the ink is high, and the degree of dot expansion is low; when the temperature is high, the viscosity of the ink is low, and the degree of dot expansion is high.
In the printing process, the viscosity of the ink will change with the temperature. In lithography, the feed rate of water has an effect on ink viscosity and dot expansion. After the ink absorbs moisture in the printing process, the viscosity will decrease and the viscosity will decrease, thus affecting the expansion of the dot. Too much water will reduce the viscosity of the ink and increase the degree of dot expansion. Therefore, the problem of overprinting will also occur. Conversely, if there is no water and the viscosity of the ink increases, the paper fluffing problem will occur.
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