Updated on August 16, 2024
In book printing process, compared with the color sample printing, monochrome sample printing process is much simpler, and requirements for ink will be relatively low. In practice, the printer pointed out that the requirements of monochrome sample printing for ink are not low, and the modulation of ink has a great impact on the quality of monochrome sample printing.
How does the ink affect the monochrome printing quality in book printing? The stronger the polar adsorption of the ink, it will promote the generation of emulsification. The higher the viscosity of the ink, it will increase its cohesion, that is, the viscosity will strengthen the adhesion between ink molecules. Therefore, in monochrome sample printing, in order to strengthen its water resistance, the ink viscosity must be adjusted in the printing process to achieve suitable printing suitability, so as to affect the ink emulsification. When mixing ink, professionals will control the amount properly. Generally, the ink mixing oil will not only dilute the ink, but also increase the fluidity of the ink, reduce the viscosity, weaken the cohesion between molecules, affect the water making ability of the ink and lead to emulsification.
From the pigment properties in the ink, the quality of the pigment used in various inks with different colors is different, which determines the difference of emulsification value. For example, the ink made of carbon ink pigment has low emulsification value and is not easy to emulsify, which is mainly due to the good hydrophobicity of carbon ink. For the ink made of lake pigment, due to the hydrophilicity of physical pigments such as aluminum hydroxide and aluminum barium white, the ink structure is very easy to be damaged in the printing process, and the pigment particles may act as emulsifiers, resulting in ink emulsification.
How does ink affect monochrome printing quality in book printing? As for the influence of auxiliary materials in monochrome sample printing. Auxiliary materials such as desiccant, mucilage and diluent are generally added to the ink. The main component of the desiccant is metal soap, and the residual water-soluble salts have strong moisture absorption and act as a strong emulsifier. Adding a certain amount of drying agent to the ink can accelerate the drying of the oil. However, excessive addition will also have a negative impact, which can lead to ink emulsification and reduce the drying speed of ink.
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