How to optimize the quality of ink film for book printing
Time:2025-07-22
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The evaporation rate of solvents plays a crucial role in the formation and final quality of ink films during the printing process. Inappropriate evaporation rate can lead to various printing quality issues, therefore, printing technicians must precisely control the evaporation rate of solvents. The following are some common problems that may arise when solvents evaporate too quickly or too slowly:
Problems caused by rapid solvent evaporation:
Increasing ink viscosity: Using a large amount of rapidly volatile solvents (such as butanone, ethyl acetate, toluene, etc.) can significantly increase the viscosity of the ink and reduce its fluidity, which can affect the leveling of the ink film and easily lead to the phenomenon of "orange peel".
Pinhole formation: Due to the rapid evaporation of the solvent, the ink is not fully leveled, resulting in the formation of many tiny pinholes in the ink film.
Whitening of ink film: The evaporation of a large amount of solvent will absorb a large amount of heat, causing the surface temperature of the substrate to rapidly decrease, resulting in the condensation of moisture in the air on the ink film, forming a "whitening" phenomenon.
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Explosion phenomenon: Rapid solvent evaporation can cause the surface of the ink film to solidify rapidly, while the underlying solvent cannot escape smoothly. When the ambient temperature rises, residual solvents may be squeezed out from the inside of the ink film, forming bubbles or bursting holes.
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Problems caused by slow solvent evaporation:
1. Ink film sticking: If a large amount of slowly evaporating solvents are used, the ink drying speed will slow down, causing the ink film to stick and affecting subsequent processing and use.
2. Soft ink film: Insufficient drying of the ink film can cause it to become soft and unstable, affecting the durability and appearance quality of printed materials.
3. Thickening of edges: Slow solvent evaporation may also lead to the accumulation of ink film edges, forming thicker edges and affecting the overall appearance of printed materials.
To solve these problems, printing technicians need to select and mix solvent types and ratios reasonably based on the characteristics of the ink, the type of substrate, and environmental conditions. In addition, the evaporation rate of solvents can be controlled by adjusting the drying system of the printing machine and the temperature and humidity of the printing environment, ensuring the quality of ink film formation and improving the overall quality of printed products.
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