Explore ink knowledge: How to solve ink flow problems in printing?

Ink fluidity is a common challenge in the printing process. The fluidity of the ink refers to its diffusion ability on the surface of the printing material, poor fluidity will lead to ink penetration on the paper, uneven diffusion, volatilization and other problems, affecting the quality of printed matter. When solving the problem of ink fluidity, it can be explored and practiced from many aspects such as adjusting ink formula, optimizing printing process and improving media conditions.

First of all, the formula of the ink is one of the key factors affecting the fluidity. The main components of ink are resin, pigment, solvent and auxiliaries. By adjusting the proportion and nature of the various components in the ink formula, the fluidity of the ink can be changed. Generally speaking, increasing the resin content can improve the viscosity and fluidity of the ink, but it will increase the drying time of the ink; Increasing the proportion of solvent can reduce the viscosity of ink and improve the fluidity, but it may also cause the ink to volatilize too fast; Adding additives can adjust the rheological properties of the ink to make it more suitable for the printing process. In practice, a combination of formulas can be found by constantly adjusting the formula and testing its fluidity.

Secondly, the optimization of the printing process can also solve the problem of ink fluidity. All aspects of the printing process, such as inking, printing pressure, speed and temperature, will affect the fluidity of the ink. In the inking process, the hardness of the inking roll, the contact area between the inking roll and the plate can be adjusted, and the speed and pressure of the inking roll can be controlled to achieve a better inking effect. At the same time, the printing speed and temperature also need to be reasonably adjusted according to the fluidity of the ink, too fast speed and too high temperature will make the ink flow too fast, and too slow speed and too low temperature will make the ink flow is not smooth, affecting the printing quality. Therefore, by constantly adjusting the printing process parameters, the fluidity of the ink can be optimized.

At the same time, improving the media conditions is also a way to solve the problem of ink fluidity. The absorbency and surface smoothness of the paper will affect the permeability and diffusion of the ink. Paper absorption is too strong will lead to excessive ink diffusion, ink layer dull; If the paper is too smooth, it will make it difficult for the ink to adhere to the surface of the paper, affecting the printing effect. Therefore, choosing the appropriate paper type and surface treatment method can improve the fluidity of ink. In addition, the ink selection should also pay attention to the surface tension and wettability of the ink, in order to improve the wetting ability of the ink on the surface of the paper, so that it is better attached to the paper.

Finally, the use of advanced scientific and technological means is also an important way to solve the problem of ink fluidity. The rheological test and other scientific means can be used to study the rheology and diffusivity of ink in detail, and evaluate the fluidity of ink quickly and accurately. These test results can provide scientific basis for optimizing ink formulation and printing process.

In summary, to solve the problem of ink fluidity, it is necessary to adjust the ink formula, optimize the printing process and improve the media conditions. Through continuous practice and exploration, combined with advanced scientific and technological means, solutions can be found to improve the quality of printed matter.