Generally, an appropriate amount of solvent can be added, and the evaporation rate of the solvent directly affects the drying speed of the ink. Adding solvent will make the ink thinner, and the hiding power is not enough or the font is not clear. Ink is generally not dry on the screen, and it starts to dry about ten minutes after passing the screen. This is the standard for screen printing ink. However, the general screen printing ink will not have the problem of fast drying, even if the weather is dry, there will be no obvious plugging phenomenon. Once a similar problem occurs, the main reason is that the ink factory has a formula Let ’s take a look at the close relationship between solvents and screen printing inks Solvent is an indispensable material in screen printing, which has a crucial impact on screen printing production and printing quality. In screen printing, solvents are closely related to screen printing inks, and must be fully paid attention to. Here are some simple explanations. The function of solvent in screen printing (1) Dissolving resin: according to different resins, different solvents are needed to dissolve (polar, non-polar). (2) Liquidity: Similar products produced by different manufacturers have different dissolving power, which directly affects the viscosity of the ink. (3) Glossiness: When the same or different solvents of different volatilization speed are released in the printing ink film, it will cause the fogging and whitening of the ink film, thus affecting the gloss of the printing surface. (4) Drying time: Due to the selection of different printing methods during printing operations, as well as the differences in printing environment, climatic conditions and formulation requirements, the boiling point of the solvent is different to provide an appropriate drying time. (5) Residuality of solvent: some solvents with low affinity to the resin help to increase the opening time of the printing ink film and reduce the residual solvent. Solvent setting of screen printing ink characteristics (1) Solvent: The solvent used to dissolve the resin to stabilize the viscosity in accordance with the basic conditions of ink quality when producing ink. (2) Co-solvent: a solvent that has excellent solubility in the main solvent, but has a weaker solvent power when it exhibits shortcomings under other conditions, and can help solve certain shortcomings. (3) Thinner: It has no dissolving power to the resin of the ink itself, and has the function of dissolving after mixing with the main solvent to reduce the viscosity of the ink. The effect of diluting ink. The relationship between the solubility of the solvent and screen printing (1) For the ink itself, good dissolving power gives the ink a homogeneous appearance, which makes the ink have stable viscosity and fluidity, and is not easy to gel. Adding appropriate co-solvent can fully obtain the effect of dilution and dispersion. (2) For printing equipment: adding inappropriate solvent can cause the friction of the equipment to increase and make the printing equipment depreciate faster; at the same time, it may cause frequent stoppage of the ink plugging plate. Start-up operation, accelerate the wear of parts and reduce production efficiency. (3) Relationship with printing ink film: The choice of solvent must fully consider the gloss, flatness, residualness, fastness, ductility and adhesion of the printing ink film. Considerations for solvent selection (1) The commonly used solvents in screen printing inks are roughly divided into ketones, alcohols, benzene, esters, alkanes, and five types. The main function of the solvent is to dissolve the resin and dilute the ink. Various inks should be carefully selected the appropriate solvent, such as: PVC system, ketone can be dissolved, benzene micro-expansion, alcohol gelatinization, must be careful when selecting. (2) Solubility of co-solvent: The function of the co-solvent is similar to the main solvent, so it is important to select the correct co-solvent so as not to cause the ink to gel, lose fluidity and viscosity. (3) The original specification purity (percentage) of the solvent: the original specification and purity of the solvent directly affect the dissolution and dilution of the ink. If it is not the original solvent, it may contain a small amount of moisture or impurities, which greatly affects the quality of the printed matter, which may cause the printing surface to lose gloss, poor adhesion and plugging. (4) The evaporation rate of the solvent directly affects the drying speed of the ink. Due to the rapid development of printing technology and printing speed, it is necessary to carefully select the appropriate solvent, otherwise it will affect the printing work greatly, causing the ink to dry too quickly and stop the plate too slowly, it is easy to stick back and so on. (5) The dispersibility of the solvent to the color material: the choice of solvent has a close relationship with the dispersion of the pigment contained in the ink. If the wrong solvent is used, the pigment in the ink will also coagulate (reverse coarse) and affect the color strength , So that the color density is reduced, and even normal printing is not possible. (6) Solubility of resin to resin: In actual printing, if the solvent has poor solubility, the resin or ink will solidify and the fluidity will deteriorate. (7) Separation of solvent to color material: In the use of color matching ink, if the wrong solvent is selected, the various colors in the ink will be dispersed inconsistently, resulting in color separation phenomena such as color separation and floating color. (8) When the cosolvent is used, if the dissolving power is too poor, the ink will easily lose its viscosity (poor fluidity), and water ripples, adhesion, and gloss deterioration will easily occur during printing. (9) Cost of solvent drying speed: The evaporation rate of the solvent during printing is too fast, which not only affects the normal progress of printing, but also makes the solvent consume faster and increases the cost. If the solvent dries too slowly, it will slow down the production speed and increase the cost of working hours. (10) Solvent preparation: The proportion of solvent preparation has a great influence on the dissolving power and speed. The proportion of main solvent and co-solvent must be controlled according to the specific needs during preparation, so that the dissolving power and drying speed can be adjusted according to the ink needs. (11) The relationship between the use of solvent and air humidity: if printing with a quick-drying solvent and ink, when the temperature is above 90%, the solvent evaporates too fast and absorbs a large amount of moisture in the air, resulting in poor ink fluidity and printing Loss of gloss and poor adhesion. (12) The appearance of the solvent: If the appearance of the solvent is poor (unclear or colored), it will directly affect the hue of the printed matter and the color variation phenomenon. 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