Analysis of the relationship between screen printing ink and solvent, the relationship between solvent solubility and screen printing

　　1. For printing equipment: adding inappropriate solvents can increase the friction of the equipment and make the printing equipment depreciate faster; at the same time, it may cause frequent shutdowns caused by ink plugging. Start-up operation, accelerate the wear of parts and reduce production efficiency.

　　2. For the ink itself, good dissolving power makes the appearance of the ink have a homogeneous texture, so that the ink has a stable viscosity and fluidity, and is not easy to gel. Adding appropriate co-solvents can fully obtain the effect of dilution and dispersion.

　　3. Solvents commonly used in screen printing inks are roughly divided into ketones, alcohols, benzene, esters, alkanes, and five categories. The main function of the solvent is to dissolve the resin and dilute the ink. Appropriate solvents should be carefully selected for various inks. For example, in the PVC system, ketones can be dissolved, benzene slightly swells, and alcohol gels. Attention must be paid to the selection.

　　4. The relationship with the printing ink film: The choice of solvent must fully consider the gloss, flatness, residual, fastness, ductility and adhesion of the printing ink film.

　　5. Solubility of the co-solvent: The function of the co-solvent is similar to that of the main solvent, so it is necessary to choose the correct co-solvent so that the ink will not gel, lose fluidity and viscosity.

　　6. The relationship between the use of solvent and air humidity: If you use fast-drying solvent with ink for printing, when the temperature is above 90%, a large amount of moisture in the air will be absorbed due to the rapid evaporation of the solvent, resulting in poor ink fluidity and loss of printed matter. Gloss and adhesion deteriorated.

　　7. The original specification and purity of the solvent (percentage): The original specification and purity of the solvent directly affect the degree of solubility and dilution of the ink. If it is not the original solvent, it may contain a small amount of water or impurities, which will greatly affect the quality of the printed matter.

　　8. The volatilization speed of the solvent directly affects the drying speed of the ink. Due to the rapid development of printing technology and printing speed, the appropriate solvent should be carefully selected, otherwise the printing operation will be greatly affected, resulting in the phenomenon that the ink dries too fast, and it is easy to stick back.