Analysis of Relationship between Screen Printing Ink and Solvent (I)

Under normal circumstances, an appropriate amount of solvent can be added. The volatilization rate of the solvent directly affects the drying speed of the ink. Adding a solvent will thin the ink, causing insufficient hiding power or unclear characters. The ink is generally dry on the screen board, and it begins to dry after about 10 minutes. This is the standard for screen printing inks. However, the general screen printing ink does not have the problem of rapid drying. Even if the weather is dry, there will not be any obvious plug-in phenomenon. If a similar problem occurs, the main reason is that there is a problem with the formula of the ink factory.

Let's look at the close relationship between solvents and screen printing inks

Solvents are indispensable materials in screen printing and have a crucial influence on the quality of screen printing and quality of printed matter. In screen printing, solvents and screen printing inks are closely related and must be given full attention. Here are some simple explanations.

Solvents in Screen Printing

(1) Dissolve resin: Dissolve in different solvents (polar, non-polar) according to different resin requirements.

(2) Liquidity: Different manufacturers produce similar products with different solvency, which directly affects the viscosity of the ink.

(3) Gloss: The same or different solvents with different volatilization speeds will cause fog and whitening of the ink film when it is released in the printing ink film, thereby affecting the gloss of the printed surface.

(4) Drying time: Since different printing methods are selected during the printing operation, as well as the differences in the printing environment, climatic conditions, and formulation requirements, the boiling point of the solvent is different to provide an appropriate drying time.

(5) Residual of the solvent: The low-viscosity solvent partially contributes to the long open time of the ink film and reduces the residual solvent.

Solvent setting of screen printing ink characteristics

(1) Solvent: The solvent used to dissolve the stable viscosity of the resin in accordance with the basic conditions of the ink quality when the ink is produced.

(2) Co-solvent: Solvents with good solvent power in the main solvent, but with some disadvantages in other conditions.

(3) Diluent: The resin of the ink itself does not have a dissolving power, and it has a dissolving function after being mixed with the main solvent to reduce the ink viscosity. Diluted ink effect.