Solvent dissolving power in 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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