Printing ink composition and the types of choices Profile
Printing inks and screen printing ink similar, but not fast volatile ink printing, or ink will dry in the network box. Instead, printing ink is necessary to have a high degree of volatile functions, so that ink can easily stick on and leave the plastic head. In addition, the silkscreen printing ink will be thinner than that. (Figure 1)
Printing ink ingredients, including: Resin (20%) used to form a thin ink combined with colorants. Different resins to meet the different drying methods.
Pigment (17%) brought to ink color and become opaque.
Solvent (60%) resin pigment compounds that can be printed to the object. Printing will need to use more volatile solvent, but to choose the most appropriate depends on the other ink ingredients are. Because there is no solvent is multifunctional, so often need to combine multiple to use.
Additive (3%) ink can make a more smooth and increase the stability of pigment. The lack of ink additives will become easy to crack, less tension and pigment separation.
Ink types Ink is in the market divided into seven major categories:
Solvent evaporation type printing ink accounted for most of the market. Very fast drying characteristics, but not too easy to use does not absorb the material, because of the need to achieve better absorption of ink adhesion results. To test the applicability of a resin ink, only the solvent gently to the colloid surface friction, if the resin is dissolved, the ink is usually very easy to stick on.
Oxidative The ink absorb oxygen from the atmosphere, further polymerization to form a solid ink. It is less likely to be used in printing technology, because evaporation is slower, but can be metal and glass surfaces have very good results.
High reaction type polymerization can be carried out, but after adding the catalyst can not be for too long.
Xh baking class needs a specific temperature and time for drying. The higher the temperature, the shorter the drying time.
UV drying class widely used screen printing technology, faster drying, easier to print, less susceptible to external factors. Because non-solvent, it can not rely on volatile solvent when dry, but it is for this reason, these inks will be more tight.
sublimation sublimation category refers to material from a solid into a gas directly. This ink to heat about 392 ° F (200 ° C) will become a gas, will be printed out management holes, then ink can penetrate objects. When the object cools, ink and objects on the surface become one.
ceramics and glass and screen printing ink type is similar to printing ink is solid state, and in 176 ° F (80 ° C) to become liquid.
Choice by printed ink Tension than if the ink large objects, ink can not attach onto the surface of objects. To improve this situation, the objects need to pre-treatment by other methods. Therefore, the effective adhesive to ink on the object, the ink surface tension of the necessary energy lower than the object (Figure 2). When the object surface grease, dust or other additives, are required to pre-clean to ensure the best color results.
In addition, there are many factors that will affect the ink performance, such as the object has a different approach and the degree of drying. To improve the quality of ink used should make appropriate choices, testing and preparation.
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