The Composition Of Screen Printing Ink

Screen printing ink, also known as screen printing ink, usually refers to the use of screen printing ink, and other types of ink are the same with pigment, resin, solvent, additives mixed grinding. There are many kinds of screen printing ink, you can choose the corresponding ink printing according to different materials, which is also the special place of screen printing process superior to other printing processes. The firmness of screen printing generally depends on the choice of screen printing ink.

Connecting material

Connecting material is the main component of screen printing ink, plays a role in dispersing pigment, giving the screen printing ink with appropriate adhesion, fluidity and transfer performance, and the role of pigment fixation on the surface of printed matter through film formation after printing. Connecting material commonly known as ink oil, and the common tool ink knife
Connecting material can be made of various substances, such as a variety of dry vegetable oil, most can be used to make ink connecting material, mineral oil can also be made of connecting material, solvent and water, and a variety of synthetic resins can be used to make connecting material.
Screen printing ink rheology, viscosity, neutral, acid value, color, water resistance and printing performance mainly depend on the connection material, the same pigment, using different connection material, can be made of different types of screen printing ink; And the same connection material, using different pigments. Made of the same type of screen printing ink, because it can not change the fundamental performance of the ink, so the quality of the screen printing ink, in addition to the pigment related, mainly depends on the connection material.

pigment

Pigment is insoluble in water and organic solvents of color, black or white powder with high dispersion, according to its source and chemical composition, divided into organic pigment and inorganic pigment two categories.

Inorganic pigment

Is the oxide of non-ferrous metals, or some metal insoluble metal salts, inorganic pigments are divided into natural inorganic pigments and artificial inorganic pigments, natural inorganic pigments are mineral pigments.

Organic pigment

Are colored organic compounds, also divided into natural and synthetic two groups. Synthetic organic pigments are commonly used now. There are many varieties of organic pigments with complete colors and better performance than inorganic pigments. Dye is an organic compound, it can be dissolved in water, sometimes also dissolved in organic solvent, from a dye can prepare insoluble color precipitate, called lake pigment, for the manufacture of printing screen printing ink.
The pigment used in printing ink requires quite high requirements, especially color, dispersion, light fastness, transparency, etc., the hue of color pigments is close to the spectrum color, saturation should be as large as possible, the transparency of magenta, green and yellow pigments used in the three primary color silk screen printing ink must be high, all pigments should not only be water resistant, but also quickly and evenly combined with the connecting material, The oil absorption capacity of the pigment should not be too large, and the pigment had better have alkali resistance, acid resistance, alcohol resistance and potential resistance.

Additional charging

Supplementary feeding is in the manufacture of screen printing ink, as well as in the use of printing, in order to improve the performance of the screen printing ink itself and some additional materials. According to the basic composition of the silk screen printing ink, in some characteristics can not meet the requirements, or due to the change of conditions, and can not meet the requirements of printing use, must be added to a small number of auxiliary materials to solve.

packing

Fillers are white, transparent, translucent or opaque powdery substances. Mainly plays the role of filling, filling pigment part, the appropriate use of some fillers, not only can reduce the pigment consumption, reduce the cost, but also can adjust the nature of screen printing ink, such as thin thick, fluidity, but also improve the flexibility of formula design. There are many additional materials, such as: desiccant, desiccant, diluting agent, viscosifier, plasticizer and so on.