A Brief Analysis of Common Knowledge and Techniques of Screen Printing Inks

Silk screen printing in our lives is also more and more people's favor, mainly the screen printing out vivid patterns, so that consumers are easy to accept, then tell us about screen printing ink common sense and skills.

1. Ink composition (1) The binder material is the main component of the screen printing ink, which acts as a disperse pigment, gives the screen printing ink proper adhesion, fluidity, and transfer properties, and the film is fixed after the printing to fix the pigment. The role of print surface. The connecting material is commonly known as varnish, and commonly used tools for knives can be made of various materials, such as various dry vegetable oils. Most of them can be used to make printing inks. Mineral oils can also be used as connecting materials. And water, as well as a variety of synthetic resins can be used to make the connection material.

Screen printing ink rheology, viscosity, neutrality, acid value, color, water resistance, and printing performance mainly depends on the binder, the same kind of pigment, using different binders, can be made into different types of screen printing ink; and the same kind The binder uses different pigments. The screen printing ink produced is still of the same type, because it cannot change the fundamental performance of the ink, so the quality of the screen printing ink is good or bad, and except for the pigment, it mainly depends on the connecting material.

(2) Pigments Pigments are high-dispersion powders of color, black, or white that are insoluble in water and organic solvents. According to their source and chemical composition, they are divided into organic pigments and inorganic pigments.

1 Inorganic pigments are oxides of non-ferrous metals, or some metal-insoluble metal salts. Inorganic pigments are further divided into natural inorganic pigments and artificial inorganic pigments. Natural inorganic pigments are mineral pigments.

2 Organic pigments are colored organic compounds and are also divided into natural and synthetic categories. Nowadays, synthetic organic pigments are commonly used. There are many varieties of organic pigments, and the colors are relatively complete. The performance is superior to that of inorganic pigments.

Dyes are organic compounds, which are soluble in water and sometimes also dissolved in organic solvents. Insoluble color deposits, called lake pigments, can be prepared from certain dyes for the production of screen printing inks.

The requirements for the pigments used in printing inks are quite high, especially the color, dispersion, light resistance, transparency, etc., and the hue of the color pigments is required to be close to the spectral color, the saturation should be as large as possible, and the magenta and cyan used for the three-primary screen printing inks are used. The transparency of yellow pigments must be high. All pigments must not only have water resistance, but also should be quickly and uniformly combined with the binder. The oil absorption capacity of the pigments should not be too large. The pigments should preferably have properties such as alkali resistance, acid resistance, alcohol resistance, and resistance.

(3) Additives Additives are materials that are added to screen printing inks and, in printing, to improve the performance of the screen printing inks themselves. The screen printing ink formulated according to the basic composition still cannot meet the requirements in certain characteristics, or it must be added with a small amount of auxiliary materials when the requirements for printing use cannot be met due to changes in conditions.

(4) Filler The filler is a white, transparent, translucent, or unpleasant powder substance. Mainly from the filling, filling the pigment part, the appropriate use of some filler, can reduce the amount of pigment, reduce costs, but also can adjust the properties of screen printing ink, such as thin, fluidity, etc., but also improve the flexibility of formula design.

1. There are many additional materials, such as: desiccant, anti-drying agent, diluting agent, remover, plasticizer and so on.

2. Types of Screen Printing Inks There are a wide variety of screen printing inks that can be classified in various ways:

(1) According to the printing method, it can be divided into four types according to the layout: letterpress, lithographic, gravure, photogravure, screen printing, etc.;