The basic composition of ordinary printing ink

Ink is generally composed of pigments, binders, fillers, additives, etc. What are the effects of these raw materials, respectively, as detailed below.

(1) Pigments

Pigments play a colorizing role in the ink, which in turn has a direct effect on some properties of the ink.

The pigment is a color, black or white highly disperse powder that is insoluble in water and organic solvents. According to its source and chemical composition, it is 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 divided into natural inorganic pigments and artificial inorganic pigments. Natural inorganic pigments are mineral pigments.

2) Organic pigments are colored organic compounds, 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 precipitates, called lake pigments, can be prepared from certain dyes for the production of 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 color pigments is required to be close to the spectral color, the saturation should be as large as possible, and the magenta, cyan, and yellow colors used for the three primary color inks should be used. The transparency of the pigment must be high. All the pigments should not only be water-resistant, but also should be quickly and evenly combined with the binder. The oil-absorbing ability of the pigment should not be too large. The pigment is preferably resistant to alkali, acid, alcohol and resistance.

(2) Connection material

The binder is the main component of the ink, serves to disperse the pigment, imparts proper sticking, fluidity and transfer properties to the ink, and serves to fix the pigment on the surface of the print after filming by printing. The connecting material is commonly known as varnish.

The binder can be made of various materials, such as various dry vegetable oils, most of which can be used to make binders for inks, mineral oils can also be made into binders, solvents and water, and various synthetic resins can be used to make them. The binder.

The rheology, viscosity, neutrality, acid value, color, water resistance, and printing performance of the ink are mainly determined by the binder. The same pigment, using different binders, can be used to make different types of inks; Use different colors. The ink produced is still the same type of ink, because it can not change the fundamental performance of the ink, so the quality of the ink is good or bad, but depends on the pigment, but mainly depends on the connection material.


(3) Packing

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 the ink, such as thick, fluidity, etc., but also improve the flexibility of formula design.

(4) Additives

Additives are some of the materials added to improve the performance of the ink itself during the manufacture of the ink, as well as during printing. The inks formulated according to the basic composition still cannot satisfy the requirements in certain characteristics, or they must be added with a small amount of auxiliary materials when they cannot meet the requirements for printing use due to changes in conditions.

There are many additives, such as: desiccant, desiccant, thinner, remover, plasticizer, etc.


Printing ink

The printing ink is mainly composed of pigments, fillers, binders, etc. The choice of pigments is an important step in determining the hue and vividness of printed products. Many manufacturers and ink manufacturers have customized special inks for printing of each product. Its formula is kept confidential by the ink factory. For example, the “China” and “Peony” cigarettes produced by the Shanghai Cigarette Factory are printed with special inks that are specially customized at the Shanghai ink factory. This type of ink does not know that the detailed formula is difficult to tune, and therefore has a better anti-counterfeit effect.

Composite ink

After mixing two or more anti-counterfeit inks in a certain proportion, composite inks with new properties can be developed. If the ink formulations are not fully understood, it will be difficult to imitate them.

Other security screen printing ink

Plastic security ink. Applicable to PP, PVC, PE, PS, ABS, PC and other plastic products, with 150 ~ 200 mesh polyester net, each kilogram of ink can be printed 20 ~ 30m. , Dry naturally or at 130 °C for 3 minutes.

Metal, glass, ceramic security ink. Suitable for printing on metal temperature signs, color-changing glass ware, color changing milk cups and ceramic tea sets, etc., with 70 to 100 mesh polyester mesh, 10 to 20 square meters per kilogram of ink, and drying conditions of 25, 48, or 120 degrees Celsius. 45min.

Glass, ceramic decal transfer paper security special ink. Applicable to the printing of glass and ceramic decals, with a 150 to 200 mesh polyester web, and the drying conditions are 200°C and 20 minutes after water transfer.

Water-based security inks and printing pastes. Applicable to printing on paper, cotton, knitted fabrics, T-shirts, sportswear, etc., with 80 ~ 150 mesh polyester net, each kilogram of ink can be printed about 20m2 (cotton fabric will be less than this number), drying conditions for 130 °C, 3min.