Analysis: the printing properties of printing inks

(1) Color

The color of the ink, regardless of the degree of hue and tonal gradation, must be consistent. The same number of inks produced by the ink factory often have different colors due to the different batches. It is necessary to check whether they meet the requirements when mixing the inks.

(2) Coloring power

Coloring power is the concentration of ink. The color strength of the ink is related to the dispersion of the pigment in the ink, the amount of pigment, and the selective reflection of the wavelength of light by the pigment.

Ink coloring power has a close relationship with printing quality and cost. The ink with strong coloring power is used in a small amount when printing, and has good printing adaptability, and can print products with fine screen threads.

(3) Hiding power

The hiding power is the transparency of the ink. The transparency of ink is one of the signs of ink performance, which determines the printing color sequence of the product. In multi-color overprinting, if the transparency of the ink used is high, the third color will appear. But the ink with poor transparency can only be used as the first color when printing, otherwise it will affect the quality of the product.

When the ink is coated into a very uniform film, the degree of display of the background color of the material that bears the ink film indicates the level of transparency (or hiding power) of the ink.

(4) The fluidity of the ink

At a certain temperature and a certain volume of ink, under a certain gravity, after a certain period of time, the diameter of the ink spread out is called the fluidity of the ink. The fluidity can be simply regarded as an indicator for determining the thinness of ink, expressed in millimeters (MM).

(5) Dryness of ink

The drying property of the ink is the time required for the ink to dry after being printed on the substrate.

Dryness is an important quality indicator of ink. Whether the ink is printed on the substrate or not can be dried as required, which directly affects the quality of the printing effect. Generally, many faults that occur during the printing process are caused by the poor dryness of the ink, such as: sticky dirt (the back side is rubbed), which is caused by the poor dryness of the ink. For this reason, the determination of ink dryness is an important means to control the quality of ink and achieve good printing results.

(6) The viscosity of ink

The viscosity of the ink is an indicator of the quality of the ink. If the viscosity is too large, the printing process will produce a roughening phenomenon. If the viscosity is too small, the dot expansion phenomenon will occur. The viscosity of the ink directly affects the quality of the printed matter.

(7) Viscosity of ink

The viscosity of the ink refers to the degree of viscosity of the fluid. The viscosity of the ink is an important indicator for all types of ink. Each type of ink has a certain viscosity range, but for the same type of ink, the requirements are the same, that is, the faster the printing speed, the lower the viscosity of the ink.

The viscosity of the ink is related to many factors:

(1) Related to the binder, for ink products formulated with the same pigment, the greater the viscosity of the binder, the greater the viscosity of the ink.

(2) It is related to the amount of pigments and fillers. For the same binder, the larger the pigments and fillers used, the greater the viscosity of the ink.

(3) It is related to the size of pigment and filler particles. For the same binder, the amount of pigment and filler is the same. The larger the particle size of the pigment and filler used, the smaller the viscosity of the ink and the smaller the particles. The greater the viscosity.

(4) It is related to the dispersion of pigments and fillers. The better the pigments and fillers are dispersed in the binder, the lower the viscosity of the ink, and vice versa, the greater the viscosity of the ink.

(8) The gloss of the ink

Ink gloss refers to the amount of light that can be felt from the ink film surface with regular reflection. That is to say, the amount of light reflected by the ink printed matter under the irradiation of a fixed light source is expressed by the reflectivity (percentage).

(9) Light resistance of ink

The lightfastness of ink refers to the performance of using ink to maintain the same color under sunlight. In general, the ink must have good light resistance. If the ink used is not lightfast, the printed matter will change color and fade. The heat resistance of the ink is used to describe the degree of discoloration of the ink when baked at a certain temperature. Its heat resistance mainly depends on the nature of the pigment. Some pigment groups are not heat resistant, so their structure will change at high temperature, which will cause discoloration.

(Ten) fineness

Fineness is a physical quantity indicating the size of pigments, filler particles in the ink, and the uniformity of the distribution of pigment particles in the binder.

The fineness of the ink is also one of the indicators that reflect the main properties of the ink. In the three-color screen printing, the thicker the ink particles, the easier it is to paste the plate, and at the same time it will reduce the printing plate's durability. The finer the ink particles and the stronger the coloring power, the better the product quality.

(11) Density

When the temperature is 20 ° C, the weight of one cubic centimeter of ink is the specific gravity of the ink. Its weight is expressed in grams. The density of the ink has a special effect on printing. When printing with high-density ink, the printing plate is prone to ink accumulation, especially in high-speed printing, the uniformity of the high-density ink is easy to be destroyed Failure of stack or paste version.

When inks are mixed, the specific gravity ink generally consumes more, and the ink with a smaller specific gravity consumes less specific ink under the same conditions. In addition, when the specific gravity ink is mixed with the ink with a lower specific gravity, Easy to layer, and make the color change.

(12) Thixotropy

It refers to a performance that the ink becomes thinner when it is subjected to external force, and then returns to its original state after being left to stand. The thixotropy is too strong, which makes it difficult to rotate in the ink hopper, and makes it difficult for the rotary machine to transport ink.

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