Color Printer Ink

Color printer ink is mainly composed of pigment, connecting material, filler, additional material, etc. Pigment plays a role in color rendering in ink, and it has a direct impact on some characteristics of color printing ink. Pigment is a kind of color, black or white high dispersion powder insoluble in water and organic solvents. According to its source and chemical composition, it can be divided into organic pigment and inorganic pigment. Binder is the main component of ink, which plays the role of dispersing pigment, giving ink proper adhesion, fluidity and transfer performance, and fixing pigment on the surface of printed matter through film-forming after printing.

The connecting material is commonly known as ink blending oil. Connecting materials can be made of various substances, such as various various synthetic resins. The rheology, viscosity, color, water resistance and printing performance of color printing ink mainly depend on the connecting material. The same pigment can be made into different types of ink by using different connecting materials; Different pigments are used for the same connecting material. The ink made is still the same type of ink. Because it can not change the fundamental performance of the ink, the quality of the ink mainly depends on the connecting material in addition to the pigment. The filler is white, transparent, translucent or unsightly powdery material. The main filling function is to fill the pigment part. The appropriate use of some fillers can not only reduce the amount of pigment and reduce the cost, but also adjust the properties of ink, such as thickness and fluidity, and improve the flexibility of formula design.

Additional materials are some materials added to improve the performance of the ink itself in the manufacture of color printing ink and in the use of printing. When the ink prepared according to the basic composition still cannot meet the requirements in some characteristics, or cannot meet the requirements for printing due to changes in conditions, a small amount of auxiliary materials must be added.

The hue, lightness and printability of color printer ink are directly related to the quality of color printing products, so we must correctly grasp the allocation method of ink.

It is very important to master a principle to allocate ink, that is, try to use the same type of ink and the same type of auxiliary materials. In addition, the number of primary color inks should be minimized, that is, those that can be mixed with two primary color inks should not use the third one, so as not to reduce the brightness of the ink and affect the brightness of the color. There are two kinds of color printer ink allocation. One is dark ink allocation, that is, the ink prepared with three primary colors or intermediate colors without any diluent; The other is light ink, that is, the ink prepared by adding diluent into the original ink.

Color printing inks formula Daquan, water-based ink test report has several items

Color printing inks, flexographic water-based ink, also known as liquid ink, is mainly made of water-soluble resin, solvent, organic pigment and related additives. Water based ink is especially suitable for packaging and printing products with strict sanitary conditions, such as food, beverage, medicine, tobacco, wine, children's toys and so on. Water based ink is the ink used in most flexographic packaging and printing. Water soluble resin is the binder of water-based ink. Water soluble acrylic modified resin is used as the binder. It has significant advantages in heat resistance and chemical resistance. The following micro spectrum introduces the knowledge of color printing inks composition detection.

Color printing inks composition test items:

Ink performance test: color, initial dryness, coloring power, gloss, fineness, viscosity, adhesion fastness, fluidity, conjunctival dryness, etc;

Pigment performance test: oil absorption, sieve residue, coloring power, content, pH value, relative density, dispersion, fluidity, etc;

Dye performance test: content, moisture, solubility, solution stability, fineness, viscosity, ash, fixation rate, dust flying, etc;

Aging test: neutral or acid salt spray test, heat stability, UV aging, xenon lamp aging, liquid medium resistance, etc.

Composition test standard:

ASTM d6073-2008a test method for relative solidity of thermosetting printing inks

ASTM d6165-1997 (2008) guide for comparison, detection and identification of odors of paints, inks and related materials

ASTM d4942-2011 test method for water absorption lithographic inks and color carriers in laboratory mixers

ASTM d5010-2008ae1 guide for testing printing inks and related materials

Complete recipe:

Water based ink is mainly made of water-soluble resin, organic pigment, solvent and related additives through compound grinding.

The basic formula of water-based ink: water-soluble acrylic resin 25% ~ 35%; Water 15% ~ 25%; Pigment 10% ~ 30%; Ethanol 5% ~ 15%; Triethylamine 5% ~ 10%; Auxiliary 1% ~ 3%.

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