Offset Printing Ink Needs To Pay Attention To The Six Technical Indicators

1. Concentration: Ink concentration is the pigment content of the indicator pigment, generally accounting for about 20% of the total amount of ink. Generally through the detection of coloring power to determine the size of the ink concentration. In printing with the same amount of ink, ink concentration, the color of the print is thick, and vice versa, the color of the print is light. Especially when printing large areas of the field, the concentration of ink on the impact of printing quality is particularly significant.

2. Fineness: the fineness of the ink indicates that the ink pigment, filler particle size and uniformity of distribution in the linking material. The fineness of the ink and the nature of the pigment and particle size have a direct relationship. The better the fineness, the more stable the nature of the ink, the printed product network is full and strong. Conversely, in the printing plate is prone to low print resistance, ink pile, network emptiness, expansion and network does not glossy and other ills.

3. Viscosity: the viscosity of the ink with the ink viscosity meter test. The size of the ink viscosity value is the size of the force that separates the ink film between the two rollers of the viscometer. Ink viscosity is too large or too small will affect the quality of printing. In addition, according to the printing order to choose the relative viscosity size of each color ink. Under normal conditions, it is not necessary to adjust the viscosity of the ink, if you need to adjust the viscosity, consistency of the situation to choose additives.

4. gloss: ink gloss is the ink printing sample in a specific light source, a certain angle of irradiation, the amount of light reflected and the amount of light reflected from the standard plate, expressed as a percentage. Generally speaking the higher the luster feeling the better the printing effect. Although the luster of the print and printing with the wetting solution used, the absorption of the paper also has a certain relationship, but mainly by the ink decision. This nature of the ink and mainly depends on the linking materials and pigments. The linking materials and pigments in the ink to have a good printability, in addition to the resin itself high gloss. Such ink printed on paper graphics gloss is high.

5. Dryness: offset ink drying process on paper is the ink from the liquidity of the non-polar colloid into a fixed state of the process. The general measure of offset ink is divided into two indicators of fixation speed and oxidation film drying. At present, offset printing ink are resin-based, fast fixation speed. Theoretically, the faster the initial dry the better, but the initial dry too fast will affect the gloss of the print. General about 80% of the ink crystalline film drying time between 16-30 hours.

6. Color stability　　

For printers, the stability of the ink is also related to the quality of the print. There are printers use the same brand and the same model ink process, although the ink formula and use the same environment, but due to changes in raw materials and production conditions of the ink plant, resulting in the same brand and model of ink performance some differences. Especially now the case of increased pressure on environmental protection, chemical raw materials often face shortages and price increases, ink factories in order to ensure production and cost considerations are bound to replace some of the raw materials, such as with the same red ink, according to the same proportion of ink transfer, but there is a significant color difference.

In short, printers choose a suitable ink, and often focus on the above six key indicators of ink, then the problem of ink will not bother your production, thereby improving efficiency and product quality.