Ink is one of the important raw materials for printing production, and its performance directly affects the printing quality and production efficiency of the product. Therefore, to correctly understand and understand the performance of the ink, in the actual production operation process, according to the printing conditions and characteristics, appropriate adjustments and improvements to certain properties of the ink will play a better role in improving production efficiency and product quality. . 1. Thixotropy The thixotropy of ink means that the ink becomes thinner after stirring and rubbing, and its fluidity increases, and after standing for a period of time, the ink will return to its original thick state. In the process of printing and transferring ink, the friction of the ink fountain and the rubber roller increases the temperature, so the fluidity and ductility also increase. After the ink is transferred to the printed sheet, the fluidity, The ductility is reduced, and then it becomes thinner and thicker, thus ensuring the clarity of the printing ink color. If the thixotropy of the ink is too large, it is easy to cause defects such as ink blocking and paste printing. As the printing process progresses, the ink becomes thinner and thinner, and the ink color of the printed product becomes lighter and lighter, resulting in unclear graphics and text. problem. If the ink thixotropy is too large or too small, it will have an adverse effect on printing. Printing requires that the ink has appropriate thixotropy. 2. Viscosity Viscosity refers to a property that prevents the flow of fluid substances. It is a measure of the interaction between fluid molecules that hinders the ability of relative movement between molecules, that is, the resistance to fluid flow. If the viscosity of the ink is too high, the transfer of the ink is not easy to be uniform during the printing process, which is easy to cause the printing sheet to be dirty, the ink transfer and the ink distribution are uneven, and the paper powder is pulled off, which makes the plate slurred or blooming. It is easy for slip glue to cause printed streak marks, as well as faint imprinting, ink emulsification, and dirt. 3. Liquidity Flowability means that the ink will flow like liquid under its own gravity, which is determined by the viscosity, yield value and thixotropy of the ink, and it is also closely related to the temperature. The fluidity of ink affects the transfer of ink between ink tanks, ink fountains, ink rollers and substrates, thus affecting the printing effect. Ink with large viscosity has poor fluidity; ink with low viscosity has good fluidity. 4. Dryness The ink should have good drying performance. Ink drying too fast or too slow will affect the printing process control and printing quality. If the drying of ink is too slow, the back of the printed matter during the stacking process is likely to cause dirt on the back, and adhesion will occur in severe cases; the print is dull and even powdered. If the ink dries too fast, it is difficult to control the fluidity of the ink during the printing process, which causes the ink roller to stack and transfer ink, the ink color is inconsistent before and after, the paper is powdered and fluffed, the ink film is crystallized, and the ink is destroyed. Roller surface properties. 5. Fineness The fineness of the ink refers to the size of the pigment (including filler) particles in the ink and the uniformity of the pigment particles distributed in the binder. Ink with poor fineness is easy to produce quality problems such as uneven ink transfer and ink distribution, accumulated ink paste plate, worn plate, and poor color rendering during the printing process. The fineness of the ink is relatively large, and the printing is relatively clear. If the fineness of the ink is poor, the dotted layout of the printing product is prone to hairiness and scumming, and the printing durability of the printing plate is also low. 6. Coloring power The color strength of the ink determines the shade of the ink hue. When the coloring power of the ink is large, the printing hue is darker; otherwise, the printing hue is lighter. Ink with large tinting strength consumes relatively little ink and has good ink color quality during printing; on the contrary, ink with low tinting strength uses relatively large amount of ink when printing, and the ink color is relatively light. 7. Yield value Yield value refers to the minimum shear stress required to start the flow of liquid. Ink with too large a yield value has poor flow properties; with ink with a too low yield value, printed dots are prone to halo and unclear. 8. Light resistance Under the action of light, the performance of the color of the ink relatively changing is called the light resistance of the ink. In fact, there is no ink that does not change color. Under the influence of light, the color of any ink will change more or less. Ink with good light resistance, the printed product has bright color, the dots on the layout are full and strong, full of three-dimensional sense, and can be stored for a long time. For inks with poor light resistance, the printed ink colors are prone to fading and discoloration. 9. Acid and alkali resistance and alcohol resistance Ink with strong acid resistance, alkali resistance and alcohol resistance, the printed product has bright ink color, clear layout and clear dots. The basic requirements of packaging products for printing inks are acid resistance, alkali resistance and alcohol resistance. For example, for packaging printed products such as soap, soda or food, the ink used must have good acid and alkali resistance. In addition, the glazing oil contains alcohol solvents, so the products that need to be glazed must consider the use of alcohol-resistant inks to avoid adverse phenomena. The properties of paper and ink are varied, and they all affect the quality of printed products to a certain extent. Understanding and understanding the nature of paper and ink can help to avoid the blindness of printing process operations, prevent the occurrence of faults in the printing process, and improve the printing efficiency and quality simultaneously. ChangQingShu BabyToy ChangQingShu BabyToy Shantou Chenghai Sweet Baby Toys Firm , https://www.sweetbabytoys.com