Performance Analysis of High Viscosity, Low Viscosity Offset Ink (Part 2)

Second, the use of such resin long-chain alkyl phenols (octyl phenol, nonyl phenol, dodecyl phenol, etc.) helps to improve the solubility of the resin. Therefore, although the higher alkylphenol phenolic resin has a large molecular weight and a relatively high softening point, it has good solubility in vegetable oils and a certain range of mineral oil solubility. Good oil solubility helps make the ink less viscous and also helps improve the flow of the ink.

Therefore, inks with high viscosity, strong cohesion, good elasticity, low viscosity, and good fluidity have good printability.

In addition, such high-viscosity resins contain hydrophilic carboxyl groups, polyols, and other polar groups, which is conducive to improving the wettability of the pigment; at the same time, it also contains a long-chain alkyl group that is lipophilic (hydrophobic), and therefore very Good oil-water balance, which is very beneficial to ensure the ink's good rheological properties and water resistance.

In short, high viscosity and low viscosity ink has many excellent properties, including two aspects: First, the ink itself has the inherent characteristics, such as high adhesion, high gloss, fast fixation, strong water resistance; second, good printability , such as good ink transferability, transferability, dot reproducibility and so on.

4 High Viscosity and Low Viscosity Ink with Broader Adaptability

High-viscosity and low-viscosity inks are excellent in performance, and the requirements for viscosity and fluidity are very loose, and the quality is also guaranteed.

(1) The overall shift of the graph indicates that the viscosity of the ink can be greatly reduced.

Due to high resin viscosity, good elasticity, and strong cohesion, even if the viscosity is significantly reduced, the ink can still maintain sufficient high viscosity and good flow properties. Therefore, there will be no problems such as poor delivery, no ink, and piles of ink.

(2) The overall expansion of the graphic EFGH shows that the control range of the viscosity and fluidity of the ink can be relaxed.

The higher alkylphenol phenolic resin has a sufficiently high viscosity and good dissolution properties. Therefore, even if the viscosity of the ink is made much lower than that of the ordinary low viscosity resin binder ink, the ink can maintain sufficient viscosity. On the other hand, because the viscosity of the ink is low, even if the viscosity is made a little higher, the ink can still be thick and sticky, flow without soft, thick and loose.

Similarly, since such inks have sufficient viscosity and elasticity, even if the fluidity is made a little larger, the ink will not appear soft and there will still be a good body bone; on the other hand, due to the low viscosity of the ink, even With less fluidity, the ink will not stick.

(3) The EFGH rectangles are all within the safety zone, not just the diamond ABCD. In the area of ​​the rectangular EFGH (which has been enlarged), the viscosity of the ink is higher and lower; the fluidity is larger and smaller; and both the ink performance and the use effect can be maintained.

5 High-viscosity, low-viscosity ink technology adapts to both sheetfed offset inks and rotary offset inks

High-viscosity, low-viscosity ink is a product of rapid development in the printing industry. People should see that high-speed printing of lithographic offset sheet requires high-viscosity, low-viscosity ink. The rapid development of rotary offset printing technology also requires high-viscosity and low-viscosity offset offset printing inks. This fact is also proved by this fact. Since 2000, the company started to research and develop a new generation of rotary offset ink formulations that completely use rosin-modified phenolic resin binders and achieved success. After years of production and use, it has matured. This kind of high viscosity and low viscosity web offset printing ink has obvious performance advantages. There are some characteristics of lithographic offset printing sheet-fed ink. Some technical indicators are similar or similar to lithographic offset printing sheet-fed ink.

Source: Print Quality and Standardization