The hottest ink market expects more perfect offset

2022-08-17
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The ink market is looking forward to more perfect offset printing inks

in order to meet the diversified requirements of users for the quality and variety of printing materials, printing publications and printing packaging products must develop in the direction of diversification and high-grade. In order to achieve this goal, printing plants need newer and better inks while constantly updating and improving printing equipment. Offset printing ink has always been in an important position in the printing field, representing the current situation and development direction of ink products. However, the technical level of domestic offset printing ink is still in the development stage, and there is still a certain gap compared with imported similar inks. Printing users still often have problems in the use of ink. The problems users often encounter and the requirements for ink are also the best guidance for ink manufacturers to improve their products

there is a direction to improve the quality

the maximum stress value reached from the beginning to the time of fracture. In recent years, ink manufacturers have made great efforts in the main technical indicators of offset printing ink, such as color concentration, dryness, water resistance, printability, on-board stability, and have also made remarkable achievements. Nevertheless, the development speed of ink still seems to be slower than that of printing technology, and its quality deficiencies are always exposed during printing

1. color concentration

color concentration is the saturation of color. Now, newspapers are no longer black and white, but more colorful newspapers with pictures and texts. Therefore, users have higher requirements for the color concentration of offset printing ink for newspaper printing. The advertisements, pictures and titles in color newspapers are quite eye-catching, so the color concentration of ink needs to be relatively improved. But now the color concentration of many newspaper inks is not ideal. In order to ensure the printing density, printing plants have to increase the amount of ink, or increase the percentage of points, which is bound to cause ink pile and increase the amount of ink used. The level and color of printed matter are not only related to ink, but also related to plate making, printing equipment, ink balance and other process conditions. The quality of ink is also the premise and guarantee of improving printing quality

2. Overprint

there are two main requirements for the chromaticity of offset printing ink in newspaper printing, one is the color sequence, the other is the gradual change of ink viscosity. At present, the standard color sequence of newspaper printing in the world is green magenta yellow black, and the viscosity should gradually decrease, otherwise the ink will pull back

3. Dryness

the drying speed of ink usually affects the printing quality, and at the same time, it will also cause many printing faults, such as causing the back of the printed matter to stick dirty, and even causing the web printing to fail to work normally. In the interview, users generally reported that the dryness of domestic ink has a great impact on the quality of printed matter. Director Feng of Shandong Xinhua Weifang factory has a deep understanding of the importance of ink drying: "the workshop rushed to print publicity materials before the factory celebration. At that time, it was printed with matte coating paper, and it was dried for a week after printing, delaying the event; in addition, there was a case that the peach ink used for the sealing of printed textbooks did not dry for 3 days after printing. The above problems were caused by the poor drying of the ink." Of course, these are typical phenomena, but problems such as printing defects, waste products and dryness greatly affected by season and climate due to incomplete drying of ink cannot be ignored

4. printability

in modern printing, there are more varieties of substrates, more types of auxiliary consumables, and greater differences in performance. Therefore, the requirements for ink are more complex. Beijing Guocai Printing Co., Ltd. attaches great importance to the printability of the ink. According to the director Lu Qiquan, in order to ensure the printability of the ink on the machine and the adaptability of the ink to various consumables and substrates, they often keep in touch with several fixed ink suppliers and tell their special requirements to the ink suppliers. Director Feng of Shandong Xinhua also believes that the printability of ink and various printing materials is very important. For example, when they use ordinary offset ink to print coated paper, the pictures and texts printed on coated paper are bright in color and glossy; While printing light coated paper with the same ink, the penetration phenomenon is more serious, and the gloss decreases, but it seems that there is no printing ink specially suitable for light coated paper in the market, so he hopes that the ink factory can develop the corresponding ink according to different printing materials, especially the new materials commonly used now, such as light coated paper

in addition, the printing ink selected varies with the equipment of the newspaper printing plant. As Mr. Zhu of Xinhua told us: "Our newspaper printing machine is an inking method, which has high requirements for the performance of the ink. At present, the performance of domestic newspaper printing ink, such as rheology and viscosity, cannot fully meet our requirements. The printing equipment of the inking method also has the problems of paste and dirt, and the newspaper has high requirements for pictures and titles, so the ink factory needs to adjust the relevant performance of the ink according to our actual situation"

it can be seen that the printability of offset printing ink needs to be further adjusted. If every user puts forward special requirements, the ink factory may not be able to cope

5. Stability

for printing plants, the stability of ink is also related to the quality of prints. When talking about the stability of offset printing ink, Lu, the director of Beijing Guocai, stressed: "We have used some foreign brand inks produced in China. Although the ink formula is the same as that of imported products, there is a certain gap between the production conditions and management level of domestic ink factories and the original ink manufacturers, resulting in some differences in the performance of inks of the same brand and model. If we use the same red ink and adjust the ink in the same proportion, there is a significant color difference." There is still a big gap between domestic inks and imported inks in terms of ink colorability, environmental protection and drying speed. Moreover, domestic inks have poor fluidity and high viscosity, and sometimes they have to add viscosity removers. Printing plants hope that the viscosity of ink can be improved and gradually replace imported high-end products. High priced ink. Mr. Zhu of Xinhua also said that newspaper printing requires high viscosity, low viscosity and good transmission performance inks from the perspective of printing effect, especially high-speed printing machines have higher requirements for the dryness of inks

At present, environmental protection and pollution-free have become an important prerequisite for more and more printing users to purchase ink. It can be seen that the environmental protection of ink has been widely concerned by manufacturers and users. It is understood that at present, some large ink factories have passed the ISO14000 environmental system certification. Of course, this does not completely mean that the ink they produce is really environmentally friendly ink, but at least it means that the ink factory has already had environmental awareness. For the printing factory, if the use of environmentally friendly ink will not cause the decline of print quality, and it is harmless to the workers' health, why not? But in fact, most of the environmentally friendly ink prices are high and the printing quality is unstable, so the printing factory has little demand for environmentally friendly ink

the non environmental protection of offset printing ink is mainly reflected in its smell, especially the ink. Mr. Zhu of Xinhua said, "too strong ventilation in the newspaper printing workshop will cause ink flying phenomenon, and weakening the air volume will make the ink taste too heavy in the workshop; in addition, the humidity in the newspaper printing workshop is relatively high, and at present, many inks still use mineral oil as solvent, so that the electromechanical and electrical appliances must not be affected by moisture during the liquidation of the newspaper printing car. The smell of ink and solvent is very strong, which poses a certain threat to the health of operators." But even so, newspaper printing still prefers traditional offset printing inks, because the environmental friendly inks produced at present have poor permeability due to the limitation of ingredients, which affects the drying speed and does not meet the requirements of high-speed printing. Therefore, users very much hope that newspaper offset printing ink can not only ensure the printing effect, but also be environmentally friendly. Mr. Zhu believes that the environmental protection of offset printing ink used in the newspaper industry is not ideal, which is related to everyone's indifference to environmental protection and the improvement of the performance of relevant equipment brought by newspapers. The printing factory in the newspaper industry does not have high requirements for environmental protection. It is believed that with the introduction of relevant national policies, the printing industry will have more demand for environmentally friendly inks

new ink needs to wait

at present, there are more and more varieties of special offset printing inks and new offset printing inks, among which UV offset printing inks are the most familiar ones. In the interview, we also investigated its use

uv offset printing ink is mainly used for printing gold, silver paperboard and plastic sheet base, so it is used more by packaging and printing plants, and the problems reflected are relatively concentrated. Many users do not use UV glue directly and need to keep the mold cavity at an appropriate temperature to print ink, but mix it with ordinary ink and then print on the machine. The reason is that the UV offset ink dries too fast. If the printer stops or runs slowly, it will cause the ink to scale on the ink roller

high fidelity six color offset printing is a new process pursued by modern offset printing. The high-precision six color overprint system needs to be composed of newly improved CMYK ink, Pantone hexachrome green ink and Pantone hexachrome orange ink, which can create a broader printing color gamut. High fidelity six color ink has naturally become a new focus of offset printing ink. However, we did not get information about its use from several printing plants we interviewed

from this point of view, the traditional CMYK four-color offset printing ink still has an absolute advantage, and there is still some room for development. And new offset printing ink, such as UV offset printing ink. High fidelity six color ink and anhydrous offset printing ink, in order to share the offset printing ink market, in addition to the stimulation of printing quality, the performance advantage is also the key to highlight the market

postscript of the author: from the printing factory, we learned their needs and opinions on the current offset printing ink, that is, the urgent problem for domestic ink manufacturers to solve is to constantly stabilize and improve the quality of existing products, improve the quality of raw materials and manufacturing processes for ink production, achieve high quality and serialization, strengthen communication with users, and constantly develop new products that meet the development trend of the industry while meeting the market requirements

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