Characteristics and development prospects of the h

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Characteristics and development prospects of vegetable inks

inks are the main consumables in the printing industry. They can be divided into many types according to the composition and content of inks, the purpose of substrates, printing equipment, printing methods and use methods. Most of the existing inks contain organic (or inorganic) solvents, pigments, etc., which do not meet the requirements of environmental protection and green printing. Nowadays, with the improvement of people's awareness of environmental protection and the growing voice of environmental protection, ink, as the main component of green printing, has increasingly enhanced its environmental requirements, and the amount of printing ink suitable for environmental protection is increasing year by year. Environmental protection has become the only way for the development of ink in the future. Now let's talk about the characteristics and applications of green and environmentally friendly vegetable inks

vegetable ink is vegetable oil-based ink, which uses vegetable oil as connecting material. At present, the connecting families developed and applied mainly include alkali refined soybean oil, rapeseed oil, cottonseed oil, sunflower seed oil, safflower seed oil and canoia oil, among which the most commonly used is soybean oil-based vegetable ink. Vegetable ink is mainly made of pure natural vegetable color paste, natural vegetable oil water and some additives. Its advantage is that it can not only reduce the release of volatile organic compounds, but also the pigment slurry does not contain any heavy metals, which is harmless to human body. Vegetable ink completely removes the hydrocarbon resin in ordinary ink and reduces the amount of pigment, which is enough to be used as a substitute for petroleum based ink. The thermosetting and quick drying offset printing inks synthesized from rapeseed oil and sunflower oil modified alkyd resin are replaced by mineral oil with fatty acid methyl ester derived from vegetable oil, but the performance of thermosetting offset printing inks needs to be improved and perfected; In addition, there are many lithographic intaglio inks with vegetable oil as the main component. In these products, vegetable oil is modified as resin or solvent, which effectively reduces the content of v0c. However, in order to ensure the printing performance, there will still be a certain amount of petroleum resin or solvent. It is believed that with the deepening of research, the amount of these petroleum resins or solvents will gradually decrease

plant ink has a wide range of applications, and can be applied to the printing of various trademarks, self-adhesive labels of newspapers and magazines, beverages, alcohol, drugs and various cosmetics in soft packaging boxes and bags, sanitary products packaging, fast food lunch boxes, shopping bags, paper cups and cigarette boxes. In addition, plant ink will not cause friction and electrification, but also emit natural flavor. The diversified characteristics of plant ink in technology and application make it an environmental friendly ink with a wide application prospect. Taking soybean oil ink as an example, it has better technical characteristics than ordinary petroleum ink, thus forming a more extensive and novel ink application market. To sum up, vegetable inks mainly have the following characteristics

1. technical features

① excellent environmental protection

ordinary petroleum based inks contain a large number of volatile organic compounds harmful to human body. During ink manufacturing and printing, drying process, equipment cleaning and waste ink treatment, a large number of organic components volatilize, which not only seriously endanger the health of production operators, but also cause great damage to the environment, For example, the volatile organic compounds contained in v0c petroleum based ink are one of the strongest carcinogens, which seriously endanger human health. However, the content of polycyclic aromatic hydrocarbons in plant inks is low, so they basically do not emit VOC when used, and will not pollute the environment, which is conducive to the health of manufacturers and users. In addition, the oil used in ordinary inks is a non renewable resource, and the energy crisis caused by large-scale use has become a serious problem faced by mankind. However, vegetable inks, such as soybean oil, are naturally extracted, which can be infinitely regenerated and biodegradable. Therefore, whether from the perspective of resource utilization or environmental protection, vegetable inks have incomparable advantages over ordinary inks

② good friction resistance

prints printed with ordinary petroleum based ink (such as newspapers) have poor friction resistance. Usually, when reading, the printing ink on the newspaper is easy to blacken the reader's hands, and often feel the presence of petrochemical odor volatile components in the ink, affecting the reader's health. The newspaper printed with soybean ink is generally welcomed by readers because it is relatively friction resistant, so readers are not troubled by black hands when reading. At the same time, it has no bad stimulating smell. In addition, the boiling point of vegetable ink is much higher than that of petroleum volatile components. When it needs to be heated for printing (such as laser printing, copying, etc.), it will not stick to the paper because of volatilization, which is also the feature that vegetable ink is significantly better than ordinary ink

③ the deinking of waste paper is easy and the damage of paper fiber is less

according to the research, for the deinking of recycled waste paper, soybean ink is easier to deink than ordinary ink, and the damage of paper fiber is less. At the same time, the waste ink residue after deinking is easier to decompose than the oil-based ink (because the soybean oil system is biodegradable, while the oil system is biodegradable), which is conducive to the drainage treatment operation. This characteristic of soybean ink is a very favorable factor for waste paper recycling (recycled paper)

④ more printing volume

because soybean oil ink can show a thicker and brighter color effect, printers can use less ink. The cost is reduced and the unit printing volume is increased by about 10% - 15%

⑤ the color is deep, rich and bright, which is suitable for a wide range of color printing. ⑥ Non toxic

soybean ink is non-toxic because it does not contain organic volatile harmful components such as aromatic polycyclic hydrocarbons, which is conducive to environmental protection

⑦ good laser resistance

when printing materials need laser resistance, soybean ink is the best choice. Its boiling point is much higher than that of petroleum volatile components. When the ink is heated by a laser printer or copier, it will not volatilize and stick to the paper, nor will it pollute the parts of the printer

2. Application characteristics

unlike petroleum inks, vegetable inks are non renewable resources. For example, soybean oil contained in soybean inks is a rich resource of sustainable regeneration and biodegradable. It can provide raw materials for ink production continuously, and has good environmental protection. Using vegetable oil (such as soybean oil) to replace some petroleum mineral oil to make ink can promote the industrial utilization of vegetable oil in various countries, expand the application scope of vegetable oil, reduce the consumption and import of non renewable oil, and save foreign exchange. It can be said to be a plan to kill with one stone

3. Main types of soybean inks

due to different printing methods and substrates, soybean inks with different formulas need to be used together, just as gasoline cannot be applied to diesel engine vehicles. Therefore, soybean ink also needs to develop a variety of formulas for different printing situations. At present, there are mainly the following kinds: ① newspaper ink: newspaper printing using web printing. It is an absorption reaction that makes the oil in the ink absorbed by the paper and leaves the printing color on the surface of the paper to complete the printing. This kind of newspaper ink has a high oil content (soybean oil). Generally, the oil content of black ink is at least 40%, and that of color ink is at least 30%. ② Sheet fed ink: this kind of ink contains more resin components, while vegetable oil is at least 20%. ③ Thermosetting ink: low oil content, at least 7%. ④ Cold set ink: oil content of at least 3O%. ⑤ Commercial form printing ink: oil content shall be at least 20%. ⑥ Relief ink: This is an ink based on water or solvent. It does not contain vegetable oil such as soybean oil, but contains vegetable protein (such as soybean protein). It can make the pigment adhere to the paper to complete printing. Generally, the protein content is i5% - 20%

the rise of vegetable ink originated from the global oil crisis in 1979. At that time, the oil price continued to soar, affecting related industries, including the printing industry. The supply of oil has brought some problems, especially the ink industry is very sensitive to the market supply problem. In order to alleviate the impact of the oil crisis on the printing industry and avoid the impact of raw material supply on production. The head of the American newspaper Printers Association (now the American Newspaper Association) advocates promoting the development of printing inks that replace petroleum substrates. After years of research and testing on a variety of vegetable oil formulas, the results show that soybean inks are non-toxic and pollution-free. Moreover, the soybean oil used for cooking is rich in output, cheap, safe and reliable. The printing effect is good and meets the standards and specifications of printing inks, especially the superior environmental performance. Finally, soybean oil-based vegetable ink was selected to manufacture. It was printed successfully in 1987, so that soybean ink can be applied in the newspaper industry after being decelerated by the deceleration system. It can be said that the application of soybean ink is the newspaper industry. There are about 10000 newspapers in the United States, of which 1/3 have used soybean ink, especially more than 90% of the larger 1500 have confirmed its effect and adopted soybean ink. Most newspapers use soybean ink for color printing, and because the price of color soybean ink can compete with petroleum color ink, its printing effect is excellent, the color is very bright and environmental protection is good. In the long run, black soybean ink has a strong competitive advantage in newspaper printing because of its good printing effect and high efficiency (if more copies are printed, the cost can be reduced). In addition to newspaper printing, soybean ink can also be used in other printing, such as sheet fed ink, thermosetting ink, cold setting ink, commercial form printing ink and relief ink. In thermosetting printing, vegetable inks can avoid environmental pollution caused by the volatilization of v0c, and give prints a thick and bright appearance in color printing, so they are recommended by the American Newspaper Association

in recent years, the call for green printing has become increasingly louder, and the advantages of soybean ink have become increasingly prominent. Whether it is to protect the environment, reduce dependence on imported oil, or to ensure sustainable production and renewable resources, advocating the use of soybean oil ink can achieve the goal. The United States, Japan, South Korea and other countries have vigorously promoted the use of soybean ink. At present, 230 ink factories in Japan are engaged in the production of soybean ink and have been used by 75 units. The new environmentally friendly sheet fed offset printing ink "OPI s1o0" recently launched by Osaka printing ink company in Japan is a kind of soybean ink recognized by the American Soybean Association. It can be said that vegetable ink (soybean ink) will be one of the best choices of environmental friendly ink in the future, and its development prospect is very broad

in 2005, Canon (China) grandly launched imageprogramafw8400/w6400 series of two models and four types of new large format inkjet printers for the graphics and imaging industry, leading a new trend in the printing industry "New storm.

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Canon w8400/w6400 series printer not only inherits the high-speed, high-quality dual performance that Canon imageprogram I is proud of, but also adopts Canon's unique large-size, high-density nozzle fine print head technology (1.07 inches) to create a high-density multi nozzle print head (1280 on the other hand, technically more complex dynamic machines and advanced static experimental machines are seriously short of x6=7680 nozzles) as well as a new type of printing head with built-in 4p1 (microliter) ultra fine ink droplets and a new type of image processing system, which greatly improves the printing quality. The unique "PG color ink" of Canon is used. While giving full play to its excellent light and water resistance and the following information, we have a detailed understanding of the color stability, which is comparable to the dye ink

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