The status and development trend of packaging printing liquid ink (2)

Second, the Indian plastic ink composite packaging printing process was introduced from Japan in the early 1980s. Large-scale rotary gravure printing machines are also imported from Japan, and a few come from Europe. At that time, the intaglio compound plastic ink was also supplied by the Japanese ink company. Until the mid-1980s, China had its own domestic composite ink developed. In the initial stage, chlorinated rubber was used as the main connecting material, and A-block was used as a solvent to produce composite inks. The greatest advantage of this type of composite ink is its strong adhesion and high composite strength. However, due to its large amount of residual solvents and poor printability and ink properties, it has not yet formed mass production. In the early 1990s, domestic joint venture ink companies adopted European technology and process routes, using ethylene copolymers and chlorinated polypropylene as the main binder; toluene, esters, and ketones as solvents, to produce a new generation of composite inks. . Such composite inks not only have strong adhesion, excellent printing and compounding properties, but also have a great reduction in residual solvents. After years of continuous practice and improvement, the current process route has become increasingly perfect, and has become the mainstream production process of domestic composite ink. In the middle and late 1990s, some ink manufacturers in China adopted the most advanced technology route in the world, using polyurethane as the main connecting material and esters and ketones as solvents, to produce benzene-free composite inks, which are suitable for high hygiene requirements. Printing of food, medicine and other packaging. With a specific type of polyurethane as a binder, another major category of inks produced is a retort-resistant composite ink. The printed bags require cooking at 110-130°C for 30 minutes without bleeding, peeling or cracking. . At present, the light packaging ink with chlorinated polypropylene as the route, the benzene-free composite ink with polyurethane as the route, and the two-component polyurethane-based cooking-resistant compound ink can basically meet the needs of the domestic packaging and printing industry. The quantity has become saturated and stable.
Recently, domestic ink manufacturers have developed environmentally friendly water-based composite plastic inks. Aqueous composite inks mainly include waterborne acrylic and waterborne polyamide types. In general, water-based composite inks have a certain gap in terms of dryness, ink, adhesion, etc., compared with solvent-based composite inks, but we believe that with the continuous update of new materials and new technology, In use, aqueous composite inks will eventually replace solvent-based composite inks.

Third, gravure ink printing ink Intaglio printing ink in China, first of all developed in the publishing and printing industry. In the 1950s, Beijing's Xinhua Printing Company and other companies introduced German multicolor intaglio printing presses to print publications such as the "People's Liberation Army Pictorial". Printing inks were all imported. In the late 1950s and early 1960s, Tianjin's ink production enterprises adopted the former Soviet Union's technical route and successfully developed the "Phenyl Shadow Printing Ink". This ink uses a rosin-modified alkyd resin as a binder and benzene as the binder. Solvents to produce China's first generation of gravure printing inks, replacing imported inks. The ink is mainly based on non-coated paper such as printed newspapers and stamp paper. It has the advantages of good gloss, quick dryness, and bright color, but it also has the disadvantage of poor leveling. Since the 1970s, backbone ink manufacturers across the country have successively produced "alcoholic gravure printing paper inks", which are based on nitrocellulose as the main connecting material, using ethanol as the solvent, and are suitable for printing at speeds of 30-50 meters/. The printer is printed on a gravure printer. Printing food paper such as candy paper and popsicle paper. This is the first generation of gravure printing paper ink for packaging printing in China. In the early 1990s, the printing of cigarette packs changed from offset to gravure printing, and it developed rapidly in China. Starting from Yunnan, China introduced dozens of gravure printing paper production lines from Europe, mainly packaging cigarette packets. Due to the significant increase in printing speed, a new phase of the development of gravure printing inks in China has been set off. The improved technical route of the gravure printing ink is still based on nitrocellulose as the main connecting material. Alcohols, esters and other solvents are used to improve the drying speed of the ink to 150 m/min. This ink has the characteristics of no paste, good leveling, excellent transfer performance and thick color. Previously mainly printed uncoated paper, now mainly printed coated paper. In order to improve the printability of printing inks, it has developed towards the lithographic printing. Now domestic ink manufacturers have developed standard four-color printing inks to meet the needs of printing companies. At present, the varieties of gravure printing inks are still increasing and the quality is still rising.

Fourth, the soft version of water-based ink people in the earlier time for the production and application of water-based ink. Especially since the 1970s, due to environmental protection requirements and the shortage of petroleum raw materials, people have started to research non-solvent inks, and water-based inks have made great progress. In the beginning, dextrin, shellac, casein, and sodium natrium were used as binders to produce water-based gravure inks for general books, magazines, and corrugated papers. Their gloss and water resistance were poor, and the printing effect was not good. ideal. In the 1980s, with the development of materials science, the production of water-based inks using male-modified rosin as the main binder has become the mainstream. In the same period, domestic printing companies introduced more than a dozen flexo-printed carton production lines, and ink production companies provided them with a flexo-based water-based ink. However, the primary products of these inks still have the disadvantages of poor gloss, blistering, and poor thermal stability. Since the 1990s, China has imported nearly 100 sets of combined narrow flexographic printing presses from Europe and the United States, which has played a role in the development of water-based inks. The newly introduced production line is not like the previous flexo carton printing machine printing only the block version, but the machine has added the screen printing version. The lowest cable version of the cable has reached 150 lines/inch. Therefore, new requirements have been put forward for the tinting strength, transferability, water resistance, and re-dissolvability of the ink. The development of new water-based inks is a top priority. Since the late 1980s, domestic ink manufacturers in Tianjin, Gan Valley, and Hangzhou have developed water-based flexographic inks using acrylic solutions as a binder. In the late 1990s, water-based inks also used acrylic emulsions or colloidal dispersions as the connecting material production process, making China's water-based ink into the stage of upgrading. The quality of the ink and the quality of the solvent-based ink are almost the same, and the ink is non-toxic and non-flammable. It is green and environmentally friendly. The packaging of food, medicine, and cigarettes is the preferred ink.