Adhesives have really begun to produce with scale in our country, starting from 1958. In the 1980s, the development of adhesives had a climax. At present, there are more than 1,500 adhesives production enterprises in China, with more than 3,000 varieties, and it has become one of the fastest-growing key industries in China's chemical industry. The synthetic adhesive industry in the developed countries of the world has entered a highly developed stage. The average growth rate in the 1990s was about 3%, and the average growth in China was 19.5%. In 1998, global sales of synthetic adhesives were approximately 25 billion U.S. dollars, of which the United States accounted for about 35% of global sales, western Europe accounted for 25%, Japan accounted for 15%, and China accounted for only 7%. The global synthetic adhesive consumption structure accounts for 35% of the packaging industry, the construction industry accounts for 25%, the wood processing industry accounts for 20%, the automobile transportation industry accounts for 10%, and the others account for 10%.
From the adhesive application structure, it can be seen that the packaging industry is the largest industry for adhesives. It is widely distributed in various fields such as paper products, printing and decorating, plastics, and other packaging industries. At the same time, with the development of the adhesive industry, packaging products have also been improved. Quality and grade promote the development of the packaging industry.
First, adhesive for carton and carton
The cartons and cartons production industry is the industry with the largest amount of adhesives in China. At present, there are more than 15,000 cartons and cartons manufacturing enterprises in China. When the cartons and cartons were produced for the first time, scouring alkali adhesives were used. Due to the fact that scouring alkali adhesives are easy to return to moisture and efflorescence, the adhesive strength is low, and cartons and cartons bonded with them are easily deformed and discolored. Therefore, as early as 1985, the state has banned the use of starch sticks. Mixtures or other binders with the same effect.
At present, in addition to the use of scouring alkali adhesives in low-grade boxes, starch adhesives or other equivalent adhesives have been used in the automatic production lines for high-grade cartons and cartons. Starch binder production technology has also been continuously updated, from the heating production in the 1980s to the current cold water production; from the earliest development of colloids (liquids) to various types of solid rubber powders, adhesive production technology has greatly improved Convenient for the production of cartons and cartons, the drying speed of the carton cartons has been developed from the original more than 40 hours to the current one more hours to enter the next process. Initially, starch binders were only used in the production of high-grade cartons. Today, they can be used to produce various grades of cartons. Progress in non-denatured starches has played a key role in the development of the cartons and cartons industry in China.
Second, packaging and printing adhesive
With the improvement of peopleâ€™s living standards, there are higher requirements for packaging, especially sales packaging, such as the exquisite packaging of cigarettes, wine, medicine, and cosmetics that we see. In order to achieve the purpose of beautifying the packaging, the film should be coated on the printed matter. The film can increase the luster and make it more eye-catching without affecting the original tone of the print. It can also prevent moisture, stains, and abrasion. , thus effectively protecting the inner layer. Film adhesives and coatings are also being developed. They are usually solvent-based or emulsion adhesives such as E-VA, polyurethanes, polyacrylates, rubbers, and polyesters. Laminating adhesives are organic solvent-based adhesives. The solvents used are usually toluene, ethyl acetate, and solvent oils, which account for more than 60% of the total amount of adhesives. Therefore, they not only pollute the environment and endanger the health of workers, but also may Fire caused, with the emphasis on environmental protection at home and abroad, prompted printing companies to choose adhesives that can meet quality requirements and meet environmental requirements.
Reprinted from: Jingtao Paper Tube
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