Talking about the application of synthetic adhesive in packaging and printing industry
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At present, China's adhesive production enterprises have reached more than 1,500, more than 3,000 varieties, has become one of the fastest growing key industries in China's chemical industry. Synthetic adhesives have many characteristics such as wide application, easy to use, high economic efficiency and rapid development. With the development of economy and the advancement of science and technology, it will be more and more people's attention and become a promising industry. In China, we started to produce on a large scale, starting in 1958. In the 1980s, the development of adhesives culminated. However, the synthetic adhesive industry in developed countries has entered a highly developed stage. The average growth rate in the 1990s was around 3%, and the average growth in China was 19.5%. In 1998, global synthetic adhesive sales amounted to approximately US$25 billion, of which the United States accounted for approximately 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 other accounts for 10%.
It can be seen from the application structure of the adhesive that the packaging industry is the largest industry for adhesive applications. It is widely distributed in various fields of paper products, printing and decoration, plastics and other packaging industries. At the same time, with the development of the adhesive industry, it also improves the packaging products. Quality and grade have promoted the development of the packaging industry.
First, For cartons and cartons
The carton and carton production industry is the industry with the largest amount of adhesives in China. At present, there are about 15,000 carton and carton manufacturers in China. When the carton and carton are initially produced, the soda base binder is used. Because the saponin binder is easy to return to moisture and efflorescence, the bonding strength is low, and the carton and carton used for bonding are easy to be deformed and discolored. Therefore, as early as 1985, the country has banned the use of starch. Agent or other binding agent of equivalent effect.
At present, in addition to the low-grade box using the soda base adhesive, the high-end carton and carton automatic production line has all used starch adhesive or other equivalent adhesive. The production technology of starch adhesives has also been continuously updated, from the heating production in the 1980s to the current production of cold water; from the earliest colloid (liquid) to various types of solid rubber powder, adhesive making technology The improvement greatly facilitates the production of cartons and cartons, and the drying speed of the carton carton has grown from more than 40 hours to more than one hour now. Initially, starch adhesives were only used in the production of high-grade cartons. Nowadays, they can be used to produce cartons of various grades. The advancement of non-condensed starch gel technology has played a key role in the development of China's carton and carton industry.
Second, packaging and printing
In order to achieve the purpose of beautifying packaging, the film should be coated on the printed matter. Under the premise of not changing the original tone of the printed matter, the film can be made more lustrous and more dazzling, and can be protected from moisture, dirt and abrasion. Thereby effectively protecting the inner layer. The adhesive and film coating industry for laminating is also constantly evolving. Solvent-based or emulsion-based adhesives such as E-VA, polyurethane, polyacrylate, rubber, and polyester are usually used. Glue is an organic solvent-based adhesive. The solvent used is generally toluene, ethyl acetate, solvent oil, etc., accounting for more than 60% of the total amount of adhesives. Therefore, it not only pollutes the environment, endangers the health of workers, but also may cause fires during operation. With the emphasis on environmental protection at home and abroad, printing companies are encouraged to choose adhesives that meet both quality and environmental requirements.
Water-based paper-plastic composite adhesive with water as medium, has strong adhesive force, non-toxic, odorless, non-burning, no waste, safe use, high transparency and high gloss, plus it is safe to use for workers. It has no damage and no pollution to the environment, so it has been well received by the printing industry. It has been widely used in the fields of packaging and printing, book printing and so on.
Third, pressure sensitive adhesive and pressure sensitive tape
The production and application of pressure sensitive adhesives and pressure sensitive adhesive tapes have also recently developed. In 1996, China sold 2.26 billion m2 of tape, most of which was packaging tape (2 billion m2). After entering the 1990s, the production technology of domestic pressure-sensitive adhesives has gradually developed towards comprehensive development. The United States, Japan and other countries have successively established wholly-owned or joint ventures in China, which has promoted the technical level of pressure-sensitive adhesive products in China to a certain extent. improve. For example, in the production of double-sided tape, it has been possible to use acrylate soft monomer solution copolymer resin, and use various cross-linking agents to produce pressure-sensitive adhesives and products with excellent performance in the form of diplomatic joints; for example, in the development of hot melt Pressure-sensitive adhesive products and radiation-curing pressure-sensitive adhesives have also borrowed from foreign advanced technologies, and many companies have been able to produce them on a large scale.
In China, the development and production of high-performance special pressure-sensitive adhesives, such as high-strength protective tapes for automobiles, strong adhesive performance tapes for lifting, high-temperature and high-insulation special tapes, etc., need to be further strengthened and need to be improved.
In addition to the above types of adhesives, other packaging adhesives in China, such as label labels, paper-plastic sealing adhesives, cigarette adhesives, and paper tube adhesives, are constantly being updated with the development of various production technologies.
Although China's packaging adhesives have achieved remarkable development in the past decade, there are still some gaps with the world's advanced level in many aspects, mainly: varieties and quality can not fully meet the requirements, many varieties still need to be imported; application technology research work can not keep up New varieties development requirements; production equipment is backward, low-level repetitive varieties are still many, there are no systematic countries, industry materials and testing methods.