Packaging adhesive (2)

6. For a long period of time, the adhesion persistence compound must maintain a high level of adhesion fastness (ie, peel force). It cannot be high in one week, and then decreases in two weeks, two or three. After the month becomes unqualified. 5 years ago, most of the domestic plastics had the phenomenon that the peeling force gradually declined with the passage of time. With the appearance and use of functional adhesives, this problem has been solved theoretically and practically. At present, only If you choose functional glue, you won't have to worry about this.
7, health and safety. This is an issue that is very important but is not being taken seriously. Food is an indispensable thing to maintain life and continue to live. We eat three meals a day, every day, every year, every year, and medicines are necessary for healing and restoring health. In modern society, people regard health as the first important, only health, life is sound, life is happy. Therefore, if the adhesive in the packaging material is not hygienic and safe, it contains components that are harmful to human health, penetrates into the contents of the package, and contaminates the food or drug, it will endanger human health. Such packaging materials will The purpose of maintaining life and curing diseases runs counter to it. The health and safety of packaging materials, all countries in the world have strict regulations and vigorous monitoring. The Ministry of Health, the Hygiene Supervision and Inspection Institute, the Institute of Preventive Medicine, the Customs, and the industry and commerce departments all have dedicated personnel to perform this task.
After China's accession to the WTO, all walks of life said that it must be in line with international standards and must follow the internationally accepted rules of the game. People can come in and we can also play it out. Everyone has equal opportunities and competes on the same starting line. However, it is not that simple to truly integrate with the international community! According to the Ministry of Foreign Trade and the Ministry of Health, in the first half of this year, nearly 60% of China's exports of vegetables, fruits, aquatic products and processed foods have been investigated and punished because of unsatisfactory hygiene and safety, and they are not allowed to enter the ports and economic losses. It is self-evident that even more inestimable is the blow to the credibility of China's product quality and health and safety. It is said that these health problems are caused by contamination of the contents with pesticide residues, chemical fertilizers, hormones in feed, food additives, and harmful ingredients in packaging materials. Therefore, the Ministry of Agriculture and the Ministry of Foreign Trade are taking urgent measures to grasp foods. Health, promoting green agriculture and safe food, we engage in packaging materials, should also actively cooperate with, do a good job, improve the health and safety performance of packaging materials, for the protection of export products.
Second, the domestic production of adhesives and the use of adhesives
Since China began to build its first set of polyurethane adhesives for food packaging since 1984, especially since the 1990s, manufacturers of adhesives have mushroomed and developed rapidly. So far, according to incomplete statistics of professional committees, the number is about 300. The total production capacity including single-component pressure-sensitive adhesives is nearly 100,000 tons per year. Among so many manufacturers, only the Beijing Chemical Research Institute has really introduced technology, and several other companies claim that the introduction of technology and production are all for advertising purposes. Of all these manufacturers, there are few real independent intellectual property rights and development and research capabilities, and the number will not exceed 10, and more than 98% of the manufacturers will use specific methods to obtain specific technologies. .
Therefore, their products tend to have problems of single varieties and unstable quality, especially because the basic knowledge is not solid enough. When they write articles, product specifications, or exchanges, they often make some innocent people look They come from low-level mistakes, and when they sell products to compound packaging material manufacturers, they say, "Our quality is exactly the same as that of a certain company." or "Our technology is exactly the same as that of a certain company." One side reflects the technical level of these units! Similarly, since the development of the modern composite flexible packaging material industry in China in the early 1980s, the color printing composite materials manufacturing plant has also developed rapidly. To date, there are more than 2,500, and 30,000 to 40,000 tons of adhesives are used every year to make composite packaging materials. About 90% of the adhesives to be used are supplied by domestic production, and about 10% of special specifications are provided by foreign manufacturers. From the above comparison of production capacity and consumption capacity, the domestic adhesive has formed a pattern far beyond demand, resulting in a vicious circle of adhesive manufacturer's under-employment, overstocking of product inventory, and then the use of lower prices to sell, seize the market, also Inevitably there are some negative problems that do not hesitate to reduce the level of product quality and shoddy. (To be continued)

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