China's plastic packaging materials, especially soft food and pharmaceutical composite packaging materials, have developed rapidly in the past 20 years. Not only are there many manufacturers, but also the variety of products, the quality has reached a certain level. However, in the process of rapid development of the packaging industry, we have focused our attention on scale, output, physical and mechanical properties, high and low temperature resistance requirements, and media erosion resistance, but we have not paid enough attention to the hygiene and safety performance of the packaging materials themselves. . Therefore, many manufacturers of composite packaging materials have some unhygienic and unsafe hidden dangers in the procurement and use of raw and auxiliary materials, the improvement of production conditions, and the detection of finished products; many food and drug manufacturers use The packaging materials have not been carefully considered in terms of the impact on the packaging and the health and safety of the human body. They only pay attention to fastness, strength, appearance and price, and care about the presence of odor at most.
Generally speaking, in the past, little attention was paid to the packaging materials on the health and safety of food and drugs and the potential impact of packaging materials on the global environment. Therefore, the hygienic safety quality of China's packaging materials is still far from the world's advanced level. In the past two to three years, the state has supervised and inspected the health and safety issues of food itself, implemented the assured food project, and implemented the QS certification and market access system. Since June 2005, the health and safety issues of food packaging materials have been supervised and tested. The media exposed some incidents of excessive benzene in food packaging bags, which has aroused great concern of the whole society. This is an important measure for the Chinese government to implement people-oriented and protect the safety and health of consumers, and it is a manifestation of social progress.
Most of the inks printed on composite packaging bags are organic solvent-based gravure inks containing methylbenzine and xylene. Among them, two aspects are closely related to food hygiene and human health:
The first is benzene solvents. It is not allowed to use in the GB-9685 standard, but the actual situation is still widely used, which is very undesirable. The boiling points of toluene and dimethyl stupid are over 110 ℃. During the printing process, the drying temperature is only 70 ℃ -80 ℃, rarely exceeding 90 ℃, and the speed is very fast, up to 150 meters or even 250 meters per minute, the solvent cannot After being completely removed, there will always be a portion left in the ink layer. If absorbed by the body, it will damage the human nervous system and destroy the body's hematopoietic function, causing typical permanent benzene poisoning symptoms such as vomiting, insomnia, anorexia, fatigue, decreased white blood cells, and decreased resistance. Luggage industry, paint industry, decoration industry, etc.) account for a large proportion.
The second is that pigments and dyes used in inks contain heavy metals (lead, cadmium, mercury, chromium, etc.) and aniline or fused ring compounds.
Lead in heavy metals can hinder children's physical and intellectual development. Mercury can have a harmful effect on the body's nerves, digestion, endocrine system and kidneys, especially for fetuses and babies. It can also damage the human brain and cause death. Cadmium can cause bone damage, and aniline or fused ring dyes are obvious carcinogens, which pose a great threat to human health. Therefore, the harmful substances in the printing ink of packaging bags have obvious and serious impacts on food hygiene and human health. In addition to base films and inks, the hygienic safety of compound adhesives is equally important. In the GB-9685 standard, only maleic anhydride modified polypropylene and polyurethane adhesives are allowed to be used in food packaging, while single-component pressure-sensitive adhesives using benzene as a solvent are not allowed.
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