A large amount of organic solvents are used in flexo printing and compound processing of flexible packaging. The volatilization and direct discharge of organic solvents are the main reasons that endanger the health of operators and cause environmental pollution, and are also the bottlenecks in the development of flexo printing.
Environmental pollution and occupational injuries in gravure of flexible packaging, technology development forecast
Today, with the growing voice of environmental protection, flexible packaging color printing companies must face reality, work hard on energy saving and emission reduction, environmental protection and resource recycling to achieve green printing of flexible packaging gravure printing.
1. Organic solvent recycling
At present, some large-scale flexible packaging companies in the industry have begun to recycle their organic waste gas, mainly including regenerative catalytic combustion method and adsorption recovery method. Among them, the adsorption recovery method not only solves the problem of organic waste gas emissions polluting the environment, but also turns waste into treasure, recycling the recycled solvent, saving a lot of solvent procurement funds. In 2008, organic solvent recovery technology has emerged in the flexible packaging industry, and I believe it will be rapidly developed and promoted in the next few years.
2. Benzene-free gravure ink and water-based gravure ink
The use of benzene-free gravure inks and water-based gravure inks can eliminate the problems of benzene-soluble gravure inks on the human body and the effects of solvent residues on the quality of built-in foods and medicines, which is conducive to accelerating the environmental protection process of flexible packaging gravure printing. At present, all or most of the products of flexible packaging enterprises such as Amco, Alcoa, Baijiang, Zijiang, Nanfang Packaging, and Dalian Dafu have achieved benzene-free, and some products use water-based gravure ink. However, due to the problems of poor adhesion fastness and slow drying speed when the water-based gravure ink is printed on the film, its application in flexible packaging gravure is restricted, and further improvement and improvement are needed in the future.
3. Solvent-free compound process
The solvent-free compound process does not have the problem of organic waste gas emissions. It does not require large and complicated heating blast and waste gas exhaust devices. The equipment is simple and energy consumption is saved. Therefore, it will be the main direction of the future development of flexible packaging compound processes. At present, the application of solvent-free compound technology in China is still relatively small. There are only about 40 solvent-free compound production lines in the country. However, from a long-term perspective, with the increasingly strict environmental protection regulations and the continuous development of China's economy, the solvent-free compound process will be welcomed. Come a period of great development.
4. Recycling of composite flexible packaging waste
The variety of raw and auxiliary materials used in composite flexible packaging, and the packaging structure of different products are ever-changing, resulting in a messy type of composite flexible packaging waste, and screening is very difficult. Moreover, the bonding strength between the base materials of the composite flexible packaging is high, and it is difficult to separate by the general method. Therefore, the recycling of the composite flexible packaging waste is relatively complicated, which is also one of the current bottlenecks in the recycling of composite flexible packaging waste. At present, there are a variety of recycling methods for composite flexible packaging waste in China, such as thermal decomposition recovery technology, chemical separation technology, dissolution separation technology, hydraulic separation technology, infrared separation technology, etc.
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