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Reviewing the development of China's flexible packaging industry, the green wave has been further promoted in the flexible packaging industry, and sustainable development has gradually changed from the concept to the actual action of industry-leading enterprises. In this context, new materials, new processes and new equipment such as benzene free ink, solvent-free compounding, efficient drying devices, organic solvent recycling and waste recycling have been applied in the flexible packaging industry. Many flexible packaging enterprises took precautions in 2009 and actively carried out technological upgrading. Therefore, almost all flexible packaging equipment suppliers ushered in a small peak of development in 2009

the trend of continuous growth has not changed. On the basis of the original emphasis on quality and efficiency, China's flexible packaging industry pays more attention to energy conservation, consumption reduction, emission reduction and safety (personal safety, labor safety, food safety, drug safety, etc.). The new business philosophy urges more flexible packaging enterprises to gradually move towards norms and undertake more social responsibilities

new development of soft packaging industry technology

like other packaging, soft packaging should consider the three elements of packaging, namely, safety, convenience and aesthetics (display and promotion). After more than 20 years of development, China's flexible packaging industry has made great progress, especially in the aesthetics of flexible packaging has reached the world leading level. However, in terms of the safety of flexible packaging, there are still some problems in China's flexible packaging industry, which need our continuous efforts. Judging from the current market situation, with the single development of the new generation of functional beauty solutions, the batch of orders is getting smaller and smaller, and the printing version is changing more and more frequently; On the other hand, the price of crude oil is rising, the prices of various raw and auxiliary materials are also high, the labor cost is rising year by year, the profit space of the flexible packaging industry is further compressed, and the cost pressure is increasing. Therefore, new technologies, processes, equipment and materials in China's flexible packaging industry will develop rapidly in the direction of environmental protection and safety, energy conservation and emission reduction, cost reduction, waste reduction, efficiency improvement and yield improvement

1. Benzene free ink and general-purpose ink

in order to meet the strict requirements for the amount of residual solvents in a series of new national standards, the use of environmentally friendly benzene free ink is a top priority for flexible packaging enterprises. Because for most flexible packaging enterprises, if they still use chlorinated polypropylene inks containing benzene, it is difficult to control the process only. The industry is still facing "green difficulties" that need to be solved to meet the relevant requirements. The use of benzene free ink can not only effectively eliminate the residue of benzene solvents, but also greatly reduce the residue of ethyl acetate, which is conducive to the overall control of the total amount of solvent residues. Therefore, major ink suppliers have launched benzene free and ketone free inks. This kind of ink does not contain aromatic hydrocarbons and ketone solvents, and has the characteristics of low odor and high ink brightness, which can help improve the competitiveness of gravure printing in the field of packaging and printing. In addition, benzene free inks with chlorinated polypropylene modified resin as binder have also been widely used because of their low cost, simple use, and the special requirements of extrusion compounding for inks. Due to some unsolvable problems of alcohol water system composite inks, the application of color inks has been slow, except that white inks have been widely used

kinds of inks correspond to a kind of substrate, and the inks between various substrates cannot be used universally, which causes problems such as the increase of inventory varieties, difficulties in management, the increase of on-site operation procedures, and the difficulty in digesting residual ink. The use of universal ink system can not only solve the problem of residual ink, but also help flexible packaging enterprises to implement color standardization management, but also effectively reduce solvent residues. Some ink suppliers such as Zhejiang New Oriental ink Group Co., Ltd. have successively launched mature environmental friendly universal ink products, which can effectively help flexible packaging enterprises reduce ink inventory

2. Solvent free compounding technology

with the introduction of relevant laws, regulations and standards, the market has put forward more stringent requirements for the health and safety performance and barrier protection performance of packaging materials, and the flexible packaging market will undergo a major structural adjustment, which provides a development opportunity for solvent-free compounding

the solvent-free composite process does not use solvents, and there is no waste gas emission problem. It does not need huge and complex heating and blowing devices and waste gas exhaust devices. The equipment is simple, the floor area is small, the energy consumption is low, and the process flow is simple. It has the advantages of low cost, resource saving, environmental protection and so on. Therefore, it will be the main development direction of the composite process in the future. At present, most medium and low-grade flexible packaging materials can be produced by solvent-free compounding, but due to the constraints of compounding quality and other factors, solvent-free compounding can not completely replace the dry compounding process

in 2009, breakthrough progress has been made in the development and application of domestic solvent-free compounding equipment and adhesives, which are gradually maturing. Domestic solventless composite equipment developed and produced by equipment suppliers such as Guangzhou Tongze Machinery Co., Ltd. has gradually been recognized by the market, and foreign well-known solventless composite equipment suppliers have also begun to set up offices in China. All these laid the foundation for the rapid development of solvent-free compounding in the domestic market. The shape of the experimental machine and various experimental parameters can be obtained through the display screen. Although solvent-free compounding is rarely used in China at present, in the long run, with the increasingly strict environmental protection regulations and the continuous economic development, solvent-free compounding will usher in a period of great development

3. In recent years, gravure printing machine has entered the era of electronic axis, and the cost of electronic axis gravure printing machine is falling sharply. Interchangeable printing carts, sleeve impression cots, and efficient drying systems have been gradually applied to help flexible packaging enterprises achieve remarkable results in energy conservation, consumption reduction, emission reduction, safety, and so on. In addition, secondary overprint technology, electrostatic ink absorption device, high-efficiency electrostatic removal device, remote diagnosis system, quality inspection system and other technologies have also begun to be applied. Gravure machine manufacturers represented by Shaanxi Beiren Printing Machinery Co., Ltd. and Zhongshan Songde Packaging Machinery Co., Ltd. actively promoted technological progress and accelerated the industrialization of scientific research achievements. A series of new technologies and achievements were widely applied to domestic gravure machines. Taking the oven drying system as an example, it is being continuously improved in the following aspects: ① improve the drying efficiency and pay attention to the control of solvent residue; ② Adopt 100% fresh air circulation + waste gas preheating fresh air, effectively utilize waste heat and save energy; ③ Control the explosive concentration of volatile organic solvent gas to ensure safe use; ④ On the premise of ensuring that the solvent residue does not exceed the standard, try to reduce the total emission of volatile organic solvent gases. When choosing equipment, the industry also pays more and more attention to the material consumption index in the printing or composite process (including normal roll changing), in order to minimize the product cost

4. Organic solvent recovery technology

organic solvents are widely used in the printing and compounding process of flexible packaging, which is an important reason for solvent pollution in the flexible packaging industry. The exhaust emission system of gravure printing machine and compound machine will emit a large amount of exhaust gas containing organic solvents, which not only pollutes the atmospheric environment, but also causes indoor pollution and safety problems due to the volatilization of organic solvents in the process of use. For many years, the flexible packaging industry has been using the high-altitude emission method to discharge organic solvent gases. Now this method has been difficult to pass the project EIA. In the next few years, the state may introduce compulsory measures to require flexible packaging enterprises to install organic solvent recovery and treatment devices, so as to reduce exhaust emissions and ensure the achievement of the national goal of energy conservation and emission reduction

under the dual effects of environmental protection policies and cost pressure, the organic solvent recovery technology in China's flexible packaging industry has been rapidly developed and promoted in 2009. Some large flexible packaging enterprises in the industry have begun to recover and treat the discharged organic waste gas (solvent), mainly using two methods

(1) adsorption recovery method: the organic waste gas produced in the production process of flexible packaging is adsorbed, reduced, purified, recycled and recycled, which not only solves the problem of environmental pollution, but also turns waste into treasure, recovers and recycles organic solvents, saving a lot of organic solvent procurement funds. The organic waste gas recovery equipment developed by Luoyang Huitong Tianbao Environmental Protection Technology Co., Ltd. is specially designed for gravure printing machines and drying machines in the flexible packaging industry. At present, it has been applied in well-known flexible packaging enterprises in the industry, such as Shanghai Zijiang, Changchun century, Henan yinlida, Haining Yuehai, and has produced good economic and social benefits

organic solvents contain impurities, which may affect the health of consumers if used directly. Therefore, flexible packaging enterprises using this technology should ensure the purity of organic solvents. In Europe, flexible packaging enterprises must be equipped with organic solvent recovery equipment before they are allowed to produce, and the recovered organic solvent must also be re distilled before it can be used

(2) regenerative catalytic combustion method: the concentration of exhaust gas produced in the production process of flexible packaging enterprises is relatively high, generally 500 ~ 5000mg/m3, so it is also suitable for the use of regenerative catalytic combustion method. After the waste gas is heated by the thermal storage ceramic body, the temperature rises rapidly to 700 ~ 800 ℃, and the organic components in the waste gas are directly decomposed into carbon dioxide and water vapor at this high temperature to form tasteless high-temperature flue gas, which then flows through the low-temperature thermal storage ceramic body, and a large amount of heat energy is transferred from the flue gas to the thermal storage ceramic body to heat the waste gas to be decomposed in the next cycle, while the temperature of the high-temperature flue gas itself decreases significantly, The temperature is further reduced through the heat exchange system and finally discharged outdoors. Heated air can be directly introduced into the drying system of gravure printing machine and compound machine, which can save a lot of energy. Using regenerative catalytic combustion method, although the calorific value of combustion has been fully utilized, the organic solvent has not been regenerated, and a large amount of carbon dioxide will be produced, which will aggravate the greenhouse effect to a certain extent

in addition to the above two commonly used organic solvent recovery technologies, new organic solvent recovery technologies are also developing and making breakthroughs. It is reported that Shunde Debao company adopts the latest generation of heat pump technology, using the evaporator end of the heat pump to condense the high-temperature exhaust gas discharged, and collect the organic solvent from the gaseous state to the liquid state. The treated air with lower water content and no dust can be reheated through the radiator end of the heat pump, and can continue to be used for the drying of products. In this way, over and over, the organic solvent can be almost 100% recycled through the recycling of heat energy, The energy consumption is reduced to 30% of the original, achieving real zero emissions. This technology is different from the adsorption recovery method, and solves the industry problem that it is difficult to recover heat energy and organic solvents in a large proportion at the same time

5. Thermal transfer technology using gravure printing

in recent years, thermal transfer technology has achieved great development and is widely used in the surface decoration of daily necessities, stationery, cosmetics, electrical appliances, toys and other products. The heat transfer technology of gravure printing is used, that is, the pattern is first pre printed on the film surface by gravure printing, so the printed pattern has rich layers, bright colors, small color difference, and is suitable for mass production; After that, the exquisite patterns on the transfer film are transferred to the surface of leather, textile fabric, plexiglass, metal, plastic, crystal, wood products, coated paper, stainless steel and other materials through one-time processing (heating and pressing) by the heat transfer machine. After forming, the ink layer is integrated with the material surface, which is realistic

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