The most popular green flexible packaging strong b

2022-08-06
  • Detail

Green, flexible packaging strong breakthrough (II)

at present, degradable plastics mainly include complete biodegradation, incomplete biodegradation, photodegradation, biological and photodegradation. Fully biodegradable plastics can eventually be digested into powder by themselves. There are two types: biosynthesis and artificial synthesis. At present, only fatty polyester polymerized through microbial fermentation, such as PHB (polyhydroxybutyrate) and PHBV (Polyhydroxybutyric acid and hydroxybutyric acid copolyester), has low strength and little use, but it is completely harmless to the environment because it can be completely degraded by microorganisms, Therefore, it is still concerned by countries in the development of packaging materials; Synthetic polyamide (protein structure, such as nylon), polyurethane (made into film), polyvinyl alcohol PVA (film, also water degradable), polymer containing ether bond, etc., which can be completely degraded by microorganisms, have been used as packaging film, packaging container or binding material, but their use is limited due to high cost. At present, incomplete biodegradable plastics are the most widely used biodegradable plastics in China, mainly pe+ starch. Starch needs to be modified. The surface of modified starch particles is covered by alkyl, which weakens the role of hydrogen bond, thus increasing the compatibility of starch and polymers, so that it can be used for blending or grafting modification of polymers. The green requirements for flexible packaging production process and production process are an effective method to realize the sustainable development of flexible packaging industry and ensure the physical and mental health of operators

the compounding methods of flexible packaging products are generally dry compounding, solvent-free compounding, single-layer extrusion compounding and coextrusion extrusion compounding. From the aspects of environmental pollution, energy loss, product solvent and harmful substance residues, and food pollution caused by binder in the compounding process, coextrusion extrusion compounding is a complete green compounding process. The adhesive layer of CO extrusion composite has no toxicity and no harm; No residual solvent; No exhaust gas pollution; Because there is no drying oven, the energy consumption is also low; The composite production cost is low and the thickness of the extruded bonding layer is small. As the extruded substrate is cheap and the bonding layer also takes up a certain thickness, the production cost is actually very low. Recycling of waste plastics is an important way to alleviate the environmental pollution of flexible packaging. Green packaging is divided into class A and Class AA. A-level green packaging refers to appropriate packaging that can recycle, recycle or degrade wastes and contains toxic substances within the specified limit. AA grade green packaging refers to appropriate packaging that wastes can be recycled, recycled or degraded, and do not cause public hazards to human body and the environment in the whole life cycle of the product, with toxic substances within the specified limit. This classification mainly considers to first solve the problem of waste after packaging, which is the pollution in the process of environmental protection around the world. It is a problem that needs to be solved in the past, now and in the future. In 2003, the output of plastic products in China exceeded 25million tons, and maintained a strong growth momentum in 2004. If 20% of the plastic products are recyclable plastics, the recyclable plastic waste is about 4million ~ 5million tons per year, which does not include the recycling of leftover materials and unused defective plastic products

according to the Tenth Five Year Plan for recycling and utilization of renewable resources, China will recover 5million ~ 6million tons of waste plastics by 2005. However, China only recovered more than 2 million tons of waste plastics last year. According to statistics, about 14million tons of waste plastics are not recycled every year in China, and the recycling rate is only 25%. The direct waste of resources is as high as 28billion yuan/year. Director of the science and Technology Committee of China Association for packaging industry Professor daihongmin of Chongqing University of technology and industry pointed out: "There are two main ways to make flexible packaging green: one is to recycle packaging waste in order to save resources and protect the environment. There is a huge space for the development of waste plastic recycling in China, and there is an urgent need for industry norms. The other is to use green packaging materials that are easy to degrade by themselves. At present, most plastic flexible packaging is made of non degradable plastics, which can not be degraded in nature after being used and discarded, so it is difficult for cities Railways and rivers cause dazzling pollution. Therefore, in order to promote the greening of flexible packaging, especially plastic packaging, all countries attach great importance to the research and development of green packaging materials, and have made or are making many important achievements. " It can be seen that the green environmental protection of flexible packaging should start from many aspects. In order to achieve the green environmental protection of each step of material, process and finished product recycling, there must be a set of effective schemes. This is also the reason why the industry has called for the introduction of environmental protection laws in line with international standards in recent years

it is often dangerous to make judgments and decisions on environmental issues based on common sense in "calling for the green spring of soft packs". Because people generally can not see all the links in the whole life cycle of a product (or service). The subjectivity and blindness of decision-making can be avoided only by insisting on the penetration of future digital technology, network technology and intelligent technology, integrating into the whole process of product R & D, design and manufacturing, and investigating the total impact on the environment in all links of the whole life cycle. According to the definition of the international organization for Standardization ISO, the internationally popular life cycle analysis method is a method to summarize and evaluate the environmental impact and potential impact of all inputs and outputs of a product (or service) system during its entire life cycle. "The green environmental protection of flexible packaging with a price increase of 30 yuan/ton in Yunnan is a systematic project." Miss Liu, a comprehensive service company specializing in product certification consulting and management system certification consulting in Shanghai, said, "the environmental management system will help organizations systematically deal with environmental problems, and combine environmental protection with enterprise management, making it a part of the daily operation and business strategy of the enterprise."

according to the ISO14000 environmental management system certification requirements, after the enterprise has established the environmental management system, the relationship between different functional departments can be coordinated through management activity procedures, establishment of standardized documents and records and other measures. Good environmental policy and environmental management foundation can be established; Identify and control major environmental factors and impacts; Identify the gap between the requirements of relevant environmental laws and regulations and the current situation; Reduce the environmental impact caused by pollution accidents or violations of laws and regulations; Establish the priority sequence of pollution prevention within the organization and strive to achieve the goal of pollution prevention; Improve the ability to monitor the environment and evaluate the efficiency of the system, including promoting the improvement and adjustment of the system to adapt to new and changing situations and requirements; There are many important business and environmental opportunities due to the improvement of the environment

"at present, although the domestic green packaging industry is developing rapidly, the production capacity can not meet the actual demand, which should be a very attractive industry for investors." Dongjinshi, deputy director of China Packaging Resources Comprehensive Utilization Committee, said, "at present, there are many new environmental protection technologies at home and abroad, especially in the plastic field. Whether investors can use these technologies to open new markets will determine whether the investment can succeed." There are many obstacles hidden behind the green packaging of the domestic case flexo printing production line. Such as high cost and low market acceptance. How to find a suitable entry point? What does green packaging mean to soft packaging enterprises? Modern Nirvana "has backward equipment, disordered management, low production capacity and scattered people... This is what I saw when I first came to the company." Said Huangxing, general manager of Hainan Modern Color Printing Co., Ltd. However, once we enter the factory, we have to be amazed by such changes as modern workshops, well-organized production workshops, and open-ended material management. "How to change the unfavorable situation? I thought for a long time at that time. If I continued to follow up the backward production mode, I would not be able to turn losses into profits, and even the enterprise would be overwhelmed. Therefore, I thought of the joint-stock reform, and I thought of taking a new environmental protection scientific and technological route."

on this basis, modern color printing has redefined its business policy and marketing strategy, adhered to the green production line, paid attention to the analysis of the market and products, and put healthy and sustainable development in the first place. "This has not only enabled enterprises to get out of difficulties, but also made everyone full of hope." Huang Xing was very calm when he spoke. He felt calm after thousands of sails. The challenge of flexo printing modern color index is not plain sailing in the process of promoting green production. Flexo printing technology is widely used abroad, and its market share has reached more than 80%. However, in China, flexo printing and other environmentally friendly packaging technologies are not well accepted in the market. Director Xu of modern color introduction said that flexographic printing adopts the principle of embossing. Compared with gravure printing with thick oil and heavy color, it has fewer and thinner inks, and the coloring degree is not very high. In terms of brightness, it is not as bright as gravure printing. For a long time, domestic flexible packaging consumers have been in the mindset of gravure printing with strong coloring and high brightness, so they are not quite able to accept this new environmentally friendly printing technology. Moreover, the development of flexo printing technology is also limited by the market itself. The environmental friendly inks required depend on imports for a long time, resulting in high costs, which is also a reason why flexo printing cannot be widely promoted

"we have also been puzzled, whether to insist on starting or stop production and wait-and-see? In the face of a market that is not very prosperous, the old road will not work, but how to find a new road? A difficult problem lies ahead of us." Director Xu said excitedly. After careful investigation and analysis, they found that to deal with the many challenges brought by flexo printing production, it is a big problem to solve the localization of ink supply. Since we cannot rely entirely on imports, it is crucial to find alternatives. So they contacted some domestic ink manufacturers to develop new water-based inks for the expanded production of flexo printing. At the same time, actively explore new application fields of flexo printing, It provides the possibility for its future development... "In fact, environmental protection packaging technologies such as flexographic printing and solvent-free compounding have occupied a part of the packaging market. In the future, its prospects will be more promising. If we give up this big cake, we will suffer great losses. Today, when market development is difficult, we should seize this rare opportunity to make the development of the enterprise a higher level." Mr. Huang analyzed. After confirming the feasibility, Hainan modern color printing company introduced a complete set of equipment for the production of eight color flexographic benzene free and environmentally friendly color printing flexible packaging from Germany, Italy, Japan, Belgium and other countries to carry out benzene free printing and solvent-free compounding of various plastic film, paper, aluminum foil and other flexible packaging, which not only conforms to the international environmental food hygiene standards, but also actively responds to the call of environmentally friendly packaging, The resulting environmental protection effect is beyond the reach of traditional print production

at present, the environmental protection products produced by the company have been widely used in the fields of flexible packaging such as food, medicine, clothing, maternal and child health care, cigarettes, etc. the whole production process is controlled by computer, and the "green environmental protection packaging" is truly penetrated into every product. There is a long way to go before breaking through the siege, but it is not an opportunity. Facing the unfavorable situation of flexo printing technology market promotion, Hainan Hyundai is actively looking for new application fields. "Liquid milk packaging is a breakthrough"

Copyright © 2011 JIN SHI