Application and promotion measures of the hottest

2022-08-13
  • Detail

Application and promotion measures of green packaging materials (Part 2)

2. Polylactic acid packaging materials

collegefarm candy in the United States uses biodegradable resin polylactic acid (PLA) nature works natural material packaging film. This film has the same appearance and performance as the traditional candy packaging film (cellophane or biaxially oriented polypropylene film), only crystal transparency, excellent kink retention, printability and strength, and high barrier, which can better retain the flavor of candy. At present, one set of high-speed kink packaging equipment of the company adopts planatureworks film, with a production capacity of 1300 pieces/min. Faerch plastic company in Denmark invented to use polylactic acid as the packaging material. The new products are suitable for packaging low-temperature fresh food, including all kinds of pasta, internal and salad. The current packaging products of Faerch company include all kinds of plates and bottles. The original processing resins that can be heat sealed and packaged are PS, PP and pet. Adopting this new product will put the company and its users at the front end of the packaging industry. A German company successfully developed a green food cup with rapid natural decomposition function using polylactic acid as raw material, which opened up a new practical way to solve the problem of degradation of disposable plastic packaging in the past. This degradable material developed by the company belongs to polyester polymers. Lactic acid can be extracted from sugar beet fermented liquid and subjected to ring opening polymerization to produce polylactic acid

polylactic acid has become a worldwide research and development hotspot. It is a new biodegradable polymer material polymerized by many lactic acid molecules, which can be completely decomposed into water and carbon dioxide, without any harm to the environment. In November, 2004, the degradable polylactic acid material developed by Shanghai Xinli Industrial Microbiology Technology Co., Ltd. in cooperation with the school of material science and engineering of Tongji University and the increasing downward pressure on the economy has been successfully developed, and has been listed as a major industrialization project of revitalizing the city through science and education in Shanghai. Polylactic acid production takes lactic acid as raw material, and the traditional lactic acid fermentation mostly uses starch raw materials. At present, the United States, France, Japan and other countries have developed and utilized agricultural and sideline products such as corn, sugar cane, sugar beet, potato and so on as raw materials to produce lactic acid, and then produce polylactic acid. The technological process of manufacturing biodegradable plastics from corn by LLC in the United States is as follows: first, grind the corn into powder, separate the starch, and then extract the original glucose from the starch. Then anaerobic fermentation with Lactobacillus, the fermentation process is neutralized with liquid alkali to produce lactic acid. After purification, L-lactic acid with purity of 99.5% is prepared by electrodialysis process. Then the extracted lactic acid is made into the final polymer - polylactic acid. The global annual output of 600 million tons of corn makes it the preferred raw material for biodegradable plastics

3. Natural biological packaging materials

natural biological packaging materials such as wood, bamboo weaving materials, sawdust, hemp cotton fabrics, wickers, reeds, as well as crop stems, straw, wheat straw, etc. are very easy to decompose in the natural environment; It does not pollute the dusty environment, and the resources are renewable and the cost is low. Bamboo packaging materials can be reduced, such as hollow bamboo baskets. It can be reused and recycled, and bamboo packaging products can be reused. The situation that the key materials of nuclear power reactor core are imported is difficult to be greatly improved in a short time, and the waste can be incinerated to use heat; Compost is rotten and can be used as fertilizer. Waste can be degraded naturally. The whole process of bamboo cutting, bamboo processing, bamboo packaging material manufacturing and use, waste recycling or degradation will not cause harm to human body and the environment, which conforms to the 3rid principle of green packaging and the requirements of life cycle analysis (LCA). Bamboo plywood has the characteristics of high strength, low price, light weight, easy recycling of waste and no environmental pollution. It is an excellent green packaging material. Bamboo plywood is based on the vertical structure of bamboo fibers, which is woven into a sheet according to the longitude and latitude, and then dried, glued, assembled, and hot pressed. The bamboo plywood made has good physical and chemical properties, large product size, small difference in physical and mechanical properties in the vertical and horizontal directions, high strength, and good moisture resistance

4. Environmentally friendly packaging of food waste

according to the American magazine New Scientist, biochemists at the Hawaii Institute of natural energy have made food waste into a biodegradable polymer, which researchers playfully call "perfect plastic". This kind of plastic, which can be degraded in a short time, is widely used. It can not only be used to make bottles, bags and other packaging materials, but also be made into capsule coats of drugs. According to the biochemist of the natural energy research institute quoted by new scientist, the raw material of the new degradable plastic is the mixture of water and various food wastes. Each 100kg mixture can produce 22~25kg of degradable plastic, which not only greatly reduces the production cost

1. Formulate the development plan of green packaging materials

the development of green packaging materials involves many high-tech. industrial developed countries have studied fully biodegradable plastics for several years, but so far there are not many real industrialized products, which involves many problems of experimental research and industrial production. The development of green packaging materials is not only a matter of the packaging industry, but also requires the cooperation of the whole industry; Not only industrial enterprises, but also scientific research institutes and colleges and universities. Therefore, we should formulate a five-year plan for the development of green packaging materials, but due to the continued downturn in the capital market, we cannot but temporarily withdraw the application for additional issuance - a 10-year development plan for green packaging materials, and put forward major research and development projects and goals, such as high-performance, low-cost pulp molded disposable tableware and packaging products, honeycomb cardboard boxes and production equipment that replace wooden boxes, plant fiber cushioning packaging products, fully biodegradable plastics, and edible packaging materials, High strength thin-wall lightweight glass bottles, high-quality recycling technology of waste packaging, especially high-quality recycling technology of waste plastics, green technology of waste plastics, etc., gather people and property, organize capable teams, carry out key research and cooperation in a planned and targeted manner, and make the development of green packaging materials in China rank in the forefront of the world

2. Formulate and improve the legal system of green packaging

the regulations of green packaging materials should include the environmental standards of green packaging materials, administrative regulations to control the total amount of emissions, and environmental purification technical regulations to prevent and eliminate pollutants discharged into the environment. It should also establish a system for recycling and reuse of used packaging waste, and formulate the recycling goals of packaging materials that must be achieved in 5 and 10 years. Regulations on green packaging materials can also be incorporated into green packaging regulations, such as "packaging waste restriction law" or "packaging law"

In recent decades, developed countries have taken measures and formulated various laws and directives, mainly including the following: first, the use of certain packaging materials is prohibited in the form of legislation. For example, legislation prohibits the use of packaging materials containing lead, mercury and copper; Appliances that cannot be reused; Packaging materials that fail to reach a specific recycling ratio. The second is to establish a storage return system. Many countries stipulate that recyclable containers should be used for alcoholic beverages and soft drinks. Some countries (such as Denmark) require that if they cannot meet this standard, they refuse to import. Third, implement tax incentives or fines. That is, manufacturers that produce and use packaging materials will be given tax exemption, low tax preference or higher tax according to whether the raw materials they produce and package or the packaging they use are safe, or some of the packaging materials that can be recycled, so as to encourage the use of renewable resources. Fourth, advocate appropriate packaging. Excessive packaging causes waste of resources and unnecessary environmental pollution. Some developed countries are advocating appropriate packaging, and have issued some laws and regulations. For example, the United States has made normative restrictions based on the complexity and luxury of commodity packaging in a certain proportion, and heavy fines will be imposed if excessive packaging exceeds the requirements, so as to force manufacturers to simplify packaging, and Japan even put forward the idea of zero packaging

although there is no green packaging law in China, it does not mean that there are no laws and regulations regulating green packaging. As the pollution of packaging to the environment is a part of environmental problems, green packaging is an important aspect of protecting natural resources and preventing environmental pollution. Therefore, it should be regulated by the environmental protection law. The environmental protection law defines the principles of coordination between environmental protection and economic and social development; the principles of prevention first, prevention and control combined, and comprehensive treatment; the principles of polluter payment, user compensation, developer protection, destroyer recovery, and relying on the masses to protect the environment. In addition, the environmental protection law also stipulates the environmental impact assessment system, "three Simultaneities" system, sewage charging system, permit system Basic systems such as the deadline treatment system. As a mandatory means of environmental management, legislative management is an effective measure widely adopted by countries all over the world. In order to protect the smooth operation of the green packaging system, we must establish and improve the legal system, manage the production, circulation and use of packaging through legislation, and promote the development of green packaging with laws and regulations

3. Research and development of environmental protection production and recycling technology

the environmental performance of packaging materials should be evaluated from the whole process of life cycle. In fact, the environmental pollution caused by the paper, plastic, metal and glass packaging currently mainly used in the production process is far greater than that caused by waste, such as the waste liquid discharged from paper packaging in pulping and papermaking, the atmospheric pollution caused by plastic packaging in the refining process of petroleum raw materials, and the physical and mental pollution caused to workers by the noise and smoke generated by metal packaging in the edging and coating processes, The dust, carbon dioxide and z-silicon oxide emitted from glass packaging in the smelting process have caused serious environmental pollution. Therefore, in order to make packaging materials have "green" performance in the whole life cycle, it is necessary to carry out cleaner production. Among the three elements of "clean energy and raw materials", "clean production process" and "clean products", the most important is to develop clean production process technology. Clean production process is "less waste" and "no waste" process. It is necessary to establish a production closed loop so that the materials volatilized or precipitated or leaked in the production process can be recycled through recycling; As raw materials are reused, a closed production process from raw materials input to waste recycling is established to minimize the external discharge of waste. This not only improves the utilization rate of resources, but also fundamentally eliminates the generation of "three wastes", so that the production of packaging industry does not cause harm to the environment. China has formally implemented the "Cleaner Production Promotion Law" since January 1st, 2003, which requires enterprises with toxic and harmful production processes and environmental pollution to conduct cleaner production audits. Therefore, developing cleaner production technology of green packaging materials is very important for the development of green packaging materials. Packaging made of a single material is easy to recycle, and composite materials with multi-level structure must be easy to separate without hindering reuse. For example, the aluminum beverage can be coated with organic paint on the surface. When it is recycled and melted, the organic paint can be burned, which will not bring difficulties to recycling, and the composite paper plastic packaging is difficult to separate and purify. However, composite materials are widely used in packaging materials, including plastic plastic composite, paper plastic composite, plastic aluminum composite, paper plastic aluminum composite, plastic wood composite and other composite methods, which are making

Copyright © 2011 JIN SHI