The hottest plastic packaging encounters green bar

Plastic packaging encounters a green barrier

on February 14 this year, the Chengdu industrial investment orientation catalogue was officially released to the public by the municipal government, which clearly stipulates that "non degradable disposable plastic packaging products" are "prohibited from development". It is not the first time that plastic packaging has encountered such a ban. Only recently, Hainan Province and Qingdao, Shenyang, Wuhan and other cities in China have made similar provisions. In foreign countries, the French parliament passed a bill in 2005, stipulating that the sale and use of all biodegradable plastic bags and plastic packaging products will be comprehensively prohibited from 2010, and stipulating that the French government should provide necessary support for packaging products enterprises to adopt new technologies and convert to legal packaging products; Indian legislation prohibits the use of plastic packaging in the dairy industry where the current equipment price is developing downward; South African law completely prohibits the use of plastic packaging bags

the reason why plastic packaging suffers so much is, of course, that it violates environmental protection. With the continuous improvement of people's awareness of environmental protection, the adverse effects of plastic packaging waste on the environment are becoming increasingly apparent. Taking a large number of PVC (polyvinyl chloride) films in plastic packaging as an example, some experts pointed out that it is safe to use them in the packaging of various items, including food, but waste disposal is a problem. Plasticizers and stabilizers in PVC additives will pollute groundwater and soil when they are treated by landfill. When incinerated, a carcinogen called dioxin will be produced. Because of this, the environmental protection departments of many countries and regions in the world have issued relevant regulations to prohibit or restrict the massive use of PVC. Europe banned the use of PVC as food packaging material in 1992, and Japan also banned the use of PVC packaging in 2000. According to the announcement of the World Packaging Organization Council, Singapore and South Korea have completely banned PVC as packaging material. Taiwan has also issued the waste cleaning law, which stipulates that PVC as packaging material will be banned from 2006. Because of such a green barrier, many countries in the world are developing and using packaging materials that can save resources, are easy to recycle after use, and are easy to be absorbed or degraded by the environment. Wal Mart, the global retail giant, announced that it would replace all commodity packaging with polylactic acid plastic products. Since November 1st, 2005, the first batch of goods packed with this material have been put on shelves. The replacement operation will be carried out simultaneously in 3779 Wal Mart Supermarkets in the United States and Wal Mart Supermarkets in neighboring countries. The raw material of polylactic acid plastic is extracted from natural grains, which is degradable. The key units and components of the environmental protection system are made with current international advanced technology, commonly known as "corn plastic". Wal Mart officials said that the plastic used in traditional packaging materials is refined from oil, and now it is converted to natural grains, which is not only conducive to resource conservation and the protection of the external environment, but also conducive to the development of the company's business. Because this kind of plastic has the characteristics of "breathing", there will be no condensation of water in traditional plastic packaging bags after packaging. According to a report of the U.S. Environmental Protection Agency, 32% of U.S. waste in 2003 was plastic packaging, cans and other products, causing great pollution. Environmental protection experts welcome sheet metal, a kind of protective layer on the surface of fatigue testing machine. This biodegradable "corn plastic" is very popular

traditional plastic packaging is not completely out of favor before the green barrier. An Italian company used high-strength polypropylene and other materials to produce foamed polypropylene sheets with fine pores and uniform distribution. Due to its low product density, it can save 20% of raw materials, thus saving 20% of the expenses that need to be paid for destroying the ecological environment. Bayer has developed polycarbonate packaging materials for intravenous injection, which are safe to use and easy to recycle. Easy recycling is the development direction of packaging plastics. Polyethylene terephthalate (PET) and biodegradable plastics in environmentally degradable plastics (EDP) have become a hot spot in the development of packaging plastics. The new polyethylene naphthalene dicarboxylate (pen) not only has the above characteristics, but also has better barrier properties than pet, especially gas barrier and UV resistance, and good heat resistance. The thermal deformation temperature of ordinary amorphous pen can reach 100 degrees Celsius, while pet is only 70 degrees Celsius. Therefore, pen has broad prospects in the packaging of beverages, beer and cosmetics. In Europe, the industrialized production of pen has made progress. In the near future, pen is expected to enter the packaging field in large numbers, triggering another packaging revolution after pet. BASF company of Germany has launched a degradation resin polymerized with aliphatic alcohols and aromatic acids, which can be used in film production. According to information, the annual demand of degradable plastics in Western Europe has reached 20000 tons, which are mainly used in compost bags, garbage bags, fast food packaging containers and beverage cups

despite the green barrier, there is still great potential for plastic to be used in packaging. Guan has now been replaced by the products of Foshan Zhiren building materials and other companies. The key is to focus on reducing waste pollution, solving the environmental protection and recycling of solvents, and strive to develop new materials, new processes, new technologies, and new products, so that plastic packaging can develop into a high-performance, multi-functional, harmonious relationship with the environment, and bring more convenience to mankind

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