Development and application of the most popular ze

2022-08-07
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The development and application of zero degree packaging materials in foreign countries

the commodity packaging around the world is upgrading day by day, resulting in an astonishing waste of resources. The abuse of plastic products also brings a great burden to waste treatment. In the United States, waste plastics account for 20% of domestic waste, mainly packaging bags and containers. Plastic packaging bags and boxes need more than a century to decompose, causing serious environmental pollution. At the same time, some harmful ingredients in food packaging materials will also cause harm as food enters the human body. Therefore, in order to save resources and protect the environment, some countries have started to study various methods to solve the packaging problem. The ideal they hope to achieve is zero packaging, that is, the packaging method that does not produce any waste

research institutions all over the world, especially some large enterprises, have begun to study packaging materials that can be recycled or can be rapidly decomposed under natural conditions. For example, scientists of Bayer company in Germany, which is well-known in the global chemical industry, who study cellulose products, have successfully developed degradable plastics that can be dissolved into compost. All kinds of packaging products made of this plastic can be quickly decomposed after being discarded and return to nature without any pollution to the environment. These scientists made a new plastic material by mixing the tough and non extensible cellulose with polyurethane for synthetic leather. When this cellulose containing degradable plastic material is discarded and buried in the soil, it becomes a delicious food for microorganisms in the soil. Microorganisms multiply in large numbers and quickly swallow the plastic, making it turn into humus in just 10 days, without adverse effects on soil, microorganisms, algae, fish, etc. This kind of degradable plastic can be used in garbage bags, medical containers and all kinds of packaging, even children's diapers and funeral wreaths. The flower pot embedded in the soil made of it can even serve as compost after decay, so that the flower seedlings planted with

are twice as long as the flowers in the traditional flower pot, and the flowers are more beautiful

France Latham company forms a 100% biodegradable plastic by biological action of plant and animal materials. The price of this polymer is 20-25 francs per kilogram, which is 10 times cheaper than the best material at present. This biodegradable packaging material can be completely converted into carbon dioxide, water and humus when buried underground or in lakes

another kind of zero temperature packaging material is made of starch as raw material. For example, a starch packaging cup invented in Germany that will not melt in the presence of liquid can contain drinks, dairy products and other food. After eating the food, the cup can be eaten together. This invention has saved the material for manufacturing 4billion plastic cups and the corresponding disposal costs in Germany every year. The fast food box launched by Norway at the 1994 Lillehammer Winter Olympic Games is also a starch packaging that can be eaten together with food. A kind of plastic film invented in Britain for food and fruit preservation can be dissolved in water within ten minutes. The United States has also successfully developed a plastic bag made of starch and synthetic fiber, which can be decomposed into water and carbon dioxide in nature

all the above zero packaging materials have strict requirements and objectives in the test, that is, the materials, additives and decomposed products must be harmless to the environment, and even reach the edible standard that is not harmful to human health. The decomposed products only contain water, carbon dioxide and humic substances; The product should be good in nature and reasonable in price, and it is easy to realize commercialized production

at present, the new fashion in the international commodity packaging market is to replace the high-efficiency plastic packaging crystal with paper and the bag packaging crystal. In particular, the paper packaging made of recycled paper, which is known as "green packaging", has become the leading product in the commodity packaging market and has a great potential to gradually cover the packaging industry. According to people in the grain packaging industry, paper packaging bags will gradually replace the traditional cloth bags, gunny bags and plastic bags for grain packaging. The material used to make the paper bag is a kind of flexible paper bag. Compared with ordinary paper, the strength is 1.5 times higher. A paper bag filled with 25kg flour is composed of four layers of flexible paper. It falls freely from a height of 1.5m for 15 times without damage. The outstanding advantages of paper bag packaging of grain are non-toxic, tasteless and pollution-free, which meet the food hygiene standards. The paper bag has better sealing performance than the cloth bag, which can prevent flour from leaking out and dust from invading. Under the same conditions, the shelf life of flour packaged in paper bags can be extended by 2-3 months compared with that packaged in cloth bags

in response to the requirements of a wide range of small and medium-sized wood-based panel consumer enterprises and various wood quality inspection departments, the environmental protection system has increasingly become a non-tariff trade barrier in the world. Taking packaging as an example, due to the discrimination or exclusion of various products in plastic packaging in international trade, a chemical plant in Shijiazhuang City, China exported phosphoric acid to Europe, but it was rejected by the foreign party on the grounds of environmental pollution because it was packed in plastic bags. Therefore, in order to actively adapt to the international trend, China's packaging industry is adjusting the types of packaging products. At present, China has been able to produce full paper cans, which can replace plastic and iron cans. The paper barrel can meets the requirements of national standards, month. The process is simple, the price is low, and there is no pollution, so it has broad development prospects. In order to eliminate the "white pollution" of plastic disposable tableware along the railway, this is an excellent bridging material. Some railway bureaus have replaced plastic tableware with paper fast food tableware. It is reported that China has considered formulating policies and decrees on the substitution of paper for plastics, so that China's packaging industry can keep pace with the international pace and step into a good track of sustainable development

(Wen/xuefulian)

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