Development and application of zero temperature pa

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The development and application of zero degree packaging materials in foreign countries

the commodity packaging all over the world is upgrading day by day, resulting in an astonishing waste of resources, and the abuse of plastic products has also brought a great burden to waste treatment. In the United States, waste plastics account for 20% of household 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 begun to study various ways to solve the packaging problem of these products with excellent lightweight potential. The ideal they hope to achieve is zero packaging, that is, a packaging method that does not produce any garbage

research institutions all over the world, especially some large enterprises, have begun to study packaging materials that can be recycled or can be quickly 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 mixed the tough and non extensible cellulose with polyurethane for synthetic leather to make a new plastic material. 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 degradable plastic can be used in garbage bags, medical containers and all kinds of packaging, and even children's diapers and funeral wreaths. The flowerpot buried in the soil made of it can even serve as compost after decay, so that the seedlings planted inside are twice as tall as the flowers in the traditional flowerpot, and the flowers are more beautiful

French Latham company forms a 100% biodegradable plastic by biological action of plant and animal materials. The price of this polymer is 20 per kilogram. The product is jointly developed by BASF, Konstantin GIC industrial design company in Munich, Germany, and Italian furniture manufacturer plant SRL, 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, the experimental machine invented by Germany has low efficiency. A starch packaging cup that will not dissolve in the presence of liquid can contain drinks, dairy products and other food, and can be eaten together after eating food. Before stopping the impact testing machine, this invention saved Germany the materials for manufacturing 4billion plastic cups and the corresponding disposal costs every year. The snack 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 10 minutes. The United States has also successfully studied a plastic bag made of starch and synthetic fiber, which can be decomposed into water and carbon dioxide in nature

the above zero temperature 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 humus; The nature of the product is good and the price should be reasonable, which is easy to realize commercialized production, etc

at present, the new fashion in the international commodity packaging market is to replace plastic packaging with paper and cloth bag packaging. In particular, the paper packaging made of recycled paper, 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 15 times higher. A paper bag filled with 25kg flour is composed of four layers of flexible paper, which falls freely from a height of 15 meters for 15 times without damage. The outstanding advantage of paper bag packaging of grain is non-toxic, tasteless, pollution-free, in line with food hygiene standards. Paper bags are better sealed than cloth bags, which can prevent flour leakage and dust intrusion. 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

source: China's packaging industry

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