Current situation and development trend of plastic

2022-08-19
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Current situation and development trend of food plastic packaging (I)

in recent years, plastic plays an important role in food packaging and is widely used in the packaging of food and other products. Food plastic packaging has become the most active field in the field of packaging materials. The development of plastic polymerization technology will inevitably have a significant impact on the protection of food or beverages

first, plastic food packaging is very popular

according to the data, the amount of plastic used for food packaging accounts for 1/4 of the total plastic output. It can be said that as soon as plastic used for food packaging appears, garbage will be generated. In supermarkets and shopping malls, many food packages are made of plastic. The plastic inflatable packaging of puffed food can prevent moisture, oxidation, fragrance, sunlight and extrusion, but such a large packaging is a great waste of resources; There is also the packaging of instant noodles. Plastic packaging is far more than that of paper bowls (or barrels). The sales price of bowls or barrels of instant noodles in the market is generally 1/3 higher than that of packaged instant noodles of the same quality. Because this packaging method is convenient to eat, especially when traveling, it can be eaten directly by boiling bubbles after opening the cover, and there is no need to bring other containers, so it is very popular with consumers

according to media reports on December 31, 2004, a market forecast report shows that the consumption of plastic packaging for food and beverage in Europe has increased in recent years and in the coming years. By 2007, the market sales of plastics for food and beverage packaging in Europe will increase from US $4.91 billion in 2000 to US $7.15 billion, with an average annual growth rate of 5.5%. Analysis of insiders: the fastest growth rate of plastic packaging sales of food and beverage in the European market will be the polypropylene packaging market, in which the average growth rate of thermoplastic polypropylene will reach 10.7%, and transparent polypropylene will increase by 9.5%; The second is pet, with an average annual growth rate of about 9.2%, while expanded polystyrene and soft; The market growth rate of PVC is the smallest, and may even stop growing. France (18.7%) is the country that uses the most plastic packaging materials in the food and beverage industry in Europe, followed by Italy (18%) and Germany (17.2%). With the improvement of people's living standards, new packaging technologies, products and materials continue to emerge. However, at present, the new food packaging popular in the U.S. market is mostly plastic packaging, which mainly includes high-temperature sterilization plastic cans, high barrier material food packaging, sterile packaging, flexible packaging materials and container packaging

in the beverage market, plastic bottles, especially PET bottles, are the most important and eye-catching packaging. In the carbonated beverage, water and beer markets, there is no paper packaging market at all; In the fruit juice market, compared with plastic containers, paper composite containers have a relatively close market share; PET bottles have appeared in the Baijiu market. For example, pet plastic bottles have been used in all Jianzhuang liquor produced by Wuliangye Group. Plastic beer bottles are also under intensive development, and products have been launched in the United States and Europe. Plastic bags of soy sauce have also appeared, and plastic barrels of soy sauce and vinegar have broken the dominance of glass bottles. Small packages such as monosodium glutamate and pepper powder are basically the market of plastic bags, and paper packaging is rarely used

at present, there are mainly several kinds of plastics used for beverage packaging: first, polyethylene (PE); PE is the largest synthetic resin in the world and the largest plastic packaging material in consumption. Polyethylene products are divided into low density, medium density and high density. Among them, high-density polyethylene civil aircrafts are not burned in the process of re-entry like spacecraft. Because of their high crystallinity, hardness, air tightness, mechanical strength and chemical resistance, HDPE is widely used to blow molding into hollow containers such as bottles. Using the good heat sealing performance of PE, the containers made of various composite materials can contain lemon juice, fruit juice and other beverages. Second, polyvinyl chloride (PVC): PVC can be roughly divided into hard products, soft products and paste products. PVC bottles produced by injection and blow molding have no seams, and the thickness of the bottle wall is uniform. They can contain aerated beverages such as Coca Cola and soft drinks. PVC bottles produced by extrusion and blow molding are only suitable for containing fruit juice and mineral water. Third, polypropylene (PP): because of its high transparency, smoothness and good processability, it can be compounded with other materials to make a variety of beverage packaging containers. Fourth, polyester (PET or PETP): PET bottles produced by biaxial extension blow molding have good transparency, high surface gloss and glassy appearance. They are the most suitable plastic bottles to replace glass bottles. In recent years, the production of PET bottles in China has developed rapidly and is widely used in all kinds of tea drinks, fruit juices and other beverages that need hot filling. Now it is also used in the packaging of Coca Cola. Fifth, polyvinylidene chloride (PVDC): this material is characterized by softness and extremely low air permeability "Through cooperation with companies with a long history in material development and manufacturing, it is a good heat shrinkable packaging material with good water permeability, fresh-keeping and fragrance retention properties. Cellophane is coated with PVDC and then compounded with PE, which is commonly used for packaging orange juice. In addition, it is coated on nylon or polyester and compounded with PE to become a variety of beverage packaging containers.

if the waste of any disposable consumer material is not properly treated, it will not establish a contract." Reasonable consumption and use of the system will cause environmental pollution. Europe is the region that has done the best in environmental protection, but plastic materials are still widely used for food packaging. China has not formed a reasonable waste treatment system, nor has it invested in the industrialization of aerogel gel in the development and application of plastic waste treatment technology. It is unscientific and not serious to simply think that plastic materials are not as environmentally friendly as paper. In the evaluation of the materials for the orderly shutdown and withdrawal of Jigang promoted by the environment, Europeans adopted the method of whole process evaluation, and did not think that paper was more in line with environmental protection requirements than plastic. In terms of resources and energy consumption, plastic is more than 1/2 less than paper; 1/6-1/5 less in material consumption; In terms of the degree of water pollution caused by the processing process, 300 plastic bottles are equivalent to a paper can with the same capacity

people are always worried about plastic food packaging, and some even think that plastic is "toxic". This concern about plastic food packaging may come from people's misunderstanding, that is, to equate all plastics with PVC. Many people have known that soft PVC film is not suitable for food packaging because it contains volatile plasticizers, and has been eliminated at present. The sanitary properties of polyethylene, polypropylene, polyester, polystyrene and other plastics used for food packaging are qualified. Moreover, in recent years, with the progress of analysis and identification technology, it has been able to accurately identify the components in plastics and the changes under various conditions. The results show that plastics used for food packaging are safe

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