The development and research of ecological packaging continued

Research on other ecological plastic packaging

1. Development of lightweight, thin film, high quality plastics. In order to reduce the total amount of plastic packaging waste, various countries have actively promoted thin film and improved their quality. Japan has developed a super tough ultra-thin PET film with a thickness of 0.5 micron for packaging of precision electronic components. Finland has developed an OPA/PE composite film that has been reduced in thickness by 1/3 without affecting other properties.

2. Develop recycled plastics that can be recycled. If plastic packaging materials can be reused, the consumption of raw materials and the pollution to the environment can be greatly reduced. For example, the use of PET bottles, PET bottles were crushed and then blown back into new bottles, with little change in physical, chemical, and overall mechanical properties. Polyethylene naphthalate (PEN) is more heat-resistant than PET, can withstand the sterilization conditions required for low-acid foods, has better gas barrier properties and UV protection, can replace glass bottles, and can be reused. Wide application.

3. Develop new foam plastics. As foam plastic lunch boxes and cushioning packaging materials are used in small quantities and with huge amounts, people are researching new types of foam plastics. It is now ideal to use methylene chloride foam PS, PP, and PET for food and electronic product packaging. U.S. developed with high efficiency
INSTAPACK polyurethane foaming agents can be foamed with very few materials, can be reshaped and used, and are easy to handle. The current development of high melt strength polypropylene (HMSPP) and polypropylene homopolymers can produce foamed polypropylene, which can save 20% of raw materials and reduce the environmental load compared with the same performance polypropylene sheet.

2. Natural biological packaging materials

The use of natural biological resources to develop packaging materials has the characteristics of low environmental load and abundant resources. Making full use of raw materials such as bamboo, sawdust, hemp, cotton fabrics, wicker, reeds, crop straws, rice straw, and wheat straw chitin, etc., expanding the variety of packaging and increasing the technological content have become one of the directions of the ecological package.

For example, rice straw processed into rice straw has the functions of energy saving, heat preservation, heat insulation, sound insulation, etc., good air permeability, high impact strength, and significantly higher water and shock resistance than traditional materials; in addition, straw boards are used as packaging materials. Its unit mass is 1/10 of the same volume of cardboard material, which has obvious advantages; in China, a polystyrene foam lunch box substitute using rice straw as raw material is developed; Puffleaves can be manufactured by heat-setting, bleaching, and sterilization. , subject to the attention of foreign importers.

In addition to rice straw, domestic straw pulp was used as the main raw material to develop disposable cardboard. It uses chemical additives to improve the quality of straw pulp to optimize the application technology to ensure that the straw is close to the physical properties of the wood pulp needed to make the cutlery board. The surface is then processed to suit the food packaging, so that the finished product is resistant to hot water. , no leakage, no stratification, oil resistance and heat sealing functions. And can be recycled to produce writing paper.

Natural chitin is also a very good raw material. Each year, the global biosynthetic chitin reaches tens of billions of tons, and the output is second only to natural cellulose. It is the second largest bio-polymer resource on earth. The packaging material prepared by chitin processing has good air permeability and good water absorption and moisture retention. Because the raw materials come from natural, non-toxic, odorless, and heat-resistant, they can meet the hygienic requirements for packaging materials in food, health, and pharmaceutical industries. The material also has good chemical stability, light resistance, chemical resistance, oil resistance, organic solution resistance, cold resistance, etc., and its stability is superior to paper.

3. Edible packaging materials

The package is harmless to the human body, edible and has a certain strength, mainly used for food and medicine packaging, using starch, protein, plant fiber, chitin and other natural substances as raw materials.

Corn protein packaging film: It can be easily decomposed into organic materials under natural conditions. It is suitable for food packaging with high oil content, high permeability, high fat content food, fast food industry, fried potato food and moon cake production. Corn protein packaging film is mainly used in the inner layer of fast food boxes and other foods with oil. The film is a synthetic paper and corn protein packaging material, will not be infiltrated by grease. The packaging material has a bright future. Many large companies are optimistic about this new environmentally friendly material. Coca-Cola used 500,000 disposable cups at the Salt Lake City Winter Olympics, all made of corn plastic. The cup disappeared in the open air in just 40 days. The famous Japanese electrical manufacturer, Sony Corporation, has been packing MD disks with plastic paper made from corn for two years. The new packaging is as beautiful as the previous packaging, but it will not produce the "durable" adverse effects. DuPont, a giant in chemical production, also joined the ranks of developing corn plastics. The company’s research also received US$19 million in financial support from the US Department of Energy.

Soy Protein Edible Packaging Film: Widely used for a variety of ready-to-eat foods. Mainly uses the remaining material after soybean extract soybean meal production, raw material source is broad. In particular, the region rich in soybeans in the North is rich in raw materials. Since soybean residues from soybean meal are used, the price is extremely cheap. The packaging film can not only prevent oxygen from entering, but also maintain moisture, but also ensure the original taste. This kind of edible packaging film is widely used in the food production industry. Most of the sweets and cakes can be used. Because the package has a fresh function and rich raw materials, it has an excellent industrial prospect.

Chitosan Edible Packaging Film: This kind of edible packaging solves the contradiction between food packaging waste and environmental protection, and is applied to candy, preserved fruit, fresh cakes, and moon cake preservation. The packaging film uses shellfish extract chitosan as the main raw material, combines chitosan and lauric acid to form a uniform edible film, and uses the packaging film to package peeled fruit and fruit slices. Good preservation effect. The chitosan used in this packaging material is a processed product obtained by crushing shellfish shells. Because it comes from natural, no pollution to the environment, the effect of supplementing trace elements on the human body after eating can be described as a new type of environmental food packaging. The inadequacy of the raw material source is limited.

Compound Edible Packaging Film: Combines different ratios of protein, fatty acid and starch to produce edible films with different physical properties. The product can adjust the softness and hardness of the packaging film according to food, forming different types of inner packagings, and it should have a huge market in the food industry.

4 new paper packaging

(1) Research on paper packaging film. The development of high-performance paper packaging films to replace plastic films commonly used in food packaging is very promising. For example, cellophane treated with moisture-proof can be used for packaging of foods and cosmetics. The German Institute of Applied Polymers, Francois Verne recently successfully developed a high-strength paper film with a thickness of only a few microns, which is characterized by resistance to tearing, moisture, easy sealing, blowable molding, and fast biodegradation.

(2) Honeycomb sandwich board. It is a kind of natural honeycomb paper core in the middle. The upper and lower sides are made of cardboard. It has the advantages of lightness, strength, rigidity and stability. It has very good cushioning properties and mechanical strength. It is suitable for packaging precious and fragile articles such as glass. Instruments and precision instruments.

Third, the research direction of ecological packaging development

Eco-packaging materials are not only a revolution in the production of packaging material manufacturers, but also have received extensive attention from the world. Therefore, the research of ecological packaging should be considered from the process of development, design, production, use, and disposal.

Nano plastic has excellent physical and mechanical properties, high strength, heat resistance, good gloss and transparency, high barrier properties, excellent processing performance, is an eco-friendly material, can be used for food, various chemical raw materials, toxic substances package.

The State Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences/National Center for Engineering Plastics successfully developed a series of nano-plastics such as polyamide (PA6 and PA66), polyester (PET and PBT), polyethylene, polystyrene, and epoxy resin. And to achieve the industrial production of some nano-plastics. Nanocomposites have great potential in the food packaging market. For films made of polyamide 6 nano plastic (nc-PA6), it can be blown and extruded to prepare heat-shrinkable enteric film, biaxially stretched film and composite film, and has better barrier property than ordinary PA6. , mechanical properties and transparency.
A biodegradable plastic that uses nanotechnology to efficiently catalyze the synthesis of CO2 has been successfully developed by the Guangzhou Institute of Chemistry, Chinese Academy of Sciences. The biodegradable plastics produced by the polymerization of CO2 and propylene oxide can replace the fast-food packaging containers widely used in the market, which not only solves the environmental problems caused by CO2, but also avoids the "white pollution" caused by the use of plastic packaging. ".

Gene technology is also one of the research directions. The use of advanced genetically oriented design splicing technology allows plants to grow containers of various shapes and colors according to people's design requirements (even these containers can be grown by pre-designed methods. Various patterns and patterns, such as the packaging of various types of milk, fruit juices, vinegar, and the packaging of various disposable cutlery, may have grown directly from a genetically-reconstructed corn plant. Future bottles may It was picked directly from a pepper plant created by genetic modification.

China's anti-dumping enterprises involved in the case should prepare judicial relief as soon as possible
2004-12-31 00:00 Has been viewed 1 times by the US Department of Commerce against the results of anti-dumping investigations on frozen and canned warm water shrimp from China and Vietnam 4 sample enterprises among the 57 Chinese companies except Zhanjiang Guolian Aquatic Products In addition, the other three companies were selling products in the United States with lower than normal value. The dumping margin ranged from 0.07% to 112.81%, 35 companies received an average tax rate of 55.23%, and other companies were awarded 112.81%. Tax rate.

The United States' "disastrous verdict" on Chinese shrimp products and its apparently unfair practice has not only caused a strong reaction in China's industry, but has also been strongly opposed by US shrimp processing companies and retailers. So, can the anti-dumping practices of the United States effectively solve the problem? Where do the Chinese companies involved go?

Anti-dumping will not help solve the problem effectively. "We will continue to pay close attention to the progress of the case." The person in charge of the Fair Trade Bureau of the Ministry of Commerce believes that the US shrimp industry itself cannot meet the needs of its domestic consumers. Imported shrimp products are not only in the domestic market. Needs also create a large number of employment opportunities within the United States. This is in the interests of the United States itself and the United States should face this fact squarely.

The person in charge said that the reason why China exports shrimp products to the United States is because of the favorable climatic conditions and lower labor costs in China. Moreover, the enterprises in the Chinese shrimp industry are mainly small and medium-sized enterprises, and it is impossible to export to the United States in a way that is lower than normal value.

It is understood that many US shrimp processing companies and retailers strongly oppose the US government's anti-dumping measures on shrimp products. These manufacturers stated that the processing and sale of imported shrimp products has created a lot of job opportunities for the United States. The Ministry of Commerce’s taxation ruling will cause many workers in the industry to become unemployed.

The “damage” claimed by the US anti-dumping case against the US shrimp is due to objective costs such as excessively high management costs, rising oil prices, and reduction of wild shrimp, which have resulted in rising fishing industry costs, not because of imported shrimp products. Recourse to anti-dumping measures to restrict the import of shrimp products does not help the effective resolution of this issue. The responsible person said: "We hope that the US International Trade Commission can make an objective and fair final ruling on the issue of damage and give Chinese companies fair treatment."

The company involved in the adjustment of product strategy "The US Department of Commerce's tax rate on our company's ruling is 0.07%, which is regarded as a zero tariff, which is the best result for our company." Zhanjiang Guolian Aquatic Company Chief Chen Han Told reporters. However, Chen Han also believes that “the US Department of Commerce’s ruling is unfair in itself. The United States does not recognize China’s market economy status, and measures the existence of dumping in China’s enterprises based on surrogate country standards. This is unfavorable to our country’s enterprises. Other companies impose high tariffs, which is undoubtedly a devastating blow to the entire shrimp industry in China."

Chen Han reminded his peers that he must establish anti-dumping awareness and establish a sound early warning mechanism as soon as possible.