Development and research of the most popular ecolo

Development and research of ecological packaging continued

Research on other ecological plastic packaging

1 Develop light-weight, thin-film and high-quality plastics. In order to reduce the total amount of plastic packaging waste, all countries actively promote film and improve its quality. Japan has developed an ultra tough and ultra-thin PET film to put the sheepfold on the hillside, with a thickness of 0.5 microns, which is used for the packaging of precision electronic components. Finland has developed an opa/pe composite film, with a thickness reduction of 1/3, while other properties are not affected

2. Develop recyclable and reusable plastics. If plastic packaging materials can be reused, the consumption of raw materials and environmental pollution can be greatly reduced. For example, the use of PET bottles, which are blown into new bottles after crushing, has little change in physical, chemical and comprehensive mechanical properties. Polyethylene naphthalate (pen) has better heat resistance than pet, can withstand the disinfection conditions required by low acid food, has better gas resistance and UV protection, can replace glass bottles, can be reused, and has a wide range of applications

3. Develop new foamed plastics. Because the foamed plastic lunch boxes and cushioning packaging materials use less materials and use a large amount of materials, people study new foamed plastics. At present, dichloromethane foaming PS, PP and pet are ideal for the packaging of food and electronic products. The high-efficiency fluorine-free

instapack polyurethane foaming agent developed in the United States can be foamed with few materials, can be repeatedly molded and used, and is easy to handle. The currently developed high melt strength polypropylene (HMSPP) and polypropylene homopolymer can produce foamed polypropylene, which can save 20% of raw materials compared with polypropylene sheets with the same performance, and the environmental load is also reduced

２. Natural biological packaging materials

using natural biological resources to develop packaging materials has the characteristics of low environmental load and rich resources. Making full use of bamboo, sawdust, hemp, cotton fabric, wicker, reed, crop straw, straw and wheat straw chitin and other raw materials, expanding packaging varieties and improving technical content has become one of the directions of packaging ecology

for example, straw board processed from straw has the functions of energy saving, heat preservation, heat insulation, sound insulation, good permeability, high impact strength, and significantly higher waterproof and seismic resistance than traditional materials; In addition, as a packaging material, the unit mass of straw board is 1/10 of that of paperboard with the same volume, which has obvious advantages; In China, we have developed a substitute of styrofoam lunch box with straw as raw material; Pu leaves can be made into disposable packaging after thermal characterization, bleaching and sterilization, which has attracted the attention of foreign importers

in addition to straw, other straw pulps are also used as the main raw materials in China to develop special cardboard for disposable tableware. It adopts the optimized application technology of chemical additives to improve the quality of straw pulp to ensure that the straw pulp is close to the physical properties of wood pulp required for the manufacture of tableware paperboard, and the surface is processed for food packaging, so that the finished product has the functions of hot water resistance, no leakage, no layering, oil resistance and heat sealing. And it can be recycled to produce writing paper

natural chitin is also a very good raw material. Chitin biosynthesis in the world reaches tens of billions of tons every year, and its output is second only to natural cellulose. It is the second largest biopolymer resource on the earth. The packaging material processed with chitin has good air permeability and moisture absorption. Because the raw materials are natural, non-toxic, tasteless and heat-resistant, they can meet the hygienic requirements of food, health, pharmaceutical and other industries for packaging materials. The material also has good chemical stability, light resistance, drug resistance, oil resistance, organic solution resistance, cold resistance, etc., and its stability is better than that of paper

３. Edible packaging material

this packaging is harmless to human body, edible and has a certain strength. It is mainly used for food and drug 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 matter under natural conditions. It is suitable for high fat food packaging with heavy fat and strong permeability, as well as food enterprises such as fast food industry, fried potato food, moon cake production, etc. Corn protein packaging film is mainly used for the inner layer of fast food boxes and other oily foods. The film is a packaging material synthesized from paper and corn protein, and will not be penetrated by grease. The packaging material has broad prospects. Many large companies are optimistic about this new environmentally friendly material. Coca Cola used 500000 disposable cups at the Salt Lake City Winter Olympics, all made of corn plastic. The cup disappeared in the open air in only 40 days. Sony, a famous Japanese electrical appliance manufacturer, has been packaging MD trays with plastic paper made of corn for two years. The new packaging is as beautiful as the previous packaging, but it will not produce the adverse effect of "durability". DuPont, a chemical production giant, has also joined the team to develop corn plastics, and its research has also received $19million in financial support from the U.S. Department of energy

edible packaging film of soybean protein: widely used, suitable for all kinds of instant food. It is mainly produced by using the residual material after extracting soybean meal from soybeans, and the source of raw materials is broad. In particular, the areas rich in soybeans in the north are rich in raw materials. Because it is the residue from soybean meal, the price is extremely cheap. The packaging film can not only prevent oxygen from entering, but also maintain moisture and ensure the original flavor. This edible packaging film is widely used in the food production industry. Most candies and cakes can be used. Because the packaging has the function of keeping fresh and rich raw materials, it has an excellent industrial prospect

Chitosan Edible Packaging Film: this edible packaging solves the contradiction between food packaging waste and environmental protection. It is applied to candy, preserved fruit, bao8, and samples with large experimental force. Generally, the inclined clamping structure is adopted, and the clamping force increases with the increase of experimental force; Fresh cake, moon cake preservation, etc. This packaging film uses chitosan, a shellfish extract, as the main raw material, combines chitosan with lauric acid to produce a uniform edible film, and uses this packaging film to package peeled fruits and fruit slices, which also has a good fresh-keeping effect. The chitosan used in this packaging material is the processed product of shellfish shell after crushing. Because it comes from nature and has no pollution to the environment, it has the effect of supplementing trace elements to the human body after eating. It can be described as a new type of environmentally friendly food packaging. Its deficiency is the limited source of raw materials

composite edible packaging film: different proportions of protein, fatty acid and starch are synthesized together to produce edible films with different physical properties. The product can adjust the softness and hardness of the packaging film according to the food to form different types of inner packaging, which should have a huge market in the food industry

４. New paper packaging

(1) research on paper packaging film. It is very promising to develop high-performance paper packaging film to replace the plastic film commonly used in food packaging. For example, glass paper with moisture-proof treatment can be used for the packaging of food and cosmetics. The franhoffer Institute of applied polymers in Germany has recently developed a high-strength paper film with a thickness of only a few microns, which has the characteristics of tear resistance, moisture resistance, easy sealing, blow molding, fast biodegradation, etc

(2) honeycomb sandwich board. It is a natural honeycomb paper core in the middle, which is bonded by cardboard on the upper and lower sides. It has four advantages: light, strong, rigid and stable. It has very good cushioning performance and mechanical strength. It is suitable for packaging valuable and vulnerable items such as glass instruments and precision instruments

III. research direction of ecological packaging development

ecological packaging materials are not only a great revolution in the production of packaging material manufacturers, but also have received widespread attention in the world. Therefore, the research of ecological packaging should be considered from the whole process of development, design, production, use, abandonment and so on

nano plastics have excellent physical and mechanical properties, high strength, heat resistance, good gloss and transparency, high barrier, and excellent processing performance. They are eco-friendly materials and can be used for the packaging of food, various chemical raw materials, and toxic substances

the State Key Laboratory of engineering plastics, Institute of chemistry, Chinese Academy of Sciences/Center for Molecular Sciences has successfully developed a series of nano plastics such as polyamide (PA6 and PA66), polyester (PET and PBT), polyethylene, polystyrene, epoxy resin, and has realized the industrial production of some nano plastics. Nanocomposites have great potential in the food packaging market. For example, the film slice made of polyamide 6 nano plastic (nc-pa6) can be blown and extruded to prepare heat shrinkable casing film, biaxial tensile film and composite film. Compared with ordinary PA6, it has better barrier, mechanical properties and transparency

a degradable plastic synthesized by using nanotechnology to efficiently catalyze CO2 has been successfully developed by Guangzhou Institute of chemistry, Chinese Academy of Sciences. This degradable plastic polymerized with CO2 and propylene oxide can replace the fast food packaging containers widely used in the market at present, which not only solves the environmental problems caused by CO2, but also avoids the "white pollution" produced in the use of plastic packaging

gene technology is also one of the research directions. Using advanced gene artificial directional design splicing technology, plants can grow containers of various shapes and colors according to people's design requirements (even these containers can grow various patterns and patterns according to the pre design), such as the outer packaging of various milk, fruit juice, vinegar The outer packaging of all kinds of disposable tableware may grow directly from a corn plant reconstructed by gene cutting, and the medicine bottle in the future may be directly picked from a pepper plant created by genetic modification technology

China's anti-dumping enterprises involved in the case should prepare judicial relief as soon as possible

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the final result of the anti-dumping investigation of the U.S. Department of Commerce on frozen and canned warm shrimp from China and Vietnam: four of the 57 Chinese enterprises sampled, except Zhanjiang Guolian aquatic products, the other three sold the products involved in the case in the United States below normal value, with a dumping margin of 0.07% - 112.81%, 35 enterprises received an average tax rate of 55.23%, while other enterprises were ruled to have a tax rate of 112.81%

the "disastrous ruling" of the United States on Chinese shrimp products and its obviously unfair practices have affected the measurement accuracy, which has not only caused strong repercussions in the Chinese industry, but also been strongly opposed by American shrimp processing enterprises and retailers. Then, can the anti-dumping practice of the United States effectively solve the problem? Where should the Chinese enterprises involved go

anti dumping does not help the problem to be effective, so please check and solve it regularly.

"we will continue to pay close attention to the progress of this case." The head of the Fair Trade Bureau of the Ministry of Commerce believes that the U.S. shrimp industry itself cannot meet the needs of its domestic consumers. Imported shrimp products are not only the needs of the U.S. domestic market, but also create a large number of employment opportunities in the United States, which is in the interests of the United States itself. The United States should face up to this fact

the person in charge said that the reason why China's shrimp products exported to the United States are competitive is due to China's appropriate climatic conditions and low labor costs. Moreover, the enterprises in China's shrimp industry are mainly small and medium-sized enterprises, and it is impossible to export to the United States in a way lower than normal value

it is understood that many American shrimp processing enterprises and retailers are strongly opposed to it