Research on Packaging Materials and Ecological Packaging Design (II)

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 packaging 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.

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 CO2 synthesis has been successfully developed by the Guangzhou Institute of Chemistry, China Academy of Sciences. The degradable plastic polymerized with co2 and propylene oxide can replace the fast-food packaging containers widely used on 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.

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