New varieties of plastic film for food packaging

As people's requirements for quality of life and food safety continue to increase, more and more requirements and higher and higher standards are placed on the functionality of food packaging. Under this circumstance, the development of new varieties of plastic film for food packaging in various countries around the world is also very active, so as to meet the humanization needs of the market to the utmost.

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France introduced two new packaging films processed from ordinary polyethylene (PVC) materials to the market, which can be used to identify whether the packaged food uses genetically modified raw materials. Using this specially treated PVC film for packaging, it is possible to identify whether its package contents such as soybean oil are processed from genetically modified soybean material. Even for foods containing only 5%-10% of genetically modified soy, it can be clearly identified. France also introduced to the market a double-layer superimposed film dedicated to packaging meats. The outer layer is a high-density polyethylene film with special structure and properties, and the inner layer is edible paper. Packaging the meat with the film can solve the problem that ordinary materials packaged meat will be immersed in bleeding and grease, and will not easily separate on the meat and cause the surface to form a hard skin, so as to maintain the original color, fragrance and taste of the meat.

Recently, a British company successfully developed a new type of plastic food packaging, which has a passive and active barrier function, can effectively inhibit the infiltration of oxygen, even after the food bag cooking, the role will not diminish. The new plastic food packaging can not only prolong the storage period of the product, but also can directly use microwave heating, especially for instant noodle food packaging. This new package is composed of 6 layers of different materials. The first layer is polypropylene, which is a polymeric material with high oil resistance; the second and fourth layers are adhesive glues; the third layer is oxygen-blocking polymeric material EVOH; the fifth layer is an oxygen scavenger mixture and is called As an active barrier, not only foreign oxygen molecules can be prevented from entering, but also oxygen in the package can be adsorbed. The last layer is polypropylene material. In the new package, the oxygen scavenger can maintain its activity even in the presence of moisture, and thus can be extended. The shelf life of food.

Switzerland has recently developed, produced and marketed special cover films for microwave oven products – Simkashin. The film is not only resistant to high pressure, but also has good anti-fog properties. The use of this cover film is particularly useful for heating various dishes in a microwave oven, which can be quickly and conveniently heated for food. During the heating process, the pressure generated by water vapor can be safely released through the membrane. A plastics processing company in Switzerland has developed a chemically self-destructive plastic that can gradually dissolve and no longer pollute the environment. This chemically self-destroying plastic is sprayed with a specially formulated solvent that reacts with the plastic to gradually dissolve the plastic and become a substance that can be washed away by water. After the composite plastic film produced from this new type of plastic is packaged into food and beverages, once the package is torn, the inner layer coated with special reagents absorbs moisture in the air and reacts with the polymer with reactive groups. Slowly disintegrate like perforation.

According to overseas media reports, German scientists have successfully developed antimicrobial plastic packaging using medical expertise. The packaging is suitable for the packaging of liquid beverages such as milk and is an important change in the field of food packaging technology. Researchers from the German Processing Manufacturers and Packaging Technology Association used coating technology to apply a layer of antiseptic and antibacterial material to the plastic packaging film instead of adding preservatives to the food. This kind of coating can be realized by a composite resin or other based material and special technology.

plastic film

Affected by the trend of international packaging, domestic beer and beverage manufacturers began to use plastic film packaging in the product packaging process and gradually replace the traditional carton. The advantages of using plastic film packaging are: low packaging cost; can effectively reduce the accidents of burst bottles and wounds; solve the problem of contamination of the surface of the memory bottle during the circulation and stacking of the plastic turnover box; the scope of application is wide and can be used for glass bottles. The packaging of products such as metal cans and cartons can give consumers a refreshing feeling.

Canada developed a packaging film that can detect pathogenic bacteria. That is, a special coating is applied on the surface of ordinary food packaging film to enable it to detect special functions of bacteria, such as the detection film used for raw and cooked meat packaging. If the packaged meat food is not fresh, it is harmful. The bacteria content exceeds the food hygiene standard, and packaging with this film will make the original transparent and colorless packaging film become a warning color, so that the customer immediately knows that it is no longer edible. At present, foreign packaging industry has developed a large number of multi-functional composite films, such as: cold film can withstand -18 °C, -20 °C, -35 °C low temperature environment; PP moisture-proof membrane made of moisture-proof membrane; anti-corrosion film can be packaged perishable, acidity Large, high-sweet foods; special PE film corrosion resistance; pest-free film is added odorless insect repellent; biaxially stretched nylon 66 heat-resistant film instead of biaxially stretched nylon 6 film packaging food. Shandong Xinlik Plastics Co., Ltd. has successfully developed BOPE security film for packaging, which can play a good anti-counterfeiting effect on iodine-added foods. The anti-ultraviolet (UV) shrink film introduced and developed in China is used to package Aurora AE salad oil, which can protect the vitamin components in oil from UV radiation and protect the nutrients from damage.

The prospects for plastic packaging are very optimistic, making the market demand for plastic film packaging equipment greatly increased. At present, through the introduction of advanced foreign technology, domestically, more than 10 companies, including Guangdong Light Industry Machinery Plant Co., Ltd., Guangdong Light Industry Machinery Group Co., Ltd. and Nanjing Henghao Machinery Industry Co., Ltd., have developed plastic packaging machinery and sales. Strong momentum. The market for plastic film packaging machinery and equipment is promising. More companies will join this field in the future, and competition will become increasingly fierce. How to embody self-advantages and characteristics? Manufacturing companies should not only work hard at product quality, but should also develop equipment of different specifications and performance for the actual needs of different industries and enterprises of different sizes.

Bioplastics

According to overseas media reports, metabolix, which is engaged in research and development of bioplastics, and agricultural product giant Archer Daniel Midland (ADM) have reached an agreement to establish a 50-50 joint venture company to promote the bioplastic polyhydroxyalkanoates. PHA) commercial production. The two companies stated that the capacity of the PHA plant to be built is 50,000 tons/year, and the products can be widely used for packaging films. PHA's production is the use of microbial fermentation technology that converts agricultural raw materials such as corn into biodegradable plastics. It is reported that this kind of material has better heat and moisture resistance than other renewable resource plastics such as polylactic acid. Its use is also more extensive. The president of metabolix believes that the application of PHA will not compete with other recycled plastics because the plastics market needs multiple products to serve customers, and PHA can be seen as a supplement to polylactic acid, which are important varieties of renewable plastics. He hopes that metabolix and polylactic acid giant Cargill Road will become partners rather than competitors.

Japanese scientists and researchers from the pine wood research and development of a wood powder plastic packaging materials, by removing polyols from the wood, and then react with isocyanate, resulting in polyurethane. This wood plastic is extremely resistant to heat and can be biodegraded and can be used to make temperature-resistant packaging bags. Russian experts have added dehydrated mineral salts and enzymes to food packaging polymers. The inner surface of the packaging bag rich in these substances can absorb excess water and kill bacteria, thus improving the internal environment of the packaging bag. One type uses wheat flour to add glycerine, glycol, silicone oil, etc. 150 kilograms of pressure heat becomes translucent plastic film. The advantage of using wheat plastic to pack food is that it can be decomposed by microorganisms.

A rapeseed plastic packaging material has recently been successfully studied in the United Kingdom. It extracts three genes that produce plastics from bacteria that produce biopolymers, and then transfers them to plant strains of rape to produce a plastic polymer liquid over a period of time. After refining, it can be obtained as a kind of rapeseed. plastic. The packaging material or snack food packaging material made of this plastic can be decomposed on its own without any contaminated residue.

Source: China Food News