On the new concept of the hottest food packaging

New concept of food packaging (Part 1)

all products should be packaged. With the rapid development of economy and the continuous improvement of quality of life, China's food industry is developing rapidly, and people's life philosophy and consumption mode are undergoing major changes. Packaging is also becoming more and more important in people's life, and new requirements are put forward for food packaging. The competition in the food market in this century largely depends on the competition in packaging quality. With the rapid development of science and technology, food packaging changes with each passing day, and the concept of food packaging also shows new characteristics. Food packaging should meet the consumption needs of modern people at different levels with diversification; Asepsis, convenience, intelligence and personalization are the new trends in the development of food packaging; Expanding the function of food packaging and reducing the environmental pollution caused by packaging waste have become the development trend of food packaging in the new century

1 aseptic packaging

with the higher requirements of consumers for the fresh-keeping function of food packaging, improving food packaging to prolong the freshness of food has become an important research topic for many manufacturers. At present, aseptic fresh-keeping packaging is the most popular in the food industry in various countries. Its application is not only limited to fruit juice and fruit juice drinks, but also used to package milk, mineral water and wine. One third of beverages in Britain have been packaged aseptically. Apple juice in Canada has been treated aseptically. Japan has developed mineral concentrated absorbent paper bags with calcium phosphate as raw material, which are used to pack vegetables and fruits and other foods, so that vegetables and fruits can get nutrition from mineral concentrated liquid, And absorb ethylene gas and carbon dioxide released by vegetables and fruits (it can inhibit the decomposition of chlorophyll and maintain the freshness. The U.S. market launched a fruit preservation bag made of natural activated clay and polyethylene plastic, which is like a very fine filter screen. Gas and water vapor flow through the bag, which increases the preservation period of fruits and vegetables by more than one time. Moreover, the bag can be reused for recycling, and the price is no higher than that of ordinary plastic bags. Sterile packaging accounts for a large proportion in food packaging, For example, the price of small bags of sterile milk is relatively cheap, the product flavor is good, and the storage time at room temperature is long. Manufacturers and consumers welcome this packaged product. This product not only overcomes the limitation of production region, but also removes the cold chain required in the transportation process, which is conducive to market expansion. According to statistics, the aseptic packaging of liquid food exceeds 70%, and the world consumes more than 100 billion carton aseptic packaging every year. At present, there are more than 3000 sets of aseptic packaging equipment in China, with an annual production capacity of more than 1.5 million tons. Tetra Pak of Sweden, SIG momei of Switzerland and American International Paper Company are the three giants that dominate the field of carton aseptic packaging. With the development of economy and the improvement of people's living standards, the energy used accounts for about 12% of the total energy consumption of the national economy, and the demand for convenience food is bound to 1 If the jaw is not properly clamped, it will greatly increase, which will certainly promote the further development of sterile packaging

2 green packaging

green packaging refers to the packaging that has no pollution to the ecological environment, is harmless to human health, and can be recycled and recycled. Today, people pay great attention to the ecological environment, and the green packaging of food has also become a necessity. Experts predict that green food will dominate the world market in the next 10 years, and green packaging is the pass for green food among consumers, which is of great significance for shaping the brand of green food. In order to coordinate social development and ecological environmental protection, countries all over the world regard reduction, reuse, recycling and degradability as the goals and means of ecological and environmental protection packaging. With the joint efforts of Tsinghua University and the Institute of Microbiology of the Chinese Academy of Sciences, the production of biodegradable plastic polyhydroxybutyrate (PHB) from waste molasses has been successfully completed; Using genetically engineered bacteria to produce biodegradable plastic PHB; Using hydrolyzed starch as raw material to produce biodegradable plastic PHB and its copolymer PHBV (as well as the modification and application of biodegradable plastic PHB). On this basis, we have achieved the first large-scale production of the third generation PHA hydroxybutyric acid copolymer hydroxyhexyl ester (PHBHHx) in the world. The biodegradable material poly (alkyl fatty acid PHA) synthesized by microorganisms has excellent biodegradability, compatibility, voltage resistance and photoactivity, The diversity of its structure, coupled with the performance of new materials brought by structural changes, makes this material have a broad application prospect in the direction of food packaging. German PSP company has recently developed a new process for the production of foam paper. The packaging materials produced by it can replace foam materials. This kind of foam uses old newspapers and flour as materials. First, the recycled old books and newspapers are cut into pieces, and then ground into fibrous pulp, which is mixed with flour in the ratio of 2 to 1. The mixed pulp is injected, extruded and pressed into cylindrical particles. During the extrusion process, the raw material becomes foam paper under the action of steam. Using this kind of foam paper as raw material, plastic packages of various shapes can be produced according to different needs. Foam paper can be formed at one time without chemical additives, and can be recycled and processed after use. Using modern super powder technology, raw materials are crushed into particles between 10 and 25 microns, which is called ultra-fine powder. In recent years, research has found that using ultra-fine powder technology to prepare starch based biodegradable plastics has obvious advantages. Superfine starch has small particle size, uniformity, great specific surface area, and contains huge surface energy, which significantly improves its fluidity and filling property. When used to prepare biodegradable plastics, it can effectively improve the mechanical properties of materials, and can greatly increase the amount of starch added on the premise of ensuring the use performance of materials, which is helpful to reduce costs, save oil resources, and develop the application of natural starch, It is of great significance to improve the biodegradation rate of plastics. The southern regional center of the U.S. Bureau of agricultural research uses soybean protein, added enzymes and other treatment agents to make soybean protein packaging film for food packaging, which can maintain good moisture, prevent oxygen from entering, and cook with food, which is easy to degrade, reduce environmental pollution, and avoid secondary pollution of food. Indonesian scientists invented the technology of making cardboard with algae. With two tons of dried algae, one ton of cardboard can be made. The quality of the made cardboard is not inferior to that of ordinary cardboard. And has been commercialized

3 functional packaging

with the rapid development of packaging technology, in recent years, a number of new packaging products with unique functions and diverse varieties have been developed at home and abroad, which are refreshing and have been favored by consumers and operators. Recently, FDA has approved the application of a UV barrier in food packaging in the United States. Sunlight and fluorescent lamps in warehouses contain ultraviolet rays, and this ultraviolet barrier added to transparent PET packaging materials can effectively block ultraviolet rays and prevent any changes in the color, smell, taste and nutritional value of the items in the packaging. Transparent packaging materials can let consumers know the quality and appearance of products. A Japanese company has introduced a kind of anticorrosive paper that can be used for food packaging. Its production process is to dip the base paper into an ethanol solution containing 20% succinic acid, 33% sodium succinate and 0.07% sorbic acid, and then dry it. The food packed with brine with this paper can be stored at 38 ℃ for 3 weeks without changing its quality. Another Japanese company produces a new type of packaging paper that can prevent food from mildew and deterioration for a long time without damaging food flavor. The paper is made by fusing special monoglyceride, dissolving in the aqueous solution of water and ethanol, and then spraying or soaking on the paper. It can keep the freshness of fruits and can be used to package all kinds of food. Most green foods contain a large amount of chlorophyll, which will undergo photosensitive oxidation reaction under light irradiation, leading to food decay. Goldham, a scientist at the Fraunhofer Institute of processing and packaging technology in Germany, recently invented a special method to "dye" plastic films with chlorophyll. After this treatment, the film used to package food can prevent the oxidation of chlorophyll in green food, greatly extending the fresh-keeping period of green food since 2011. At present, the pursuit of increasingly perfect preservation function has become the preferred goal of food packaging. Singapore developed and produced a kind of fresh-keeping packaging paper. This paper contains bacteriostatic and bactericidal agents. Apples stored with this paper will open half a year later, and the fruit will still be full. Another kind of fresh-keeping paper can keep citrus fresh for 3 months and litchi fresh for more than 30 days. Yingde has jointly developed a package using deoxidizing materials on the inner walls of containers and lids. These deoxidizing materials "eat" the excess oxygen, so as to achieve the purpose of keeping fresh and extend the shelf life of products. The United States has also introduced a composite cap with oxygen absorption function as a beer bottle cap, which can extend the shelf life of beer from 3 to 4 months to 4 to 6 months. Japan has recently successfully developed a new plastic composite packaging material that can inhibit the production of dioxin. This kind of material is made by mixing PP and talc powder evenly, and then it is made into a container after heating and forming. This material itself will not produce HCl and other gases related to the production of dioxin, and can adsorb and fix the HCl gas produced by other wastes during combustion, so as to inhibit the production of dioxin. American researchers put a plastic film containing a chemical called ain090rb in the food packaging bag, which can remove the oxygen in the packaging and keep the packaged food from deterioration for a long time. The chemical substance is in a dormant state until it is irradiated by special light waves. When exposed to special light waves, the chemical action begins to appear. That is to say, when packaging food, there is no need to carry out complex deaeration treatment, as long as the last process of food packaging is irradiated by special light waves. Russian experts added dehydrated Acidifiers, various mineral salts and enzymes to the polymers of packaging materials. The surface of the packaging bag rich in these substances can absorb the excess water in the packaged food, kill bacteria, and improve the internal environment of the packaging bag. At the same time, the enzymes in the additives can also regulate the smell of food and create a living space for the nutrients in food

it is suggested to link the industrial extension with the development of new energy vehicle industry to plan 4 intelligent packaging

intelligent packaging is usually made of photoelectric temperature sensitive, humidity sensitive, gas sensitive and other functional packaging materials. It can display some important parameters such as temperature, humidity, pressure, sealing degree and time of the packaging space. This is a very promising functional packaging. Sichuan Haodong High Tech Co., Ltd. recently successfully developed a novel anti-counterfeiting packaging film. The advantage of this anti-counterfeiting packaging film is that it is colorless and transparent, and will not affect the patterns on the packaging bags, cartons, iron boxes and glass bottles of goods. Under the illumination, the laser holographic patterns and words that cannot be imitated can be obviously displayed. If it is used in the automatic packaging production line of commodities, the overall anti-counterfeiting effect of commodities will be more ideal. This novel anti-counterfeiting packaging film is colorless plastic film, with a thickness of 10-100 microns. On the film, there are concave convex indentation patterns and words with different depths, as well as two-dimensional and three-dimensional geometric figures, which are embossed on the metal plate specially made by laser holography, with a strong sense of three-dimensional and clear layers. The depth of concave convex indentation is generally. The warning package can indicate whether the food has deteriorated. It is composed of three separation layers: the inner layer is a porous water seepage layer