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Research and application of flexible packaging food that can be preserved and circulated under normal temperature in the United States at present, flexible packaging food is very active and prosperous in the U.S. market. Due to many improvements in its production technology over the years, it has promoted the rapid development and growth of food flexible packaging. However, the market of metal cans and barrier plastic cans has not yet been completely replaced by the flexible food packaging. It is only in the small dish food that continuously infiltrates into food, poultry meat, boiled peanuts and self heating two main meals, and gradually obtains the phased development of the market. After the market competition with low acid aseptic food packaging, food flexible packaging has been promoted into the world food industry as a high-quality processed food, becoming a decent member

heating sterilization of soft packaged food

the heating sterilization technology of soft packaged food aims to ensure that low acid food can be preserved at room temperature. At the initial stage of development, the quality of soft packaged food is better than that of traditional canned food, so it is also called soft canned food. Flexible packaged food has no chemical change when circulating at room temperature, and has nothing to do with microorganisms when stored at room temperature. In order to ensure the microbiological safety of flexible packaging food, the temperature conditions, sealing and production records in the production of flexible packaging food in the United States must be subject to the supervision and management of a specific authority - the U.S. Food and Drug Administration (FDA). One of the main reasons why the consumer sector has been late in accepting soft packaged food, plastic pallets, cups, bowls, bottles and sterile packaged food is the strict regulations and standards

low acid foods are prone to heat-resistant buds, which can reduce the risk of capital spore proliferation and the generation of food poisoning toxins. Therefore, they must be subject to high-temperature and high-pressure sterilization. The temperature for heating and sterilization must be above 100oC and maintained for a certain period of time. The specific temperature and time depend on the initial microbial pollution of different food raw materials, It shall be finally determined through the sterilization degree test at the corresponding temperature

ph 4.6 foods are also called high acid foods, such as tomatoes. Since the microorganisms in fruits and fruit drinks are relatively stable, only 1. Heat packaging below 0oC, such as low-temperature sterilization, is OK

in the traditional food processing and manufacturing process, low acid food needs to be heated and sterilized at 115oc after being filled into metal cans or glass containers and mechanically sealed. In order to achieve sterility, excess sterilization or over sterilization is usually carried out

1. Soft packaged food

the so-called soft packaged food is basically a packaged food made by replacing metal containers or glass containers with soft packaged plastic bags or soft packaged aluminum-plastic composite multi-layer bags. Its manufacturing principle and relevant rules are the same as those of canned food. However, almost all plastics are subject to the maximum heating temperature. 121oc is the limiting heat-resistant temperature. Compared with the two, even if the plastic is heated at a lower temperature, it will be deformed to meet the personalized color needs of customers. Generally, the heating and melting method is used for sealing and bonding of flexible packaging bags. At present, it can not be said that it has the same degree of reliability as the double crimping sealing method of metal cans. The advantage of soft packaged food is that it has good quality in the initial stage. The weight of the container is lighter than that of metal cans or glass bottles. It is easier to open and seal. Therefore, the flexible packaging food is more suitable for the requirements of social life types that pursue convenience. Moreover, the surface area of the flexible packaging bag is large, which is more suitable for the design and printing of packaging decoration, and has a better commodity attraction for consumers

2. Sterile packaged food

in the United States, sterile packaged food has a market history of more than 30 years and has become the mainstream of the food market. Compared with canned heated food, aseptic packaged food has high food quality due to its small heating amount. No matter what kind of material, structure and shape the packaging container adopts, it is possible. In 2002, the pudding was packed in toothpaste tubes; In 2003, norn1 ng sta r a rld DA1 ry farm ers went beyond the traditional concept and put coffee and milk drinks into the market in the form of toothpaste tubes. These products have been licensed by the regulatory authority for the quality of low acid food and have been registered. The sterilization process adopts a sterilization device including a spiral tubular heat exchanger. After sterilization with hydrogen peroxide, the packaging bottles are filled aseptically at a maximum speed of 300 bottles/minute

3. Non traditional packaging products

under the concept of replacing metal cans, about 20 years ago, plastic cans were developed and applied in actual production. Attention should be paid to the temperature control of heating sterilization. Due to the sensitivity of plastics to temperature, more strict temperature management is required than metal canned food. Although there are already commodity production designs such as microwave oven heating, there are actually a little changes and differences compared with traditional canned food. The wide mouth bottled tomato soup made of polyester plastic is a high-quality product. The resealed polyester bottle tomato soup that is easy to open is a product packed while it is hot. It is undoubtedly convenient for consumers who want to reheat it in a microwave oven. In addition, a paper container named RecA RT, which can be sterilized under high temperature and pressure, has been used in pet food packaging in Europe

4. Microwave sterilized food

compared with the traditional conduction heating method, the heating speed of microwave sterilized food is doubled. Through the microwave heating of the food in the pressure resistant container, the food can quickly reach the required temperature from the initial cooling in a few minutes and be less affected by the economic cycle. Hu]t1 the m in Sweden used pressurized hot water together with microwave treatment to complete the sterilization of fish or potato food with a thickness of less than 7mm) ILGWU

flexible packaged food means that the containers that can withstand high temperature and high pressure sterilization can be used to provide low acid flexible packaged food that is finally sterilized by high temperature and high pressure. Therefore, is there a mistake in the use of pallets as packaging materials

l materials for flexible packaging bags

in the United States, few enterprises produce and supply flexible packaging, There are also few food companies that have been recognized as "pet food". In North America, the companies that mainly produce soft packaged food are: worn1 CK, sop8 kc0, ame R1 qu8] and so on. In addition, they also produce pet food Ha ste R - foods, ka] Kan, nest]e, etc

enterprises mainly supplying flexible packaging containers include pech1 rley, py r8m1 D, Ka P8 K, cutwo0d, reyrlo]ds, sorloco, etc. In 2003, Israel's CLP packaging company also participated in the North American market

in, the commercial production successfully manufactured tuna and salmon food in flexible packaging. The flexible packaging bags are processed in Thailand or Ecuador, imported and supplied by py r8m1d company, and produced together with Asian companies, which are also the characteristics of this successful commercial production

in 2003, s8]8 Lee company successfully produced standard upright bag boneless chicken soft packaging food. The materials used for flexible packaging bags are generally composite bags made of polyethylene (PE)/aluminum foil (AL)/polypropylene (PP). The filling machine and heat sealing machine produced by Toyo Automatic Machinery Co., Ltd. or Mitsubishi Heavy Industries Co., Ltd. are mainly used. In addition, the new solid packaging machine of hyeworl company in South Korea also participated in the production

2. High temperature and high pressure sterilization

in order to maximize the heat movement during heating sterilization and minimize the damage during sealing or boiling, it is best to set a fixing or reinforcing device on the bag. And the sterilization process must be carefully and subtly controlled. In terms of high-temperature and high-pressure sterilization technology for flexible packaging bags, FNC company, st0ck company and Japan's Osaka production company (Institute) can produce high-quality devices and provide advanced technology

the production speed of the formed flexible packaging bag/filling/sealing machine is slow, which can not be compared with the high-speed production of traditional cans. The automatic device cannot be introduced into the sealing inspection, and the visual inspection is still required

3. Tray for flexible packaging

in the early stage of flexible packaging food production, the filling nozzle moves back and forth in the sealing part, which often pollutes the sealing part. Therefore, it is considered to use the tray, which is a more successful measure to prevent pollution at that time. Since the sealing surface of the tray is flat, the reliability of sealing is improved. Moreover, it is more convenient for consumers to use pallets than flexible packaging, and it is also convenient to eat. Therefore, several companies have developed high-temperature and high-pressure sterilized tray packaged food. The food in it has the same flavor as canned food

h0 rme] company has created different methods. It adopts the equipment produced by FNC company. In general, it is a high-quality seal combining amorphous and crystalline polypropylene (PP), which has been correspondingly combined in sterilization and commodity circulation; It is very convenient to use the collapse of tension fatigue when opening the seal. As a result, with the participation of H0 rme] company, top she]f company successfully developed D1 nty hoore brand stewed beef and other soft packaged meat products

when you walk into the baby food counter of American supermarkets, you can see that the cartons and containers of l1] ent Rees brand of Ge RBE r company are very eye-catching and attract people's attention. Partitions are designed inside the tray, and each partition area is filled with low acid meat dishes and fruit dessert. It can be stored at room temperature and heated conveniently in a microwave oven. It is a high-quality product that can be eaten by children, mothers and pupils. The tray is made of heat-formed multi-layer barrier plastic material and sealed with a barrier cover

although there are not many manufacturers and suppliers of soft packaged tray food, several pet food products packaged with barrier tray have also been successfully developed and supplied on the market, which shows its reliability and practicality. At the same time of the development of flexible packaging food production and lesser evil, many consumers accepted the commodity form of high-temperature and high-pressure sterilization tray, and its production increased month by month

4. Shelf life

in the sensory analysis of consumers, it is found that the color and flavor of soft packaged food deteriorate after several months. Therefore, the shelf life of about three years is the goal in the future. However, on the other hand, there are also unchanged results. Now, the U.S. Army is conducting research on active packaging as a support technology in order to eliminate oxidation in flexible packaging food

future prospects

in the process of heating and sterilization of low acid food, reducing D and calories and providing high-quality food are the research direction in the future. High temperature and high pressure sterilization of soft packaged food is one of the available technologies. And these technologies have been proved to have the same high reliability and reliability as the traditional canned food processing technology. At present, there is a problem that this food production technology and product have not been made available to all consumers. In the future, through further in-depth research on relevant issues, we will be able to achieve success above consumer expectations, achieve the goal of keeping soft packaged food at room temperature for more than three years, and achieve better results

reprinted from: China Packaging Industry

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