Developed countries in foreign countries have used air-conditioned fresh-keeping technology for food packaging as early as the middle of the last century, and have been favored by consumers. However, at the beginning of modified atmosphere packaging into China, it was not smooth and the market acceptance was not very high. In Europe and the United States, people like to go to the supermarket to buy ready-made products that are packaged, while Chinese people like to go to restaurants to eat, or to the market to buy fresh meat dishes and then go home to do. Therefore, when some of the International Atmospheric Packaging Machinery Corporations have just entered the Chinese market, there is basically no atmosphere-modified packaging.
Modified atmosphere packaging provides food with a longer shelf life, better freshness, better taste, color and appearance. The modified atmosphere gas in the package acts on the microbes and biochemical reactions in the food and thus delays the deterioration of the food. For example, the vast majority of fresh meat counters in domestic supermarkets merely store unsold meat at the counter for refrigerated storage. This kind of meat generally lasts for 1-2 days, but after modified atmosphere packaging, it can be greatly extended. Its shelf life is 5-7 days. Therefore, whether it is vegetables or fruits, meat or fish, the atmosphere-conditioning technology has become an inevitable trend for the processing and packaging of fresh foods.
Now, with the rapid growth of China's economy and the continuous improvement of domestic consumption levels, consumers are paying more and more attention to the safety and freshness of food. Fresh-keeping foods will become a new economic growth point for food production companies. At the same time, air-conditioning protection technology is an important part of the modern food processing industry quality monitoring system. It is a more reliable and cost-saving advanced technology for deep freeze or the traditional way of using preservatives.
The application prospect of modified atmosphere packaging in food
1. The application of CO2 in food packaging. A company in Sweden introduced packaging bags, containers and storage rooms filled with 100% CO2 gas to store meat. High-concentration CO2 can hinder the propagation of aerobic bacteria and molds, increase the stagnation period and exponential growth period of microbial growth, and play a role in anti-corrosion and anti-mildew. The method enables pork to be preserved for 120 days without the need for freezing. If it is repressurized, it can be stored for a longer period of time. This method has attracted great attention from meat exporting countries such as the United States and Australia.
Recently, U.S. experts adopted new technologies to make plastic packaging materials from CO2. That is, using a special catalyst, CO2 and ethylene oxide (or propylene oxide) are mixed in equal amounts to make a new plastic packaging material, which has the characteristics of glass-like transparency and impermeability; similar to polycarbonate and polyamide. Resin; does not completely decompose into gas at a temperature of 240°C; biodegradability does not pollute the environment and soil.
China has successfully researched and utilized nanotechnology to efficiently catalyze the synthesis of biodegradable plastics from CO2. That is, the use of CO2 to obtain plastic catalyst "pulverize" to the nano level, the catalytic molecules and CO2 polymerization, so that about 130g of catalyzed per gram of catalyst CO2, the synthesis of new packaging materials containing 42% CO2. As an environmentally friendly material with excellent degradability, it has broad application prospects.
2, N2 in food packaging applications. Nitrogen (N2) is an ideal inert gas. It has unique effects in food packaging: it does not react with foods and is not absorbed by foods. It can reduce the oxygen content in the package and greatly inhibit the growth of microorganisms such as bacteria and molds. , Slow down the oxidative deterioration and rot of food, so as to keep food fresh. Nitrogen-filled packaged foods can also be used to prevent the crushing of foods, food sticking or shrinking, and maintain the geometric shape, dryness, crispness, color, and flavor of foods.
At present, nitrogen-filled packaging is quickly replacing traditional vacuum packaging and has been used in fried potato chips and fries, oil cooking foods and so on. Affected by consumers, especially children and young people, nitrogen-filled packaging is expected to be applied to more food packaging.
3. Application of composite gas in packaged foods. The composite modified atmosphere fresh-keeping packaging is collectively referred to as MAP packaging in the world, and the used modified atmosphere fresh-keeping gas is generally composed of CO2, N2, O2 and a small amount of special gas. CO2 can inhibit the growth and reproduction of most aerobic spoilage bacteria and molds; O2 inhibits growth and reproduction of most anaerobic spoilage bacteria; maintains the color of fresh meat, maintains oxygen-rich respiration and freshness of fresh fruits and vegetables, and N2 acts as a filling gas.
The compound gas composition ratio is properly selected according to the type of food, preservation requirements, and packaging materials to achieve high preservation quality of the packaged food, good maintenance of nutrient content, ability to truly achieve the original traits, and the effect of delaying the shelf life of preservation. At present, the composite modified atmosphere fresh-keeping packaging has been widely used at home and abroad.
China's atmosphere packaging market opportunities and challenges coexist
From the above, we can clearly understand that modified atmosphere packaging has become a widely used method of food preservation. It is affecting the packaging of meat, cheese, fish, poultry, and other fresh and prepared foods abroad, and these Food sales in the global market. In China, the research on the preservation of modified atmosphere packaging began in the late 1980s. The application in production and commerce was only a matter of recent years. However, in view of the current development situation in China, the market of modified atmosphere packaging is favored by people in the industry. . However, at the same time, we should also see that the domestic air-conditioned fresh-keeping packaging equipment manufacturing industry still has a lot of good and bad situations, which affects the process of the food modified atmosphere fresh-keeping packaging market to some extent.
It is understood that there are many domestic food packaging technical materials, but the technology is backward, and emphasis on theory, practicality is not strong. China's food packaging industry should integrate into the new trend of international food packaging, occupy the initiative in the fierce market competition, and make the gap between China's food packaging industry and developed countries continue to shorten, we must introduce new technologies to absorb foreign food packaging. Therefore, it is extremely important to increase the development, research and application of new food packaging technologies in China. In order to meet the needs of modern society, the introduction of foreign advanced atmospheric packaging technology is an important condition for improving the technical level of atmospheric modified packaging, maintaining, improving and extending the nutritional value of food.
It can be said that modified atmosphere packaging is a challenge for China's food preservation and processing market. We believe that with the increasingly mature and rational market demand, China's air-conditioned food packaging will flourish in a short period of time and become the mainstream of consumer food purchase.
What is DVR Mini Camera
Dvr, which is called DigitalVideoRecorder in full, is a digital video recorder. Compared with traditional analog video recorders, dvr uses hard disk for recording, so it is often called hard disk recorder, also called DVR. It is a set of computer system for image computing, storage and processing. It has the functions of long-time video recording, recording, remote monitoring and control of images/voice and dynamic frames. DVR integrates five functions, including video recorder, picture splitter, PTZ lens control, alarm control, and network transmission. One device can replace a large number of devices in the analog monitoring system, Moreover, it has gradually gained advantages and popularity in terms of price.
The "digitalization" of DVR means that compression and storage technology is aimed at digital signals, rather than directly transmitting digitally encoded video images. Therefore, DVR must be deployed near the analog camera.
The function of DVR, with the increase of various voltage sensitive loads in the distribution network, puts forward higher requirements for power quality. However, due to system accidents in the power system, the voltage flicker, drop and other disturbances caused by the startup and shutdown of large equipment, lightning stroke and other principles are unavoidable. Moreover, in the current power grid, the ability to quickly restore power supply after power interruption is far from meeting the requirements of many sensitive loads. Therefore, it is necessary to provide users with stable and uninterrupted high-quality power when interference occurs. Dynamic voltage recovery (DVR) is the choice to solve the above problems today. DVR is connected in series to the feeder line that requires high-quality power to realize dynamic real-time voltage compensation for the line, so that the load end can get the desired high-quality power, and ensure the normal and uninterrupted operation of sensitive user equipment.
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