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The composite modified atmosphere fresh-keeping packaging machine is a brand-new food and vegetable fresh-keeping packaging equipment developed on the basis of a vacuum packaging machine and a nitrogen-filled packaging machine. Its greatest feature is to solve the vacuum packaging plus high-temperature sterilization after food taste taste greater destruction, nitrogen filling packaging requires aseptic packaging and a large investment in the lack of. By using modified atmosphere modified packaging, it can ensure the original taste and taste of foods and ensure the authenticity and appearance of foods. First, the difference between preservation and shelf life When people buy food, they are used to paying attention to shelf life, and shelf life is a necessary condition for food safety. With the improvement of people's living standards, people's demand for food has not only focused on their safety, but also hope that the purchased food is fresh, so the concept of "preservation" came into being. The so-called "preservation" means that food can be guaranteed in terms of nutrition, color, taste and flavor under the premise of ensuring safety. Fresh-keeping food is original juice, original flavor, preservation will be able to maintain quality, shelf life may not be fresh. Second, composite modified atmosphere packaging (MAP) preservation principle Composite modified atmosphere fresh packaging also known as gas replacement packaging, internationally known as MAP packaging (ie Modified Atmosphere Packing). The principle of the composite modified atmosphere packaging machine is to use composite fresh gas (2-4 kinds of gas mixed according to the food characteristic ratio) to replace the air in the box/bag, change the external environment of the food in the box/bag, and inhibit bacteria (microorganisms) The growth and reproduction of fruits and vegetables slows down the metabolism of fresh fruits and vegetables, thereby prolonging the shelf life or shelf life of foods. 2. Atmosphere-preserved gas is generally composed of carbon dioxide (CO2), nitrogen (N2), oxygen (O2), and a small amount of specialty gases. CO2 gas has the effect of inhibiting the growth and reproduction of most spoilage bacteria and fungi, and is the main antibacterial component in fresh gas; O2 has the ability to inhibit the growth of most anaerobic bacteria, maintain the color of fresh meat, and maintain aerobic respiration of fresh fruits and vegetables to maintain freshness. The role of; N2 is an inert gas, with the food does not work, as a filler gas, and CO2, O2 and specialty gases composed of composite preservative gas. Different foods and fruits have different compositions and proportions of fresh gas. Third, the composite MAP packaging preservation technology key The key to composite MAP fresh-keeping packaging is the ratio of composite preservative gas control accuracy and gas replacement rate. Due to the different performance characteristics of food and vegetables, their ratio of fresh gas is quite sensitive. Therefore, a qualified composite modified atmosphere packaging machine should be equipped with a high-precision automatic gas mixing system, the proportion of error should be less than 2%, gas replacement rate is greater than 99.5%, otherwise its preservation effect will be greatly affected, and even some products than the preservation effect Ordinary sealing packaging is even worse. Whether the equipment is qualified or not should be based on the above two parameters. IV. Advantages of compound modified atmosphere fresh-keeping compared with other fresh-keeping methods. Preservation method Advantages Disadvantages Chemical antisepsis Fresh-keeping process is simple and has side effects; low in quantity, poor anti-corrosion effect, fresh-keeping freshness, long-lasting taste, taste change, large vacuum, high-temperature sterilization, shelf life, and shelf life. After long-term high-temperature sterilization, the taste, taste, and shape change greatly, and the nutritional components are destroyed. Nitrogen filling and fresh keeping can better maintain food taste, taste and original nutrition. High environmental requirements, aseptic packaging, and high investment costs. The composite modified atmosphere fresh-keeping packaging and preservation are completed at the same time, which can better maintain the original juice, original taste and original appearance of the food. The environmental requirements are relatively low and no large investment is required. Qualified equipment requires high gas replacement rate (≥ 99.5%) and gas mixing accuracy (error rate ≤ 2%), complex structure, and high equipment costs. V. Application of composite modified atmosphere fresh-keeping packaging The scope of use of modified atmosphere fresh-keeping packaging: (1) All kinds of stewed vegetables, stir-fries, and fish products; (2) Fresh livestock and poultry aquatic products; (3) Fresh fruits and vegetables; (4) Moon cakes Cake bean products; (5) pickled pickle products; (6) tea, Chinese herbal medicines and native products; (7) supermarket food distribution centers need to keep fresh. Sixth, how to choose a modified atmosphere packaging machine 1, there must be a high-precision gas automatic mixing device, its precision control requirements precise, the maximum error rate should be ≤ 2.0%, the ideal state ≤ 1.0%. The key to compound air conditioning and fresh air conditioning is to use a combination of precise and precise fresh preservation gas according to the characteristics of different foods, such as preservation of broccoli, gas mixing ratio of O2:4-5%, CO2:1-2%, and injury concentration of 5 %; N2: 95-97%, if the O2 content is low, it will cause anaerobic respiration and necrosis, and high O2 or CO2 content can not inhibit the respiration rate, affect the preservation period; when the CO2 exceeds its injury concentration, it will accelerate the broccoli The deterioration. Therefore, the core technology of MAP packaging and packaging machines must have a highly accurate automatic gas mixing device. The other core technology of MAP packaging and packaging machines is a high replacement gas replacement device (substitution rate of 95%-99.5%) because If the gas replacement is insufficient and the air remains too much, the desired preservation requirement cannot be achieved. Therefore, a qualified composite modified atmosphere packaging machine must meet the requirements of the above two core technical indicators. Otherwise, the equipment must be a "pseudohybrid modified atmosphere packaging machine." If such a product is purchased, it will inevitably cause economic loss to the buyer. 2. Manufacturers of composite modified atmosphere packaging and packaging machines must fully grasp the knowledge associated with food preservation. Modified atmosphere modified atmosphere preservation is a comprehensive and multi-disciplinary technology integration. Therefore, manufacturers of composite modified atmosphere packaging machines must have rich and comprehensive research on the characteristics of food and vegetables, pretreatment processes, food processing environment, equipment combinations, packaging materials and operating procedures. If the manufacturer does not have control over the characteristics of the food, how about food preservation? As a newly emerging product, the composite modified atmosphere packaging and packaging machine has just come out. Its many technical know-how is not very clear to consumers. Therefore, in addition to purchasing qualified equipment, customers should also require equipment manufacturers to provide a full set of technical support. Ensure that the customer's product achieves freshness. 3. Must have high-quality R&D manpower and research team. Whether the company has potential for development and how to guarantee the quality of the products. These need to have high-quality R&D personnel and professional research teams. If these are not backed up, the quality of the products will be passed. Whether it can win the trust of consumers, there are some questions. Therefore, when purchasing a product, not only the price and appearance of the product, but also the inherent quality of the product and the R&D capabilities of the manufacturing enterprise. 4. The rationality and quality reliability of the structure of the modified atmosphere fresh-keeping packaging machine is also one of the selected safety. The modified atmosphere fresh-keeping packaging machine is mainly used for food preservation packaging, and the packaging environment and the number of the flora of the packaging material have a great influence on food preservation. Impact, so the use of stainless steel and anti-corrosion materials is a must. In addition, because the heat seal film roll may be used up in a few days in the actual production process and is easily contaminated by bacteria, the heat seal film is placed in a closed environment and is not conducive to sterilization using ultraviolet rays or ozone. In short, before the purchase of air-conditioning equipment, it is necessary to observe and comprehensively compare and avoid the purchase of unqualified products and cause losses.
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