Composite Modified Atmosphere Preservation Technology Introduction 1. The difference between freshness preservation and shelf life When people purchase foods, they are accustomed 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 not only focuses on their safety, but also hopes 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. Preservation will guarantee the quality, and the shelf life may not be kept 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 air (2-4 kinds of gas mix according to the food characteristic ratio) to replace the air in the box/bag and change the external environment of the food in the box/bag to achieve the inhibition of bacteria ( The growth and reproduction of microorganisms slows down the metabolism of fresh fruits and vegetables, thus 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, maintain aerobic respiration of fresh fruits and vegetables, and 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. After a long period of extensive experiments and practices, Senrui has mastered a large amount of gas-to-distribution ratio data and achieved the best preservation effect of food and vegetables. 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 of the preservation effect Worse than ordinary sealed packaging. To judge whether the equipment is qualified or not, the above two parameters should be used as the standard. 4. Advantages of composite modified atmosphere fresh-keeping compared to other fresh-keeping methods. Currently, the commonly used fresh-keeping (or shelf-life) methods of food are mainly: (1) chemical preservation; (2) fresh-keeping under refrigeration; (3) vacuum-assisted autoclaving (4) vacuum nitrogen filling and fresh-keeping; (5) composite atmosphere modified fresh; (6) genetic and biological preservation. In the above five kinds of preservation techniques, chemical preservation is the use of preservatives to inhibit bacteria, but it is limited by consumers' concern about the side effects of preservatives; the defect of freezing and preservation is the change of taste after food is frozen; vacuum high-temperature sterilization The disadvantage is that it has a unique taste, taste, and nutritional damage to food; nitrogen-filled packaging can better maintain the food's taste, taste and nutrition, but the need for aseptic packaging environment, high environmental requirements, require a greater investment . Composite modified atmosphere preservation and genetic biological preservation is a brand-new preservation technology developed on the basis of the above tradition. It requires relatively low packaging environment, requires no large investment, requires only ultraviolet or ozone sterilization for the packaging environment, etc. for operators, etc. Soft environment to make the appropriate specification can be characterized by the need for high-temperature sterilization, so the composite modified atmosphere can ensure that the original food taste, taste and nutritional ingredients, and truly ensure the original juice, flavor, original appearance. Fifth, the scope of use (1) all kinds of Lu Cai, cooking, fish products; (2) fresh livestock and aquatic products; (3) fresh fruits and vegetables mushrooms; (4) moon cake cake bean products; (5) Kimchi pickled products; 6) Tea, Chinese herbal medicine and native products; (7) Various types of foods for supermarket distribution centers that need to be kept fresh. Six, for packaging materials (1) Packaging: PP, PE, CT, PET, nylon, aluminum foil and so on. (2) Heat sealing film: PET/CPP, PET/PE, OPP/CPP, OPP/PE, aluminum foil/CPP, nylon/CPP, EVOH, etc. (3) Packaging bags: PE, PET, CPP, OPP, nylon, EVOH, aluminum foil and related composite films. Company Name Suzhou Senrui Preservation Equipment Co., Ltd.
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