First, the difference between fresh and shelfWhen people buy food , accustomed to focusing on shelf-life, and the shelf life is a necessary condition for food security. As people 's living standards improve, people only pay attention to the requirements for food safety, but also want to purchase the food is fresh. So the concept of " fresh" came into being . The so-called "fresh " means food in the premise of ensuring safety , but also in nutrition vac tray , color, taste and flavor and other aspects can be guaranteed. Preservation will be able shelf , shelf not fresh.Second, the composite modified atmosphere packaging plastic case (MAP) preservation principles1 . Complex known as modified atmosphere packaging gas replacement packaging, internationally known as MAP packaging ( ie Modified Atmosphere Packing). Principle complex composite packaging machine is fresh gas ( 2-4 kinds of gas mixing ratio by food characteristics ) , the packaging box / bag of air replacement, changing external environment boxes / bags of food , to inhibit bacterial ( microorganisms ) of growth and reproduction , metabolism slows the speed of fresh fruits and vegetables , thus prolonging the shelf or shelf life of food .2 . Preservative gas generally consists of carbon dioxide (CO2), nitrogen (N2), oxygen (O2) and a few specialty gases. CO2 gas can inhibit the growth of most spoilage bacteria and molds propagation effect is fresh gas main antibacterial ingredients ; O2 inhibit the growth of most anaerobic bacteria and maintain the color of fresh meat , fresh fruits and vegetables to maintain aerobic respiration and maintain freshness role ; N2 is an inert gas , and food does not work, as the filling gas , and CO2, O2 , and specialty gases composed of packaging company complex fresh gas . Different food fruits and vegetables, fresh ingredients and proportions of gas is also different. SANRAD company through a long number of experiments , practice, a large quantity of gas composition ratio data , achieved the best food preservation effect of fruits and vegetables .Third, the composite MAP packaging preservation of key technologiesComposite modified atmosphere packaging technology is the key to controlling the ratio of fresh gas complex precision plastics products and gas replacement rate. As food fruits and vegetables of different performance characteristics itself , its proportion of the characteristics of fresh gas with considerable sensitivity. Thus , qualified composite packaging machines should be equipped with high- precision automatic gas mixing system , the proportion of error should be less than 2% , gas replacement rate is greater than 99.5% , otherwise the effect will be greatly affected preservation , preservation effect and even some products worse than ordinary sealed packaging. Equipment qualified to judge whether or not these two parameters should be the standard .Fourth, clear plastic packaging the composite Atmosphere advantage over other preservation ( shelf ) methodAt present, the common food preservation ( or shelf ) methods are mainly 1 ) Chemical preservation ;( 2 ) fresh frozen ;( 3 ) vacuum autoclave Shelf ;( 4 ) vacuum nitrogen preservation ;( 5 ) composite modified atmosphere ;( 6 ) Genetic biological preservation .In these five fresh ( shelf ) clear plastic box technology , chemical preservation is the use of antimicrobial preservatives , but consumers are concerned about the side effects of preservatives restricted ; shortcoming is that the taste of fresh frozen foods frozen after taste changes ; vacuum high-temperature sterilization the disadvantage is that the unique taste of food , taste , nutrition damaging ; nitrogen packaging can keep food taste better , taste and nutrition, but need to aseptic packaging environment , the environment is extremely demanding, require a larger investment . Atmosphere complex biological and genetic preservation is a new preservation technology developed on the basis of the above tradition , the packaging correspondingly lower environmental requirements without large investments, only the packaging environment with ultraviolet or ozone sterilization and operating personnel soft environment to make the appropriate specification , which is characterized by high-temperature sterilization without so complex atmosphere packaging to ensure the taste, flavor and nutrients of the original food , the real guarantee of food juice, flavor , original.Fifth, use of( 1 ) various Lucai , cooking, fish products ;( 2 ) fresh aquatic animal ;( 3 ) mushroom fresh fruits and vegetables ;( 4 ) moon cake cake soy ;( 5 ) pickle cured products ;( 6 ) tea, herbs and local products ;( 7 ) supermarket distribution centers need all kinds of fresh food .Six for packaging materials( 1 ) Packaging : PP, PE, CT, PET, nylon, aluminum foil.

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