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Quality assurance requirements and technology of agricultural and sideline products packaging (Part I)

the combination of deep processing of agricultural and sideline products and packaged products is the general trend, and it is also a systematic and overall project. The development of agricultural and sideline products packaging will be an indispensable task with the development of agricultural production and trade. The packaging market of deep processing of agricultural products has a broad prospect, which will bring a win-win situation between agricultural production and packaging development

1 fruit

1) quality assurance requirements

fresh fruit is a living body, which is still breathing after harvest and carrying out vigorous life activities. Before fruit picking, it breathes on the tree, and the nutrition and water consumed by metabolism are supplemented by the branches and leaves of the tree, while after harvest, it consumes its own nutrition and water to maintain the process of life. If the fruits are not preserved in time after harvest, they will lose water, wilt, deteriorate in quality and decay and lose their edible value in at least 3 to 5 days (strawberries, lychees, longans, cherries, etc.) and more than 10 days and a half months (peaches, pears, grapes, etc.). Although the physiological characteristics of different fruits are different, post harvest discoloration, water loss, flavor change and decay are common problems. Therefore, the fruit should reduce its respiratory intensity as soon as possible after harvest, inhibit the metabolic process, delay aging, reduce the consumption of nutrients, and maintain the resistance and flavor quality of the fruit

2) technological progress

there are many ways to preserve fruits after harvest. Low temperature and controlled atmosphere are the most widely used storage methods in commerce at present. Because low temperature and controlled atmosphere can effectively inhibit the respiratory intensity of fruits, reduce the production of ethylene, delay aging, reduce water loss, maintain the hardness and color of fruits, inhibit the growth of bacteria, and significantly prolong the storage and preservation time of fruits. Spontaneous modified atmosphere film packaging (map) is a new type of modified atmosphere storage or sales packaging developed in recent years. It has transparent? It is widely used as fresh-keeping packaging for fresh fruits and vegetables due to its breathable and moisturizing characteristics? Map has the characteristics of controlled atmosphere balance. It can effectively control the concentration of oxygen and carbon dioxide at 3% - 10%, so as to effectively inhibit enzyme browning and bacterial growth and reduce water loss. Map uses the characteristics of oxygen consumption and carbon dioxide emission after fruit is bagged and sealed, so as to reduce the oxygen content in the bag and increase the concentration of carbon dioxide, so as to achieve the effect of spontaneous air regulation. The development of map has made the marketization of many fresh fruits and vegetables faster and faster. In Britain and France, the commercialization of map has reached 40% and 25% respectively

2 fresh meat

1) quality assurance requirements

the total output of pork, mutton, beef and other meat produced in China accounts for about one third of the world's total output. There are problems such as backward slaughtering technology, serious phenomenon of private slaughtering and disorderly slaughtering, and poor health quality, which are far behind the developed countries in the world

after all, raw meat is raw meat and different from cooked meat. Even those pigs, cattle, sheep and chickens slaughtered after passing the quarantine should pay attention to the health and safety in the process of storage, transportation and marketing, otherwise they will be polluted and affect the health of consumers. It should be said that the pre-sale packaging of pigs, cattle, sheep and chickens is a positive measure conducive to the health and safety of raw meat. The significance of pre-sale packaging of raw meat is that it can play a positive role in the health and safety of raw meat and the health of consumers

2) technological progress

map fresh meat packaging, which appeared in the U.S. market in the mid-1990s, now also appears in China? The advantages of map are: ensuring sanitation, reducing the cost of the whole commodity, reducing logistics costs, extending the shelf life of fresh meat, etc. Map is the abbreviation of "fresh meat inflatable packaging technology". It appeared in the United States in the mid-1990s and is currently popular in Europe

Japan Central Chemical Co., Ltd. is the first enterprise to provide this packaging system in China. It locates the market in large and medium-sized cities and faces large and medium-sized meat processing enterprises. Map packaging system has the following advantages: packaging in the processing site of fresh meat can ensure the most important food hygiene for consumers; The shelf life can be extended by more than 3 times; Pass on B. choose some secondary fixtures to fill each box more according to the non-standard configuration or expanded configuration. If the change-over switch is turned on the "fast back" gear, the fresh meat package is filled with nitrogen, and map is filled with 80% oxygen and 20% carbon dioxide. Oxygen keeps the meat fresh and beautiful, and carbon dioxide can well inhibit the survival of bacteria, which effectively extends the shelf life. Fresh meat in ordinary packaging began to deteriorate after twoorthree days, while meat in map packaging remained fresh after twoorthree days. The shelf life of meat in traditional packaging is only about 2 days, and it can only be discarded if it is not sold at the expiration. However, this packaging can be used for a long time. ④ press the pull-down extension key, and the collet on the instrument runs upward to start stretching the sample. At this time, the force value and elongation are instantly cleared, and the freshness of the sold meat is gradually increased from zero, so as to reduce waste? Using map packaging can reduce the distribution frequency and save logistics costs

(to be continued)

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