Fresh-keeping packaging technology for various agricultural and sideline products

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Fresh-keeping packaging technology for various agricultural and sideline products

New method of grain preservation: Bulgarian agricultural experts have invented a simple and economical new method of grain preservation. When the crops are harvested, the seeds are allowed to dry slightly, put into a large polyethylene bag, and then sealed. The grains preserved in this way will neither volatilize moisture nor mold, and can be stored until the spring of the following year without any reduction in the nutritional content of the grains.

Rice fresh-keeping bags: A Japanese company has launched a strong-sealing bag made of a plastic called "chikron" that has excellent oxygen barrier properties to package new rice , The fresh-keeping effect is particularly good, and the color, aroma and taste of the rice can be kept unchanged for a long time, and the carbon dioxide generated in the bag also has the effect of preventing insects and mildew.

New way to keep fruits and vegetables fresh: A US company has developed a new way to keep cut fruits and vegetables fresh. The researchers made a special covering using cheese and acetyl monoglycerides extracted from vegetable oils. The transparent, edible, film-free flakes were pasted on the surface of cut fruits and vegetables, preventing Dehydration, preventing the fruit from turning black, and preventing the invasion of microorganisms.

Fruit and vegetable fresh-keeping film: Japanese experts have developed a one-time-use fruit and vegetable fresh-keeping film, which is composed of two layers of nylon translucent film with extremely strong water permeability, and sand syrup with high osmotic pressure is installed between the two layers. The fresh-keeping film is used to package fruits and vegetables, which can slowly absorb the water seeping out from the surface of the fruits and vegetables, so as to achieve the purpose of fresh-keeping.

Edible fruit preservative: A UK company has made an edible fruit preservative, which is a translucent emulsion of sucrose, starch, fatty acids and polyesters that can be sprayed, painted or dipped The method covers the surface of apples, oranges, watermelons, bananas, tomatoes and other fruits, and the fresh-keeping period can reach more than 200 days. Since the preservative forms a layer of sealing film on the surface of the fruit, it can prevent oxygen from entering the inside of the fruit, thereby prolonging the ripening process of the fruit and maintaining freshness. This preservative can be eaten with fruit.

Fruit preservation packaging box: A Japanese paper company produced a fruit preservation packaging box. It is to add a layer of polyethylene film to the corrugated paper lining paper of the corrugated box, and then apply a layer of waterproof wax coating containing a small amount of fruit disinfectant to prevent the evaporation of fruit moisture and inhibit breathing to achieve the purpose of keeping fresh. Packing fruit in this box will keep the fruit fresh for a month.

Electronic fresh-keeping machine: France has made an electronic fresh-keeping machine. Put this machine in the fruit and vegetable pantry, and use the fruits and vegetables stored in it to pick them fresh for 75 days. This fresh-keeping machine uses the negative oxygen ions and ozone generated by the high-voltage negative electrostatic field to achieve the purpose of fresh-keeping; the negative oxygen ions can enable the enzymes to purify the metabolic process of fruits and vegetables, thereby reducing the respiration process of fruits and vegetables, and reducing the generation of ethylene, a fruit ripening agent; Ozone is a strong oxidant, as well as a good disinfectant and bactericide, which can kill and eliminate microorganisms on fruits and vegetables and the poisons secreted by them, inhibit and delay the decomposition of organic matter, thereby prolonging the storage period of fruits and vegetables.

High-temperature treatment and preservation method: The United Kingdom invented a high-temperature storage technology for bulb vegetables. The technology utilizes the inhibitory effect of high temperature on the germination of bulb vegetables, and controls the temperature of the storage room at 23°C and the relative humidity at 75%. In this way, the purpose of long-term storage and preservation can be achieved. It is said that onions can be stored for 8 months under these conditions.

Decompression treatment preservation method: Japan has developed a decompression storage technology for fruit and vegetable preservation. This fresh-keeping method mainly uses measures such as reducing air pressure, cooperating with low temperature and high temperature, and using low-pressure air for circulation to create a favorable storage environment for fruits and vegetables. The low pressure of the storage room is generated by the vacuum pump to remove the indoor air, and the low pressure is controlled below 100mm Hg, and the low is 8mm Hg. The relative humidity in the air is controlled by a humidifier installed in the room, generally above 90%. This method reduces the indoor oxygen content during pumping, so that the respiration of fruits and vegetables is maintained at a low level, and at the same time, some gases such as carbon dioxide and ethylene are excluded from the room, which is conducive to long-term storage of fruits and vegetables.

Fruit and vegetable preservation method by air: In order to keep fruits and vegetables fresh during air transportation, a company in the United States has invented a new method of reducing oxygen and increasing nitrogen content in the packaging box to keep fruits and vegetables fresh. The method uses a new type of air-conditioned box for air transport, which has a special film that absorbs oxygen molecules and allows nitrogen to pass through. In this way, after entering the packaging box through the film in the air, the nitrogen content in the box can be as high as 98%, so that the respiration of fruits and vegetables is slowed down and the purpose of keeping fresh for a long time is achieved.

New fruit and vegetable fresh-keeping bag: A company in the United States has launched a new type of fruit and vegetable fresh-keeping plastic bag, which can prolong the fresh-keeping period of fruits and vegetables and reduce the loss of fruits and vegetables due to excessive ripening. This kind of packaging bag is made of a mixture of natural active clay and polyethylene, which is like a very fine filter screen. The gas and moisture generated during the ripening process of fruits and vegetables can pass through the packaging bag, and it is not easy for fungi to grow in the bag, so that the fruits and vegetables are not easy to breed. The freshness is more than doubled.

New packaging for transporting live shrimp: A food company in Hokkaido, Japan, has successfully developed a special packaging for transporting live shrimp in order to solve the problem that citizens cannot eat live shrimp. The package uses polyethylene as the inner layer and styrofoam as the outer layer, with crushed ice between the two layers. The inner layer should prevent water leakage, and the outer layer should prevent damage. In the polyethylene inner tank where the live shrimp move, put sterilized seawater and a certain amount of oxygen, and then seal it with a cover for transportation. Using this method, the survival rate of live shrimp can be maintained at more than 90% within 24 hours even under the condition of outside air temperature as high as 40°C. When the outside air temperature is low, the survival rate of live shrimp is a little higher.

Vacuum packaging of aquatic products using a vacuum cleaner: A Japanese company has developed a simple vacuum packaging device that uses the suction of a vacuum cleaner to degas and pack aquatic products. It is said that simply connect a household vacuum cleaner, put the upper part of the plastic bag containing the aquatic products in the packaging, and then the air can be extracted to complete the packaging. Using this packer, the aquatic products of different sizes can be vacuum-packed, which is suitable for small-scale aquatic product processing departments.

Water-soluble pesticide packaging film: British Paragian Company has produced a new type of polyethylene film that can be dissolved in water, which has been used as packaging for accurate quantitative pesticides before use in water. This packaging film is mildew-free, anti-static, heat-sealing, and can be colored and printed with patterns. It is a one-time use item, which can effectively ensure that the gas in the package does not leak, and can resist the corrosion of various chemical pesticides.

The above are the preservation methods of various agricultural and sideline products. For more information on preservation, please consult Zhejiang Mingwei Machinery Co., Ltd., focusing on the production of modified atmosphere packaging machines.


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