Characteristics and indexes of the hottest kiwi fr

2022-07-24
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The characteristics and indexes of kiwifruit storage under controlled atmosphere at low temperature in large tent

controlled atmosphere in large tent is a simple form of controlled atmosphere storage. Its obvious characteristics are: the method is simple and easy to master; The facility is simple and easy to operate. It is an economical and practical method of controlled atmosphere storage

1. Reference storage index

storage temperature -0.5 ~ 0.5 ℃

relative humidity 90% ~ 98%

gas composition O22 ~ 3%; Co24 ~ 5%

ethylene content C2H4 0.02 μ L/l

storage life 6 ~ 8 months

2. Variety characteristics

kiwifruit belongs to kiwifruit family, with a wide variety. At present, the Chinese Kiwi (also known as soft haired Kiwi) and delicious Kiwi (also known as hard haired Kiwi) have the highest economic value. "Hayward" and "Qinmei" are both delicious kiwifruit. Kiwi fruit is a kind of paddle fruit with respiratory peak, which is difficult to store for a long time under normal temperature? quot; Hayward "and" Qinmei "The two varieties can be stored for more than two months, and 6 ~ 8 months in a low ethylene controlled atmosphere storage. Because kiwi fruit is very sensitive to ethylene harmful gas, it should be stored separately during storage. It should not be mixed with apples, pears, bananas and other fruits, nor with garlic, onions and other vegetables, so as to avoid the quality degradation due to cross flavor. Low oxygen or high carbon dioxide concentration will cause great damage to fresh fruits, so during storage The gas composition must be strictly controlled

3. Low temperature controlled atmosphere large net storage: in addition,

1) the equipment selects transparent polyethylene or non-toxic polyvinyl chloride with a thickness of 0.2mm as the net material, which has a small risk of establishing a recycled plastic granule factory, to make a rectangular net, which is similar to a double

human mosquito net. It can be appropriately enlarged or reduced according to the number of stored fruits. Generally, it is appropriate to store 2 ~ 3 tons of fruits per net. A small silicon rubber cloth window of moderate size is embedded in the middle of the tent. The window opening area can be determined according to the number of fruits stored and the temperature of the storage. Generally, when 1 ton of fruits are stored at 0 ℃, the window opening area is about 0.4m2

2) installation of account the account consists of the bottom and top of the account. During installation, select a rectangular plot slightly larger than the bottom of the account according to the number of fruits stored and the stacking height, dig a small ditch about 10cm deep and 10cm wide, and lay the bottom of the account on the ditch, The value of waste pulp made by overseas bases of other countries above the account bottom is becoming more and more prominent. Put some bricks for fruit boxes or lay a layer of sand (pay special attention not to puncture the account bottom). Then put the precooled fruit boxes on the bricks, code them into ventilation stacks, and then buckle the top of the account onto the stacks. The bottom and the account bottom are tightly rolled together, buried in small ditches, and compacted with soil to prevent air leakage. It is best to support the large account with account frames made of steel and wood, The top of the tent should be made into a ridge or arch shape. After sealing, it is convenient for the condensate from the top of the tent to flow into the bottom of the tent along the wall of the tent to avoid directly falling on the fruit and corroding the peel. Several air intake holes can be opened on the account, and the air intake hole is composed of a bicycle valve core for air intake and sealing

3) the best storage conditions for kiwi fruit are: temperature -0.5 ~ 0.5 ℃, relative humidity 90 ~ 98%, oxygen content 2 ~ 3%, carbon dioxide content 4 ~ 5%, trace or no ethylene. All management measures should aim to achieve or approach this index, and the minimum O2 should not be less than 1.5% to avoid anaerobic respiration; Generally, CO2 shall not be higher than 5% to avoid CO2 Poisoning. This storage method should be used in conjunction with cold storage and controlled atmosphere equipment. Generally, the humidity in the plastic film is high, so no additional humidification is required. The gas composition mainly depends on the rapid nitrogen filling adjustment of the air conditioning equipment. At the same time, the closed cycle can also be used to partially remove carbon dioxide. A simple way to remove C2H4 ethylene is to use preservative to remove ethylene, or to carry ethylene out of the warehouse through gas circulation dilution. In order to accurately grasp the change of gas composition in the account, the gas shall be taken for measurement every 1 ~ 2 days. If the carbon dioxide is too high, the fresh gas shall be supplemented in time to adjust the gas composition in the account. In addition, the external sensory properties, weight loss, fruit hardness, soluble solid content, mildew and other indicators of fresh fruits should be tested and analyzed regularly to guide storage management

4) before fruit storage, equipment management must conduct a comprehensive inspection and test run of all equipment, master the equipment operation status, ensure the normal operation of fruit storage, and mainly check the independent intellectual property rights and technical standard system of environmental protection and high-performance surface materials, air conditioning equipment, pipelines and other facilities of refrigeration equipment. Other aspects of management, such as warehouse management, health management and safety management, are the same as the management of cold storage, which will not be repeated here. Please refer to relevant technical documents

source: Jiagong electromechanical

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