1. Storage Characteristics of Pineapple Pineapple, like mango and charcoal, is sensitive to low temperature, but the difference is that pineapple is a non-respiratory peak fruit with no obvious maturation. The storage of pineapple fruit is closely related to the maturity of harvest. The higher the maturity, the poorer the storage of pineapple. However, the mature fruits are hard and brittle and lack the inherent flavor of the fruit. About eight mature pineapples are most suitable for storage and transportation. The relationship between the storage tolerance of pineapple fruit and storage conditions is also very close. Pineapple is vulnerable to chilling injury. The risk of chilling is below 7°C. The symptoms of fruit after cold injury are: darker fruit, water-stained fruit, blackened heart, especially vulnerable when the fruit is removed from the storage. The bacteria infested and rotted. If it is used at normal temperature, it can be transported for 4 to 5 days on a short-distance basis. If it needs long-distance transportation, it needs to be chemically sterilized, or a refrigerated truck is used for temperature-controlled storage and transportation. The suitable conditions for storage and transportation of pineapples are: temperature about 10°C and relative humidity 85%-95%. Under this condition, the storage period can reach 2-4 weeks due to different species. If stored at 7 °C and containing 2% oxygen in the air-conditioned condition, the mold can be inhibited and the appearance of the fruit can be improved to achieve a better preservation effect. 2, commonly used in pineapple storage agents and their preservation methods (1) with compound polysaccharide preservatives sprayed pineapple fruit, dried, baskets stacked at room temperature, can effectively control the black rot, there is also a certain prevention and treatment of black heart disease effect. In the 20-30 days of storage, the control effect can be as high as 85%. The fruit of the leftover buds was treated with preservatives, and the incidence of black heart disease was much lower than that of those who did not stay. (2) Immerse the stem in a solution of 2.7 kg of biphenol and 378.5 kg of water. Store it in a well-ventilated container or pack in a polyethylene bag. The relative humidity is about 90%. Days or more. The suitable conditions for cold storage are: temperature 8-10°C, relative humidity 90%-95%. (3) The pineapple fruit is sprayed with a solution of 250 ppm naphthaleneacetic acid and 250 ppm of 2,4-D to inhibit the black heart disease to a certain extent. (4) The timely harvested pineapple is pre-cooled and heat-dissipated, wrapped with 1% diphenylamine or coated with 2.5% sodium propionate or coated with 1% sorbic acid aqueous solution, and placed in a fruit basket. Under storage conditions (temperature 7-10 °C, relative humidity 85%-90%). This storage is still edible for more than a month. 3, the pineapple's modified air-conditioning for storage of pineapple air-conditioning method commonly used film bag packaging or paraffin sealed. It is mainly to use pineapple self-breathing to form a low-oxygen, high-carbon dioxide atmosphere, reduce weight loss, postpone the yellowing of fruits, and slow the maturation process. After about one month of storage, it still retains fresh skin, green pedicle, full fruit, and constant meat quality, with good color, aroma, and taste. The specific methods are: (1) harvesting when pineapple peel is full-green, and soaking with 1000ppm 2,4-D sodium salt or 0.2% sodium bisulfite aqueous solution after picking, drying and selecting the good fruit and putting it into the box in advance In the film bag inside the basket, the bottom of the bag and the inside of the bag are covered with grass paper. After the fruit is full, cover the surface with a layer of straw paper and seal the mouth. (2) When the pineapple is ripe, it shall be harvested without injury. After precooling and radiating, it shall be immersed in the wax liquid that has been dissolved and cooled to the north latitude. After the small fruit in the upper layer of the pineapple is not taken out into the wax liquid, the fruit is evenly sealed. A thin layer of wax. After the pineapple is treated by one of the above two methods, the pineapple is stored at a temperature of 7-10° C. and a relative temperature of 85%-90% in a room or a warehouse.
According to the number of barrels, Piston-typed Mobile Milking Machine can be divided into two categories: Single-barrel Type and Double barrel Type.
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