Varieties and Tolerances The main varieties of cherries in China can be divided into Chinese cherries and sweet cherries. Sweet cherries are best used for storage and export. Because of their high sugar content, the pulp texture is relatively hard and the fruits are large. There are many varieties of cherries, some of which are resistant to storage and transportation. Generally speaking, early and mid-mature varieties are not resistant to storage and transportation, and late-maturing varieties are more storable. Tart cherries are generally not used for long-term storage and are mostly used for processing.
Harvesting, post-harvest handling and quality issues The cherries used for storage should be properly harvested early, generally harvested one week in advance, and harvested with fruit to avoid mechanical injuries. Immediately after harvesting, the fruit is pre-cooled to 2 ° C and transported at a temperature not exceeding 2 ° C, which basically controls the rot caused by the pre-harvest infection of pathogens. Because the fruits of cherries are petite and not pressure-resistant, they should be in smaller packages, 2 to 5 kg per box. Surface depression is the main problem affecting the quality of sweet cherries. Post-harvest treatment and reduced pressure storage can reduce the incidence of surface depressions.
Storage method Cherries are mechanically refrigerated at -1 ° C to -0.5 ° C and 90% to 95% relative humidity, and can be stored for 20 to 30 days. The use of modified atmosphere storage, especially simple and easy-to-use spontaneous modified atmosphere storage, can obtain better storage effect. The general practice is to line a small packaging box with a polyethylene film bag of 0.06 to 0.08 mm. After piercing, store it at -1 to -0.5 ° C to maintain the oxygen and carbon dioxide in the bag at 3% to 5% and 10% to 25%, cherries can be stored for 30 to 50 days. It should be noted that the concentration of carbon dioxide cannot exceed 30%, otherwise, it will cause browning and odor of the fruit. In addition, in order to prevent the generation of unpleasant odor, the polyethylene film bag must be opened after the fruit is taken out of the cold storage.
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Acid and alkali resistant gloves, electrical insulating gloves, radiation protection gloves, medical gloves and other rubber gloves.
According to the rubber raw material or manufacturing process, it is divided into Latex Gloves and molded gloves.
Acid and alkali resistant gloves should be able to be used in sulfuric acid (density 1.32) or caustic soda solution (density 1.19) at 45°C. Electrical insulating gloves are divided into two types: high voltage and low voltage. High voltage can be used below 6000 volts (test voltage is 12000 volts). Low voltage can be used below 1000 volts. Medical gloves are divided into two types: light surface and wool surface (hair surface gloves or wrinkled gloves).
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According to the material, it is generally divided into plastic disposable gloves, latex disposable gloves, and nitrile disposable gloves;
Among them, plastic film gloves are generally used in non-professional occasions. The advantage is that they are cheap, but because plastic disposable gloves are not elastic, their durability and suitability are relatively poor;
Latex gloves are usually used in professional occasions, such as operating rooms, laboratories and other places that require high sanitary conditions. The advantage is that they have a certain degree of elasticity and are more durable, but they are not resistant to animal oil corrosion, and are easily corroded by contact with animal oil. More importantly, according to statistics, 2%-17% of people will have varying degrees of allergy to latex.
Nitrile Gloves, in addition to having the characteristics of latex gloves and improving the shortcomings of latex gloves, can first withstand the corrosion of animal oils and fats, and will not cause allergies.
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