The storage and transportation after flower harvesting is a complicated technology. The application of vacuum pre-cooling and fresh-keeping technology in the storage and transportation of flowers after harvesting has started. Vacuum pre-cooling after flower harvesting Preserves fresh flowers After harvesting Effectively regulates the environment Temperature can prolong its shelf life and maintain the fine quality of flowers. One of the important measures is cooling. After the flower is harvested, it will produce a lot of heat due to rapid breathing. This is the so-called field heat. This kind of field heat must be quickly removed, otherwise it is extremely unfavorable for the storage and transportation of flowers. Experiments have shown that if the flowers are not quickly removed from the field and harvested at room temperature (20°C) for one day after harvesting, it is equivalent to reducing the storage life of the flower at a suitable storage temperature (eg 0°C) for 5 to 7 days. Therefore, the harvested flowers should immediately undergo rapid cooling, ie, precooling. The harvested flowers go directly to storage or transport vehicles without precooling, not only requiring storage or transport vehicles to provide a large amount of cold, but also because the storage and transport vehicles are not designed to handle the full load of field heat. Flowers and flowers designed without pre-cooling can go directly into the library or stay in the car for a long period of time. In addition, there is a large difference between the temperature of the goods and the temperature of the warehouse, and it is easy to condense a large number of droplets on the top of the reservoir. These water droplets infiltrate the flowers and cause rot. The post-harvest pre-cooling treatment of the flowers requires only a small amount of cooling after the flowers enter the storage or transport vehicle, and only requires a certain amount of cold insulation and heat prevention measures, and the cooling efficiency is also high. There are many pre-cooling preservation methods for flowers, and one of the most effective ones is vacuum pre-cooling preservation. Vacuum pre-cooling preservation is based on the characteristics that vacuum can accelerate the evaporation of water. The flower is placed in a vacuum pre-cooling tank for vacuum treatment, part of the water in the flower transpires outward, and the latent heat is released with the water vapor in vitro, thus making the flower Rapid cooling. Vacuum pre-cooling is not only fast, cooling is more uniform, and because the pressure is reduced, the oxygen concentration of the flower tissue is reduced, and the concentration of ethylene released is also reduced, which can effectively maintain the freshness of flowers and prolong the storage period. The vacuum pre-cooling and preserving of flowers mainly controls the temperature and humidity by controlling the degree of vacuum in the pre-cooling process. The required degree of vacuum is related to the physiological characteristics of flowers in the pre-cooling tank, the number of flowers, the humidity of the flowers themselves, and the performance of the vacuum equipment. Problems and Countermeasures in Pre-cooling Fresh-keeping of Flowers in Flowers Pre-cooling and preserving fresh flowers in flowers will cause water loss in flowers. When the temperature drops by 10°C, the moisture loss will be 1%. If the temperature drops from 30°C to 5°C, the loss of water is about 3%. . If the water loss is serious in the flowers, the surface pores will be open, which will cause the freshness to decline and affect the quality of the flowers. Therefore, we must strictly control the flowers have a suitable humidity. A spray vacuum pre-cooling device has been applied in the United States to effectively avoid the phenomenon of dehydration in the pre-cooling process of flowers and to reduce the temperature rapidly. At present, the author mainly absorbs or sprays water on flowers before vacuum cooling. Water absorption means that the flowers are placed in a water-containing container before the pre-cooling. The flowers are allowed to absorb water for a period of time and then placed in a vacuum tank together with the container for vacuum pre-cooling. This method is mainly suitable for requiring pre-cooling and lower final temperatures. Flowers (if required 1 °C to 2 °C). In addition, for the flowers that have more buds after harvesting, about 1% of silver nitrate is also added as a preservative in the container water. The water absorption treatment affects the production efficiency because the container occupies a certain space in the vacuum tank. The water spray treatment refers to using a humidifier to uniformly spray and humidify the flowers before precooling so that the flowers have sufficient moisture before being precooled. Practice has proved that water spray treatment is simple and applicable. Vacuum pre-cooling has the features of fast cooling time (usually only 20 to 30 minutes), high efficiency, uniform temperature reduction, and no influence from packaging. It is especially suitable for precooling and preservation of articles with large surface area and volume ratio. The vacuum pre-cooling and preservation of flowers still needs to continue to explore and experiment. With the continuous improvement of pre-cooling technology, the performance of vacuum pre-cooling equipment is further improved, and the application of vacuum pre-cooling and fresh preservation in flower storage or transportation will become more and more popular.
Halal Gelatin Powder,Hydrolyzed Gelatin,Gelatin Powder
Fenghua Jade Motor Co., Ltd. , http://www.bosswholesaler.com