Vacuum cooling machine for fresh cut flower, leafy vegetable, mushroom

Fresh cut flower, leafy vegetable and mushroom should be rapidly cooled after postharvest, which is called precooling.
There are many flower precooling preserving methods ,  a very effective way among them is fresh vacuum pre-cooling. Fresh Vacuum pre-cooling  is based on the vacuum conditions accelerating the evaporation of the characteristics, the flower is placed in a vacuum precooling tank for vacuum processing, flower of part of the water transpiration outward, the latent heat release  with water vapor, so that the flowers of rapidly cooling. Vacuum cooling is not only faster, more uniform cooling, but due to the reduced pressure, so that the flower tissue oxygen concentration decreased, ethylene release concentration was also reduced, can effectively keep flower fresh and prolong the storage period.

Flower vacuum precooling preserving process parameters.
 The vacuum pre-cooling objects is mainly to control the degree of vacuum pre-cooling process to control temperature, humidity. The required vacuum degree and cooling groove flower physiological characteristics, sensitivity, flower flower itself humidity and vacuum equipment performance.

Problem and countermeasure in  fresh cut flower, leafy vegetable, mushroom vacuum pre-cooling process.
Vacuum precooling preserving process will cause the water loss phenomenon of flowers, each about 10 ℃ temperature decrease water loss 1%, such as the temperature from 30℃to 5℃, water loss of about 3%. Flower if loss level in severe, open surface porosity, leads to fresh degree decline, affect quality of flowers. So we must strictly control the flowers with a suitable humidity.

Absorbent means flower in cold water before the flowers after a period of time with the container together into a vacuum tank for vacuum cooling, the method is mainly suitable for the requirements of precooling end temperature lower flowers ( such as 1℃ to 2 ℃). In addition, for recovery after having more buds flowers, still container water by adding about 1% silver nitrate as a preserving agent. Water treatment by vacuum tank container occupy certain space, thus affecting the production efficiency. Spray processing refers to the precooling prior to use of the humidification machine flower uniformly spray heating, make flowers pre-cooling before the use of heating machine on flower uniformly spray humidification, the Hui pre-cooling has enough water. Proved by practice, water treatment is simple to apply.

 With short cooling time ( generally only 20 to 30 minutes ), high efficiency, uniform cooling, without influence of packing and other notable features, Vacuum pre cooling device particularly adapts to the object, which surface area to volume ratio is large. As the precooling process of continuous improvement, vacuum pre-cooling equipment to further improve performance, vacuum pre-cooling fresh flowers in the storage or transport of application will be more and more popular.