(I) Pre-cooling with crushed ice The crushed ice cubes are sprinkled on the garden products, or are placed in a water-resistant container together with the products, and the contact area with the garden products is expanded to increase the heat absorption effect. Applicable garden products are those that can tolerate direct contact with ice water and are also water resistant during transport, such as scallions, some cauliflowers, and root vegetables. (2) Precooling ice water A cooling method in which the garden product is immersed in ice water or sprayed with ice water to flush the surface of the product to achieve the cooling effect. Applicable to fruit vegetables, tender stem vegetables, fruits. (III) Air precooling 1. The indoor air-cooled garden product is placed in a cold store, and the field heat is replaced by cold air in the store. However, cold air is not easy to enter into the packing box, resulting in a slow cooling rate. If you improve the rate of indoor air flow, it helps to speed up the cooling rate. Suitable for all garden products. 2. Strong wind pre-cooling (also known as differential pressure air-cooled) Park products are placed in a freezer, depending on the product and have a different arrangement. The cold air is forced by one side of the product packaging and is in direct contact with the product to remove the heat from the field. The product temperature can be quickly reduced in a short time. Suitable for fruits, berries, fruit vegetables and cut flowers. (D) vacuum pre-cooling Park products into a closed storage body, and then quickly out of the air, the rapid evaporation of product surface moisture, resulting in rapid decline in product temperature. Suitable for leafy vegetables, and some stems and cauliflowers. Table 1. Comparison of pre-cooling methods: Pre-cooling method Expenses Equipment Pre-cooling rate Application range Ice-cold pre-cooling Cheap ice-making machine Fast onions, some cauliflowers, root vegetables, Stewed vegetables Pre-cooled ice water Ice machines Fast fruits, stalks, fruits Indoor air-cooled Medium cold All slower garden products Strong pre-cooled medium-strong wind Freezer Medium fruits, berries, fruit vegetables and cut flowers Vacuum pre-cooling Expensive vacuum store Fastest leafy vegetables, and parts Stems, cauliflowers We're professional Percutaneous Nephroscopy manufacturers and suppliers in China, specialized in
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