预冷指在水果蔬菜采收之后,运输或冷藏之前,尽快排出田间热,把其降到规定的低温。一般要求在24小时之内冷却到果实生理活性显著减弱的程度。这样不但可以延缓果实变质和成熟的过程(但要避免冷害),而且可以节省运输或贮藏中的制冷费用。由于预冷的这些优点,国外很早就在预冷的规模和技术方面有了较大发展。有些国家出现 Pre-cold refers to the fruit and vegetable harvesting, transport or cold storage, as soon as possible to discharge field heat, to bring it down to the required low temperature. It is generally required to cool to within 24 hours the extent to which the physiological activity of the fruit is significantly diminished. This will not only delay the process of deterioration and maturation of the fruit (but avoid chilling damage), but will also save the cost of cooling during transportation or storage. Due to these advantages of precooling, foreign countries have long been making great progress in the scale and technology of precooling. Some countries appear