Research on Preservation of Fresh Fruits and Vegetables in Vacuum Precooling Equipment

To ensure that the freshness of fruits and vegetables has become one of the most important topics at present, in particular, the pre-cooling technology before and after the preservation of fruits and vegetables is more critical, and the advancement of pre-cooling technology will help to significantly extend the shelf life of fruits and vegetables. , and further strengthen the competitiveness of domestic and foreign agricultural products. The harvested fruits and vegetables are quickly removed from the field heat before transportation, storage or processing. The fresh quality of the product is called pre-cooling, and the vacuum pre-cooling is the effect of evaporating the moisture of the fruits and vegetables in a vacuum environment to achieve cooling effect. The main advantage is the very uniform cooling of fruits and vegetables in a short period of time, which is now widely appreciated by Taiwan's agricultural units.

The plan was entrusted by the Taiwan "Council of Agriculture" to integrate the technology of the university (National Taipei University of Science and Technology) in vacuum and refrigeration and other related fields to complete the development of vacuum precooling equipment for full-automatic mass production and laboratory use, and related to Taiwan. The agricultural product production cooperatives carried out research and development on the technology of pre-cooling and preservation of fruits and vegetables. As a result, it was found that in vegetables, the temperature of all kinds of vegetables could be reduced to about 4°C in about 7 minutes, and the experiment was also conducted on the cabbage produced in Lishan, Taiwan. It was found that inside and outside temperatures of cabbage can reach an average temperature of 6°C or lower within 20 minutes. This research result will significantly extend the shelf life of vegetables, strengthen the storage and distribution system of agricultural products across the Taiwan Strait, and significantly increase the international competitiveness of agricultural products. The vacuum precooler developed in this plan has a program-controlled automatic control system and a humanized solution control operation interface to provide the user with full automatic operation, reducing process errors and improving the accuracy and yield of the process.

Research methods Under the efforts of agricultural research institutions, Taiwan has been quite successful in the development of agricultural products. However, because Taiwan is located in a subtropical climate and is vulnerable to typhoons in summer, agricultural products are often damaged and not enough for Taiwan's local needs. As a result, prices are too high. In winter, due to the warm and stable climate, agricultural products are often over-produced and even low in price. Therefore, how to effectively use the characteristics of the local climate in Taiwan to make the management, storage and transportation of agricultural products in Taiwan a more effective management is also very important.

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