Understand the knowledge of quick-freezing cold storage to solve all the incurable diseases of quick-freezing cold storage

Understand the knowledge of quick-freezing cold storage to solve all the incurable diseases of quick-freezing cold storage

Quick-freezing cold storage refers to a method in which food quickly passes through its largest ice crystal formation area and freezes quickly when the average temperature reaches -18°C. The temperature of quick-freezer is usually -15℃～-35℃. It is mainly used for low-temperature rapid freezing of food, medicine, medicinal materials, chemical raw materials and other items. It has the characteristics of fast cooling and good freshness preservation.

　　 1. What is a quick-freezing warehouse?

　　The so-called rapid freezing refers to a method in which food quickly passes through its largest ice crystal formation area and freezes quickly when the average temperature reaches -18°C. Food will undergo various changes during the freezing process, such as physical changes (volume, thermal conductivity, specific heat, dry consumption, etc.), chemical changes (protein denaturation, color change, etc.), changes in cell arrangement, and biological and Changes in microorganisms, etc. The characteristic of fast freezing food is to maximize the original nutritional value, color and fragrance of the food. In other words, in the freezing process, it is necessary to guarantee the speed certificate to make the above-mentioned various changes of food reach the maximum reversibility. Large-scale quick-freezing warehouses are part of the cold storage and are built together with other storage areas (low temperature storage, shade storage, etc.). If you want to build a small quick-freezer, you can choose a combined cold storage, which is what the industry calls an assembled type. Such an assembled cold storage saves costs, saves construction time, and has complete functions.

　　 fast freezing has the following advantages:

　　 (1) Avoid the formation of large ice crystals between cells.

　　 (2) Reduce the exudation of water in the cells, and less juice loss when frozen.

　　(3) The cell arranges the internal concentration of solutes and food arrangements, the time for colloids and various components to touch each other is significantly shortened, and the harm of concentration is reduced to a minimum.

　　(4) The food is rapidly reduced to below the temperature of microbial growth activity, which advantageously resists the increase of microbes and their biochemical reactions.

　　 (5) The short stay of food in the freezing equipment is conducive to improving the utilization rate and continuity of the equipment.

　　 2. Special attention should be paid to the planning of quick-freezing cold storage

　　Quick-freezing cold storage is different from several other cold storages. The quick-freezing cold storage has strong requirements for the refrigeration effect of the cold storage. The temperature and freezing power of the quick-freezing cold storage are qualified to start the quick freezing.

　　 1. Understand the usefulness of cold storage and go to the cold storage site to conduct field investigations to collect cold storage parameters. The detailed parameters of the cold storage site are very important. The actual size of the cold storage site and the surrounding environment directly affect the cold storage equipment used in the design of the quick-freeze storage and the construction drawings of the cold storage. 　　 2. According to the characteristics of the items to be stored in the cold storage, select the appropriate freezing temperature and freezing time. Different types of products have different temperature requirements. For example, the temperature requirements of tuna for quick-freezing are different from those of ordinary fresh products. The center temperature of the frozen food must reach -50 degrees to ensure the quality of the fish. Therefore, the quick-freezer's understanding of product characteristics and other characteristics must be accurate!

　　 After determining the above two points, select the cold storage equipment and cold storage spare parts for the quick-freezing cold storage.

　　 3. Precautions for operation and maintenance of quick-freezing cold storage:

　　 1. Avoid freezing and thawing cycles, freezing, and freezing of the building structure.

　　2. Maintain the floor to avoid freezing and damage.

　　3. The quick-freezing storage should be used in accordance with planning requirements, and the effects of freezing and cold storage should be fully utilized to ensure safe production and product quality, and to maintain the building structure of the cold storage. The warehouse must be handled by a special team, and the responsibility is assigned to everyone, every warehouse door, every piece of equipment, and someone is responsible.

　　4. The quick-freezing warehouse is made of heat-insulating materials. It has the characteristics of being afraid of water, moisture, heat, and cold running. It is necessary to keep the ice, frost, water, door and light off.

5. It is necessary for quick-freezing warehouses to reasonably use storage capacity, continuously summarize and improve product stacking methods, safely and rationally arrange the storage space and stacking height, and improve the utilization rate of cold storage. The stacking must be strong and regular to facilitate inventory, inspection, and access. .