jacob gf's Album: Blast Freezer Manufacturers Share Micro

Micro - freezing preservation is a preservation method that uses - 2 - 3 ℃ cooling to keep the water content of fish in a partially frozen state. It has a longer preservation period and a better preservation effect than ice storage and cold seawater. In particular, it can completely preserve the freshness of benthic fishes and freshwater fishes with poor freeze resistance. Which of the following Blast freezer manufacturers will share the methods of micro-freezing preservation? 1. Ice salt mixing method When fu ice is mixed with salt, the ice and salt melt rapidly, absorbing a large amount of heat in a short time, causing the temperature to drop rapidly. The larger the proportion of salt to ice in a certain range, the faster the ice melts and the lower the dropping temperature. When the proportion of salt is 29%, the temperature can drop to - 20 ℃. In production, 3% salt is usually added to crushed ice to reduce the temperature to - 3% for transportation or storage. However, as the ice melts quickly and the cooling temperature is relatively low, the ice water absorbs heat after the ice melts, and the temperature of fish also rises. In the preservation process, it is not as good as using water alone to maintain a low temperature for a long time. Therefore, ice-salt preservation is suitable for short-term preservation, or pre-cooling fish before ice storage in the temperature adjustment season. 2. Low-temperature brine micro freezing method Due to the large heat transfer coefficient of brine, the catches are immersed in low-temperature brine at - 1 - 5 ℃ and the cooling speed is very fast. The main equipment of the brine micro-freezing ship includes a brine micro-freezing tank, a heat preservation fish tank, and a refrigeration system. During operation, a certain amount of cold brine is prefabricated first, and then clean seawater is pumped into the micro-freezing chamber by a pump, and salt is added to make seawater reach about 10 Baume degrees. The temperature of brine was reduced to - 5 ℃ by refrigeration while the fish tank was cooled to - 3 ℃. Then the washed catch is put into a net bag rotating in a brine tank for slight freezing, and when the brine temperature rises again, the temperature is continuously cooled down to - 5 deg c to - 2 deg c in the center of the fish body. After the slight freezing, the catch will be transferred to the thermal insulation fish tank for bulk stacking, and the temperature of the fish tank will be maintained at about - 3 ℃ by blowing air to keep it cool. The concentration of brine after each slight freeze shall be determined and the corresponding amount of salt shall be added. The brine shall be replaced in time according to the pollution degree.    3. Slightly freeze with ice Before the fishing boat sails, the refrigeration unit keeps the temperature of the fish cabin at - 7 ℃. The caught fish shall be immediately buried in ice at a fish-to-ice ratio of 1: 3, and the cabin temperature shall be kept at - 2 ℃ when the fish is cooled and returned. information about Blast freezer : https://www.gf-machine.com/product/quick-freezing-equipment/