Con số 4.6 hoạt động của một tủ đông impingement (lịch sự, frigoscandia, thiết bị, Thụy Điển)Conventional freezing .by increasing the pressure to 200 mpa, the freezing point of water is depressed, allowing the product to be anout-200C .without the water freezing. when the pressure is released, the water rapidly freezes with uniform nucleation of ice throughout the product(see chapter 11).an innovative freezing process has been developed for freezing sushi. sushi is raw seafood served as bite-sized pieces after topping the fish with sauce containing starch .during the freezing process ,starch and water separate from the sauce toppings, causing loss of stickiness and leading to failing apart of the toppings when packed up. In the modified process, the iqf product is fed into the chamber. Then the sauce and liquid nitrogen are injected sequentially to freeze layer of sauce onto iqf foods, coating each piece of product completely and uniformly at a coating ratio as hight as 50%. The freezing process is 20 times faster than the conventional quick freezing and five times faster than nitrogen freezing. The system can use all different sauces and gravies having wide viscosity range. A general multifunctional processing line for fish, bivalves, and shrimp has been developed in the Netherlands. The processing line is capable of pretreatment of different raw material, preservation, packing, and storage at a single site. one of the common operations is the cooking step, where mussels, clams, scallop, and shrimp can be cooked in the same machine. Another line of value addition, that is, battering and breading ,can be used for all of the species mentioned earlier. the fishery products are subjected to iqf freezing in a multipurpose spiral, belt, or flow freezer. The flexibility in the production line will enable investors to utilize it more efficiently to the maximum capacity
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