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The commonly used methods of crude extraction of animal fat are direct heating and steaming. At present, cooking method is mainly used in large-scale industrial production. The main advantages of cooking method for extracting animal oil are low cost, simple operation and no chemical reagent added. The extracted oil has higher safety.
Working principle: under the condition of pressure, add water vapor and heat to release oil from adipose tissue cells.
Main features: the product has light color, soft flavor and low free fatty acid content.
Technological process: raw material → dressing → rough cutting → washing → grinding → cooking → centrifugal impurity removal → precipitation → crude oil
First of all, select suitable oil raw materials, and then trim to remove blood clots, muscles, broken bones, fascia, lymph and other non adipose tissues, so as to avoid producing burnt smell or animal glue during cooking and emulsifying the oil.
Cut the finished raw materials into small pieces, then wash them to remove the surface dirt and odor, and drain them. They can be operated at 10 ~ 15 ℃ to prevent the deterioration of raw materials, increase the hardness and facilitate the grinding. Mincing raw materials with mincing machine is convenient for fat to escape and smelting time to be shortened.
Put the raw materials into the pressure tank, add steam cooking, denaturate the protein, destroy the adipose tissue cells, and make the fat flow out. Then the impurities are separated by centrifugation, and the crude oil is obtained after precipitation.
