As we all know, fishmeal is a high-quality animal protein feed, which is an important part of today's animal balanced diet. Its crude protein content is over 60%, the amino acid composition is balanced, and various essential amino acids are rich in fat-soluble vitamins (A, D, E) and B vitamins (B12B2), which also contain more iodine and selenium, also contain unknown growth-promoting factors, which are beneficial to the growth and development of livestock and poultry. The quality of fishmeal is better in lighter color, higher protein content, lower crude fat and coarse ash.
At present, there are mainly three production methods, namely, soil method, dry method and wet method. At present, these three processing methods are combined in China. The raw material required for the processing method of the puffed fish meal is dry fish, so the processing method of the puffed fish meal can be classified into a dry processing method.
The main equipment of the puffed fishmeal is a special puffing machine for fishmeal. The working principle of the puffing machine is: the material is fed into the puffing machine, and the screw spiral pushes the material to form an axial flow. At the same time, due to the mechanical friction between the spiral and the material, the material and the barrel and the material, the material is strongly squeezed, stirred and sheared, and as a result, the material is further refined and homogenized. As the pressure gradually increases, the temperature rises accordingly. Under the conditions of high temperature, high pressure and high shear, the physical properties of the material change, from powder to paste, protein denaturation, partial degradation and refinement of the fiber. The germs are killed, health indicators are increased, and toxic components are inactivated. When the paste material is ejected from the die hole, under the strong pressure difference, the material is puffed, dehydrated and cooled. The puffed product structure is loose, porous, crisp, and has good palatability and flavor.
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