Extrusion technology first appeared in the 1930s, which was used in the production of cereal convenience food. By the 1950s, the technology was being used to make pet feed; Development to the 1980s, extrusion technology began to be used in the production process of catfish feed, catfish feed machine quickly in the world has been widely used in many countries.
Catfish feed machinery is mainly the use of extrusion expansion technology, extrusion expansion technology is mainly used in two ways: one is the gas flow expansion process; The other is an extruded expansion process. Specifically, the main application principle of the gas expansion process is to heat the system through external conditions, or to provide hot water steam, so that there is a lot of heat energy in the system and it is in a high temperature state; The extrusion extrusion process is the need to rely on the spiral rod equipment, constantly forward extrusion, forming a certain driving force and friction force, so that the material changes, now compressed or formed gelatinized state due to high temperature. At this time, a large amount of heat energy will gather in the material, and the moisture in it will also show the state of high temperature. Once the pressure in the material becomes normal, the high-energy material system will be chaotic, and the state of expansion will appear.
Changes of nutrient composition in feed produced by catfish feed machinery:
(1) the change of starch: in the process of extrusion and puffing, the starch in the catfish feed will gelatinize under the environment of high temperature, and the gelatinization situation is mainly affected by the starch content and water content. Under the action of extrusion, the temperature of the material increases, and with the continuous increase of the temperature of the material, the permeability of water is also strengthened; When the water penetration reaches a certain proportion, the water in the material will be absorbed, making the starch in the material rupture, and finally form a gelatinized state. Under normal circumstances, when starch encounters high temperature in sealed environment, the macromolecular polymer in starch will break and present a state of melting, which reduces the total content of starch and increases the content of dextrin and reducing sugar.
(2) protein changes in catfish feed, protein is also an important part of the total feed formula is relatively large. Its main purpose is to ensure that aquatic feed can meet the nutritional needs of aquatic animals, to ensure their growth state. The function of protein is closely related to the stability of catfish feed. Its viscosity, elasticity and water absorption all affect the stability of feed to a certain extent.
(3) the change of crude fiber: the crude fiber in the food is instantly cut and reorganized in the catfish feed machine barrel, and the high temperature curing, the physical change makes the raw material nutrition in the fish feed fully retained and sterilized, and the mortality rate is safely reduced.
Catfish feed machinerypurchase needs to be based on the actual needs of customers, Ji 'nan FLD Machinery Co., Ltd. can provide you with professional product suggestions and purchase configuration. Contact: Kevin, Tel :86-18660429170. Our company will wholeheartedly provide you with better prices and more reasonable product solutions.
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