Extruding type fish feed pellet processing requirements
Processing requirements for different materials for extruding processing:
The various raw materials used for extruded feed are crushed as finely as possible under normal circumstances . It will be easy for feed pellet machine processing ,also good for fish eating.Strict aquaculture farmers meet their fineness requirements through ultra-fine crushing of an 80 mesh (aperture of 0.18 mm) sieve. The finer size of the raw materials, the higher the digestibility, pelleting fastness and water stability; in addition, the feed additives should be pre-mixed to make a 4% -5% mixture, and then mixed into the feed. In order to maintain a certain degree of uniformity.
Extruded material production process
Add some heat-sensitive vitamins to the puffed powder. First, add steam or water at about 100? to the powder to make the water content reach 25%, and then pass the hot powder through the drum of the fish feed extruder machine to increase the temperature. At about 140°C and 6 kg/? pressure, it is sent to the compression molding device, and then the pressure drops rapidly. The super hot water evaporates and causes the particles to expand (granulation). After the expansion, the grease is sprayed on the surface of the particles immediately to ensure The granulating surface is smooth. At this time, the pellet feed is once again sent to the dryer machine to evaporate, reducing its water content to below 10%, and finally cooled to room temperature to form an extruded pellet feed.
The mineral pre-powder can be added before the raw materials are crushed, while the vitamin pre-powder should be added when the raw materials are crushed and mixed. The purpose of this is to reduce the loss of vitamins during processing and heating. The particle size should generally be 1-2 mm, easy for fish and shrimp to eat, otherwise, it will cause waste due to poor palatability of the feed.
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