Application Of Twin-screw Extruder in Aquatic Feed

Extrusion is a processing process that ripens raw materials instantaneously under high temperature and high pressure. It integrates transportation, crushing, mixing, extrusion, shearing, high temperature disinfection and forming. It can also process viscous, high-fat and high-moisture raw materials. Therefore, it is increasingly used in the production of aquatic feed, pet feed and other food.
Aquatic feed processing process:
Ingredients → crushing → mixing → tempering → extrusion → drying → spraying → cooling → packaging
Advantages of using twin-screw extruder to produce aquatic feed:
1. Good water resistance
The aquatic feed produced by the twin-screw extruder has good stability in water through the extrusion process, so both the sinking feed and the floating feed can be soaked in water without decay, and the water quality can be maintained, thus reducing the waste of feed and providing a good living environment for aquatic animals.
2. Improve the taste of feed
The effect of temperature and pressure during the expansion process makes the feed particles have the characteristics of porosity and uniform structure, which increases the taste of the feed, thus improving the appetite of aquatic animals and increasing the consumption.
3. It is beneficial for aquatic animals to digest feed
The high temperature and high pressure in the extrusion process changes the starch and other substances, improves the digestibility of this substance, and is conducive to the better digestion of feed for aquatic animals.
4. Enriched the variety of raw materials
The twin-screw extruding machine utilizes materials that are not easy to be processed in the production process of food industry and agriculture, so as to make the best use of everything and enrich the raw material resources for feed production.
5. Improve feed safety
The use of twin-screw extrusion can effectively remove some bacteria in some raw materials, so the aquatic feed produced by its extrusion process is more safe.
To sum up, ingredients are to ensure that various raw material components accurately implement the provisions of the formula, so as to ensure the nutritional balance of the feed, and at the same time to minimize the grading after mixing. The use of a new mixer can achieve efficient mixing and ensure the quality of feed products. Steam conditioning of feed can improve the gelatinization degree of starch, denature protein and improve the digestibility of feed. In addition, conditioning is also conducive to feed granulation, expansion and maintaining pellet durability, reducing feed loss in transportation and water, and improving feed utilization. The temperature and pressure conditions of extrusion processing are stronger than that of granulation and expansion. It is the preferred processing method for aquatic feed, which can better improve the digestibility and utilization of these animal feeds.