① The raw material adaptability is wider, and it can adapt to the processing of high-viscosity, low-viscosity, high-oil content, high-moisture or viscous, oily, very wet raw materials and other raw materials that will slip in the single screw (SSE).
② There are fewer restrictions on the particle size of the raw materials, and it can adapt to the processing of raw materials from micro-powder to coarse powder particles and raw materials with particle sizes outside the specific range of single screw processing.
③ The material flow is more uniform in the barrel, and steam, water, etc. can be added to make the product achieve the desired effect.
④ The product has better internal and external quality, and can achieve a very good homogeneous state and make the material molecular structure evenly arranged, the surface is smooth during the extrusion process, and the product particles are highly uniform and uniform.
⑤ The cooking and homogenization effect is better, usually the starch cooking degree can reach more than 95%, so that the processed aquatic feed can remain stable in water and the product nutrients are not lost, and it is easy to digest and absorb.
⑥ Higher output under the same power. Good mixing performance makes the heat obtained by the material uniform in time, accelerates the degree of maturation of the material, reduces the fluctuation of material temperature, and increases the output of extruded products.
⑦ The product diversity and adaptability are wider, and it can process micro-particle aquatic feed and high-oil formula, high-moisture, high-adhesive products and multi-color, sandwich and special-shaped products.
⑧ The process operation is simpler, and the spindle speed can be adjusted according to the needs of the processed products. Due to the self-cleaning characteristics, it is very convenient to clean, and there is no need to disassemble the equipment after each processing.
⑨ The wear of wearing parts is lighter. It is usually a misconception that single screws have less wear. In fact, in the process of twin-screw extrusion, due to the stable material transportation and material flow characteristics, the wear of the material on the screw and the inner sleeve of the barrel is less than that of a single screw. Although there is one more set of screws, the cost of its accessories is still lower than that of a single screw.
⑩ Lower production cost. Since the twin-screw extruder has good operating stability, it has less startup cost, less water and gas waste, less labor cost, high heat transfer efficiency, high yield rate, high electricity output index, and low accessories cost. Its final production cost is still much lower than that of a single screw extruder.
It is precisely because of the many advantages of twin screw extruders over single screw extruders in producing aquatic feed that we advocate the priority of twin screw extruders when conditions permit.