Basic Raw Materials and Simple Formulas: Single-Screw Floating Fish Extruder Machines Offer Greater Adaptability. Single-screw extruders are suitable for processing basic raw materials with simple compositions, moderate moisture content (10%-14%), and good flowability, such as corn-soybean meal-based poultry and livestock feeds and conventional sinking fish feeds. These raw materials do not require complex shearing and mixing; the drag conveying and friction heating of a single screw can meet the extrusion requirements. Furthermore, the equipment has low cost, is easy to operate, and allows for controllable production inputs. For example, when producing conventional carp feed (40% corn, 30% soybean meal, 20% fishmeal, 10% wheat bran), a single-screw extruder can produce stably with acceptable pellet quality. However, when the bran content in the formula exceeds 30%, the single-screw fish feed processing machine will experience problems with poor conveying and insufficient extrusion.
Complex Formulas and Special Raw Materials: Twin-Screw Extruders Offer Significant Advantages. Twin-screw fish feed making machines, with their forced conveying and strong shearing characteristics, can adapt to complex formulas and special raw materials with high fiber, high fat, and high moisture content. When processing high-fiber raw materials (such as cattle feed with 30%-50% bran and straw content), the meshing and shearing action of the twin-screw extruder quickly breaks down the fiber structure, achieving thorough softening and extrusion. When processing high-fat raw materials (such as pet food with over 20% meat meal content), the precise temperature control of the twin-screw extruder prevents oil oxidation while ensuring uniform mixing. When processing high-moisture raw materials (wet extruded feed with 15%-25% moisture content), forced conveying prevents material adhesion and blockage. For example, in producing beef cattle fattening feed containing 40% bran, the pellet uniformity produced by the twin-screw extruder reaches over 95%, and the digestibility is improved by 20%; while the pellet breakage rate of the single-screw extruder exceeds 10%, and the digestibility is less than 60%.
Additives and functional ingredients: Twin-screw extruders offer better retention. For heat-sensitive additives such as vitamins and probiotics, as well as functional ingredients such as amino acids and fish oil, the precise temperature control and uniform mixing characteristics of the twin-screw pet feed extruder machine reduce nutrient loss and enhance feed functionality. For example, in piglet nursery feed with added probiotics, the survival rate of probiotics produced by twin-screw extruders reaches over 70%, while in single-screw extruders, due to large temperature fluctuations, the survival rate is only around 50%. In high-end pet food with added fish oil, the uniform mixing of twin screws prevents fish oil separation and ensures nutritional balance in each pellet.
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