Procurement Cost Differences: Single-screw extruders offer better cost-effectiveness. Single-screw fish feed extruders have a simpler structure, lacking complex synchronous drive systems and auxiliary equipment, resulting in lower procurement costs. Small to medium capacity models (50-500 kg/h) cost only 50,000-200,000 RMB. Twin-screw pet food extruders have a more complex structure, requiring auxiliary equipment such as synchronous drives, forced feeding, and precise temperature control. Their procurement costs are 2-3 times higher than single-screw extruders. Small to medium capacity models (200-500 kg/h) cost 200,000-500,000 RMB, while large capacity models (above 1000 kg/h) exceed 1 million RMB. For example, a single-screw extruder with a capacity of 150 kg/h costs approximately 80,000-100,000 RMB, while a twin-screw extruder with the same capacity costs 300,000-400,000 RMB, showing a significant difference in initial investment.
Operating Cost Differences: Twin-screw extruders have higher overall energy consumption. The energy consumption of a single-screw floating fish extruder primarily comes from the drive motor, requiring no complex auxiliary equipment. The energy cost per ton of feed produced is approximately 150-200 yuan. In contrast, the energy consumption of a twin-screw extruder includes multiple components such as the drive motor, steam heating, and forced feeding. The overall energy cost is 1.5-2 times that of a single-screw extruder, reaching 300-400 yuan per ton of feed produced. Furthermore, twin-screw extruders require more skilled operators, resulting in higher labor costs (single-screw operators can be trained in 1-2 days, while twin-screw extruders require specialized technicians). For example, the operating cost for producing 1 ton of carp feed is approximately 180 yuan for a single-screw extruder and 350 yuan for a twin-screw extruder. This cost difference will continue to widen with long-term, large-scale production.
Maintenance cost difference: Single-screw extruders are more worry-free and economical. The core components of a single-screw extruder (screw and extrusion chamber) wear slowly, have a simple structure, and are easy to maintain. Annual maintenance costs are only 5%-8% of the equipment purchase cost. Core components such as the screw have a lifespan of 1500-2000 hours, resulting in low replacement costs. In contrast, the core components of a twin-screw pet feed extruder (two meshing screws and a synchronous drive system) wear quickly, have a complex maintenance process, and annual maintenance costs reach 10%-15% of the equipment purchase cost. The screw lifespan is approximately 1000-1500 hours, and replacement requires replacing both screws simultaneously, leading to higher costs. For example, a single-screw extruder with a capacity of 150kg per hour has an annual maintenance cost of approximately 4000-8000 yuan; while a twin-screw extruder with the same capacity has an annual maintenance cost of 30,000-50,000 yuan.
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