Production Efficiency Differences: Capacity and Stability. Single-screw fish feed processing machines have a narrower capacity range, suitable for small to medium-scale production. Typical models have a capacity of 50-500 kg/h, and capacity is significantly affected by raw material characteristics, fluctuating by up to ±10%. Twin-screw pet feed extruder machines have a wider capacity range, suitable for large-scale industrial production. Typical models have a capacity of 200-5000 kg/h, with some reaching production lines of tens of thousands of tons. Due to their forced conveying characteristics, their capacity is highly stable, fluctuating by only ±3%. For example, a single-screw extruder with a capacity of 150 kg/h may fluctuate between 135-165 kg/h depending on the raw materials processed; while a twin-screw extruder with the same capacity maintains a stable capacity of 145-155 kg/h. For large-scale feed companies, the high capacity and stable performance of twin-screw extruders ensure continuous production and improve market supply capacity.
Pellet Quality Differences: Uniformity and Functionality Single-screw floating fish feed extruders produce pellets with large pressure and temperature fluctuations, resulting in variations in expansion degree and particle size deviation. The breakage rate is typically 5%-8%, and water resistance fluctuates between 6-10 hours, making them suitable for conventional feeds with less stringent quality requirements. Twin-screw extruders, on the other hand, produce pellets with uniform expansion degree, small particle size deviation (±0.2mm), a breakage rate controllable below 3%, and stable water resistance for 8-12 hours. Furthermore, precise control allows for the stable production of feeds with different properties, such as buoyancy and sinking characteristics. For example, in producing floating feed for sea bass, twin-screw extruder pellets achieve a buoyancy rate of over 98% and remain intact in water for 10 hours; while single-screw extruder pellets have a buoyancy rate of only around 90% and water resistance of less than 6 hours, easily leading to feed waste and water pollution.
Nutritional Retention Differences: Protection of Heat-Sensitive Components The precise temperature control (temperature fluctuation ±3℃) and uniform heating characteristics of the twin-screw pet pellet making machine better preserve heat-sensitive nutrients in the feed, such as vitamins with a retention rate of over 80% and amino acid oxidation loss of less than 5%. Single-screw extruders, due to larger temperature fluctuations (±10℃), achieve a vitamin retention rate of only about 70% and an amino acid oxidation loss rate of 8%-10%. For example, in producing high-end pet food rich in vitamins, feed produced by a twin-screw extruder is more nutritionally balanced and better meets the growth needs of young pets; while feed produced by a single-screw extruder may result in slower growth in young pets due to nutrient loss.
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