content
Core Parameter Control: Coordinated Matching of Speed, Temperature, and Pressure. The screw speed of a single-screw pet food extrusion machine is a core control parameter, directly determining the material residence time and the amount of frictional heat generated. Higher speeds (200-400 rpm) result in shorter material residence time, more frictional heat, and higher extrusion intensity. When producing fish fry feed, the speed should be reduced (200-250 rpm) to avoid over-expansion and excessively hard pellets. When producing adult fish feed, the speed can be increased (300-350 rpm) to enhance the extrusion effect. Extrusion temperature needs to be adjusted according to the raw material formula. For formulas with high starch content, control the temperature at 120-140℃; for formulas with high protein content, control the temperature at 100-120℃. Excessive temperature can cause the raw material to scorch, while insufficient temperature will result in incomplete melting. The normal range for extrusion pressure is 3-6 MPa. If the pressure is insufficient, reduce the die orifice diameter or increase the speed; if the pressure is too high, reduce the speed or increase the feed rate.
Operating Techniques: Raw Material Pretreatment and Maintenance of the Single-Screw Fish Feed Making Machine. Raw material pretreatment must meet two core requirements: moisture content must be controlled between 10% and 14%; excessive moisture can cause the screw to stick, while insufficient moisture will result in inadequate extrusion. Particle size must be ground to 80-120 mesh; uneven particle size will lead to pressure fluctuations and affect extrusion uniformity. For example, in fish feed production, corn and soybean meal need to be ground to 100 mesh, and the moisture content of the raw materials should be tested with a moisture meter to ensure it meets the requirements. During equipment operation, uniform feeding must be maintained, which can be assisted by a vibrating feeding device. Pressure and temperature should be monitored in real time; if fluctuations exceed ±0.5MPa or ±10℃, parameters must be adjusted promptly. After shutdown, residual raw materials in the screw, extrusion chamber, and die must be cleaned promptly to prevent drying and blockage. Screw wear should be checked regularly; wear-resistant bushings should be replaced every 1000 hours of operation, and the screw should be replaced every 2000 hours.
Common Problem Solutions: Targeted optimization and adjustments. If insufficient particle expansion occurs, the screw speed can be increased, the extrusion temperature can be raised, or the die orifice diameter can be reduced. If the particle breakage rate is too high, the speed can be reduced, the temperature can be lowered, or the die orifice diameter can be increased. If the raw material is not conveyed smoothly, the moisture content and particle size of the raw material need to be checked, or residual impurities in the screw groove need to be cleaned. If the single screw fish feed extruder machine makes abnormal noises, it needs to be stopped immediately to check the wear of the screw and extrusion chamber to avoid damage to the parts. For example, if the water resistance of the particles is found to be insufficient (less than 6 hours) during production, the screw speed can be increased to 350 r/min to increase the extrusion pressure, making the particle structure more compact and improving the water resistance to 8-12 hours.
Related equipment
about Us
Customer visit
Certificate of Honor
FAQ
1. What is the price of the Twin screw fish feed extruder machine?
The price ranges from approximately $1,500-$55,000
2. Do you provide maintenance services for your customers?
Yes, we offer comprehensive after-sales maintenance services to our customers.
If you would like to learn more about MIKIM machinery, please contact us. We offer one-stop service and welcome your inquiries!!!