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Temperature is a crucial factor affecting buoyancy. When producing floating pellets using a Floating Fish Feed Extruder machine, the extrusion chamber temperature must be controlled between 120-140℃. If the temperature is too low (below 120℃), the starch in the raw material will not gelatinize sufficiently, failing to form adequate binding force and porous structure, resulting in high pellet density, poor buoyancy, and even sinking. If the temperature is too high (above 140℃), the raw material will over-expand, resulting in excessively large internal pores and insufficient hardness, making the pellets prone to disintegration in water and shortening the buoyancy time. Temperature parameters need fine-tuning for different raw materials: for grain-based raw materials, the temperature should be controlled at 130-140℃ to promote starch gelatinization; for fishmeal-based raw materials, the temperature should be controlled at 120-130℃ to avoid excessive protein denaturation. During operation, the temperature should be precisely set using the temperature controller of the Floating Fish Feed Pellet Extruder machine, and feeding should only begin after the temperature has stabilized.
Pressure parameters must be matched with the temperature, typically controlled between 3-5 MPa. If the pressure is too low, the moisture in the raw material cannot evaporate sufficiently to form bubbles, resulting in fewer particle pores and poor buoyancy. If the pressure is too high, the bubbles inside the particles are excessively compressed, increasing density upon cooling and decreasing buoyancy. The pressure of the fish feed extruder can be adjusted by the die orifice diameter and the feeding speed: the smaller the die orifice diameter, the greater the discharge resistance and the higher the pressure; the faster the feeding speed, the more raw material accumulates in the extrusion chamber, and the higher the pressure. When making floating pellets, it is recommended to use a die orifice diameter of 2-4mm, and adjust the feeding speed according to the equipment capacity (5-10kg/h for small extruders, 10-30kg/h for medium-sized equipment) to ensure that the pressure is stable at 3-5MPa. For example, when making floating feed for grass carp with a small fish feed extruder, a 3mm die orifice diameter and a feeding speed of 8kg/h, with a stable pressure of around 4MPa, will provide the best buoyancy.
The screw speed should be controlled at 300-400 r/min. Excessive rotation speed results in insufficient residence time of the raw material within the extrusion chamber, leading to inadequate expansion and poor pellet buoyancy. Conversely, excessive rotation speed causes prolonged residence time, resulting in over-expansion and brittle pellets. The screw speed of the Best fish feed pellet extruder machine can be adjusted via a frequency converter system, optimized in conjunction with temperature and pressure parameters. Furthermore, the moisture content of the raw material also affects the expansion effect. When producing buoyant pellets, the moisture content needs to be controlled between 12% and 15%. Excessive moisture leads to pressure drop and insufficient expansion; insufficient moisture results in poor material flowability, high extrusion resistance, and easy pellet cracking. Real-time monitoring of the raw material moisture content using a moisture analyzer ensures parameter matching.
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1. What is the price of the small dry dog food making 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.
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