The core standards for raw material pretreatment are moisture and particle size control. Raw material moisture content is crucial for pellet formation and puffing effect, and must be strictly controlled between 12% and 14%. Excessive moisture leads to loose pellets, sticking to the machine, material jamming, insufficient pressure in the extrusion chamber of the small cat food making machine, and decreased puffing degree. Insufficient moisture causes excessive heat generation due to friction, resulting in overly hard and brittle pellets, and accelerated equipment wear. During pretreatment, moisture must be adjusted through drying or humidification, precisely controlled in conjunction with the puffing machine's steam addition system to ensure stable moisture within the extrusion chamber. Raw material particle size needs to be pulverized to 80-100 mesh. Uneven particle size leads to uneven stress on the puffing machine screw, increased wear, and loose internal structure of the pellets, resulting in poor water resistance. Small equipment can be paired with a universal pulverizer, while large production lines require grading and pulverizing equipment to ensure uniform raw material particle size and improve the processing stability of the puffing machine.
The core logic of formula matching is adapting to equipment characteristics and the nutritional needs of fish. Formula design must consider both equipment processing characteristics and fish nutrition: First, control starch content. In homemade dog food pellet machines, the starch content needs to be controlled at 30%-40%, as it's a core component ensuring good puffing. Too low a content makes it difficult to form a porous structure, while too high a content makes the pellets brittle. When producing hard pellets with flat/ring die machines, the starch content can be appropriately reduced to 25%-30% to avoid overly hard pellets. Second, adjust the amount of oil added. Oil reduces frictional heat generation from raw materials. In extruder production, the amount added should be controlled at 3%-5%. Too much oil will reduce puffing, requiring increased speed to compensate. For hard pellet production, the amount added can be increased to 5%-8% to improve palatability. Third, adapt to raw material characteristics. Extruders can efficiently process high-fiber byproducts such as brewer's grains and corn germ meal. The fiber content in the formula can be controlled at 15%-20%, while ordinary pellet machines need to control it below 10% to avoid material jamming.
Techniques for adapting raw materials to extruder operation. When using a fish feed making machine, the raw material pretreatment and formulation need to be dynamically adjusted: When processing high-fiber raw materials, appropriately increase the raw material moisture content to 13%-14%, increase the amount of steam added, and reduce the screw speed to avoid excessive pressure in the extrusion chamber; when processing high-protein raw materials (such as fishmeal content ≥30%), reduce the raw material moisture content to 12%-13%, increase the screw speed, enhance shear heat generation, and ensure sufficient protein denaturation. At the same time, it is necessary to avoid mixing impurities such as stones and metals into the raw materials, and iron and impurity removal devices should be installed to prevent wear on the extruder screw and die. For example, a fish farm, through standardized pretreatment (13% moisture, 90-mesh particle size) and optimized formulation (35% starch, 4% oil), achieved a stable 88% extrusion degree for the bass floating feed produced by the extruder, with a 15% increase in digestibility and absorption rate.
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