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Standard Operating Procedure: Comprehensive Control from Pre-treatment to Finished Product. The operating procedure for a wet pet food processing machine follows five steps: raw material pre-treatment, mixing and wetting, extrusion granulation, drying and cooling, and sieving and packaging. Step 1: Raw Material Pre-treatment. Powdered raw materials are pulverized to 80-100 mesh to remove impurities such as stones and metal. Moisture content is controlled at 10%-12% to avoid affecting the binding effect. This step is basically consistent with the raw material pre-treatment standard for extruders. Step 2: Mixing and Wetting. Raw materials are fed into a mixer, and a binder (water, starch slurry, carboxymethyl cellulose, etc.) is sprayed evenly. The binder addition is controlled at 10%-15%, and the mixing time is 5-8 minutes to ensure the raw materials reach the required level. The ideal pellet consistency—"clumpy when squeezed, easily crumbles upon touch"—is the core of wet pelleting, directly determining pellet formation. The third step is extrusion pelleting: starting the pellet mill and adjusting the roller pressure (0.8-1.2 MPa) forces the wet raw material through the die, using a 1-5mm die as needed. The fourth step is drying and cooling: the wet pellets are fed into a dryer at 60-80℃, dried to 12%-14% moisture content, and then cooled to room temperature to prevent mold growth. The fifth step is screening and packaging: qualified pellets are screened using a vibrating screen; broken pellets are returned for re-granulation, and qualified pellets are sealed and packaged.

Key control points: precise control of binder, moisture, and pressure. Binder selection must be adapted to the characteristics of the raw materials and feed requirements. For aquatic feed production, water-resistant binders such as starch paste and CMC are preferred to improve pellet water resistance; for livestock and poultry feed production, water can be used directly to reduce costs. Moisture control is crucial throughout the entire process. The moisture content of pre-treated raw materials, the amount of binder added, and the moisture content of the finished product after drying must strictly meet standards. Excessive moisture can lead to pellet clumping and mold growth, while insufficient moisture makes pelleting difficult and results in loose pellets. The pressure of the pressure rollers needs to be adjusted according to the characteristics of the raw materials. For high-fiber raw materials, the pressure should be appropriately increased to 1.0-1.2 MPa to ensure compact pelleting; for feed for young animals, the pressure should be reduced to 0.8-0.9 MPa to control pellet hardness. Compared to extruders, which require adjusting multiple parameters such as temperature, pressure, and speed, wet pellet mills offer simpler parameter control and a lower learning curve.

Common operational problems and solutions: Precise handling of high-frequency problems: Loose pellets and poor water resistance are often due to insufficient binder or excessive moisture content, requiring increasing the binder dosage and adjusting the raw material moisture content; overly hard pellets are often due to excessive pressure rollers or over-drying, requiring reducing pressure and adjusting the drying temperature and time; poor pellet uniformity is often due to uneven raw material particle size or mold wear, requiring re-crushing and screening of the raw materials and replacement of the mold. Compared to common problems with extruders such as material jamming and fluctuations in puffing degree, malfunctions in wet dog food production machines are easier to troubleshoot and have lower maintenance costs.

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