Typical Faults of dry dog food making machines - Knowledge

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The core causes and impacts of nutrient loss: Excessively high temperatures (above 160℃) and prolonged raw material residence time (above 25 seconds) in dog food manufacturing machines are the main causes of heat-sensitive nutrient loss. Vitamin C and vitamin E loss rates can reach 40%-60%, and probiotic activity is almost completely lost. Excessively high pressure (above 6MPa) exacerbates protein denaturation. While this can improve digestibility, excessive denaturation leads to amino acid loss, affecting nutritional balance. Furthermore, excessively high drying temperatures (above 100℃) and prolonged drying times after extrusion further exacerbate nutrient loss, leading to a decline in feed quality. Nutrient loss not only reduces farming efficiency but also increases feed costs, impacting farming profits.

Core measures to mitigate nutrient loss. In terms of parameter optimization, a wet-type dog food extruder machine is selected, with the temperature controlled at 80-100℃ to shorten the residence time of raw materials in the extrusion chamber (15-20 seconds), reducing the loss of heat-sensitive components. If high-temperature extrusion (130-160℃) is required, a "post-addition" process is adopted, adding heat-sensitive components such as vitamins and probiotics after extrusion and cooling, increasing the nutrient retention rate to over 85%. In the drying stage, the temperature is controlled at 80-90℃, and the drying time is shortened to 15-20 minutes to avoid double high-temperature damage to nutrients.

Auxiliary optimization of formula and process: In terms of formula adjustment, a stable compound vitamin is selected to replace single vitamins to reduce loss at high temperatures; 1%-2% oil is added to form a protective film on the pellet surface, reducing nutrient oxidation and loss. In terms of process optimization, a combination of low-temperature extrusion and low-temperature drying is used to balance buoyancy and nutrient retention. Simultaneously, the burnt material on the mini floating fish feed machine die head is cleaned regularly to prevent residual substances from contaminating the feed and indirectly affecting nutritional quality.

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