Biomass pellet mills often produce pellets with poor water resistance and high feed powder content. Solutions include:
1. Improving gelatinization: Increase steam volume or conditioning temperature. If necessary, add 1–2% α-amylase to promote starch gelatinization.
2. Selecting an appropriate compression ratio: Adjust according to the type of raw material. For livestock and poultry feed, a ring die compression ratio of 12:1–15:1 is recommended; for aquatic feed, a higher ratio (15:1–20:1) is needed to improve water resistance.
3. Enhancing cooling and screening: After cooling, control the pellet moisture content to 10–12%. Use a double-layer vibrating screen for grading to remove fine powder and substandard pellets.
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