Abstract: Moisture, heat and time are three important parameters affecting quenching and tempering. Under the condition that water and heat are relatively stable, the quenching and tempering time determines the quality of quenching and tempering, and efficient quenching and tempering is the first priority to ensure high quality pellets. condition.
Key words: quenching and tempering; moisture; heat; quenching and tempering time; fullness; starch gelatinization degree
1 tempering three elements
Quenching and tempering is a hydrothermal processing process before feed granulation. It plays an important role in improving pellet quality, improving the water resistance of pellet feed, improving the nutrient digestion and absorption rate of feed, reducing molding energy consumption, and killing harmful bacteria. . Domestic and foreign studies have shown that as one of the important factors of pellet feed quality, it plays a vital role in the overall quality of pellet feed. With the improvement of the quality requirements of pellet feed in the market, all feed processing enterprises are paying more and more attention to the quenching and tempering process in feed processing. Improving or upgrading the quenching and tempering equipment is an important means for them to improve the quality of pellet feed products and improve market competitiveness. one.
The quenching and tempering is to make the raw starch in the raw material mature under the condition that the feed is steamed and kept for a certain period of time, that is, hydrothermal. Moisture, heat and time are three important parameters required for starch to change from raw starch to gelatinized starch. Steam is added during the quenching and tempering process to increase the moisture and temperature of the feed, and the quenching and tempering is carried out for a certain period of time, thereby satisfying the necessary conditions for starch gelatinization. After sufficient quenching and tempering, the gelatinization degree of starch in the product is greatly increased. The hydrothermal action during the quenching and tempering process also causes the proteins in the raw materials to be thermally denatured. Denatured proteins are easily digested, resulting in greatly improved protein digestibility of the feed.
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