Abstract: According to many experimental studies, it is found that under low temperature conditions, the length ratio of conditioning temperature and die hole diameter has a very important influence on the processing quality of pellet feed. In order to improve the quality of pellet feed processing and reduce the waste of resources in the production of pellet feed, this article mainly analyzes and explores the influence of modulation temperature and aspect ratio on the quality of pellet feed processing, and provides a series of measures.
 
1 Influence of conditioning temperature and die hole length-diameter ratio on the processing quality of pellet feed
 
With the advent of the era of antibiotic-free, heat-sensitive substances such as probiotics are gradually added to the pellet feed, which leads to a very important effect of temperature on the quality of the pellet feed during the feed production process. In the process of producing pellet feed, if the temperature is too high, it will kill heat-sensitive substances such as probiotics. If the temperature is too low, the bacterial substances in the pellet feed will be sterilized incompletely, resulting in the production of pellet feed. Substandard quality. Therefore, in order to avoid the influence of temperature on the test, this test is to study the effect of conditioning temperature and die hole aspect ratio on the processing quality of pellet feed under low temperature conditions, so as to study the raw materials after maturing and make pellet feed pellets under corresponding conditions. Whether it is full and whether it meets the standards for particle quality inspection. The main purpose of this experiment is to provide some theoretical guidance for the production of livestock pellet feed. The following two tables show the effects of different conditioning temperatures on the gelatinization degree and reducing sugar content of feed starch (Tables 1 and 2).
 
2 Raw materials and production methods of pellet feed
 
2.1 Formulation of experimental diets and pellet raw materials
 
The main components of pellet feed include: corn, fish meal, salt, methionine, threonine, etc. Among them, the corn needs to be crushed into fine particles of 11.0mm, and then the raw materials are proportioned according to the nutritional requirements, then matured, cooled and then added with heat-sensitive substances such as probiotics, and finally tempered into granules. The temperature of the conditioned feed pellets is generally 60, 50, 40, 30 °C, the length and diameter of the die holes are generally 7:1, 6:2, 10:1, and 300 mg/kg of probiotics is added on the basis of the test material. , and also need to adjust the temperature of pellet feed to protect the activity of probiotics. In addition, some vitamins should be added to each kilogram of pelleted feed to ensure that the nutritional elements of the pelleted feed can meet the national feed requirements.
 
2.2 Sampling and collecting samples
 
In order to ensure that the pellet feed produced is qualified, after the pellet feed is produced, it is necessary to randomly select the pellet feed for quality inspection.
 
2.3 Standards and methods of quality inspection
 
2.3.1 Starch gelatinization degree When testing the starch gelatinization degree of pellet feed samples, the staff can use amylase to test. Add amylase to starch, and calculate the chemical reaction between amylase and starch. Finally, add iodine solution, and judge the gelatinization degree of starch by observing the color of the chemical reaction result.
 
2.3.2 Hardness of feed pellets In order to test the quality of pelleted feed, it is also necessary to test its hardness. The hardness standard of pelleted feed should refer to the relevant information.
 
2.3.3 Tolerance index of pelleted feed Put the pelleted feed into the revolving box, rotate at 50r/min for 20min, take out the pelleted feed after stopping, and then weigh the remaining mass of the pelleted feed.
 
3 Test results
 
3.1 Effects of feed quality, temperature and hole diameter ratio on the quality and hardness of pelleted feed
 
This experiment mainly studies the change law of pellet feed quality under low temperature conditions. The main raw materials are corn, soybean meal, etc. After being processed and matured, it is then made into pellets under low temperature conditions. It is found that the quality of pellet feed is not only affected by the ratio of raw materials, but also by the diameter of the die hole of the processing machine. When the temperature of producing pellet feed is higher, and the ratio of the diameter to the length of the membrane hole of the machine is larger, the hardness of the pellet feed produced will be higher, but it will affect the activity of probiotics in the feed, and the electricity consumed by the production of pellet feed will also increase. The test results show that in order to make the pellet feed quality meet the standard, it needs to be produced under this kind of production conditions.
 
3.2 Effects of conditioning temperature and die hole diameter on starch gelatinization degree in pellet feed
 
After a series of experimental studies, it was found that the mechanical conditioning temperature and the diameter of the die hole have a very important influence on the starch gelatinization degree of the pellet feed. Under the same temperature conditions, the smaller the diameter of the die hole, the higher the influence on the gelatinization degree of starch in the pellet feed.
 
3.3 Effects of tempering temperature and die hole diameter-length ratio on retention of probiotics in granules
 
After a series of experiments, it was found that the activity of probiotics is greatly affected by temperature. If the temperature is too high during the production of pellet feed, it will directly reduce the activity of probiotics. Therefore, in order to ensure the retention of probiotics in the production process of pellet feed and the quality inspection standard of pellet feed, it is necessary to produce pellet feed under low temperature conditions.
 
 
4 Conclusion
 
Through this test, it can be found that the quality, hardness and quantity of probiotics of the pellet feed are not only affected by the production temperature, but also by the diameter of the die hole. Through a series of studies, it has been found that under low temperature conditions, the production of pellet feed with the matured raw materials is beneficial to improve the quality and hardness of pellet feed; under the same temperature conditions, the higher the die hole diameter ratio, the better the production of pellets. The higher the energy consumption during feeding. Through the experiment, it was found that the optimal plan for producing pellet feed, that is, when the temperature is 65°C, using the equipment with the die hole diameter ratio of 6:1, the pellet feed quality produced is the highest.