What is the control of product size by ultra-fine jet mill?

The ultra-fine jet mill is the shearing of the material by the high-pressure airflow, the impact between the particles of the material itself and the impact and friction of the materials and other parts of the equipment to crush the material. The ultra-fine jet mill can be operated under aseptic conditions. The pulverized material has fine average particle size, narrow particle size distribution, smooth surface shape of the particles, high purity, high activity, good dispersibility, etc., and does not generate heat during pulverization, and is suitable for pulverizing low melting point and heat sensitive substances. Ultra-fine jet mill is very suitable for ultra-fine preparation of drugs. According to statistics, about 25% of ultra-fine jet mills in the world are used in the pharmaceutical industry.

The control of the particle size of the ultrafine jet mill depends mainly on the particle size of the raw material, the crushing pressure, the feed pressure and the feed rate. The logical relationship between the ultrafine jet mill and these parameters is specifically: the smaller the particle size of the raw material, the higher the pulverization efficiency, and the larger the particle size of the raw material, the lower the pulverization effect. When the pulverizing pressure and the feed pressure are constant, the product will be finer when the feeding speed is reduced, and the product will become thicker when the feeding speed is increased. When the feed rate is constant, the particle size of the product will be finer, the crushing pressure will be reduced, and the product will become thicker. Therefore, the particle size control is achieved by adjusting the parameters of the ultrafine jet mill during the pulverization process to achieve different pulverization fineness. Before pulverization, it is necessary to determine the relationship between the feed rate and the pressure and then determine the appropriate pulverization parameters to achieve the customer's Particle size requirements. The particle size of the product needs to be checked by the particle size detector to check the fineness and distribution range. In addition, if the measurement is more accurate with the electron microscope, it is also possible to compare the detection results with the internationally famous particle size detector.

Ultra-fine airflow pulverizer is a relatively precise machine. Some details need to be paid attention to by the operator during daily use and maintenance. In order to improve the pulverization efficiency of the ultra-fine airflow pulverizer, it is necessary to check whether the raw materials meet the requirements before production. It is strictly forbidden to mix foreign materials in the raw materials. During production, a certain amount of material must be maintained in the grinding chamber of the ultrafine jet mill. In the case where the flow rate of the pulverizing gas is constant, there are many materials in the grinding chamber, and the current of the classifier is large; the material in the grinding chamber is small, and the current of the classifier is small. Also, the feed rate must be kept even and stable, not too fast or too slow. The feeding speed is too fast and the device will be overloaded.

Also regularly maintain the equipment, often check whether the supply pressure reaches the pressure required for pulverization, and the graded motor of the ultra-fine airflow pulverizer. After the equipment is operated for 3,000 hours, or after long-term shutdown and long-term storage, before re-use, please timely The material adhered to the nozzle of the ultrafine jet mill and the inner wall of the grinding chamber and the material adhered to the classification portion is cleaned to prevent the pulverization effect of the ultrafine jet mill from being affected.

All of the above points have been noticed to ensure that the ultra-fine jet mill has been working for you with high crushing efficiency!