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Food, feed premixes and some chemical additives generally have higher requirements in this respect. Taking feed premix as an example, the mixing equipment must meet the national standard requirements to achieve a mixing uniformity coefficient of variation CV ≤ 5%, natural residual amount ≤ 0.8%, no obvious leakage phenomenon, some enterprises have higher standards, which are available The commonly used powder mixing equipments selected include a twin-shaft paddle-free gravity mixer, a double-helical conical mixer, a mixing device for rotating the container and the rotor at the same time, and some special-shaped mixing equipment such as high-speed pulverization and airflow agitation can also be used under certain conditions. Meet these requirements.
In addition, some powder mixing equipment can't reach a certain index under normal circumstances, but it is often improved effectively when some special structures are adopted. For example, the coulter mixer will reduce the mixing uniformity coefficient of variation CV from 8% to 5% or even 3% after using the three-dimensional coulter blade plus flying knife structure;
For example, most of the horizontal mixing equipment can greatly reduce the natural residual amount of materials after adopting the 90° full-opening and blowing self-cleaning system, and can adopt the inclined-type discharge gate structure and the shaft end gas-tight structure. Basically eliminate the leakage of the mixer.
The precision of the powder mixing equipment is the basic element to ensure the quality of the powder product, and its connotation generally includes mixing uniformity, natural residual amount, and sealing performance.