Influence of powder fluidity on mixing
Powder fluidity is a double-edged sword
In principle, the better powder fluidity, the higher the efficiency of powder mixing, but in the actual operation should pay attention to the following points:
1) the fluidity of the powder on the mixing effect:
Positive effect: high mixing efficiency. According to the theory of liquefaction mixing model, the faster the powder flow rate is, the more the powders are mixed with each other and the higher the permeation efficiency is, and therefore the easier the mixing is achieved.
Negative impact: According to the theory of liquefaction mixing model, powder in the mixing process due to the powder flow is better, will strengthen due to differences in the characteristics of the powder produced a new floating or sinking phenomenon; and after mixing, the powder in the Loading and unloading, transportation vibration prone to secondary segregation, stratification, resulting in new uneven.
2) poor mobility of the powder on the impact of mixing:
Positive impact: strong holding power of powder, once all kinds of powder diffusion uniformity (that is, mixed), it is not easy to produce new segregation, delamination and new uneven phenomenon.
Negative impact: According to the theory of liquefaction mixing model, powder in the mixing process due to poor powder flow, powder flow slow mixing will make it difficult to reduce the mixing efficiency, not easy to achieve the purpose of mixing.
3) In practical work, the liquidity is too good or too poor. The mixing of powders is actually a mixing process. (The relationship between mixing and flowability is shown in the figure below.) A powerful mixing equipment is needed to solve the problem.
4) The fluidity of powder is determined by the fluidity of the main powder with a large content of ingredients.