Factors affecting the mixing quality of the mixer

The mixing process is actually a process in which the mixing and separation of convection, diffusion, shearing, etc. coexist, and all the factors affecting the quality of these effects will affect the quality of the mixing process.

First, the impact of the model

Since convective mixing is the effect of moving the material in groups from one place to another, coarse, agglomerate mixing can be achieved quickly; and on this basis, there can be more The surface is carefully mixed with particles. Therefore, the mixing speed of the mixer mainly based on convection is inevitably faster, such as the horizontal ribbon spiral mixer. Moreover, the physical and mechanical properties of the components have a smaller effect on the mixing effect than the diffusion-based models.

The structure and manufacturing quality of the mixer have a large impact on the quality of the mixing. For example, the width of the inner and outer annulus of the horizontal mixer, if the external angle is unreasonable, will accumulate the material to one end, affecting the mixing time and mixing uniformity; the structure is unreasonable, which may cause dead spots of materials; welding of the struts, rings, shafts, etc. Poor quality, unevenness, easy to hang materials, etc.

Second, the physical characteristics of the mixed components

Mainly refers to the specific gravity of the material, the particle size, the roughness of the surface of the particles, the moisture, the scattering, the agglomeration and the components of the pellet. The smaller the difference in these physical properties, the better the mixing effect, and the easier it is to separate again after mixing. In addition, the smaller the proportion of a component in the mixture, that is, the greater the proportion of dilution, the less likely it is to mix. In order to reduce the re-separation after mixing, a viscous liquid component such as molasses may be added near completion to reduce the scatter property and thereby reduce the separation.

Third, the impact of operations

For example, in the order of feeding, the components with large proportion should be put into the machine first or most of them enter the machine, then the small amount and the small amount of components are placed on top, that is, placed in an easily dispersible place, otherwise the trace components are agglomerated. It is not easy to disperse quickly in one place, affecting further mixing.