The angle of repose refers to the maximum angle measured by the gravity and the friction between the particles in the gravitational field when the particles slide on the free slope of the powder accumulation layer and are in a static state. There are two methods for determining the angle of repose: the injection method and the discharge method. Injection method: The powder is slowly added from above the funnel, and the material leaking from the bottom of the funnel forms a tilt angle of the conical stack on the horizontal surface. Discharge method: The powder is added to the cylindrical container to keep the bottom surface of the cylinder horizontal, and the inclination angle of the reverse conical residual powder deposit formed in the cylinder when the powder flows out from the center hole of the cylinder bottom. These two inclination angles are angles of repose, and sometimes the inclination method is used; in the cylindrical container which rotates slowly around the horizontal axis, powder of 1/2 to 1/3 of its volume is added, when the surface of the powder is produced When sliding, the inclination angle of the surface is measured. The angle of repose can be directly measured by a protractor, or can be calculated from the height of the powder layer and the radius of the disc, that is, tan θ = height / radius.
Angle of repose
The fluidity of the powder cannot be expressed by a single characteristic value, and is usually expressed by an angle of repose. Usually refers to the maximum angle formed by the free slope of the powder accumulation layer and the horizontal plane. The smaller the angle of repose, the smaller the friction and the better the fluidity. It is generally considered that the fluidity is good when θ ≤ 30 degrees, and the fluidity requirement in the production process can be satisfied when θ ≤ 40 degrees. The fluidity of the powder has a great influence on the weight difference and normal operation of granules, capsules, tablets and the like.
Angle of repose concept
Angle of repose
The angle of repose refers to the angle between the free surface and the horizontal plane when the free surface of the powder deposit is in a balanced limit state in the gravitational field. There are two methods for determining the angle of repose: the injection method and the discharge method. Injection method: The powder is slowly added from above the funnel, and the material leaking from the bottom of the funnel forms a tilt angle of the conical stack on the horizontal surface. Discharge method: The powder is added to the cylindrical container to keep the bottom surface of the cylinder horizontal, and the inclination angle of the reverse conical residual powder deposit formed in the cylinder when the powder flows out from the center hole of the simple bottom. These two inclination angles are the angle of repose, and sometimes the inclination method is used; in the cylindrical container which rotates slowly around the horizontal axis, powder of 1/2 to 1/3 of its volume is added, when the surface of the powder is produced When sliding, the inclination angle of the surface is measured.
test methods
Injection method
The particulate material falls from the funnel and falls on the plane to form a cone, and the cone bottom angle is the angle of repose.
Discharge method
The bulk material is discharged from the bottom of the container, and the angle between the inclined surface of the material and the bottom surface is the angle of repose after the material stops flowing.
Tilt method
The rectangular container containing 1/3 of the loose material is inclined or the cylindrical container is fluctuated. The angle formed by the surface of the material after rest is the angle of repose, and the angle of repose is determined by the injection method. The device is given a bottom diameter D, respectively. When H is measured, the angle of repose a=arctg(2H/D).
Influencing factor
shape
The closer the particle is to a sphere, the smaller the angle of repose.
size
For the same material, the smaller the particle size, the larger the angle of repose. This is due to the greater mutual adhesion between the finer particles.
Moisture content
It is related to the increase in water content and the like. This is because each particle is surrounded by a moist surface layer, which causes it to increase in adhesion and force between particles.
Stacking condition
If the material is vibrated, the angle of repose is reduced.
For the meat marinating solution we refer to meat tenderizer, Saline mixer, Saline injector(brine injection systems), vacuum massage tumbler.
Saline injector can evenly inject the brine and salt auxiliary materials into the meat blocks, which can shorten the pickling time and greatly enhance the taste and yield of the meat products. The machine can be adjusted with stepping rate, stepping distance, injecting interval and injection pressure according to the technological requirements. Then the brine and salt auxiliary materials can be injected into the meat evenly and continually to reach the optimal effects.
While vacuum tumbler makes meat rolled in the drum under vacuum condition, similar to pulmonary respiration (make product to inflation and shrink alternatively). It makes meat salted evenly, increases the adhesive quality and taste and ensures the freshness of meat.
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