Factors affecting the mixing effect of the mixer
May 18, 2019
1. Rotor. The type and number of edges of the rotor, the number of edges and multiple shearing speed is fast, but the heat rise is high, the mixing time is shortened, and the mixing quality is affected. Influenced by the rotor type, the shear-type dispersion zone is between the rotor rib and the mixing chamber, and the force range is large and wide, the shearing force is large, the efficiency is high, and the mixing quality is good. The meshing type is that the dispersion zone is between the two rotors, the shearing force is small, the heat generation is low, and the mixing time is long and the dispersion effect is good.
2. Top plug pressure
The top plug function is to keep the rubber in the mixing chamber mixing work area.
Insufficient pressure causes the compound to slide over the walls of the chamber and the surface of the rotor.
Appropriate pressure reduces voids in the material and increases contact force
The pressure assembly increases the temperature of the rubber compound and increases the mixing power.
Insufficient filling capacity, the top plug pressure does not fully function, and the rubber compound is unevenly dispersed.
3. Temperature
Each rubber has its optimum mixing temperature range
The type and amount of raw rubber, reinforcing agent and softener determine the temperature rise of mixing
At the same temperature, the longer the mixing time, the better the dispersion.
4. Filling amount
Depending on the effective volume of the mixer itself
The type of raw rubber in the formula, the amount of reinforcing filler and plasticizer
Raw rubber plasticity should be larger
The filling factor (weight) is between 0.65 and 0.75. If the loading amount is insufficient, the necessary shearing force cannot be obtained.
5. The order of feeding, the order effect is different
I basically choose in the automatic system mixing (using multi-stage mixing, according to the rubber requirements)
6. Speed
The rotation speed is proportional to the shear rate, and the shear rate is large, and the uniform mixing speeds up.
Increasing the speed will increase the temperature of the glue, resulting in a decrease in the viscosity and shear stress of the compound.
7. Time
The length of mixing time is related to the amount of filling and the temperature rise of the formula. The mixing temperature of various rubber compounds affects the time. The speed of the mixer and the pressure of the top plug also affect the mixing time, so the mixing process is shortened as much as possible. Time and feeding time.
8. Cooling water
The temperature of the cooling water is generally set at 15 degrees. The low-viscosity rubber is not easy to be cooled by hot water, the rotor is easy to stick, and the high-viscosity rubber is cooled by hot water. Increasing the temperature of the cooling water can shorten the mixing time, reduce energy consumption, and improve production efficiency.
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