Laboratory banbury mixer is generally composed of mixing chamber, two rotating rotors, top bolt, bottom bolt, temperature measuring system, heating and cooling system, exhaust system, safety device, discharge device and recording device. The surface of the rotor has spiral protruding edges, the number of protruding edges are two, four, six, etc. The cross-sectional geometry of the rotor is triangular, cylindrical or elliptical. There are tangential and meshing types.
The working principle of the laboratory banbury mixer is that when the mixer works, the two rotors rotate relative to each other. The material from the feeding port is clamped into the roll gap and is squeezed and sheared by the rotor. After passing through the roll gap, the lower top bolt tip edge is divided into two parts, which are separately along the gap between the front and rear chamber wall and the rotor and then back to the top of the roll gap. The material is subjected to shearing and friction all over the rotor during the flow cycle, so that the rubber and the mixture surface are fully in contact. The mixture block is broken by shearing along with the rubber through the clearance between the rotor and the rotor, the clearance between the rotor and the upper and lower top bolts, and the inner wall of the mixing chamber. It is surrounded by the tensile deformation rubber and stabilized in the broken state. At the same time, the convex ribs on the rotor of the mixer make the rubber move along the axial direction of the rotor, and play the role of stirring and mixing, so that the mixture is evenly mixed in the rubber.
