Release time:

2024-12-13

Two rotors rotate relatively, squeezing and shearing the material for efficient mixing. When the internal mixer is working, the two rotors rotate relatively, clamping and bringing the material into the roll gap, where the material is subjected to the squeezing and shearing action of the rotors. This strong force causes the material to continuously deform, achieving efficient mixing. As mentioned in "Internal Mixer (machinery used for rubber plastication and mixing) - Encyclopedia," the shearing action experienced by the material during mixing in an internal mixer is much greater than that of an open mixer, and the mixing temperature is higher, so the mixing efficiency of the internal mixer is much higher than that of the open mixer. The material undergoes complex movements in the internal mixer to achieve uniform mixing and plasticization. The material undergoes a complex movement process in the internal mixer to achieve uniform mixing and plasticization. On the one hand, the material is subjected to the squeezing, shearing, and stirring action between the elliptical rotor and the wall of the mixing chamber; the kneading and tearing action brought to the material by the relative rotation of the two rotors; the axial kneading and turning action between the rotors. As described in "Exercises and Answers of Plastic Molding Machinery (2)_word document online reading and downloading - Worry-free Document," the internal mixer uses the pressure of the upper top plug, the special shape of the rotor and the special movement changes formed by the mixing chamber wall, as well as the axial force, heating and plasticization generated by the rotor on the material, to promote the uniform mixing and plasticization of the material. On the other hand, the rubber in the internal mixer flows in different regions, realizing the exchange and mixing of the material. For example, in the transition area connecting the two halves of the mixing chamber, the rubber is squeezed by the pressure of the upper top plug on the one hand, and on the other hand, under the action of two rotors rotating at a certain speed ratio, it crosses this connecting transition area and enters behind the right (left) rotor under the action of the left (right) rotor ridge according to the different corresponding positions between the two rotors, realizing the flow and exchange of rubber in the two halves of the mixing chamber. At the same time, reasonable selection of the filling factor plays an important role in the rubber exchange of the two halves of the internal mixer.