The working principle of a kneader
Release time:
2021-07-26
A kneader is a machine that uses a pair of rotors with specific shapes that rotate relatively to each other. Under adjustable temperature and pressure in a closed state, it intermittently plasticizes and mixes polymer materials. Below, Xiaan.com's editor will detail the working principle, structure, uses, operation methods, and precautions of the kneader.
A mill is a machine that uses a pair of rotors with specific shapes that rotate relative to each other. Under adjustable temperature and pressure in a sealed state, it intermittently plasticizes and mixes polymer materials. Below, we will detail the working principle, structure, uses, operation methods, and precautions of a mill.
During the rubber refining process in a mill, the raw rubber or other materials are added from the hopper and first fall into the upper part of the two relatively rotating rotors. Under the pressure of the upper headstock and the action of friction, they are brought into the gap between the two rotors and subjected to kneading. Then, the protrusions of the lower headstock separate the rubber into two parts, which respectively pass through the gap between the rotor surface and the front wall of the mixing chamber as the rotors rotate. After being subjected to strong mechanical shearing and kneading, they reach the upper part of the mixing chamber. Under the influence of the different speeds of the rotors, the two streams of rubber converge at different speeds in the upper part of the two rotors and re-enter the gap between the two rotors. This cycle is repeated. During the entire operation of the mill, the raw rubber is plasticized in the mill, subjected to both strong mechanical stress and thermal oxidative cracking, so the required plasticity can be obtained in a short time.
Because the shearing action on the rubber during mixing in a mill is much greater than that in an open mill, and the mixing temperature is higher, the efficiency of rubber mixing in a mill is much higher than that in an open mill.
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