This article contains instructions, advice, or how-to content. The chamber is electrically heated and the temperature is kept constant within 0.5 degree C. The elasticity of the spring is chosen so that to a torque of 84 daN.cm correspond 100 viscosity units. The deformations of the shaft are transmitted to the indicating scale. The conversion of the torque into viscosity units is made by means of a calibrated flat spring anchored to the rotating disc shaft. To avoid rubber slippage during the determination, both the chamber walls and the rotor surface are striated.
Inside the test chamber a disc is rotated by means of a motor. The rubber compound is introduced under pressure into the test chamber, made up of two halves.
A number proportional with the value of this torque is taken as viscosity index (Mooney viscosity) and is reported in arbitrary Mooney units. The working principle of the Mooney viscometer consists in the measurement of the torque necessary to rotate a disc in a cylindrical chamber filled with the rubber compound to be vulcanized. Invented by Melvin Mooney, it contains a rotating spindle and heated dies, the substance encloses and overflows the spindle and the mooney viscosity is calculated from the torque on the spindle. A Mooney viscometer MV 2000 Mooney ViscometerĪ Mooney viscometer is an instrument used for measuring the Mooney viscosity of rubbers.
0 kommentar(er)
