IN-LINE ULTRASONIC CHECK FOR DETECTING THE PARTIAL VULCANIZATION OF A RUBBER MIXTURE IN THE IN SITU SILANIZATION OF BRIGHT FILLERS

摘要

The invention relates to a method for testing the silanization of bright fillers, wherein: - a mixture containing at least one silanized bright filler, preferably silanized silicic acid, and at least one rubber is exposed to ultrasonic waves in a frequency range of 4 to 10 MHz, preferably 5 to 7 MHz, and the signal intensity of the ultrasonic waves after transmission through the rubber mixture is determined; - the relative damping coefficient αrel of the rubber mixture in the frequency range of the ultrasonic waves is determined, the standard deviation σ of the relative damping coefficient α_rel is determined and αrel and σ are used to detect the partial vulcanization of the rubber mixture.