Pirelli Coordinamento Pneumatici S.p.a.

Fried Krupp Ag Hoesch-krupp

Pirelli Coordinamento Phenumatici S.p.a.

Martin Jogwich

Christoph Carlhoff

Marco Nahmias

Claus-Jurgen Lorenzen

To determine the carbon black distribution two measurements of spectral intensities of separately produced plasmas are carried out with different time delays relative to a particular laser pulse, the time delay for the second measurement for determining the spectral line intensities of a reference element carbon (I.sub.C') and at least one analysis element (I.sub.A.n') being smaller than for the first measurement; for determining the spectral line intensities of the reference element (I.sub.C) and the other analysis elements (I.sub.A.n). Evaluation of the measurements is performed by reference to calibration information based on reference measurements, which information shows the magnitude of the concentration ratio of the other analysis elements or the at least one analysis element to the reference element (c.sub.A.n /c.sub.C or c.sub.A.n /c.sub.R) as a function of the appurtenant intensity ratio values. By comparison between the intensity ratio values from both measurements with the calibration information, using the concentration of total carbon (c.sub.C) and that of the selected analysis element (c.sub.A.n), the magnitude of the carbon black concentration (c.sub.R) is determined.

Process for tire manufacture with on-line determining of carbon black

To determine the carbon black distribution two measurements of spectral intensities of separately produced plasmas are carried out with different time delays relative to a particular laser pulse, the time delay for the second measurement for determining the spectral line intensities of a reference element carbon (I.sub.C,) and at least one analysis element (I.sub.A.n,) being smaller than for the first measurement; for determining the spectral line intensities of the reference element (I.sub.C) and the other analysis elements (I.sub.A.n). Evaluation of the measurements is performed by reference to calibration information based on reference measurements, which information shows the magnitude of the concentration ratio of the other analysis elements or the at least one analysis element to the reference element (c.sub.A.n /c.sub.C or c.sub.A.n /c.sub.R) as a function of the appurtenant intensity ratio values. By comparison between the intensity ratio values from both measurements with the calibration information, using the concentration of total carbon (c.sub.C) and that of the selected analysis element (c.sub.A.n), the magnitude of the carbon black concentration (c.sub.R) is determined.

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Essen, Germany

Martin Jogwich