Longitudinal profile measurement of polymer films

Film thickness fluctuation in the longitudinal direction is difficult to see. Bearing damage or concentricity inaccuracies lead to fluctuations in the longitudinal thickness.


The determination of impending bearing damage, run-out errors of individual rollers and for preventive maintenance offers potential.


Our method is a thickness measurement over the length of the film, taking into account individual roll diameters and speeds. Fourier analysis is used to determine the thickness variation.


Thickness variation = f (speed, roll diameter)


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