G - Physics – 01 – N
Patent
G - Physics
01
N
73/76
G01N 19/02 (2006.01)
Patent
CA 1058419
METHOD OF AND APPARATUS FOR DETERMINING SURFACE CHARACTERISTICS, SUCH AS COEFFICIENT OF FRICTION, OF A MOVING STRIP OF MATERIAL Abstract of the Disclosure A method of and apparatus for testing a moving elongate strip of material to determine the coefficient of friction with respect to a control sample having known surface characteristics with a predetermined correlation to the surface characteristics normally encountered by the strip of material in use or processing and/or the proportion of increased tendsion caused by movement of the strip in contact with the control sample to the original tension in the strip are provided by this invention. This determination is made by moving the elongate strip of material under tension of any magnitude in sliding frictional engagement with the control sample which moves in response to unbalanced force generated by the incoming tension and the sliding frictional engagement along a predetermined path of travel, preferably arcuate, until the forces exerted on the control sample become balanced at a given position along the path of travel. The moving strip of material is guided to and from the contro sample along respective non-parallel guide paths, with the respective angles of the guide paths changing as the control sample moves along its path of travel until the angles of the respective guide paths become such, with respect to the pre- determined path of the control sample, that the forces exerted on the control sample become balanced. The coefficient of friction of the strip of material with respect to the control sample and/or the proportion of increased tension to original tension, are determined and indicated by the position of the control sample along its path of travel when the forces exerted thereon become balanced.
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