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Abstract
This paper is concerned with a technique for assessing different degrees of sharpness between flexible card-wire teeth. An Instron Tensile Tester was used to measure the force required to pull strips of granular-faced material over card teeth that differed in both sharpness and density, both ‘with’ and ‘against’ the wire points. Variants introduced included the load applied by the granular material to the teeth and the grit size of the granular material.
It is shown, on the basis of experiments on five different densities of card clothing, each ground to three different degrees of sharpness, that these differences can be quantitatively detected when they are measured against the wire points and that they are in complete agreement with the subjective assessments of wire sharpness.
It seems possible that the principles enunciated in this paper may be used to devise an instrument for detecting differences in wire sharpness.