Measuring and testing – Surface and cutting edge testing – Roughness
Patent
1994-12-09
1997-03-25
Williams, Hezron E.
Measuring and testing
Surface and cutting edge testing
Roughness
364562, G01B 528
Patent
active
056146620
ABSTRACT:
Subjective paper characteristics such as visual appearance and print quality are often objectively related to certain scales of surface roughness. Three dimensional topographic surface data is obtained from a paper sample secured by vacuum to a flat, porous plate for translational movement in a grid pattern beneath a vertically compliant stylus that is resiliently suspended beneath a rigid, overhead support beam. Such surface data is mathematically filtered by a linear convolution technique or the distinctly alternative circular convolution technique to segregate the raw data characteristics of component surfaces that contain only certain frequencies of roughness. The root-mean-square variations of such component surfaces is then used to objectively characterize respective surface characteristics.
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Hallan Matthew J.
Paradis Stephen J.
Rogowski Donald F.
Shephard Michael L.
Larkin Daniel S.
McDaniel J. R.
Schmalz R. L.
Westvaco Corporation
Williams Hezron E.
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