APPARATUS AND METHOD FOR MEASURING WAVINESS OF SHEET MATERIALS

A device and a method for measuring and quantifying waviness of sheet materials such as paper. The device in accordance with one embodiment comprises a base having a planar, smooth, and level upper surface for supporting a stack of sheets thereon, a plate-shaped weight for placing atop the stack of...

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Bibliographic Details
Main Authors CUMBEE, ROBERT SHEAN, CAMPBELL, EDGAR ROBERT, MOFFAT, JEFFREY THOMAS
Format Patent
LanguageEnglish
French
Published 27.06.2008
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
PHYSICS
TESTING
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Summary:A device and a method for measuring and quantifying waviness of sheet materials such as paper. The device in accordance with one embodiment comprises a base having a planar, smooth, and level upper surface for supporting a stack of sheets thereon, a plate-shaped weight for placing atop the stack of sheets, and a measuring device for measuring a vertical distance between a datum surface defined by the weight and a datum surface defined by the base. The measured distance is an indication of the height of the stack. In a preferred embodiment, the device also includes a programmed processor operable to calculate a "Wavy Ratio" based on the measured actual height H of the stack and a calculated "ideal" height of the stack, as Wavy Ratio = HI (n .cndot. t), where n is the number of sheets and t is the average caliper of the sheets.
Bibliography:Application Number: CA20072615186