On-line web planarity measurement apparatus and method

Details On-line web planarity measurement apparatus and method On-line web planarity measurement apparatus and method

1996-04-17

1997-10-21

Dougherty, Elizabeth L.

Measuring and testing

Sheet, woven fabric or fiber

73862391, G01L 504

Patent

active

056784473

ABSTRACT:
A method and apparatus for determining the flatness of a sheet material, and for determining the lateral alignment stability of a web or sheet material. The method for determining the flatness of a sheet material includes subjecting a portion of the sheet material disposed between two rollers to a longitudinal tension insufficient to remove internal compressive strains in the longitudinal direction, sensing by non-contact means the distance from a reference plane to the sheet material, and determining a cross-sectional profile of the portion.

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