On-line web planarity measurement apparatus and method
US5678447A · kind A · utility
9Cited by
27References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1996 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Apr 17, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92666
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.