Sheet tension sensor
US5029469A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1988 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Sep 21, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sheet tension measuring device is disclosed for measuring the tension of a moving sheet wherein a moving sheet is accurately positioned with pinchers at 2 spaced locations. The sheet is deflected between these pinchers from its nominal straight line path, and the amount of deflection and deflecting force are measured. The pinchers iron out any wrinkles in the sheet as the moving sheet slides through the pinchers. Sheet tension is computed based upon the measured deflection force and deflection distance. The resulting measurements of local sheet tension are used to correct nondestructive sheet strength measurements. A device and method are also disclosed for nondestructively determining the sheet strength and the extensional stiffness of the sheet in the machine direction and in the cross-direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.