Sensor, system and method for determining Z-directional properties of a sheet
US5297062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1993 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Apr 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0282
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor, system and method for determining the various Z-directional properties of a sheet by measuring the caliper of a moving sheet of material at a plurality of pressures. The invention employs a caliper gauge and a set of pressure transducers that can measure and send signals indicative of the caliper as well as pressures exerted on the sheet. The signals are then digitized by an analog-to-digital converter and sent to a computer. The computer uses the compressibility data to construct a compression stress-strain diagram where the slope of the curve in the linear region of the curve is defined as the compression modulus of elasticity which can be empirically correlated to the tensile modulus of elasticity for various grades of paper. The tensile modulus of elasticity can be then used in various formulas to determine other Z-directional physical properties of the sheet, such as tensile strength, extensional stiffness and Scott bonding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.