Methods and apparatus for measuring web thickness and other characteristics of a moving web
US5479720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21G9/0009
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A caliper measuring system is provided for determining the thickness of a moving sheet. The system comprises first and second caliper sensing heads having first and second sensing shoes positioned on opposite sides of the moving sheet for engaging the sheet. A gap sensor is associated with the first and second sensing shoes for generating distance signals representative of the distance between the first and second sensing shoes and for determining the thickness of the moving sheet based upon the distance signals. The gap sensor includes a processor which determines the thickness of the moving sheet from the distance signals, generates a count of lumps sensed in the moving web, and generates a baring profile representative of rapid thickness variations along the moving sheet in the direction of movement of the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.