Portable instrument for measuring the permeability of a papermaker's felt
US4401147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An instrument for measuring the air flow through a papermaker's felt at a location in registry with a vacuum box. The instrument includes a housing having a generally rectangular discharge outlet which is placed in contact with the felt in registry with the slot of a vacuum box. The housing includes an inlet chamber which houses an anemometer, and as the air is drawn into the inlet chamber by virtue of the vacuum created in the vacuum box, the air flow will rotate the anemometer vanes. A sensor produces an electrical signal in accordance with the speed of rotation of the anemometer and the signal generates, through suitable circuitry, a visual readout of the air flow. The device can be used to measure the permeability of the felt, as well as the air flow through the vacuum box.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.