Method used in paper making for treatment of a weave
US4391672A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Jul 2, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F7/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Ultrasonic frequency sensor/radiators (hereinafter, radiators) are arranged in the vicinity of a material to be treated, on opposite sides of such material, opposite each other. In one embodiment, longitudinal acoustic vibrations are fed to the radiators at the same frequency and the phase difference of the vibrations fed to the different radiators is varied. In another embodiment, the vibrations are fed to the radiators at different frequencies f.sub.1 and f.sub.2 and the frequency difference .DELTA.f of the frequencies, where .DELTA.f=f.sub.1 -f.sub.2, is varied. In each embodiment the most intensive area of the field of vibration combinations in the material to be treated is focused by the radiators in a manner whereby it has an effect upon a desired area of the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.