Ultrasonic sealing apparatus
US4373982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Nov 24, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1013
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Plastic film in sheet form is supplied to a forming unit which forms it into tubular form with overlapping or fin-type edges. The edges are then caused to pass along an anvil and the horn of an ultrasonic sealing unit is positioned adjacent the edges for effecting ultrasonic sealing of the edges, the edges of the film passing through a gap between the horn and the anvil. An adjustable guide wheel is provided for ensuring that the edges are guided into proper relationship for ultrasonic sealing. The apparatus includes an adjustable rigid connection between the forming unit and the ultrasonic sealing apparatus for establishing a proper relationship between the forming unit and the ultrasonic unit and for providing the necessary rigidity. In order to ensure that the ultrasonic unit is effectively energized only when the film is moving therethrough, a tachometer or other speed-sensitive device responsive to movement of the sheet film is provided. A signal developed by this tachometer is transmitted to the ultrasonic sealing unit to ensure that the unit is effectively energized only when the film is moving through the sealing area and to control the level of energization of the ultrason…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.