Sealing system
US5156712A · kind A · utility
3Cited by
13References
1Claims
0Family size
Inventor
Key dates
| Filing date | Feb 22, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Feb 22, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/71
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film sealing system and method which utilizes the combined application of pressure and high voltage static charge to achieve a high quality seal between two plastic layers of packaging material. Pressure is applied via a sealing bar 40 to evacuate air from between two film layers to be sealed together. A static charge is then applied via a static probe 30. Relatively high pressure air is admitted to a passage which surrounds the static probe. Such air induction of the static charge has been found to intensify the static charge penetration of the film layers and to consequently produce a higher quality film seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.