Packages made with both high-frequency/radio-frequency seals and conventional heat/pressure seals using combinations of polar and non-polar polymers
US5769772A · kind A · utility
79Cited by
41References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Aug 13, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2251/0093
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A package having multiple seals in close proximity is set forth. At least one of the seals is accomplished through the use of a polar polymer that bonds to an opposing panel in the package when exposed to an alternative electromagnetic field. The strength of the sealing can be controlled by the type and the amount of the polar polymer that is present as well as the field strength of the electromagnetic radiation, and its duration. The region to be sealed by the electromagnetic radiation can also be precisely controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.