Apparatus for making bag assembly and method thereof
US8151851B2 · kind B2 · utility
7Cited by
58References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 17, 2009 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Mar 24, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7148
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of and apparatus for forming a bag assembly by RF welding. A single source of RF energy is used to generate a high frequency electric field having a first strength between tube-welding electrodes of opposing die members and a second strength less than the first strength between perimeter-welding electrodes of the opposing die members. Respective portions of the bag assembly are subjected to this variable-strength field simultaneously so that the bag assembly is formed in one welding operation. Stand-offs are used in some embodiments to limit penetration of the electrodes into the weld areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.