Method for forming heat seals
US4463542A · kind A · utility
7Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1982 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Mar 10, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1054
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a bagging machine for producing industrial bags, an improvement comprising a sealing head compartmented on the back side, and included is a plate valve to block at least certain of the compartments during the initial part of the sealing cycle. During the sealing cycle, a heated air stream exiting from the sealing head is controllably channeled to occur at defined regions, e.g., opposite the bag gussets and lap seam, and then by opening the valve, the channeling is terminated and heat is applied uniformly to complete the bag end sealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.