Side sealing mechanism for a packaging machine
US4380446A · kind A · utility
36Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1980 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Sep 12, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Heat sealing bars are spaced circumferentially around a rotatable drum and seal together two face-to-face strips of material as the strips are drawn continuously around the drum. The sealing bars are automatically moved radially inwardly and outwardly to change the circumferential distance between the bars and the effective diameter of the drum and thereby keep the bars in register with printed material on the strips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.