Zippered film feed
US4840012A · kind A · utility
75Cited by
15References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Dec 10, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/723
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and mechanism for advancing a continuous length of bag making plastic film having a reclosable fastener strip extending therealong with a filling tube over which the film is formed, means for sealing the edges of the film over the filling tube, opposed pairs of advancing belts for pressing the film against the tube and driving it incrementally downwardly, means for guiding the fastener between the belts of one of the pairs and means for driving the belts incrementally to move the film downwardly as it is filled and cross-sealed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.