Apparatus for sealing a hem in a moving web of film using angularly oriented hot wheels
US4717373A · kind A · utility
10Cited by
15References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Sep 8, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S493/928
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for heat sealing a hem in a moving web of plastic film using a plurality of rollers or wheels mounted on a block at spaced locations for engaging the film along the path of a heat seal to be formed in the hem. The rollers are heated by contact of one of their sides against a heated block. The small force holding the rollers against the heated block is provided by a slight angular orientation of the roller relative to the direction of film travel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.