Heat-sealing wheels for forming a longitudinal weld or seal in seams of plastic films
US5935379A · kind A · utility
3Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1741
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A heat seal wheel for use with a heat sealing apparatus associated with a continuous packaging machine, for forming a longitudinal seal in a flat sheet of flexible film. The heat seal wheel is characterized by a planar heater comprising a laminar resistive heating element sandwiched in between a top layer and a bottom layer of a thermally conductive and electrically insulative material. The top layer is bonded to the bottom surface a bearing disk, in contact with and supporting a rotating heat seal wheel for conductively heating the seal wheel and producing a heat seal in the seams of a moving web of plastic film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.