Longitudinal seam sealer for polyethylene material
US6038839A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/71
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A form-fill-seal machine in which a heated longitudinal seam sealer continuously forms a longitudinal lap seam along lapped edges of the tube being formed. This longitudinal lap seam sealer can be used in machines having conventional cross sealing jaws as well as in machines in which the cross sealing jaws move in the direction of the moving film during the cross sealing operation. The heated longitudinal seam sealer includes a wafer thin internal hot air dispenser that discharges hot air from both surfaces on the surfaces to be fused together. The heated longitudinal seam sealer also includes an external hot air dispenser that includes a plurality of hot air discharge jets through which hot air is discharges on the outer surface of one of the overlapped edges that not only provides necessary heat to cause fusion but also exerts sufficient pressure on the overlapped edge to insure proper sealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.