Longitudinal seam sealer for continuous motion form, fill and seal machine
US5852920A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Dec 4, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/83421
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A form-fill-seal machine in which an heated longitudinal seam sealer continuously forms a longitudinal seam along lapped edges of the tube being formed. This longitudinal 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 pair of sealer bars that include shaped confronting portions. The shaped confronting portions are heated and seal the lapped edges to form a seam. After exiting the shaped confronting portions the seam is engaged by a pair of pressure rollers that force the heated edges together to insure complete closure of the seam. The lapped edges of the film pass between the shaped confronting portions of the sealer bars which confine the lapped edges to a labyrinth cross section shape. The drive for the continuous movement cross sealing jaws include a pair of gear cases on opposite of the sealing jaws, each having two sets of spaced drive shafts. The drive shafts include cranks that impart rotary motion to a pair of link bases for the front and rear sealing jaw. Pairs of para…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.