Apparatus for sealing a lamina onto a plastic bag
US4398990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1981 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Apr 7, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1773
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Aluminum laminae are heat-sealed onto the inside of flat-bottomed plastic bags so that, by bending the lamina double after the bag has been cut open to remove part of its contents, the bag can be reclosed. The apparatus for sealing the laminae on can be incorporated in an existing bag-filling installation. An aluminum strip is supplied to a punching device from a supply roll. A punched-out aluminum lamina is placed upon the upper part of a conveyor lever. The lever is rotated through 180.degree. so that the aluminum lamina to be sealed on comes to be positioned between two layers of a web of plastic material fed by rollers. The ends of the lever are preheated by heating elements in order to accelerate the sealing-on operation. The aluminum lamina is heat-sealed onto the inside of the folded web in such a way that the longer edges of the lamina form an angle of about 45.degree. with the flat bottom of the bag. The rate of production of the existing filling installation can be maintained despite incorporation of the sealing-on apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.