Method and apparatus for forming, filling and sealing flexible plastic bags
US4598529A · kind A · utility
Inventors
Key dates
| Filing date | Jan 18, 1985 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jan 18, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B61/186
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A web of plastic bags is made from rollstock of a strong heat sealable plastic material for the bulk storage and dispensing of liquids by passing two aseptic sheets of the material into a press that heat bonds the longitudinal edges and laterally across the sheets to form a web of sealed bags. The longitudinally bonded strips are perforated to engage sprocket wheels which draw the web of bags to a position at which a dispensing fitment is bonded to the outer surface of one sheet, and then to a station which cuts a short lateral slit across only one sheet. The web then passes over and hangs from the sprocket so that the slit slightly opens to permit filling of the bag from the bottom up with a long pointed diving fill tube that isolates the bag contents from the slit. The area around the slit is then heat sealed against the opposite side of the bag to prevent leakage of the bag contents and the admission of contaminants into the bag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.