| Patent Number |
Title Of Patent |
Date Issued |
| 7553269 |
Method of manufacturing a bag |
June 30, 2009 |
| A bag having an inwardly disposed seam is manufactured from a sheet of plastic bag material having two major surfaces and two parallel side edges. A first seam seals the two parallel side edges together at the same major surface with the side edges disposed inwardly of the tube to fo |
| 6890290 |
Method and apparatus for producing valve bags |
May 10, 2005 |
| The present invention relates to a method and apparatus for folding and sealing a web of material to form an item with a contoured seal such as a valve bag. Folding apparatus form the web of film into a continuous tubular web having upper and lower sections, a closed side and an open |
| 6254521 |
Apparatus for manufacture of a plastic bag with standup bottom wall |
July 3, 2001 |
| A flat plastic bag is formed from a side gusseted tubular web. The bag is formed with an open end and a opposite spaced end seal. Hinge crease patterns are formed in each of the gusseted portions at the bottom end of the bag. The pattern includes a two ridge upper leg and a three ridge |
