Double-bag package and perforation knife
US6935086B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2003 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Dec 2, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D75/008
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A double-bag package, and method for manufacturing same, constructed by modification to existing vertical form and fill packaging machines and perforation knives. In a preferred embodiment, the invention involves producing a double-bag package from a single sheet of packaging film by feeding a roll of film having graphics printed sideways rather than vertically into a vertical form, fill and seal packaging machine and using a novel perforating/cutting knife to alternately cut and perforate transverse seals. The perforating/cutting knife has teeth in the shape of oblique triangular pyramids, with each tooth having three cutting edges. The perforating/cutting knife produces self-correcting T-shaped perforation patterns capable of capturing and redirecting errant tears for fail-safe directional separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.