Partially zippered pouch and machine for making same
US5941643A · kind A · utility
60Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Apr 7, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S383/906
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A standard vertical form, fill and seal machine is provided with a change part that allows the marginal edges of the film to be formed into a lap or fold over seam at a location offset from the center of the flat front surface of a D-shape forming tube. The film is formed into a loop at the central portion of the rear generally cylindrical section of the forming tube and an interlocked zipper strip is fed into this loop and bonded to the inner surface of the loop. The cross seam for the bag is formed in the fore and aft direction so that it will be in the plane of the interlocked zipper strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.