Method for producing a flat bottom plastic bag
US4273550A · kind A · utility
5Cited by
11References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Aug 30, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A flat-bottom bag is produced from a heat sealable tubular material having gusseted sides by clamping front and back walls in a central longitudinal region, flaring the gussets outward to about 180.degree. to provide a corner gusset tuck and refolding the gussets to their original position with the corner tucks in position between the gussets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.