Apparatus for forming flat-bottomed plastic bags
US6056681A · kind A · utility
11Cited by
12References
12Claims
0Family size
Inventor
Key dates
| Filing date | Dec 12, 1997 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Dec 12, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S493/936
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming flat-bottomed plastic bags uses a flattened plastic tubing as a raw material. The tubing is unwound from a roll, and is passed around a gusset plate assembly, where guide members on opposite sides of the gusset plate assembly guide outside edges of the tubing inwardly between a pair of gusset plates to form gussets in the tubing. In a preferred embodiment, microperforations are formed in the bag material to provide ventilation to the finished bags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.