Self-standing bag
US3980225A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1975 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | Aug 4, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2170/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A self-standing bag is made of two similar side wall sheets disposed in an opposng relation and a bottom wall sheet having two edges thereof heat-fused with the lower edges of the two side wall sheets and being folded along a central folding line into the interspace between the two side wall sheets to have an inverted V-shaped cross section, each of the two lateral edges of the bottom wall sheet being recessed from the lateral edges of the side wall sheets, whereby two lateral edges of the two side wall sheets are mutually joined directly, when subjected to heat-fusing operation, to form two-ply lap joints. The invention also provides method and apparatus for automatically producing the bag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.