Bags made from thermoplastic synthetic resin sheeting having cutoff weld seams and process for producing the bags
US4931034A · kind A · utility
21Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1988 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Aug 5, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of bags from thermoplastic synthetic resin sheeting with a bottom seam and/or a lateral seam fashioned as a cutoff weld seam obtained by severing tubular film sheets in the bottom zone, wherein there is produced by heat contact welding, at a station upstream of a transverse seam cutoff welding of the bottom seam or lateral seam, a wide flush weld seam over the entire width of the tubular film sheet and/or of the bag bottom to be produced, and subsequently the transverse cutoff weld seam is formed over the flush weld seam, extending within the flush weld seam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.