Device and method for the production of tubes or sections of tubes
US8790231B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2011 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Feb 22, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A device for the production of tubes or sections of tubes having at least one paper layer, from which paper bags can be manufactured, includes an unwinder device for unrolling at least one material web from a material web roll, a device for the provision of at least one edge region of each material web with glue, and a tube forming device via which the edge region provided with glue can be inverted onto, and attached to, a second edge region. The tubes or sections of tube can be provided with air-permeable channels in the device. The device for providing at least one edge area of each material web with glue has glue application valves, with at least two glue application valves being functionally assigned to each material web, and with noncontinuous glue tracks being produced with the glue application valves such that interruptions therein form the air-permeable channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.