Turning bar for contactless guidance of a tubular film
US7025303B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2004 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Jun 16, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2406/1131
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A turning bar for contactless guidance of a tubular film web moved at a loop angle around the turning bar, including a support tube with a hollow interior, which can be connected with a compressed air source. The support tube has a plurality of air outlet openings which communicate with the interior and are spaced apart from each other, substantially over an entire width of the support tube within an angular area of the support tube corresponding to the loop angle of the tubular film web. An air-permeable microporous layer is applied to the exterior of the support tube and forms the surface of the latter, through which the compressed air exiting the air outlet openings of the support tube can flow. The compressed air exits the microporous layer as a laminar air flow, which forms a laminar air cushion between the turning bar and the tubular film web. An angular area in which the air outlet openings are formed in the support tube is increased with respect to the loop angle of the tubular film web. This invention also is for a method for contactless guidance of a tubular film web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.