Method and apparatus for preventing creases in thin webs
US5979731A · kind A · utility
16Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Oct 29, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2406/423
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for removing temporary longitudinal wrinkles (29) from a thin or ultra-thin moving web (11) in a web conveyance machine by bending the web through preferably at least 90 degrees around a cylindrical small-radius air bar (13, 35, 39, 61, 63, 65, 73, 79) and for preventing permanent creases from forming in the web by disposing the air bar with the wrinkle-free web in close proximity to the surface of a contact roller (33, 53, 67, 71) and transferring the moving web across a gap (62) of preferably 1 mm or less between the air bar and the contact roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.