Method for coating a liquid composition to a web using a backing roller with a relieved surface
US6177141A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1999 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Sep 15, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D3/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for coating a liquid composition from an applicator to a moving web supported by a backing roller, characterized by the steps of a) conveying the web in a partial wrap around the backing roller of diameter equal to or greater than 10 cm, the backing roller being provided with a conductive, relieved surface; b) fabricating the relieved surface with a pattern that provides venting, the pattern having a geometry and depth such that the electrostatic force at the coating point does not vary by more than a factor of about ten, the pattern covering at least 30% or more of the width of the web; c) providing an electrostatic field at the coating point; and d) coating at a web speed greater than or equal to 75 meters/minute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.