Knife coating method using ascension of the fluid by its tension
US5612092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C5/0245
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
To knife-coat elastic liquids without the presence of flow instability, the extension rate in the upstream region of the coating bead is kept low by increasing the distance over which the liquid must accelerate. The onset of the flow instability is delayed by insuring that the upstream liquid-air interface of the coating bead is relatively long and flat. This is accomplished by allowing the elastic liquid to pull itself over a relatively large distance out of a trough and into the knifing passage. The liquid is able to ascend into the knifing passage by virtue of liquid tension developed by the extensional flow in the upstream region of the coating bead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.