Method for avoiding re-circulation defects in curtain coating
US6472021B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2001 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Jan 31, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of curtain coating, the curtain being formed from at least one layer of coating solution having a composite density &rgr; (kgm−3) and a total volumetric flow rate per unit curtain width Q (m2s−1), the curtain being allowed to free fall a distance h (m), at a velocity U (ms−1), onto a continuously moving substrate having a velocity S (ms−1) with an application angle of &thgr; between the horizontal and tangent to the substrate at the point of impingement, the dynamic surface tension at the rear of the falling curtain being &sgr; (mNm−1), the aforementioned variable parameters being controlled so as to prevent recirculation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.