Patent · US Expired

Process and apparatus for reducing turbulence during curtain-coating

US5906865A · kind A · utility

10Cited by

7References

17Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Wolfgang Ellermeier · Darmstadt, DE
Markus Schäfer · Horterhof, DE

Key dates

Filing date	Jul 18, 1997
Grant date	May 25, 1999
Priority date	—
Expiry date	Jul 18, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S118/04
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

Non-uniform liquid flows in the curtain limit the process speed and cause defects during coating. These liquid streams are equalized by auxiliary liquids in the curtain holder. If the curtain edge is separated by a free jet of a separating liquid, turbulence in the curtain edge is isolated from the curtain center. The maximum attainable speed is increased. Because the free jet also removes liquid from the curtain in the penetration area, a beaded edge is not generated on the base, and it is possible to coat uniformly thick to the outer edge of the base. The process is especially suitable for making photographic films.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.