Process and apparatus for reducing turbulence during curtain-coa

Details Process and apparatus for reducing turbulence during curtain-coa Process and apparatus for reducing turbulence during curtain-coa

1997-07-18

1999-05-25

Beck, Shrive

Coating processes

Falling curtain of coating material utilized

118324, 118325, 118DIG4, B05D 130, B05B 1302

Patent

active

059068655

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.

REFERENCES:
patent: 4060649 (1977-11-01), Coleman
patent: 4135477 (1979-01-01), Ridley
patent: 4479987 (1984-10-01), Koepke et al.
patent: 4559896 (1985-12-01), Bossard et al.
patent: 4830887 (1989-05-01), Reiter
patent: 4879968 (1989-11-01), Denz et al.
patent: 5328726 (1994-07-01), Reiter

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