Coating by means of a coating hopper with coating slots where th

Details Coating by means of a coating hopper with coating slots where th Coating by means of a coating hopper with coating slots where th

1991-03-28

1992-09-01

Beck, Shrive

Coating processes

Falling curtain of coating material utilized

118410, 118411, 118DIG2, 118DIG4, B05D 130

Patent

active

051437589

ABSTRACT:
In the hopper coating of liquid compositions on moving webs, as in the coating of photographic layers on film supports, the trapping of solid particles or bubbles in the hopper slots causes line defects or streaks in the coated layers. These defects are avoided or reduced by determining the conditions under which the composition can be flowed through one or through a plurality of adjacent slots of the coating hopper at slot Reynolds numbers less than about 10 and flowing the composition through such slot or slots under said conditions.

REFERENCES:
patent: 3508947 (1970-04-01), Hughes
patent: 3920862 (1975-11-01), Damschroder et al.
patent: 3928392 (1985-06-01), Ishizaki et al.
patent: 3973062 (1976-08-01), Fahrni
patent: 4143190 (1979-03-01), Choinski
patent: 4222343 (1980-09-01), Zimmermann et al.
patent: 4384015 (1983-05-01), Koepke et al.
patent: 4572849 (1986-02-01), Koepke et al.

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