Liquid passage system for photographic coating devices

Details Liquid passage system for photographic coating devices Liquid passage system for photographic coating devices

1993-11-15

1995-04-11

Drodge, Joseph W.

Coating apparatus

Projection or spray type

Flexible web or strand work

118412, 118419, 118DIG4, B05C 500

Patent

active

054054427

ABSTRACT:
The present invention relates to a coating hopper for applying one or more layers of photographic liquid onto a web of paper or film support. The device incorporates a liquid passage system with a metering slot of defined width which leads to an expansion section having an increasing width as liquid moves away from the metering slot. The expansion section is connected to a discharge slot having a defined width greater than that of the metering slot which delivers photographic liquid to a location on the coating device where a layer of that liquid is formed.

REFERENCES:
patent: 2761417 (1956-09-01), Russell et al.
patent: 3005440 (1961-10-01), Padday
patent: 3474758 (1969-10-01), Russell
patent: 3749053 (1973-07-01), Timson
patent: 4041897 (1977-08-01), Ade
patent: 4283443 (1981-08-01), Choinski
patent: 4287240 (1981-08-01), O'Connor
patent: 4292349 (1981-09-01), Ishiwata et al.
patent: 5143758 (1992-09-01), Devine
Y. Harazaki, "Progress of Coating Technique", Extension Technology Service Center, Inc., p. 359 (1988), month unknown.

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