G - Physics – 03 – C
Patent
G - Physics
03
C
96/111, 23/149
G03C 1/015 (2006.01) B01F 3/08 (2006.01)
Patent
CA 1115585
ABSTRACT OF THE DISCLOSURE A method for the preparation of a photosensitive silver halide emulsion wherein separate streams of circulationg peptizer solution, circulating peptizer solution, circulated with a power operated pump or pumps, are passed through separated mixing zones in which one is mixed with a solution of a silver salt and the other is mixed with a solution of a halide salt, and said streams are then combined and mixed in a reaction zone so that silver halide crystals are formed by reaction between silver salt and halide salt and the circulating peptizer solution contains increasing amounts of silver halide crystals in course of time, said circulation being continued until a silver halide emulsion of a predetermined concentration has been formed, characterised in that each of said separated streams of peptizer solutin is forced through the respective one of said se- parated mixing zones and into said reaction zone from the nozzle of a venturi-type pump and a stream of the silver salt solution and/or the halide salt solution as the case may be is caused to feed into the respective separated mixing zone under the influence of and at a flow rate dependent on the venturi suction effect of the re- spective venturi-type pump, said venturi pumps being operated under such conditions as to damp high frequency (above ? Hz) pAg oscilla- tions attributable to the inherent characteristics of the pump or pumps used for circulating the emulsion.
285249
Biermans Paul V.
Van Keilegom Roland
Verhille Karel E.
Agfa-Gevaert Naamloze Vennootschap
Borden Ladner Gervais Llp
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