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ON THE FACTORS OF DEVELOPMENT IN A ROLLER TYPE AUTOMATIC PROCESSOR

1968; Japan Radiological Society; Volume: 24; Issue: 4 Linguagem: Inglês

10.6009/jjrt.kj00001367539

1881-4883

Kiyoshi Yamamoto, Yasuhiro Shimada,

Industrial Vision Systems and Defect Detection

Development of films in a roller type automatic processor depends chiefly upon the temperature of developer, pressure of a roller, site of vomitory of a circulating pump, fatigue of fllter, and flow rate of replenisher. So these factors were studied by examining density curve of films using an aluminium step penetrameter. 1) Similar density curves were obtained by CDM-101R developer at the temperature of 26.5℃ for 1.5 minute in a roller type and by CDRX developer at 20℃ for 2 min. 40 sec. in a hanger type processor. Nevertheless, higher shadow density and lower γ, that is flatter tone of film, were often revealed in the former. 2) Coincidence of density curves was observed in the following two cases, a roller was operated for 90 seconds in developer of an automatic processor, and ordinary 140 seconds development in a tank processor. This shows the fact that pressure for a roller promote development equally. 3) Agitation power was decidedly diminished by a solution roller rack, but, development of the part of film around vomitory was apparently increased, so "toe" or "shoulder" in density ourve were noted. 4) A developmental filter revealed about 1 gr adherence after dealing 300 sheets of film in the size of 10×12 inches. Namely, no remarkable changes occur in density curve of films after development of 12,000 sheets of the same film. 5) Flow rate of replenisher must be smaller in the case of relative more percentage of films sized under 10×12 inches. 6) Avoidance from higher shadow density and flattening of film which in apt to be taken place in high temperature developing could be obtained by suitable combination of developer and film.