JPS55147625A - Developing method of two component system diazo photosensitive paper - Google Patents

Abstract

PURPOSE: To obviate the production of water drops in a developing chamber and the leakage of smell to the outside by operating the heater in a developing solution evaporating vessel in correspondence to the liquid temperature in the vessel and presetting the time from starting of evaporation until operating a developing solution feed pump.

CONSTITUTION: Before a heater 2 is operated, the liquid temperature in a developing solution evaporating vessel 1 is detected 8. According to the liquid temperature, the T(T<t₂-t₁) smaller than the difference between the time t₁ required for the developing solution to evaporate after the operation of the heater 2 and the time t₂ when developing gas (containing NH₃ and steam) is obtainable at the outlet of a heat exchanger (condenser) 4 is beforehand set. After the set time T (10W200 sec.) upon reaching the temperature at which the developing solution in the vessel 1 evaporates, a pump 7 is operated to feed the developing solution from a tank 6 to the vessel 1 through the condenser 4 and rectifying tower 3. The outlet temperatures of the towers 3 and condenser 4 are detected by temp. detecting elements 9, 10 and the developing gas is sent into a developing chamber 5. Since in this way, the gas enters the chamber 5 at the temp. not exceeding the temp. in the chamber 5, the production of water drops in the chamber 5, the penetration of NH₃ into the water drops and its leakage to the outside may be prevented and the development of good density may be obtained.

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