EP0002020A1 - Procédé et dispositif pour maintenir la concentration d'une solution de développement, appliqués en particulier à un procédé de développement semi-humide - Google Patents

Procédé et dispositif pour maintenir la concentration d'une solution de développement, appliqués en particulier à un procédé de développement semi-humide Download PDF

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Publication number
EP0002020A1
EP0002020A1 EP78101316A EP78101316A EP0002020A1 EP 0002020 A1 EP0002020 A1 EP 0002020A1 EP 78101316 A EP78101316 A EP 78101316A EP 78101316 A EP78101316 A EP 78101316A EP 0002020 A1 EP0002020 A1 EP 0002020A1
Authority
EP
European Patent Office
Prior art keywords
developer solution
development
substance
discriminator
concentration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP78101316A
Other languages
German (de)
English (en)
Inventor
Martin Junghanns
Eckehard Stein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0002020A1 publication Critical patent/EP0002020A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/02—Details of liquid circulation
    • G03D3/06—Liquid supply; Liquid circulation outside tanks
    • G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus

Definitions

  • the invention relates to a method and a device for maintaining the concentration of at least one development-active liquid substance in a liquid developer solution, in particular for a development process of diazo sheet material which works according to the semi-wet process.
  • the developer solutions used essentially contain water, alcohol, a wetting agent and sodium hydroxide solution as active developer substances.
  • the density was measured in the simplest way with a density spindle, a part of which can pass through a light barrier.
  • the light barrier is connected to a metering valve via an electronic circuit arrangement.
  • This method for density measurement and metering works in a simple manner in such a way that when the light barrier falls below a certain density value, the actuation of a switch is triggered which controls the metering of the evaporated component of the developer solution via the metering valve.
  • This object is achieved according to the invention for a method of the type mentioned at the outset by determining the substance concentration by measuring the viscosity of the developer solution.
  • the viscosity is a good measure of the concentration of the developer solution.
  • the advantage here is that the evaporation process of the components with a relatively high vapor pressure causes a relatively large change in the viscosity of the solution, so that the changes in concentration can be detected correctly with relatively little effort.
  • This measurement method also exploits the discovery that the viscosities of the developers mentioned, which can be used to develop diazo sheet material, are not very temperature-dependent. It is therefore not necessary to compensate for the influence of temperature by special measures.
  • a device is used with the features that an electrical viscosity sensor is immersed in the developer solution and that the viscosity sensor has a discriminator is connected to a metering device of the development-active substance.
  • the measured value signals emitted by the viscosity measuring value transmitter are evaluated in the discriminator.
  • the metering device is actuated in such a way that the desired concentration of the development-active substance is restored.
  • the development-active liquid substance in the developer solutions provided here can be water, which is development-active in that at least one other component, e.g. Sodium hydroxide solution cannot act in the desired manner if this component does not dissociate sufficiently in water.
  • at least one other component e.g. Sodium hydroxide solution cannot act in the desired manner if this component does not dissociate sufficiently in water.
  • the device is advantageously characterized in that a rotary body driven by an electric motor is provided as the viscosity transducer, which is arranged in a liquid-permeable housing with a closely spaced inner wall, and in that a measuring resistor is arranged in a power supply line to the motor.
  • This device can be realized with relatively little effort and results in sufficient accuracy for metering the active liquid substance even over a long period of time.
  • the operation of the device is such that the rotating body according to the toughness of the developer solution between it and the inner wall of the housing is present, is braked.
  • the electric motor has to apply a torque dependent on the degree of braking, which in turn causes a proportional current consumption of the electric motor.
  • the voltage drop that is measured by this current in the measuring resistor can be evaluated in the signal-connected discriminator circuit for actuating the metering device.
  • the device is expediently designed with the features that the measuring resistor is connected to the discriminator via an amplifier, that the output of the discriminator is connected to a first input of an AND gate, and that a pulse generator is connected to a second input of the AND gate is and that the output of the AND gate is connected to a solenoid valve which is arranged in the outlet line of a reservoir of the development-active substance.
  • the liquid substance to be metered in is periodically fed into the developer solution through the solenoid valve, since the solenoid valve is fed in pulses by the astable multivibrator.
  • the metering rate depends. for this purpose from the output signal of the discriminator a b , in that this output signal and the signal emitted by the astable multivibrator are fed into the AND gate.
  • the discriminator only emits a signal when the amplified measurement signal indicates that the concentration of the development-active liquid substance falls below a predetermined minimum value.
  • about AND gate forwarded the pulses of the astable multivibrator to the solenoid valve, while with sufficient concentration the forwarding of the pulses of the multivibrator is interrupted by the AND gate.
  • the device is expediently further designed in that a stirrer is arranged next to a point in which a line connected to the metering device opens in a vessel receiving the developer solution into which the development-active substance is metered.
  • This measure ensures that the metered development-active substance is evenly distributed in the developer solution and that in particular the concentration at the measuring point at which the viscosity sensor is immersed in the developer solution largely corresponds to the concentration in the other volume elements of the developer.
  • the device advantageously shows the feature that the rotary body is cylindrical, which is rotatably arranged in the housing with the release of an annular gap, and that the housing has access openings from the outside into the annular gap.
  • a measuring head of the viscosity sensor is designated 1. It consists of a cylindrical rotating body 2, which is arranged concentrically in a likewise cylindrical housing 3, so that an annular gap 4 is formed between the rotating body and the housing.
  • the rotating body is mounted on a lower tip 5 in the housing.
  • An upper bearing of the rotating body is formed by an electric motor 6, which is embedded in the upper part of the housing and is attached to it.
  • the power supply lines of the electric motor are designated 7.
  • the measuring head is immersed in the developer solution 8 to be measured, whereby means (not shown) ensure that the level of the developer solution is approximately constant, at least that the surface of the developer solution lies above the rotating body.
  • the developer solution enters the annular gap 4 through openings 9 in the housing 3. The entire arrangement is housed in a container 10.
  • a measuring resistor 11 is switched on in the power supply lines 7 of the electric motor 6.
  • the electric motor lying in series with the measuring resistor is fed by a voltage source connected to the connecting terminals L2.
  • the amplifier is designed as a DC voltage measuring amplifier since there is a DC voltage at the connection terminals 12.
  • Lines lead from the output of the DC voltage measuring amplifier to a discriminator 14 which is set to a value which corresponds to the permissible limit value of the concentration, preferably in accordance with the highest permissible viscosity or density of the developer solution.
  • the output 14a of the discriminator gives one characteristic control variable for metering in the liquid substance if the measured viscosity becomes too large.
  • the output 14a of the discriminator is connected directly to a solenoid valve 16 via a line 15, while a second line 15a is interrupted by an AND gate 17 from the output of the discriminator.
  • An input of the AND gate is connected to the output 14a of the discriminator.
  • a second input of the AND gate 17 is connected to the output of an astable multivibrator 18 which emits a constant pulse train.
  • FIG. 3 shows how the solenoid valve 16 is switched on in the outlet line 19 of a storage container 20 of the liquid substance 21.
  • an agitator 23 is arranged in the vicinity of an outlet opening 22 of the line 19 and is constantly driven by a second electric motor 24.
  • the solenoid valve Since an output of the discriminator and the output of the astable multivibrator 18 represent the inputs of the AND gate 17, the solenoid valve is switched on by a certain constellation of the input signals of the AND gate (both H signals), ie when the threshold value of the discriminator is exceeded the astable multivibrator 18 pulses are actuated in pulses.
  • the pulse frequency and / or pulse length of the astable multivibrator is preferably adjustable in order to be able to adapt the metering frequency and the metering volume with which the liquid substance 21 is fed from the storage container 20 into the container 10 to the parameters of the entire device. -
  • the liquid substance 21 is metered into the container 10 through the solenoid valve until the measuring head in FIG. 1 determines that the viscosity or the density the developer solution is again in a predetermined value range. Then the solenoid valve 16 is switched off by the astable multivibrator 18 by the AND gate 17.
  • the agitator 23, which is constantly driven by the second electric motor 24, ensures that the metered substance is evenly distributed in the developer solution and thus the developer solution everywhere assumes the same viscosity.
  • liquid substances 21 can also be metered in simultaneously or in succession.
  • the proportions of the individual substances to be metered in must be determined when dimensioning the entire device, so that, depending on the viscosity, a predetermined proportion of all these substances is metered in automatically.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
EP78101316A 1977-11-12 1978-11-04 Procédé et dispositif pour maintenir la concentration d'une solution de développement, appliqués en particulier à un procédé de développement semi-humide Withdrawn EP0002020A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2750774 1977-11-12
DE19772750774 DE2750774A1 (de) 1977-11-12 1977-11-12 Verfahren zur aufrechterhaltung der konzentration in einer fluessigen entwicklerloesung, insbesondere fuer ein nach dem halbfeuchtverfahren arbeitendes entwicklungsverfahren

Publications (1)

Publication Number Publication Date
EP0002020A1 true EP0002020A1 (fr) 1979-05-30

Family

ID=6023657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78101316A Withdrawn EP0002020A1 (fr) 1977-11-12 1978-11-04 Procédé et dispositif pour maintenir la concentration d'une solution de développement, appliqués en particulier à un procédé de développement semi-humide

Country Status (3)

Country Link
EP (1) EP0002020A1 (fr)
JP (1) JPS5476231A (fr)
DE (1) DE2750774A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3690489A1 (fr) 2019-01-29 2020-08-05 Koninklijke Philips N.V. Détecteur de rayonnement de sous-pixels à double capteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB305681A (en) * 1927-08-08 1929-02-08 Marc Tanatar Improvements in and relating to apparatus for treating photographic films and the like
FR2032559A5 (fr) * 1969-04-01 1970-11-27 Cazabat Yves
DE2148909A1 (de) * 1970-09-30 1972-04-06 Xerox Corp Vorrichtung zur Bestimmung von Teilchenkonzentrationen
GB1382719A (en) * 1972-03-13 1975-02-05 Parke Davis & Co Liquid control system
FR2243457A1 (fr) * 1973-09-10 1975-04-04 Oce Van Der Grinten Nv

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB305681A (en) * 1927-08-08 1929-02-08 Marc Tanatar Improvements in and relating to apparatus for treating photographic films and the like
FR2032559A5 (fr) * 1969-04-01 1970-11-27 Cazabat Yves
DE2148909A1 (de) * 1970-09-30 1972-04-06 Xerox Corp Vorrichtung zur Bestimmung von Teilchenkonzentrationen
GB1382719A (en) * 1972-03-13 1975-02-05 Parke Davis & Co Liquid control system
FR2243457A1 (fr) * 1973-09-10 1975-04-04 Oce Van Der Grinten Nv

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3690489A1 (fr) 2019-01-29 2020-08-05 Koninklijke Philips N.V. Détecteur de rayonnement de sous-pixels à double capteur

Also Published As

Publication number Publication date
DE2750774A1 (de) 1979-05-17
JPS5476231A (en) 1979-06-18

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Inventor name: STEIN, ECKEHARD