EP0565581B1 - Dispositif pour alimenter sous pression un poste de couchage photographique - Google Patents

Dispositif pour alimenter sous pression un poste de couchage photographique Download PDF

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Publication number
EP0565581B1
EP0565581B1 EP92902361A EP92902361A EP0565581B1 EP 0565581 B1 EP0565581 B1 EP 0565581B1 EP 92902361 A EP92902361 A EP 92902361A EP 92902361 A EP92902361 A EP 92902361A EP 0565581 B1 EP0565581 B1 EP 0565581B1
Authority
EP
European Patent Office
Prior art keywords
emulsion
container
volume
pressure
photographic
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.)
Expired - Lifetime
Application number
EP92902361A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0565581A1 (fr
Inventor
Jean-Claude Bosvot
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.)
Kodak Pathe SA
Eastman Kodak Co
Original Assignee
Kodak Pathe SA
Eastman Kodak Co
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 Kodak Pathe SA, Eastman Kodak Co filed Critical Kodak Pathe SA
Publication of EP0565581A1 publication Critical patent/EP0565581A1/fr
Application granted granted Critical
Publication of EP0565581B1 publication Critical patent/EP0565581B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
    • B05C11/101—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material responsive to weight of a container for liquid or other fluent material; responsive to level of liquid or other fluent material in a container

Definitions

  • the invention relates to a device for supplying pressure under pressure to a photosensitive composition desaturated in gas and more particularly relates to the supply of photographic emulsion to a coating device.
  • the emulsion in the field of photographic emulsions, the emulsion, once remelted, is supplied to the coating device by gravity. According to such a technique, the emulsion basin is placed above the coating device. For certain products, it is sometimes necessary to have flow rates of up to 10 l / min. If we consider downpipes with a diameter between 15 and 20 mm, this implies that the emulsion basin is placed at least 15 or 20 m above the coating device. This is of course strongly penalizing from the point of view of congestion.
  • a device for supplying a coating station with photographic emulsion comprising a first tank disposed at the outlet of said suitable arrangement and intended to receive a given volume of photographic emulsion, said first tank being connected to an air tank whose pressure is kept constant by appropriate means, the volume of said air tank being very greater than the volume of the first reservoir so as to substantially absorb the relative variations in pressure linked to variations in the volume of emulsion in the first reservoir.
  • Fig. 1 to which reference is now made represents a device as described in patent application FR 89/17515 filed on December 26, 1989 in the name of the applicant and making it possible to supply the supply device according to the present invention with an emulsion under pressure and desaturated in gas.
  • the device mainly comprises a feed hopper 1, a deaeration device 4, conveyor devices 2 and 3 for transporting the mixture and a remelting device 5.
  • the feed hopper (1) is fed with a mixture of various constituents of an aqueous composition, in the form of solid pieces.
  • this mixture consists of a photographic composition with silver halides, suitable for being applied to a support to form a layer.
  • the process for obtaining these solid pieces consists, as described in patent application FR-A-2 626 088, of separately preparing the various constituents of the layer to be obtained, comprising at least one emulsion with silver halides, and solutions or dispersions containing one or more of the finishing additives and / or gelatin, to cool these constituents, to solidify them each in the solid state, to cut them into pieces, to mix in the cold, solid state, the constituents chosen according to the formulation of the desired layer.
  • the feed hopper is provided at its base with a device with rotating blades (8) to prevent the formation of a bridge at the outlet of said hopper.
  • the first device (2) transports the mixture from the feed hopper (1) to the deaeration device (4) which will be discussed in more detail later.
  • the second ensures the transport of the mixture from the deaeration device (4) to a device for recasting the mixture (5) which will also be discussed in detail later.
  • these conveying devices consist of a conventional Archimedes screw.
  • These two Archimedes screws (2), (3) are rotated by the respective motors (6) and (7) and terminate respectively by a sealed device (13) which can be, for example a pump of the MOINEAU type , thus allowing the emulsion to be put at the desired pressure.
  • a deaeration device consisting of a vacuum enclosure (4) is placed between the two conveying devices and upstream of the mixture redesign device (5).
  • a pressure close to the water vapor pressure corresponding to the temperature of the mixture is applied to the mixture, said enclosure comprising an inlet orifice through which the solid mixture coming from the feed hopper and driven by said first conveying device (2) is introduced into said vacuum enclosure (4) and an outlet orifice through which the solid mixture is discharged from said enclosure and is driven by means of said second conveying device (3) mixture redesign device (5).
  • the absolute pressure inside the depression chamber is between 1000 and 2000 Pa and preferably is between 1000 and 1500 Pa.
  • the vacuum chamber (4) is put in depression by means of a pump (9) connected to the enclosure by a tube (10).
  • the enclosure (4) is provided with a stirring device (11) with rotary blades.
  • the conveying device (3) and the stirring device (11) are rotatably mounted by means of bearings (not shown) allowing the enclosure (4) to be placed under vacuum.
  • the role of this vacuum enclosure (4) is to minimize the amount of interstitial air (that is to say, between the pieces forming the mixture) and to decrease the amount of air dissolved in the composition it -even.
  • the device for recasting the mixture (5) is located downstream of the vacuum enclosure and comprises a heat exchanger supplied, for example, by a circulation (14) of a thermal liquid.
  • the emulsion is remelted at around 40 ° C and exits through the pipe (15).
  • the heat exchanger is of the multitubular type. Its exchange surface is 3.2 m2.
  • the heating fluid is water, the temperature of which is adjusted according to the flow of composition at remelt, but preferably below 60 ° C to ensure more regular reheating.
  • the motor driving the conveying device (3) in rotation is controlled by the flow rate of the molten mixture leaving through the pipe (15).
  • the motor driving the conveying device (2) in rotation can be controlled by the volume contained in the vacuum enclosure (4) by means of a probe (16). It is also possible to use an alarm device (17) indicating an insufficient filling level of the feed hopper (1).
  • This device generally called a continuous liquefaction device, constitutes only one example of a device that can be used for implementing the present invention. It is of course obvious that any other device known from the prior art and which makes it possible to supply a desaturated gas emulsion under pressure can be used.
  • FIG. 2 represents an exemplary embodiment of the supply device according to the present invention.
  • This supply device is, in the example shown in FIG. 2, placed at the outlet of a liquefaction device as described with reference to FIG. 1, only the heat exchanger 100 being shown.
  • the heat exchanger 100 is surmounted by a small tank 101 whose maximum capacity is, for example, 5 liters.
  • This small tank is connected to an air tank 102 whose pressure is kept constant by a holder-regulator 103, and whose volume is much greater than the emulsion tank 101.
  • the The ratio of the volumes of the two tanks must be as large as possible in order to best absorb the relative pressure variations linked to the variations in emulsion level.
  • the volume of the air tank 102 is approximately at least 10 times greater than that of the emulsion tank 101.
  • the pressure inside the air tank varies between 105 and 2, 105 Pa.
  • the emulsion supplying the emulsion tank 101 must be under a pressure at least greater than the pressure of the air tank, suitable means being provided for regulating the flow of emulsion between the exchanger and the emulsion tank.
  • the remelted emulsion is maintained at a constant level by means of the probe 104 which acts on the remelting system.
  • the usefulness of the air tank 102 is twofold. It allows the pressurization of the emulsion and, therefore, its distribution towards a use located at any altitude. In addition, it substantially absorbs the relative pressure variations linked to the emulsion volume variations, in application of Mariotte's law (the volume of the air tank 102 is very large with respect to the volume variations emulsion).
  • the pressurized emulsion is distributed by the piping 105 to a gear pump 106 whose speed is controlled by the flow meter 107.
  • This constant emulsion flow flows to the coating device 109 in particular through a filter 117 and , according to a particular embodiment by the ECR 108 (ultrasonic deaerator) whose function is to redissolve the few bubbles that can be generated during the filling phases or during the recasting.
  • bubble detectors 111, 112 allowing the quality of deaeration to be controlled, at the outlet of the redesign for the first, and at the entrance to the sleeping device 109 for the second.
  • the air tank 102 When the supply device is initialized, the air tank 102 is isolated from the emulsion tank 101 by the valve 113 and from the piping 105 by the valve 116.
  • the heat exchanger 100 is in the atmosphere . In order to prevent the first solid pieces entering the exchanger 100, immediately recharging with interstitial air, which would generate a large amount of bubbles or foam when they are redesigned, which we know would be very difficult to get rid of.
  • the following start-up sequence is used: via the valve 114, a quantity of boiled osmosis water is introduced which is just necessary to fill the lower part of the exchanger 100; the pumps of the recasting device are started up so that the first solid pieces entering the exchanger are immersed in water, therefore without contact with air; the water is pushed up to the tank 101 which has been previously purged.
  • the purge tube contains an emulsion detector 115 which, when all the water has been evacuated, causes the purge to close; the reservoir then fills up to a predetermined level where the valve 113 is open, causing the pressurization of the emulsion and allowing the subsequent filling of the pipe 105 by opening the valve 116, the pipe 105 having been previously filled with water to prevent the appearance of bubbles.
  • the filter 117 is replaced by two filters 118, 119 arranged in parallel, between the heat exchanger 100 and the emulsion tank 101, each of the two filters being associated with a valve 120, 121.
  • valves 120 and 121 allow to pass alternately on one or the other of the filters, thus authorizing the change of one of the filters during that the other is in service, the reservoir 101 absorbing the level and pressure variations linked to these permutations.
  • the filters 118, 119 are arranged between the remelting device and the tank 101.
  • One of the advantages of the present invention resides in the fact that, the pressure of the emulsion varying very slightly, it is possible to directly supply the gear pump of the coating station without a regulating device.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Coating Apparatus (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP92902361A 1990-12-06 1991-12-02 Dispositif pour alimenter sous pression un poste de couchage photographique Expired - Lifetime EP0565581B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9015530 1990-12-06
FR9015530A FR2670304B1 (fr) 1990-12-06 1990-12-06 Dispositif pour alimenter sous pression un poste de couchage photographique.
PCT/FR1991/000955 WO1992010786A1 (fr) 1990-12-06 1991-12-02 Dispositif pour alimenter sous pression un poste de couchage photographique

Publications (2)

Publication Number Publication Date
EP0565581A1 EP0565581A1 (fr) 1993-10-20
EP0565581B1 true EP0565581B1 (fr) 1994-08-10

Family

ID=9403140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92902361A Expired - Lifetime EP0565581B1 (fr) 1990-12-06 1991-12-02 Dispositif pour alimenter sous pression un poste de couchage photographique

Country Status (6)

Country Link
EP (1) EP0565581B1 (ja)
JP (1) JPH06503512A (ja)
AU (1) AU646531B2 (ja)
DE (1) DE69103433T2 (ja)
FR (1) FR2670304B1 (ja)
WO (1) WO1992010786A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2723005B1 (fr) * 1994-08-01 1996-09-13 Kodak Pathe Dispositif de distribution de liquide par gravite et dispositif d'enduction photographique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658682A (en) * 1968-07-01 1972-04-25 Gen Electric Electrolyte supply system
BE756027A (nl) * 1969-09-13 1971-03-11 Agfa Gevaert Nv Inrichting voor het transporteren en ontgassen van viskeuze vloeistoffen
JPS61124363A (ja) * 1984-11-19 1986-06-12 Hirohito Sato 熱水循環レトルト装置

Also Published As

Publication number Publication date
DE69103433D1 (de) 1994-09-15
DE69103433T2 (de) 1995-03-30
FR2670304A1 (fr) 1992-06-12
AU646531B2 (en) 1994-02-24
WO1992010786A1 (fr) 1992-06-25
FR2670304B1 (fr) 1993-02-12
AU9118491A (en) 1992-07-08
JPH06503512A (ja) 1994-04-21
EP0565581A1 (fr) 1993-10-20

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