EP0000175B1 - Entwicklungseinrichtung zur Entwicklung von Diazokopiermaterial nach dem Halbfeuchtverfahren - Google Patents

Entwicklungseinrichtung zur Entwicklung von Diazokopiermaterial nach dem Halbfeuchtverfahren Download PDF

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Publication number
EP0000175B1
EP0000175B1 EP78100208A EP78100208A EP0000175B1 EP 0000175 B1 EP0000175 B1 EP 0000175B1 EP 78100208 A EP78100208 A EP 78100208A EP 78100208 A EP78100208 A EP 78100208A EP 0000175 B1 EP0000175 B1 EP 0000175B1
Authority
EP
European Patent Office
Prior art keywords
roll
roller
press roll
press
applicator roll
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
Application number
EP78100208A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000175A1 (de
Inventor
Horst Dipl.-Ing. Witte
Arthur Broze
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 EP0000175A1 publication Critical patent/EP0000175A1/de
Application granted granted Critical
Publication of EP0000175B1 publication Critical patent/EP0000175B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D5/00—Liquid processing apparatus in which no immersion is effected; Washing apparatus in which no immersion is effected
    • G03D5/06—Applicator pads, rollers or strips
    • G03D5/067—Rollers

Definitions

  • the invention relates to a developing device for developing diazo copying material by the semi-wet process with an arrangement of rollers which are pressed against one another with their circumferences, a passage gap being formed between two rollers, one of which is a press roller with a grooved hard surface, for the diazo copying material to be developed , as well as with a metering element for the indirect or direct application and distribution of developer liquid to the other of the two rollers lying against the passage nip, which forms an application roller to which the metering element is adjacent.
  • Such a developing device is known from CH-PS 480669, which has an application roller with a resiliently elastic surface and a rigid second roller which is in contact with the application roller and has a grooved surface pattern.
  • the application roller is assigned a metering device which determines the thickness of the solution layer on the elastic application roller and thus the specification of the amount of developer solution which is applied to the copy paper passed between the rollers.
  • a developing device is known from DE-OS 2209865, which has three rotatable rollers arranged in a row parallel to one another. Adjacent rollers lie against each other. The roller located at one end of the row is rotatably supported in bearings which are fixed immovably in a certain position. The other two rollers can be moved in the direction of the rollers adjacent to them or away from them.
  • a device is provided for exerting a pressure on that roller which is located at the other end of the row of the roller arrangement with respect to the roller which is mounted so that it can rotate in a stationary manner.
  • An application wick made of felt is used to apply and distribute the developer liquid to the middle roller, which is immersed in a trough with the developer liquid and pressed against the middle roller, for example a rubber roller, by a spring.
  • the roller which is rotatably mounted at one end of the row of rollers, is a counter-pressure roller.
  • the third roller On the opposite side of the rubber roller is the third roller, which is a squeeze roller and which, like the rubber roller, is displaceable in the direction of the counter-pressure roller.
  • a pressure roller which rests on the outside of the series on the squeeze roller and presses it together with the rubber roller onto the counter-pressure roller.
  • the pressure emanating from the pressure roller has an even effect over their lengths even when the squeeze roller, the rubber roller and the counter-pressure roller bend, provided that these rollers have sufficient strength. Even if an unevenly distributed pressure is exerted on the squeeze roller by the pressure roller, the squeeze roller, rubber roller and counter-pressure roller uniformly apply the developer liquid to the circumference of the rubber roller because the developer liquid accumulates meniscus-like at the contact line between the rubber roller and the squeeze roller. There is a uniform pressure distribution along the contact line between the rubber roller and the counter-pressure roller when the pressure is transferred via the squeeze roller and the rubber roller. A leaf spring presses the felt wick strip against the rubber roller under even pressure over its entire length.
  • FR-PS 2193218 relates to a developing device for diazo copying material with a feed roller partially immersed in the developer liquid bath, an application roller which is in contact with the feed roller, and a pressure roller which forms a passage nip with the application roller for the diazo copy material to be developed.
  • a metering and stripping element is in each case on the feed roller and the application roller in order to limit the thickness of the developer liquid layer to be applied.
  • the metering element can be a lamella or a squeeze roller, the latter either being arranged in series with the other rollers or lying laterally on the application roller.
  • This developing device is very complex since either four rollers are used or at least three rollers and two metering lamellae, which results in considerable difficulties in dimensioning such a developing device.
  • the printing lamellae tend to disrupt the synchronous running of the diazo copying material through the developing device, which can lead to the diazo copying material emerging from the developing device in a crumpled manner because the passage speed through the developing device no longer corresponds to the speed of transport of the diazo copying material through the remaining stations of the device.
  • US Pat. No. 3,626,833 also includes a two-roller arrangement with a lower roller, which is partially immersed in a bath of developer liquid for taking up this liquid, with an application roller lying thereon, against which a metering lamella is pressed, and which only serves to transfer the developer liquid taken up by the lower roller and metered by the lamella onto the diazo copy material to be developed.
  • This diazo copying material runs between the upper roller, which is provided with a rubber coating for the adhesion of the developer liquid, and a pressure lamella which presses on the application roller from above.
  • the pressure lamella With a suitable dimensioning of the printing lamella it can be achieved that the pressure is approximately the same across the width of the printing lamella and the application roller, but the pressure lamella tends to disrupt the synchronous running of the diazo copying material through the developing device, so that the throughput speed of the diazo copying material through the developing device no longer matches the constant speed at which the diazo copy material is to be transported through the entire copier.
  • the otherwise known press roll is used, so that a replacement of the pressure lamella by a press roll would lead to a relatively complex three-roll system which would be difficult to dimension for the requirements in semi-moisture development.
  • the present semi-moist process is intended in particular for the development of two-component diazo material with an alkaline liquid which contains a proportion of an aliphatic amine.
  • one-component diazotype material can also be developed in this way that only contains rapidly coupling diazonium compounds.
  • a solution of an azo coupling component in a pre-metered amount of about 1.5 to 4.5 cm 3 / m 2 is to be supplied to the diazo layer (DE-OS 2325579).
  • the solution of the azo coupling component can have a pH of around 14.
  • the present invention is based on a developing device of the type mentioned, the task of creating a developing device for diazo copying material up to DIN A 0 and larger while avoiding the disadvantages of the devices discussed above, which enables the developer liquid evenly and in with little effort minimal amount to be applied to the diazo copy material to be developed.
  • This developing device has the advantage that a very thin and uniform layer can be applied to the diazo copy material to be developed with a two-roll mill comprising an applicator roll and a press roll between which large width diazo copy material can be transported.
  • a third roll can be omitted in order to equalize the pressure along the contact line or across the width of the rolls.
  • the essence of the present invention is therefore that for the development of diazo copy material by the semi-wet process, a two-roller system consisting of an application roller for dosing and simultaneous application of preferably aqueous developing liquid to the diazo copy material and a press roller for generating the required pressure along the contact line of the two rollers on the Developer liquid is applied, as well as a single press roller, which rests on the press roll - or several press rolls acting in the middle in an equivalent manner - in connection with such dimensioning of the equatorial moments of inertia J 2 of the press roll and J 3 of the application roll, that the deflections of these rolls are the same are and there is even pressure along their contact zone.
  • the moments of inertia are related the equatorial moment of inertia J 2 of the press roll is measured according to this relationship after the equatorial moment of inertia J 3 of the application roll is determined.
  • the area moment of inertia J 3 is determined in accordance with the outer diameter - in the case of a hollow roller also the inner diameter - of the application roller, these diameters being determined by calculation or experiment according to the desired pressure between the press roller and the application roller and the deformation permitted in the process.
  • the desired pressure in the contact line requires, in addition to the weight of the press roll, a certain feed force exerted by the press roll on the press roll, which enters into the relationship given above for the area moment of inertia J 2 .
  • the sum of the press in the direction of the connecting line of the axes components of the Z partial forces of the metering element which are preferably in the form of a lamella, for metering the developer liquid on the application roller.
  • the feed force of this slat is adjusted according to the amount of developer liquid to be applied.
  • the latter are preferably dimensioned such that there are no or the same size and rectified deflections for the press and application roller.
  • the press roll deflection can be influenced by the direction of action of the feed force of the press roll; the application roller deflection by the point of attack and the direction of action of the metering force and the frictional force.
  • the last-mentioned influencing variables on the application roller deflection are also of importance for the developer dosage. They are to be determined experimentally.
  • the inclination of the main plane is also determined by the specification that the copy material coating should be at the bottom and the desired direction of travel of the copy material.
  • the development device has the features that the application roll is provided with a liquid-adsorbing elastic coating and that the press roll has a grooved hard surface.
  • the amount of liquid to be applied to the diazo copying material is measured in accordance with the delivery pressure of the lamella provided for dosing and the surface roughness or the properties of the elastic covering. This amount is practically completely transferred to the diazo copying material by the back pressure of the hard press roll without the formation of a meniscus-like liquid jam in the contact line.
  • the lamella is preferably dimensioned such that the deflection at the contact line of the lamella on the application roller is equal to the deflection of the application roller at this point.
  • This dimensioning can be achieved particularly expediently in such a way that a lamella carrier carrying the lamella is provided with a tensioning rail with which a uniform contact pressure along the contact line of the lamella running in the axial direction can be adjusted on the application roller.
  • the bracing rail is fastened at two ends opposite in the direction of the contact line and can be adjusted in the middle between the two ends by a screw in its distance from the plate carrier.
  • the development device is preferably configured by such an arrangement of the directions of attack of the feed force of the press roller on the application roller and the feed force of the lamella that the deflections of the press roller and the application roller parallel to the plane of the passage gap and perpendicular to the direction of the main plane in which the axes of the Press roll are almost zero.
  • a variant of this development device is expediently dimensioned such that the deflection of the press roll and the deflection of the application roll are aligned and of the same size parallel to the plane of the pass nip.
  • a plurality of pressure or pressure rollers can be provided in the central region of the pressure roller, which rollers exert approximately a point load on the pressure roller. In this case, the pressure between the individual press roll and the press roll is reduced, but the specified dimensioning of the area moment of inertia of the press roll still applies with good approximation in order to achieve constant deflections and pressures along the contact line on the application roll.
  • Fig. 1 denotes a press roll, which, as shown in Fig. 2, rests centrally on a press roll 2.
  • the roller arrangement is completed by an application roller 3, against which a metering lamella 4 presses.
  • a torque M do is exerted on the press roller 1, which is rotatably mounted about the bearing 6 via a rocker 5, which, together with the weight of the press roller, determines the feed force P 1 at the contact point 7 between the press roller and the press roller.
  • the steel press roll 2 has a grooved surface. It is guided in the guide elements 8, 9 in the common main plane, in which the axes of the press roll 2 and the application roll 3 lie. The vector of the weight of the press roll is indicated by the arrow G 2 . The press roll is supported along the contact line 10 on the application roll.
  • the application roller is constructed as a hollow roller with a roller core 11 made of steel and a liquid-absorbing coating 12, for example made of rubber.
  • the application roller is rotatably mounted in the fixed bearings 13, 14, in such a way that the coating is immersed in a developer liquid 16 contained in a container 15.
  • the developer quantity taken up in the container 15 by the application roller driven in the direction of rotation of the arrow 17 is metered by the metering lamella 4, which extends over the contact line 20 of the application roller.
  • the lamella consists of plastic or steel coated with plastic and is fastened along its length to a lamella carrier 18 by means of a terminal strip (not shown).
  • the lamella can be pivoted together with the lamella carrier around two fixedly arranged bearings, of which the bearing 19 is shown schematically in FIG. With the total force P 4, the lamella presses obliquely from below against the application roller along the contact line 20. In FIG. 1, three dash-dotted lines can also be seen, which indicate surfaces perpendicular to the plane of the drawing.
  • a line represents the main plane 21 in which the axes 22 and 23 of the press roll and the application roll lie.
  • the main plane 21 includes the angle of inclination a 2 to the vertical plane 24.
  • the axis 22 of the press roller and the axis 26 of the press roller lie in the plane 25 indicated by a line.
  • the angle between the direction of the feed force P i and the main plane is designated U1 .
  • the angle between the weight vector G 3 and the main plane is designated a 3 .
  • FIG. 1 also shows the transport plane 27, which is oriented at right angles to the plane 21 in the passage nip 20a of the press roll and the application roll.
  • the narrowest point of the passage gap is the contact line 10.
  • x and y coordinate directions in the transport plane and in the main plane are shown in Fig. 1 and finally the angle ß 4 of the slat contact point to the main plane and the angle a 4 of the feed force to the normal through the contact point of the slat.
  • a preferred roller arrangement according to FIG. 1 has the following data, the equatorial moments of inertia being matched to one another in accordance with the specified dimensioning rule:
  • the press roll is matched to the application roll, taking into account the specified data, so that its deflection becomes the same as the deflection of the application roll:
  • the embodiment according to FIG. 3 differs from that according to FIGS. 1 and 2 essentially in that the metering lamella 4 presses on the application roller from above in order to exert a force component in the y direction on the application roller, which corresponds to the corresponding one Force component in Fig. 1 is directed opposite.
  • the axes 22, 23, 26 of the rollers and the press roller lie in the main plane.
  • FIG. 3 and more precisely FIG. 4 show a lamella carrier 28 which is provided with a stiffening strip 4a and a bracing rail 29.
  • the bracing rail is firmly screwed to the plate carrier at both outer ends, while the center of the plate carrier exerts an additional force on the plate by the screw 30 which can be rotated in the clamping rail.
  • the lamella can be adjusted particularly simply so that its deflection is equal to the deflection of the application roller at the contact line 31.
  • the cross section of the lamellar carrier can be kept relatively small. This measure reverses the direction of deflection.
  • Fig. 5 shows a third embodiment in which copying material with a top coating is developed.
  • the application roller 3 is arranged above the press roller 2, while the press roller 1 is pressed obliquely from below onto the press roller.
  • the application roller is uniformly supplied with developer fluid via a perforated feed line 32, from which the developer liquid flows onto the metering lamella, which presses diagonally below the application roller.
  • the application roller, the metering lamella and the perforated feed line are accommodated here in an upper housing part 33, which at the same time as an up catch pan for the developer liquid is used.
  • the transport plane 27 for the diazo copy material to be developed runs between the upper housing part 33 and a lower housing part 34 and between the press roller and the application roller.
  • the equatorial moment of inertia J 3 of the application roller is also determined here according to the design rule according to the invention, with a sign reversal for some of the forces having to be taken into account with regard to the configuration of the rollers.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
EP78100208A 1977-06-30 1978-06-21 Entwicklungseinrichtung zur Entwicklung von Diazokopiermaterial nach dem Halbfeuchtverfahren Expired EP0000175B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2729523A DE2729523C2 (de) 1977-06-30 1977-06-30 Entwicklungseinrichtung zur Entwicklung von Diazokopiermaterial nach dem Halbfeuchtverfahren
DE2729523 1977-06-30

Publications (2)

Publication Number Publication Date
EP0000175A1 EP0000175A1 (de) 1979-01-10
EP0000175B1 true EP0000175B1 (de) 1980-01-09

Family

ID=6012777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100208A Expired EP0000175B1 (de) 1977-06-30 1978-06-21 Entwicklungseinrichtung zur Entwicklung von Diazokopiermaterial nach dem Halbfeuchtverfahren

Country Status (5)

Country Link
US (1) US4155637A (hu)
EP (1) EP0000175B1 (hu)
JP (1) JPS5414235A (hu)
DE (2) DE2729523C2 (hu)
HU (1) HU178013B (hu)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2749627A1 (de) * 1977-11-05 1979-05-10 Hoechst Ag Entwicklungseinrichtung zur entwicklung von flaechigem diazokopiermaterial nach dem halbfeuchtverfahren
DE2837535A1 (de) * 1978-08-28 1980-03-20 Hoechst Ag Entwicklungseinrichtung zur entwicklung von flaechigem diazokopiermaterial nach dem halbfeuchtverfahren
EP0025615B1 (en) * 1979-09-13 1984-02-01 Agfa-Gevaert N.V. Apparatus for applying a processing liquid to a sheet or web material
ATE35830T1 (de) * 1983-10-07 1988-08-15 Triatex International Vorrichtung und verfahren zum aufbringen geregelter mengen an flotte auf eine aufnahmefaehige materialbahn.
DE3815538A1 (de) * 1988-05-06 1989-11-16 Hoechst Ag Verfahren zum herstellen von farbbildern
US5743964A (en) * 1995-01-24 1998-04-28 Fata Hunter, Inc. Roll coating system
CA2389557C (en) * 1999-11-26 2009-09-22 Unilever Plc Applicator for applying a fluid to a surface and method of applying a fluid to a surface
US6423138B1 (en) * 1999-12-22 2002-07-23 Eastman Kodak Company Coating apparatus having a cascade wall and metering blade, and a cleaning and recirculation arrangement for the coating apparatus
US6402398B1 (en) * 2000-05-25 2002-06-11 Eastman Kodak Company Apparatus and method for processing a photographic product
DE112007003687A5 (de) 2007-08-10 2010-07-22 Krauss, Gunter Strömungsenergieanlage, insbesondere Windkraftanlage
DE102012207920A1 (de) * 2012-05-11 2013-11-14 Trützschler Nonwovens Gmbh Foulard zum Applizieren eines Bindemittels auf ein Flor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245381A (en) * 1961-04-19 1966-04-12 Agfa Ag Developing apparatus
CH480669A (de) * 1967-09-25 1969-10-31 Gen Aniline & Film Corp Vorrichtung zum Entwickeln von sensibilisiertem Kopiepapier
US3640203A (en) * 1969-06-09 1972-02-08 Addressograph Multigraph Liquid developing apparatus
US3748996A (en) * 1972-04-03 1973-07-31 Ricoh Kk Wet developing device for diazo type copying machines
JPS4929838A (hu) * 1972-07-15 1974-03-16

Also Published As

Publication number Publication date
DE2729523B1 (de) 1978-06-22
US4155637A (en) 1979-05-22
EP0000175A1 (de) 1979-01-10
DE2857513D1 (en) 1980-02-14
JPS5414235A (en) 1979-02-02
DE2729523C2 (de) 1979-03-15
HU178013B (en) 1982-02-28

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