EP0378497B1 - Device for controlling and regulating the damping solution in an offset-printing system - Google Patents

Device for controlling and regulating the damping solution in an offset-printing system Download PDF

Info

Publication number
EP0378497B1
EP0378497B1 EP90440003A EP90440003A EP0378497B1 EP 0378497 B1 EP0378497 B1 EP 0378497B1 EP 90440003 A EP90440003 A EP 90440003A EP 90440003 A EP90440003 A EP 90440003A EP 0378497 B1 EP0378497 B1 EP 0378497B1
Authority
EP
European Patent Office
Prior art keywords
tank
damping
solution
measuring
troughs
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
EP90440003A
Other languages
German (de)
French (fr)
Other versions
EP0378497A1 (en
Inventor
Alain Zanon
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0378497A1 publication Critical patent/EP0378497A1/en
Application granted granted Critical
Publication of EP0378497B1 publication Critical patent/EP0378497B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/32—Ducts, containers, or like supply devices for liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening

Definitions

  • the present invention relates to a device for controlling and regulating the fountain water in an offset printing system.
  • the wetting water must indeed have pH, surface tension and non-hardness properties which allow it to constitute with the ink an effective ink mixture of constant quality. To this end, it is added with products which aim to stabilize its pH throughout the draft and to improve its surface tension, as well as to reduce its hardness if necessary.
  • a fountain water which is particularly suitable for offset printing has a pH of between 4.8 and 5.5 and a hydrotimetric titre (TH) of between 12 and 18, the latter parameter defining the hardness of water expressed in fractions of 10 mg / l of CaCO3. It is also advantageously added with alcohol isopropyl which improves surface tension.
  • TH hydrotimetric titre
  • Maintaining these various parameters at suitable values requires the prior measurement of the pH of the tap water used and the addition of appropriate additives, including isopropyl alcohol, as well as their control at regular intervals to compensate for variations. of composition that the wetting water undergoes during the drawing.
  • the dampening water is therefore generally subjected to measurements, regularly spaced over time, which are most often carried out by means of a portable battery-operated pH meter and a hydrometer intended for monitoring the content of isopropyl alcohol. .
  • the tank is suitably refrigerated by any suitable means such as a coil connected to a cooling device.
  • the means used so far to control the quality of the fountain water do not give satisfactory results, mainly due to the fact that on the one hand the control of the isopropyl alcohol content is carried out by densimetry and that, on the other hand, the pH measurement most often consists in an assay with an imprecise percentage, or in a measurement carried out by means of an electrode immersed in the tank.
  • the pH measurement electrode being immersed in the tank, it undergoes progressive fouling due to a more or less accentuated stagnation phenomenon which requires the addition of fungicides and gums as well as that of buffered acid additives aimed at keep the pH as constant as possible and allow the spacing of the control measures for this parameter.
  • the measurement of the density of the water does not allow reliable control of the isopropyl alcohol content, due to the pollutants liable to distort this type of measurement.
  • EP-A-0.170.160 discloses a device for controlling and regulating fountain water in an offset printing system in which a pH measuring electrode and a conductivity measuring cell are arranged in the tank with the drawbacks mentioned above concerning the fouling of the electrode.
  • the injection of acid and isopropyl alcohol is carried out directly in this same tank, at locations distant from each other, so that the homogenization of the mixture is not ensured.
  • the object of the present invention is to propose a solution to the problem thus posed of the consistency of the quality of the wetting water in offset printing.
  • the device according to the invention is advantageously supplemented by two filters arranged on the one hand between the tank and the pump and on the other hand at the outlet of the mooring tanks and making it possible to rid the water of suspended impurities.
  • It may also include, on the return path from the mooring tanks, a bypass provided with a valve allowing the punctual injection of water to avoid foaming in the tank in the event of clogging of the filter.
  • It also includes a temperature probe placed in the tank and allowing the temperature of the water to be monitored during operation.
  • the acid additive used in the device according to the invention is advantageously an acid solution with a pH close to 3.
  • This additive can be, inter alia, a solution of phosphoric acid with pH 3.
  • the device according to the invention makes it possible to avoid the use of commonly used buffered wetting additives, which most often contain, in addition to a buffered acid mixture, gums, wetting agents and fungicides.
  • the use of a simple acid solution is in fact made possible, in the device according to the invention, on the one hand thanks to the positioning of the measurement electrode and to the agitation maintained in the tank by the pump, and on the other hand to the presence of an electronic pH meter which constantly controls the pH and readjusts it automatically by commanding the metering pump associated with it the injection of a quantity of acid additive sufficient to bring back this parameter at the selected value.
  • the isopropyl alcohol content of the wetting water is moreover controlled by means of a conductivity measuring cell connected to an electronic conductivity meter associated with a metering pump which allows the automatic readjustment of this parameter throughout the operation. draw.
  • the pH meter and the conductivity meter used in the device according to the invention are advantageously electronic transmitters each comprising a proportional regulator with adjustable threshold.
  • the metering pumps associated with the electronic conductivity meter and pH meter are advantageously electromagnetic metering pumps which take the two additives from containers containing them, according to the orders received from the two devices which control their respective operations, and inject them into the tank at by means of injection rods.
  • the temperature probe placed in the tank is connected to a display means allowing temperature control, maintained at an optimum value thanks to a refrigeration unit extended by a coil placed in the tank.
  • the device according to the invention can advantageously be associated with an annex analysis apparatus making it possible to constitute the optimum mixture before filling the tank, or before adding additional wetting water during operation, this apparatus d 'analyzes can be supplemented, if necessary, by a conventional water softener.
  • the wetting water contained in the tank 1 is sucked by the pump 4 via the pipe 5 of the tank 1 outlet and immediately passes through a filter 6 which rids it of suspended impurities.
  • the pump 4 discharges the wetting water into a pipe 7 which partly routes it to the wetting tanks 8 via a pipe 9, partly to the tank 1 via a pipe 13 and partly to a venturi 10, creating a sufficient vacuum to suck the water out of the wetting tanks 8 through an outlet pipe 11.
  • the water returning from the tanks 8, prior to its passage through the venturi 10, is filtered by a filter 12 which removes the impurities from it anchorage.
  • the wetting water After passing through the venturi 10, the wetting water is returned to the tank 1 via a pipe 14 which houses, near the tank 1, an electrode 15 for measuring the pH and a cell 15 ′ for measuring the conductivity.
  • the electrode 15 is connected to an electronic pH meter 16 ensuring the measurement and regulation of the pH, associated with an electromagnetic metering pump 17 connected to a container 18 containing the chosen acid additive.
  • the conductivity measuring cell 15 ′ is connected to an electronic conductimeter 19 ensuring the measurement and regulation of the isopropyl alcohol content, by means of an electromagnetic metering pump 20 connected to a container 21 containing this product.
  • the metering pump 17 associated with the pH meter 16 injects the acid additive by means of an injection pipe 22 which opens into the pipe 14 downstream of the electrode 15.
  • the metering pump 20 associated with the conductivity measuring cell 15 ′ injects isopropyl alcohol by means of an injection pipe 23 which opens into the pipe 14 also downstream of the electrode 15.
  • a pipe 26 connected to the pipe 5 leaving the tank 1 allows, thanks to a valve 27, to drain the tank 1, while a valve 29 allows the regular addition of water from the tap or water standardized by a pipe 28 opening at the top of the tank.
  • This valve 29 can advantageously be controlled by a level tester which triggers the automatic supply of small quantities of water when the level of the tank drops.
  • the pump 4 in addition to supplying the wetting tanks 8, also ensures a permanent circulation of the wetting water in the tank 1 thanks to the pipe 13 which brings a part of it directly to tank 1, this permanent circulation allowing the rapid homogenization of the water-additives mixture and also preventing the formation of rust and fungi caused by the stagnation of water.
  • the positioning of the electrode 15 and of the cell 15 ′ in a pipe where the water circulates constantly results in an automatic cleaning effect preventing their fouling.
  • the device according to the invention thus offers operating safety based on the constant quality of the wetting water, which constitutes a completely appreciable advantage compared to known devices.

Abstract

This device comprises in combination: a) arranged in the pipeline (14) for return to the tanks (8), at its inlet into the vessel (1), a pH-measuring electrode (15) and a cell (15') for measuring the conductivity of the dampening solution; b) connected to the pH-measuring electrode (15), an electronic pH-meter (16) associated with a proportioning pump (17); c) connected to the cell (15'), an electronic conductimeter (19) associated with a proportioning pump (20); d) arranged in the vicinity of the vessel, a pump (4) ensuring the continuous circulation of the dampening solution in the vessel (1) and its conveyance towards the dampening tanks (8); e) arranged between the vessel (1) and the dampening tanks (8), on the return pipeline (11), a nozzle (10) intended for sucking up the dampening solution coming out of said tanks (8) in order to reintroduce it into the vessel (1). <IMAGE>

Description

La présente invention a pour objet un dispositif permettant le contrôle et la régulation de l'eau de mouillage dans un système d'impression offset.The present invention relates to a device for controlling and regulating the fountain water in an offset printing system.

On sait les problèmes posés, dans l'impression offset, par la qualité de l'eau de mouillage, et plus spécialement par les variations de sa composition au cours du temps, notamment lorsqu'elle est recyclée.We know the problems posed in offset printing by the quality of the fountain water, and more particularly by the variations in its composition over time, especially when it is recycled.

L'eau de mouillage doit en effet présenter des propriétés de pH, de tension superficielle et de non-dureté qui lui permettent de constituer avec l'encre un mélange encreur efficace et de qualité constante. Elle est à cette fin additionnée de produits qui visent à stabiliser son pH tout au long du tirage et à améliorer sa tension superficielle, ainsi qu'à réduire sa dureté si nécessaire.The wetting water must indeed have pH, surface tension and non-hardness properties which allow it to constitute with the ink an effective ink mixture of constant quality. To this end, it is added with products which aim to stabilize its pH throughout the draft and to improve its surface tension, as well as to reduce its hardness if necessary.

L'expérience a montré qu'une eau de mouillage particulièrement appropriée à l'impression offset présente un pH compris entre 4,8 et 5,5 et un titre hydrotimétrique (TH) compris entre 12 et 18, ce dernier paramètre définissant la dureté de l'eau exprimée en fractions de 10 mg/l de CaCO₃. Elle est en outre avantageusement additionnée d'alcool isopropylique qui permet d'en améliorer la tension superficielle.Experience has shown that a fountain water which is particularly suitable for offset printing has a pH of between 4.8 and 5.5 and a hydrotimetric titre (TH) of between 12 and 18, the latter parameter defining the hardness of water expressed in fractions of 10 mg / l of CaCO₃. It is also advantageously added with alcohol isopropyl which improves surface tension.

Le maintien de ces différents paramètres à des valeurs convenables nécessite la mesure préalable du pH de l'eau du robinet utilisée et l'adjonction d'additifs appropriés, parmi lesquels l'alcool isopropylique, ainsi que leur contrôle à intervalles réguliers pour pallier les variations de composition que l'eau de mouillage subit au cours du tirage.Maintaining these various parameters at suitable values requires the prior measurement of the pH of the tap water used and the addition of appropriate additives, including isopropyl alcohol, as well as their control at regular intervals to compensate for variations. of composition that the wetting water undergoes during the drawing.

L'eau de mouillage est ainsi généralement soumise à des mesures, régulièrement espacées dans le temps, qui sont le plus souvent effectuées au moyen d'un pH-mètre portatif à pile et d'un densimètre destiné au contrôle de la teneur en alcool isopropylique. Ce dernier produit étant volatil, la cuve est convenablement réfrigérée par tout moyen approprié tel qu'un serpentin relié à un dispositif de refroidissement.The dampening water is therefore generally subjected to measurements, regularly spaced over time, which are most often carried out by means of a portable battery-operated pH meter and a hydrometer intended for monitoring the content of isopropyl alcohol. . As the latter product is volatile, the tank is suitably refrigerated by any suitable means such as a coil connected to a cooling device.

Toutefois, les moyens mis en oeuvre jusqu'ici pour contrôler la qualité de l'eau de mouillage ne donnent pas de résultats satisfaisants, principalement en raison du fait que d'une part le contrôle de la teneur en alcool isopropylique est effectué par densimétrie et que d'autre part la mesure de pH consiste le plus souvent en un dosage au pourcentage peu précis, ou en une mesure effectuée au moyen d'une électrode immergée dans la cuve.However, the means used so far to control the quality of the fountain water do not give satisfactory results, mainly due to the fact that on the one hand the control of the isopropyl alcohol content is carried out by densimetry and that, on the other hand, the pH measurement most often consists in an assay with an imprecise percentage, or in a measurement carried out by means of an electrode immersed in the tank.

L'électrode de mesure de pH étant immergée dans la cuve, elle subit un encrassement progressif du fait d'un phénomène de stagnation plus ou moins accentué qui nécessite l'adjonction de fongicides et de gommes ainsi que celle d'additifs acides tamponnés visant à maintenir le pH le plus constant possible et à permettre l'espacement des mesures de contrôle de ce paramètre.The pH measurement electrode being immersed in the tank, it undergoes progressive fouling due to a more or less accentuated stagnation phenomenon which requires the addition of fungicides and gums as well as that of buffered acid additives aimed at keep the pH as constant as possible and allow the spacing of the control measures for this parameter.

Par ailleurs, la mesure de la densité de l'eau ne permet pas un contrôle fiable de la teneur en alcool isopropylique, en raison des agents polluants susceptibles de fausser ce type de mesure.Furthermore, the measurement of the density of the water does not allow reliable control of the isopropyl alcohol content, due to the pollutants liable to distort this type of measurement.

On connaît, par EP-A- 0.170.160, un dispositif pour le contrôle et la régulation de l'eau de mouillage dans un système d'impression offset dans lequel une électrode de mesure du pH et une cellule de mesure de la conductivité sont disposées dans la cuve avec les inconvénients cités précédemment concernant l'encrassement de l'électrode. En outre, l'injection d'acide et d'alcool isopropylique s'effectue directement dans cette même cuve, à des emplacements éloignés l'une de l'autre, de sorte que l'homogénéisation du mélange n'est pas assurée.EP-A-0.170.160 discloses a device for controlling and regulating fountain water in an offset printing system in which a pH measuring electrode and a conductivity measuring cell are arranged in the tank with the drawbacks mentioned above concerning the fouling of the electrode. In addition, the injection of acid and isopropyl alcohol is carried out directly in this same tank, at locations distant from each other, so that the homogenization of the mixture is not ensured.

On connaît également, par GB-A- 1.154.771, un dispositif de même type dans lequel le poids spécifique de la solution est mesuré par un système à flotteur dans une dérivation. Ce dispositif connu ne permet pas de connaître de manière précise la teneur en acide de la solution et est muet sur la mesure du pH. Ce dispositif connu présente en outre les mêmes inconvénients que le dispositif précédent en ce qui concerne l'emplacement d'injection de l'additif.We also know from GB-A-1,154,771 a device of the same type in which the specific weight of the solution is measured by a float system in a bypass. This known device does not make it possible to know precisely the acid content of the solution and is silent on the measurement of the pH. This known device also has the same drawbacks as the previous device with regard to the location of injection of the additive.

La présente invention a pour but de proposer une solution au problème ainsi posé de la constance de qualité de l'eau de mouillage en imprimerie offset.The object of the present invention is to propose a solution to the problem thus posed of the consistency of the quality of the wetting water in offset printing.

La présente invention a ainsi pour objet un dispositif permettant le contrôle et la régulation de l'eau de mouillage dans un système d'impression offset, du type comportant une cuve réfrigérée dans laquelle la composition de l'eau de mouillage est ajustée préalablement à son envoi dans les bacs de mouillage par addition d'alcool isopropylique et d'un additif acide, du type comprenant :

  • a) une électrode de mesure du pH et une cellule de mesure de la conductivité de l'eau de mouillage;
  • b) relié à l'électrode de mesure du pH, un pH-mètre électronique associé à une pompe doseuse destinée à prélever dans un récipient la quantité d'additif acide suffisante pour ramener le pH à une valeur prédéterminée enregistrée par ledit pH-mètre;
  • c) relié à la cellule un conductimètre électronique associé à une pompe doseuse destinée à prélever dans un récipient la quantité d'alcool isopropylique suffisante pour en ramener la teneur à une valeur prédéterminée enregistrée par ledit conductimètre
  • d) disposée au voisinage de la cuve, une pompe assurant la circulation permanente de l'eau de mouillage dans la cuve ainsi que son acheminement vers les bacs de mouillage;
  • e) disposée entre la cuve et lesdits bacs de mouillage, sur la canalisation de sortie des bacs de mouillage une tuyère ayant pour fonction d'aspirer l'eau de mouillage sortant desdits bacs pour la réintroduire dans la cuve, dispositif caractérisé en ce que
  • f) l'électrode de mesure du pH et la cellule de mesure de la conductivité de l'eau de mouillage sont disposées dans une canalisation ramenant l'eau de mouillage à ladite cuve à l'entrée de ladite canalisation dans la cuve; et
  • g) les pompes doseuses sont agencées pour injecter respectivement l'additif acide et l'alcool isopropylique dans ladite canalisation ramenant l'eau de mouillage à la cuve en aval de ladite électrode et de ladite cellule.
The present invention thus relates to a device for controlling and regulating the wetting water in an offset printing system, of the type comprising a refrigerated tank in which the composition of the wetting water is adjusted prior to its sent to the wetting tanks by addition of isopropyl alcohol and an acid additive, of the type comprising:
  • a) a pH measuring electrode and a cell for measuring the conductivity of the fountain water;
  • b) connected to the pH measurement electrode, an electronic pH meter associated with a metering pump intended to take from a container the quantity of acid additive sufficient to bring the pH to a predetermined value recorded by said pH meter;
  • c) connected to the cell an electronic conductivity meter associated with a metering pump intended to take from a container the quantity of isopropyl alcohol sufficient to reduce the content thereof to a predetermined value recorded by said conductivity meter
  • d) arranged in the vicinity of the tank, a pump ensuring the permanent circulation of the wetting water in the tank as well as its routing towards the wetting tanks;
  • e) disposed between the tank and said wetting tanks, on the outlet pipe of the wetting tanks a nozzle having the function of sucking the wetting water leaving said tanks to reintroduce it into the tank, device characterized in that
  • f) the electrode for measuring the pH and the cell for measuring the conductivity of the wetting water are arranged in a pipe bringing the wetting water to said tank at the inlet of said pipe into the tank; and
  • g) the metering pumps are arranged to inject respectively the acid additive and the isopropyl alcohol into said pipe bringing the wetting water back to the tank downstream of said electrode and said cell.

Le dispositif selon l'invention est avantageusement complété par deux filtres disposés d'une part entre la cuve et la pompe et d'autre part à la sortie des bacs de mouillage et permettant de débarasser l'eau des impuretés en suspension.The device according to the invention is advantageously supplemented by two filters arranged on the one hand between the tank and the pump and on the other hand at the outlet of the mooring tanks and making it possible to rid the water of suspended impurities.

Il peut également comporter, sur le chemin de retour des bacs de mouillage, une dérivation munie d'une vanne permettant l'injection ponctuelle d'eau pour éviter la formation de mousse dans la cuve en cas d'encrassement du filtre.It may also include, on the return path from the mooring tanks, a bypass provided with a valve allowing the punctual injection of water to avoid foaming in the tank in the event of clogging of the filter.

Il comporte en outre une sonde de température placée dans la cuve et permettant de contrôler la température de l'eau pendant son fonctionnement.It also includes a temperature probe placed in the tank and allowing the temperature of the water to be monitored during operation.

L'additif acide mis en oeuvre dans le dispositif selon l'invention est avantageusement une solution acide de pH voisin de 3. Cet additif peut être, entre autres, une solution d'acide phosphorique de pH 3.The acid additive used in the device according to the invention is advantageously an acid solution with a pH close to 3. This additive can be, inter alia, a solution of phosphoric acid with pH 3.

Il convient ici de souligner que le dispositif selon l'invention permet d'éviter le recours aux additifs de mouillage tamponnés couramment utilisés, qui renferment le plus souvent, outre un mélange acide tamponné, des gommes, des agents mouillants et des fongicides. L'utilisation d'une simple solution acide est en effet rendue possible, dans le dispositif selon l'invention, grâce d'une part au positionnement de l'électrode de mesure et à l'agitation entretenue dans la cuve par la pompe, et d'autre part à la présence d'un pH-mètre électronique qui contrôle de manière constante le pH et le réajuste automatiquement en commandant à la pompe doseuse qui lui est associée l'injection d'une quantité d'additif acide suffisante pour ramener ce paramètre à la valeur choisie.It should be emphasized here that the device according to the invention makes it possible to avoid the use of commonly used buffered wetting additives, which most often contain, in addition to a buffered acid mixture, gums, wetting agents and fungicides. The use of a simple acid solution is in fact made possible, in the device according to the invention, on the one hand thanks to the positioning of the measurement electrode and to the agitation maintained in the tank by the pump, and on the other hand to the presence of an electronic pH meter which constantly controls the pH and readjusts it automatically by commanding the metering pump associated with it the injection of a quantity of acid additive sufficient to bring back this parameter at the selected value.

La teneur en alcool isopropylique de l'eau de mouillage est par ailleurs contrôlée au moyen d'une cellule de mesure de conductivité reliée à un conductimètre électronique associé à une pompe doseuse qui permet le réajustement automatique de ce paramètre tout au long de l'opération de tirage.The isopropyl alcohol content of the wetting water is moreover controlled by means of a conductivity measuring cell connected to an electronic conductivity meter associated with a metering pump which allows the automatic readjustment of this parameter throughout the operation. draw.

Le pH-mètre et le conductimètre mis en oeuvre dans le dispositif selon l'invention sont avantageusement des transmetteurs électroniques comportant chacun un régulateur proportionnel à seuil réglable.The pH meter and the conductivity meter used in the device according to the invention are advantageously electronic transmitters each comprising a proportional regulator with adjustable threshold.

Les pompes doseuses associées au conductimètre et au pH-mètre électroniques sont avantageusement des pompes doseuses électromagnétiques qui prélèvent les deux additifs dans des récipients les contenant, en fonction des ordres reçus des deux appareils qui commandent leurs fonctionnements respectifs, et les injectent dans la cuve au moyen de cannes d'injection.The metering pumps associated with the electronic conductivity meter and pH meter are advantageously electromagnetic metering pumps which take the two additives from containers containing them, according to the orders received from the two devices which control their respective operations, and inject them into the tank at by means of injection rods.

Le positionnement de l'électrode de mesure du pH et de la cellule de mesure de la conductivité joue un rôle important dans l'efficacité de la régulation de l'eau de mouillage. Il est apparu, à l'étude de ce problème, que le meilleur emplacement pour ces capteurs de mesure se situe dans la canalisation de retour des bacs de mouillage, à son entrée dans la cuve, les cannes d'injection reliées aux pompes doseuses débouchant également dans cette canalisation, en aval des capteurs de mesure, de manière à permettre une homogénéisation optimale des produits injectés avec l'eau de mouillage.The positioning of the pH measuring electrode and the conductivity measuring cell plays an important role in the efficiency of the dampening water regulation. It appeared, when studying this problem, that the best location for these measurement sensors is in the return line of the mooring tanks, at its entry into the tank, the injection rods connected to the metering pumps opening also in this pipe, downstream of the measurement sensors, so as to allow optimal homogenization of the products injected with the wetting water.

La sonde de température placée dans la cuve est reliée à un moyen d'affichage permettant le contrôle de la température, maintenue à une valeur optimum grâce à un groupe frigorifique prolongé par un serpentin disposé dans la cuve.The temperature probe placed in the tank is connected to a display means allowing temperature control, maintained at an optimum value thanks to a refrigeration unit extended by a coil placed in the tank.

Le dispositif selon l'invention peut être avantageusement associé à un appareil d'analyses annexe permettant de constituer le mélange optimum avant remplissage de la cuve, ou avant apport d'un complément d'eau de mouillage en cours d'opération, cet appareil d'analyses pouvant être complété, si besoin est, par un adoucisseur d'eau de type classique.The device according to the invention can advantageously be associated with an annex analysis apparatus making it possible to constitute the optimum mixture before filling the tank, or before adding additional wetting water during operation, this apparatus d 'analyzes can be supplemented, if necessary, by a conventional water softener.

La présente invention sera mieux comprise à la lecture de la description qui suit d'un mode de réalisation du dispositif selon l'invention illustré par le dessin annexé, étant bien entendu que cette description ne présente aucun caractère limitatif vis-à-vis de l'invention.The present invention will be better understood on reading the following description of an embodiment of the device according to the invention illustrated by the appended drawing, it being understood that this description has no limiting character with respect to the invention.

La figure unique du dessin annexé représente une vue schématique d'un dispositif selon l'invention.The single figure of the accompanying drawing shows a schematic view of a device according to the invention.

On y voit la cuve 1 équipée d'un serpentin de refroidissement 2 et d'une sonde de température 3. L'eau de mouillage contenue dans la cuve 1 est aspirée par la pompe 4 via la canalisation 5 de sortie de la cuve 1 et passe aussitôt par un filtre 6 qui la débarasse des impuretés en suspension.We see the tank 1 equipped with a cooling coil 2 and a temperature probe 3. The wetting water contained in the tank 1 is sucked by the pump 4 via the pipe 5 of the tank 1 outlet and immediately passes through a filter 6 which rids it of suspended impurities.

La pompe 4 refoule l'eau de mouillage dans une canalisation 7 qui l'achemine pour partie vers les bacs de mouillage 8 via une canalisation 9, pour partie vers la cuve 1 via une canalisation 13 et pour partie vers un venturi 10, créant une dépression suffisante pour aspirer l'eau sortant des bacs de mouillage 8 par une canalisation de sortie 11. L'eau de retour des bacs 8, préalablement à son passage par le venturi 10, est filtrée par un filtre 12 qui la débarrasse des impuretés provenant du mouillage.The pump 4 discharges the wetting water into a pipe 7 which partly routes it to the wetting tanks 8 via a pipe 9, partly to the tank 1 via a pipe 13 and partly to a venturi 10, creating a sufficient vacuum to suck the water out of the wetting tanks 8 through an outlet pipe 11. The water returning from the tanks 8, prior to its passage through the venturi 10, is filtered by a filter 12 which removes the impurities from it anchorage.

Après passage par le venturi 10, l'eau de mouillage est ramenée vers la cuve 1 via une canalisation 14 qui abrite, à proximité de la cuve 1, une électrode 15 de mesure du pH et une cellule 15′ de mesure de la conductivité.After passing through the venturi 10, the wetting water is returned to the tank 1 via a pipe 14 which houses, near the tank 1, an electrode 15 for measuring the pH and a cell 15 ′ for measuring the conductivity.

L'électrode 15 est reliée à un pH-mètre électronique 16 assurant la mesure et la régulation du pH, associée à une pompe doseuse électromagnétique 17 reliée à un récipient 18 contenant l'additif acide choisi.The electrode 15 is connected to an electronic pH meter 16 ensuring the measurement and regulation of the pH, associated with an electromagnetic metering pump 17 connected to a container 18 containing the chosen acid additive.

La cellule 15′ de mesure de la conductivité est reliée à un conductimètre électronique 19 assurant la mesure et la régulation de la teneur en alcool isopropylique, au moyen d'une pompe doseuse électromagnétique 20 reliée à un récipient 21 contenant ce produit.The conductivity measuring cell 15 ′ is connected to an electronic conductimeter 19 ensuring the measurement and regulation of the isopropyl alcohol content, by means of an electromagnetic metering pump 20 connected to a container 21 containing this product.

La pompe doseuse 17 associée au pH-mètre 16 injecte l'additif acide au moyen d'une canne d'injection 22 qui débouche dans la canalisation 14 en aval de l'électrode 15.The metering pump 17 associated with the pH meter 16 injects the acid additive by means of an injection pipe 22 which opens into the pipe 14 downstream of the electrode 15.

De la même manière, la pompe doseuse 20 associée à la cellule 15′ de mesure de la conductivité injecte l'alcool isopropylique au moyen d'une canne d'injection 23 qui débouche dans la canalisation 14 également en aval de l'électrode 15.Likewise, the metering pump 20 associated with the conductivity measuring cell 15 ′ injects isopropyl alcohol by means of an injection pipe 23 which opens into the pipe 14 also downstream of the electrode 15.

Une canalisation 24 montée entre la canalisation de retour 11 de l'eau de mouillage et la cuve 1, en amont du venturi 10, permet, au moyen d'une vanne 25 normalement fermée, de réinjecter de l'eau dans la cuve 1 pour pallier si nécessaire la formation de mousse consécutive à l'encrassement du filtre 12, jusqu'à son remplacement ou son nettoyage.A pipe 24 mounted between the return pipe 11 of the wetting water and the tank 1, upstream of the venturi 10, allows, by means of a normally closed valve 25, to reinject water into the tank 1 to if necessary, compensate for the formation of foam following fouling of the filter 12, until it is replaced or cleaned.

Par ailleurs, une canalisation 26 branchée sur la canalisation 5 de sortie de la cuve 1 permet, grâce à une vanne 27, d'effectuer la vidange de la cuve 1, tandis qu'une vanne 29 permet l'adjonction régulière d'eau du robinet ou d'eau normalisée par une canalisation 28 débouchant en haut de la cuve. Cette vanne 29 peut être avantageusement commandée par un testeur de niveau qui déclenche l'apport automatique de petites quantités d'eau lorsque le niveau de la cuve baisse.Furthermore, a pipe 26 connected to the pipe 5 leaving the tank 1 allows, thanks to a valve 27, to drain the tank 1, while a valve 29 allows the regular addition of water from the tap or water standardized by a pipe 28 opening at the top of the tank. This valve 29 can advantageously be controlled by a level tester which triggers the automatic supply of small quantities of water when the level of the tank drops.

Ainsi qu'on peut le comprendre aisément, la pompe 4, outre l'alimentation des bacs de mouillage 8, assure également une circulation permanente de l'eau de mouillage dans la cuve 1 grâce à la canalisation 13 qui en ramène directement une partie à la cuve 1, cette circulation permanente permettant l'homogénéisation rapide du mélange eau-additifs et empêchant par ailleurs la formation de rouille et de champignons entraînée par la stagnation de l'eau.As can be easily understood, the pump 4, in addition to supplying the wetting tanks 8, also ensures a permanent circulation of the wetting water in the tank 1 thanks to the pipe 13 which brings a part of it directly to tank 1, this permanent circulation allowing the rapid homogenization of the water-additives mixture and also preventing the formation of rust and fungi caused by the stagnation of water.

Par ailleurs, le positionnement de l'électrode 15 et de la cellule 15′ dans une canalisation où l'eau circule constamment, entraîne un effet de nettoyage automatique empêchant leur encrassement.Furthermore, the positioning of the electrode 15 and of the cell 15 ′ in a pipe where the water circulates constantly, results in an automatic cleaning effect preventing their fouling.

L'agitation permanente de l'eau de mouillage dans la cuve 1, jointe au positionnement des moyens de mesure constitués par l'électrode 15 et la cellule 15′ et à la régulation permanente autorisée par les transmetteurs électroniques 16 et 19, conduit à l'obtention d'une eau de mouillage de qualité constante, et ce par la simple adjonction automatique d'un additif acide et d'alcool isopropylique, sans qu'il soit nécessaire de faire appel à des additifs tamponnés complexes tels que ceux utilisés jusqu'ici.The permanent agitation of the wetting water in the tank 1, combined with the positioning of the measuring means constituted by the electrode 15 and the cell 15 ′ and with the permanent regulation authorized by the electronic transmitters 16 and 19, leads to the water constant quality wetting, by the simple automatic addition of an acid additive and isopropyl alcohol, without the need to use complex buffered additives such as those used hitherto.

Le dispositif selon l'invention offre ainsi une sécurité de fonctionnement fondée sur la qualité constante de l'eau de mouillage, ce qui constitue un avantage tout à fait appréciable par rapport aux dispositifs connus.The device according to the invention thus offers operating safety based on the constant quality of the wetting water, which constitutes a completely appreciable advantage compared to known devices.

Claims (10)

  1. A device allowing the control and regulation of the damping solution in an off-set printing system, of the type comprising a refrigerated tank (1) in which the composition of the damping solution is adjusted prior to its being sent to the damping troughs (8) by the addition of isopropylic alcohol and an acid additive, of the type comprising:
    a) an electrode (15) for measuring the pH and a cell (15′) for measuring the conductivity of the damping solution;
    b) an electronic pH meter (16) which is connected to the pH measuring electrode (15) and linked to a metering pump (17) intended to draw into a container (18) the quantity of acid additive sufficient to bring the pH to a predetermined value stored by the said pH meter (16);
    c) an electronic conductivity meter (19) which is connected to the cell (15′) and linked to a metering pump (20) intended to draw into a container (21) the quantity of isopropylic alcohol sufficient for bringing the content thereof to a predetermined value stored by the said conductivity meter (19);
    d) a pump (4) which is disposed in proximity to the tank (1) and assures the permanent circulation of the damping solution in the tank (1) as well as its flow towards the damping troughs (8);
    e) a nozzle (10) which is disposed on the outlet conduit (11) of the said damping troughs between the tank (1) and the damping troughs (8) and has the function of drawing up the damping solution leaving the said troughs (8) in order to reintroduce it into the tank (1),
    characterised in that
    f) the pH measuring electrode (15) and the cell (15′) for measuring the conductivity of the damping solution are disposed in a conduit (14) taking the damping solution to the said tank (1), at the inlet of the said conduit (14) into the tank; and
    g) the metering pumps (18, 20) are designed in order to inject respectively the acid additive and the isopropylic alcohol into the said conduit (14) taking the damping solution to the tank (1), downstream of the said electrode (15) and the said cell (15′).
  2. A device according claim 1, characterised in that a filter is disposed on the outlet conduit (5) of the tank (1) and outlet (11) of the said damping troughs (8), the filter (6) of the outlet conduit (5) between the tank (1) and the pump (4) and the filter (12) of the outlet conduit (11) between the damping troughs (8) and the nozzle (10).
  3. A device according to claim 1 or claim 2, characterised in that the electronic pH meter (16) connected to the pH measuring electrode (15) is a pH transmitter comprising a proportional control unit with a controllable threshold.
  4. A device according to claim 1 or claim 2, characterised in that the electronic conductivity meter (19) connected to the conductivity measuring cell (15′) is an electronic transmitter comprising a proportional control unit with a controllable threshold.
  5. A device according to any one of the preceding claims, characterised in that the acid additive and the isopropylic alcohol are injected by the metering pumps (17, 20) by means of injection pipes (22, 23).
  6. A device according to any one of the preceding claims, characterised in that the acid additive injected by the metering pump (17) is an acid solution of a pH adjacent to pH 3, ie lightly buffered.
  7. A device according to any one of the preceding claims, characterised in that the pump (4) sends part of the damping solution coming from the tank (1) towards the damping troughs (8) by way of a conduit (9), part towards the nozzle (10) and part towards the tank by way of a conduit (13), thus assuring the permanent circulation in the tank (1).
  8. A device according to any one of the preceding claims, characterised in that the nozzle (10) is a venturi nozzle.
  9. A device according to any one of the preceding claims, characterised in that it comprises a related analysis device allowing the mixture to be optimally constituted prior to filling the tank (1) or prior to conveyance of a complement of damping solution during the course of the operation.
  10. A device according to claim 9, characterised in that the said analysis device controls the total hardness (TH) of the solution.
EP90440003A 1989-01-13 1990-01-15 Device for controlling and regulating the damping solution in an offset-printing system Expired - Lifetime EP0378497B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900517A FR2641733B1 (en) 1989-01-13 1989-01-13 DEVICE FOR CONTROLLING AND REGULATING WET WATER IN AN OFFSET PRINTING SYSTEM
FR8900517 1989-01-13

Publications (2)

Publication Number Publication Date
EP0378497A1 EP0378497A1 (en) 1990-07-18
EP0378497B1 true EP0378497B1 (en) 1994-07-06

Family

ID=9377800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90440003A Expired - Lifetime EP0378497B1 (en) 1989-01-13 1990-01-15 Device for controlling and regulating the damping solution in an offset-printing system

Country Status (4)

Country Link
EP (1) EP0378497B1 (en)
AT (1) ATE108134T1 (en)
DE (1) DE69010342T2 (en)
FR (1) FR2641733B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5368817A (en) * 1992-07-08 1994-11-29 Toppan Printing, Co., Ltd. Dampening water controller
EP1310361A2 (en) 2001-11-10 2003-05-14 MAN Roland Druckmaschinen AG Device for preparing fountain solution
DE10159159A1 (en) * 2001-12-01 2003-06-18 Technotrans Ag Dosing device for an offset print machine, is used to control the precise adjustment of water, alcohol and additive mixtures with proportional output pumps used in the additive lines so that additional flowmeters are not needed
DE102008045421A1 (en) 2008-09-02 2010-03-04 Technotrans Ag Car wash for printing presses

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19546971A1 (en) * 1995-12-15 1997-06-19 Baldwin Gegenheimer Gmbh Device of a printing press
WO2001028776A1 (en) * 1999-10-17 2001-04-26 Royse Manufacturing Co. Printing press fountain solution system and method thereof
US6651555B2 (en) * 2000-09-25 2003-11-25 Day International, Inc. Dampening solution recirculator
DE10219443A1 (en) * 2002-05-02 2003-11-20 Roland Man Druckmasch Method and device for operating a temperature control device
CN106183366A (en) * 2016-08-25 2016-12-07 北京图文天地制版印刷有限公司 A kind of printer can be with the device of monitoring pH value

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932491C (en) * 1954-02-24 1955-09-01 Roland Offsetmaschf Dampening system for lithographic printing machines
US3485257A (en) * 1966-07-11 1969-12-23 Baldwin Gegenheimer Corp Fountain solution system and apparatus therefor
US3557817A (en) * 1969-05-05 1971-01-26 Edwin H Royse Control for mixing fluids of different specific gravity
US3947356A (en) * 1972-11-20 1976-03-30 Maschinenfabrik Wifag Arrangement for regulating the moistening solution mixture in a moistening solution preparation plant for an offset printing press
IT1180802B (en) * 1984-08-01 1987-09-23 Web Italia Srl SYSTEM FOR THE CONTINUOUS FEEDING OF THE WATERING SOLUTION IN THE OFFSET PRINTING PROCESSES
US4745953A (en) * 1985-11-26 1988-05-24 Dai Nippon Insatsu Kabushiki Kaisha Device and method for controlling the concentration of aqueous solution of alcohol

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5368817A (en) * 1992-07-08 1994-11-29 Toppan Printing, Co., Ltd. Dampening water controller
EP1310361A2 (en) 2001-11-10 2003-05-14 MAN Roland Druckmaschinen AG Device for preparing fountain solution
DE10159159A1 (en) * 2001-12-01 2003-06-18 Technotrans Ag Dosing device for an offset print machine, is used to control the precise adjustment of water, alcohol and additive mixtures with proportional output pumps used in the additive lines so that additional flowmeters are not needed
DE10159159B4 (en) * 2001-12-01 2006-10-12 Technotrans Ag Dosing device for dampening solution preparation on printing machines
DE102008045421A1 (en) 2008-09-02 2010-03-04 Technotrans Ag Car wash for printing presses

Also Published As

Publication number Publication date
DE69010342T2 (en) 1994-12-22
ATE108134T1 (en) 1994-07-15
FR2641733A1 (en) 1990-07-20
DE69010342D1 (en) 1994-08-11
EP0378497A1 (en) 1990-07-18
FR2641733B1 (en) 1993-12-24

Similar Documents

Publication Publication Date Title
EP0378497B1 (en) Device for controlling and regulating the damping solution in an offset-printing system
CA2308777A1 (en) Method and apparatus for measurement and automatic control of acid concentration
EP0881555A1 (en) Method for regulating the oxygen concentration of the water in the outlet of a device for dissolving oxygen in water and device for applying such a method
EP1731590A2 (en) Additive for a device for automatic supply of means forming an additive into a motor vehicle fuel tank.
US2630249A (en) Liquid fertilizer feeder for irrigation systems
FR3074297A1 (en) SYSTEM AND METHOD FOR MEASURING EROSION OF A SOIL
FR2718038A1 (en) Device for injecting and dosing a product in a water pipe for the fight against fire.
FR2800875A1 (en) METHOD AND DEVICE FOR DETERMINING THE THRESHOLD FOR DEPOSIT OF HEAVY FRACTIONS CONTAINED IN A LIQUID HYDROCARBON FLUID
FR2366611A1 (en) DEVICE FOR ADJUSTING THE FLOW OF A LIQUID
DE69321076D1 (en) Dosing device for liquid magnesium
FR3027999A1 (en) HYDROGEN GAS SUPPLY STATION AND ASSOCIATED METHOD FOR DETERMINING THE MASS FLOW OF GASEOUS HYDROGEN WITH ACCURATE PRECISION
JPS5790114A (en) Fuel consumption measuring apparatus
FR2575899A1 (en) DEVICE FOR CLEANING MILKING PLANTS
FR2897394A1 (en) DEVICE FOR AUTOMATICALLY INTRODUCING MEANS FORMING ADDITIVE IN THE FUEL DELIVERY CIRCUIT OF A MOTOR VEHICLE
JPS5653078A (en) Ink feeder in ink jet recorder
EP0634641B1 (en) Arrangement for continuous measurement of the concentration of suspended matter in a centrifugate
US11874137B1 (en) Measurement apparatus
FR2789568A1 (en) METHOD FOR OPTIMIZING THE OPERATING CYCLE OF A WASHING HOUSEHOLD APPLIANCE AND APPARATUS USING THE SAME
FR2886649A1 (en) Additive for improving performance of e.g. diesel vehicle, has mixture of additives containing additive assisting regeneration of particles filter and engine`s operating performance and stability improving additive
FR2886647A1 (en) Additive for improving performance of diesel engine of vehicle, has mixture of additives containing additive assisting filters` regeneration, friction loss reducing additive, engine operating performance and stability improving additives
FR2597629A2 (en) Method and device for automating at press
FR2895796A1 (en) Device for extracting gas dissolved in a liquid and for measuring a total pressure of the gas, comprises a crude liquid supply conduit leads into a confined chamber contains a first reference pressure isolated from an outside
JP2007211599A (en) Lubricating oil amount detection device
RU2012064C1 (en) Device for stratifying liquid
FR3042217B1 (en) METHOD FOR MEASURING THE OIL CONSUMPTION OF A VEHICLE ENGINE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19910119

17Q First examination report despatched

Effective date: 19930330

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940706

Ref country code: AT

Effective date: 19940706

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19940706

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19940706

Ref country code: GB

Effective date: 19940706

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19940706

REF Corresponds to:

Ref document number: 108134

Country of ref document: AT

Date of ref document: 19940715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69010342

Country of ref document: DE

Date of ref document: 19940811

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19941006

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19940706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950131

Ref country code: BE

Effective date: 19950131

Ref country code: LI

Effective date: 19950131

Ref country code: CH

Effective date: 19950131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: ZANON ALAIN

Effective date: 19950131

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960319

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971001