EP1516958A1 - Mixing system - Google Patents

Mixing system Download PDF

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Publication number
EP1516958A1
EP1516958A1 EP04104053A EP04104053A EP1516958A1 EP 1516958 A1 EP1516958 A1 EP 1516958A1 EP 04104053 A EP04104053 A EP 04104053A EP 04104053 A EP04104053 A EP 04104053A EP 1516958 A1 EP1516958 A1 EP 1516958A1
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EP
European Patent Office
Prior art keywords
mixing
color
line
back pressure
coated paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04104053A
Other languages
German (de)
French (fr)
Inventor
Volker Fäthke
Bernd Bohnenkamp
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.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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 Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1516958A1 publication Critical patent/EP1516958A1/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2113—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2211—Amount of delivered fluid during a period
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0468—Numerical pressure values
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus

Definitions

  • the invention relates to a mixing system, in particular for mixing a composite component coating composition according to claim 1, consisting of a mixing device with inlet and outlet pipe and the Use of the mixing system. Furthermore, the invention relates to a method for Production of coated paper or board according to claim 4, wherein a Coating color, in particular in a free-falling curtain, on a paper or Cardboard web is applied.
  • Coated pigment coating colors contain dispersed in water, mostly inorganic pigments.
  • the paint is added to the binder to the To reliably and permanently anchor pigments to the paper.
  • As another Ingredient include the coating colors thickener and various adjuvants as additives, around the required for the respective coating process chemical and adjust physical properties.
  • Such coating colors are known from WO 02/066739 A1. Furthermore is from this document a method for the production of coated paper or Cardboard in which a coating color with a so-called curtain coater in a free-falling curtain on a moving paper or board web is applied. Before the job, the finished coating color over several Mixing stages mixed from their components. Because when applying the Coating color is not allowed to contain air or other gases, it is in one Degassed intermediate process step.
  • the color additive is a thickener for Added viscosity adjustment.
  • the proportion is usually between 0.05 and 0.5 wt .-%, based on the pigment content.
  • Become a thickener For example, polymerized acrylic compounds used.
  • Viscosity adjustment it is also essential by adding surfactants the Decrease the surface tension of the coating color accordingly, so that when Apply the paint with a curtain coater that does not tear off the color curtain.
  • a mixer for the final mixing stage before application is also off the above-mentioned document described. However, practice shows that in the last mixing stage introduced color components after venting do not always mix homogeneously.
  • the invention is therefore based on the object, the mixing of a several components of composite color, especially at the last Mixing stage to improve before applying.
  • a mixing system in particular for mixing a multi-component coating paint consisting of one component Mixing device with inlet and outlet line, wherein in the drain line a Pressure control valve is arranged and the drain line upstream of the pressure control valve a bypass line with the supply line or directly on the input side with the Mixing device is connected.
  • the invention proposes the mixing of one of several components to improve composite color. It depends on the Viscosity of the color and the design of the blender a complete Homogenization of the coating color achieved.
  • this is suitable Mixing system according to the invention in multi-stage mixing units for use as the last mixing stage, at the immediately before the application of the paint, for example on paper or cardboard, other additives and hardeners are added.
  • By the Bypass is created a larger mixing room by the coating color the Passes through the mixing system several times.
  • the arranged in the drain line Pressure control valve ensures the required back pressure to the mixing effect improve.
  • a Measuring and control unit for pressure detection is integrated into the drain line.
  • the measuring and control unit for pressure determination in be integrated with the bypass line.
  • the pressure distribution in the lines is depending on the respective cable cross-section and the viscosity of the paint. Depending on Measuring location, different measuring signals are available. This opens the Possibility of a flexible and thus adapted to the respective needs constructive design of the mixing system.
  • a further aspect of the invention is a method for the production of Coated paper or cardboard, in which a coating color on a Paper or board web is applied, the coating color pigments in aqueous dispersion, binder and at least one thickener and others Contains additives, wherein first the aqueous pigment dispersion with binder is prepared and the thickener and the other additives under exclusion of air Pigment dispersion are admixed in a mixing device and then the paint is applied, the color mixture via a bypass line in the Mixture returned for further homogenization and in the Bypass line a back pressure is built up, causing the color in Depending on the pump power and the back pressure mixed.
  • a Cu rtain coater for the application of the color is especially a Cu rtain coater, in which This is applied in a free-falling curtain on paper or cardboard.
  • An advantageous embodiment of the invention provides that the back pressure between 0.5 and 5 bar.
  • the back pressure is another preferred Design between 2 - 3 bar.
  • the preferred rule ranges support the Mixing action. Depending on the color composition and the addition of additives can the back pressure is within the specified range. Outside the area If the desired mixing effect does not occur below 0.5 bar. at a pressurization above 5 bar can in conventional mixing devices the Limit of their pumping power can be achieved.
  • Mixing devices can For example, be one-or two-stage mixing turbines, consisting of a Drive motor, several mixing discs, rotors and stators are constructed. For each of the paint components is a separate feed with a metering pump provided so that the components do not come in contact before the mixing turbine.
  • the supply lines are expediently on a two-stage mixing turbine on outer circumference of the 1st rotor arranged.
  • the color only at a predetermined back pressure via a pressure control valve for application is forwarded.
  • the bypass line the pumping action of the mixing device is reduced.
  • the bypass causes a multiple circulation of the paint through the mixing device and improved by a longer residence time in the system the mixing result.
  • the coating color before mixing with the thickener and the subjected to further additives degassing be in at least a first mixing stage, the pigments in aqueous Dispersion and binder are mixed, mixed and the dispersion then degassed under vacuum before in another, the solution according to the invention corresponding thickener and more Additives are added. This is usually done under exclusion of air.
  • a preferred embodiment of the invention provides that for the production of coated paper or cardboard the color by means of a curtain coater in one freely falling curtain is applied to a running paper or board web.
  • Fig. 1 shows an inventive mixing system whose central unit is formed for example from a mixing turbine as a mixing device 1.
  • the Feed line 2 carries one out already in an earlier stage several components premixed dispersion in the mixing turbine. There kick via further feed lines 7, 9 thickener and other additives, usually below Air close, added.
  • the blended color is conveyed through the drain line 3 and occurs either through the arranged in the discharge line pressure control valve 5 or is on the Bypass line 4 returned to the mixing turbine.
  • the bypass line ends in the Inlet line 2 or leads - not shown in the figure - directly on the input side in the Mixing turbine. In this way, at least part of the finished mixed undergoes Color the mixing system several times.
  • the pressure control valve 5 controls the needed for a corresponding mixing Back pressure and the outflow of paint via the drain line 3 for application, for example, by a curtain coater, in which the paint in a free-falling Curtain is applied to a running paper or board web.
  • the arranged in the drain line pressure control valve ensures the required Back pressure to improve the mixing effect.
  • the measuring and control unit 6 determines the pressure in the drain line 3 before the pressure control valve 5 and controls the Color flow to the curtain coater and in the bypass line 4.
  • FIG. 2 an entire system is shown, in which an inventive Mixing system can be integrated.
  • the mixing system with its mixing device 1, the inlet and outlet line 2, 3 including the bypass line 4 with Pressure control valve 5 and measuring and control unit 6 is a previous one Downstream of the mixing stage.
  • the multicomponent coating color becomes extinct Pigments 10 in aqueous dispersion 11 with binder 12 in a reservoir 13 mixed.
  • a metering pump 14 the dispersion in a Degassing 15 degassed by being sprayed at low pressure. there are the gases G exiting from the dispersion, in particular it is to air, discharged from the container.
  • Another metering pump 14 conveys the Dispersion via the feed line 2 to the mixing device 1, in which as another Components thickener 7, surfactants 8 and other additives 9 under exclusion of air to be added.
  • the addition of thickener and surfactants as other additives can significantly increase the viscosity of the color mixture cause. Also in this stage, despite an increased viscosity, an additional Degassing take place.
  • plant components such as Heat exchangers or filters can be integrated into the system.
  • other pressure control units in the bypass line and / or the supply and Drain pipe be integrated in the mixing system to fine-tune the pressure distribution in the system according to the invention to a more homogeneous color mixture receive.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The pressure control valve (5) in the outlet line (3) is preceded by a upstream bypass line (4) connected to the feed line (2) or directly to the input side of the mixer (1). The coloring mixture is returned via the bypass to the mixer for further homogenization. Resultant mixing is a function of pump power and back pressure in the bypass line. A measurement controller (6) determines outlet line and bypass line pressures. Back pressures are 0.5-5 bar, preferably 2-3 bar. Back pressure controls coating. Thickener and further additives are included before mixing. A thin film curtain coater (16) applies the color in free fall, to the card or paper web. An independent claim is included for the corresponding method.

Description

Die Erfindung betrifft ein Mischsystem, insbesondere zum Mischen einer aus mehreren Komponenten zusammengesetzten Streichfarbe gemäß Anspruch 1, bestehend aus einer Mischvorrichtung mit Zulauf- und Ablaufleitung sowie die Verwendung des Mischsystems. Des Weiteren betrifft die Erfindung ein Verfahren zur Herstellung von gestrichenem Papier oder Karton gemäß Anspruch 4, bei dem eine Streichfarbe, insbesondere in einem frei fallenden Vorhang, auf eine Papier- oder Kartonbahn aufgetragen wird.The invention relates to a mixing system, in particular for mixing a composite component coating composition according to claim 1, consisting of a mixing device with inlet and outlet pipe and the Use of the mixing system. Furthermore, the invention relates to a method for Production of coated paper or board according to claim 4, wherein a Coating color, in particular in a free-falling curtain, on a paper or Cardboard web is applied.

Zur Verbesserung der Oberflächenqualität werden Naturpapiere bekannterweise mit Pigmentstreichfarben beschichtet. Die Streichfarben enthalten in Wasser dispergierte, meist anorganische Pigmente. Der Farbe wird Bindemittel zugesetzt, um die Pigmente zuverlässig und dauerhaft auf dem Papier zu verankern. Als weiteren Bestandteil enthalten die Streichfarben Verdicker und diverse Hilfsstoffe als Additive, um die für das jeweilige Beschichtungsverfahren erforderlichen chemischen und physikalischen Eigenschaften einzustellen.To improve the surface quality of natural papers are known to Coated pigment coating colors. The coating colors contain dispersed in water, mostly inorganic pigments. The paint is added to the binder to the To reliably and permanently anchor pigments to the paper. As another Ingredient include the coating colors thickener and various adjuvants as additives, around the required for the respective coating process chemical and adjust physical properties.

Derartige Streichfarben sind aus der WO 02/066739 A1 bekannt. Des Weiteren ist aus dieser Druckschrift ein Verfahren zur Herstellung von gestrichenem Papier oder Karton zu entnehmen, bei dem eine Streichfarbe mit einem so genannten Curtain-Coater in einem frei fallenden Vorhang auf eine laufende Papier- oder Kartonbahn aufgetragen wird. Vor dem Auftrag wird die fertige Streichfarbe über mehrere Mischungsstufen aus ihren Komponenten gemischt. Da beim Aufbringen die Streichfarbe keine Luft oder andere Gase enthalten darf, wird sie in einem zwischengeschalteten Verfahrensschritt entgast.Such coating colors are known from WO 02/066739 A1. Furthermore is from this document a method for the production of coated paper or Cardboard in which a coating color with a so-called curtain coater in a free-falling curtain on a moving paper or board web is applied. Before the job, the finished coating color over several Mixing stages mixed from their components. Because when applying the Coating color is not allowed to contain air or other gases, it is in one Degassed intermediate process step.

In einer letzten Mischstufe wird der Farbe als Additiv ein Verdicker zur Viskositätseinstellung hinzugegeben. Der Anteil liegt üblicherweise zwischen 0,05 und 0,5 Gew.-%, bezogen auf den Pigmentanteil. Als Verdicker werden beispielsweise polymerisierte Acrylverbindungen eingesetzt. Zur Viskositätseinstellung ist es auch wesentlich, durch eine Zugabe von Tensiden die Oberflächenspannung der Streichfarbe entsprechend herunterzusetzen, damit beim Auftragen der Farbe mit einem Curtain-Coater der Farbvorhang nicht abreißt.In a final mixing stage, the color additive is a thickener for Added viscosity adjustment. The proportion is usually between 0.05 and 0.5 wt .-%, based on the pigment content. Become a thickener For example, polymerized acrylic compounds used. to Viscosity adjustment, it is also essential by adding surfactants the Decrease the surface tension of the coating color accordingly, so that when Apply the paint with a curtain coater that does not tear off the color curtain.

Eine Mischvorrichtung für die letzte Mischstufe vor dem Auftragen ist ebenfalls aus der vorstehend genannten Druckschrift beschrieben. Die Praxis zeigt jedoch, dass sich in der letzten Mischstufe eingebrachte Farbkomponenten nach der Entlüftung nicht immer homogen vermischen lassen.A mixer for the final mixing stage before application is also off the above-mentioned document described. However, practice shows that in the last mixing stage introduced color components after venting do not always mix homogeneously.

Der Erfindung liegt daher die Aufgabe zugrunde, die Durchmischung einer aus mehreren Komponenten zusammengesetzten Farbe, insbesondere bei der letzten Mischstufe, vor dem Auftragen zu verbessern.The invention is therefore based on the object, the mixing of a several components of composite color, especially at the last Mixing stage to improve before applying.

Diese Aufgabe wird durch ein Mischsystem nach Anspruch 1 und ein Verfahren zur Herstellung von gestrichenem Papier oder Karton nach Anspruch 4 gelöst.This object is achieved by a mixing system according to claim 1 and a method for Preparation of coated paper or cardboard solved according to claim 4.

Erfindungsgemäß ist ein Mischsystem vorgesehen, insbesondere zum Mischen einer aus mehreren Komponenten zusammengesetzten Streichfarbe, bestehend aus einer Mischvorrichtung mit Zulauf- und Ablaufleitung, wobei in der Ablaufleitung ein Druckregelventil angeordnet ist und die Ablaufleitung vor dem Druckregelventil über eine Bypassleitung mit der Zulaufleitung oder direkt eingangsseitig mit der Mischvorrichtung verbunden ist.According to the invention, a mixing system is provided, in particular for mixing a multi-component coating paint consisting of one component Mixing device with inlet and outlet line, wherein in the drain line a Pressure control valve is arranged and the drain line upstream of the pressure control valve a bypass line with the supply line or directly on the input side with the Mixing device is connected.

Die Erfindung schlägt vor, die Durchmischung einer aus mehreren Komponenten zusammengesetzten Farbe zu verbessern. Dabei wird in Abhängigkeit von der Viskosität der Farbe und der Auslegung der Mischvorrichtung eine vollständige Homogenisierung der Streichfarbe erzielt. Insbesondere eignet sich das erfindungsgemäße Mischsystem bei mehrstufigen Mischeinheiten für einen Einsatz als letzte Mischstufe, bei der unmittelbar vor dem Auftragen der Farbe, beispielsweise auf Papier oder Karton, weitere Additive und Härter zugegeben werden. Durch den Bypass wird ein größerer Mischraum geschaffen, indem die Streichfarbe das Mischsystem mehrfach durchläuft. Das in der Ablaufleitung angeordnete Druckregelventil sorgt dabei für den benötigten Gegendruck, um die Mischwirkung zu verbessern.The invention proposes the mixing of one of several components to improve composite color. It depends on the Viscosity of the color and the design of the blender a complete Homogenization of the coating color achieved. In particular, this is suitable Mixing system according to the invention in multi-stage mixing units for use as the last mixing stage, at the immediately before the application of the paint, for example on paper or cardboard, other additives and hardeners are added. By the Bypass is created a larger mixing room by the coating color the Passes through the mixing system several times. The arranged in the drain line Pressure control valve ensures the required back pressure to the mixing effect improve.

Nach einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass eine Mess- und Steuereinheit zur Druckermittlung in die Ablaufleitung eingebunden ist. Hierdurch wird unter Vorgabe des Drucks im Mischsystem eine entsprechende Steuerung für den gewünschten Farbfluss gewährleistet.According to a preferred embodiment of the invention it is provided that a Measuring and control unit for pressure detection is integrated into the drain line. As a result, under the specification of the pressure in the mixing system, a corresponding Control for the desired color flow guaranteed.

Alternativ kann vorteilhafterweise die Mess- und Steuereinheit zur Druckermittlung in die Bypassleitung eingebunden sein. Die Druckverteilung in den Leitungen ist abhängig vom jeweiligen Leitungsquerschnitt und der Viskosität der Farbe. Je nach Messort stehen unterschiedliche Messsignale zur Verfügung. Dies eröffnet die Möglichkeit einer flexiblen und damit an den jeweiligen Bedarf angepassten konstruktiven Auslegung des Mischsystems.Alternatively, advantageously, the measuring and control unit for pressure determination in be integrated with the bypass line. The pressure distribution in the lines is depending on the respective cable cross-section and the viscosity of the paint. Depending on Measuring location, different measuring signals are available. This opens the Possibility of a flexible and thus adapted to the respective needs constructive design of the mixing system.

Nach einem weiteren Aspekt der Erfindung ist ein Verfahren zur Herstellung von gestrichenem Papier oder Karton vorgeschlagen, bei dem eine Streichfarbe auf eine Papier- oder Kartonbahn aufgetragen wird, wobei die Streichfarbe Pigmente in wässriger Dispersion, Bindemittel und zumindest einen Verdicker und weitere Additive enthält, wobei zunächst die wässrige Pigment-Dispersion mit Bindemittel hergestellt wird und der Verdicker und die weiteren Additive unter Luftabschluss der Pigment-Dispersion in einer Mischvorrichtung zugemischt werden und anschließend die Farbe aufgetragen wird, wobei die Farbmischung über eine Bypassleitung in die Mischvorrichtung zur weiteren Homogenisierung zurückgeführt und in der Bypassleitung ein Gegendruck aufgebaut wird, wodurch sich die Farbe in Abhängigkeit von der Pumpleistung und dem Gegendruck durchmischt.According to a further aspect of the invention is a method for the production of Coated paper or cardboard, in which a coating color on a Paper or board web is applied, the coating color pigments in aqueous dispersion, binder and at least one thickener and others Contains additives, wherein first the aqueous pigment dispersion with binder is prepared and the thickener and the other additives under exclusion of air Pigment dispersion are admixed in a mixing device and then the paint is applied, the color mixture via a bypass line in the Mixture returned for further homogenization and in the Bypass line a back pressure is built up, causing the color in Depending on the pump power and the back pressure mixed.

Für das Auftragen der Farbe eignet sich insbesondere ein Cu rtain-Coater, bei dem diese in einem frei fallenden Vorhang auf Papier oder Karton aufgetragen wird. For the application of the color is especially a Cu rtain coater, in which This is applied in a free-falling curtain on paper or cardboard.

Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, dass der Gegendruck zwischen 0,5 - 5 bar liegt. Der Gegendruck liegt nach einer weiteren bevorzugten Ausgestaltung zwischen 2 - 3 bar. Die bevorzugten Regelbereiche unterstützen die Mischwirkung. Je nach Farbzusammensetzung und der Zugabe von Additiven kann sich der Gegendruck im angegebenen Bereich bewegen. Außerhalb des Bereiches stellt sich die gewünschte Mischwirkung unter 0,5 bar nicht entsprechend ein. Bei einer Druckbeaufschlagung über 5 bar kann bei üblichen Mischvorrichtungen die Grenze ihrer Pumpleistung erreicht werden. Mischvorrichtungen können beispielsweise ein- oder zweistufige Mischturbinen sein, die aus einem Antriebsmotor, mehreren Mischscheiben, Rotoren und Statoren aufgebaut sind. Für jede der Farbkomponenten ist eine separate Zuführung mit einer Dosierpumpe vorgesehen, damit die Komponenten nicht vor der Mischturbine in Kontakt kommen. Die Zulaufleitungen sind bei einer zweistufigen Mischturbine zweckmäßigerweise am äußeren Umfang des 1. Rotors angeordnet.An advantageous embodiment of the invention provides that the back pressure between 0.5 and 5 bar. The back pressure is another preferred Design between 2 - 3 bar. The preferred rule ranges support the Mixing action. Depending on the color composition and the addition of additives can the back pressure is within the specified range. Outside the area If the desired mixing effect does not occur below 0.5 bar. at a pressurization above 5 bar can in conventional mixing devices the Limit of their pumping power can be achieved. Mixing devices can For example, be one-or two-stage mixing turbines, consisting of a Drive motor, several mixing discs, rotors and stators are constructed. For each of the paint components is a separate feed with a metering pump provided so that the components do not come in contact before the mixing turbine. The supply lines are expediently on a two-stage mixing turbine on outer circumference of the 1st rotor arranged.

Gemäß einer besonders vorteilhaften und daher bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Farbe erst bei einem vorgegebenen Gegendruck über ein Druckregelventil zum Auftragen weitergeleitet wird. Durch die Bypassleitung wird die Pumpwirkung der Mischvorrichtung reduziert. Gleichzeitig bewirkt der Bypass ein mehrfaches Umlaufen der Farbe durch die Mischvorrichtung und verbessert durch eine längere Verweilzeit im System das Mischergebnis.According to a particularly advantageous and therefore preferred embodiment of Invention is provided that the color only at a predetermined back pressure via a pressure control valve for application is forwarded. Through the bypass line the pumping action of the mixing device is reduced. At the same time the bypass causes a multiple circulation of the paint through the mixing device and improved by a longer residence time in the system the mixing result.

Vorteilhafterweise wird die Streichfarbe vor dem Mischen mit dem Verdicker und den weiteren Additiven einer Entgasung unterzogen. Mehrkomponentige Streichfarben werden in zumindest einer ersten Mischstufe, bei der Pigmente in wässriger Dispersion und Bindemittel vermengt werden, gemischt und die Dispersion anschließend unter Vakuum entgast, bevor in einem weiteren, der erfindungsgemäßen Lösung entsprechenden Mischsystem Verdicker und weitere Additive beigemengt werden. Dies erfolgt üblicherweise unter Luftabschluss. Advantageously, the coating color before mixing with the thickener and the subjected to further additives degassing. Multi-component coating colors be in at least a first mixing stage, the pigments in aqueous Dispersion and binder are mixed, mixed and the dispersion then degassed under vacuum before in another, the solution according to the invention corresponding thickener and more Additives are added. This is usually done under exclusion of air.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass zur Herstellung von gestrichenem Papier oder Karton die Farbe mittels eines Curtain-Coaters in einem frei fallenden Vorhang auf eine laufende Papier- oder Kartonbahn aufgetragen wird.A preferred embodiment of the invention provides that for the production of coated paper or cardboard the color by means of a curtain coater in one freely falling curtain is applied to a running paper or board web.

Vorteilhafterweise liegt die Verwendung einer erfindungsgemäßen Mischvorrichtung in der Anwendung des erfindungsgemäßen Verfahrens zur Herstellung von gestrichenem Papier oder Karton.Advantageously, the use of a mixing device according to the invention in the application of the inventive method for the preparation of coated paper or cardboard.

Weitere Vorteile, Besonderheiten und zweckmäßige Weiterbildungen der Erfindung ergeben sich aus den weiteren Unteransprüchen oder deren Unterkombinationen.Further advantages, special features and expedient developments of the invention emerge from the other dependent claims or their sub-combinations.

Nachfolgend wird die Erfindung anhand der Zeichnungen weiter erläutert. Im Einzelnen zeigt die schematische Darstellung in:

Fig. 1
eine Ansicht eines erfindungsgemäßen Mischsystems mit Bypassleitung und Mess- und Steuereinheit,
Fig. 2
eine schematische Darstellung einer gesamten Anlage, bei der ein erfindungsgemäßes Mischsystem integriert ist.
The invention will be further explained with reference to the drawings. In detail, the schematic representation in:
Fig. 1
a view of a mixing system according to the invention with bypass line and measuring and control unit,
Fig. 2
a schematic representation of an entire system in which a mixing system according to the invention is integrated.

Die in den Figuren gleichen Bezugsziffern bezeichnen gleiche oder gleich wirkende Elemente.The same reference numerals in the figures designate the same or the same effect Elements.

Fig. 1 zeigt ein erfindungsgemäßes Mischsystem, dessen zentrale Einheit beispielsweise aus einer Mischturbine als Mischvorrichtung 1 gebildet wird. Die Zulaufleitung 2 befördert eine bereits in einem vorhergehenden Stadium aus mehreren Komponenten vorgemischten Dispersion in die Mischturbine. Dort treten über weitere Zulaufleitungen 7, 9 Verdicker und weitere Additive, üblicherweise unter Luftabschluss, hinzu.Fig. 1 shows an inventive mixing system whose central unit is formed for example from a mixing turbine as a mixing device 1. The Feed line 2 carries one out already in an earlier stage several components premixed dispersion in the mixing turbine. There kick via further feed lines 7, 9 thickener and other additives, usually below Air close, added.

Die vermengte Farbe wird über die Ablaufleitung 3 weiterbefördert und tritt entweder durch das in der Ablaufleitung angeordnete Druckregelventil 5 oder wird über die Bypassleitung 4 zur Mischturbine zurückgeführt. Die Bypassleitung endet in der Zulaufleitung 2 oder führt - in der Figur nicht dargestellt - direkt eingangsseitig in die Mischturbine. Auf diese Weise durchläuft zumindest ein Teil der fertig gemischten Farbe das Mischsystem mehrfach.The blended color is conveyed through the drain line 3 and occurs either through the arranged in the discharge line pressure control valve 5 or is on the Bypass line 4 returned to the mixing turbine. The bypass line ends in the Inlet line 2 or leads - not shown in the figure - directly on the input side in the Mixing turbine. In this way, at least part of the finished mixed undergoes Color the mixing system several times.

Das Druckregelventil 5 regelt den für eine entsprechende Durchmischung benötigten Gegendruck und den Abfluss der Farbe über die Ablaufleitung 3 zum Auftragen, beispielsweise durch einen Curtain-Coater, bei dem die Farbe in einem frei fallenden Vorhang auf eine laufende Papier- oder Kartonbahn aufgetragen wird.The pressure control valve 5 controls the needed for a corresponding mixing Back pressure and the outflow of paint via the drain line 3 for application, for example, by a curtain coater, in which the paint in a free-falling Curtain is applied to a running paper or board web.

Das in der Ablaufleitung angeordnete Druckregelventil sorgt dabei für den benötigten Gegendruck, um die Mischwirkung zu verbessern. Die Mess- und Steuereinheit 6 ermittelt den Druck in der Ablaufleitung 3 vor dem Druckregelventil 5 und steuert den Farbfluss zum Curtain-Coater und in der Bypassleitung 4.The arranged in the drain line pressure control valve ensures the required Back pressure to improve the mixing effect. The measuring and control unit 6 determines the pressure in the drain line 3 before the pressure control valve 5 and controls the Color flow to the curtain coater and in the bypass line 4.

In Fig. 2 ist eine gesamte Anlage dargestellt, in die ein erfindungsgemäßes Mischsystem integriert werden kann. Das Mischsystem mit seiner Mischvorrichtung 1, der Zulauf- und Ablaufleitung 2, 3 einschließlich der Bypassleitung 4 mit Druckregelventil 5 und Mess- und Steuereinheit 6 ist dabei einer vorhergehenden Mischstufe nachgeschaltet.In Fig. 2, an entire system is shown, in which an inventive Mixing system can be integrated. The mixing system with its mixing device 1, the inlet and outlet line 2, 3 including the bypass line 4 with Pressure control valve 5 and measuring and control unit 6 is a previous one Downstream of the mixing stage.

In der vorhergehenden Mischstufe wird die mehrkomponentige Streichfarbe aus Pigmenten 10 in wässriger Dispersion 11 mit Bindemittel 12 in einem Vorratsbehälter 13 vermengt. Über eine Dosierpumpe 14 wird die Dispersion in einer Entgasungsvorrichtung 15 entgast, indem sie bei Unterdruck versprüht wird. Dabei werden die aus der Dispersion austretenden Gase G, insbesondere handelt es sich um Luft, aus dem Behälter abgeführt. Eine weitere Dosierpumpe 14 befördert die Dispersion über die Zulaufleitung 2 zur Mischvorrichtung 1, in der als weitere Komponenten Verdicker 7, Tenside 8 und weitere Additive 9 unter Luftabschluss hinzugefügt werden. Insbesondere die Zugabe von Verdicker und Tensiden als weitere Additive kann eine beträchtliche Zunahme der Viskosität der Farbmischung bewirken. Auch in dieser Stufe kann trotz einer erhöhten Viskosität eine zusätzliche Entgasung stattfinden.In the preceding mixing stage, the multicomponent coating color becomes extinct Pigments 10 in aqueous dispersion 11 with binder 12 in a reservoir 13 mixed. About a metering pump 14, the dispersion in a Degassing 15 degassed by being sprayed at low pressure. there are the gases G exiting from the dispersion, in particular it is to air, discharged from the container. Another metering pump 14 conveys the Dispersion via the feed line 2 to the mixing device 1, in which as another Components thickener 7, surfactants 8 and other additives 9 under exclusion of air to be added. In particular, the addition of thickener and surfactants as other additives can significantly increase the viscosity of the color mixture cause. Also in this stage, despite an increased viscosity, an additional Degassing take place.

Dem erfindungsgemäßen Mischsystem nachgeschaltet ist ein über die Ablaufleitung 3 mit Streichfarbe versorgter Curtain-Coater 16.Downstream of the mixing system according to the invention is via the drain line. 3 curtain coater supplied with coating color 16.

Weitere, nicht in den Figuren dargestellte Anlagenkomponenten, wie beispielsweise Wärmetauscher oder Filter, können in die Anlage eingebunden werden. Ebenso können auch weitere Druckregeleinheiten in der Bypassleitung und/oder der Zu- und Ablaufleitung im Mischsystem eingebunden werden, um durch eine Feinabstimmung der Druckverteilung im System erfindungsgemäß eine homogenere Farbmischung zu erhalten. Further, not shown in the figures plant components, such as Heat exchangers or filters can be integrated into the system. As well can also other pressure control units in the bypass line and / or the supply and Drain pipe be integrated in the mixing system to fine-tune the pressure distribution in the system according to the invention to a more homogeneous color mixture receive.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Mischvorrichtungmixing device
22
Zulaufleitungsupply line
33
Ablaufleitungdrain line
44
Bypassleitung oder RückführleitungBypass line or return line
55
DruckregelventilPressure control valve
66
Mess- und SteuereinheitMeasuring and control unit
77
Zulaufleitung VerdickerFeed line thickener
88th
Zulaufleitung TensidFeed line surfactant
99
Zulaufleitung weitere HilfsstoffeInlet line other auxiliaries
1010
Pigmentepigments
1111
Wasserwater
1212
Bindemittelbinder
1313
Vorratsbehälterreservoir
1414
Dosierpumpemetering
1515
Entgasungsvorrichtungdegassing
1616
Curtain-CoaterCurtain coater
GG
Gasgas

Claims (10)

Mischsystem, insbesondere zum Mischen einer aus mehreren Komponenten zusammengesetzten Streichfarbe, bestehend aus einer Mischvorrichtung (1) mit Zulauf- (2) und Ablaufleitung (3),
dadurch gekennzeichnet, dass in der Ablaufleitung (3) ein Druckregelventil (5) angeordnet ist und die Ablaufleitung (3) vor dem Druckregelventil (5) über eine Bypassleitung (4) mit der Zulaufleitung (2) oder direkt eingangsseitig mit der Mischvorrichtung (1) verbunden ist.Mixing system, in particular for mixing a coating composition composed of a plurality of components, consisting of a mixing device (1) with feed (2) and discharge line (3),
characterized in that in the discharge line (3) a pressure control valve (5) is arranged and the drain line (3) upstream of the pressure control valve (5) via a bypass line (4) with the feed line (2) or directly on the input side with the mixing device (1) connected is. Mischsystem nach Anspruch 1,
dadurch gekennzeichnet, dass eine Mess- und Steuereinheit (6) zur Druckermittlung in die Ablaufleitung (3) eingebunden ist.Mixing system according to claim 1,
characterized in that a measuring and control unit (6) for detecting pressure in the drain line (3) is integrated. Mischsystem nach Anspruch 1,
dadurch gekennzeichnet, dass eine Mess- und Steuereinheit (6) zur Druckermittlung in die Bypassleitung (4) eingebunden ist.Mixing system according to claim 1,
characterized in that a measuring and control unit (6) for detecting pressure in the bypass line (4) is integrated. Verfahren zur Herstellung von gestrichenem Papier oder Karton, bei dem eine Streichfarbe, insbesondere in einem frei fallenden Vorhang, auf eine Papieroder Kartonbahn aufgetragen wird, wobei die Streichfarbe Pigmente in wässriger Dispersion (10, 11), Bindemittel (12) und zumindest einen Ver-dicker (7) und weitere Additive (8, 9) enthält, wobei zunächst die wässrige Pigment-Dispersion mit Bindemittel hergestellt wird und der Verdicker (7) und die weiteren Additive (8, 9) unter Luftabschluss der Pigment-Dispersion in einer Mischvorrichtung (1) zugemischt werden und anschließend die Farbe aufgetragen wird,
dadurch gekennzeichnet, dass die Farbmischung über eine Bypassleitung (4) in die Mischvorrichtung (1) zur weiteren Homogenisierung zurückgeführt wird und in der Bypassleitung ein Gegendruck aufgebaut wird, wodurch sich die Farbe in Abhängigkeit von der Pumpleistung und dem Gegendruck durchmischt.Process for the production of coated paper or board, in which a coating color, in particular in a free-falling curtain, is applied to a paper or board web, the coating color comprising pigments in aqueous dispersion (10, 11), binders (12) and at least one thicker (7) and further additives (8, 9), wherein first the aqueous pigment dispersion is prepared with a binder and the thickener (7) and the other additives (8, 9) with exclusion of air of the pigment dispersion in a mixing device ( 1) are added and then the color is applied,
characterized in that the color mixture via a bypass line (4) is returned to the mixing device (1) for further homogenization and in the bypass line, a back pressure is built up, whereby the color mixed depending on the pump power and the back pressure. Verfahren zur Herstellung von gestrichenem Papier oder Karton nach Anspruch 4,
dadurch gekennzeichnet, dass der Gegendruck zwischen 0,5 - 5 bar liegt.Process for the production of coated paper or cardboard according to claim 4,
characterized in that the back pressure between 0.5 - 5 bar. Verfahren zur Herstellung von gestrichenem Papier oder Karton nach Anspruch 5,
dadurch gekennzeichnet, dass der Gegendruck zwischen 2 - 3 bar liegt.Process for the production of coated paper or cardboard according to claim 5,
characterized in that the back pressure is between 2 - 3 bar. Verfahren zur Herstellung von gestrichenem Papier oder Karton nach einem der Ansprüche 4 bis 6,
dadurch gekennzeichnet, dass die Farbe erst bei einem vorgegebenen Gegendruck über ein Druckregelventil (5) zum Auftragen weitergeleitet wird.Process for producing coated paper or board according to one of Claims 4 to 6,
characterized in that the color is forwarded to apply only at a predetermined back pressure via a pressure control valve (5). Verfahren zur Herstellung von gestrichenem Papier oder Karton nach einem der Ansprüche 4 bis 7,
dadurch gekennzeichnet, dass die Streichfarbe vor dem Mischen mit dem Verdicker (7) und den weiteren Additiven einer Entgasung unterzogen wird. Process for producing coated paper or board according to one of claims 4 to 7,
characterized in that the coating color is subjected to degassing before mixing with the thickener (7) and the other additives. Verfahren zur Herstellung von gestrichenem Papier oder Karton nach einem der Ansprüche 4 bis 8,
dadurch gekennzeichnet, dass mittels eines Curtain-Coaters (16) in einem frei fallenden Vorhang die Farbe auf eine laufende Papier- oder Kartonbahn aufgetragen wird.Process for producing coated paper or board according to one of claims 4 to 8,
characterized in that by means of a curtain coater (16) in a free-falling curtain, the color is applied to a running paper or board web. Verwendung einer Mischvorrichtung nach einem der Ansprüche 1 bis 3 zur Anwendung des Verfahrens nach einem der Ansprüche 4 bis 9.Use of a mixing device according to one of claims 1 to 3 for Application of the method according to one of claims 4 to 9.
EP04104053A 2003-09-16 2004-08-24 Mixing system Withdrawn EP1516958A1 (en)

Applications Claiming Priority (2)

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DE10343023A DE10343023A1 (en) 2003-09-16 2003-09-16 Mixing system for color components and process for the production of coated paper or cardboard

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CN109126618A (en) * 2018-09-25 2019-01-04 宁陕纤纤魔芋生物科技有限公司 A kind of food stirring device

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