DE10343022A1 - Continuous coating color preparation - Google Patents

Abstract

The invention relates to an apparatus for coating color preparation (1) of a coating composition composed of a plurality of components, at least consisting of a first mixing stage (2) and a degassing device (3), wherein at least one continuous mixing unit (21) for mixing the coating composition components before the first mixing stage Degassing device (3) is arranged. Furthermore, the invention relates to a process for the production of coating color with a first mixing stage, a degassing, at least a second mixing stage, wherein the coating color pigments in aqueous dispersion, binder and at least one thickener and other additives, and wherein DOLLAR A - using at least one continuous mixing unit (21) as the first mixing stage (2) an aqueous pigment dispersion with binder and other additives is prepared, and DOLLAR A - is subsequently subjected to the dispersion of a degassing.

Description

The The invention relates to a device for coating color preparation a coating composition composed of a plurality of components according to claim 1, consisting of a first mixing stage, a degassing device and at least a second mixing stage. Furthermore, the concerns Invention a method for the production of coating color according to claim 7, wherein the coating color pigments in aqueous dispersion, binder and at least one thickener and other additives as well a process for the production of coated paper or cardboard according to claim 12th

to Improvement of the surface quality Natural papers are known to be coated with pigment coating colors. The coating colors contain water-dispersed, mostly inorganic Pigments. The paint is added to the pigment binders reliable and permanently on the paper. As another ingredient the coating colors contain thickeners and various additives as additives, around the for the respective coating process required chemical and adjust physical properties.

trend the coating color processing is available to flexible processes while introducing higher solids contents in emulsion paints. A higher one Solids content requires that when sizing the mixer the dispersing and mixing behavior of the individual color components special Attention is paid. By making the entire process sequence more flexible to achieve faster grade changes and smaller wastewater volumes.

In the publication Puijola, Metso Paper Finishing Days, Oct. 2002, Strasbourg the modular and the continuous color preparation as two for the practice described essential treatment techniques. The widespread Modular processing is based on a process in which the paint is batchwise is processed and thereby the overall process of different Composed of sub-processes. For each subprocess, the dosing order becomes the chemicals are selected that the chemicals that do not react with each other at the same time be dosed.

at Batch-operated color processing becomes comparatively much Air entered in the paint. This is especially special when curtain painting unfavorable. Furthermore requires a discontinuous preparation intermediate tank, in which again cause accumulation of air or paint deposits can, the for the subsequent coating processes are disadvantageous. In the continuous Coating preparation controls a complex system control the mixing and dosing system for the individual chemicals that are mixed in directly into the Machine container one Coating device introduced or in certain cases in storage containers be stored.

Of Further are coating colors and their processing from the publication WO 02/066739 A1 discloses. Also, the document is a method for Manufacture of coated paper or paperboard the one coating color with a so-called curtain coater in one freely falling curtain applied to a running paper or board web becomes. Before the job, the finished coating color over several Mixing stages mixed from their components. Because when applying the coating color may not contain air or other gases she is degassed in an intermediate process step.

Of the Invention is the object of the color preparation by to make a suitable coordination of individual process flows more flexible and thereby the overall process sequence regarding improve their profitability and quality.

These Task is by a device for coating color preparation according to claim 1 and a method for the production of coating color after Claim 7 and by a process for the preparation of coated Paper or cardboard solved according to claim 12.

According to the invention is a Apparatus for coating color preparation one of several components provided composite coating paint, at least consisting of a first mixing stage and a degassing device, wherein as the first Mixing at least one continuous mixing unit for mixing the coating color components is arranged in front of the degassing device.

The invention proposes to introduce smaller amounts of gas into the color mixture by continuous mixing units than in conventional methods. In this case, depending on the viscosity of the color and the design of the mixing device, a complete homogenization of the coating color is achieved, the coating color losses are kept low and a quick color change is made possible by a small amount of stock in the mixing system. The paint passes through the treatment device and passes without stocking directly into the machine container of the coating device. A measurement and control unit ensures the necessary coordination of the individual processes with each other to coordinate the color flow, and ensures an economically advantageous, high system integration and production performance. The inventor The device for color preparation according to the invention requires only a small storage of coating color or its components.

To A preferred embodiment of the invention provides that at least one further continuous mixing unit after the degassing device arranged to admix other color components. hereby is the separate admixture of various components and their Dosing order adapted to the respective chemicals, wherein preferably those components are dosed simultaneously, the do not react with each other.

advantageously, The degassing device is a vacuum ventilator, which is always in a certain amount Air present in the coating color is removed.

advantageously, a mixing turbine is arranged at least after a mixing unit, to the mixing of the composite of several components To improve color. Optionally followed by a cooling device. As a result, by the mixing process in a mixing turbine heated Color cooled, for efficient ventilation or further processing or to avoid cooking in the vacuum fan.

In a further advantageous embodiment of the invention is at least a filter, preferably at the output end, into the device involved. This will be at least immediately before application the color of the impurities contained in it, for example Particles and deposits of coating color, removed.

In preferred embodiment For example, the curtain coating machine is a curtain coater arranged according to, optionally with a pulsation damper. The pulsation damper reduces the Pressure surges in the mixing system and takes care of a uniform color flow in the coater.

To Another aspect of the invention is a method of manufacture of coating paint with a first mixing stage, a degassing device, specified at least a second mixing stage, wherein the coating color Pigments in aqueous dispersion, Containing binder and at least one thickener and other additives, wherein using at least one continuous mixing unit as the first mixing stage an aqueous Pigment dispersion prepared with binder and other additives and then subjected to the dispersion of a degassing becomes. Advantageously, the degassing is carried out under vacuum.

A advantageous embodiment of the invention provides that using at least one continuous mixing unit as a second mixing stage Thickener and other additives with exclusion of air of the pigment dispersion be mixed. Advantageously, as further additives surfactants uses.

According to one particularly advantageous and therefore preferred embodiment of Invention is provided that before applying the paint at least once filtered.

Of Furthermore, the invention provides that for the production of painted Paper or board the color using the device according to the invention for coating color preparation by means of a curtain coater in one freely falling curtain on a moving paper or board web is applied.

Further Advantages, special features and expedient developments of the invention emerge from the other dependent claims or their sub-combinations.

following the invention will be further explained with reference to the drawings. in the Individual shows the schematic representation in:

1 a schematic representation of a device for coating color preparation with a coater, in which a mixing turbine is integrated before the degassing.

2 a schematic representation of a device for coating color preparation with a coater, each with a mixing stage before and after the degassing.

3 a schematic representation of a device for coating color preparation with a coater, in which a mixing turbine is integrated with a subsequent intermediate container before the degassing.

4 a schematic representation of a device for coating color preparation with a coater with an intermediate container before and a mixing stage after the degassing.

5 a schematic representation of a device for coating color preparation with a coater, each with a continuous mixing stage with additional mixing turbine before and after the degassing.

The like numerals in the figure designate the same or the same acting elements.

1 schematically shows a device according to the invention for coating color preparation 1 , In a first mixing stage 2 become via supply lines pigments 22 , Water 23 and binders 24 and as further components thickener 42 and other additives 43 added. About a continuous mixing unit 21 the components are mixed. After the mixing process, the dispersion passes through an additional mixing turbine with a cooling device 25 to homogenize the color and reduce the temperature rising due to the mixing process.

The cooled dispersion is by means of a pump 8th a degassing device 3 fed, in which it is sprayed at low pressure. In this case, the gases emerging from the color mixture, in particular air, are removed from the container.

After degassing, the ready-mixed paint with a pump 8th forwarded and via a filter 5 and a pulsation damper 6 a curtain coater 9 over which the coating is applied to paper or cardboard.

2 shows a schematic representation of a device for coating color preparation with a coater, each with a mixing stage before and after the degassing. In the first mixing stage 2 is using a continuous mixing unit 21 prepared an aqueous pigment dispersion with binder and other additives. Subsequently, the dispersion is subjected to degassing, in a second mixing stage 4 Then thickeners and other additives are added and again via filters 5 and a pulsation damper 6 a coater 9 fed. In a two-stage mixing process, the components are first mixed, which can be vented well due to a low viscosity. Substances which increase the viscosity or tend to foam are added at a later stage of the process.

3 shows a schematic representation of a device for coating color preparation analogous to 1 with a coater, using a mixing turbine 25 with a subsequent intermediate container 7 before the degassing device 3 is involved.

Also, as in 4 shown, the intermediate container immediately after the continuous mixing unit 21 be arranged and after the degassing 3 a second mixing stage 4 consequences.

5 shows a schematic representation of a device for coating color preparation with a coater, each with a continuous mixing stage 21 and 41 with additional mixing turbine 25 and 44 both before and after the degassing device 3 , This causes a particularly homogeneous mixing of the color.

Especially the addition of thickener and surfactants as further additives can a considerable increase the viscosity cause the color mixture, which in turn to a considerable temperature increase in the respective mixing stage can. By a combination of a mixing turbine with another cooler In turn, the temperature of the finished mixed color is reduced, to ensure optimal processing. Also in this Level can be increased despite an increase Viscosity still an additional Degassing take place.

In the further course is a particle filter 5 arranged that removes interfering particles from the paint before these continuously form a curtain coater 9 is supplied.

Not in the figure shown measuring and control units provide for a regular Sequence of the process sequence. On demand can also be more continuous Mixing units for separate admixture of other components and in particular the continuous admixture in the second mixing stage be integrated into the device.

1

contraption for coating color preparation

2

first mixer

21

continuous mixing unit

22

supply line pigments

23

supply line water

24

supply line binder

25

mixing turbine (with cooling device)

3

degassing

4

second mixer

41

continuous mixing unit

42

supply line thickener

43

supply line other auxiliaries

44

mixing turbine (with cooling device)

5

filter

6

pulsation dampers

7

intermediate container

8th

pump

9

Curtain coater

Claims (12)

Apparatus for coating color preparation ( 1 ) of a composite of several components coating color, at least consisting of a first mixing stage ( 2 ) and a degassing device ( 3 ), characterized in that as the first mixing stage at least one continuous Mischag gregat ( 21 ) for mixing the coating components before the degassing device ( 3 ) is arranged. Apparatus for coating color preparation according to claim 1, characterized in that at least one further continuous mixing unit ( 41 ) is arranged after the degassing to admix other color components. Apparatus for coating coating composition according to claim 1 or 2, characterized in that the degassing device ( 3 ) is a vacuum fan. Apparatus for coating color preparation according to one of claims 1 to 3, characterized in that at least after a mixing unit ( 21 . 41 ) a mixed turbine ( 25 . 44 ), optionally arranged with a downstream cooling device. Apparatus for coating color preparation according to one of claims 1 to 4, characterized in that at least one filter ( 5 ), preferably at the output end, is incorporated in the device. Apparatus for coating color preparation according to one of claims 1 to 5, characterized in that the apparatus ( 1 ) a curtain coater ( 9 ), optionally with a pulsation damper ( 6 ), is connected downstream. A process for producing a coating color comprising a first mixing stage, a degassing apparatus, at least one second mixing stage, the coating color comprising pigments in aqueous dispersion, binders and at least one thickener and further additives, characterized by the method steps: using at least one continuous mixing unit 21 ) as the first mixing stage ( 2 ) is prepared an aqueous pigment dispersion with binder and other additives, and - subsequently the dispersion is subjected to degassing. Process for the production of coating color according to claim 7, characterized in that using at least one continuous mixing unit as second mixing stage thickener and other additives with exclusion of air of the pigment dispersion be mixed. Process for the production of coating color according to claim 7 or 8, characterized in that as further additives surfactants be used. Process for the production of coating color according to one of the claims 7 to 9, characterized in that before applying the color filtered at least once. Process for the production of coating color according to one of the claims 7 to 10, characterized in that the degassing under vacuum is made. A process for producing coated paper or board according to one of claims 7 to 11 using a coating composition according to any one of claims 1 to 6, characterized in that by means of a curtain coater ( 9 ) in a free-falling curtain, the color is applied to a running paper or board web.