DE202016008350U1 - Roller applicator for applying a coating composition on a structured substrate - Google Patents

Abstract

Roll applicator (1) for applying a coating composition (7) on a structured substrate (3) with an applicator roll (4), in particular a Haschuren or anilox roll, with a metering roll (5) or metering blade, with the applicator roll (4) a metering (6) for a liquid coating composition (7), in particular a paint, forms, and with a transfer roller (8) having a plastic-elastic jacket (9, 10), consisting of an inner shell shell (9) and one of the inner Sheath shell (9) enclosing outer sheath shell (10), whose material hardness is lower than that of the inner shell shell (9), and which rolls on the applicator roll (4) and on a substrate to be coated (3) or in opposite directions, characterized in that at least one of the rolls (4, 5, 8) which applies UV-curing or acid-curing lacquers, isocyanate-crosslinking lacquers or physically-drying lacquers can be tempered.

Description

The invention relates to a roll applicator for applying a coating composition on a structured substrate with an applicator roll, in particular a Haschuren- or anilox roll, with a metering roll or metering blade, which forms a metering gap for a liquid coating material, in particular a paint with the applicator roll, and with a transfer roller, which has a plastic-elastic jacket, in particular a jacket made of a rubber material and which rolls on the application roller and on a substrate to be coated or applies in opposite directions. Such a roller applicator is from the EP 0278650 B1 known. Similar arrangements also describe the EP 2251205 A2 . EP 1598185 A1 . WO 03/053643 A1 as well as the EP 2050514 B1 ,

The quality of the layer applied to the structured substrate depends strongly on the fact that the transfer roller applies the layer as completely as possible to the substrate, in particular also those parts which are located on the surface of the substrate in deeper regions of the structuring. This is often realized in the roll applicators known from the prior art in that the jacket shell of the transfer roll is formed from a particularly soft material having a hardness of less than 30 Shore A in some cases. However, these transfer rollers tend to flatten the cladding shell, thereby deteriorating the coating pattern of the coating compound applied to the substrate. To realize against mechanical stress and contamination of highly resistant surfaces paint systems are needed, which can be subjected to a crosslinking reaction after application to the substrate. These paint systems, in particular 100% UV systems, often have too high a viscosity to be able to transfer them by means of a Haschuren- or anilox roller. In order to still be able to use these coating systems for the roller application unit advantageously designed for full-surface coating of structured surfaces, it has been found that a temperature control of the roller applicator or at least one roller of the roller applicator in a range of 20 ° C to 80 ° C, especially in one area from 35 ° C to 55 ° C is advantageous.

It is therefore an object of the invention to provide a roller applicator of the type mentioned, which allows the formation of a high-quality coating on a substrate to be coated.

This object is achieved by a roller applicator with the features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

Accordingly, it is provided that the plastic-elastic jacket of the transfer roller has an inner shell shell and the inner shell shell enclosing the outer shell shell, wherein the inner shell shell has a greater material hardness than the outer shell shell.

For example, the hardness of the outer shell shell may be selected to include as effectively as possible also portions of the coating composition in low-lying structural areas of the structured substrate or bring in, while the inner shell shell has a hardness which is designed to prevent the plates from splitting off the transfer roller.

For this purpose, the hardness of the inner shell shell, for example, at least 40 Shore A, preferably at least 50 Shore A and more preferably at least or about 60 Shore A.

The hardness of the outer shell shell can be between 20 Shore A and 35 Shore A and more preferably 30 Shore A.

The thickness of the outer jacket shell in the radial direction of the transfer roll may be selected depending on the pattern depth and the geometry of the structures of the patterned substrate. The deeper the lowermost structural regions of the substrate, the thicker the outer jacket shell of the transfer roll can be formed in order to ensure the necessary elasticity for application of the coating composition into the lowest-lying regions of the substrate. If the structure of the substrate has only shallow depths, then the thickness of the outer jacket shell can be selected correspondingly lower. For example, the outer shell shell may have a thickness in the radial direction of the transfer roller of 0.5 to 10 mm, preferably 1.5 to 5 mm and particularly preferably 3 mm. For example, for the manufacture of LVTs (LVT-Luxury Vinyl Tile), the thickness of the outer jacket shell of the transfer roll in the radial direction may be about 3 mm, for example between 2.5 and 3.5 mm. Also, for the painting of embossed furniture films and synthetic leather, such a structure is preferred. However, the application method of the invention is not limited to the decorative area, but can also be used in technical areas, such as functional films or printed electronics.

In particular, a thickness of the inner shell shell in the radial direction of the transfer roller substantially greater than a thickness of the outer shell shell in the radial direction of the Be transfer roller, wherein the thickness of the inner shell shell is preferably at least twice as large and more preferably at least four times as large as the thickness of the outer shell shell.

The metering roller can likewise have a plastically elastic jacket, in particular a jacket made of a rubber material, wherein a hardness of the plastic-elastic jacket of the metering roller is between 45 and 55 parts A and particularly preferably 50 parts A. As an alternative to the metering roller, a metering blade can be provided.

The applicator roll may be a smooth roll or textured roll. In an advantageous embodiment, this is formed by a Haschuren- or anilox roller. The anilox roller can be designed in such a way that the coating composition is transferred over its entire area to the plastically elastic transfer roller or the coating material is only partially released to the transfer roller in the embodiment of an indirect printing process.

The roller applicator may further comprise a counter-pressure roller, which forms a further nip with the transfer roller through which a substrate to be coated is guided. The counterpressure roller can also have a plastic-elastic jacket, in particular a jacket made of a rubber material, wherein the hardness of the plastic-elastic jacket is between 55 and 65 Share A and particularly preferably 60 Share A. This may be advantageous in the case of thickness-fluctuating substrates. Alternatively, a steel roller can be used as a counter-pressure roller.

The outer jacket shell can be arranged directly on the inner jacket shell, so that the inner jacket shell is in contact with the outer jacket shell.

The coating composition may be a UV- or electron-radiation-curing lacquer, as used, for example, for the production of three-dimensional lacquer applications in the field of LVT production. Alternatively, but not exclusively, the coating composition may be an acid-curing lacquer (SH lacquer, melamine system), an isocyanate-crosslinking lacquer or a physically drying lacquer. The coating composition may further be colored with pigments or dyes.

At least one of the rollers of the roller applicator can be tempered. Likewise, a paint tray / mass template of the roller applicator can be tempered and / or formed as an overflow tray with paint circulation or as a chamber doctor blade. The applicator roll may be a smooth roll or a textured roll. The applicator roll may be adapted to transfer the coating composition over the entire surface or only partially to the transfer roller.

By way of example, a production line for the production of LVTs which has a roll applicator of the type described above will be described.

For the purposes of this invention, rubber materials may be, for example, terpolymeric elastomers, for example synthetic rubber materials such as EPM or EPDM (ethylene-propylene-diene; M group), but also natural rubber materials (NR) or styrene-butadiene rubber (SBR). Other elastomers which can be used for this purpose can be prepared on the basis of nitrile, polyurethane, silicone or fluoroelastomers. Likewise, rubber materials of compact or foamed material can be used.

Further details of the invention will be explained with reference to the following figures. Showing:

1 a schematic cross section perpendicular to the longitudinal axis of a transfer roller according to an embodiment of the invention; and

2 a schematic representation of a production line with an exemplary roller coater using the transfer roller according to 1 ,

In the 1 shown transfer roller 8th is about a rotation axis 16 which is perpendicular to the plane of the drawing, rotatable, being about the axis of rotation 16 a steel core 15 the transfer roller 8th is arranged. On the steel core 15 is a plastic-elastic shell, consisting of an inner shell shell 9 and an outer jacket shell 10 , mounted, for example, vulcanized. The outer jacket shell 10 is directly on the outer circumference of the inner shell shell 9 applied, for example, vulcanized.

The inner and the outer jacket shell 9 . 10 are formed of a rubber material, the use of rubber materials, such as terpolymeric elastomers, being generally known for the formation of transfer roll shells and other rolls in prior art roll coating units. Deviating from the prior art, the jacket shell 9 . 10 but in two parts with an inner and an outer shell shell 9 . 10 executed, wherein the inner shell shell 9 a higher Shore hardness than the outer shell shell 10 having. In the present case, the inner shell shell 9 a hardness of about 60 Shore A and can be made of, for example, an EPDM rubber (ethylene-propylene-diene). The outer jacket shell 10 is formed as a thin and soft Außengummierung the inner shell shell with a hardness of 20 to 30 Shore, wherein the outer shell or Außengummierung 10 made of EPDM, a thickness in the radial direction of the transfer roller 8th of about 3 mm.

The roller applicator 1 may be part of a production line, such as used in the manufacture of LVTs. An exemplary arrangement is in 2 shown. Accordingly, the Walzenauftragswerk 1 a request roll 4 on, which may be formed, for example, as a Haschuren- or anilox roller. The application roller 4 forms with a metering roller 5 a metering gap 6 for the liquid coating composition 7 , The coating mass 7 For example, it may be a UV-curable varnish. About the metering roller 5 is a uniform paint application over the entire surface of the applicator roll 4 realized.

The over the metering roller on the request roller 4 applied lacquer layer 2 is via the transfer roller 8th on a surface of a substrate 3 transfer. To do this, the transfer roller rolls 8th on the request roll 4 and on the other hand on the transfer roller 8th facing surface of the substrate 3 decreases or decreases or transfers in a counter-rotating and / or mitläufigen rotational movement the paint from the applicator roll on the substrate. To ensure a uniform contact pressure of the transfer roller 8th on the substrate 3 is a counterpressure roller 12 on the printed side of the substrate 3 arranged opposite side, wherein the counter-pressure roller 12 a shell of a plastic-elastic material having a hardness between 55 and 65 Shore A and more preferably about 60 Shore A.

After the varnish layer 2 on the substrate 3 by means of the transfer roller 8th has been applied, becomes the substrate 3 with the paint layer 2 through a UV curing system 17 directed where the still liquid paint job 2 is cured under UV irradiation. The web-shaped substrate material 3 is about a roll tensioner 19 held at a predetermined bias, with the finished substrate 3 after leaving the convection oven 18 on a take-up spool 20 is wound up for further processing.

The features of the invention disclosed in the foregoing description, in the drawing and in the claims may be essential for the realization of the invention both individually and in any desired combination.

LIST OF REFERENCE NUMBERS

1

 Roll applicator

 2

 paint layer

3

 substratum

4

 applicator roll

5

 metering

6

 metering

7

 coating

8th

 transfer roller

9

 inner jacket shell

 10

 outer jacket shell

 11

Dosierwalzenmantel

 12

 Backing roll

 13

 nip

 14

Counterpressure roll shell

 15

steel core

 16

axis of rotation

 17

 UV curing device

 18

multi-stage convection oven

 19

tensioners

 20

up reel

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0278650 B1 [0001]
• EP 2251205 A2 [0001]
• EP 1598185 A1 [0001]
• WO 03/053643 A1 [0001]
• EP 2050514 B1 [0001]

Claims (14)

Roll applicator ( 1 ) for the application of a coating composition ( 7 ) on a structured substrate ( 3 ) with an applicator roll ( 4 ), in particular a Haschuren or anilox roller, with a metering roller ( 5 ) or metering doctor, with the application roller ( 4 ) a metering gap ( 6 ) for a liquid coating composition ( 7 ), in particular a lacquer, forms, and with a transfer roller ( 8th ), which has a plastic-elastic jacket ( 9 . 10 ), consisting of an inner shell shell ( 9 ) and from an inner shell ( 9 ) enclosing outer shell shell ( 10 ), whose material hardness is lower than that of the inner shell shell ( 9 ) and that on the applicator roll ( 4 ) as well as on a substrate to be coated ( 3 ) unwinds or in opposite directions, characterized in that at least one of the rollers ( 4 . 5 . 8th ), the under UV irradiation or under the action of acid-curing lacquers, isocyanate-crosslinking lacquers or physically-drying lacquers applies, can be tempered. Roll applicator ( 1 ) according to claim 1, wherein the hardness of the inner shell shell ( 9 ) is at least 40 Shore A, preferably at least 50 Shore A and more preferably at least or about 60 Shore A. Roll applicator ( 1 ) according to claim 1 or 2, wherein the hardness of the outer shell shell is between 20 Shore A and 40 Shore A and more preferably 30 Shore A. Roll applicator ( 1 ) according to one of the preceding claims, in which the outer jacket shell ( 10 ) a thickness in the radial direction of the transfer roller ( 8th ) of 0.5 to 10 mm, preferably 1.5 to 5 mm and particularly preferably 3 mm. Roll applicator ( 1 ) according to one of the preceding claims, wherein a thickness of the inner shell shell ( 9 ) in the radial direction of the transfer roller ( 8th ) substantially larger than a thickness of the outer shell shell ( 10 ) in the radial direction of the transfer roller ( 8th ), wherein the thickness of the inner shell shell ( 9 ) preferably at least twice as large and more preferably at least four times as large as the thickness of the outer shell shell ( 10 ). Roll applicator ( 1 ) according to one of the preceding claims, in which the metering roller ( 5 ) a plastic-elastic jacket ( 11 ), in particular a jacket made of a rubber material, wherein a hardness of the plastic-elastic jacket of the metering roller ( 5 ) is between 35 and 80 Shore A and more preferably 50 Shore A. Roll applicator ( 1 ) according to one of the preceding claims, in which a counter-pressure roller ( 12 ) connected to the transfer roller ( 8th ) a nip ( 13 ), through which a substrate to be coated ( 3 ), a plastic-elastic jacket ( 14 ), in particular a jacket made of a rubber material, wherein a hardness of the plastic-elastic jacket ( 14 ) is between 35 and 80 Shore A and most preferably 60 Shore A. Roll applicator ( 1 ) according to one of the preceding claims, in which the coating composition ( 7 ) is colored by means of pigments or dyes. Roll applicator ( 1 ) according to one of the preceding claims, in which the outer jacket shell ( 10 ) directly on the inner shell shell ( 9 ) is arranged, so that the inner and the outer shell shell ( 9 . 10 ) is in contact. Roll applicator ( 1 ) according to one of the preceding claims, wherein at least one of the two layers of the transfer roller consists of a foamed elastomer. Roll applicator ( 1 ) according to one of the preceding claims, in which at least one roller ( 4 . 5 . 8th ), the paint tray / mass template of the roller applicator ( 1 ) in a range of 20 ° C to 80 ° C, in particular from 35 ° C to 55 ° C is tempered and / or the paint pan / mass template is designed as an overflow pan with paint circulation or as a chamber doctor blade. Roll applicator ( 1 ) according to one of the preceding claims, in which the applicator roll ( 4 ) is a smooth roll or a structured roll. Roll applicator ( 1 ) according to one of the preceding claims, in which the applicator roll ( 4 ) the coating mass over the entire surface or only partially on the transfer roller ( 8th ) transmits. Production line for the production of decorative or technical surfaces comprising a roll applicator ( 1 ) according to one of the preceding claims.

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